超分子水凝胶原位制备纳米镍及其在对硝基苯酚催化还原中的应用  

Preparation of nickel nanoparticles in supramolecular hydrogels and application in catalytic reduction of 4-nitrophenol

作　　者：张以民 刘洋 陈侣 张雄志 ZHANG Yi-min;LIU Yang;CHEN Lv;ZHANG Xiong-zhi(School of Chemistry and Chemical Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学化学与化工学院,湖北武汉430081 [2]武汉科技大学耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《现代化工》2022年第6期124-128,134,共6页Modern Chemical Industry

基　　金：国家自然科学基金青年项目(Nos.21801199);湖北省大学生创新创业训练计划项目(S202010488004)。

摘　　要：在超分子水凝胶中负载Ni^(2+),再添加NaBH_(4)原位还原制备得到纳米镍。利用EDS、SEM、TEM及流变等方法对复合催化剂进行结构和性能表征,结果发现纳米镍尺寸约为5~10 nm,均匀分散于水凝胶中,复合催化剂具有良好的自修复能力。利用UV-Vis研究了其在催化还原4-NP中的性能,通过对反应随时间的变化及在不同温度下的催化性能研究发现,该反应动力学数据符合一级反应特征,表观速率常数与反应温度呈线性关系,催化剂重复使用6次后仍然保持了良好的催化性能。Ni nanoparticles are obtained through in-situ reduction of Ni^(2+)by NaBH_(4)within supramolecular hydrogels.The structures and properties of the composite catalysts are characterized by EDS,SEM,TEM and rheological method.It is found out that Ni nanoparticles have a size of 5-10 nm,and disperse homogeneously in 3 D hydrogel matrix.The composite catalysts behave self-healing property.The performance of the composite catalysts in catalytic reduction of 4-nitrophenol are studied by means of UV-Vis spectroscopy,and the impact of reaction time and temperature on the catalytic performance are also studied.Results show that the reaction kinetic data accord with the pseudo-first order reaction,there is linear relationship between apparent rate constant and reaction temperature.The composite catalysts still maintain good catalytic performance after being reused for 6 times.

关 键 词：纳米镍 超分子水凝胶 催化剂 自修复 4-硝基苯酚 

分 类 号：TB321[一般工业技术—材料科学与工程]