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Flower-like Ag2WO4/CeO2 heterojunctions with oxygen vacancies and expedited charge carrier separation boost the photocatalytic degradation of dyes and drugs
Dalton Transactions ( IF 3.5 ) Pub Date : 2022-06-08 , DOI: 10.1039/d2dt01420c Fangxiao Wang 1 , Rong Liu 1 , Qinfeng Xu 2 , Chun-Yang Zhang 1
Dalton Transactions ( IF 3.5 ) Pub Date : 2022-06-08 , DOI: 10.1039/d2dt01420c Fangxiao Wang 1 , Rong Liu 1 , Qinfeng Xu 2 , Chun-Yang Zhang 1
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Charge carrier separation is a very important factor in photocatalysis, and it may be achieved through a variety of paths including the construction of heterojunctions and the formation of surface defects. Herein, we demonstrate the construction of flower-like Ag2WO4/CeO2 heterojunctions (namely ACs) by in situ deposition of Ag2WO4 on the surface of flower-like CeO2 with oxygen defects. The ACs with 2.3%, 3.8%, and 5.3% Ag2WO4 are defined as AC-1, AC-2, and AC-3, respectively, and we compare their photocatalytic removal efficiencies. Under visible light, AC-2 exhibits the highest photocatalytic removal efficiency toward cationic dye RhB and tetracycline (TC). The K value of AC-2 toward RhB degradation is determined to be 0.059 min−1, which is 7.56 and 8.94-fold higher than those of Ag2WO4 (0.0078 min−1) and CeO2 (0.0066 min−1), respectively. Moreover, the K value of AC-2 toward TC degradation (0.021 min−1) is 4.04 and 5.68-fold higher than those of Ag2WO4 (0.0052 min−1) and CeO2 (0.0037 min−1), respectively. Our results clearly demonstrate that the introduction of Ag2WO4 particles stimulates the formation of surface defects of CeO2, improves the visible light absorption, accelerates the charge carrier separation, and consequently boosts the photocatalytic degradation of dyes and drugs.
中文翻译：
花状 Ag2WO4/CeO2 异质结与氧空位和加速电荷载流子分离促进染料和药物的光催化降解
载流子分离是光催化中非常重要的因素，它可以通过多种途径实现，包括异质结的构建和表面缺陷的形成。在此，我们展示了通过在具有氧缺陷的花状CeO 2表面上原位沉积Ag 2 WO 4来构建花状Ag 2 WO 4 /CeO 2异质结（即ACs） 。具有 2.3%、3.8% 和 5.3% Ag 2 WO 4的 AC分别定义为 AC-1、AC-2 和 AC-3，我们比较了它们的光催化去除效率。在可见光下，AC-2对阳离子染料RhB和四环素（TC）的光催化去除效率最高。AC-2对RhB降解的K值确定为0.059 min -1 ，分别是Ag 2 WO 4 (0.0078 min -1 )和CeO 2 (0.0066 min -1 )的7.56和8.94倍，分别。此外，AC-2对TC降解的K值（0.021 min -1 ）分别是Ag 2 WO 4（0.0052 min ）的4.04和5.68倍-1 ) 和CeO 2 (0.0037 min -1 )。我们的结果清楚地表明，Ag 2 WO 4颗粒的引入促进了CeO 2表面缺陷的形成，改善了可见光吸收，加速了电荷载流子的分离，从而促进了染料和药物的光催化降解。
更新日期：2022-06-08
中文翻译：
花状 Ag2WO4/CeO2 异质结与氧空位和加速电荷载流子分离促进染料和药物的光催化降解
载流子分离是光催化中非常重要的因素，它可以通过多种途径实现，包括异质结的构建和表面缺陷的形成。在此，我们展示了通过在具有氧缺陷的花状CeO 2表面上原位沉积Ag 2 WO 4来构建花状Ag 2 WO 4 /CeO 2异质结（即ACs） 。具有 2.3%、3.8% 和 5.3% Ag 2 WO 4的 AC分别定义为 AC-1、AC-2 和 AC-3，我们比较了它们的光催化去除效率。在可见光下，AC-2对阳离子染料RhB和四环素（TC）的光催化去除效率最高。AC-2对RhB降解的K值确定为0.059 min -1 ，分别是Ag 2 WO 4 (0.0078 min -1 )和CeO 2 (0.0066 min -1 )的7.56和8.94倍，分别。此外，AC-2对TC降解的K值（0.021 min -1 ）分别是Ag 2 WO 4（0.0052 min ）的4.04和5.68倍-1 ) 和CeO 2 (0.0037 min -1 )。我们的结果清楚地表明，Ag 2 WO 4颗粒的引入促进了CeO 2表面缺陷的形成，改善了可见光吸收，加速了电荷载流子的分离，从而促进了染料和药物的光催化降解。
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