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首页> 外文期刊>Materials science & engineering >Effectiveness of reactive oxygen species generated from rGO/CdS QD heterostructure for photodegradation and disinfection of pollutants in waste water
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Effectiveness of reactive oxygen species generated from rGO/CdS QD heterostructure for photodegradation and disinfection of pollutants in waste water

机译：rGO / CdS QD异质结构产生的活性氧对废水中污染物的光降解和消毒的有效性

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The present study investigates the role of reactive oxygen species (ROS) generated on surface of nanophoto-catalyst in wastewater treatment discharged from exponentially growing industries. A facile synthetic route is presented to produce reduced graphene oxide/CdS quantum dot (rGO/CdS QD) heterostructure by monowave-assisted solvothermal method where room temperature ionic liquid 1-ethyl-3-methylimidazolium thiocyanate serves as a "green" precursor. The prepared photocatalyst was tested for: (1) photodegradation performance against various cationic dyes, anionic dyes, and antibiotics as model organic water pollutants; and (2) disinfection performance against gram-positive S. aureus and gram-negative E. coli bacterial strains as pathogenic water pollutants. The negative surface charge of rGO/CdS QD precisely attracted the cationic dye molecules to its surface and degraded the dyes at a higher rate. Moreover, excellent antibacterial activity of rGO/CdS QD were observed against S. aureus and E. coli with a minimum inhibitory concentration of 16 mu g ml(-1) and 32 mu g ml(-1), respectively. A plausible mechanism of the photocatalytic activity suggested that ROS with strong oxidizing ability reacts with the organic pollutants to mineralize them into CO2, H2O or some other small molecules, and reacts with pathogens to damage the macromolecules like proteins, lipids, DNA, etc in the bacterial cells. Among all the surface generated ROS, hydroxyl radicals was found to be the main contributor in the photodegradation and disinfection mechanism.
机译：本研究调查了纳米光催化剂表面产生的活性氧（ROS）在指数增长的工业废水处理中的作用。提出了一种简便的合成路线，通过单波辅助溶剂热法生产还原的氧化石墨烯/ CdS量子点（rGO / CdS QD）异质结构，其中室温离子液体1-乙基-3-甲基咪唑硫氰酸盐用作“绿色”前体。测试了制备的光催化剂的性能：（1）针对各种阳离子染料，阴离子染料和抗生素作为模型有机水污染物的光降解性能; （2）对革兰氏阳性金黄色葡萄球菌和革兰氏阴性大肠杆菌细菌菌株作为致病性水污染物的消毒性能。 rGO / CdS QD的负表面电荷精确地将阳离子染料分子吸引到其表面，并以较高的速率降解染料。此外，观察到rGO / CdS QD对金黄色葡萄球菌和大肠杆菌具有极好的抑菌活性，最低抑菌浓度分别为16μgml（-1）和32μgml（-1）。可能的光催化活性机制表明，具有强氧化能力的ROS与有机污染物发生反应，使它们矿化为CO2，H2O或其他一些小分子，并与病原体发生反应，从而破坏了蛋白质，脂质，DNA等大分子。细菌细胞。在所有表面产生的ROS中，发现羟基自由基是光降解和消毒机理的主要贡献者。

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