Method for treating harmful algae through photocatalysis

Abstract

The invention discloses a method for photocatalytic treatment of harmful algae, a silver oxide / phosphorus-doped carbon nitride microtube composite photocatalyst is used as a catalyst for photocatalytic treatment of harmful algae, the silver oxide / phosphorus-doped carbon nitride microtube composite photocatalyst comprises a phosphorus-doped carbon nitride microtube, and silver oxide particles grow on the surface and in the tube of the phosphorus-doped carbon nitride microtube in situ. According to the method disclosed by the invention, when the silver oxide / phosphorus-doped carbon nitride microtube composite photocatalyst is used as a catalyst for photocatalytic treatment of harmful algae, more active free radicals can be generated under an illumination condition, and the active free radicals can generate a stronger oxidative stress effect on algae cells, so that the algae cells can be inactivated more quickly and thoroughly; the method has the advantages of being simple in process, convenient to operate, low in treatment cost, high in treatment efficiency, good in removal effect, short in operation cycle and the like, is high in use value and good in application prospect, and has very important significance on in-situ treatment of algal blooms.

Description

technical field [0001] The invention belongs to the technical field of material preparation and water environment restoration, and relates to a method for photocatalytic treatment of harmful algae, in particular to a method for photocatalytic treatment of harmful algae using silver oxide / phosphorus doped carbon nitride microtube composite photocatalyst. Background technique [0002] With the rapid advancement of industrialization and urbanization and the continuous progress of social and economic development, the quality of water resources has been seriously polluted and damaged, such as the random discharge of organic pollutants and the influx of nutrients, which seriously pollutes and destroys the quality of natural water environment resources. Among them, the problem of water eutrophication caused by the influx of organic pollution has attracted great attention, because the outbreak of harmful algal blooms (such as cyanobacteria) caused by eutrophication of water bodies wi...

AI Technical Summary

Problems solved by technology

However, traditional photocatalysts can only be excited by ultraviolet light, and the catalytic efficiency under visible light is extremely low, and it is impossible to efficiently remove harmful algae under visible light. In situ governance is very important

[0004] As a catalyst or adsorbent, graphitic carbon nitride has been used to treat algae, however, there are still catalysts when graphitic carbon nitride materials or graphitic carbon nitride-based composite materials are used as catalyst materials for the treatment of algae. The root cause of defects such as large usage, high processing cost, and poor processing effect is that the existing graphite-phase carbon nitride-based composite materials still have poor photoresponse ability, small specific surface area, few active sites, poor catalytic activity, and poor stability. etc., and the use of precious metals leads to high cost; at the same time, the preparation method of the above-mentioned graphite phase carbon nitride-based composite material still has shortcomings such as complicated preparation process and harsh preparation conditions, so the existence of the above-mentioned defects and shortcomings makes The existing graphite-phase carbon nitride-based composite materials are difficult to remove algae thoroughly at low cost, which is not conducive to the in-situ treatment of algae blooms

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