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
2 Cites 12 Cited by

AI-Extracted Technical Summary

Problems solved by technology

The heterogeneous Fenton system that loads iron ions and other transition metal ions on certain media...
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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.

Application Domain

Molecular sieve catalystsWaste water treatment from plant processing +1

Technology Topic

IonMolecular sieve +9

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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(5)

Example Embodiment

[0021] Example 1
[0022] Step 1. Under stirring, add 0.676g MnSO 4 ·H 2 O is added to 2.224gFeSO 4 ·7H 2 FeSO made of O and 200mL distilled water 4 ·7H 2 In O solution, the molar ratio of iron ion to manganese ion is 2:1, Fe 2+ And Mn 2+ The total ion concentration is 0.06mol/L, FeSO is obtained after stirring for 10min 4 ·7H 2 O and MnSO 4 ·H 2 O mixed system;
[0023] Step 2. Weigh 2.0g of NaY molecular sieve and add it to the mixing system obtained in Step 1, stir and mix evenly;
[0024] Step 3. Weigh citric acid and add it to the homogeneous mixing system obtained in step 2 under stirring to maintain Fe 2+ And Mn 2+ The ratio of the total ion concentration to the amount of 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. After reacting the reaction solution obtained in step 3 in a water bath at 60°C for 4 hours, the temperature is raised to 80°C for 2 hours, and the viscous material obtained from the reaction is dried in a drying oven at 110°C for 12 hours, and finally calcined at 400°C After 4h, Fe-Mn/NaY supported heterogeneous Fenton catalyst can be obtained.

Example Embodiment

[0026] Example 2
[0027] Step 1. Under stirring, add 0.676g MnSO 4 ·H 2 O is added to from 1.112gFeSO 4 ·7H 2 FeSO made of O and 200mL distilled water 4 ·7H 2 In O solution, the molar ratio of iron ion to manganese ion is 1:1, Fe 2+ And Mn 2+ The total ion concentration is 0.03mol/L, FeSO is obtained after stirring for 5 minutes 4 ·7H 2 O and MnSO 4 ·H 2 O mixed system;
[0028] Step 2. Weigh 4.0g of NaY molecular sieve and add it to the mixing system obtained in Step 1, stir and mix evenly;
[0029] Step 3. Weigh citric acid and add it to the homogeneous mixing system obtained in step 2 under stirring to maintain Fe 2+ And Mn 2+ The ratio of the total ion concentration to the amount of citric acid substance is 1:0.5, 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 7.0;
[0030] Step 4. After reacting the reaction solution obtained in step 3 in a water bath at 50°C for 5 hours, the temperature is raised to 75°C for 3 hours, and the viscous material obtained from the reaction is placed in a drying oven at 100°C for 14 hours, and finally calcined at 600°C After 3h, Fe-Mn/NaY supported heterogeneous Fenton catalyst can be obtained.

Example Embodiment

[0031] Example 3
[0032] Step 1. Under stirring, add 0.676g MnSO 4 ·H 2 O is added to from 1.668gFeSO 4 ·7H 2 FeSO made of O and 200mL distilled water 4 ·7H 2 In O solution, the molar ratio of iron ion to manganese ion is 1.5:1, Fe 2+ And Mn 2+ The total ion concentration is 0.09mol/L, FeSO is obtained after stirring for 20min 4 ·7H 2 O and MnSO 4 ·H 2 O mixed system;
[0033] Step 2. Weigh 3.0g of NaY molecular sieve and slowly add it to the mixing system obtained in Step 1, stir and mix evenly;
[0034] Step 3. Weigh citric acid and add it to the homogeneous mixing system obtained in step 2 under stirring to maintain Fe 2+ And Mn 2+ The ratio of the total ion concentration to the amount of citric acid substance is 1:2, 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 9.0;
[0035] Step 4. After reacting the reaction solution obtained in step 3 in a water bath at 70°C for 3 hours, the temperature is increased to 90°C for 1.5 hours, and the viscous material obtained from the reaction is placed in a drying oven at a temperature of 120°C for 10 hours, and finally at 500°C After calcination for 2h, Fe-Mn/NaY supported heterogeneous Fenton catalyst can be obtained.
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