核壳型磁性纳米复合材料Fe_(3)O_(4)@SiO_(2)@mTiO_(2)@Pt的制备及催化性能  

Preparation and catalytic properties of Fe_(3)O_(4)@SiO_(2)@mTiO_(2)@Pt magnetic nanocomposite catalyst with core shell structure

作　　者：郑锦丽 葛红光[1] 马书婷 李宗林 郭少波 史娟[1] 欧婷 ZHENG Jinli;GE Hongguang;MA Shuting;LI Zonglin;GUO Shaobo;SHI Juan;OU Ting(School of Chemistry and Environmental Science, Shaanxi University of Technology, Hanzhong 723000, China)

机构地区：[1]陕西理工大学化学与环境科学学院,陕西汉中723000

出　　处：《功能材料》2022年第1期1064-1071,1076,共9页Journal of Functional Materials

基　　金：陕西省教育厅科技计划项目(21JK0574);陕西省科技厅自然科学研究项目(2019JM-545);陕西省重点研发计划工业领域项目(2020ZDLGY11-02);陕西理工大学秦巴生物资源与生态环境国家重点实验室(培育)“市校共建”科研专项(SXJ-2106);陕西理工大学校级研究生创新基金项目(SLGYCX2121)。

摘　　要：采用溶剂热法制备磁性Fe_(3)O_(4)粒子。碱性条件下,以Fe_(3)O_(4)为核采用Stöber法和溶胶-凝胶法在其表面依次包覆SiO_(2)和介孔(m)TiO_(2),通过3-氨丙基三甲氧基硅烷(APTES)对其表面修饰后,采用乙二醇的多羟基还原性,将Pt原位还原负载在Fe_(3)O_(4)@SiO_(2)@mTiO_(2)表面合成核壳型磁性纳米复合材料Fe_(3)O_(4)@SiO_(2)@mTiO_(2)@Pt。通过透射电子显微镜(TEM)、X射线粉末衍射仪(XRD)、紫外可见分光光度计(UV-Vis)、振动样品磁强计(VSM)及X射线光电子能谱分析仪(XPS)对样品的微观形貌、结构、磁性、元素组成等进行表征。以对硝基苯酚(4-NP)和罗丹明6G为目标污染物,研究Fe_(3)O_(4)@SiO_(2)@mTiO_(2)@Pt在硼氢化钠介质中加氢还原的催化活性并探讨其催化机制。结果表明,在20 min内,4-NP降解率达99.50%,30 min内,罗丹明6G降解率达99.00%。Magnetic Fe_(3)O_(4) particles are prepared by solvothermal method.Under alkaline conditions,Fe_(3)O_(4) is used as the core to coat SiO_(2) and mesoporous(m)TiO_(2) on the surface successively by using the Stöber method and the sol-gel method.Through 3-aminopropyltrimethoxysilane(APTES)modified,the polyhydroxyl reducibility of ethylene glycol is used to reduce the Pt in situ on the surface of Fe_(3)O_(4)@SiO_(2)@mTiO_(2) to synthesize core shell magnetic nanocomposite Fe_(3)O_(4)@SiO_(2)@mTiO_(2)@Pt.The microscopic morphology,structure,magnetism,and element composition of the samples are characterized by transmission electron microscope(TEM),X-ray powder diffractometer(XRD),ultraviolet-visible spectrophotometer(UV-Vis),vibrating sample magnetometer(VSM)and X-ray photoelectron spectroscopy(XPS).Taking p-nitrophenol(4-NP)and rhodamine 6G as target pollutants,the catalytic activity of Fe_(3)O_(4)@SiO_(2)@mTiO_(2)@Pt in the hydrogenation reduction of sodium borohydride medium is investigated and its catalytic mechanism is discussed.The results show that the degradation rate of 4-NP reaches 99.50%within 20 min and the degradation rate of rhodamine 6G reaches 99.00%within 30 minutes.

关 键 词：磁性复合材料 PT纳米粒子 介孔结构 催化 降解 

分 类 号：O643.36[理学—物理化学]