Preparation method of magnesium ferrite/silver phosphate compound photocatalyst

Abstract

The invention discloses a preparation method of a magnesium ferrite / silver phosphate compound photocatalyst. The preparation method comprises the following steps of (1) dropwise adding 50-100mL of 0.2-0.4mol / L silver nitrate in 50-100mL of 0.1-0.2mol / L sodium hydroxide solution while stirring, and separating a supernate so as to obtain silver oxide particles; adding 30-50mL of an ammonia-water solution with the mass concentration being 20%-25%, and stirring until silver oxide is fully dissolved to generate a silver ammonia complexing solution; and adding 0.4-0.6mol of ferric nitrate and 0.2-0.3mol of magnesium nitrate to the silver ammonia complexing solution, after stirring for 3-4h, adding 0.02-0.03mol of sodium dihydrogen phosphate, unceasingly stirring for 2-3h, filtering and washing for 3-4 times, drying at 110-120DEG C, roasting for 5-6h at 500-600DEG C, and performing furnace cooling so as to obtain the magnesium ferrite / silver phosphate compound photocatalyst. The preparation method provided by the invention has the advantages that a synthetic process is simple, silver phosphate and magnesium ferrite are closely contacted, transition of photoproduction electrons is facilitated, the recombination is avoided, and the catalytic efficiency is improved.

Description

technical field [0001] The invention belongs to the field of water treatment, and relates to a preparation method of a magnesium ferrite / silver phosphate 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] In June 2010, researchers from the Material Research Institute found that silver phosphate ha...

AI Technical Summary

Problems solved by technology

[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, and when they are used in liquid systems, smaller nanoparticles are suspended in the solution Not easy to settle, 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.