光降解
可见光谱
异质结
降级(电信)
四环素
材料科学
光催化
化学
电子顺磁共振
光化学
核化学
光电子学
催化作用
有机化学
核磁共振
计算机科学
物理
电信
抗生素
生物化学
作者
Lijia Huang,Hui Liu,Tian Cheng Zhang,Yuan Wang,Shaojun Yuan
标识
DOI:10.1021/acs.iecr.2c02458
摘要
Antibiotic residues entering the ecological environment not only cause serious environmental pollution but also may cause the development of resistance genes and other ecological risks. Therefore, the degradation of antibiotic contaminants has become a research hot spot. Herein, a new Z-scheme BiVO4/exfoliated g-C3N4 heterojunction photocatalyst was synthesized for efficient tetracycline photodegradation with the assistance of peroxymonosulfate under visible light irradiation. The influence of different key environmental factors, including peroxymonosulfate concentrations, coexisting ions, and solution pH, on the photodegradation efficiency of tetracycline was comprehensively studied. The optimized BiVO4/exfoliated g-C3N4–0.6 was demonstrated to exhibit excellent photodegradation performance of tetracycline with an apparent kinetic constant of ca. 0.128 min–1 with 0.3 mM peroxymonosulfate, which was ca. 3 times of exfoliated g-C3N4 (0.0415 min–1) under the same conditions and about 16 times and 5 times of bulk g-C3N4 (0.0080 min–1) and exfoliated g-C3N4 (0.0285 min–1) without peroxymonosulfate, respectively. The BiVO4/exfoliated g-C3N4–0.6 showed only about 5% reduction in the degradation efficiency of tetracycline after six consecutive cycle experiments. The free radical scavenging test and electron spin resonance characterization results suggested that •O2–, h+, •SO4–, •OH, and 1O2 were all involved in the catalytic oxidative process of tetracycline in the BiVO4/exfoliated g-C3N4–0.6, peroxymonosulfate and light reaction system. This study not only offers an attractive Z-scheme heterojunction photocatalyst for tetracycline degradation but also demonstrates a promising way to use peroxymonosulfate for advanced wastewater treatment.
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