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Fe-Mn double-metal heterogeneous Fenton catalyst taking molecular sieve as carrier as well as preparation method and application of catalyst

A heterogeneous Fenton and molecular sieve technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of non-reusable catalysts, secondary pollution of water bodies, and difficulty in recycling, etc. Applicable pH range, reduced dissolution level, and easy-to-control effects

Inactive Publication Date: 2014-12-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heterogeneous Fenton system that loads iron ions and other transition metal ions on certain media can effectively avoid the disadvantages of the homogeneous Fenton system. Secondary pollution, etc.

Method used

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  • Fe-Mn double-metal heterogeneous Fenton catalyst taking molecular sieve as carrier as well as preparation method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1, under stirring, mix 0.676gMnSO 4 ·H 2 O added to the 2.224gFeSO 4 ·7H 2 O and 200mL distilled water to prepare FeSO 4 ·7H 2 In O solution, the molar ratio of iron ions to manganese ions is 2:1, Fe 2+ and Mn 2+ The total ion concentration is 0.06mol / L, after stirring for 10min, FeSO 4 ·7H 2 O and MnSO 4 ·H 2 O mixed system;

[0023] Step 2, weigh 2.0g NaY molecular sieve and add it to the mixed system obtained in step 1, stir and mix evenly;

[0024] Step 3, take citric acid and join in the homogeneous mixing system of step 2 gained under agitation state, maintain Fe 2+ and Mn 2+ The ratio of the total ion concentration to the amount of the citric acid substance is 1:1, and ammonia water is added dropwise to the reaction solution during the stirring process to maintain the pH value of the reaction solution at about 8.0;

[0025] Step 4: react the reaction solution obtained in step 3 in a water bath at 60°C for 4 hours, then raise the temperature to 8...

Embodiment 2

[0027] Step 1, under stirring, mix 0.676gMnSO 4 ·H 2 O added to 1.112gFeSO 4 ·7H 2 O and 200mL distilled water to prepare FeSO 4 ·7H 2 In the O solution, the molar ratio of iron ions to manganese ions is 1:1, Fe 2+ and Mn 2+ The total ion concentration is 0.03mol / L, after stirring for 5min, FeSO 4 ·7H 2 O and MnSO 4 ·H 2 O mixed system;

[0028] Step 2, weigh 4.0g NaY molecular sieve and add to the mixed system obtained in step 1, stir and mix evenly;

[0029] Step 3, take citric acid and join in the homogeneous mixing system of step 2 gained under agitation state, maintain Fe 2+ and Mn 2+ The ratio of the total ion concentration to the amount of citric acid substance is 1:0.5, drip ammonia water in the reaction solution during the stirring process, and maintain the pH value of the reaction solution at about 7.0;

[0030] Step 4: react the reaction solution obtained in step 3 in a water bath at 50°C for 5 hours, then raise the temperature to 75°C for 3 hours, plac...

Embodiment 3

[0032] Step 1, under stirring, mix 0.676gMnSO 4 ·H 2 O added to 1.668gFeSO 4 ·7H 2 O and 200mL distilled water to prepare FeSO 4 ·7H 2 In the O solution, the molar ratio of iron ions to manganese ions is 1.5:1, Fe 2+ and Mn 2+The total ion concentration is 0.09mol / L, after stirring for 20min, FeSO 4 ·7H 2 O and MnSO 4 ·H 2 O mixed system;

[0033] Step 2, weigh 3.0g NaY molecular sieve and slowly add to the mixed system obtained in step 1, stir and mix evenly;

[0034] Step 3, take citric acid and join in the homogeneous mixing system of step 2 gained under agitation state, maintain Fe 2+ and Mn 2+ The ratio of the total ion concentration to the amount of citric acid substance is 1:2, and ammoniacal liquor is added dropwise to the reaction solution during the stirring process to maintain the pH value of the reaction solution at about 9.0;

[0035] Step 4: react the reaction solution obtained in step 3 in a water bath at 70°C for 3 hours, then raise the temperature...

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Abstract

The invention provides a Fe-Mn double-metal heterogeneous Fenton catalyst taking a molecular sieve as a carrier as well as a preparation method and application of the catalyst. The preparation method comprises the following steps: mixing a MnSO4.H2O solution and a FeSO4.7H2O solution to obtain a mixed system, adding a NaY molecular sieve into the mixed system, uniformly mixing, adding citric acid into the mixed system, carrying out water bath reaction, and drying and calcining viscous substance obtained after the reaction to obtain the Fe-Mn / NaY supported heterogeneous Fenton catalyst which is used for treating papermaking wastewater. The heterogeneous Fenton catalyst prepared by the method can be recycled and easily separated from the waste water; no chemical sludge is generated in the reaction system; the treatment cost is low; the technological process is simple and easy to control; the Fe-Mn double-metal heterogeneous Fenton catalyst has a relatively bright actual application prospect; the pH application range is widened; the dissolution level of iron ions can be reduced; the Fe-Mn double-metal heterogeneous Fenton catalyst can be recycled; by virtue of a synergistic effect of Fe-Mn double-metal ions, the catalytic reaction activity can be improved.

Description

technical field [0001] The invention relates to the technical field of environmental functional materials and wastewater treatment, and more specifically relates to a Fe-Mn bimetallic heterogeneous Fenton catalyst with a molecular sieve as a carrier and a preparation method and application thereof. Background technique [0002] Pulp and paper industry wastewater has the characteristics of large water volume, refractory organic matter, and large chroma. It has always been one of the most difficult wastewater in the field of industrial water treatment. After secondary biochemical treatment, the wastewater still has a high organic pollution load ( CODcr300-450mg / L, color 300-500 times). With the improvement of environmental protection standards and the need for energy saving and emission reduction, advanced treatment of pulp and paper wastewater has become necessary. At present, the advanced treatment methods of pulp and paper industry wastewater mainly include coagulation, ad...

Claims

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Application Information

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IPC IPC(8): B01J29/16C02F1/72C02F103/28
Inventor 王灿方帅潮保亭
Owner TIANJIN UNIV
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