光催化
纳米棒
降级(电信)
吸附
光化学
兴奋剂
碳纤维
材料科学
化学
可见光谱
化学工程
纳米技术
有机化学
复合材料
催化作用
光电子学
复合数
电信
计算机科学
工程类
作者
Xianbo Sun,Ying Pan,Yanyu Song,Wen Liu,Long D. Nghiem,Qilin Wang,Zhengqing Cai
标识
DOI:10.1016/j.ese.2022.100219
摘要
A novel carbon quantum dots decorated C-doped α-Bi2O3 photocatalyst (CBO/CQDs) was synthesized by solvothermal method. The synergistic effect of adsorption and photocatalysis highly improved contaminants removal efficiencies. The ceftriaxone sodium degradation rate constant (k) of CBO/CQDs was 11.4 and 3.2 times that of pure α-Bi2O3 and C-doped α-Bi2O3, respectively. The interstitial carbon doping generated localized states above the valence band, which enhanced the utilization of visible light and facilitated the separation of photogenerated electrons and holes; the loading of CQDs improved the charge carrier separation and extended the visible light response; the reduced particle size of CBO/CQDs accelerated the migration of photogenerated carriers. The •O2- and h+ were identified as the dominant reactive species in ceftriaxone sodium degradation, and the key role of •O2- was further investigated by NBT transformation experiments. The Fukui index was applied to ascertain the molecular bonds of ceftriaxone sodium susceptible to radical attack, and intermediates analysis was conducted to explore the possible degradation pathways. The toxicity evaluation revealed that some degradation intermediates possessed high toxicity, thus the contaminants require sufficient mineralization to ensure safe discharge. The present study makes new insights into synchronous carbon dopping and CQDs decoration on modification of α-Bi2O3, which provides references for future studies.
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