Jaramillo-Fierro Ximena, Cuenca María Fernanda
Departamento de Química, Facultad de Ciencias Exactas y Naturales, Universidad Técnica Particular de Loja, San Cayetano Alto, Loja 1101608, Ecuador.
Departamento de Producción, Facultad de Ciencias Exactas y Naturales, Universidad Técnica Particular de Loja, San Cayetano Alto, Loja 1101608, Ecuador.
Nanomaterials (Basel). 2022 Dec 30;13(1):173. doi: 10.3390/nano13010173.
The use of semiconductors for bacterial photoinactivation is a promising approach that has attracted great interest in wastewater remediation. The photoinactivator Cu-TTC/ZTO/TO was synthesized by the solvothermal method from the coordination complex Cu(CHNS) (Cu-TTC) and the hybrid semiconductor ZnTiO/TiO (ZTO/TO). In this study, the effect of photocatalyst composition/concentration as well as radiation intensity on the photoinactivation of the gram-negative bacteria and the gram-positive bacteria in aqueous solutions was investigated. The results revealed that 25 mg/mL of photoinactivator, in a Cu-TTC:ZTO/TO molar ratio of 1:2 (/%) presents a higher rate of bacterial photoinactivation under simulated solar light (λ = 300-800 nm) in comparison to the individual components. The evidence of this study suggests that the presence of the Cu(CHNS) coordination complex in the ZnTiO/TiO hybrid semiconductor would contribute to the generation of reactive oxygen species (ROS) that are essential to initiate the bacterial photoinactivation process. Finally, the results obtained allow us to predict that the Cu-TTC/ZTO/TO photocatalyst could be used for effective bacterial inactivation of and in aqueous systems under simulated solar light.
利用半导体进行细菌光灭活是一种很有前景的方法，在废水处理方面引起了极大关注。光灭活剂Cu-TTC/ZTO/TO通过溶剂热法由配位络合物Cu(CHNS)（Cu-TTC）和混合半导体ZnTiO/TiO（ZTO/TO）合成。在本研究中，研究了光催化剂组成/浓度以及辐射强度对水溶液中革兰氏阴性菌和革兰氏阳性菌光灭活的影响。结果表明，与单独的组分相比，Cu-TTC:ZTO/TO摩尔比为1:2（/%）的25 mg/mL光灭活剂在模拟太阳光（λ = 300 - 800 nm）下呈现出更高的细菌光灭活速率。本研究的证据表明，ZnTiO/TiO混合半导体中Cu(CHNS)配位络合物的存在有助于产生活性氧（ROS），这是启动细菌光灭活过程所必需的。最后，所获得的结果使我们能够预测，Cu-TTC/ZTO/TO光催化剂可用于在模拟太阳光下对水溶液中的 和 进行有效的细菌灭活。
