Preparation method of modified konjac glucomannan loaded copper sustained-release agent and its application in water bloom control

A technology of konjac glucomannan and sustained-release agent, which is applied in the preparation of modified konjac glucomannan-loaded copper sustained-release agent and in the application field of water bloom control, which can solve the secondary pollution of water body and the concentration of copper sulfate High, harmful to aquatic organisms and other issues, to achieve the effect of avoiding slow-release ability and wide application prospects

Active Publication Date: 2020-12-15
CHINA THREE GORGES UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most widely used chemical algae killing method is to put copper sulfate directly into the water body, but it is easy to cause the local concentration of copper sulfate to be too high, thereby endangering other aquatic organisms in the water, and long-term use will also cause secondary pollution of the water body
In addition, the copper ions formed after copper sulfate enters the water body will be quickly converted into copper carbonate (CuCO 3 , K ap =1.4×10 -10 ) and copper hydroxide (Cu(OH) 2 , K ap =2.2×10 -20 ) and precipitate, reducing the efficiency of the algaecide

Method used

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  • Preparation method of modified konjac glucomannan loaded copper sustained-release agent and its application in water bloom control
  • Preparation method of modified konjac glucomannan loaded copper sustained-release agent and its application in water bloom control
  • Preparation method of modified konjac glucomannan loaded copper sustained-release agent and its application in water bloom control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Fresh konjac was dried and crushed, sieved, purified by ethanol and then dried; weighed 1.0 g of purified konjac glucomannan, put it into a 250 mL beaker, added distilled water to prepare 100 g of 1% glucomannan solution, and added to To this was added 200g of soybean oil and 30g of acrylate. Stir in a constant temperature water bath and control the temperature at 75 °C. Dissolve 12g of triethylamine, 5g of saponin, and 30g of absolute ethanol in 30mL of distilled water. The mixture was added to the above solution, emulsified and stirred for 120 min. Stir at room temperature for 4 h, then filter with suction, and wash repeatedly with distilled water until the filtrate is neutral, then collect the product. Get the konjac glucomannan of above-mentioned 200g modification and place in the beaker of 500 mL, take by weighing 108g 8-hydroxyquinoline copper and add in the beaker. Stir vigorously at room temperature for 3 h, filter with suction, and wash repeatedly with disti...

Embodiment 2

[0031]Fresh konjac was dried and crushed, sieved, purified with methanol or ethanol, and then dried; weighed 2.0 g of purified konjac glucomannan, put it into a 250 mL beaker, and added distilled water to prepare a 3% glucomannan solution. 300 g of soybean oil and 30 g of acrylate were added thereto. Stir in a constant temperature water bath and control the temperature at 85°C. Dissolve 10g of sodium hydroxide, 10g of polyacrylamide, and 50g of absolute ethanol in 50mL of distilled water. The mixture was added to the above solution, emulsified and stirred for 120 min. Stir at room temperature for 4 h, then filter with suction, and wash repeatedly with distilled water until the filtrate is neutral, and collect the product modified konjac glucomannan. Take 200 g of the above-mentioned modified konjac glucomannan and place it in a 500 mL beaker, weigh 205 g of copper aminophenylporphyrin and add it to the beaker. Stir vigorously at room temperature for 3 h, filter with suction...

Embodiment 3

[0037] Fresh konjac was dried and crushed, sieved, purified with methanol or ethanol, and then dried; weighed 2.5 g of purified konjac glucomannan, added it to a 250 mL beaker, and added distilled water to prepare a 2.2% glucomannan solution. To this was added 250g soybean oil and 45g acrylate. Stir in a constant temperature water bath and control the temperature at 85°C. Dissolve 20g of sodium hydroxide, 65g of soybean lecithin, and 50g of absolute ethanol in 50mL of distilled water. The mixture was added to the above solution, emulsified and stirred for 150 min. Stir at room temperature for 5 h, then filter with suction, and wash repeatedly with distilled water until the filtrate is neutral, and collect the product modified konjac glucomannan. An appropriate amount of modified konjac glucomannan was placed in a 500 mL beaker, and 170 g of copper dihydroxysuccinate was weighed and added to the beaker. Stir vigorously at room temperature for 3 h, filter with suction, and wa...

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Abstract

The invention discloses a preparation method of a modified konjac glucomannan loaded copper slow release agent and application in algal bloom control. Konjac flour is adopted as a raw material to prepare loaded copper modified konjac glucomannan; with blue algae, green algae, diatom, pyrrophyta and the like as indoor experimental algae, the result indicates that the modified konjac glucomannan loaded copper realizes an obvious inhibiting effect on the growth of different algae and has a characteristic of slow release controlling on algae growth. The loaded copper slow release agent has an obvious control effect on algal bloom of the blue algae, the green algae, the diatom and the pyrrophyta in a natural water body; field experiments prove that the loaded copper slow release agent can prevent outbreak of algal bloom within 1-3 years. By adding 0.5-1.0g / L of the loaded copper modified konjac glucomannan into the water body, the Cu<2+> is lower than the standard limit in the Standards forDrinking Water Quality and the Cu<2+> content of class-III water quality in the Environmental Quality Standards for Surface Water. The slow release algae control agent has the advantages of high efficiency and quickness of copper sulfate; the slow release ability also avoids the shortcoming of extremely high local concentration of copper sulfate caused by direct adding of copper sulfate, and is also natural and nontoxic and biodegradable, and thus is a natural, safe and efficient algae control agent with a broad application prospect.

Description

technical field [0001] The invention provides a copper-loaded modified konjac glucomannan slow-release agent and its application in controlling the outbreak of algal blooms. Background technique [0002] With the rapid development of industrial and agricultural production and the expansion of urban scale, a large amount of industrial wastewater, domestic sewage and farmland surface runoff are discharged into the lake water body, which intensifies the eutrophication of the lake. During the eutrophication process of lakes, algae (especially blue-green algae) multiply to form algal blooms. The formation of cyanobacterial blooms, on the one hand, leads to the decrease of water transparency, the decrease of dissolved oxygen, and the increase of suspended solids and COD; on the other hand, it produces and secretes a large number of secondary metabolites, such as toxins and odor compounds. These secondary metabolites can not only affect the quality of drinking water and aquatic pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N25/10A01N43/42A01N43/90A01N37/36A01N63/32C02F1/50A01P13/00
CPCA01N25/10A01N37/36A01N43/42A01N43/90A01N63/30C02F1/50
Inventor 刘立明刘文景杨萌胡佳明王冬梅邹德新刘卓黄兆云
Owner CHINA THREE GORGES UNIV
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