A kind of preparation method of silver phosphate/silver vanadate composite photocatalyst

Abstract

The invention discloses a preparation method of a silver / silver vanadate composite photocatalyst, which comprises the following steps: laying a 9-16 cm<2> silver foil on a horizontal surface, dipping a hair brush in 20-30mL of 15-30% (mass percent) H2O2 solution, brushing on the silver foil surface, and oxidizing the silver on the silver foil surface into silver oxide; dissolving 3-5g of V2O5 powder in 25-30mL of 20-25% (mass percent) of ammonia water, and keeping the ammonia water excessive to obtain an ammonium vanadate solution; dipping a hair brush into the ammonium vanadate solution, brushing on the silver foil surface of which the surface is silver oxide, dissolving the silver oxide into a silver-ammonia complex under the action of the ammonia water to finally generate a silver vanadate precipitate on the silver foil surface, thereby obtaining the silver / silver vanadate composite photocatalyst. The silver foil is the raw material and support of the catalyst, thereby avoiding the problem of separation of the powder after participating in wastewater treatment. The silver vanadate is supported on the silver surface to closely contact the silver, thereby being beneficial to transferring the photogenerated electrons and enhancing the catalytic efficiency.

Description

technical field [0001] The invention belongs to the field of water treatment, and relates to a preparation method of a silver phosphate / silver vanadate composite photocatalyst, in particular to a photocatalytic material for treating organic waste water and a preparation method thereof. Background technique [0002] At present, with the rapid development of industrial technology, the water resources that human beings rely on for survival are polluted to varying degrees, and water resource pollution has become an urgent problem that countries all over the world are facing. Pollutants in water, especially toxic organic pollutants, not only cause environmental pollution and ecological damage, but also seriously endanger human health. These organic pollutants include polycyclic aromatic hydrocarbons, polychlorinated biphenyls, pesticides, environmental interferons, dyes, etc. [0003] Silver vanadate is a new type of photocatalyst with visible light response. Its monoclinic phas...

AI Technical Summary

Problems solved by technology

However, due to the instability of silver phosphate itself, it is easy to self-erode in photocatalysis, resulting in a rapid decrease in the degradation performance of the catalyst.

[0004] Composite catalysts are conducive to electronic transitions, forming free radicals on the catalyst surface to improve catalytic efficiency. However, the semiconductor materials usually obtained are nano-powders. When they are used in liquid phase systems, smaller nanoparticles are not easy to suspend in the solution. Settling, difficult to separate and recover, not conducive to recycling and reuse

In addition, the stability of the composite catalyst is poor, the crystal growth is difficult, the particle size and loading are not easy to control, and it is difficult to meet the long-term catalytic requirements, which affects and limits its practical application in industrial production.