摘要
采用光沉积法掺杂Pt分别制备光催化剂Pt/TNTs和Pt/TiO2,采用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)和紫外可见分光光度计(UV-Vis)对光催化剂进行表征,考察甲醇溶液浓度和Pt掺杂量对光催化产氢效率的影响,并在紫外光(320~400 nm)和可见光(400~700 nm)下比较TiO2、TNTs、Pt/TiO2和Pt/TNTs 4种催化剂催化甲醇溶液的产氢效率。结果显示:掺杂Pt可将光催化剂吸收波长红移至可见光区域,由于TNTs具有更大的比表面积,可负载更多的Pt,使电子有效转移至金属上,降低电子电洞对再结合的概率,并增加光催化效果;Pt/TNTs在紫外光和可见光的照射下,光催化效率均高于Pt/TiO2,在最佳Pt负载量为1%(以质量分数计),甲醇溶液质量分数为20%的条件下,Pt/TNTs在紫外光和可见光下产氢率分别为2331,137.7μmol/h。对比可知,本研究的可见光催化产氢系统具有很大的发展潜力。
The photocatalysts Pt/TNTs and Pt/TiO2 were prepared by doping Pt by photodeposition method.Characterization of the catalysts was conducted by SEM,TEM,XRD and UV-Vis spectrophotometer.The effect of methanol concentration and Pt doping content on hydrogen production was investigated.And the hydrogen production efficiency of TiO2,TNTs,Pt/TiO2 and Pt/TNTs under UV-light(320~400 nm)and visible light(400~700 nm)was compared.The results showed that Pt doping shifted the photocatalysts absorbance into the visible light region.Because of the higher specific surface area of TNTs than TiO2,more Pt could be loaded,which effectively transfered electronholes to the genus,reduced the probability of recombination of electrons and electrons holes,and increased the photocatalytic effect.Pt/TNTs showed higher hydrogen production efficiency under both UV-light and visible light.Under Pt doping proportion of 1%(by mass),the hydrogen production rate of Pt/TNTs could achieve 2331μmol/h under UV light and 137.7μmol/h under visible light with 20%methanol solution(by volume).Compared with other literatures,the visible-light photocatalytic hydrogen production system in this study had resonable development potential.
作者
刘楠楠
骆尚廉
孙宏雨
邱春生
王栋
迟杰
孙力平
聂英进
LIU Nan-nan;LUO Shang-lian;SUN Hong-yu;QIU Chun-sheng;WANG Dong;CHI Jie;SUN Li-ping;NIE Ying-jin(Environmental Science and Engineering,Tianjin University,Tianjin 300350,China;School of Environmental and Municipal Engineering,Tianjin Chengjian University,Tianjin 300384,China;Graduate Institute of Environmental Engineering,Taiwan University,Taibei 10673,China;Tianjin Capital Environmental Protection Group Company Limited,Tianjin 300381,China)
出处
《环境工程》
CAS
CSCD
北大核心
2020年第2期63-69,共7页
Environmental Engineering
基金
天津市应用基础与前言技术研究计划重点项目“微波提升掺杂元素催化剂效能及其可见光Z型反应产氢”(14JCZDJC41100)
水体污染控制与治理科技重大专项(2015ZX07306001)。
关键词
光催化
钛纳米管
PT掺杂
氢
甲醇
photocatalysis
TNTs
Pt doping
hydrogen
methanol
