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Open Access Effects of doping ions on the degradation of coal-mine gas via Fenton reagent

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The degradation of coal-mine gas with Fenton reagent is carried out through the oxidation reactions between methane and hydroxyl radicals (·OH) generated via the catalytic decomposition of H2O2 with Fe2+.In order to restrain the invalid decomposition and improve the efficiency of coal-mine gas degradation with Fenton reagent,the stability of Fenton reagents can be kept by doping hard-acid ions,such as Mg2+,Ca2+,and Na+,etc.The influence rules of Mg2+ on the stability of Fenton reagents,the apparent formation rate of ·OH and the degradation ratio of methane were systematically investigated.The experimental results demonstrate that the introduction of Mg2+ can effectively maintain the stability of Fenton reagents and improve the efficiency of gas degradation and ·OH formation via Fenton reagents.When 0.5 mmol/L of Mg2+ is added,the apparent formation rate of ·OH reaches to a maximum of 80.41% after 0.5 h.Meantime,the degradation percentage of coal-mine gas increases up to 40%,which is much higher than that obtained in the traditional Fenton system.Furthermore,by means of quantum chemistry theory,it is evidenced that the transmission process of chain reactions with Fenton reagents can be lengthened by decreasing the activity of peroxy-radicals (HOO·) via doping hard-acid ions.The special effect of hard-acid ions can decrease the ineffective decomposition of H2O2,promote the stability of Fenton reagents,and enhance the efficiency of apparent formation rate of  ·OH and degradation ratio of gas,which present the theoretical basis for the efficient degradation of coal-mine gas.
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Keywords: Fenton reagent; coal-mine gas degradation; doping ions; hydroxyl radical; quantum chemistry

Document Type: Research Article

Publication date: February 15, 2015

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  • The Journal publishes the peer-reviewed papers with original research, new developments and innovations, site measurements and case studies in coal science and mining industry. It aims to be a leading platform for the publication of high quality papers and an authoritative source of information for analysis, review and evaluation related to coal science and mining technologies.

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    The Journal is a unique comprehensive academic periodical completely dedicated to the coal science and mining industry in the world. The Journal stands out as an excellent source of scientific information in coal industry with nearly 400 papers published in 12 issues per annum.

    The Journal is published monthly by China Coal Society.
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