摘要
为解决TiO_2光催化纳米材料在使用过程中不易回收的问题,采用直接水解法成功制备了磁性核壳结构Fe_3O_4@TiO_2纳米材料,采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X-射线衍射仪(XRD)、傅里叶变换红外光谱仪(FT-IR)等对其物理化学特性进行了表征,并且考察了制备工艺条件,如钛酸四丁酯(TBOT)用量、氨水用量、反应温度、反应时间等因素对Fe_3O_4@TiO_2纳米颗粒光催化效果的影响。结果表明,TiO_2在Fe_3O_4颗粒表面进行了有效的包覆,形成了良好的包覆层,优化后制备工艺条件为:TBOT用量1.0 m L、氨水用量0.3 m L、制备温度85℃、制备时间4h,所得Fe_3O_4@TiO_2纳米材料对罗丹明B的催化降解效率明显提高,罗丹明B降解率达到98%。对负载前后纳米颗粒的磁滞回线进行测试发现,TiO_2的包覆并未明显减弱Fe_3O_4的磁性,所制备的可回收磁性Fe_3O_4@TiO_2催化剂具有良好的稳定性和重复利用性能。
To readily and efficiently recycle the photocatalysts has gained much attention in recent years.In this study, a magnetic core-shell Fe3O4@TiO2 nanocomposite was prepared by directly hydrolysis method. The effect of preparation parameters, such as titanium butoxide （TBOT） concentration, the am- monia amount, the reaction temperature and time, on their photocatalytic activity was investigated. The physicochemical properties of core-shell Fe3O4@TiO2 were characterized by series state-of-the-art instru-mentation techniques, including scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and Fourier transform infrared spectroscopy （FI＇-IR）. The characterization results showed that the core-shell structured Fe3O4@TiO2 nanoparticles were successfully synthesized by this feasible wet- chemistry method. The optimized preparation conditions can be well-controlled at the TBOT dosage of 1.0 mL, the ammonia amount of 0.3 mL, the preparation temperature of 85℃, and the preparation time of 4 h. The as-prepared Fe3O4@TiO2 showed high photocatalytic degradation efficiency （98%） for Rho- damine B （RhB）. It is important to point out that the reusability test demonstrated its high stability and effective recovery performance.
作者
王俊磊
朱宁芳
张娇静
王芳
程凯
王雪芹
WANG Junlei;ZHU Ningfang;ZHANG Jiaojing;WANG Fang;CHENG Kai;WANG Xueqin(School of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing 163318, China;Institute for Scientific Information, Pangang Group Research Institute Company Limited, Panzhihua 617000, China)
出处
《黑龙江大学自然科学学报》
CAS
2018年第2期180-187,共8页
Journal of Natural Science of Heilongjiang University
基金
国家自然科学基金资助项目(21276048)
黑龙江省自然科学基金资助项目(QC2017005)
黑龙江省博士后基金面上项目(LBHZ15032)
东北石油大学科研启动基金及校青年基金(NEPUBS201508)
