Algae inhibition material as well as preparation method and application thereof

Abstract

A preparation method of the algal inhibition material comprises the following steps: 1) adding a matrix material into a composite metal salt solution, and uniformly stirring to obtain a mixed solution; 2) under a stirring condition, dropwise adding an alkali solution into the obtained mixed solution, and performing stirring treatment, centrifugal separation, cleaning and drying; and 3) calcining the dried solid to obtain the algal inhibition material. According to the invention, a composite metal oxide system in which a small amount of silver oxide is combined with a specific metal oxide is adopted, so that high-efficiency loading of the composite metal oxide in a matrix material can be promoted; the obtained algal inhibition material has excellent algal inhibition performance, the related treatment period is short, the algal inhibition efficiency is high, the algal inhibition performance is relatively stable, phosphorus-containing components in water can be effectively removed, and the applicability is wide.

Description

Technical Field

[0001] The present invention belongs to the technical field of water treatment, and in particular relates to an algae-inhibiting material and a preparation method and application thereof. Background Art

[0002] With the continuous expansion of human activities and the acceleration of industrialization, water resources such as lakes and reservoirs are facing severe challenges. Among these, eutrophication and excessive algae growth are the most serious problems. Excessive algae growth not only disrupts the ecological balance of water bodies but also has significant impacts on drinking water safety, fisheries, and tourism. Therefore, the development of efficient and easy-to-use algae control technologies is urgently needed.

[0003] Currently, the main methods used to control excessive algae growth include physical, chemical, and biological methods. Physical methods primarily inhibit algae growth by changing water environmental conditions (such as temperature, light, and agitation); chemical methods kill or inhibit algae growth by adding chemicals (such as algaecides) to the water; and biological methods exploit the competitive relationship between certain microorganisms or plants and algae to inhibit algae growth. However, in practice, these methods all suffer from high costs, inconsistent algae removal results, and slow results, hindering their widespread application. Summary of the Invention

[0004] The main purpose of the present invention is to provide an algae-inhibiting phosphorus-fixing material to address the problems and shortcomings of the existing technology. The material can be applied to eutrophic and algae-polluted water bodies to effectively inhibit the growth of algae.

[0005] To achieve the above object, the technical solution adopted by the present invention is: A method for preparing an algae-inhibiting material comprises the following steps: 1) adding a matrix material to a composite metal salt solution and stirring uniformly to obtain a mixed solution A; the composite metal salt comprises a main metal salt and an auxiliary silver salt, wherein the main metal salt is an alkaline earth metal salt and / or a transition metal salt; 2) Adding an alkaline solution dropwise to the mixed solution A under stirring, stirring, centrifuging, washing, and drying to obtain solid B; 3) calcining the solid B to obtain the algae-inhibiting material.

[0006] In the above solution, the matrix material is one or more of activated carbon, zeolite, bentonite, diatomaceous earth, montmorillonite and the like.

[0007] In the above scheme, the alkaline earth metal salt is one or more of calcium, aluminum, and magnesium salts; the transition metal salt is one or more of iron, lanthanum, cerium, and zirconium salts.

[0008] Furthermore, in the composite metal salt solution, the total molar concentration of metal ions is 5mM-5M.

[0009] Furthermore, in the composite metal salt, the molar ratio of the introduced silver ions to other composite metal ions (preferably lanthanum, iron or magnesium) introduced into the main metal salt is 0.1-1:1.

[0010] In the above solution, the solid-liquid ratio of the matrix material to the metal salt solution is 0.5-500g:1L.

[0011] In the above scheme, the stirring time in step 1) is 0.5-5h.

[0012] In the above scheme, the alkaline solution is one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, and potassium carbonate solution, and its concentration is 0.01-6 mol / L.

[0013] In the above scheme, in step 2), an alkaline solution is added to adjust the pH value of the resulting solution system to 12.0-14.0.

[0014] In the above scheme, the stirring treatment time is 0.5-5h.

[0015] In the above scheme, the calcination temperature is 150-700° C., and the calcination time is 1-8 h.

[0016] The algae-inhibiting material prepared according to the above scheme can not only directly inhibit the growth of algae, but also effectively remove phosphorus in water and block the nutrient supply of algae.

[0017] The present invention also provides the use of the algae-inhibiting material in an algae-containing system. The specific preparation method comprises the following steps: adding the algae-inhibiting material to an algae-containing water body and irradiating the water body under visible light.

[0018] In the above scheme, the solid-liquid ratio of the algae-inhibiting material to the algae-containing water is 0.05-50g:1L.

[0019] In the above scheme, the algae in the algae-containing water body include but are not limited to one or more of Chlorella vulgaris, Microcystis aeruginosa, Scenedesmus quadricauda, ​​and Scenedesmus obliquus.

[0020] In the above scheme, the irradiation time under visible light is more than 2 hours.

[0021] Compared with the prior art, the present invention has the following beneficial effects: 1) The present invention uses activated carbon, zeolite, bentonite, diatomaceous earth, montmorillonite, etc. as carriers, combined with composite metal salts and alkaline stirring conditions to promote the efficient loading of composite metal oxides in the carrier. The resulting algae-inhibiting material has excellent algae-inhibiting properties and effectively removes phosphorus from water; 2) The algae-inhibiting material of the present invention has the advantages of rapid effect and stable performance, which can effectively shorten the treatment cycle and improve the algae-inhibiting efficiency; 3) The algae-inhibiting material of the present invention has a simple preparation process, low cost, simple application method, and is easy to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a comparison of algae growth between the control group and the experimental group in Example 1 of the present invention; Figure 2 This is a graph showing the change in chlorophyll a concentration over time in the experimental group in Example 1 of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below using specific examples. It should be noted that the following examples are intended only to further illustrate the present invention and are not to be construed as limiting the scope of protection of the present invention. Those skilled in the art may, based on the above disclosure, make non-essential improvements and adjustments to the present invention.

[0024] Example 1 An algae-inhibiting material, the preparation method of which comprises the following steps: 1) Weigh 5 g of zeolite and add it to 100 mL of a mixed solution A of lanthanum chloride and silver nitrate, where the concentration of lanthanum chloride is 0.1 mol / L and the concentration of silver nitrate is 0.08 mol / L. 2) Add 2 mol / L NaOH solution dropwise to the mixed solution A under stirring until the pH value of the solution A reaches 13; continue stirring for 4 h, centrifuge, wash, and dry to obtain solid B; 3) Place solid B in a muffle furnace and calcine at 250°C for 2 hours to obtain the algae-inhibiting material.

[0025] The obtained algae-inhibiting material is applied to treat algae-containing water bodies, and the specific steps are as follows: Weigh 0.03 g of the algae-inhibiting material and add it to 100 mL of Microcystis aeruginosa culture medium. The initial chlorophyll a concentration is 570 μg / L. A control group is also set up, that is, no algae-inhibiting material is added. The control group and the experimental group are placed in an incubator with a light intensity of 2000 lux and 25°C. After 4 hours, the algae-inhibiting effect is as follows: Figure 1 As shown in the figure, algae were hardly seen in the experimental group. The addition of anti-algae materials significantly inhibited the growth of algae. Figure 2 The data showed that the chlorophyll a concentration eventually dropped to 15μg / L, the algae inhibition rate reached more than 97%, and it could also achieve a certain phosphorus removal effect.

[0026] Example 2 An algae-inhibiting material, the preparation method of which comprises the following steps: 1) Weigh 5 g of zeolite and add it to 100 mL of a mixed solution A of 0.1 mol / L ferric chloride and 0.1 mol / L silver nitrate. 2) Add 1 mol / L NaOH solution dropwise to the mixed solution A under stirring until the pH of the solution A reaches 13.5. Continue stirring for 4 h, centrifuge, wash, and dry to obtain solid B. 3) The solid B was placed in a muffle furnace and calcined at 300°C for 2 hours to obtain the algae-inhibiting material.

[0027] The resulting algae-inhibiting material was applied to treat aquatic water bodies. The specific steps were as follows: 0.02 g of the algae-inhibiting material was added to 100 mL of a culture medium of Microcystis aeruginosa, with an initial chlorophyll a concentration of 413 μg / L. A control group was also established, without the addition of the algae-inhibiting material. Both the control and experimental groups were incubated in an incubator at 25°C and 2000 lux. After 4 hours, the chlorophyll a concentration in the experimental group dropped to 6 μg / L, achieving an algae inhibition rate of over 98%.

[0028] Example 3 An algae-inhibiting material, the preparation method of which comprises the following steps: 1) Weigh 5 g of montmorillonite and add it to 100 mL of a mixed solution A of magnesium chloride and silver nitrate, where the concentration of magnesium chloride is 0.2 mol / L and the concentration of silver nitrate is 0.1 mol / L. 2) Add 2 mol / L NaOH solution dropwise to the mixed solution A under stirring until the pH of the solution A reaches 13.7; continue stirring for 4 h, centrifuge, wash, and dry to obtain solid B; 3) Place solid B in a muffle furnace and calcine at 200°C for 2 hours to obtain the algae-inhibiting material.

[0029] The obtained algae-inhibiting material is applied to treat algae-containing water bodies, and the specific steps are as follows: 0.02 g of the algae-inhibiting agent was added to 100 mL of Microcystis aeruginosa culture medium, with an initial chlorophyll a concentration of 389 μg / L. A control group was also established, without the addition of the agent. Both the control and experimental groups were cultured in an incubator at 25°C and 2000 lux. After 4 hours, the chlorophyll a concentration in the experimental group dropped to 5 μg / L, achieving an algae inhibition rate of over 98%.

[0030] Comparative Example 1 An algae-inhibiting material, the preparation method of which comprises the following steps: 1) Weigh 5 g of zeolite and add 100 mL of 0.1 mol / L silver nitrate solution; 2) Add 2 mol / L NaOH solution dropwise to the mixed solution A under stirring until the pH value of the solution A reaches 13; continue stirring for 4 h, centrifuge, wash, and dry to obtain solid B; 3) Place solid B in a muffle furnace and calcine at 250°C for 2 hours to obtain the algae-inhibiting material.

[0031] The obtained algae-inhibiting material is applied to treat algae-containing water bodies, and the specific steps are as follows: 0.02 g of the algae-inhibiting material was added to 100 mL of Microcystis aeruginosa culture medium, with an initial chlorophyll a concentration of 570 μg / L. Test results showed that after 4 hours, the chlorophyll a concentration dropped to 200 μg / L, and the algae inhibition rate was approximately 64.9%.

[0032] Comparative Example 2 An algae-inhibiting material, the preparation method of which comprises the following steps: 1) Weigh 5 g of zeolite and add 100 mL of 0.2 mol / L lanthanum chloride solution; 2) Add 2 mol / L NaOH solution dropwise to the mixed solution A under stirring until the pH value of the solution A reaches 13; continue stirring for 4 h, centrifuge, wash, and dry to obtain solid B; 3) Place solid B in a muffle furnace and calcine at 250°C for 2 hours to obtain the algae-inhibiting material.

[0033] The obtained algae-inhibiting material is applied to treat algae-containing water bodies, and the specific steps are as follows: 0.03 g of the algae-inhibiting material was added to 100 mL of Microcystis aeruginosa culture medium, with an initial chlorophyll a concentration of 570 μg / L. Test results showed that after 4 hours, the chlorophyll a concentration dropped to 500 μg / L, with an algae inhibition rate of approximately 12.3%.

[0034] The present invention is not limited to the above-described embodiments. Persons skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are deemed to be within the scope of protection of the present invention. Any matters not described in detail in this specification constitute prior art known to those skilled in the art.

Claims

1. A method for preparing an algae-inhibiting material, characterized in that: The following steps are involved: 1) adding the matrix material to a composite metal salt solution and stirring uniformly to obtain a mixed solution; the composite metal salt comprises a main metal salt and an auxiliary silver salt, and the main metal salt is an alkaline earth metal salt and / or a transition metal salt; 2) adding an alkaline solution dropwise to the resulting mixed solution under stirring, stirring, centrifuging, washing, and drying; 3) calcining the solid obtained by drying to obtain the algae-inhibiting material.

2. The preparation method according to claim 1, characterized in that The alkaline earth metal salt is one or more of calcium, aluminum, and magnesium salts; the transition metal salt is one or more of iron, lanthanum, cerium, and zirconium salts.

3. The preparation method according to claim 2, characterized in that In the composite metal salt solution, the total molar concentration of metal ions is 5mM-5M.

4. The preparation method according to claim 1, characterized in that The matrix material is one or more of activated carbon, zeolite, bentonite, diatomaceous earth and montmorillonite.

5. The preparation method according to claim 1, characterized in that The solid-to-liquid ratio of the matrix material to the metal salt solution is 0.5-500g:1L.

6. The preparation method according to claim 1, characterized in that In step 2), an alkaline solution is added to adjust the pH value of the resulting solution system to 12.0-14.

0.

7. The preparation method according to claim 1, characterized in that The stirring time in step 1) is 0.5-5 hours; the stirring time in step 2) is 0.5-5 hours.

8. The preparation method according to claim 1, characterized in that The calcination temperature is 150-700° C., and the calcination time is 1-8 h.

9. The algae-inhibiting material prepared by the preparation method according to any one of claims 1 to 8.

10. Use of the algae-inhibiting material according to claim 9 in an algae-containing system, characterized in that: The method specifically comprises the following steps: adding an algae-inhibiting material into an algae-containing water body and irradiating the algae-containing water body under visible light; the solid-liquid ratio of the algae-inhibiting material to the algae-containing water body is 0.05-50g:1L.

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