期刊
CHEMICAL ENGINEERING JOURNAL
卷 420, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129582
关键词
Photocatalysis; Adsorption; Carbonized eggshell membrane; BiOCl; Oxygen vacancy; Water treatment
资金
- National Natural Science Foundation of China [21607064, 21707055]
- Youth Key Project of Natural Science Foundation of Jiangxi Province [20192ACBL20014, 20192ACBL21011]
- Natural Science Foundation of Jiangxi Province [20181BAB203018, 20181BAB213010]
- Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology
- University of Cincinnati through the Herman Schneider Professorship in the College of Engineering and Applied Sciences
A series of carbon quantum dots-decorated BiOCl/carbonized eggshell membrane composites were synthesized with CEMs as bio-templates, exhibiting superior removal efficiencies for organic pollutants through synergistic effect of adsorption and photocatalysis.
A series of carbon quantum dots (CQDs)-decorated BiOCl/carbonized eggshell membrane (CEM) composites were synthesized with CEMs as bio-templates. The obtained composites, especially BiC-0.05, exhibited superior removal efficiencies of several organic pollutants, i.e. tetracycline hydrochloride (TC), Rhodamine B (RhB), and o-nitrophenol (NP). Approximately, 98% of TC was removed after 30 min dark adsorption and subsequent 30 min visible-light-initiated photocatalytic degradation. BiC-0.05 was also utilized to treat actual industrial wastewater and could reduce 73.1% COD, in comparison to 49.9% with the use of BiOCl. The boosted removal efficiencies were achieved by synergistic effect of adsorption and photocatalysis, where cooperative contribution of oxygen vacancies (OVs), CEMs and CQDs enabled faster charge migration and more effective separation of photogenerated charge carriers. Electron spin resonance (ESR) and trapping experimental results showed that superoxide radical (O-center dot(2)-), along with holes (h(+)) and hydroxyl radical ((OH)-O-center dot) would take part in photocatalytic degradation process. The intermediates of TC and its possible degradation pathway during the photocatalytic reaction were also studied. Our work developed a novel strategy by integrating carbon nanomaterials derived from bio-waste to design efficient photocatalysts for remediation of organic contaminants via adsorption - photocatalysis synergism and OVs - CQDs cooperation.
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