摘要
采用液相还原法制备了纳米Fe/Ni双金属材料,分析了其催化降解2,4-二氯酚的机理、降解过程中Ni的作用及相关参数变化。结果表明,2,4-二氯酚被纳米Fe/Ni降解的主要途径是2,4-二氯酚直接被脱去2个氯原子生成苯酚,此外也可先脱去一个氯原子生成2-氯酚或4-氯酚,然后继续脱氯生成苯酚;纳米Ni可将纳米Fe腐蚀产生的氢气转化为活性氢原子,活性氢原子再对2,4-二氯酚进行脱氯降解。在反应初期,溶液氧化还原电位及溶解氧浓度快速降低,pH及溶解铁浓度急剧升高,随着反应的进行,上述各参数值趋于稳定。
Nanoscale Fe/Ni bimetal was synthesized by liquid phase reduction method.The mechanism of 2,4-dichlorophenol catalytic degradation by nano-Fe/Ni,the role of nano-Ni and the change of related parameters in the degradation process were investigated.The results show that the main route of catalytic degradation of 2,4-dichlorophenol by nano-Fe/Ni is to remove 2 chlorine atoms simultaneously and directly reduce 2,4-dichlorophenol into phenol.In addition,2,4-dichlorophenol can be dechlorinated a chlorine atom to produce 2-chlorophenol and 4-chlorophenol at first,and then the dechlorination is performed sequentially to form phenol.Nano-Ni is used as a catalyst to convert hydrogen produced by nano-Fe corrosion into active hydrogen atom,which can achieve hydrodechlorination of 2,4-dichlorophenol.In the initial reaction period,the solution redox potential and dissolved oxygen concentration decrease rapidly while the pH and dissolved iron concentration increase sharply,and all the parameter values tend to be stable as the reaction progresses.
作者
刘红
王珺雯
阮霞
宁晓勇
范先媛
Liu Hong;Wang Junwen;Ruan Xia;Ning Xiaoyong;Fan Xianyuan(College of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan University of Science and Technology,Wuhan 430081,China)
出处
《武汉科技大学学报》
CAS
北大核心
2019年第6期449-455,共7页
Journal of Wuhan University of Science and Technology
基金
国家自然科学基金资助项目(41230638)
湖北省环保厅科研资助项目(2017HB08)
作者简介
刘红(1964-),女,武汉科技大学教授,博士生导师.E-mail:liuhong64@126.com。
