Enhancing the photodegradation of tetracycline in aquaculture wastewater via iron(III)-alginate: Degradation pathway transformation and toxicity reduction.
Enhancing the photodegradation of tetracycline in aquaculture wastewater via iron(III)-alginate: Degradation pathway transformation and toxicity reduction.
复制标题
DOI：
10.1016/j.chemosphere.2023.140021
复制
发表时间：
2023-08
期刊：
影响因子：
8.8
通讯作者：
Lianyan Huang;Jiahui Zheng;Jiaqi Ke;Jiahong Pan;Lingling Zhuang;Menglu Zhang;Weifang Zhang
中科院分区：
文献类型：
--
作者：
Lianyan Huang;Jiahui Zheng;Jiaqi Ke;Jiahong Pan;Lingling Zhuang;Menglu Zhang;Weifang Zhang
四环素（TC）在光照下不完全自光解，通常会产生有毒的中间产物，对水环境造成严重危害。为了降低TC自光解的环境风险，开发了海藻酸铁（Fe-SA）水凝胶辅助光催化降解TC的方法，并对其机理进行了分析。在模拟太阳光下，pH为7.0时，2 h内TC的光降解率为61.1%。重要的是，根据QSAR分析，在TC自光解过程中发现的七种中间产物中有四种被发现具有毒性。在相同条件下，添加Fe-SA可使TC的去除率提高到87.4%。此外，只有两个相对较弱的毒性的中间产物后，暴露于Fe-SA光催化系统，表明显着降低了潜在的生态风险所造成的TC自光解。此外，反应性氧化物种（ROS）的测定表明，Fe-SA的添加主要通过辅助自由基（∙OH和∙O2-）光催化降解途径促进TC和相关有毒中间产物的降解。此外，在实际太阳光条件下的光催化应用和Fe-SA的可重复使用性实验进一步证实了其去除TC的有效性和低成本。该研究从自光解过程的角度揭示了TC的光降解机理，为环境中TC污染的去除提供了新的思路。
Tetracycline's (TC) incomplete self-photolysis by light irradiation generally produces toxic intermediate products, which posing serious harm to the aqueous environment. In order to diminish the environmental risks of TC self-photolysis, an iron(III)-alginate (Fe-SA) hydrogel assisted photocatalytic method was developed and the underlying mechanisms was also analyzed in this work. Under simulated sunlight, the photo-degradation efficiency of TC was 61.1% at pH 7.0 within 2 h. Importantly, four of the seven intermediate products that identified during the self-photolysis of TC were found toxic based on QSAR analysis. In contrast, the removal efficiency of TC could be improved to 87.4% by adding Fe-SA under the same conditions. Moreover, only two relatively weakly toxic intermediate products were detected after exposing to the Fe-SA photocatalytic system, indicating a significant reduction of the potential ecological risks caused by TC self-photolysis. Furthermore, the determination of reactive oxidation species (ROS) demonstrated that the addition of Fe-SA primarily facilitated the degradation of TC and the related toxic intermediate products through assisting the free radical (∙OH and ∙O2−) photocatalytic degradation pathway. Additionally, the photocatalytic application under actual sunlight conditions and the reusability experiments of Fe-SA further confirmed its effectiveness and low cost in removing TC. This study revealed the photodegradation mechanisms of TC from the perspective of the self-photolysis process, and also offering new insights into the removal of TC pollution in the environment.