학술논문
Construction of Bi[sub.2]WO[sub.6]/g-C[sub.3]N[sub.4] Z-Scheme Heterojunction and Its Enhanced Photocatalytic Degradation of Tetracycline with Persulfate under Solar Light
Document Type
Academic Journal
Author
Source
Molecules (Basel). March 2024, Vol. 29 Issue 5
Subject
Language
English
ISSN
1420-3049
Abstract
Author(s): Yukun Li (corresponding author) [1,*]; Haiyang Zhang [1]; Dan Zhang [2]; Sen Yao [1]; Shuying Dong [3]; Qishi Chen [1]; Fengjuan Fan [1]; Hongyuan Jia [1]; Mingjia Dong [1] [...]
Z-scheme heterojunction Bi[sub.2]WO[sub.6]/g-C[sub.3]N[sub.4] was obtained by a novel hydrothermal process; its photocatalysis–persulfate (PDS) activation for tetracycline (TC) removal was explored under solar light (SL). The structure and photoelectrochemistry behavior of fabricated samples were well characterized by FT-IR, XRD, XPS, SEM-EDS, UV-vis DRS, Mott-Schottky, PL, photocurrent response, EIS and BET. The critical experimental factors in TC decomposition were investigated, including the Bi[sub.2]WO[sub.6] doping ratio, catalyst dosage, TC concentration, PDS dose, pH, co-existing ion and humic acid (HA). The optimum test conditions were as follows: 0.4 g/L Bi[sub.2]WO[sub.6]/g-C[sub.3]N[sub.4] (BC-3), 20 mg/L TC, 20 mg/L PDS and pH = 6.49, and the maximum removal efficiency of TC was 98.0% in 60 min. The decomposition rate in BC-3/SL/PDS system (0.0446 min[sup.−1]) was 3.05 times higher than that of the g-C[sub.3]N[sub.4]/SL/PDS system (0.0146 min[sup.−1]), which might be caused by the high-efficiency electron transfer inside the Z-scheme Bi[sub.2]WO[sub.6]/g-C[sub.3]N[sub.4] heterojunction. Furthermore, the photogenerated hole (h[sup.+]), superoxide (O[sub.2]•[sup.−]), sulfate radical (SO[sub.4]•[sup.−]) and singlet oxygen ([sup.1]O[sub.2]) were confirmed as the key oxidation factors in the BC-3/SL/PDS system for TC degradation by a free radical quenching experiment. Particularly, BC-3 possessed a wide application potential in actual antibiotic wastewater treatment for its superior catalytic performance that emerged in the experiment of co-existing components.
Z-scheme heterojunction Bi[sub.2]WO[sub.6]/g-C[sub.3]N[sub.4] was obtained by a novel hydrothermal process; its photocatalysis–persulfate (PDS) activation for tetracycline (TC) removal was explored under solar light (SL). The structure and photoelectrochemistry behavior of fabricated samples were well characterized by FT-IR, XRD, XPS, SEM-EDS, UV-vis DRS, Mott-Schottky, PL, photocurrent response, EIS and BET. The critical experimental factors in TC decomposition were investigated, including the Bi[sub.2]WO[sub.6] doping ratio, catalyst dosage, TC concentration, PDS dose, pH, co-existing ion and humic acid (HA). The optimum test conditions were as follows: 0.4 g/L Bi[sub.2]WO[sub.6]/g-C[sub.3]N[sub.4] (BC-3), 20 mg/L TC, 20 mg/L PDS and pH = 6.49, and the maximum removal efficiency of TC was 98.0% in 60 min. The decomposition rate in BC-3/SL/PDS system (0.0446 min[sup.−1]) was 3.05 times higher than that of the g-C[sub.3]N[sub.4]/SL/PDS system (0.0146 min[sup.−1]), which might be caused by the high-efficiency electron transfer inside the Z-scheme Bi[sub.2]WO[sub.6]/g-C[sub.3]N[sub.4] heterojunction. Furthermore, the photogenerated hole (h[sup.+]), superoxide (O[sub.2]•[sup.−]), sulfate radical (SO[sub.4]•[sup.−]) and singlet oxygen ([sup.1]O[sub.2]) were confirmed as the key oxidation factors in the BC-3/SL/PDS system for TC degradation by a free radical quenching experiment. Particularly, BC-3 possessed a wide application potential in actual antibiotic wastewater treatment for its superior catalytic performance that emerged in the experiment of co-existing components.