Universidade Estadual Do Rio Grande Do Sul (Uergs), Unidade Litoral Norte, Rua Machado de Assis, 1456, Bairro Sulbrasileiro, Osório, RS, Brazil.
Universidade Estadual Do Rio Grande Do Sul (Uergs), Unidade Litoral Norte, Rua Machado de Assis, 1456, Bairro Sulbrasileiro, Osório, RS, Brazil.
J Environ Manage. 2021 Nov 1;297:113296. doi: 10.1016/j.jenvman.2021.113296. Epub 2021 Jul 27.
Photocatalysis has been applied for the elimination or reduction concentration of emerging pollutants in water. One of them, is the moxifloxacin (MOX), a fluoroquinolone that have a potential to develop resistant bacteria and have been present toxicity. The MOX achieves the environment due to inefficient wastewater treatment and incorrect disposal. Aiming to find a sustainable solution for photocatalytic process, compound parabolic concentrator (CPC) reactors have been proposed. In this sense, the present study investigates the application of CPC reactor for the degradation of MOX using sunlight and artificial light (UV-A lamp). In addition, the acute toxicity for L. sativa seeds and A. cepa bulbs, as well as the MOX cytotoxicity and genotoxicity for A. cepa root were investigated before and after treatment. The MOX degradation was around 65% using the sunlight and 44% with the artificial light. This difference was due to the kind of incident radiation (direct and diffuse), as well as the type of radiation (visible and/or ultraviolet) used in the processes. For L. sativa the acute toxicity was eliminated after MOX treatment using sunlight. A. cepa root length increased before the treatment and reduced significantly after it, what can indicate hormesis occurrence. MOX cytotoxicity was not observed. In contrast, genotoxicity assays showed high frequency of chromosomal aberrations for MOX solution, indicating elevated genotoxicity that was eliminated after solar treatment. The transformation products of MOX after CPC reactor solar treatment did not show cytotoxicity and genotoxicity in A. cepa and acute toxicity in L. Sativa. The results indicates that photocatalysis in a CPC solar reactor is efficient for MOX toxicity removal in the treated solutions.
光催化已被应用于消除或降低水中新兴污染物的浓度。其中之一是莫西沙星（MOX），一种氟喹诺酮类药物，有产生耐药菌的潜力，并具有潜在的毒性。由于废水处理效率低下和处置不当，MOX 进入环境。为了寻找光催化过程的可持续解决方案，已经提出了复合抛物面聚光器（CPC）反应器。从这个意义上说，本研究调查了 CPC 反应器在使用阳光和人工光（UV-A 灯）降解 MOX 的应用。此外，还研究了 MOX 对天蓝遏蓝菜种子和洋葱鳞茎的急性毒性，以及 MOX 对洋葱根尖的细胞毒性和遗传毒性，分别在处理前后进行。使用阳光时，MOX 的降解率约为 65%，使用人工光时为 44%。这种差异是由于辐射的种类（直射和漫射）以及过程中使用的辐射类型（可见和/或紫外线）所致。对于天蓝遏蓝菜，用阳光处理 MOX 后，急性毒性被消除。洋葱根尖长度在处理前增加，处理后显著减少，这可能表明存在激素作用。未观察到 MOX 的细胞毒性。相反，遗传毒性检测表明 MOX 溶液的染色体畸变频率很高，表明遗传毒性升高，而经过太阳能处理后则消除了这种遗传毒性。CPC 太阳能反应器处理后的 MOX 转化产物在洋葱根尖中未显示出细胞毒性和遗传毒性，在天蓝遏蓝菜中也未显示出急性毒性。结果表明，CPC 太阳能反应器中的光催化对处理溶液中 MOX 毒性的去除是有效的。
