Kiani Mahsa, Bagherzadeh Mojtaba, Kaveh Reyhaneh, Rabiee Navid, Fatahi Yousef, Dinarvand Rassoul, Jang Ho Won, Shokouhimehr Mohammadreza, Varma Rajender S
Department of Chemistry, Sharif University of Technology, P.O. Box 11155-3516, Tehran 14155-6451, Iran.
Department of Pharmaceutical Nanotechnology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran 14155-6451, Iran.
Nanomaterials (Basel). 2020 Nov 23;10(11):2320. doi: 10.3390/nano10112320.
Decorating photocatalysts with noble metal nanoparticles (e.g., Pt) often increases the catalysts' photocatalytic activity and biomedical properties. Here, a simple and inexpensive method has been developed to prepare a Pt-AgPO/CdS/chitosan composite, which was characterized and used for the visible light-induced photocatalytic and antibacterial studies. This synthesized composite showed superior photocatalytic activity for methylene blue degradation as a hazardous pollutant (the maximum dye degradation was observed in 90 min of treatment) and killing of Gram positive bacterial ( and ) as well as Gram negative bacteria (, , , and ) under visible light irradiation. The antibacterial activity of CdS, CdS/AgPO, and Pt-AgPO/CdS/chitosan against , , , , , and showed the zone of inhibition (mm) under visible light and under dark conditions at a concentration of 20 µg mL. Furthermore, the cell viability of the CdS/chitosan, AgPO, AgPO/CdS/chitosan, and Pt-AgPO/CdS/chitosan were investigated on the human embryonic kidney 293 cells (HEK-293), Henrietta Lacks (HeLa), human liver cancer cell line (HepG2), and pheochromocytoma (PC12) cell lines. In addition, the results indicated that the photodegradation rate for Pt-AgPO/CdS/chitosan is 3.53 times higher than that of CdS and 1.73 times higher than that of the CdS/AgPO composite. Moreover, Pt-AgPO/CdS/chitosan with an optimal amount of CdS killed large areas of different bacteria and different cells separately in a shorter time period under visible-light irradiation, which shows significantly higher efficiency than pure CdS and other CdS/AgPO composites. The superb performances of this composite are attributed to its privileged properties, such as retarded recombination of photoinduced electron/hole pairs and a large specific surface area, making Pt-AgPO/CdS/chitosan a valuable composite that can be deployed for a range of important applications, such as visible light-induced photocatalysis and antibacterial activity.
用贵金属纳米颗粒（如铂）修饰光催化剂通常会提高催化剂的光催化活性和生物医学性能。在此，已开发出一种简单且廉价的方法来制备Pt-AgPO/CdS/壳聚糖复合材料，对其进行了表征，并将其用于可见光诱导的光催化和抗菌研究。这种合成的复合材料对作为有害污染物的亚甲基蓝降解表现出优异的光催化活性（在90分钟的处理中观察到最大染料降解），并且在可见光照射下对革兰氏阳性细菌（和）以及革兰氏阴性细菌（、、和）具有杀灭作用。CdS、CdS/AgPO和Pt-AgPO/CdS/壳聚糖对、、、、、和的抗菌活性在可见光和黑暗条件下、浓度为20μg mL时显示出抑菌圈（毫米）。此外，还研究了CdS/壳聚糖、AgPO、AgPO/CdS/壳聚糖和Pt-AgPO/CdS/壳聚糖对人胚肾293细胞（HEK-293）、海拉细胞（HeLa）、人肝癌细胞系（HepG2）和嗜铬细胞瘤（PC12）细胞系的细胞活力。此外，结果表明Pt-AgPO/CdS/壳聚糖的光降解速率比CdS高3.53倍，比CdS/AgPO复合材料高1.73倍。此外，含有最佳量CdS的Pt-AgPO/CdS/壳聚糖在可见光照射下能在较短时间内分别杀死大面积的不同细菌和不同细胞，其效率明显高于纯CdS和其他CdS/AgPO复合材料。这种复合材料的优异性能归因于其独特的性质，如光生电子/空穴对的复合延迟和大比表面积，使得Pt-AgPO/CdS/壳聚糖成为一种有价值的复合材料，可用于一系列重要应用，如可见光诱导的光催化和抗菌活性。
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