镍负载TiO2/聚乙烯亚胺/石墨烯纳米复合催化剂的制备及性能  

Preparation and Properties of Nickel-loaded Titanium Dioxide/Poly(ethylenimine)/Graphene Nanocomposite Catalyst

作　　者：苏策[1] 张红博 常开善 李思良[1] 李冠斌[1] SU Ce;ZHANG Hong-bo;CHANG Kai-shan;LI Si-liang;LI Guan-bin(College of Petro-Chemical Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China)

机构地区：[1]兰州理工大学石油化工学院

出　　处：《精细化工》2018年第9期1496-1503,共8页Fine Chemicals

基　　金：国家自然科学基金(21462025)~~

摘　　要：首先采用改进的Hummers法制备了氧化石墨烯（GO），再以聚乙烯亚胺（PEI）修饰的氧化石墨烯为载体，并以硫酸钛和氯化镍为前驱体，利用水热法在180℃下以PEI为交联剂制得镍负载的TiO2／PEI／石墨烯纳米复合催化剂（Ni-TiO2／PEI／RGO）。通过紫外-可见分光光度计（UV-vis）、傅里叶变换红外光谱（FTIR）、扫描电镜（SEM）、透射电镜（TEM）、X射线衍射（XRD）等测试手段对催化剂进行了表征。结果表明，Ni-TiO2／PEI／RGO纳米复合催化剂中镍负载TiO2纳米粒子与石墨烯能够均匀复合，并具有较小的晶粒尺寸，孔径分布主要在4～30nm，比表面积为241．77m2／g，镍的负载量为2．35％（质量分数），二氧化钛的负载量为17．46％（质量分数）。考察了该催化剂在NaBH4存在下对对硝基苯酚（4-NP）还原生成对氨基苯酚（4-AP）的催化活性。结果表明，使用Ni-TiO2／PEI／RGO催化剂4-NP降解率为98％，且催化剂重复使用9次后，4-NP降解率仍能保持90％以上。Graphene oxide （GO） was first prepared by an improved Hummers method and then modified with poly（ethylenimine） （PEI）. Finally, nickel-loaded titanium dioxide/PEI/RGO nanocomposite （Ni-TiO2/ PEI/RGO） was synthesized via a hydrothermal method at 180 ℃ using PEI modified GO as carrier, titanous sulfate and nickel chloride as precursor, PEI as linker. The prepared materials were characterized by UV-vis absorption spectrum （UV-vis）, Fourier transformed infrared spectroscopy （FTIR）, scanning electron microscope （SEM）, transmission electron microscope （TEM） and X-ray diffraction （XRD）. The results showed that uniformly dispersed Ni-loaded TiO2 nanoparticles were successfully loaded on the surface of graphene sheets and had smaller particle size. The particle distribution was mainly in the range from 4 to 30 nm, the specific surface area was 241.77 m2/g, the nickel loading （mass fraction, the same below） was 2.35%, and that of TiO2 was 17.46%. The catalytic reduction of 4-nitrophenol （4-NP） to 4-aminophenol （4-AP） was investigated in the presence of Ni-loaded TiO2/PEI/RGO nanocomposite and NaBH4. The results indicated that Ni-TiO2/PEI/RGO catalyst exhibited superior catalytic activity, the degradation efficiency of 4-NP was 98 % and still could remain over 90% even after recycling nine times.

关 键 词：石墨烯 PEI 镍负载的二氧化钛 水热法 4-NP 功能材料 

分 类 号：O643[理学—物理化学]