表面铂改性对二氧化钛纳米管光催化降解甲胺性能的影响  

Effects of surface Pt modification on titanium nanotubes for photocatalytic methylamine oxidation

作　　者：段泽宇 周易 陈心茹 钟奥 王海强[1] 吴忠标[1] DUAN Zeyu;ZHOU Yi;CHEN Xinru;ZHONG Ao;WANG Haiqiang;WU Zhongbiao(College of Environmental and Resource Sciences,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学环境与资源学院,浙江杭州310058

出　　处：《能源环境保护》2024年第4期179-188,共10页Energy Environmental Protection

基　　金：国家重点研发计划资助项目(2022YFC3702000);国家自然科学基金资助项目(NSFC-51978603);杭州市钱江特聘专家项目;浙江省重点科技创新团队计划(2013TD07)。

摘　　要：采用浸渍法、沉淀-煅烧法和光沉积法,分别制备了PtCl_(x)、PtO_(x)和Pt^(0)改性的二氧化钛纳米管(TNTs)材料,并将其应用于甲胺的光催化降解。研究结果表明,0.5%PtCl_(x)/TNTs催化剂的甲胺光催化降解性能最佳,光催化效率可达95%,连续运行6 h后仍保持92%以上的降解率。通过进行XRD、TEM、BET、XPS、UV-Vis DRS、PL和ESR表征,探究了不同化学态Pt对TNTs在光催化降解甲胺反应中性能的影响。当Pt以PtO_(x)和Pt^(0)的形式负载在TNTs上时,虽然样品的光吸收和载流子分离性能得到了增强,但对甲胺在催化剂表面的吸附过程产生了不利影响,从而阻碍了甲胺的光催化氧化过程。只有当Pt以PtCl_(x)的形式负载在TNTs上时,才能构建新的Pt(III)-Pt(IV)电子转移通道,从而显著提高甲胺的光催化降解性能。In this study,PtCl_(x),PtO_(x)and Pt^(0)modified titanium dioxide nanotubes(TNTs)materials were prepared by impregnation,precipitation-calcination and photodeposition methods,and were applied to the photocatalytic degradation of methylamine.The results showed that the 0.5%PtCl_(x)/TNTs catalysts exhibited the best performance in the photocatalytic degradation of methylamine,with a photocatalytic efficiency of up to 95%,which remained over 92%after 6 h continuous operation.The effects of different chemical states of Pt on the performance of TNTs in the photocatalytic degradation of methylamine were investigated using XRD,TEM,BET,XPS,UV-Vis DRS,PL and ESR tests.When the Pt elements were loaded in the form of PtO_(x)and Pt^(0),the adsorption process of methylamine on the surface of the catalysts was affected,although the light absorption and carrier separation properties of the samples were enhanced.This scenario was unfavorable for the photocatalytic oxidation process of methylamine.Only when the platinum element was loaded on the TNTs in the form of PtCl_(x)to construct a new Pt(III)-Pt(IV)electron transfer channel,the photocatalytic degradation performance of methylamine was significantly promoted.

关 键 词：甲胺 光催化降解 二氧化钛纳米管 铂改性 化学价态 

分 类 号：X505[环境科学与工程—环境工程] X701