Gnanasekaran Lalitha, Pachaiappan Rekha, Kumar P Senthil, Hoang Tuan K A, Rajendran Saravanan, Durgalakshmi D, Soto-Moscoso Matias, Cornejo-Ponce Lorena, Gracia F
Laboratorio de Investigaciones Ambientales Zonas Áridas, Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Tarapacá, Avda. General Velásquez 1775, Arica, Chile.
Department of Sustainable Energy Management, Stella Maris College, Chennai, 600086, Tamilnadu, India.
Environ Pollut. 2021 Oct 15;287:117304. doi: 10.1016/j.envpol.2021.117304. Epub 2021 May 5.
The treatment of industrial waste and harmful bacteria is an important topic due to the release of toxins from the industrial pollutants that damage the water resources. These harmful sources frighten the life of every organism which was later developed as the carcinogenic and mutagenic agents. Therefore, the current study focuses on the breakdown or degradation of 4-chlorophenol and the antibacterial activity against Escherichia coli (E. coli). As a well-known catalyst, pure titanium-di-oxide (TiO) had not shown the photocatalytic activity in the visible light region. Hence, band position of TiO need to be shifted to bring out the absorption in the visible light region. For this purpose, the n-type TiO nanocrystalline material's band gap got varied by adding different ratios of p-type CuO. The result had appeared in the formation of p (CuO) - n (TiO) junction synthesized from sol-gel followed by chemical precipitation methods. The optical band gap value was determined by Kubelka-Munk (K-M) plot through UV-Vis diffusive reflectance spectroscopy (DRS). Further, the comprehensive mechanism and the results of photocatalytic and antibacterial activities were discussed in detail. These investigations are made for tuning the TiO catalyst towards improving or eliminating the existing various environmental damages.
由于工业污染物释放的毒素会破坏水资源，工业废物和有害细菌的处理是一个重要课题。这些有害源威胁着每个生物体的生命，后来被确认为致癌和诱变剂。因此，当前的研究集中在4-氯苯酚的分解或降解以及对大肠杆菌（E. coli）的抗菌活性上。作为一种著名的催化剂，纯二氧化钛（TiO₂）在可见光区域未表现出光催化活性。因此，需要改变TiO₂的能带位置以使其在可见光区域产生吸收。为此，通过添加不同比例的p型氧化铜（CuO）来改变n型TiO₂纳米晶体材料的带隙。结果表明，通过溶胶-凝胶法和化学沉淀法合成了p（CuO）-n（TiO₂）结。通过紫外-可见漫反射光谱（DRS），利用库贝尔卡-蒙克（K-M）图确定了光学带隙值。此外，还详细讨论了光催化和抗菌活性的综合机制及结果。进行这些研究是为了调整TiO₂催化剂，以改善或消除现有的各种环境破坏。
