Preparation method of silver phosphate composite photocatalyst for treating malachite green in water

Abstract

The invention discloses a preparation method of a silver phosphate composite photocatalyst for treating malachite green in water. The method comprises the following steps of: (1) performing ultrasonictreatment on multi-walled carbon nanotubes (MWCNTs) treated by HNO3 for 2-5 h; (2) dropwise adding an AgNO3 solution to a MWCNTs solution and performing stirring in the dark for 6-20 h; (3) adding Na2HPO4.12H2O dropwise to the above solution, performing stirring in the dark for 1 to 6 hours, and then performing vacuum drying; (4) uniformly mixing [(CH3)2CHO]4Ti, Sr(Ac)2 and Cr(NO3)3.9H2O with a molar ratio of 20:19:1 in an ethylene glycol solution, performing continuous stirring at 120-160 DEG C until the solution becomes a powder; (5) mixing the obtained powder with NaOH solution with a concentration of 2-6 mol / L under stirring for 20-60 min, placing the mixture in a hydrothermal reaction kettle, and performing a reaction at 180 DEG C for 30-40 h; and (6) performing ultrasonic treatmenton MWCNTs@Ag3PO4 for 10 to 60 min, adding a polyvinylpyrrolidone solution, performing stirring for 20-60 min, adding the ultrasonically-treated Cr:SrTiO3 dropwise to the above stirred solution, performing a reaction for 3-8 hours, and performing washing and drying, so as to obtain Ag3PO4@MWCNTs@Cr:SrTiO3. The material prepared by the preparation method of the invention has the advantages of friendliness to environment, economy, good visible light catalytic performance and the like.

Description

technical field [0001] The invention belongs to the technical field of semiconductor material photocatalysis application and environmental protection, and in particular relates to a method for preparing a silver phosphate composite photocatalyst for treating malachite green in water Background technique [0002] With the continuous expansion of the population, people's demand for energy is increasing day by day, and the environmental pollution caused by the excessive exploitation of non-renewable energy and the use of inferior energy has made the energy crisis and environmental problems more and more serious. As a clean and renewable energy source, solar energy has attracted much attention to solve the energy crisis, but how to effectively use solar energy to achieve sustainable development is undoubtedly an urgent problem that countries need to solve. Photocatalytic technology is a new type of green technology, which is developing rapidly in the field of new energy developm...

AI Technical Summary

Problems solved by technology

However, the single semiconductor photocatalytic material has the problem of low quantum efficiency, the fundamental reason is that the recombination process of photogenerated electron-hole pairs is much faster than the capture-transfer process.

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