物理化学学报 >> 2017, Vol. 33 >> Issue (9): 1891-1897.doi: 10.3866/PKU.WHXB201705111

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基于单质法合成直接Z型CuS-WO3及光催化性能

宋春冬,张静*(),高莹,卢圆圆,王芳芳   

  • 收稿日期:2017-03-28 发布日期:2017-07-05
  • 通讯作者: 张静 E-mail:jingzhang_dicp@live.cn
  • 基金资助:
    国家自然科学基金(21573101);辽宁省自然科学基金项目(2014020107);辽宁省高等学校优秀人才支持计划项目(LJQ2014041);教育部留学回国科研启动基金项目(教外司留[2013]1792号);辽宁省特聘教授项目([2015]153);辽宁省百千万人才工程科技项目([2017]96);中国科学院大连化学物理研究所催化基础重点实验室开放课题项目(N-15-10)

Synthesis Direct Z-Scheme CuS-WO3 Photocatalysts Based on an Element-Reaction Route and Their Photocatalytic Activity

Chun-Dong SONG,Jing ZHANG*(),Ying GAO,Yuan-Yuan LU,Fang-Fang WANG   

  • Received:2017-03-28 Published:2017-07-05
  • Contact: Jing ZHANG E-mail:jingzhang_dicp@live.cn
  • Supported by:
    the National Natural Science Foundation of China (21573101, 20903054)(21573101);the Liaoning Provincial Natural Science Foundation(2014020107);the Program for Liaoning Excellent Talents in University(LJQ2014041);the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry(教外司留[2013]1792号);the support plan for Distinguished Professor of Liaoning Province([2015]153);the Liaoning BaiQianWan Talents program([2017]96);the fund of the State Key Laboratory of Catalysis in DICP(N-15-10)

摘要:

以Cu粉和S粉作为CuS前驱体,基于单质法在低温下原位合成了CuS-WO3光催化剂。采用X射线衍射(XRD)、扫描电镜(SEM)、X射线光电子能谱(XPS)、比表面积和紫外-可见漫反射光谱(UV-Vis DRS)对CuS-WO3的晶相、形貌、粒径及光学性质等进行了表征。结果表明,CuS对WO3的晶相结构、粒径及比表面积没有明显影响,但是可以有效提高WO3对可见光的吸收。以降解罗丹明B(RhB)为反应模型,研究了CuS对WO3光催化性能的影响。结果表明,在可见光照射下,CuS-WO3复合材料的光催化活性优于CuS、WO3的光催化活性,且CuS的含量对CuS-WO3光催化活性影响显著,CuS含量为7%(w,质量分数)时,光催化效率最高(91.3%)。进一步结合CuS、WO3的能带位置,荧光光谱(PL)活性物种鉴定试验,提出CuS-WO3复合光催化剂的“直接Z型”光催化机理。直接Z型CuS-WO3复合光催化剂中可以有效抑制电子-空穴的复合。因此,与CuS和WO3相比,CuS-WO3复合光催化剂具有较高的光催化性能。

关键词: 硫化铜, 氧化钨, 直接Z型, 罗丹明B, 光催化

Abstract:

CuS fabricated by an element-reaction route using copper and sulfur powders was loaded on WO3 in situ at a low temperature. X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller analysis, and UV-visible diffuse reflectance spectra were used to characterize the crystalline phase, morphology, particle size, and optical properties of the CuS-WO3 samples. CuS modification had no obvious influence on the crystalline phase, particle size, and surface area of WO3. However, it led to the enhancement of the utilization of light energy for WO3. CuS-WO3 composites were utilized as photocatalysts for the degradation of Rhodamine B. The CuS-WO3 photocatalysts showed higher photocatalytic activity than pure WO3 or CuS under visible light irradiation. CuS content had a significant influence on the photocatalytic activity of CuS-WO3. CuS-WO3 with 7% (w, mass fraction) CuS content exhibited the highest photocatalytic degradation activity (91.3%). Based on analysis of the band structure of CuS and WO3, photoluminescence results, and active species trapping, a "direct Z-scheme" mechanism for the enhanced photocatalytic activity of CuS-WO3 was proposed. The "direct Z-scheme" results in effective charge separation, leading to increased photocatalytic activity compared to that of CuS and WO3.

Key words: CuS, WO3, Direct Z-scheme, Rhodamine B, Photocatalytic

MSC2000: 

  • O643