Method for removing antimony from mine gushing water by using nano calcium peroxide

Abstract

The application discloses a method for removing antimony in mine gushing water by using nano calcium peroxide, and comprises the following steps: S1, preparing nano calcium peroxide; S2, antimony pollution remediation experiment; and S3, studying the influence of in-situ environmental factors of groundwater on the removal rate of antimony pollution in the water environment. In the study, nano-CaO2 is successfully synthesized, and is used as an antimony pollution remediation agent together with PFS, and is applied to the remediation of antimony pollution in mine gushing water. The nano-CaO2 and PFS jointly work to better remediate the heavy metal antimony pollution in the water body, and have a high application prospect.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of heavy metal pollution, and particularly relates to a method for removing antimony in mine adit gushing water by using nano calcium peroxide. BACKGROUND

[0002] In recent years, due to the over-exploitation and unreasonable development of natural resources by human beings, the quality of water and soil environment has been continuously declining, leading to serious environmental pollution. In particular, the mine pollution problem in China is caused by high-density and high-degree mineral exploitation for many years, resulting in solid waste such as tailings, waste rock and slag containing heavy metal pollution, and industrial wastewater and waste gas generated in the mining process. The heavy metal components in these generated waste penetrate into the soil and groundwater in the mining area, causing serious harm to the living and ecological environment of local human beings. The water environment antimony (Sb) pollution in the antimony mine concentration area of Lushi County, Henan Province is the most prominent, and the lower reaches of Wulichuan River in the county as the source of the South-to-North Water Diversion (Middle Route) project in China, the antimony pollution will enter the soil, groundwater and surface water through water circulation, which will further cause potential drinking water safety in the cities along the South-to-North Water Diversion. It is found through investigation that an important source of antimony pollution in the Wulichuan River basin is the mine adit gushing water (which is essentially still groundwater) of the antimony mine, and the mine adit gushing water and the mine area groundwater are the most seriously over-standard, with over-standard multiples of more than 10 times, and the maximum over-standard multiple reaches 510 times. Influenced by the mine gushing water and groundwater supply of the antimony pollution source, the surface water is also generally polluted, with over-standard multiples of 1-58 times.

[0003] Antimony in water bodies has serious harm to human health, has potential toxicity and carcinogenicity, and long-term existence of human beings in the Sb-polluted environment will produce a series of health risks, and a small amount of Sb will cause nausea, diarrhea, skin rash and respiratory problems. Excessive Sb will seriously affect the heart, liver and reproductive system, and even induce gene mutation. Antimony mainly exists in the form of Sb(III) and Sb(V) in natural water bodies, and the toxicity of Sb 3+ is 10 times that of Sb 5+ . The existing form of antimony in water bodies is different due to different pH values, as shown in Table 1. Figure 1 Antimony in water environment not only affects animals and plants in water bodies, but also penetrates into soil, affects surface plants and enters human body through food chain, and has potential harm to human health. Therefore, it is more practical to repair and treat the antimony pollution of water sources to protect the water safety of people.

[0004] Nano calcium peroxide (nano-CaO2) shows great potential in repairing contaminated groundwater, but nano calcium peroxide is usually used for oxidation and repair of various organic pollutants, and few studies have confirmed its potential in repairing inorganic heavy metals. SUMMARY

[0005] In order to solve the above problems, the present application provides a method for removing antimony in mine gushing water by using nano calcium oxide.

[0006] The method for removing antimony in mine gushing water by using nano calcium oxide of the present application comprises the following steps: S1. preparing nano calcium oxide; S2. antimony pollution remediation experiment; S3. studying the influence of in-situ environmental factors of groundwater on the removal rate of antimony pollution in water environment.

[0007] The method for preparing nano calcium oxide in the step S1 comprises the following steps: weighing 11.1 g of CaCl2 in a 200 mL beaker, adding 25 mL of pure water, and ultrasonicating until the CaCl2 is fully dissolved; adding 35 mL of concentrated ammonia water, slowly injecting 20 mL of 30% H2O2 into the beaker at a flow rate of 0.2 mL / min, and maintaining high-speed magnetic stirring at 500 rpm during the injection process; during the injection of H2O2, a light yellow precipitate gradually appears; centrifuging the light yellow precipitate at a speed of 15000 rpm for 30 min, and washing it with pure water twice and with ethanol more than three times; taking out the precipitate, drying it in a desiccator for 2 hours, and then grinding it in a marver grinding pot until it has no particle feeling.

[0008] The step of the antimony pollution remediation experiment in the step S2 is as follows: taking 100 mL of mine gushing water in a 250 mL conical flask, adding different doses of PFS and nano-CaO2 in sequence to obtain the best dosage ratio; under the best ratio condition, adding 0.1 mol / L NaOH solution and 0.1 mol / L H2SO4 solution to adjust different pH values to evaluate the influence of pH change on the remediation effect; the degradation experiment is carried out using a constant temperature oscillator under the conditions of T=298 K and OF=120 rpm, 1 ml of sample is taken at t=5, 10, 30, 60, 120 min, and filtered using a 0.22 µm water filter membrane, 10 ml of sample is determined, and the influence of sampling volume is ignored, and each treatment method is in triplicate.

[0009] The optimized standard conditions of the antimony pollution removal rate experiment in the water environment are as follows: taking mine gushing water sample = 100 ml, nano-CaO2 dosage = 0.05 g, PFS dosage = 0.1 g, initial pH = 8, OF = 120 rpm, and T = 298 K.

[0010] The in-situ environmental factors of groundwater in the step S3 include pH, oscillation frequency, temperature, light conditions, and groundwater chemical conditions.

[0011] The present application has the following beneficial effects:

[0012] 1.The nano-CaO2 is successfully synthesized in the research, which is used as the antimony pollution repair agent together with PFS and applied to the antimony pollution repair of mine tunnel gushing water, and the antimony pollution in water can be repaired well by the joint action of nano-CaO2 and PFS, and the method has high application prospect.

[0013] 2.Under the condition of the optimal dosing amount ratio (0.05g nano-CaO 2， 0.1g PFS), the removal rate of the mine tunnel gushing water containing about 2.8mg / L of antimony can reach 97.8%.

[0014] 3.It is proved by the experiment that the antimony removal rate can be greatly improved (from 25.3% to 97.8%) by adding appropriate PFS under the condition of a small amount of nano-CaO2, different pH, temperature, oscillation frequency and light conditions have little effect on the antimony pollution repair effect of the method, relatively, low pH value, low oscillation frequency, high temperature and no light are beneficial to the catalytic degradation of Sb, but generally, the change of these environmental factors has little effect on the repair effect, so the method can be well applied to the antimony pollution repair of mine tunnel gushing water; the removal effect of the method is greatly affected by HCO3 - in water. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is the existing form of antimony under different pH conditions of water.

[0016] Figure 2 is the material characterization result of nano calcium peroxide prepared by the application; Figure 2 A is the SEM graph of prepared nano-CaO2; Figure 2 B is the TEM graph of nano calcium peroxide; Figure 2 C and Figure 2 D are the lattice fringe measurement graphs of the TEM graph; Figure 2 E is the particle size distribution graph of nano calcium peroxide; Figure 2 F is the XRD graph of the prepared nano calcium peroxide material and calcium peroxide commercial reagent; Figure 2 G is the Raman graph of nano calcium peroxide.

[0017] Figure 3 is the antimony pollution repair experiment result graph of the application; Figure 3 a is the curve graph of the change of antimony removal rate with time; Figure 3 b is the antimony removal mechanism graph.

[0018] Figure 4 is the influence result of the dosing amount of nano-CaO2 and PFS on antimony pollution repair; Figure 4(a) Experimental results of adding 0.05 g, 0.1 g, 0.2 g, 0.25 g, and 0.3 g of nano-CaO2 to PFS with a setting of 0; Figure 4 (b) The experimental results for nano-CaO2 dosage of 0.05g and PFS dosage of 0.05g, 0.1g, 0.15g, 0.2g and 0.25g respectively; Figure 4 (c) shows the experimental results with a PFS dosage of 0.1 g and nano-CaO2 dosages of 0.05, 0.1, 0.2, 0.25, and 0.3 g respectively.

[0019] Figure 5 The results show the effect of pH on the antimony pollution removal rate; Figure 5 (a) The effect of different pH values ​​on Sb removal rate; Figure 5 (b) shows the initial pH of the solution and the final pH of the reaction under different conditions.

[0020] Figure 6 The results show the effects of oscillation frequency, temperature, and light conditions on the antimony pollution removal rate. Figure 6 (a) shows the effect of different oscillation frequencies on Sb removal rate; Figure 6 (b) shows the effect of different temperatures on Sb removal rate; Figure 6 (c) shows the effect of different light conditions on Sb removal rate.

[0021] Figure 7 The influence of groundwater chemical conditions on the antimony pollution removal rate; Figure 7 (a) The effect of adding common salt ions on Sb removal rate; Figure 7 (b) Initial pH of the solution after the addition of different salt ions and pH after the reaction. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] The method for removing antimony from mine well water using nano-calcium peroxide of the present invention includes the following steps:

[0024] S1. Preparation of nano-calcium peroxide

[0025] S101. Reagents and Materials

[0026] Calcium peroxide (CaO2), 75%, Cas:78403-22-2 Shandong Xiya Chemical Industry Co., Ltd.; Polyferric sulfate ([Fe2(OH)2]) n (SO4) 3-n / 2 ] mFe content: 21%, CAS: 35139-28-7, Shanghai Maclean Biochemical Technology Co., Ltd.; Hydrochloric acid (HCl), 36.0%-38.0%, CAS: 7647-01-0, Beijing Chemical Plant; Calcium chloride (CaCl2), analytical grade, CAS: 10043-52-4, Tianjin Kemeo Chemical Reagent Co., Ltd.; Potassium nitrate (KNO3), analytical grade, CAS: 7757-79-1, Tianjin Kemeo Chemical Reagent Co., Ltd.; Manganese sulfate (MnSO4•H2O), analytical grade. Pure grade, CAS: 10034-96-5, Tianjin Kemeo Chemical Reagent Co., Ltd.; Magnesium sulfate (MgSO4•7H2O), analytical grade, CAS: 10034-99-8, Tianjin Kemeo Chemical Reagent Co., Ltd.; Potassium chloride (KCl), analytical grade, CAS: 7447-40-7, Tianjin Kemeo Chemical Reagent Co., Ltd.; Sodium bicarbonate (NaHCO3), ≥99.5%, CAS: 144-55-8, Tianjin Kemeo Chemical Reagent Co., Ltd.; Ferric sulfate (Fe2(SO4) xH2O), Cas:10028-22-5, Tianjin Kemei Chemical Reagent Co., Ltd.; Deionized water (H2O), prepared in the laboratory (resistivity ≥18 MΩ) (cm); All reagents mentioned in this article are of analytical grade or higher.

[0027] The preparation of the salt stock solution used is shown in the table below:

[0028] surface -1 Preparation of saline stock solution

[0029]

[0030] Preparation method of S102 nano-CaO2

[0031] The specific synthesis steps of nano-CaO2 are as follows: Weigh 11.1 g of CaCl2 into a 200 mL beaker using an electronic balance, add 25 mL of pure water, and sonicate until the CaCl2 is fully dissolved; add 35 mL of concentrated ammonia, and slowly inject 20 mL of 30% H2O2 into the beaker at a flow rate of 0.2 mL / min, while maintaining high-speed magnetic stirring at 500 rpm during the injection process. During the H2O2 injection process, a pale yellow precipitate gradually appears, which is CaO2; centrifuge the pale yellow precipitate at 15000 rpm for 30 min, and wash it twice with pure water and at least three times with ethanol; remove the precipitate, dry it in a desiccator for 2 hours at a drying temperature of 80℃; then grind it in an agate grinding jar for at least 20 min until there is no particle feel.

[0032] S103. nano-CaO2 material characterization

[0033] The morphology and particle size of nano-CaO2 samples were measured using SEM and TEM (gold sputtering pretreatment was performed before TEM scanning, and a small amount of sample was ultrasonically dispersed in anhydrous ethanol for 5 min). XRD analysis was performed using a computer-controlled X-ray powder diffractometer. The structure of peroxide chemical bonds (i.e., -OO-) in the nano-CaO2 samples was characterized using Raman spectroscopy.

[0034] Figure 2 A is a SEM image of the prepared nano-CaO2. As can be seen from the image, the synthesized nano-calcium peroxide particles are approximately spherical in shape. Furthermore, based on the TEM image of the nano-calcium peroxide... Figure 2 B) and particle size distribution diagram ( Figure 2 E), the particle size of the nano-calcium peroxide is between 8 and 24 nm, with the main particle size distribution range being 10 to 20 nm, indicating that this material belongs to the nanoscale material category. We used Digital Micrograph software to measure the lattice fringes of the TEM images (…). Figure 2 (C, D) We can deduce that the lattice spacing of the nano-calcium peroxide we prepared is d=0.254nm (d=2.531 Å), which corresponds to the signal peak in the XRD, indicating that the material we synthesized is nano-sized calcium peroxide. Figure 2 F shows the XRD patterns of the prepared nano-calcium peroxide material and the commercial reagent for calcium peroxide. As can be seen from the figure, strong signal peaks appear at d = 3.058, 2.968, 2.531, and 1.925 Å. These peaks correspond precisely to calcium peroxide (JCPDS card number 85-0514, see...). Figure 3 The characteristic diffraction peak marked "a" in red in F indicates that the main component of our synthesized nanomaterial is calcium peroxide (in addition, it should be noted that the synthesized material also contains a small amount of CaClOH). Figure 2 G represents the Raman spectroscopy of nano-calcium peroxide, which is located at 842 cm⁻¹. -1 The strong RAMAN peak at [location] confirms the presence of peroxide chemical bonds (i.e., -OO-) in the prepared nano-calcium peroxide. Based on these results, it can be proven that the material we synthesized is high-purity nano-sized calcium peroxide.

[0035] S2. Antimony Contamination Remediation Experiment

[0036] S201. Experimental Procedure

[0037] Take 100 ml of mine well water (containing approximately 2.8 mg / L antimony) into a 250 ml Erlenmeyer flask, and sequentially add different dosages of PFS (0.05 g, 0.1 g, 0.15 g, 0.2 g, 0.25 g) and nano-CaO2 (0.05 g, 0.1 g, 0.2 g, 0.25 g, 0.3 g) to obtain the optimal dosage ratio. Under the optimal ratio conditions, add 0.1 mol / L NaOH solution and 0.1 mol / L H2SO4 solution to adjust the initial pH of the different solutions. ini (i.e., pH) 初 The pH values ​​were 3, 4.6, 8, 9, 10, and 11 to assess the impact of pH changes on the remediation effect. Degradation experiments were conducted using a constant-temperature shaker at T=298K and OF=120rpm. 1ml samples were taken at t=5min, 10min, 30min, 60min, and 120min, filtered through a 0.22µm water filter membrane, and diluted to a final volume of 10ml. The effect of sampling volume was negligible. Three copies of each treatment method were performed. The Sb concentration in the experimental water was determined using ICP-MS; the pH value was measured using a handheld measuring instrument (COMBI 5000).

[0038] After experimentation, the optimized standard conditions were obtained as follows: 100 ml of mine well water sample, antimony content approximately 2.8 mg / L, nano-CaO2 dosage 0.05 g, PFS dosage 0.1 g, initial pH 8, oscillation frequency (OF) 120 rpm, T = 298 K. The experimental results are as follows. Figure 3 As shown, the antimony removal rate gradually increases with the reaction time, reaching 98% within 120 minutes. This indicates that under the experimental conditions described above, the combined action of nano-CaO2 and PFS can effectively remove antimony pollution from water.

[0039] In the early stages of the reaction, the pH is acidic, and nano-CaO2 reacts with protons in the water (Equation 2-2) to rapidly generate H2O2; subsequently, Sb 3+ In nano-CaO2 / Fe 3+ It is gradually oxidized to Sb during the process. 5+ The Fenton-like reaction produces •OH and •O2. - and 1 O2 (Formulas 2-3 to 2-7) will oxidize Sb 3+ Oxidation into less toxic Sb 5+ The main reactive oxygen species (ROS). Due to metal ions (Ca... 2+ Fe 2+ Fe 3+The hydrolysis and complexation of calcium peroxide form a new Ca-Fe colloid, which can adsorb the heavy metal antimony in the water. As calcium peroxide continues to hydrolyze, the pH value of the water will continue to rise. Figure 1 ), Ca 2+ Fe 2+ Fe 3+ Coagulation efficiency in water treatment can be improved by forming precipitates (Equations 2-8, 2-9, and 2-10).

[0040]

[0041] Effects of S202.nano-CaO2 and PFS dosage

[0042] Without adding PFS, the experimental results of adding 0.05 g, 0.1 g, 0.2 g, 0.25 g, and 0.3 g of nano-CaO2 are as follows. Figure 4 As shown in (a), the Sb removal rate gradually increases with the increase of nano-CaO2 dosage, indicating that nano-CaO2 has a remediation effect on Sb heavy metal pollution. However, the removal rate is not ideal at low dosages. When the nano-CaO2 dosage is 0.05g, the antimony pollution removal rate can only reach 25.3%. However, when we add PFS and nano-CaO2 for combined remediation, that is, when nano-CaO2=0.05g and PFS=0.1g, the Sb removal rate can reach 97.8%, which can greatly improve the remediation of antimony pollution even with low nano-CaO2 dosage.

[0043] To investigate the effect of remediation material dosage on antimony contamination remediation and determine the optimal dosage ratio, the following two sets of experiments were conducted: 100 ml of mine well water samples were taken. In the first set of experiments, nano-CaO2 was added at a fixed dosage while the dosage of PFS was gradually increased; in the other set of experiments, PFS was added at a fixed dosage while the dosage of nano-CaO2 was gradually increased. Detailed experimental procedures are as follows:

[0044] With a fixed nano-CaO2 dosage of 0.05 g, the PFS dosages were 0.05 g, 0.1 g, 0.15 g, 0.2 g, and 0.25 g, respectively. The results are as follows: Figure 4 As shown in (b), it can be seen that the Sb removal rate gradually increases with the increase of PFS reagent dosage, while the pH value of the system also decreases. Excessive PFS will cause the pH value of the solution to be acidic. When PFS=0.1g, the Sb removal rate can reach 97.8%, and under this condition, the pH value of the system is 8.45, which is a relatively neutral pH value, making it more suitable for the remediation of antimony pollution in the natural environment.

[0045] With a fixed PFS dosage of 0.1 g, the nano-CaO2 dosages were 0.05, 0.1, 0.2, 0.25, and 0.3 g, respectively. The results are as follows: Figure 4 As shown in (c), the study indicates that with the increase of nano-CaO2 dosage, the Sb removal rate initially decreases slightly and then increases, but overall decreases. This phenomenon may be due to the following: the decomposition of nano-CaO2 generates Ca(OH)2, which raises the pH of the solution, hindering the release of H2O2. Furthermore, the solution causes Fe(OH)3 precipitation, leading to the precipitation of Fe... 3+ The reaction failed to catalyze the process, resulting in a decrease in Sb removal rate.

[0046] Based on the above results, the optimal dosage ratio of nano-CaO2 = 0.05g and PFS = 0.1g was selected. Subsequent experiments were conducted based on this optimal ratio.

[0047] S3. Study the impact of in-situ environmental factors in groundwater on the removal rate of antimony pollution in the aquatic environment.

[0048] Experiments were conducted simulating groundwater environmental conditions to study in-situ environmental factors of groundwater: pH, light intensity, temperature, oscillation frequency, and eight major anions and cations (K). + Na + Ca 2+ Mg 2+ HCO3 - Cl - NO3 - SO4 2- The impact of environmental factors on the removal rate of Sb pollution in aquatic environments was investigated by changing only one environmental factor in each experiment while keeping other environmental factors constant. The following control experiments were conducted: a light-shielding experiment to simulate a dark (no light) underground environment; temperature adjustment (T=323K) to simulate temperature changes; changing the oscillation frequency (OF=60rpm) to simulate changes in groundwater movement; and the addition of anions and cations to simulate changes in groundwater chemical conditions. Figure 6 The effects of oscillation frequency, temperature, and light conditions on nano-CaO2 / Fe 3+ The effect of the complex reaction on the removal of Sb.

[0049] S301. Effect of pH on Antimony Pollution Removal Rate

[0050] To investigate the effect of initial pH, under the optimized experimental conditions and optimal dosage ratio described above, the pH of the solution was adjusted to 3, 4.6, 8, 9, 10, and 11 using 0.1 mol / L H₂SO₄ or NaOH. The results are as follows. Figure 5 As shown, fromFigure 5 (a) It can be seen that pH 初 Variations within the pH range of 3-11 had minimal impact on Sb removal rates, which generally remained between 95% and 99%. With increasing initial pH, the Sb removal rate initially showed a slight increase followed by a slight decrease. Relatively speaking, the Sb removal rate was slightly higher under acidic conditions than under neutral and alkaline conditions. One reason for this is that under acidic conditions, calcium peroxide reacts with acidic protons, promoting rapid H₂O₂ formation. Another reason is that under alkaline conditions, iron ions react with hydroxide ions to form ferric hydroxide precipitate, resulting in a decrease in the concentration of dissolved catalyst and thus a decrease in removal rate. Furthermore, from... Figure 5 As can be seen in (b), the use of nano-CaO2 and PFS remediation agent will bring the pH of the water closer to neutral, which demonstrates the environmental friendliness of the technology.

[0051] S302. Effect of Oscillation Frequency on Antimony Pollution Removal Rate

[0052] Different oscillation frequencies were used to simulate the flow of groundwater and changes in water level fluctuations. The results are as follows: Figure 6 As shown in (a), the oscillation frequency has little effect on the Sb removal rate.

[0053] S303. Effect of Temperature on Antimony Pollution Removal Rate

[0054] like Figure 6 As shown in (b), we investigated the remediation of Sb pollution by the combined reaction of nano-CaO2 and PFS at different temperatures. The results show that the Sb removal rates achievable at 298K (25℃) and 323K (50℃) are not significantly different, and the reaction rates are relatively fast, reaching 97-99% removal rate within 5 minutes. Higher temperatures are relatively more conducive to the reaction, but overall the impact on the remediation reaction is small. Therefore, this method is suitable for lower water temperatures in groundwater environments.

[0055] S304. Effects of Irradiation Conditions on Antimony Pollution Removal Rate

[0056] exist Figure 6 As shown in (c), illumination conditions have little effect on the Sb removal rate of this method, and the removal curves show a consistent trend. Relatively speaking, the antimony removal rate is higher under dark conditions, indicating that this method is suitable for dark environments in groundwater. In summary, the method of using nano-CaO2 and PFS to remediate antimony pollution is relatively stable and applicable to groundwater environments.

[0057] S305. The Influence of Groundwater Chemical Conditions on Antimony Pollution Removal Rate

[0058] K+ Na + Ca 2+ Mg 2+ Mn 2+ HCO3 - SO4 2- NO 3- Cl - It is the most common ion. We prepared a high-concentration saline stock solution and added it to the experimental system to simulate the effect of groundwater chemical components on the remediation effect of Sb contamination. The results are as follows: Figure 7 As shown. The analysis leads to the following conclusions:

[0059] (1) K + Na + Ca 2+ Mg 2+ Mn 2+ SO4 2- NO 3- Cl - The addition of ions has little effect on the removal efficiency of Sb in this system.

[0060] (2) Adding HCO3 - Afterwards, as Figure 7 As shown by the yellow arrow in (a), the removal rate of Sb decreased from 97.8% to 89.9%, indicating that HCO3 removal rate decreased. - This reduces the effectiveness of the combined remediation of antimony pollution in water bodies using nano-CaO2 and polyferric sulfate. The reason is that adding HCO3 to the water... - This will significantly affect the pH of the water system (Equation 3-1), from Figure 7 (b) It can be seen that when HCO3 is added... - pH of the system 初 The concentration of HCO3- is higher than that of other ions in the system, which leads to a decrease in the Fenton reaction rate. - Its product CO3 under alkaline conditions 2- They will all react with hydroxyl radicals (Equations 3-2 to 3-4), thus leading to a decrease in the repair effect.

[0061]

[0062] This invention successfully synthesized nano-CaO2 and used it in conjunction with PFS as an antimony pollution remediation agent, applying it to the remediation of antimony pollution in mine tunnel inflow water. Using the above method, under optimal dosage conditions (0.05 g nano-CaO2), 2，A 0.1g PFS solution can achieve a 97.8% removal rate for antimony in mine drainage water containing approximately 2.8 mg / L. Experiments demonstrate that different pH, temperature, oscillation frequency, and light conditions have relatively little impact on the antimony remediation effect of this method. Relatively speaking, low pH, low oscillation frequency, high temperature, and no light conditions are conducive to the catalytic degradation of Sb. However, overall, changes in these environmental factors have a relatively small impact on the remediation effect, indicating that this method is well-suited for the remediation of antimony pollution in mine drainage water. It is worth noting that the removal efficiency of this method is affected by the concentration of HCO3- in the water. - The negative impact is significant.

[0063] In conclusion, the combined action of nano-CaO2 and PFS can effectively remediate antimony pollution in water bodies and has great application potential.

[0064] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A method for removing antimony from mine well water using nano-calcium peroxide, characterized in that, Includes the following steps: S1. Preparation of nano-calcium peroxide; S2. Antimony pollution remediation experiment; 100 mL of mine well water was placed in a 250 mL Erlenmeyer flask, and different doses of PFS and nano-CaO2 were added sequentially to obtain the optimal dosage ratio. Under the optimal dosage ratio, 0.1 mol / L NaOH solution and 0.1 mol / L H2SO4 solution were added to adjust the pH to evaluate the effect of pH change on the remediation effect. The degradation experiment was conducted using a constant temperature shaker at T=298 K and OF=120 rpm. 1 mL samples were taken at different time points and filtered through a 0.22 µm water filter membrane. 10 mL of each sample was then fixed. The effect of sampling volume was negligible. Each treatment method was repeated in triplicate. The optimized standard conditions for the antimony pollution removal rate experiment in the aquatic environment are as follows: mine inflow water sample = 100 mL, nano-CaO2 dosage = 0.05 g, PFS dosage = 0.1 g; pH = 3, 4.6, 8, 9, 10, 11; S3. Treat the antimony in the mine well water according to the standard conditions obtained in S2.

2. The method for removing antimony from mine well water using nano-calcium peroxide according to claim 1, characterized in that, The method for preparing nano-calcium peroxide in step S1 includes the following steps: Weigh 11.1g of CaCl2 into a 200mL beaker using an electronic balance, add 25mL of pure water, and sonicate until the CaCl2 is fully dissolved; add 35mL of concentrated ammonia, and slowly inject 20mL of 30% H2O2 into the beaker at a flow rate of 0.2mL / min, while maintaining high-speed magnetic stirring at 500rpm during the injection process; during the H2O2 injection process, a pale yellow precipitate gradually appears; centrifuge the pale yellow precipitate at 15000rpm for 30min, and wash it twice with pure water and more than three times with ethanol; remove the precipitate, dry it in a desiccator for 2 hours, and then grind it in an agate grinding jar until there is no particle feel.

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