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A composite catalyst for degrading organic chlorine pollutants and its preparation method

A composite catalyst and pollutant technology, applied in physical/chemical process catalysts, water pollutants, chemical instruments and methods, etc., can solve the problems of high purity of nano-zero valent iron, high technical equipment requirements, poor agglomeration performance, etc. Low equipment requirements, guaranteed degradation rate, and less agglomeration

Active Publication Date: 2019-08-30
SICHUAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nano-zero-valent iron prepared by this method has high purity, small particle size, good crystal structure, and easy to control particle size, but the agglomeration performance is poor, the requirements for technical equipment are high, and the operation is dangerous.

Method used

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  • A composite catalyst for degrading organic chlorine pollutants and its preparation method
  • A composite catalyst for degrading organic chlorine pollutants and its preparation method
  • A composite catalyst for degrading organic chlorine pollutants and its preparation method

Examples

Experimental program
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Effect test

preparation example Construction

[0035] 1. Preparation of solution A: Take 30ml of absolute ethanol and add it to a 250ml Erlenmeyer flask, and put the Erlenmeyer flask into a 40°C water bath to heat and stir; slowly add 10ml of butyl titanate to the vigorously stirred Erlenmeyer flask , and then quickly add 3ml of glacial acetic acid and Fe(NO 3 ) 3 , keep stirring at 40°C for 30 minutes to prepare solution A, wherein the mass ratio of Ti to Fe is 0.05;

[0036] 2. Preparation of solution B: Take 10ml of absolute ethanol and 5ml of distilled water in a 50ml small beaker, then add hydrofluoric acid, adjust the pH to 2 with concentrated nitric acid, and make solution B, wherein the molar ratio of Ti to F is 0.01;

[0037] 3. Fe 3+ / F-TiO 2 Preparation of powder: Add solution B dropwise to solution A with vigorous stirring in a water bath at 40°C, age for 24 hours to obtain a gel, dry in an oven at 80°C, and roast in a vacuum at 100°C for 6 hours to obtain Fe 3+ / F-TiO 2 powder;

[0038] 4. Fe 0 / F-TiO ...

Embodiment 1

[0041] The influence of embodiment 1 calcining temperature on composite catalyst degradation performance

[0042] The calcination conditions were changed as shown in Table 1, and other steps were the same as the above preparation method, and 2,4,6-trichlorophenol was degraded according to the above method, and the effect of the composite catalyst on the degradation performance of organochlorine pollutants was studied.

[0043] Table 1 Degradation rate of composite catalyst under different calcination conditions

[0044]

[0045] As can be seen from the above table 1, under the vacuum condition limited by the present invention and the temperature of 100~400 DEG C, the degradation rate of the prepared composite catalyst to organic chlorine pollutants reaches more than 90%, but when the roasting conditions are changed, Decreasing or increasing the calcination temperature has a great influence on the degradation performance of the prepared composite catalyst, and its degradatio...

Embodiment 2

[0047] Embodiment 2 The influence of titanium-iron mass ratio on the degradation performance of composite catalyst

[0048] The mass ratio of titanium to iron was changed as shown in Table 2, and the other steps were the same as the above preparation method, and 2,4,6-trichlorophenol was degraded according to the above method, and the effect of the composite catalyst on the degradation performance of organochlorine pollutants was studied.

[0049] Table 2 Degradation rate of composite catalysts prepared with different titanium-iron mass ratios

[0050]

[0051] As can be seen from the above table 2, under the condition of 0.01~0.2 mass ratio of ferro-titanium limited by the present invention, the degradation rate of the prepared composite catalyst to organic chlorine pollutants reaches more than 90%, but when the mass ratio of ferro-titanium is changed When it is reduced, the degradation rate of the composite catalyst prepared by it to organic chlorine pollutants is reduced...

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Abstract

The invention provides a composite catalyst for degrading organic chlorine pollutants, which belongs to the technical field of degradation catalysts. The composite catalyst of the present invention is composed of F-TiO 2 Fe composed of zero-valent Fe 0 / F‑TiO 2 composite catalyst. The Fe 0 / F‑TiO 2 The composite catalyst is composed of raw materials including butyl titanate, ferric nitrate, and hydrofluoric acid, and uses the sol-gel method to convert Fe 3+ Metal ions supported on F‑TiO 2 It is prepared by drying, roasting and reduction. The present invention provides both F-TiO 2 Fe has photocatalytic oxidation performance and Fenton-like oxidation performance of zero-valent iron 0 / F‑TiO 2 A new composite catalyst, which has both photocatalytic and Fenton-like oxidation properties, enhances the catalytic decomposition ability of organochlorine pollutants, and the degradation rate of organochlorine pollutants can reach more than 90%.

Description

technical field [0001] The invention belongs to the technical field of degradation catalysts, in particular to a catalyst for degrading organic chlorine pollutants, in particular to a composite catalyst for degrading organic chlorine pollutants and a preparation method thereof. Background technique [0002] my country is the largest consumer and producer of organochlorine pesticides among developing countries. The pesticides produced and used in large quantities from the 1960s to the 1980s were mainly organochlorine pesticides. The extensive use of organochlorine pesticides not only brings environmental pollution, but also endangers human health. Because of their stable structure, biodegradability, and high residue in the environment, they enter human and animal bodies through bioaccumulation and food chains. , can accumulate in tissues such as liver and kidney. Because organochlorine pollutants are more fat-soluble, they accumulate the most in fat. Accumulated residual pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/135C02F1/30C02F101/36
CPCC02F1/30B01J27/135C02F2101/36B01J35/39
Inventor 赵仕林刘茜马骏李越唐飏马崇迪沈芳罗风廖洋
Owner SICHUAN NORMAL UNIV
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