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Evaluation of cobalt oxide, copper oxide and their solid solutions as heterogeneous catalysts for Fenton-degradation of dye pollutants

机译：评价氧化钴，氧化铜及其固溶体作为染料污染物芬顿降解的异质催化剂

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摘要

A series of CoO, Co_(0.75)Cu_(0.25)O, Co_(0.5)Cu_(0.5)O and CuO nanoparticles were synthesized via the calcination of corresponding oxalates and further examined as catalysts for the heterogeneous Fenton reaction. The structures of the as-prepared oxides were characterized by field emission electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction. The catalytic activity of the oxides was evaluated by the degradation of Congo red. It was found that, among the four catalysts, Co_(0.5)Cu_(0.5)O showed the best catalytic performance. Subsequently, the effects of operating parameters including the substrate concentration, pH, H2O2 concentration and reaction temperature in the catalytic performance of the Co_(0.5)Cu_(0.5)O were systematically studied. Under optimized conditions of catalyst loading =200 mg L~(-1) , pollutant concentration =100 mg L~(-1) ,H2O2 concentration =3 wt%, temperature =30 °C and pH =9, the Co_(0.5)Cu_(0.5)O catalyst could completely degrade the Congo red within 60 min. The degradation products were analyzed by a liquid chromatography-mass spectrometer and the degradation pathway was revealed. To investigate the catalytic mechanism, the pH and concentrations of H2O2 and metal ions were monitored during the Fenton process. Mechanistic studies revealed that hydroxyl radicals and superoxide radicals derived from the activation of H2O2 molecules by metal centers were mainly responsible for the degradation of Congo red, and that copper ions played a critical role in the superior catalytic performance of the Co_(0.5)Cu_(0.5)O catalyst. The Co_(0.5)Cu_(0.5)O catalyst showed negligible metal leaching and outstanding recyclability, which are highly favorable for the practical application in the Fenton process.
机译：通过相应的草酸盐煅烧合成了一系列Co_（0.75）Cu_（0.25）O，Co_（0.5）Cu_（0.5）o和CuO纳米颗粒，并进一步检查为非均相Fenton反应的催化剂。通过现场发射电子显微镜，透射电子显微镜，能量分散X射线光谱和X射线衍射的结构表征了制备氧化物的结构。通过刚果红色的降解评价氧化物的催化活性。结果发现，在四种催化剂中，CO_（0.5）Cu_（0.5）O显示出最佳的催化性能。随后，系统地研究了包括基材浓度，pH，H 2 O 2浓度和反应温度的操作参数的影响，在CO_（0.5）CU_（0.5）O的催化性能下进行了系统地进行了系统地研究。在催化剂负荷的优化条件下= 200mg L〜（-1），污染物浓度= 100mg L〜（-1），H 2 O 2浓度= 3wt％，温度= 30℃和pH = 9，CO_（0.5） Cu_（0.5）o催化剂可以在60分钟内完全降解刚果红色。通过液相色谱 - 质谱仪分析降解产物，并揭示了降解途径。为了研究催化机理，在FENTON工艺期间监测H 2 O 2和金属离子的pH和浓度。机械研究表明，通过金属中心激活H 2 O 2分子激活的羟基自由基和超氧化物主要负责刚果红色的降解，铜离子在CO_（0.5）CU_的优异催化性能中起着关键作用0.5）o催化剂。 CO_（0.5）CU_（0.5）催化剂显示出可忽略的金属浸出和出色的可回收性，这对FENTON过程中的实际应用非常有利。

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  • 来源
    《RSC Advances》 |2015年第111期|共9页
  • 作者

    Yi Shen; Zhihui Zhang; Kaijun Xiao;

  • 作者单位

    College of Light Industry and Food Sciences South China University of Technology Wushan Road Tianhe District Guangzhou 510640 China.;

    College of Light Industry and Food Sciences South China University of Technology Wushan Road Tianhe District Guangzhou 510640 China.;

    College of Light Industry and Food Sciences South China University of Technology Wushan Road Tianhe District Guangzhou 510640 China.;

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  • 正文语种 eng
  • 中图分类 化学;
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