自组装的3D MoS_2花球负载TiO_2纳米管阵列的制备、表征及光电催化降解有机污染物的研究
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- 英文论文题名：Self-Assembly 3D Flower-like MoS_2-Sensitized TiO_2 Nanotube Arrays Electrode Preparation,Characterization and Photoelectrocatalytic Degradation of Organic Pollutants
- 论文作者：曾立彬 ; 李新勇
- 英文论文作者：Libin Zeng ; Xinyong Li ; Dalian University of Technology
- 年：2016
- 作者机构：大连理工大学环境学院;
- 论文关键词：光电催化 ; Mo S2 ; 3D花球 ; 活性基团
- 英文论文关键词：Photoelectrocatalysis ; MoS_2 ; 3D flower-like ; Active groups
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十六分会：环境化学
- 语种：中文
- 分类号：X505;O614.411
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十六分会 ; 环境化学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：221k
- 原文格式：D
- 会议级别：全国
摘要
新型高催化性能的可见光响应光电极材料的制备及性能研究是当今环境领域的研究热点之一,本文采用水热辅助阳极氧化的方法在无表面活性剂和模板的条件下成功地制备出自组装3 D花状的Mo S2球修饰TiO_2纳米管阵列,同时结合电子显微镜、X-射线衍射和电子顺磁以及电化学表征手段对复合电极的形貌、晶型、光电化学性能以及催化性能进行了深入研究。结果表明:花球状Mo S2不仅拓宽原TiO_2纳米管阵列的光响应光谱范围,同时也提高了光致电荷表面-界面的分离效率。可见光照射条件下,该电极在3 h内对有机染料亚甲基蓝的光电协同催化降解可达到100%的去除,且循环测试试验中表现出优异的稳定性。光电化学特性研究显示:Mo S2/TiO_2复合电极的可见光的光电转换效率比单一的TiO_2提高了6.5倍。在此研究基础上,利用电子顺磁结合荧光探针等多谱学手段研究了该催化反应的机理,发现ROS基团(·OH和·O2-)是催化反应中活性自由基,同时借助能带结构理论深层次地解释了该复合电极催化降解污染物的机制。
In recent decades,exploiting novel visible light-induced anode is one of central issues in the environmental field.A mild hydrothermal assisted anodization approach has been elaborated to synthesize 3D flower-like Mo S2/TiO_2 nanotube arrays(NTAs) electrode.The morphology,crystalline and photoelectric properties were measured by scanning electron microscopy(SEM),X-ray diffraction(XRD),electron paramagnetic resonance(EPR),and so on.The study showed that as-prepared electrodes not only broadened the spectrum response range but also promoted faster charge separation.Its photoelectrocatalytic activity was investigated by the degradation of methylene blue(MB) under visible light irradiation,showing 100% removal efficiency and high stability.The photocurrent conversion efficiency of Mo S2/TiO_2 was 6.5 times higher than that of pure TiO_2.Moreover,the photo-generated active species(·OH and ·O2-) have been detected by EPR,fluorescence probe and other techniques,Further a comprehensive mechanism was elaborated to explain its catalytic performance by the energy band structures.
In recent decades,exploiting novel visible light-induced anode is one of central issues in the environmental field.A mild hydrothermal assisted anodization approach has been elaborated to synthesize 3D flower-like Mo S2/TiO_2 nanotube arrays(NTAs) electrode.The morphology,crystalline and photoelectric properties were measured by scanning electron microscopy(SEM),X-ray diffraction(XRD),electron paramagnetic resonance(EPR),and so on.The study showed that as-prepared electrodes not only broadened the spectrum response range but also promoted faster charge separation.Its photoelectrocatalytic activity was investigated by the degradation of methylene blue(MB) under visible light irradiation,showing 100% removal efficiency and high stability.The photocurrent conversion efficiency of Mo S2/TiO_2 was 6.5 times higher than that of pure TiO_2.Moreover,the photo-generated active species(·OH and ·O2-) have been detected by EPR,fluorescence probe and other techniques,Further a comprehensive mechanism was elaborated to explain its catalytic performance by the energy band structures.
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