Cu-ZnO双反应中心类芬顿催化剂降解水中碘乙腈性能与机制  

Catalytic oxidation of iodoacetonitrile by Cu-ZnO dual-reaction center catalystin water and its mechanism

作　　者：刘豹 朱二帅 庄鹏宇 魏拓 郑兴[1] LIU Bao;ZHU Ershuai;ZHUANG Pengyu;WEI Tuo;ZHENG Xing(State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi′an University of Technology,Xi′an 710048,China;Power China Northwest Engineering of Corporation Limited,Xi′an 710065,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,西安710048 [2]中国电建集团西北勘测设计研究院有限公司,西安710065

出　　处：《环境工程学报》2023年第7期2158-2168,共11页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(52170053)。

摘　　要：多相芬顿催化虽然克服了均相芬顿pH适用范围窄,铁泥二次污染等问题,但还面临着稳定性差,H_(2)O_(2)利用率低的问题,从而限制了其实际应用。本文利用锌和铜的电负性差异制备了一种双反应中心催化剂Cu-ZnO,通过在催化剂表面构建贫富电子中心,从而诱导H_(2)O_(2)产生·OH降解污染物。采用TEM、EDS、XRD、FTIR、XPS以及EPR对催化剂进行表征,并研究了催化剂投加量、H_(2)O_(2)投加量、pH以及共存离子对碘乙腈降解效果的影响。结果表明,在催化剂投加量为1 g·L^(-1),双氧水投加量为10 mmol·L^(-1)时,Cu-ZnO对碘乙腈的去除率在91%。大部分共存离子对催化剂的降解效果影响较小,且在酸性条件下催化剂稳定性较好,中性和碱性条件下金属离子基本无释放。催化剂诱导产生的·OH和HO_(2)^(·)/O_(2)^(·-)是碘乙腈(IAN)降解的主要活性物种,降解产物包括CO_(2),H_(2)O,I^(-)和IO_(3)^(-)等。The practical application of heterogeneous Fenton catalysis was limited by the instability and inefficiency of H_(2)O_(2),even though which overcomes the problems such as narrow pH range and secondary pollution of iron sludge compared to homogeneous Fenton.In this study,a dual-reaction center catalyst Cu-ZnO was developed by taking advantage of the electronegativity difference between zinc and copper,and the rich and poor electron centers were constructed on the surface of the catalyst which could induce H_(2)O_(2)and produce•OH for pollutants degradation.The catalysts were characterized by TEM,EDS,XRD,FTIR,XPS and EPR,and the effects of dosage of catalyst and H_(2)O_(2),pH and coexisting ions on the degradation of iodoacetonitrile(IAN)were investigated.The results showed that 91%IAN was removed when the dosages of catalyst and H_(2)O_(2)were 1 g·L^(-1)and 10 mM,respectively.Most coexisting ions had slight effects on IAN degradation by Cu-ZnO which showed a better stability under acidic conditions,and no metal ions released at neutral and basic pHs.•OH and HO_(2)^(•)/O_(2)^(•−)induced by catalyst are the main active species for IAN degradation,the degradation products included CO_(2),H_(2)O,I^(-),IO_(3)^(-)and other organic products.

关 键 词：多相芬顿 双反应中心 碘乙腈 过氧化氢 

分 类 号：X703[环境科学与工程—环境工程]