AgI/h-MoO3异质结的构筑及其模拟燃油光催化氧化脱硫活性 |
AgI/h-MoO3 Heterojunctions:Fabrication and Photocatalytic Oxidative Desulfurization Activity of Simulation Fuel |
作者 | 单位 | E-mail | 甄延忠 | 陕西省化学反应工程重点实验室, 延安大学石油工程与环境工程学院, 延安 716000 | zyz943@163.com | 王杰 | 陕西省化学反应工程重点实验室, 延安大学石油工程与环境工程学院, 延安 716000 | | 付梦溪 | 陕西省化学反应工程重点实验室, 延安大学石油工程与环境工程学院, 延安 716000 西安工业大学材料与化工学院, 西安 710072 | | 张应铮 | 陕西省化学反应工程重点实验室, 延安大学石油工程与环境工程学院, 延安 716000 | | 付峰 | 陕西省化学反应工程重点实验室, 延安大学石油工程与环境工程学院, 延安 716000 | |
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摘要: 利用沉积法获得了异质结AgI/h-MoO3光催化剂,通过X射线衍射(XRD)、扫描电子显微镜(SEM)、光电子能谱(EDS)、X射线光电子能谱(XPS)、紫外-可见漫反射吸收光谱(UV-Vis-DRS)、光致发光(PL)、电化学阻抗(EIS)等方法对其物相组成、形貌、光吸收特性、光电化学性能等进行了表征。以噻吩的正辛烷溶液模拟催化裂化(FCC)汽油为探针考察了AgI/h-MoO3光催化氧化脱硫活性,结果表明,AgI/h-MoO3-18异质结在催化剂浓度为1.5 g·L-1,可见光照射2 h后,光催化氧化脱硫活性达98%。利用XRD、XPS、UV-Vis-DRS揭示了AgI/h-MoO3光照后生成少量的金属Ag,使其结构转变为Z型AgI/Ag/h-MoO3,有利于光生电子(e-)转移。利用活性物种捕获实验、循环实验研究了AgI/h-MoO3光催化氧化脱硫机理及其稳定性,实验结果表明:AgI/h-MoO3不仅具有较高的光催化氧化脱硫活性,而且还有良好的稳定性。 |
关键词: 沉积法 AgI/h-MoO3异质结 可见光 光催化氧化脱硫 |
基金项目: 国家自然科学基金项目(No.21663030)、陕西科技攻关项目(No.2015GY174)、延安市成果转化项目(No.2016CGZH-12-01)、延安大学科技项目(No.YD2015-13)和创新训练项目(No.YCX201734,1553)资助 |
Abstract: AgI/h-MoO3 heterojunction photocatalysts were successfully fabricated by a facile deposition method. XRD, SEM, UV-Vis-DRS, EDS, XPS, PL and EIS were employed to characterize the structure, morphology, optical absorption and photo-electrochemical properties of as-synthesized samples. The photocatalytic oxidative desulfurization activity of as-synthesized samples was investigated with thiophene simulated the catalytic cracking (FCC) gasoline as the probe. The results indicate that AgI/h-MoO3-18 heterojunction has the highest photocatalytic activity and its removal efficiency for thiophene can be up to 98% with catalyst dosage (1.5 g·L-1) under irradiation of visible light for 2 h. XRD, XPS and UV-Vis-DRS measurements reveal that a small amount of metallic Ag which facilitates photoinduced electrons transfer is formed on the surface of used AgI/h-MoO3, thus leading to the transformation from AgI/h-MoO3 to AgI/Ag/h-MoO3. The photocatalytic oxidative desulfurization mechanism and stability performance of AgI/Ag/h-MoO3 were also studied by the active species trapping experiment and recycling run experiment. The experimental results have exhibited that the as-prepared AgI/h-MoO3 heterojunctions not only have higher photocatalytic oxidative desulfurization activity for thiophene, but also have good stability. |
Keywords: deposition method AgI/h-MoO3 heterojunction visible light photocatalytic oxidative desulfurization |
投稿时间:2017-07-17 修订日期:2017-09-10 |
摘要点击次数: 1974 |
全文下载次数: 2238 |
甄延忠,王杰,付梦溪,张应铮,付峰.AgI/h-MoO3异质结的构筑及其模拟燃油光催化氧化脱硫活性[J].无机化学学报,2017,33(10):1731-1740. |
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