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Microwave-enhanced catalytic wet peroxide oxidation of quinoline: the influence of pH and H2O2 dosage and identification of reactive oxygen species

机译:喹啉的微波增强催化湿过氧化物氧化:pH与H2O2剂量的影响及反应性氧物种的鉴定

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摘要

This article presents a comprehensive study about the influence of initial pH and H2O2 dosage on quinoline mineralization efficiency (denoted by TOC abatement) by microwave-catalytic wet peroxide oxidation (MW-CWPO) with supported Cu-Ni bimetallic oxides as a catalyst and reactive oxygen identification on the basis of inhibition of quinoline mineralization using the specific radical scavengers. In an initial pH range from 2.0 to 8.0, this MW-CWPO was powerful, with the reaction at pH 7.0 obtaining the highest 81.12% TOC abatement under MW 500 W, H2O2 22.75 mmol L-1, Cu/Ni-catalyst 4 g L-1, and T 333 K. Five carboxylic acids, namely acetic acid, formic acid, succinic acid, oxalic acid, and glycolic acid, were quantified to elucidate the pH fall during mineralization under alkaline and neutral conditions. The experiments of reactive oxygen identification on the basis of inhibition of quinoline mineralization under the corresponding scavenger for (OH)-O-center dot and O-2(center dot-) exhibited (OH)-O-center dot and O-2(center dot-) immersed in supported bimetallic Cu/Ni oxides catalyzing MW-CWPO, and that (OH)-O-center dot was a direct product and O-2(center dot-) was a secondary oxidant produced from (OH)-O-center dot-involved reactions. Based on the results of stability and metal leaching experiments, it could be concluded that supported Cu-Ni bimetallic oxides could be a proper catalyst.
机译:本文介绍了初始pH和H2O2剂量对喹啉矿化效率(MW-CWPO)对喹啉矿化效率(MW-CWPO)的影响的综合研究,所述Cu-Ni双金属氧化物作为催化剂和反应性氧气基于喹啉矿化使用特定自由基清除剂的鉴定。在初始pH范围为2.0至8.0的范围内,该MW-CWPO是强大的,在pH7.0下反应获得MW 500W,H 2 O 2 22.75mmol L-1,Cu / Ni-Catalyst 4 G L的最高81.12%TOC削减。 -1和T 333 K. 5羧酸,即乙酸,甲酸,琥珀酸,草酸和乙醇酸,被定量阐明碱性和中性条件下矿化过程中的pH落下。在相应清除剂下喹啉矿化抑制的基于(OH)-O-中心点和O-2(中心点)的抑制反应性氧鉴定的实验(OH)-O-中心点和O-2(中心点浸入负载的双金属Cu / Ni氧化物催化MW-CWPO中,并且(OH)-O-中心点是直接产物,O-2(中心点)是由(OH)产生的二次氧化剂 - o中心点涉及的反应。基于稳定性和金属浸出实验的结果,可以得出结论,支持的Cu-Ni双金属氧化物可以是适当的催化剂。

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  • 来源
    《RSC Advances》 |2017年第24期|共7页
  • 作者

    Zhang Bo; You Hong; Wang Fei;

  • 作者单位

    Harbin Inst Technol Sch Municipal &

    Environm Engn State Key Lab Urban Water Resource &

    Environm 73 Huanghe Rd Harbin 150090 Peoples R China;

    Harbin Inst Technol Sch Municipal &

    Environm Engn State Key Lab Urban Water Resource &

    Environm 73 Huanghe Rd Harbin 150090 Peoples R China;

    Harbin Inst Technol Sch Municipal &

    Environm Engn State Key Lab Urban Water Resource &

    Environm 73 Huanghe Rd Harbin 150090 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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