Degradation method of microcystic toxins in water
By combining a catalyst with visible light using a specific structure, the problems of poor removal efficiency and secondary pollution of microcystin have been solved, achieving efficient, rapid, and environmentally friendly degradation of microcystin, applicable to water samples of different concentrations.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- TIANJIN AGRICULTURE COLLEGE
- Filing Date
- 2024-10-18
- Publication Date
- 2026-04-21
AI Technical Summary
Existing technologies have poor removal efficiency for microcystin and are prone to secondary pollution. They also have slow degradation rates and are greatly affected by environmental factors.
A catalyst with a specific structure is mixed with a water sample containing microcystin and reacted under visible light. The reaction conditions are 50-5000 lux and the reaction time is 0.5-3 hours. This method is suitable for water samples with microcystin concentrations of 0.0001-10 mg/L.
It achieves a high-efficiency and rapid degradation rate of microcystin toxins of 95%-99.9%, has a wide range of applications, is environmentally friendly, easy to operate, and reduces energy consumption and costs.
Smart Images
Figure CN121894748A_ABST
Abstract
Description
I. Technical Field
[0001] This invention relates to the field of water treatment technology, and specifically to a method for degrading microcystin in water. II. Background Technology
[0002] With the increasing eutrophication of water bodies, cyanobacterial blooms are occurring frequently. Microcystins, as toxic secondary metabolites produced by cyanobacterial blooms, pose a serious threat to aquatic ecosystems and human health. Currently, the main methods for removing microcystins include physical, chemical, and biological methods. Physical methods, such as adsorption and filtration, can only transfer microcystins from the water body and cannot completely degrade them; chemical methods, such as oxidation and reduction, may produce secondary pollution; biological methods, such as microbial degradation, have a slow degradation rate and are greatly affected by environmental factors. Therefore, developing an efficient, rapid, and pollution-free method for degrading microcystins is of significant practical importance. III. Summary of the Invention
[0003] Purpose of the invention
[0004] The purpose of this invention is to provide a method for degrading microcystin in water, so as to solve the problems of poor microcystin removal effect and easy secondary pollution in the prior art.
[0005] Technical solution
[0006] This invention provides a method for degrading microcystin in water, comprising the following steps:
[0007] Water samples containing a certain concentration of microcystin were compared with structural... The catalysts were mixed in a certain proportion and stirred evenly to obtain a mixture. The mixture was then placed under visible light of different intensities and reacted for a period of time. The degradation rate of microcystin was then measured.
[0008] The initial concentration of the microcystin is 0.0001-10 mg / L.
[0009] The concentration of the catalyst in the water sample was 0.001-0.1 g / L.
[0010] The intensity of the illumination conditions is 50-5000 lux.
[0011] The reaction time is 0.5-3 hours.
[0012] The microcystin includes microcystin-LR and microcystin-RR.
[0013] The technical solution of the present invention has the following advantages:
[0014] 1. High efficiency and speed: By mixing a catalyst with a specific structure with a water sample containing microcystin and reacting it under visible light of a certain intensity, the concentration of toxins in the water sample can be significantly reduced in a short time, with a degradation efficiency of up to 95%-99.9%.
[0015] 2. Wide applicability: This method is applicable to water samples with varying concentrations of microcystin, ranging from 0.0001 mg / L to 10 mg / L. This means it can treat a wide range of water samples, from lightly polluted to heavily polluted. Furthermore, the catalyst concentration range is also relatively wide (0.001-0.1 g / L), providing flexibility for practical applications.
[0016] 3. Easy to achieve lighting conditions: Using visible light as the reaction condition avoids the need for ultraviolet light or high-intensity light sources, thus reducing energy consumption and costs. Furthermore, visible light is widely available in nature, so this method can be easily implemented outdoors or indoors.
[0017] 4. Environmentally friendly: The use of catalysts does not introduce new pollutants, and the reaction is likely to be easily recycled and treated, meeting environmental protection requirements. Furthermore, the use of visible light as an energy source reduces the use of chemical reagents, further minimizing the potential environmental impact.
[0018] 5. Simple operation: The method is simple and straightforward. It only requires mixing the water sample with the catalyst and reacting it under visible light for a period of time. It does not require complicated equipment or complicated operating procedures, making it easy to promote and apply.
[0019] In summary, the microcystin degradation method of the present invention has the advantages of high efficiency, wide applicability, low cost, environmental friendliness and simple operation, providing a new and effective means for treating water bodies polluted by microcystins. IV. Detailed Implementation
[0020] The present invention will be further described in detail below with reference to specific embodiments:
[0021] The following embodiments are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention.
[0022] Example 1
[0023] A water sample containing microcystin-LR at an initial concentration of 0.7 mg / L was placed in a reaction vessel. A catalyst was added to the reaction vessel to achieve a concentration of 0.08 g / L in the water sample. The mixture was stirred thoroughly to obtain a homogeneous solution. The solution was then placed under visible light at an intensity of 50 lux and reacted for 1.2 hours. The degradation rate of microcystin was determined to be 96.3%.
[0024] Example 2
[0025] A water sample containing microcystin-RR at an initial concentration of 0.0001 mg / L was placed in a reaction vessel. A catalyst was added to the reaction vessel to achieve a concentration of 0.009 g / L in the water sample. The mixture was stirred thoroughly to obtain a homogeneous solution. The solution was then placed under visible light at an intensity of 120 lux and reacted for 0.5 hours. The degradation rate of microcystin was determined to be 95.0%.
[0026] Example 3
[0027] A water sample containing microcystin-RR at an initial concentration of 0.09 mg / L was placed in a reaction vessel. A catalyst was added to the reaction vessel to achieve a concentration of 0.001 g / L in the water sample. The mixture was stirred thoroughly to obtain a homogeneous solution. The solution was then placed under visible light with an intensity of 1000 lux and reacted for 1 hour. The degradation rate of microcystin was determined to be 97.2%.
[0028] Example 4
[0029] A water sample containing microcystin-LR at an initial concentration of 0.006 mg / L was placed in a reaction vessel. A catalyst was added to the reaction vessel to achieve a concentration of 0.06 g / L in the water sample. The mixture was stirred thoroughly to obtain a homogeneous solution. The solution was then placed under visible light at an intensity of 2800 lux for 3 hours, and the degradation rate of microcystin was determined to be 98.2%.
[0030] Example 5
[0031] A water sample containing microcystin-RR at an initial concentration of 10 mg / L was placed in a reaction vessel. A catalyst was added to the reaction vessel to achieve a concentration of 0.02 g / L in the water sample. The mixture was stirred thoroughly to obtain a homogeneous solution. The solution was then placed under visible light at an intensity of 5000 lux for 2 hours, and the degradation rate of microcystin was determined to be 99.0%.
[0032] Example 6
[0033] A water sample containing microcystin-LR at an initial concentration of 5 mg / L was placed in a reaction vessel. A catalyst was added to the reaction vessel to achieve a concentration of 0.1 g / L in the water sample. The mixture was stirred thoroughly to obtain a homogeneous solution. The solution was then placed under visible light at an intensity of 3400 lux for 2.3 hours, and the degradation rate of microcystin was determined to be 99.9%.
[0034] Experimental Example 1
[0035] This experiment compares the degradation rate of microcystin-LR in water under different conditions.
[0036] Condition 1: There is visible light, and the structure is... Catalyst.
[0037] Condition 2: Visible light is present, and there is no structure. Catalyst.
[0038] Condition 3: No visible light, with a structure as Catalyst.
[0039] Condition 4: No visible light, no structure Catalyst.
[0040] The specific method is as follows:
[0041] 1. The initial concentration of microcystin-LR in the water sample was 0.7 mg / L;
[0042] 2. The water sample contains a structure of When using a catalyst, the catalyst concentration is 0.08 g / L;
[0043] 3. When there is visible light, the light intensity is 50 lux, and the reaction time is 1.2 hours;
[0044] 4. The concentration of microcystin-LR in water samples before and after treatment was determined by liquid chromatography-mass spectrometry, and the degradation rate of microcystin-LR was calculated.
[0045] Table 1. Degradation rate of microcystin-LR in water under different conditions
[0046]
[0047] Experimental Example 2
[0048] This experiment compared the degradation rates of microcystin-RR in water under different conditions.
[0049] Condition 5: Visible light is present, and the structure is... Catalyst.
[0050] Condition 6: Visible light is present, and there is no structure. Catalyst.
[0051] Condition 7: No visible light, with a structure as Catalyst.
[0052] Condition 8: No visible light, no structure Catalyst.
[0053] The specific method is as follows:
[0054] 1. The initial concentration of microcystin-RR in the water sample was 0.09 mg / L;
[0055] 2. The water sample contains a structure of When using a catalyst, the concentration of the catalyst is 0.001 g / L;
[0056] 3. Under visible light, with an intensity of 1000 lux, the reaction lasts for 1 hour;
[0057] 4. The concentration of microcystin-RR in water samples before and after treatment was determined by liquid chromatography-mass spectrometry, and the degradation rate of microcystin-RR was calculated.
[0058] Table 2 Degradation rate of microcystin-RR in water under different conditions
[0059]
[0060] As shown in Tables 1 and 2, the degradation rate of microcystins was very high (96.3% and 97.2%) when both visible light and a catalyst were present. Without visible light, the degradation rate was 0%, indicating that the presence of the catalyst did not lead to the degradation of microcystins, demonstrating that visible light is necessary for their degradation. Without a catalyst, the degradation rate was low (8.9% and 10.2%), indicating that the presence of the catalyst significantly improved the degradation rate. These experimental examples demonstrate that the method employed in this invention, which combines visible light and a catalyst with a specific structure, requires both to work together to efficiently and rapidly degrade microcystins in water. Visible light alone or a catalyst alone cannot achieve efficient and rapid degradation of microcystins.
[0061] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The patent scope of the present invention should not be limited by these embodiments. That is, all equivalent changes or modifications made in accordance with the spirit disclosed in the present invention still fall within the patent scope of the present invention.
Claims
1. A method for degrading microcystin in water, characterized in that, Includes the following steps: Water samples containing a certain concentration of microcystin were compared with structural... The catalysts were mixed in a certain proportion and stirred evenly to obtain a mixture. The mixture was then placed under visible light of different intensities and reacted for a period of time. The degradation rate of microcystin was then measured.
2. The method for degrading microcystin in water according to claim 1, characterized in that, The initial concentration of the microcystin is 0.0001-10 mg / L.
3. The method for degrading microcystin in water according to claim 1, characterized in that, The concentration of the catalyst in the water sample was 0.001-0.1 g / L.
4. The method for degrading microcystin in water according to claim 1, characterized in that, The intensity of the illumination conditions is 50-5000 lux.
5. The method for degrading microcystin in water according to claim 1, characterized in that, The reaction time is 0.5-3 hours.
6. The method for degrading microcystin in water according to claim 1, characterized in that, The microcystin includes microcystin-LR and microcystin-RR.