超低负载量Au/g-C_(3)N_(4)@CeO_(2)室温催化去除甲醛性能  

Oxidative degradation of formaldehyde over g-C_(3)N_(4)@CeO_(2) catalyst with ultralow Au content at room temperature

作　　者：李琴[1] 严朝雄[1] 黄刚 石零[1] 徐志花[1] LI Qin;YAN Zhaoxiong;HUANG Gang;SHI Ling;XU Zhihua(Hubei Key Laboratory of Industrial Fume and Dust Pollution Control, Jianghan University,Wuhan 430056, China)

机构地区：[1]江汉大学工业烟尘污染控制湖北省重点实验室,武汉430056

出　　处：《功能材料》2021年第9期9208-9214,9220,共8页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(21871111);湖北省杰出青年基金资助项目(2019CFA078)。

摘　　要：采用简单的煅烧-浸渍法制备了g-C_(3)N_(4)@CeO_(2)负载低含量金(0.003%(质量分数)Au)复合催化剂(Au/g-C_(3)N_(4)@CeO_(2)),研究了制备过程中不同三聚氰胺使用量对复合催化剂室温催化氧化甲醛性能的影响。运用X射线衍射(XRD)、透射扫描电镜(TEM),傅里叶变换红外光谱仪(FTIR)、拉曼(Raman)、N2吸脱附和XPS等手段对所制备的催化剂进行了物化性质表征和分析。性能测试结果表明适当三聚氰胺使用量的Au/g-C_(3)N_(4)@CeO_(2)催化剂能将甲醛完全转化为二氧化碳和水,且甲醛去除率可达91.7%。原位红外结果表明甲酸盐和DOM是该催化反应的主要中间产物。该催化剂的优异性能主要归因于催化剂成分间的强相互作用、g-C_(3)N_(4)能够增大催化剂的比表面积和孔容而更有利于CeO_(2)和Au纳米颗粒的分散及CeO_(2)的存在促进了甲醛氧化反应的发生等因素。In this paper,low content gold(0.003 wt%Au)catalyst(Au/C_(3)N_(4)@CeO_(2))supported over C_(3)N_(4)@CeO_(2) is prepared by a simple calcination impregnation method.The effect of the amounts of melamine used in the preparation process on the performance of the composite catalyst for catalytic oxidation of formaldehyde at room temperature is studied.The catalysts are characterized and analyzed by X-ray diffraction(XRD),transmission scanning electron microscopy(TEM),Fourier transform infrared spectroscopy(FTIR),Raman,N2 sorption and X-ray photoelectron spectroscopy(XPS).The performance test results show that Au/C_(3)N_(4)@CeO_(2) could completely convert the formaldehyde into carbon dioxide and water with the removal efficiency of up to 91.7%.In situ diffuse reflectance infrared Fourier transform spectra show that formate and DOM are the main intermediate products in this catalytic reaction.The excellent performance of the catalyst is mainly attributed to the strong interaction between catalyst components,the specific surface area and pore volume of the catalyst can be increased by g-C_(3)N_(4),which is more conducive to the dispersion of CeO_(2) and Au nanoparticles,and the presence of CeO_(2) promotes the occurrence of formaldehyde oxidation reaction.

关 键 词：室温 催化氧化 甲醛 g-C_(3)N_(4)@CeO_(2) AU纳米粒子 

分 类 号：O643.36[理学—物理化学]