CIESC Journal ›› 2018, Vol. 69 ›› Issue (5): 2250-2254.doi: 10.11949/j.issn.0438-1157.20171274

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Main active substances and useless consumption path of free radicals in Fe (Ⅱ)/H2O2 system during NO oxidation process

ZHAO Haiqian1, LIU Chenghao1, ZHOU Wei2, WANG Zhonghua1, QI Hanbing1, GAO Jihui2   

  1. 1. Institute of Civil Engineering & Architecture, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;
    2. College of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China
  • Received:2017-09-19 Revised:2017-12-13 Online:2018-05-05 Published:2018-01-16
  • Supported by:

    supported by the National Natural Science Foundation of China(51606036, 91434134) and Innovative Talents Training Plan for Youth Scholars in Heilongjiang Province (UNPYSCT-2016085).

Abstract:

Low utilization of H2O2 is a bottleneck in the application of Fe(Ⅱ)/H2O2 oxidation system. Free radicals useless consumption is one of the main reasons for the low utilization of H2O2. In this paper, the effect of H2O2 and various free radicals on oxidation of NO and the useless consumption pathways of the free radicals in Fe(Ⅱ)/H2O2 system were studied based on NO oxidation background. The results showed that the ability of directly oxidize NO by H2O2 was very weak. Although both ·OH and HO2· had the ability to oxidize NO, the oxidation ability of ·OH was greater than that of HO2·. In the process of NO oxidation, the vast majority of ·OH and HO2· was uselessly consumed through the rapid recombination of these two kinds of radicals, which seriously affected the utilization of H2O2. Therefore, simultaneous presence of both ·OH and HO2· radicals should be avoided when Fe(Ⅱ)/H2O2 system was adopted to degrade the pollutants.

Key words: Fe (Ⅱ)/H2O2 system, NO, active substance, useless consumption, ·OH

CLC Number: 

  • O643

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