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Preparation method of supported iron-molybdate catalyst and application of catalyst to degradation of dye wastewater

An acid catalyst, iron molybdate technology, applied in molecular sieve catalyst, physical/chemical process catalyst, textile industry wastewater treatment and other directions, can solve the problems of difficult separation and recovery of suspension system, high operating cost, poor reproducibility, etc. Large surface, high catalytic efficiency, small particle effect

Inactive Publication Date: 2013-10-23
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, if the catalyst powder is directly applied to the degradation of the dye aqueous solution, the dispersed suspension system has the disadvantages of being difficult to separate and recover, and easy to agglomerate, resulting in poor reproducibility and high operating costs.

Method used

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  • Preparation method of supported iron-molybdate catalyst and application of catalyst to degradation of dye wastewater
  • Preparation method of supported iron-molybdate catalyst and application of catalyst to degradation of dye wastewater
  • Preparation method of supported iron-molybdate catalyst and application of catalyst to degradation of dye wastewater

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Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1: the preparation of unsupported iron molybdate catalyst

[0032] According to the ratio of the amount of substance n Mo : n Fe = 2:1, respectively weigh ammonium molybdate and ferric nitrate solids, and prepare a certain concentration of ammonium molybdate and ferric nitrate solutions.

[0033] Add 8-12mL of 2mol / L ammonia water to 100mL of ammonium molybdate aqueous solution, and adjust the pH until the solution is weakly alkaline. Add 100mL ferric nitrate aqueous solution dropwise to the mixture, stir vigorously at room temperature for 2h to obtain a precipitate, filter, wash with distilled water, dry at 105°C, and calcinate in a muffle furnace at 550°C for 2h.

Embodiment 2

[0034] Embodiment 2: the preparation of diatomite supported iron molybdate catalyst

[0035] Wash 30g of diatomaceous earth for 3 times and then dry at 130°C for 1h. According to m 载体 :m 催化剂 =4:1 relationship, get 12g of diatomaceous earth for subsequent use.

[0036] According to the ratio of the amount of substance n Mo : n Fe = 2:1, respectively weigh ammonium molybdate and ferric nitrate solids, and prepare a certain concentration of ammonium molybdate and ferric nitrate solutions.

[0037] Add 8-12mL of 2mol / L ammonia water to the suspension of 100mL of ammonium molybdate and 12g of diatomaceous earth, and stir evenly. Add 100mLmol / L ferric nitrate solution dropwise to the above mixture, stir vigorously at room temperature for 2h to obtain a precipitate, which is aged for 3 hours, filtered, washed with distilled water, dried at 105°C for 12h, and calcined in a muffle furnace at 550°C 2h.

Embodiment 3

[0038] Embodiment 3: Preparation of zeolite-supported iron molybdate catalyst

[0039] Zeolite with different specifications (80 mesh, 100 mesh, 120 mesh) was washed, dried, and set aside.

[0040] According to the ratio of the amount of substance n Mo : n Fe = 2:1, respectively weigh ammonium molybdate and ferric nitrate solids, and prepare a certain concentration of ammonium molybdate and ferric nitrate solutions.

[0041] Add 8-12mL 2mol / L ammonia water to the suspension of 100mL ammonium molybdate and 12g zeolite, and stir evenly. Add 100mL of ferric nitrate solution dropwise to the mixture, stir vigorously at room temperature for 2h to obtain a precipitate, which is aged for 3 hours, filtered, washed with distilled water, dried at 105°C for 12h, and calcined in a muffle furnace at 550°C for 2h.

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Abstract

The invention relates to a preparation method of a supported iron-molybdate catalyst and an application of the supported iron molybdate catalyst to the degradation of dye wastewater. The supported iron-molybdate solid acid catalyst is synthesized from such raw materials as ammonium molybdate, ferric nitrate, diatomaceous earth, zeolite and a molecular sieve by adopting an aqueous precipitation method. The synthesis method of the supported iron-molybdate solid acid catalyst comprises the following steps of mixing a carrier with a solution of ammonium molybdate fully, adjusting the pH value of a medium by using aqueous ammonia until the medium is weakly alkaline; and dropwise adding a solution of ferric nitrate into the solution of ammonium molybdate, stirring the two solutions fully, ageing, filtering, washing, drying, and calcining in a muffle furnace for 2 hours at the temperature of 550 DEG C. The supported iron-molybdate solid acid catalyst can be used for degrading the methylene-blue simulated wastewater and the turquoise blue real wastewater quickly and effectively without adjusting the pH value of the dye and generating iron sludge, thus reagents are saved, and the separation becomes easy. The supported iron-molybdate solid acid catalyst can be recycled.

Description

technical field [0001] The invention relates to the synthesis of a solid acid catalyst and the application of the catalyst in Fenton-like reactions. It is technically involved in the fields of inorganic synthetic chemistry and sewage treatment. Background technique [0002] The Fenton method is an efficient and economical advanced oxidation technology in the degradation of organic pollutants. The traditional Fenton method is a method using H 2 o 2 as oxidant, Fe 2+ Homogeneous catalytic oxidation method for the catalyst. Under acidic conditions, H 2 o 2 The generated OH has a high oxidation-reduction potential, which can quickly oxidize pollutants in wastewater without selectivity, and can crack macromolecular organic substances that are difficult to biodegrade in wastewater into small molecular organic substances that are easily degraded by microorganisms, or completely ore. into CO 2 and H 2 o 2 , so the homogeneous Fenton method has a wide range of applications ...

Claims

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Application Information

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IPC IPC(8): B01J23/881B01J29/072B01J29/46C02F1/72C02F103/30C02F103/38
Inventor 刘瑛耿文豪陈新商少明高海燕
Owner JIANGNAN UNIV
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