A kind of algicide for flocculation and sedimentation of algae and preparation method thereof

Abstract

The invention relates to an algaecide and a preparation method thereof. The algaecide for flocculating and settling alga bodies contains the following components in parts by weight: 1000 parts of sodium alginate and 100-900 parts of multi-walled carbon nanotubes, wherein sodium alginate is added into deionized water at first, then the mixture is subjected to magnetic stirring until the sodium alginate is completely dissolved, and then 0.8-2.4 parts of the multi-walled carbon nanotubes or / and gallic acid are added. According to the preparation method of the algaecide, the sodium alginate, the multi-walled carbon nanotubes and an allelopathic substance namely the gallic acid are used as main ingredients to prepare a composite hydrogel ball algaecide, and the preparation method comprises the following steps: (1) adding a certain amount of sodium alginate / gallic acid into the deionized water, and performing magnetic stirring until the sodium alginate / gallic acid is completely dissolved; (2) adding the multi-walled carbon nanotubes, and mixing uniformly by using an ultrasonic assisted oscillation method to prepare a dispersion; (3) dropwise adding the dispersion into a 5-10% CaCl2 solution by using a dropper to cure into calcium gel balls, fixing for about 1-2h, then taking out, then flushing repeatedly with deionized water, and standing to remove surface residues; and (4) performing vacuum drying to prepare the algaecide.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to an algaecide, in particular to a sodium alginate / multi-walled carbon nanotube / gallic acid composite hydrogel ball algaecide, and a preparation method thereof. Background technique [0002] The most typical manifestations of eutrophication in water bodies are algae blooms, the color of water bodies turns green, and even "algae blooms" break out, leading to serious deterioration of water quality. Therefore, how to control and eliminate the explosive growth of harmful algae in eutrophic water bodies is currently a research hotspot and frontier in the field of water environment. At present, the methods to control the outbreak of algae bloom mainly include: physical method, chemical method and biological method. [0003] Physical methods mainly include mechanical salvage, sediment dredging, and artificial aeration. This method consumes a lot of manpower, m...

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Problems solved by technology

Gallic acid is the main allelochemical reported so far, which can significantly inhibit the growth of Microcystis aeruginosa (published in Water Research, 2000, 34(11):3026-3032), but it cannot make the algal cells settle to the bottom of the water body, which hinders the growth of Microcystis aeruginosa. watch