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Peroxymonosulfate-assisted photocatalysis with g-C3N4/BiOCOOH nanocomposites for the synergistic removal of organic pollutants
Journal of Water Process Engineering ( IF 6.3 ) Pub Date : 2020-09-16 , DOI: 10.1016/j.jwpe.2020.101580
Haijin Liu , Hui Zhang , Min Chen , Chaonan Zhang , Cuiwei Du , Jianbiao Peng , Kai Jiang

Photocatalysis is an efficacious technology for pollutants degradation; however, there remains ample room for the improvement of its degradation efficiency. Herein, a system involving a g-C3N4/BiOCOOH photocatalyst coupled with peroxymonosulfate (PMS) was developed, using Malachite green (MG), Rhodamine B (RhB), ciprofloxacin hydrochloride (CIP), and levofloxacin hydrochloride (LVF) as target pollutants. The prepared g-C3N4/BiOCOOH nanocomposites were systematically characterized. In contrast to pure g-C3N4 or BiOCOOH, the photocatalytic activities of the nanocomposites were enhanced due to the formation of g-C3N4/BiOCOOH heterojunctions, extensive specific surface areas, and more efficient charge separation. The degradation of RhB, MG, CIP, and LVF was further improved in this g-C3N4/BiOCOOH/PMS system due to the synergistic effects between the photocatalysts and PMS (the degradation of MG in the photocatalyst/PMS system was four fold that of a single photocatalyst system). An exploration of these synergetic mechanisms indicated that ·O2- and 1O2 were the most significant reactive oxygen species in the single photocatalysis system, whereas in the photocatalyst/PMS system, additional 1O2 was generated due to the addition of PMS, and became the dominant species. This research suggests that the combination of photocatalysts and PMS is a feasible strategy for improving the pollutant removal activities of photocatalysts, which have strong potential for myriad applications in environmental remediation.



中文翻译:

gC 3 N 4 / BiOCOOH纳米复合材料的过氧一硫酸盐辅助光催化协同去除有机污染物

光催化是一种有效的污染物降解技术。然而,仍有足够的空间来提高其降解效率。在本文中,开发了一种包含gC 3 N 4 / BiOCOOH光催化剂与过氧一硫酸盐(PMS)偶联的系统,使用孔雀石绿(MG),若丹明B(RhB),盐酸环丙沙​​星(CIP)和盐酸左氧氟沙星(LVF)作为目标污染物。系统地表征了制备的gC 3 N 4 / BiOCOOH纳米复合材料。与纯gC 3 N 4或BiOCOOH相比,由于形成了gC 3 N 4而增强了纳米复合材料的光催化活性。/ BiOCOOH异质结,广泛的比表面积和更有效的电荷分离。在该gC 3 N 4 / BiOCOOH / PMS系统中,由于光催化剂与PMS之间的协同作用,RhB,MG,CIP和LVF的降解得到了进一步改善(光催化剂/ PMS系统中MG的降解是其的四倍)。单一光催化剂系统)。对这些协同机制的探索表明,· O 21 O 2是单一光催化系统中最重要的活性氧,而在光催化剂/ PMS系统中,另外1 O 2由于添加了PMS而产生了碳,并成为优势种。这项研究表明,光催化剂和PMS的组合是提高光催化剂污染物去除活性的可行策略,在环境修复中有广泛的应用潜力。

更新日期:2020-09-16
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