Method for preparing binary-oxide composite solid acid catalyst and method for treating degradation-resistant organic pollutants by catalyzing oxidization of H2O2

A H2O2, solid acid technology, applied in oxidation water/sewage treatment, water pollutants, water/sludge/sewage treatment, etc., can solve the problems of easy precipitation of catalysts, limited application scope, high chromaticity of wastewater, and achieve good Catalytic effect, saving acid and base, effect of simplifying process

Inactive Publication Date: 2013-10-23
JIANGNAN UNIV
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  • Abstract
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Problems solved by technology

However, some disadvantages of the homogeneous Fenton method make its application scope very limited: the reaction should be carried out under the environment of pH ≈ 3, and the pH value of the wastewater needs to be adjusted before and after the reaction, which requires a lot of acid and alkali; The chroma of wastewater is high; catalysts such as iron ions in the homogeneous system are easily precipitated, difficult to recover and prone to secondary pollution

Method used

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  • Method for preparing binary-oxide composite solid acid catalyst and method for treating degradation-resistant organic pollutants by catalyzing oxidization of H2O2
  • Method for preparing binary-oxide composite solid acid catalyst and method for treating degradation-resistant organic pollutants by catalyzing oxidization of H2O2
  • Method for preparing binary-oxide composite solid acid catalyst and method for treating degradation-resistant organic pollutants by catalyzing oxidization of H2O2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the mass ratio m(SnCl 4 .5H 2 O): m (diatomaceous earth) = 1: 3, weigh a certain amount of SnCl 4 .5H 2 O and diatomaceous earth, stir vigorously to mix, then 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 Sol. The product was 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 Washing with aqueous solution, centrifuging and settling, drying at 90°C, grinding and sieving with 80 meshes to obtain the precursor of tin-iron-silicon mixed oxide. 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 SFS1) . The particle size of the catalyst prepared by this method is about 100nm. The structure of the above samples was characterized by nitrogen adsorption, and the acid content wa...

Embodiment 2

[0025] Take 50mL of Cuilan dye wastewater and put them in 100mL beakers respectively, the initial COD concentration is 500mg / L, adjust the pH value to 3, 5, 7, 8.5 with hydrochloric acid and sodium hydroxide in turn, add 30% H 2 o 2 1mL / L and catalyst SFS13g / L, turn on the magnetic stirrer, take samples within the set time, and detect the COD, pH and chromaticity of the treated wastewater. The results are shown in Table 1. The results show that the method can be used in a wide range of pH, and the treatment effect is not affected when the pH value is between 3 and 8.5. And within a short period of time, the color removal rate can reach 100%, and the decolorization effect is very good. After the reaction, the pH value of the wastewater was around 3.

[0026] The influence of table 1 different initial pH on reaction effect

[0027]

[0028] Example 2

[0029] Take 50mL of methylene blue cationic dye simulated wastewater into 200mL beakers, the initial concentration is 10...

Embodiment 3

[0033]Take 50mL of simulated methyl orange anionic dye wastewater into 200mL beakers, the initial concentration is 200mg / L, do not adjust the initial pH value, turn on the magnetic stirrer, take samples at the set time of 15 minutes, and measure the methyl orange in the wastewater. Orange content and calculate the removal rate. The experimental results are shown in Table 3

[0034] Table 3 Catalyst treatment example of methyl orange wastewater

[0035]

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Abstract

The invention relates to a method for preparing a binary-oxide composite solid acid catalyst and a method for treating degradation-resistant organic pollutants by catalyzing oxidation of H2O2, belonging to the field of treatment and catalytic reaction of wastewater in environmental protection. The method for synthesizing the solid acid catalyst comprises the following steps: mixing SnCl4.5H2O with diatomaceous earth, adding Fe2(SO4)3 according to a certain mass ratio, and adjusting the pH value of the mixture by using strong aqueous ammonia to form sol; ageing, washing, settling centrifugally, drying, grinding and sieving the sol to obtain a precursor; and impregnating the precursor with sulfuric acids with different concentrations, filtering, drying and calcining to obtain the solid acid catalyst which takes a sulfate radical as an accelerator. The solid acid catalyst can form a heterogeneous Fenton system together with hydrogen peroxide to catalyze to generate a hydroxyl radical (.OH) for degrading pollutants and can be used for degrading the methylene-blue simulated wastewater, the methyl-orange simulated wastewater, the m-nitrobenzene simulated wastewater, the turquoise-blue real wastewater, the glyphosate real wastewater and the pharmaceutical-intermediate real wastewater quickly and effectively without adjusting the pH value of the wastewater and generating iron sludge, and thus fewer reagents are used. The solid acid catalyst has a strong sedimentation performance and can be recycled.

Description

technical field [0001] The invention relates to the application of a metal oxide composite 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] At present, the rapid development of industry has produced a large amount of high-content, toxic, harmful and refractory organic wastewater, especially the development of pharmaceutical, chemical and dye industries, which has made more and more high-content refractory wastewater, and their treatment has become A major difficulty in wastewater treatment. At present, biological technology is widely used for treatment, but this kind of wastewater usually has high COD and BOD 5 / COD is generally lower than 0.1, which limits biological treatment methods. Therefore, the development of an effective organic wastewater treatment process has received widespread attention from all o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/835C02F1/72C02F101/30
Inventor 陈新毛明星刘瑛商少明董玉明高海燕
Owner JIANGNAN UNIV
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