A rapid water purifying agent based on high ferrate for ECs

Abstract

The present application belongs to the technical field of drinking water new pollutant ECs treatment, and particularly relates to a kind of ECs rapid water purifying agent based on high ferrate, by the structural design of outer plastic fiber package wrapping rapid water purifying agent and inner plastic fiber package wrapping disinfection slow-release agent, with the effect of deep treatment of drinking water, the high ferrate in the ECs removal reagent has strong oxidizing property to most pollutants, especially combined with composite modified activated carbon can realize effective removal of ECs, at the same time, copper ion, nano iron, nano manganese oxide in composite modified activated carbon as different active sites, further improve the ECs purification capacity of activated carbon, the water purifying agent is especially suitable for rural groundwater purification use.The present application can not only be applied to the treatment process of urban waterworks, but also can efficiently and conveniently purify ECs in rural groundwater, to ensure the safety of drinking water for urban and rural residents.

Description

Technical Field

[0001] This invention belongs to the field of ECs treatment technology for new pollutants in drinking water, and specifically relates to a rapid water purification agent based on ferrates. Background Technology

[0002] While the application and production of novel synthetic compounds across various industries have benefited humanity, their complex composition makes them difficult to treat and dispose of effectively. Consequently, these compounds enter the aquatic environment through various pathways, becoming new organic pollutants (ECs). ECs enter the aquatic environment directly or indirectly through various point sources and diffusion sources. Therefore, the frequent detection of ECs in drinking water sources, due to their bioaccumulation, means that even trace amounts can pose a potential threat to ecosystems and human health.

[0003] Most urban tap water is treated using traditional drinking water treatment plant processes. Even in some remote rural areas, groundwater is often used directly as drinking water without any treatment. Therefore, there is a need to develop a fast, convenient, and easy-to-use agent for the rapid removal of ECs. Summary of the Invention

[0004] To address the aforementioned technical problems, the present invention aims to provide a rapid water purification agent for ECs based on ferrates. This water purification agent has the function of deep treatment of drinking water. The ferrates in the EC removal agent have strong oxidizing properties against most pollutants, especially when used in combination with composite modified activated carbon to effectively remove ECs. Simultaneously, copper ions, nano-iron, and nano-manganese oxide in the composite modified activated carbon serve as different active sites, further synergistically enhancing the EC purification capacity of the activated carbon. This water purification agent is particularly suitable for use in rural groundwater purification. This invention can not only be applied to the treatment processes of urban waterworks but also efficiently and conveniently purify ECs in rural groundwater, ensuring the safety of drinking water for urban and rural residents.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] This invention provides a rapid water purifier based on ferrate and ECs. The purifier comprises an outer plastic fiber package and an inner plastic fiber package. The inner plastic fiber package encapsulates a slow-release disinfectant, and the outer plastic fiber package encapsulates the rapid water purifier. The rapid water purifier includes conventional pollutant removal agents and ECs removal agents. The surface of the outer plastic fiber package is coated with a water-soluble film. The ECs removal agent, by mass percentage, consists of 20-25% ferrate, 40-45% composite modified activated carbon, 10% peroxide, 10-15% bleaching powder, and 10-15% chitosan-supported quaternary ammonium salt.

[0007] Furthermore, the preparation method of the ECs removal agent includes the following steps:

[0008] (1) Activated carbon is mixed with acid and activated to obtain pretreated activated carbon. The pretreated activated carbon is then immersed in copper salt solution, washed with water, and dried to obtain copper-loaded activated carbon.

[0009] (2) Nano iron powder and nano manganese oxide are dispersed in deionized water to prepare a mixed dispersion. Then, activated carbon loaded with copper ions is impregnated in the mixed dispersion, washed with water, and dried to obtain composite modified activated carbon.

[0010] (3) Chitosan-loaded quaternary ammonium salt is dissolved in deionized water, heated and then ferrate and peroxide are added. After stirring, the mixture is cooled, bleaching powder is added and stirred, and the mixture is discharged to obtain mixed product A. Mixed product A is mixed and stirred with composite modified activated carbon and discharged to obtain ECs removal agent.

[0011] Further, in step (1), the copper salt solution is a copper sulfate solution or a copper nitrate solution, the concentration of the copper salt solution is 6~20g / L based on copper ions, the ratio of the amount of pretreated activated carbon to copper salt solution is 1g:80-150mL, and the soaking time is 12-20 hours.

[0012] Further, in step (2), the mass ratio of the nano-iron powder, nano-manganese oxide and deionized water is 0.3~0.7:0.5~0.9:50~80, the ratio of the activated carbon loaded with copper ions to the mixed dispersion is 1g:50~100mL, and the impregnation time is 15-24 hours.

[0013] Furthermore, in step (3), the temperature for heating is 30~40℃, and the temperature for cooling is 10~20℃.

[0014] Furthermore, the pore diameter of the outer plastic fiber package is 15~25mm.

[0015] Furthermore, the pore diameter of the inner plastic fiber package is 0.2~10μm.

[0016] Furthermore, the mass ratio of the rapid water purifier to the slow-release disinfectant is 3:1.

[0017] Furthermore, the mass ratio of the conventional pollution removal agent to the ECs removal agent is 1:1.

[0018] Furthermore, the disinfectant slow-release agent, by mass percentage, consists of 30% loaded ferrate and 70% weighting sand.

[0019] Furthermore, the support for the supported ferrate is at least one of activated semi-coke, biochar, red mud, clay, and fly ash.

[0020] Furthermore, the conventional pollution removal agent, by mass percentage, consists of 25%~40% ferrate, 10%~15% powdered activated carbon, 15%~20% polyaluminum chloride, 15%~20% polyacrylamide and 20% modified bentonite.

[0021] Furthermore, the preparation method of the conventional pollution removal agent includes the following steps:

[0022] Modified bentonite is obtained by calcining bentonite. The modified bentonite is added to a ferrate aqueous solution and stirred. The mixture is filtered to obtain a filter cake. The filter cake is vacuum dried at room temperature to obtain mixed product B. Mixed product B is mixed with powdered activated carbon, polyaluminum chloride and polyacrylamide. The mixture is heated and stirred. After cooling, stirring is continued. The mixture is discharged to obtain a conventional pollution removal agent.

[0023] Furthermore, the roasting temperature is 450~600℃, and the roasting time is 3~4 hours.

[0024] Furthermore, the temperature for heating and stirring is 100~130℃, and the temperature for cooling is 10~20℃.

[0025] The beneficial effects of this application are as follows:

[0026] This invention provides a rapid water purifier based on ferrates and ECs. Through a structural design where the rapid water purifier is encapsulated in an outer layer of plastic fiber and a slow-release disinfectant is encapsulated in an inner layer of plastic fiber, it effectively treats drinking water. The ferrates in the EC removal agent exhibit strong oxidizing properties against most pollutants, and its effective removal of ECs is particularly significant when used in conjunction with composite modified activated carbon. Furthermore, the copper ions, nano-iron, and nano-manganese oxide in the composite modified activated carbon act as different active sites, further synergistically enhancing the activated carbon's EC purification capacity. This water purifier is especially suitable for use in rural groundwater purification. This invention can be applied not only to urban water treatment processes but also to the efficient and convenient purification of ECs in rural groundwater, ensuring the safety of drinking water for urban and rural residents. Detailed Implementation

[0027] The technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods, and the experimental materials used in the following embodiments are all available through conventional commercial channels.

[0029] Example 1

[0030] A rapid water purification agent based on ferrates (ECs):

[0031] The water purification agent comprises an outer layer of polyethylene fiber with a pore diameter of 20 mm and an inner layer of polyethylene fiber with a pore diameter of 8 μm. The inner layer of plastic fiber encapsulates a slow-release disinfectant, and the outer layer of plastic fiber encapsulates a rapid water purification agent. The mass ratio of the rapid water purification agent to the slow-release disinfectant is 3:1. The slow-release disinfectant, by mass percentage, consists of 30% fly ash-loaded potassium ferrate (preparation method: potassium ferrate is dissolved in deionized water at a concentration of 500 g / L. After complete dissolution, fly ash with a mass ratio of 7 times that of potassium ferrate is added. The mixture is stirred at room temperature for 15 hours to allow for an adsorption loading reaction. After the reaction, it is dried in a vacuum drying oven at 50°C until constant weight to obtain fly ash-loaded potassium ferrate) and 70% weighting sand (model G25). The rapid water purification agent comprises conventional pollution removal agents and ECs removal agents in a mass ratio of 1:1, and the surface of the outer layer of plastic fiber is coated with a polyvinyl alcohol water-soluble film.

[0032] The ECs removal agent, by mass percentage, comprises 20% potassium ferrate, 45% composite modified activated carbon, 10% calcium peroxide, 12% bleaching powder (calcium hypochlorite content 35%), and 13% chitosan-supported quaternary ammonium salt (Macklin, degree of substitution 92%). The preparation method of the ECs removal agent includes the following steps:

[0033] (1) Activated carbon (FA-300 type granular activated carbon) and hydrochloric acid solution with a volume concentration of 8% were mixed at a ratio of 1g:8mL and stirred at 100r / min for 5 hours for activation. After filtration, the activated carbon was washed with deionized water until neutral and dried at 80℃ for 20 hours to obtain pretreated activated carbon. The pretreated activated carbon was then immersed in copper nitrate solution with a copper ion concentration of 15g / L at a ratio of 1g:100mL for 15 hours. After filtration, the activated carbon was washed with deionized water until neutral and dried at 80℃ for 20 hours to obtain copper ion loaded activated carbon.

[0034] (2) Nano iron powder (particle size range 20-50nm) and nano manganese oxide (particle size range 30-70nm) were dispersed in deionized water to prepare a mixed dispersion, wherein the mass ratio of nano iron powder, nano manganese oxide and deionized water was 0.4:0.7:65. Then, activated carbon loaded with copper ions was immersed in the mixed dispersion at a dosage ratio of 1g:80mL for 18 hours. After filtration, it was washed with deionized water until neutral and dried at 80℃ for 20 hours to obtain composite modified activated carbon.

[0035] (3) According to the above proportions, the chitosan-loaded quaternary ammonium salt is dissolved in deionized water, heated to 35°C, potassium ferrate and calcium peroxide are added, stirred at 150 r / min for 20 minutes, then cooled to 15°C, bleaching powder is added, and stirred at 200 r / min until uniform. The mixture is discharged to obtain mixed product A. Mixed product A is mixed with composite modified activated carbon and stirred at 200 r / min until uniform. The mixture is discharged to obtain ECs removal agent.

[0036] The conventional pollution removal agent, by weight percentage, consists of 30% ferrate, 15% powdered activated carbon, 17% polyaluminum chloride, 18% polyacrylamide, and 20% modified bentonite. The preparation method of the conventional pollution removal agent includes the following steps:

[0037] Modified bentonite was obtained by calcining bentonite at 550℃ for 3 hours. According to the above ratio, the modified bentonite was added to a 500g / L potassium ferrate aqueous solution and stirred slowly. After stirring, the mixture was filtered to obtain a filter cake. The filter cake was vacuum dried at room temperature for 10 hours to obtain mixed product B. Mixed product B was mixed with powdered activated carbon (PAC-100), polyaluminum chloride (molecular weight 2000-3000), and polyacrylamide (model JYS1545). The mixture was heated to 120℃ and stirred at 150r / min for 2 hours. After cooling to 20℃, the mixture was stirred at 200r / min until uniform. The mixture was then discharged to obtain a conventional pollution removal agent.

[0038] Example 2

[0039] A rapid water purification agent based on ferrates (ECs):

[0040] The water purification agent comprises an outer layer of polyethylene fiber with a pore diameter of 15 mm and an inner layer of polyethylene fiber with a pore diameter of 0.5 μm. The inner layer of plastic fiber encapsulates a slow-release disinfectant, while the outer layer of plastic fiber encapsulates a rapid water purification agent. The mass ratio of the rapid water purification agent to the slow-release disinfectant is 3:1. The slow-release disinfectant, by mass percentage, consists of 30% fly ash-loaded potassium ferrate (preparation method: potassium ferrate is dissolved in deionized water at a concentration of 500 g / L. After complete dissolution, fly ash with a mass ratio of 7 times that of potassium ferrate is added. The mixture is stirred at room temperature for 15 hours to allow for an adsorption loading reaction. After the reaction, it is dried in a vacuum drying oven at 50°C until constant weight to obtain fly ash-loaded potassium ferrate) and 70% weighting sand (model G25). The rapid water purification agent comprises conventional pollution removal agents and ECs removal agents in a mass ratio of 1:1, and the surface of the outer layer of plastic fiber is coated with a polyvinyl alcohol water-soluble film.

[0041] The ECs removal agent, by mass percentage, comprises 25% potassium ferrate, 40% composite modified activated carbon, 10% calcium peroxide, 15% bleaching powder (calcium hypochlorite content 35%), and 10% chitosan-supported quaternary ammonium salt (Macklin, degree of substitution 92%). The preparation method of the ECs removal agent includes the following steps:

[0042] (1) Activated carbon (FA-300 type granular activated carbon) was mixed with hydrochloric acid solution with a volume concentration of 8% at a ratio of 1g:8mL and stirred at 100r / min for 5 hours for activation. After filtration, it was washed with deionized water until neutral and dried at 80℃ for 20 hours to obtain pretreated activated carbon. The pretreated activated carbon was then immersed in copper sulfate solution with a copper ion concentration of 19g / L at a ratio of 1g:120mL for 13 hours. After filtration, it was washed with deionized water until neutral and dried at 80℃ for 20 hours to obtain copper ion loaded activated carbon.

[0043] (2) Nano iron powder (particle size range 20-50nm) and nano manganese oxide (particle size range 30-70nm) were dispersed in deionized water to prepare a mixed dispersion, wherein the mass ratio of nano iron powder, nano manganese oxide and deionized water was 0.4:0.9:70. Then, activated carbon loaded with copper ions was immersed in the mixed dispersion at a dosage ratio of 1g:60mL for 22 hours. After filtration, it was washed with deionized water until neutral and dried at 80℃ for 20 hours to obtain composite modified activated carbon.

[0044] (3) According to the above proportions, the chitosan-loaded quaternary ammonium salt is dissolved in deionized water, heated to 40°C, potassium ferrate and calcium peroxide are added, stirred at 150 r / min for 20 minutes, cooled to 20°C, bleaching powder is added, and stirred at 200 r / min until uniform. The mixture is discharged to obtain mixed product A. Mixed product A with composite modified activated carbon is mixed and stirred at 200 r / min until uniform. The mixture is discharged to obtain ECs removal agent.

[0045] The conventional pollution removal agent, by weight percentage, consists of 40% ferrate, 10% powdered activated carbon, 15% polyaluminum chloride, 15% polyacrylamide, and 20% modified bentonite. The preparation method of the conventional pollution removal agent includes the following steps:

[0046] Modified bentonite was obtained by calcining bentonite at 600℃ for 3 hours. According to the above ratio, the modified bentonite was added to a 500g / L potassium ferrate aqueous solution and stirred slowly. After stirring, the mixture was filtered to obtain a filter cake. The filter cake was vacuum dried at room temperature for 10 hours to obtain mixed product B. Mixed product B was mixed with powdered activated carbon (PAC-100), polyaluminum chloride (molecular weight 2000-3000), and polyacrylamide (model JYS1545). The mixture was heated to 130℃ and stirred at 150r / min for 1.5 hours. After cooling to 10℃, the mixture was stirred at 200r / min until uniform. The mixture was then discharged to obtain a conventional pollution removal agent.

[0047] Example 3

[0048] A rapid water purification agent based on ferrates (ECs):

[0049] The water purification agent comprises an outer layer of polyethylene fiber with a pore diameter of 25 mm and an inner layer of polyethylene fiber with a pore diameter of 10 μm. The inner layer of plastic fiber encapsulates a slow-release disinfectant, and the outer layer of plastic fiber encapsulates a rapid water purification agent. The mass ratio of the rapid water purification agent to the slow-release disinfectant is 3:1. The slow-release disinfectant, by mass percentage, consists of 30% fly ash-loaded potassium ferrate (preparation method: potassium ferrate is dissolved in deionized water at a concentration of 500 g / L. After complete dissolution, fly ash with a mass ratio of 7 times that of potassium ferrate is added. The mixture is stirred at room temperature to allow an adsorption loading reaction to occur for 15 hours. After the reaction, the mixture is dried in a vacuum drying oven at 50°C until constant weight to obtain fly ash-loaded potassium ferrate). It also comprises 70% (model G25). The rapid water purification agent comprises conventional pollution removal agents and ECs removal agents in a mass ratio of 1:1, and the surface of the outer layer of plastic fiber is coated with a polyvinyl alcohol water-soluble film.

[0050] The ECs removal agent, by mass percentage, comprises 22% potassium ferrate, 41% composite modified activated carbon, 10% calcium peroxide, 13% bleaching powder (calcium hypochlorite content 35%), and 14% chitosan-supported quaternary ammonium salt (Macklin, degree of substitution 92%). The preparation method of the ECs removal agent includes the following steps:

[0051] (1) Mix (FA-300 type granular activated carbon) with hydrochloric acid solution with a volume concentration of 8% at a ratio of 1g:8mL and stir at 100r / min for 5 hours to activate it. After filtration, wash with deionized water until neutral and dry at 80℃ for 20 hours to obtain pretreated activated carbon. Soak the pretreated activated carbon in copper sulfate solution with a copper ion concentration of 7g / L at a ratio of 1g:150mL for 18 hours. After filtration, wash with deionized water until neutral and dry at 80℃ for 20 hours to obtain copper ion loaded activated carbon.

[0052] (2) Nano iron powder (particle size range 20-50nm) and nano manganese oxide (particle size range 30-70nm) were dispersed in deionized water to prepare a mixed dispersion, wherein the mass ratio of nano iron powder, nano manganese oxide and deionized water was 0.3:0.6:50. Then, activated carbon loaded with copper ions was immersed in the mixed dispersion at a dosage ratio of 1g:100mL for 20 hours. After filtration, it was washed with deionized water until neutral and dried at 80℃ for 20 hours to obtain composite modified activated carbon.

[0053] (3) According to the above proportions, the chitosan-loaded quaternary ammonium salt is dissolved in deionized water, heated to 38°C, potassium ferrate and calcium peroxide are added, stirred at 150 r / min for 20 minutes, cooled to 10°C, bleaching powder is added, and stirred at 200 r / min until uniform. The mixture is discharged to obtain mixed product A. Mixed product A is mixed with composite modified activated carbon and stirred at 200 r / min until uniform. The mixture is discharged to obtain ECs removal agent.

[0054] The conventional pollution removal agent, by weight percentage, comprises 28% ferrate, 15% powdered activated carbon, 18% polyaluminum chloride, 19% polyacrylamide, and 20% modified bentonite. The preparation method of the conventional pollution removal agent includes the following steps:

[0055] Modified bentonite was obtained by calcining bentonite at 450℃ for 4 hours. According to the above ratio, the modified bentonite was added to a 500g / L potassium ferrate aqueous solution and stirred slowly. After stirring, the mixture was filtered to obtain a filter cake. The filter cake was vacuum dried at room temperature for 10 hours to obtain mixed product B. Mixed product B was mixed with powdered activated carbon (PAC-100), polyaluminum chloride (molecular weight 2000-3000), and polyacrylamide (model JYS1545). The mixture was heated to 100℃ and stirred at 150r / min for 2 hours. After cooling to 10℃, the mixture was stirred at 200r / min until uniform. The mixture was then discharged to obtain a conventional pollution removal agent.

[0056] Comparative Example 1

[0057] Comparative Example 1, based on Example 1, replaces the composite modified activated carbon with copper-loaded activated carbon. Specifically, the ECs removal agent, by mass percentage, consists of 20% potassium ferrate, 45% copper-loaded activated carbon, 10% calcium peroxide, 12% bleaching powder, and 13% chitosan-loaded quaternary ammonium salt. The preparation method of the ECs removal agent includes the following steps:

[0058] (1) Activated carbon and hydrochloric acid solution with a volume concentration of 8% were mixed at a ratio of 1g:8mL and stirred at 100r / min for 5 hours for activation. After filtration, the activated carbon was washed with deionized water until neutral and dried at 80℃ for 20 hours to obtain pretreated activated carbon. The pretreated activated carbon was then immersed in copper nitrate solution with a copper ion concentration of 32g / L at a ratio of 1g:100mL for 15 hours. After filtration, the activated carbon was washed with deionized water until neutral and dried at 80℃ for 20 hours to obtain copper-loaded activated carbon.

[0059] (2) According to the above proportions, the chitosan-loaded quaternary ammonium salt is dissolved in deionized water, heated to 35°C, potassium ferrate and calcium peroxide are added, stirred at 150 r / min for 20 minutes, cooled to 15°C, bleaching powder is added, and stirred at 200 r / min until uniform. The mixture is discharged to obtain mixed product A. Mixed product A is mixed with copper-loaded activated carbon and stirred at 200 r / min until uniform. The mixture is discharged to obtain ECs removal agent.

[0060] Everything else remains the same as in Example 1.

[0061] Comparative Example 2

[0062] Comparative Example 2, based on Example 1, replaced the composite modified activated carbon with activated carbon loaded with copper ions and nano-iron. Specifically, the ECs removal agent, by mass percentage, consisted of 20% potassium ferrate, 45% activated carbon loaded with copper ions and nano-iron, 10% calcium peroxide, 12% bleaching powder, and 13% chitosan-loaded quaternary ammonium salt. The preparation method of the ECs removal agent included the following steps:

[0063] (1) Activated carbon and hydrochloric acid solution with a volume concentration of 8% were mixed at a ratio of 1g:8mL and stirred at 100r / min for 5 hours for activation. After filtration, the activated carbon was washed with deionized water until neutral and dried at 80℃ for 20 hours to obtain pretreated activated carbon. The pretreated activated carbon was then immersed in copper nitrate solution with a copper ion concentration of 15g / L at a ratio of 1g:100mL for 15 hours. After filtration, the activated carbon was washed with deionized water until neutral and dried at 80℃ for 20 hours to obtain copper-loaded activated carbon.

[0064] (2) Disperse the nano iron powder in deionized water to prepare a dispersion, wherein the mass ratio of nano iron powder to deionized water is 1.1:65. Then, the activated carbon loaded with copper ions is immersed in the dispersion at a ratio of 1g:80mL for 18 hours. After filtration, it is washed with deionized water until neutral and dried at 80℃ for 20 hours to obtain activated carbon loaded with copper ions and nano iron.

[0065] (3) According to the above proportions, the chitosan-loaded quaternary ammonium salt is dissolved in deionized water, heated to 35°C, potassium ferrate and calcium peroxide are added, stirred at 150 r / min for 20 minutes, cooled to 15°C, bleaching powder is added, and stirred at 200 r / min until uniform. The mixture is discharged to obtain mixed product A. Mixed product A is mixed with activated carbon loaded with copper ions and nano iron, and stirred at 200 r / min until uniform. The mixture is discharged to obtain ECs removal agent.

[0066] Everything else remains the same as in Example 1.

[0067] Comparative Example 3

[0068] Comparative Example 3, based on Example 1, replaced the composite modified activated carbon with activated carbon loaded with copper ions and nano-manganese oxide. Specifically, the ECs removal agent, by mass percentage, consisted of 20% potassium ferrate, 45% activated carbon loaded with copper ions and nano-manganese oxide, 10% calcium peroxide, 12% bleaching powder, and 13% chitosan-loaded quaternary ammonium salt. The preparation method of the ECs removal agent included the following steps:

[0069] (1) Activated carbon and hydrochloric acid solution with a volume concentration of 8% were mixed at a ratio of 1g:8mL and stirred at 100r / min for 5 hours for activation. After filtration, the activated carbon was washed with deionized water until neutral and dried at 80℃ for 20 hours to obtain pretreated activated carbon. The pretreated activated carbon was then immersed in copper nitrate solution with a copper ion concentration of 15g / L at a ratio of 1g:100mL for 15 hours. After filtration, the activated carbon was washed with deionized water until neutral and dried at 80℃ for 20 hours to obtain copper-loaded activated carbon.

[0070] (2) Disperse nano-manganese oxide in deionized water to prepare a dispersion, wherein the mass ratio of nano-manganese oxide to deionized water is 1.1:65. Then, the activated carbon loaded with copper ions is immersed in the mixed dispersion at a dosage ratio of 1g:80mL for 18 hours. After filtration, it is washed with deionized water until neutral and dried at 80℃ for 20 hours to obtain activated carbon loaded with copper ions and nano-manganese oxide.

[0071] (3) According to the above proportions, the chitosan-loaded quaternary ammonium salt is dissolved in deionized water, heated to 35°C, potassium ferrate and calcium peroxide are added, stirred at 150 r / min for 20 minutes, then cooled to 15°C, bleaching powder is added, and stirred at 200 r / min until uniform. The mixture is discharged to obtain mixed product A. Mixed product A is mixed with activated carbon loaded with copper ions and nano manganese oxide, and stirred at 200 r / min until uniform. The mixture is discharged to obtain ECs removal agent.

[0072] Everything else remains the same as in Example 1.

[0073] Comparative Example 4

[0074] Comparative Example 4, based on Example 1, replaced the composite modified activated carbon with activated carbon loaded with nano-iron and nano-manganese oxide. That is, the ECs removal agent, by mass percentage, consists of 20% potassium ferrate, 45% activated carbon loaded with nano-iron and nano-manganese oxide, 10% calcium peroxide, 12% bleaching powder, and 13% chitosan-loaded quaternary ammonium salt. The preparation method of the ECs removal agent includes the following steps:

[0075] (1) Nano iron powder and nano manganese oxide were dispersed in deionized water to prepare a mixed dispersion, wherein the mass ratio of nano iron powder, nano manganese oxide and deionized water was 0.9:1.2:65. Then activated carbon was soaked in the mixed dispersion at a dosage ratio of 1g:80mL for 18 hours, filtered, washed with deionized water until neutral, and dried at 80℃ for 20 hours to obtain activated carbon loaded with nano iron and nano manganese oxide.

[0076] (3) According to the above proportions, the chitosan-loaded quaternary ammonium salt is dissolved in deionized water, heated to 35°C, potassium ferrate and calcium peroxide are added, stirred at 150 r / min for 20 minutes, cooled to 15°C, bleaching powder is added, and stirred at 200 r / min until uniform. The mixture is discharged to obtain mixed product A. Mixed product A is mixed with activated carbon loaded with nano iron and nano manganese oxide, and stirred at 200 r / min until uniform. The mixture is discharged to obtain ECs removal agent.

[0077] Everything else remains the same as in Example 1.

[0078] Test Example 1

[0079] The rapid water purification effect of ECs based on ferrate prepared in Example 1 and Comparative Examples 1-4 on lake water sources was tested: 5 portions of 1L natural lake water were placed in 5 portions of 1L beakers, and 0.2μg of atrazine was dissolved in each beaker to simulate lake water sources contaminated by ECs. 10mg of the rapid water purification agent based on ferrate prepared in Example 1 and Comparative Examples 1-4 was added to each beaker. After the outer water-soluble polyvinyl alcohol film dissolved, the mixture was stirred rapidly to disperse the rapid water purification agent in the outer packaging in the water. After stirring for 5 minutes, the mixture was allowed to stand for 30 minutes, and the supernatant was taken for physicochemical index analysis.

[0080] Another 1L of natural lake water was placed in a 1L beaker, and 0.2μg of atrazine was dissolved in it to simulate a lake water source contaminated by ECs. 20mg of PAC, 20mg of PAM, and 10mg of activated carbon were added. After stirring for 5 minutes and letting stand for 30 minutes, the supernatant was collected as a control sample for physicochemical analysis. The results are shown in Table 1.

[0081] Table 1

[0082]

[0083] As can be seen from Table 1, the removal rate of turbidity and color of the lake water containing ECs after treatment with the water purification agent in Example 1 is high, and the killing effect on bacteria and algae in the lake water is also better. The removal rate of ECs atrazine can reach 98%, which is far higher than that of the conventional water treatment agents PAM, PAC and activated carbon. In addition, Comparative Examples 1 to 4 changed the three active sites on the activated carbon to one or two active sites based on Example 1, and their removal rates of atrazine were all reduced.

[0084] After the water treated as described above was sealed and stored for 15 days (without removing the water treatment agent from the sample), physicochemical indicators were analyzed, and the results are shown in Table 2:

[0085] Table 2

[0086]

[0087] Test Example 2

[0088] The rapid water purification effect of ECs based on ferrate prepared in Example 1 and Comparative Examples 1-4 on river water sources was tested: 5 portions of 1L river water were placed in 5 portions of 1L beakers, and 0.2μg of atrazine was dissolved in each beaker to simulate river water sources polluted by ECs. 10mg of the rapid water purification agent based on ferrate prepared in Example 1 and Comparative Examples 1-4 was added to each beaker. After the outer water-soluble polyvinyl alcohol film dissolved, the mixture was stirred rapidly to disperse the rapid water purification agent in the outer packaging in the water. After stirring for 5 minutes, the mixture was allowed to stand for 30 minutes, and the supernatant was taken for physicochemical index analysis.

[0089] Another 1L of river water was placed in a 1L beaker, and 0.2μg of atrazine was dissolved in it to simulate river water contaminated by ECs. 20mg of PAC, 20mg of PAM, and 10mg of activated carbon were added. After stirring for 5 minutes and standing for 30 minutes, the supernatant was collected as a control sample for physicochemical analysis. The results are shown in Table 3.

[0090] Table 3

[0091]

[0092] As shown in Table 3, the water treated with the ECs-containing river water in Example 1 exhibited high removal rates of turbidity and color, and also showed better killing effects on bacteria and algae in the water. The removal rate of ECs atrazine reached 98%, which is far higher than that of the conventional water treatment agents PAM, PAC, and activated carbon. Furthermore, in Comparative Examples 1-4, the three active sites on the activated carbon were changed to one or two active sites based on Example 1, resulting in a decrease in the removal rate of atrazine.

[0093] After the water treated as described above was sealed and stored for 15 days (without removing the water treatment agent from the sample), physicochemical indicators were analyzed, and the results are shown in Table 4:

[0094] Table 4

[0095]

[0096] Test Example 3

[0097] The rapid water purification effect of ECs based on ferrate prepared in Example 1 and Comparative Examples 1-4 on groundwater sources was tested: 5 portions of 1L groundwater were placed in 5 portions of 1L beakers, and 0.2μg of atrazine was dissolved in each beaker to simulate groundwater contaminated by ECs. 10mg of the rapid water purification agent based on ferrate prepared in Example 1 and Comparative Examples 1-4 was added. After the outer water-soluble polyvinyl alcohol film dissolved, the mixture was stirred rapidly to disperse the rapid water purification agent in the outer packaging in the water. After stirring for 5 minutes, the mixture was allowed to stand for 30 minutes, and the supernatant was taken for physicochemical index analysis.

[0098] Another 1L of groundwater was placed in a 1L beaker, and 0.2μg of atrazine was dissolved in it to simulate groundwater contaminated by ECs. 20mg of PAC, 20mg of PAM, and 10mg of activated carbon were added. After stirring for 5 minutes and standing for 30 minutes, the supernatant was collected as a control sample for physicochemical analysis. The results are shown in Table 5.

[0099] Table 5

[0100]

[0101] As shown in Table 5, the purification agent in Example 1 achieved high removal rates of turbidity and color in the groundwater containing ECs, and also demonstrated better bactericidal and algal-killing effects. The removal rate of ECs atrazine reached 98%, significantly higher than that of the conventional water treatment agents PAM and PAC. Furthermore, Comparative Examples 1-4, which modified the three active sites on the activated carbon to one or two sites based on Example 1, all showed a decrease in the removal rate of atrazine.

[0102] After the water treated as described above was sealed and stored for 15 days (without removing the water treatment agent from the sample), physicochemical indicators were analyzed, and the results are shown in Table 6:

[0103] Table 6

[0104]

[0105] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A rapid water purification agent based on ferrates (ECs), characterized in that, The water purification agent comprises an outer plastic fiber package and an inner plastic fiber package. The inner plastic fiber package encapsulates a slow-release disinfectant, and the outer plastic fiber package encapsulates a rapid water purification agent. The rapid water purification agent comprises conventional pollutant removal agents and ECs removal agents. The surface of the outer plastic fiber package is coated with a water-soluble film. The ECs removal agent, by mass percentage, consists of 20-25% ferrate, 40-45% composite modified activated carbon, 10% peroxide, 10-15% bleaching powder, and 10-15% chitosan-loaded quaternary ammonium salt. The disinfectant slow-release agent, by mass percentage, consists of 30% loaded ferrate and 70% weighting sand; The conventional pollution removal agent, by mass percentage, consists of 25%~40% ferrate, 10%~15% powdered activated carbon, 15%~20% polyaluminum chloride, 15%~20% polyacrylamide and 20% modified bentonite; The preparation method of the ECs removal agent includes the following steps: (1) Activated carbon is obtained by mixing activated carbon with acid and then activating it. The pretreated activated carbon is then impregnated in copper salt solution and washed with water to obtain copper-loaded activated carbon. (2) Nano iron powder and nano manganese oxide are dispersed in deionized water to prepare a mixed dispersion. Then, activated carbon loaded with copper ions is impregnated in the mixed dispersion, washed with water, and dried to obtain composite modified activated carbon. (3) Chitosan-loaded quaternary ammonium salt is dissolved in deionized water, heated and then ferrate and peroxide are added. After stirring, the mixture is cooled, bleaching powder is added and stirred, and the mixture is discharged to obtain mixed product A. Mixed product A is mixed and stirred with composite modified activated carbon and discharged to obtain ECs removal agent.

2. The ECs rapid water purification agent based on ferrate as described in claim 1, characterized in that, The outer plastic fiber package has a pore diameter of 15~25mm.

3. The ECs rapid water purification agent based on ferrate as described in claim 1, characterized in that, The pore diameter of the inner plastic fiber package is 0.2~10μm.

4. The ECs rapid water purification agent based on ferrate as described in claim 1, characterized in that, The mass ratio of the rapid water purifier to the slow-release disinfectant is 3:

1.

5. The ECs rapid water purification agent based on ferrate as described in claim 1, characterized in that, The mass ratio of the conventional pollution removal agent to the ECs removal agent is 1:

1.

6. The ECs rapid water purification agent based on ferrate as described in claim 1, characterized in that, The carrier for the supported ferrate is at least one of activated semi-coke, biochar, red mud, clay, and fly ash.

7. The ECs rapid water purification agent based on ferrates according to claim 1, characterized in that, The preparation method of the conventional pollution removal agent includes the following steps: Modified bentonite is obtained by calcining bentonite. The modified bentonite is added to a ferrate aqueous solution and stirred. The mixture is filtered to obtain a filter cake. The filter cake is vacuum dried at room temperature to obtain mixed product B. Mixed product B is mixed with powdered activated carbon, polyaluminum chloride and polyacrylamide. The mixture is heated and stirred. After cooling, stirring is continued. The mixture is discharged to obtain a conventional pollution removal agent.

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