Preparation method of magnesium ferrite/silver phosphate compound photocatalyst

A technology of silver phosphate and composite light, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as difficult separation and recovery, difficult to settle, difficult to meet long-term catalytic requirements, etc., to achieve Improve catalytic efficiency and avoid recombination effects

Active Publication Date: 2014-09-10
南通豫湖机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Under stirring, 100mL concentration of 0.2mol / L silver nitrate is added dropwise to 100mL concentration of sodium hydroxide solution of 0.1mol / L, after the supernatant is separated, silver oxide particles are obtained; 20% (mass percent concentration) of ammonia solution is stirred until silver oxide is completely dissolved to generate silver-ammonia complex solution; 0.4mol ferric nitrate and 0.3mol magnesium nitrate are added in the silver-ammonia complex solution, after stirring for 4h, add Add 0.03mol sodium dihydrogen phosphate to it, continue stirring for 3 hours, filter and wash 4 times, then dry at 120°C, bake at 600°C for 6 hours after drying, and obtain a magnesium ferrite / silver phosphate composite light after cooling in the furnace. catalyst.

[0016] The obtained magnesium ferrite / silver phosphate composite photocatalyst was added to 100mL of Orange II wastewater with a concentration of 50mg / L, and reacted for 30 minutes under the irradiation of a 300w iodi...

Embodiment 2

[0018] Under stirring, 50mL concentration of 0.4mol / L silver nitrate was added dropwise to 50mL concentration of sodium hydroxide solution of 0.2mol / L, after the supernatant was separated, silver oxide particles were obtained; to silver oxide particles, 30mL concentration of 25% (mass percentage concentration) of ammonia solution is stirred until silver oxide is completely dissolved to generate silver-ammonia complex solution; 0.6mol ferric nitrate and 0.2mol magnesium nitrate are added in the silver-ammonia complex solution, after stirring for 3h, add Add 0.02mol sodium dihydrogen phosphate to it, continue to stir for 2 hours, filter and wash three times, then dry at 110°C, bake at 500°C for 5 hours after drying, and obtain a magnesium ferrite / silver phosphate composite light after cooling in the furnace. catalyst.

[0019] The obtained magnesium ferrite / silver phosphate composite photocatalyst was added to 100mL of Orange II wastewater with a concentration of 50mg / L, and rea...

Embodiment 3

[0021] Under stirring, 100mL concentration of 0.2mol / L silver nitrate was added dropwise to 100mL concentration of 0.1mol / L sodium hydroxide solution, after the supernatant was separated, silver oxide particles were obtained; 25% (mass percent concentration) of ammonia solution is stirred until silver oxide is completely dissolved to generate silver-ammonia complex solution; 0.5mol ferric nitrate and 0.25mol magnesium nitrate are added in the silver-ammonia complex solution, after stirring for 4h, add Add 0.03mol sodium dihydrogen phosphate to it, continue to stir for 3 hours, filter and wash 4 times, then dry at 120°C, bake at 600°C for 6 hours after drying, and obtain a magnesium ferrite / silver phosphate composite light after cooling in the furnace. catalyst.

[0022] The obtained magnesium ferrite / silver phosphate composite photocatalyst was added to 100mL methylene blue wastewater with a concentration of 50mg / L, and reacted for 30 minutes under the irradiation of a 300w io...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185C02F1/30
Inventor 马建锋王凯李良银姚超
Owner 南通豫湖机械有限公司
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