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Novel mesoporous Fe2O3-SnO2-ZSM-5 solid acid prepared by impregnation method, and application study for catalyzing degradation of organic pollutants

A solid acid, H2O2 technology, applied in molecular sieve catalyst, catalyst activation/preparation, oxidized water/sewage treatment and other directions, can solve the problems of increasing COD and chromaticity of wastewater, secondary pollution, difficult continuous production, etc., to simplify the process, Cost saving, good response effect

Inactive Publication Date: 2013-06-19
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, Fenton reagent needs to be carried out under acidic conditions when treating wastewater, and the equipment is corroded, so it is difficult to realize continuous production in technology, and the catalyst is not easy to separate from raw materials and products; and H 2 o 2 and OH utilization rate is still low, excess Fe 2+ The addition of will increase the COD and chroma in the treated wastewater and cause secondary pollution

Method used

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  • Novel mesoporous Fe2O3-SnO2-ZSM-5 solid acid prepared by impregnation method, and application study for catalyzing degradation of organic pollutants
  • Novel mesoporous Fe2O3-SnO2-ZSM-5 solid acid prepared by impregnation method, and application study for catalyzing degradation of organic pollutants
  • Novel mesoporous Fe2O3-SnO2-ZSM-5 solid acid prepared by impregnation method, and application study for catalyzing degradation of organic pollutants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to a certain proportion, the SnCl 4 .5H 2 Stir and mix O aqueous solution and dried molecular sieve, wherein the amount of molecular sieve is 2%-8% of the total mass, according to n(Sn):n(Fe)=4:1, add a certain amount of Fe 2 (SO 4 ) 3 , adjust pH=6 with concentrated ammonia water to form Sn(OH) 4 and Fe(OH) 3 precipitation. The product is immersed and aged in a water bath at 70°C for 12 hours, and then added with 0.1-0.75mol / L (NH 4 ) 2 CO 3 After washing with aqueous solution, centrifugal sedimentation, drying at 90°C, grinding and sieving with 80 meshes, the mixed oxide precursor was obtained. The precursor is impregnated with 0.25-3mol / L sulfuric acid, filtered, dried at 60-120°C, and roasted at 200-500°C for 3 hours to obtain a tin-iron-silicon solid acid with sulfate as a promoter (hereinafter referred to as SFZ1) .

Embodiment 2

[0023] Take 50mL of emerald blue dye wastewater with an initial COD concentration of 500mg / L, adjust the pH value to 3, 5, 7, and 9 with hydrochloric acid and sodium hydroxide in turn, and add 30% H 2 o 2 1mL / L and catalyst SFZ10.35g / L, stirring, sampling, detection of COD, pH value and chromaticity of the treated wastewater, see Table 1.

[0024] The influence of table 1 different initial pH on reaction effect

[0025]

Embodiment 3

[0027] Take 25mL of Cuilan actual wastewater, the initial COD concentration is 20000mg / L, without adjusting the pH, use SFZ1 to study the degradation effect of high-concentration pollutants, the results are shown in Table 2

[0028] The impact of table 2 SFZ1 adding amount on reaction effect

[0029]

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PUM

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Abstract

The invention relates to a multi-component composite solid acid formed by using a mesoporous molecular sieve as a carrier of a solid acid catalyst and introducing other metal oxides by an impregnation method, with stannum oxide and ferric oxide as accelerators. During synthesis, firstly, a SnCl4.5H2O water solution and the mesoporous molecular sieve are mixed with stirring; then, a certain ratio of Fe2(SO4)3 is added to the above mixture; and concentrated ammonia water is used to adjust pH, so as to obtain a precipitate; a product is impregnated, sedimentated through centrifugation, dried, grinded and screened to obtain a mixed oxide precursor; the precursor is impregnated by sulfuric acids with different concentrations, filtered, dried and calcined in a muffle furnace at a high temperature to obtain a stannum-ferrum-silicon solid acid (abbreviated SFZ1) with sulfate radicals as an accelerator; and a heterogeneous Fenton-like system is formed by using the obtained SFZ1 catalyst and hydrogen peroxide and catalyzes the hydrogen peroxide to produce hydroxyl radicals (?OH) with extremely strong oxidizability to perform efficient and rapid degradation on the pollutants. The catalyst can rapidly and effectively degrade imitated wastewater of methylene blue, methyl orange and nitrobenzene wastewater and real wastewater of turquoise blue, glyphosate and pharmaceutical intermediates, is in no need of adjusting the pH value of the wastewater, is very few in reagent usage amount, does not produce ferrum sludge, has extremely strong sedimentation performance and can be recycled for reuse.

Description

technical field [0001] The invention relates to the application of a metal oxide composite mesoporous solid acid catalyst in a Fenton-like reaction. Wastewater treatment in the field of environmental protection. It is technically involved in the fields of catalytic reaction and so on. Background technique [0002] In recent years, organic pollutants such as pesticides and organic dyes have caused serious environmental pollution problems, and they are characterized by high toxicity and difficult biodegradation. However, at present, Fenton reagent needs to be carried out under acidic conditions when treating wastewater, and the equipment is corroded, so it is difficult to realize continuous production in technology, and the catalyst is not easy to separate from raw materials and products; and H 2 o 2 and OH utilization rate is still low, excess Fe 2+ The addition of will increase the COD and chroma in the treated wastewater and cause secondary pollution. Using solid inorg...

Claims

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Application Information

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IPC IPC(8): B01J29/46B01J37/02C02F1/72
Inventor 陈新刘瑛毛明星耿文豪
Owner JIANGNAN UNIV
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