一锅法制备磁性Ni-Ag纳米合金催化剂及其催化还原对硝基苯酚  

One-pot Synthesis of Magnetic Ni-Ag Nano-Alloy Catalyst and Its Application in Reduction of 4-Nitrophenol

作　　者：李越 谈发堂[1,2] 王维 乔学亮[1,2] 邱小林 LI Yue;TAN Fatang;WANG Wei;QIAO Xueliang;QIU Xiaolin(School of Materials Science and Engineering,Huazhong University of Science and Technology, Wuhan 430074,China;State Key Laboratory of Materials Processing and Die & Mould Technology,Wuhan 430074,China;Nanomaterials Research Center, Nanchang Institute of Technology,Nanchang 330013,China)

机构地区：[1]华中科技大学材料科学与工程学院,湖北武汉430074 [2]材料成形与模具技术国家重点实验室,湖北武汉430074 [3]南昌理工学院纳米材料研究中心,江西南昌330013

出　　处：《化学与生物工程》2019年第5期19-24,共6页Chemistry & Bioengineering

基　　金：国家重点基础研究发展计划项目(2009CB939705);中央高校基本科研业务费专项资金项目(2014TS022);武汉市科技局应用基础研究项目(2016060101010072)

摘　　要：采用液相共还原一锅法制备了不同[Ni]∶[Ag]比例的磁性Ni-Ag纳米合金催化剂。利用XRD、SEM、TEM表征了催化剂的物相和形貌,利用XPS测试了催化剂表面元素价态,采用SQUID分析了催化剂的磁学性能;以对硝基苯酚的催化还原反应作为模型反应,研究了[Ni]∶[Ag]比例对磁性Ni-Ag纳米合金催化剂催化性能的影响,并考察了其循环使用性能。结果表明,磁性Ni-Ag纳米合金催化剂由直径50 nm左右的Ni-Ag合金颗粒组成,催化还原对硝基苯酚的催化活性随Ag含量的增加先增强后减弱,[Ni]∶[Ag]=1∶1的催化剂催化性能最好。该Ni-Ag纳米合金催化剂的饱和磁化强度为15.43 emu·g^(-1),具有很好的磁学性能,可实现磁回收和循环利用,循环使用5次后依然保持高催化活性和稳定性。We prepared magnetic Ni-Ag nano-alloy catalysts with different ratios of [Ni]∶[Ag] by a one-pot liquid co-reduction method.Furthermore,we characterized the phase and morphology of the catalysts by XRD,SEM,and TEM,measured the valence state of the surface element of the catalysts by XPS,and analyzed the magnetic property by SQUID.Moreover,using the catalytic reduction of 4-nitrophenol as a model reaction,we studied the effects of the ratio of [Ni]∶[Ag] on the catalytic performance of Ni-Ag nano-alloy catalysts,and investigated the recycling performance.The results show that Ni-Ag nano-alloy catalyst consists of particles with a diameter of about 50 nm,and the catalytic activity firstly increases and then decreases with the increase of Ag content.Therein,the catalytic performance of catalyst with [Ni]∶[Ag]=1∶1 is the best.The saturation magnetization of the Ni-Ag nano-alloy catalyst is 15.43 emu·g^-1,which has good magnetic property and can be magnetically recyclable for reuse.After 5 times reuse,the nano-alloy catalyst still has high catalytic activity and stability.

关 键 词：Ni-Ag纳米合金 催化 对硝基苯酚 磁性 

分 类 号：TQ426.82[化学工程]