Cadmium sulfide quantum dots/dodecahedral polyoxometalates/oxygen-doped mesoporous graphite carbon nitride with Z-scheme and Type-II as tandem heterojunctions for boosting visible-light-driven photocatalytic performance

被引：51
作者：
Qiu, Yalu [1 ]
Xing, Zipeng [1 ]
Guo, Meijun [1 ]
Zhao, Tianyu [1 ]
Wang, Yu [1 ]
Chen, Peng [1 ]
Li, Zhenzi [2 ]
Pan, Kai [1 ]
Zhou, Wei [1 ]
机构：
[1] Heilongjiang Univ, Sch Chem & Mat Sci, Minist Educ Peoples Republ China, Dept Environm Sci,Key Lab Funct Inorgan Mat Chem, Harbin 150080, Peoples R China
[2] Qilu Univ Technol, Sch Chem & Chem Engn, Shandong Prov Key Lab Mol Engn, Shandong Acad Sci, Jinan 250353, Shandong, Peoples R China
来源：
JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2021年 / 582卷
基金：
中国国家自然科学基金;
关键词：
Photocatalysis; Tandem heterojunction; Z-scheme structure; Type-II heterojunction; Mesoporous material; METAL-ORGANIC FRAMEWORK; AQUEOUS-SOLUTION; CDS NANOPARTICLES; METHYLENE-BLUE; EXPERIMENTAL-DESIGN; PASTE ELECTRODE; WATER; ZEOLITE; PHOTODEGRADATION; G-C3N4;
D O I：
10.1016/j.jcis.2020.08.079
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
It is known that fabrication of tandem heterojunctions between different types of heterojunctions can promote the charge separation. Herein, novel cadmium sulfide quantum dots (CdS QDs)/dodecahedral phosphotungstic acid potassium K3PW12O40 (KPW)/oxygen-doped mesoporous graphite carbon nitride (meso-g-C3N4) nanosheets tandem heterojunctions are prepared by the hydrothermal method combined with direct template calcination and in-situ chemical sedimentation strategy. The results show that tan-dem heterojunctions formed by the Z-Scheme heterojunction between CdS QDs and KPW and the type-II heterojunction between CdS QDs and meso-g-C3N4 can extend the optical response into visible light region. Importantly, under visible light irradiation, photocatalytic hydrogen production rate and photo catalytic Cr6+ removal rate over CdS/KPW/meso-g-C3N4 is higher than that of KPW and CdS/KPW. This remarkable photocatalytic performance is due to the effective charge separation and transfer of the special tandem heterojunction structure. This novel tandem heterojunction will offer new insights for fabricating other high-performance photocatalytic systems (c) 2020 Elsevier Inc. All rights reserved.
引用
收藏
页码：752 / 763
页数：12
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