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Ammonium molybdate modified catalyst as well as preparation method and application thereof

A technology of ammonium molybdate and catalyst, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., and can solve the problems of easy "death, long distance, slow response, etc.

Active Publication Date: 2021-08-31
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the serious question is :H 2 o 2 The decomposition rate is low; the lifespan of hydroxyl radical·OH is short (1 microsecond) and the utilization rate is low; the existence of iron ions leads to a large amount of iron sludge in the solution, causing secondary pollution and increasing treatment costs
However, so far, the number of active sites in heterogeneous Fenton catalysis is limited, and the distance between pollutant molecules and OH is relatively long and the reaction is slow. So far no good solution

Method used

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  • Ammonium molybdate modified catalyst as well as preparation method and application thereof
  • Ammonium molybdate modified catalyst as well as preparation method and application thereof
  • Ammonium molybdate modified catalyst as well as preparation method and application thereof

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preparation example Construction

[0038] In the present invention, the preparation method of described ammonium molybdate modified ferrous disulfide comprises the steps:

[0039] (1) Ammonium molybdate, ferrous sulfate heptahydrate, sodium thiosulfate and elemental sulfur are dissolved to obtain a mixed solution;

[0040] (2) Centrifuging the mixed solution after heating to obtain a precipitate;

[0041] (3) washing, centrifuging and drying the precipitate in sequence to obtain the ammonium molybdate-modified ferrous disulfide.

[0042] In the present invention, the mass ratio of ammonium molybdate and ferrous sulfate heptahydrate in the step (1) is preferably 0.15~0.2:7.5~7.6, more preferably 0.16~0.19:7.52~7.58, more preferably 0.17~ 0.18: 7.54 to 7.56.

[0043] In the present invention, the mass ratio of the ammonium molybdate to sodium thiosulfate is preferably 0.15-0.2: 7.5-7.6, more preferably 0.16-0.19: 7.52-7.58, more preferably 0.17-0.18: 7.54-7.56.

[0044] In the present invention, the mass ratio...

Embodiment 1

[0072] Preparation of ammonium molybdate modified ferrous disulfide:

[0073] Weigh 0.1700g ammonium molybdate, 7.5955g ferrous sulfate heptahydrate, 7.9054g sodium thiosulfate and 0.8016g elemental sulfur respectively, place the three materials in a ball mill and mill them for 40min at a speed of 400rpm. Mixed with ionic water; ultrasonically stirred at 50kHz, 1300rpm for 30min to dissolve to obtain a mixed solution;

[0074] The mixed solution was heated at 180°C for 24 hours to react, and after heating, it was cooled to room temperature, the reaction system was placed in a centrifuge tube, and centrifuged at 1100 rpm for 8 minutes to obtain a precipitate;

[0075] Wash the precipitate with distilled water 5 times, the amount of distilled water used for each cleaning is 40mL, centrifuge at 1100rpm for 8min after each cleaning, and centrifuge five times in total; after cleaning with distilled water, use carbon tetrachloride to wash 5 times, each time The consumption of clean...

Embodiment 2

[0095] Preparation of ammonium molybdate modified ferrous disulfide:

[0096] Weigh 0.1812g ammonium molybdate, 7.5623g ferrous sulfate heptahydrate, 7.5418g sodium thiosulfate and 0.8283g elemental sulfur respectively, put the three kinds of materials in a ball mill and mill them for 50min at a speed of 450rpm. Mixed with ionic water; ultrasonically stirred at 56kHz, 1360rpm for 25min to dissolve to obtain a mixed solution;

[0097] The mixed solution was heated at 185°C for 23h to react, and after heating, it was cooled to room temperature, the reaction system was placed in a centrifuge tube, and centrifuged at 1160rpm for 6min to obtain a precipitate;

[0098] The precipitate was washed 6 times with distilled water, and the amount of distilled water used for each cleaning was 30mL. After each cleaning, it was centrifuged at 1160rpm for 6 minutes, and it was centrifuged six times in total; The amount of carbon tetrachloride used for cleaning is 30mL, centrifuged at 1160rpm ...

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Abstract

The invention belongs to the technical field of catalysts. The invention provides an ammonium molybdate modified catalyst. The ammonium molybdate modified catalyst comprises ammonium molybdate modified ferrous disulfide and molybdenum disulfide in a mass ratio of (9.5-10.5) : (1.5-2.5). Molybdenum disulfide is added into the catalyst, sulfur defects are easily formed in a hydrogen peroxide solution, sulfur defects and Fe < 2 + > double active sites promote decomposition of hydrogen peroxide to oxidize and decompose organic pollutants, ammonium molybdate increases the number of active sites of ferrous disulfide, and the catalytic efficiency is improved; meanwhile, on the basis of self-repairing, Fe < 3 + > on the surface of the catalyst is promoted to be converted into Fe < 2 + > due to existence of sulfur defects, so that the purpose of circulation is achieved, and secondary pollution cannot be caused in the whole sewage treatment process. The invention further provides a preparation method of the catalyst, ammonium molybdate modified ferrous disulfide and molybdenum disulfide are combined by adopting a ball milling process, the process is simple, the technology is mature, and the catalyst is suitable for large-scale popularization.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to an ammonium molybdate modified catalyst and a preparation method and application thereof. Background technique [0002] The treatment of high-concentration, refractory, and highly toxic organic wastewater, such as printing and dyeing wastewater, pharmaceutical wastewater, papermaking wastewater, landfill leachate, and electroless EDTA in the electronics industry, has long been a difficult point in industrial wastewater treatment. The biodegradation of reactive dye wastewater is the most difficult. There are more than 100,000 varieties, more than 2,000 commonly used dyes, and new artificial dyes emerge in endlessly every year. Decomposition of H based on ferrous salts 2 o 2 Homogeneous Fenton catalysis to generate strong oxidizing hydroxyl radical·OH has been widely used in the treatment of various organic wastewaters. But the serious question is :H 2 o 2 The decomposition ...

Claims

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Application Information

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IPC IPC(8): B01J27/051C02F1/72C02F101/30C02F101/38
CPCB01J27/0515C02F1/725C02F1/722C02F2101/40C02F2305/023C02F2101/30Y02W10/37
Inventor 王异谭秀娘黄在银覃鲜萍蓝芝文
Owner GUANGXI UNIV FOR NATITIES
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