基于聚苯胺纤维素纳米纤维的磁组装电极电化学氧化处理酸性红G废水研究  

Study on electrochemical oxidation of acid red G wastewater by magnetically assembled electrode based on polyaniline cellulose nanofibers

作　　者：杨长安[1] 赵伟鹏 邵丹 YANG Chang-an;ZHAO Wei-peng;SHAO Dan(School of Materials Science and Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China)

机构地区：[1]陕西科技大学材料科学与工程学院,陕西西安710021

出　　处：《陕西科技大学学报》2022年第5期93-99,共7页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(21706153);陕西科技大学博士科研启动基金项目(2017BJ-26)。

摘　　要：难降解有机废水污染治理是关系国计民生的焦点问题,电化学氧化法因其清洁、高效、灵活等特点在众多废水处理技术中备受关注.阳极是电化学氧化法的核心,决定了这项技术的效率与成本.近年来,随着阳极材料的发展,出现了一种在形式上介于传统二维电极和三维电极之间的新型阳极形式,即磁组装电极(Magnetically Assembled Electrode,MAE).其本质是一种模块化电极,利用磁铁将具有磁性的副电极材料吸附于二维主电极上,赋予电极大量的催化活性位点,并使电极具有多样性、性能灵活可调性以及良好的可回收性,具有稳定高效处理动态废水的潜力.采用薄片状磁性纤维素纳米纤维聚苯胺复合材料(CNFs/PANI)作为副电极,以典型DSA电极Ti/PbO_(2)作为主电极,将吸附剂与电催化剂相结合,构建具有良好偶氮染料吸附与降解性能的新型MAE,以提高偶氮染料废水处理效率.以典型偶氮染料酸性红G为目标物,考察新型MAE的各项电化学性能与酸性红G模拟废水的降解效果.研究结果表明,相比于传统二维Ti/PbO_(2)阳极,新型MAE具有较多的吸附—催化活性位点与较高的电催化活性,由于酸性红G易于向新型MAE表面富集,即使在降解过程后期染料浓度下降时,新型MAE仍能能保持较高的染料降解效率.The treatment of refractory organic wastewater pollution is a focus issue related to the national economy and the people′s livelihood.Electrochemical oxidation has attracted much attention in many wastewater treatment technologies because of its clean,efficient and flexible characteristics.Anode is the core of electrochemical oxidation,which determines the efficiency and cost of this technology.In recent years,with the development of anode materials,a new anode form,Magnetically Assembled Electrode(MAE),has emerged,which is between the traditional two-dimensional electrode and three-dimensional electrode.Its essence is a modular electrode,which uses a magnet to adsorb the magnetic sub electrode material on the two-dimensional main electrode,endows the electrode with a large number of catalytic active sites,makes the electrode have diversity,flexible and adjustable performance and good recyclability,and has the potential of stable and efficient treatment of dynamic wastewater.In this paper,flake magnetic cellulose nanofiber polyaniline composites(CNFs/PANI)are used as secondary electrode,typical DSA electrode Ti/PbO_(2) is used as main electrode,and a new MAE with good adsorption and degradation properties of azo dyes is constructed by combining adsorbent and electrocatalyst,so as to improve the efficiency of azo dye wastewater treatment.Taking the typical azo dye acid red g as the target,the electrochemical properties of the new MAE and the degradation effect of acid red g simulated wastewater were investigated.The results show that compared with the traditional two-dimensional Ti/PbO_(2) anode,the new MAE has more adsorption catalytic active sites and higher electrocatalytic activity.Due to the easy enrichment of acid red g to the surface of the new MAE,the new MAE can maintain high dye degradation efficiency even when the dye concentration decreases in the later stage of the degradation process.

关 键 词：磁组装电极 电化学水处理 难降解有机污染物 聚苯胺 二氧化铅阳极 

分 类 号：TQ150.9[化学工程—电化学工业]