Method for improving nanometer zero-valent zinc catalysis activity
A catalytic activity, zero-valent zinc technology, applied in the application field of new modified catalysts, can solve the problem of low catalytic activity of zero-valent zinc, and achieve the effects of enhanced catalytic activity, protection of the natural environment, and simple preparation process
Inactive Publication Date: 2017-06-20
UNIV OF SHANGHAI FOR SCI & TECH
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[0005] The purpose of the present invention is to solve the low defect of the catalytic activity of zero-valent zinc in the prior art, provide a kind of method that improves nano-zero-valent zinc catalytic activity, the catalytic activity of the nano-zero-valent zinc prepared by this method strengthens, Therefore, the degradation rate of high-concentration and high-pollution organic pollutants can be significantly improved, and the method is simple in process and has the advantages of high catalytic efficiency, low energy consumption, environmental protection and no pollution
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[0015] Take four commercial zinc powders with a purity of 95%, and perform mechanical activation on three of them for 7 hours, 9 hours, and 11 hours respectively. During the activation process, stop the machine for 30 minutes after every 2 hours for stress release, and obtain different nanometer sizes. Nanoscale zero-valent zinc with different activation energies, the grain size is between 10-200 nm, and its microscopic residual stress is between -0.628×10 -3 to 2.120×10 -3 Among them, the positive value represents the tensile stress, and the negative value represents the compressive stress.
[0016] The other one was not subjected to mechanical excitation, and other operations were the same as the above three zinc powder operations, and served as a control group.
[0017] Take the simulated organic pollutant solution and divide it into four equal parts. Three parts of nano-zero-valent zinc obtained above were placed in three simulated organic pollutant solutions, and the co...
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Abstract
The invention relates to a method for improving the nanometer zero-valent zinc catalysis activity. The method can be used for performing catalytic degradation on high-concentration high-pollution organic contaminants. The invention aims at providing the method for improving the nanometer zero-valent zinc catalysis activity. The catalysis activity of nanometer zero-valent zinc prepared by the method is enhanced, so that the degradation rate on the high-concentration high-pollution organic contaminants can be obviously improved; in addition, the process of the method is simple; the method has the advantages that the catalysis efficiency is high; the energy consumption is low; the environment is protected; no pollution is caused. The method for improving the nanometer zero-valent zinc catalysis activity is characterized in that zinc powder is put into a rolling pressing vibration mill to be ground for 3 to 15 hours; in the grinding process, the machine halt is performed for 0.5 to 1 hour every 1 to 2 hours for stress release; the zero-valent zinc is obtained; the crystal particle diameter of the nanometer zero-valent zinc is between 10nm and 200nm; the microscopic residue stress is between 0.628*10<3> and 2.120*10<3>, wherein the positive value represents the tension stress; the negative value represents the pressure stress.
Description
technical field [0001] The invention belongs to the application technical field of novel modified catalysts. Specifically, the invention relates to a method for improving the catalytic activity of nanometer zero-valent zinc, which can be used for catalytic degradation of high-concentration and high-pollution organic pollutants. Background technique [0002] The total length of rivers and rivers in my country is 420,000 kilometers, the lakes are 75,600 square kilometers, and the total water resources are 2.8 trillion cubic meters. However, due to my country's huge population base, the per capita fresh water volume is only 2,300 cubic meters, accounting for 1 / 4 of the world's per capita possession, ranking 121st and one of the 13 water-poor countries in the world. The few water resources are still severely polluted in the process of industrialization in my country. According to the survey, 82% of the rivers and lakes in the country are polluted to varying degrees, resulting in...
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IPC IPC(8): B01J23/06C02F1/70B22F1/00C02F101/30C02F101/38
CPCC02F1/705B01J23/06C02F2101/40C02F2101/38C02F2101/308B22F1/14B22F1/054B01J35/40
Inventor 李生娟任光鹏王树林李应涛索路路
Owner UNIV OF SHANGHAI FOR SCI & TECH