光催化
铜
诺氟沙星
兴奋剂
吸附
材料科学
溶剂热合成
晶体结构
铋
可见光谱
化学工程
降级(电信)
光化学
化学
催化作用
光电子学
冶金
有机化学
抗生素
电信
生物化学
环丙沙星
计算机科学
工程类
作者
Xincong Lv,Dickson Y.S. Yan,Frank Leung Yuk Lam,Yun Hau Ng,Shengming Yin,Alicia Kyoungjin An
标识
DOI:10.1016/j.cej.2020.126012
摘要
Photocatalysts based on copper-doped bismuth oxybromide (Cu-doped BiOBr) were synthesised using a solvothermal method and assessed for their ability to degrade norfloxacin under visible light. The Cu atoms were successfully doped into the crystal lattice of BiOBr, yielding Cu-doped BiOBr microflowers with a morphology and crystal structure identical to that of pristine BiOBr. The as-prepared Cu-doped BiOBr showed activity superior to BiOBr in the photocatalytic degradation of norfloxacin under visible-light irradiation, which was attributed to its improved light-harvesting properties, enhanced charge separation and interfacial charge transfer. Furthermore, we found for the first time that the introduction of Cu into BiOBr enhanced the adsorption capacity between the photocatalyst and norfloxacin, which we considered to be the main contribution to its improved performance. Cu-doped BiOBr containing the optimal proportion of Cu and Bi (Cu:Bi = 0.03) had a photocatalytic degradation constant of 0.64 ×10−2 min−1, which is 2.28 times higher than that of undoped BiOBr. The primary oxidation pathway was determined to involve the transfer of photogenerated holes to norfloxacin. Finally, we demonstrated that the Cu-doped BiOBr photocatalyst retained 95% of its initial activity even after five successive catalytic cycles, confirming its recyclability.
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