N-(BiO)_2CO_3负载Pt的制备及其可见光下降解甲醛性能  

Preparation of N-(BiO)_2CO_3 supported Pt and degradation of formaldehyde under visible light irradiation

作　　者：王星[1] 李璞[1] 牟科全 曹文广 张婷 方正[1] WANG Xing;LI Pu;MU Ke-quan;CAO Wen-guang;ZHANG Ting;FANG Zheng(National Institute of Measurement and Testing Technology,Chengdu 610021,China)

机构地区：[1]中国测试技术研究院,四川成都610021

出　　处：《应用化工》2018年第11期2440-2443,共4页Applied Chemical Industry

基　　金：四川省科技计划项目(2017GZ0398)

摘　　要：以硝酸铋为Bi源,十六烷基三甲基溴化铵为N源,在常温下合成N-(Bi O)2CO3。以N-(Bi O)2CO3为载体,采用浸渍法在其表面沉积Pt。使用新型LED节能灯为光源,通过动态测试法考察了Pt@N-(Bi O)2CO3催化氧化甲醛行为。研究发现,相比于N-(Bi O)2CO3,负载Pt之后的材料在可见光下显示出更高的光催化活性。2%Pt@N-(Bi O)2CO3对初始浓度0. 72 mg/m3、流速820 m L/min的甲醛可以达到65. 2%的降解效率。采用XRD、TEM、HRTEM、UV-Vis对材料进行表征,结果显示,Pt的负载并没有改变N-(Bi O)2CO3的晶型和能带结构,说明Pt纳米粒子在催化反应中并非起共催化剂的作用,而是基于表面等离子共振效应,促进可见光的吸收,并将激发的电子转移到N-(Bi O)2CO3的导带,提高光催化效率。Bismuth nitrate was used as the source of Bi and cetyltrimethylammonium bromide as the source of N to synthesize N-(BiO)2CO3 at room temperature.Then Pt was deposited on the surface of N-(BiO)2CO3 by impregnation method.The catalytic activity of Pt@N-(BiO)2CO3 for formaldehyde oxidation was investigated by the dynamic test method using a new type of LED energy-saving lamp.The results show that:compared with N-(BiO)2CO3,the material after Pt loading showed higher photocatalytic activity under visible light irradiation.The degradation efficiency of 2%Pt@N-(BiO)2CO3 to formaldehyde with initial concentration of 0.72 mg/m^3 and flow rate of 820 mL/min can reach 65.2%.The results of XRD,TEM,HRTEM and UV-Vis DRS show that Pt does not change the crystal form and band structure of N-(BiO)2CO3,which indicates that the Pt nanoparticles do not act as cocatalyst in the catalytic reaction,but based on the surface plasmon resonance to promote the absorption of visible light and transfer the excited electrons to the conduction band of N-(BiO)2CO3 to improve the photocatalytic efficiency.

关 键 词：碳酸氧铋 氮掺杂 铂 可见光 甲醛降解 

分 类 号：TQ034[化学工程] TQ09