光催化
制作
阳光
水溶液
降级(电信)
化学
纳米复合材料
材料科学
复合材料
化学工程
光学
纳米技术
催化作用
有机化学
物理
医学
抗生素
工程类
病理
电信
生物化学
替代医学
计算机科学
作者
Gandharve Kumar,Ruma Dutta
标识
DOI:10.1016/j.jpcs.2022.110639
摘要
Increase in the concentration of residual antibiotics in water bodies, including drinking water, has led to developing strategies for their remediation. Here we report a very efficient method of photocatalytic degradation of tetracycline (TC) and ciprofloxacin (CIP) antibiotics in aqueous medium using Z-scheme heterojunction based 0.10SnS 2 /Bi 2 WO 6 solar photocatalyst. The photocatalyst synthesized by hydrothermal route is thoroughly characterized in terms of its structural, compositional, morphological, and optical properties. About 97% of tetracycline and 93% of ciprofloxacin is degraded in 90 min of sunlight exposure at a photocatalytic rate of 0.027 min −1 and 0.024 min −1 , respectively. The total organic carbon estimation of the post-degradation reaction medium corresponded to 80.1% (TC) and 71.1% (CIP) mineralization. The photocatalytic degradation of TC and CIP is attributed to the in-situ generation of reactive oxygen species (ROS), e.g., superoxide radicals, hydroxide radicals, confirmed from ROS scavenging studies. ROS generation is favored by construction of Z-scheme heterojunction, and charge carrier mobility in the photocatalyst. The degradation mechanism has been discussed by analyzing the degradation products via ultra-performance liquid chromatography coupled to quadrupole-Time-of-Flight based mass spectrometry (UPLC-Q-Tof-MS). • Synthesis & characterization of Z-scheme heterojunction SnS 2 /Bi 2 WO 6 photocatalyst. • Excellent sunlight mediated photocatalytic degradation of TC and CIP antibiotics. • Enhanced degradation is due to sustained ROS generation in the reaction medium. • Degradation pathway by identification of intermediates by UPLC-Q-ToF MS.
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