直接Z-型立方/六方ZnIn<sub>2</sub>S<sub>4</sub>复合光催化剂的制备及其光催化性能

doi:10.11901/1005.3093.2018.387

材料研究学报

2019, Vol. 33

Issue (2): 145-154 DOI: 10.11901/1005.3093.2018.387

本期目录 | 过刊浏览

直接Z-型立方/六方ZnIn₂S₄复合光催化剂的制备及其光催化性能

陈顺生^1,²,李少珍¹,罗晓婧³,王国宏⁴(

)

1. 湖北理工学院数理学院黄石 435003
2. 湖北大学物理与电子科学学院铁电压电材料与器件湖北省重点实验室武汉 430062
3. 上海电力学院数理学院上海 201300
4. 湖北师范大学湖北省稀有金属化学协同创新中心黄石 435002

Preparation and Photocatalytic Properties of Direct Z-Scheme Hexagonal/Cubic ZnIn₂S₄ Composite Catalysts

Shunsheng CHEN^1,²,Shaozhen LI¹,Xiaojing LUO³,Guohong WANG⁴(

)

1. School of Mathematics and Physics, Hubei Polytechnic University, Huangshi 435003, China
2. Hubei Key Laboratory of Ferro & Piezoelectric Materials and Devices, Faculty of Physics & Electronic Science, Hubei University, Wuhan 430062, China
3. College of Mathematics and Physics, Shanghai University of Electric Power, Shanghai 201300, China
4. Hubei Collaborative Innovation Center for Rare Metal Chemistry, Hubei Normal University, Huangshi 435002, China

引用本文:

陈顺生,李少珍,罗晓婧,王国宏. 直接Z-型立方/六方ZnIn₂S₄复合光催化剂的制备及其光催化性能[J]. 材料研究学报, 2019, 33(2): 145-154.
Shunsheng CHEN, Shaozhen LI, Xiaojing LUO, Guohong WANG. Preparation and Photocatalytic Properties of Direct Z-Scheme Hexagonal/Cubic ZnIn₂S₄ Composite Catalysts[J]. Chinese Journal of Materials Research, 2019, 33(2): 145-154.

全文: PDF(11874 KB) HTML

摘要:

通过水热反应方法制备出立方相ZnIn₂S₄和六方相ZnIn₂S₄和系列不同摩尔比的复合相ZnIn₂S₄光催化剂，使用X射线衍射、扫描电子显微镜、电子能谱、透射电子显微镜、光致发光光谱、N₂吸附-脱附法及紫外-可见光漫反射等手段表征了样品的晶体结构、显微结构及吸光特性并在可见光照射下进行了甲基橙降解实验。结果表明，复合相ZnIn₂S₄样品都具有比立方相、六方相和机械混合的ZnIn₂S₄更好的可见光催化活性，当复合相ZnIn₂S₄样品中立方相与六方相摩尔比为3:7时体系的催化活性最高。这种样品被可见光照射30 min后，甲基橙的降解率达到95.2%。其降解机理与样品较大的比表面积以及样品中的立方相与六方相之间的密切接触而形成直接Z-型光催化过程有关。

关键词 ：无机非金属材料, 可见光催化降解, 水热法, 直接Z-型复合光催化剂, 复合相ZnIn₂S₄

Abstract：

Photocatalysts of cubic ZnIn₂S₄ and hexagonal ZnIn₂S₄ as well as a series of Cubic ZnIn₂S₄/hexagonal ZnIn₂S₄ composite with different molar ratios were synthesized via hydrothermal method. The crystal structure, microstructure and optical absorption property of the as-synthesized photocatalysts were characterized by means of X-ray diffractometer, scanning electron microscopy, transmission electron microscopy, photoluminescence spectrometer, Brunauer-Emmett-TeIler analysis and UV-visible diffuse reflectance spectroscopy. The photocatalytic activities of the prepared photocatalysts were evaluated through photocatalytic degradation of methyl orange under visible-light irradiation. Results show that all the composite photocatalysts have much better photocatalytic activity than that of the catalysts of cubic ZnIn₂S₄ and hexagonal ZnIn₂S₄ as well as the mechanically mixed ZnIn₂S₄ of the above two pure catalysts; Among others, the composite with more ratio 3:7 for cubic ZnIn₂S₄ to hexagonal ZnIn₂S₄ presents the highest photocatalytic activity with degradation efficiency for methyl orange up to 95.2% under visible-light irradiation for 30 minutes. This property can be attributed to the much larger specific surface areas and a direct Z-scheme photocatalytic process due to the close contact of cubic ZnIn₂S₄ and hexagonal ZnIn₂S₄ produced by the hydrothermal synthesis process.

Key words： inorganic non-metallic materials visible-light photocatalytic degradation hydrothermal method direct Z-scheme composite photocatalyst ZnIn₂S₄ composite catalysts

收稿日期: 2018-06-12

ZTFLH:

O643.36

基金资助:国家自然科学基金(11504227);国家自然科学基金(51302074);国家自然科学基金(11374147)

作者简介: 陈顺生，男，1975年生，博士

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表1 样品C，7C-3H，5C-5H，3C-7H和H的原料配比

图1 合成的ZnIn2S4样品的XRD图谱

图2 六方相ZnIn2S4和立方相ZnIn2S4的EDS图谱

图3 ZnIn2S4样品的漫反射图谱和根据αhυ–hυ关系拟合的带隙曲线

图4 样品C，7C-3H，5C-5H，3C-7H，H及3C-7H-H降解MO的吸收光谱

图5 样品的可见光光催化降解活性曲线

图6 样品C，H及3C-7H的SEM图片

图7 样品3C-7H的TEM照片及HRTEM images照片

图8 样品C，5C-5H和3C-7H的N2吸脱附等温曲线, 内插图是样品的孔径分布曲线

表2 样品C，5C-5H和3C-7H的BET测量数据.

图9 样品C，样品H及样品3C-7H的PL谱，激发波长400 nm

图10 样品3C-7H的循环测试曲线

图11 样品3C-7H的活性物种捕捉实验结果

图12 样品3C-7H光催化机理示意图

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