pn型Cu2O-WO3的制备及光催化性能

doi:10.16085/j.issn.1000-6613.2019-0421

摘要/Abstract

摘要：

采用高温水热法和共沉淀法制备了不同摩尔比的pn型Cu₂O-WO₃复合半导体材料。并利用扫描电子显微镜（SEM）、透射电子显微镜（TEM）和X射线衍射（XRD）对样品的形貌特征和晶格结构进行表征。表征结果显示，复合材料由立方相的Cu₂O和六方相的WO₃组成。与纯WO₃物质相比，Cu₂O-WO₃复合半导体材料的紫外吸收边界发生显著红移，在可见光波长范围内的光吸收明显增强，展示出优良的光电流响应性能。以罗丹明B（RhB）溶液的光降解表征材料的光催化性能的过程中，在可见光下光照8h后，相较于WO₃和Cu₂O仅为22.2%和45.2%的光降解率，摩尔比为1∶2的Cu₂O-WO₃复合物的降解效率达到了90.6%。

关键词: 氧化亚铜, 三氧化钨, 复合材料, 催化剂, 光催化反应

Abstract:

pn-Type Cu₂O-WO₃ composite semiconductor materials with different mole ratios were successfully prepared by high temperature hydrothermal method and coprecipitation method. The morphology and structure of the samples were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The result shows that the composite is composed of cubic phase Cu₂O and hexagonal phase WO₃. In comparison with pure WO₃, the ultraviolet absorption boundary of Cu₂O-WO₃ composite semiconductor material has a significant red shift which enhanced the optical absorption under visible light, showing the good photocurrent response. The photocatalytic activities of the materials were characterized by degradation of rhodamine B (RhB) solution under visible light, and the photodegradation rate of Cu₂O-WO₃ composite with 1∶2 mole ratio reached 90.6%, while those of 22.2% and 45.2% for WO₃ and Cu₂O respectively after 8h light irradiation were obtained.

Key words: cuprous oxide, tungsten trioxide, composites, catalyst, photocatalytic reaction

中图分类号:

O643

王宏智,李骏,姚素薇,张卫国. pn型Cu₂O-WO₃的制备及光催化性能[J]. 化工进展, 2019, 38(12): 5442-5448.

Hongzhi WANG,Jun LI,Suwei YAO,Weiguo ZHANG. Synthesis and photocatalytic properties of pn-type Cu₂O-WO₃[J]. Chemical Industry and Engineering Progress, 2019, 38(12): 5442-5448.

图/表 11

图1 系列Cu2O-WO3复合物的SEM图

图2 Cu2O-WO3-1∶2的TEM和HRTEM图

图3 WO3、Cu2O和Cu2O-WO3的XRD谱图

图4 Cu2O和WO3的Mott-Schottky曲线

图5 WO3和不同摩尔比Cu2O-WO3的光电流-电压曲线a—WO3; b—Cu2O-WO3-1∶4; c—Cu2O-WO3-1∶1; d—Cu2O-WO3-1∶2

图6 WO3和不同摩尔比例Cu2O-WO3复合物的紫外-可见吸收光谱a—WO3; b—Cu2O-WO3-1∶4; c—Cu2O-WO3-1∶1; d—Cu2O-WO3-1∶2

图7 无催化剂、WO3、Cu2O和Cu2O-WO3-1∶2的光降解性能曲线

图8 样品在可见光下降解RhB溶液的动力学曲线

表1 光降解RhB溶液的动力学常数和相关系数

催化材料	反应速率常数k/h^-1	线性相关系数R
Cu₂O	0.07722	0.99129
WO₃	0.03479	0.99651
Cu₂O-WO₃	0.22958	0.99198

表2 比较不同材料的光降解RhB性能

材料	光源	光降解率/%	参考文献
Cu₂O-WO₃	500W Xe灯	90.6	本文
15%g-C₃N₄/LaFeO₃	200W Xe灯	58.4	[29]
g-C₃N₄/Fe₃O₄/NiWO₄	50W LED灯	87	[30]
N-doped KTiNbO₅/g-C₃N₄	500W Xe灯	89.9	[31]
Ag₂CO₃/Ag/WO₃	300W Xe 灯	89.3	[32]
TiO₂ NTs/Cu₂O	500W Xe灯	61.83	[33]

图9 Cu2O-WO3复合材料电荷转移过程示意图

参考文献 35

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pn型Cu₂O-WO₃的制备及光催化性能

Synthesis and photocatalytic properties of pn-type Cu₂O-WO₃

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