Achieving improved full-spectrum responsive 0D/3D CuWO4/BiOBr:Yb3+, Er3+ photocatalyst with synergetic effects of up-conversion, photothermal effect and direct Z-scheme heterojunction

被引：62

作者：

Yao, Xintong ^{[1
]}

Jiang, Xue ^{[1
]}

Zhang, Dafeng ^{[1
]}

Lu, Shuya ^{[1
]}

Wang, Mengyao ^{[1
]}

Pan, Sihan ^{[1
]}

Pu, Xipeng ^{[1
]}

Liu, Junchang ^{[1
]}

Cai, Peiqing ^{[2
]}

机构：

[1] Liaocheng Univ, Sch Mat Sci & Engn, Shandong Prov Key Lab Chem Energy Storage & Novel, Liaocheng 252000, Peoples R China

[2] China Jiliang Univ, Coll Opt & Elect Technol, Hangzhou 310018, Peoples R China

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2023年 / 644卷

关键词：

Full-spectrum; Direct Z-scheme; Up-conversion; Photothermal effect; Photocatalyst; CuWO4/BiOBr.Yb3+; Er3+; DEGRADATION; EVOLUTION; PH;

D O I：

10.1016/j.jcis.2023.04.072

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：

The key to obtain effective photocatalysts is to increase the efficiency of light energy conversion , thus the design , implementation of full-spectrum photocatalysts is a potential approach to solve this problem especially by extending the absorption range to near-infrared (NIR) light. Herein, the improved full-spectrum responsive CuWO4/BiOBr:Yb3+,Er3+ (CW/BYE) direct Z-scheme heterojunction was prepared. The CW/BYE with CW mass ratio of 5% had the best degradation performance, and the removal rate of tetracycline reached 93.9% in 60 min and 69.4% in 12 h under visible (Vis) and NIR light, respectively, which were 5.2 and 3.3 times of BYE. According to the outcome of experimental, the reasonable mechanism of improved photoactivity was put forward on the basis of (i) the up-conversion (UC) effect of Er3+ ion to convert NIR photon to ultraviolet or visible light, which can be used by CW and BYE, (ii) the photothermal effect of CW to absorb the NIR light, increasing the local temperature of photocatalyst particle to accelerate the photoreaction , (iii) the formed direct Z -scheme heterojunction between BYE , CW to boost the separation of photogenerated electron-hole pairs. Additionally, the excellent photostability of the photocatalyst was verified by cycle degradation experiments. This work opens up a promising technique for designing and synthesizing full-spectrum photocatalysts by uti-lizing synergetic effects of UC, photothermal effect and direct Z-scheme heterojunction.

引用

页码：95 / 106

页数：12

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