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
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[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 ...
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 temp...
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 t...
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