Joint Laboratory of Guangdong Province and Hong Kong Region on Marine Bioresource Conservation and Exploitation, College of Marine Sciences, South China Agricultural University, Guangzhou, China.
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
Environ Pollut. 2021 May 1;276:116691. doi: 10.1016/j.envpol.2021.116691. Epub 2021 Feb 9.
The environmental-friendly photocatalytic process with a magnetic catalyst CoFeO/TiO mediated by solar light for ibuprofen (IBP) degradation in pure water, wastewater effluent and artificial seawater was investigated systematically. The study aims to reveal the efficiency, the mechanism and toxicity evolution during IBP degradation. Hydroxyl radicals and photo-hole (h) were found to contribute to the IBP decay. The presence of SO showed no significant effect, while NO accelerated the photodegradation, and other anions including HCO, Cl, F, and Br showed significant inhibition. The removal efficiency was significantly elevated with the addition of peroxymonosulfate (PMS) or persulfate (PS) ([Oxidant]:[IBP] = 0.4-4), with reaction rate of 5.3-13.1 and 1.3-2.9 times as high as the control group, respectively. However, the reaction was slowed down with the introduction of HO. A mathematic model was employed to describe the effect of ferrate, high concentration or stepwise addition of ferrate was suggested to play a positive role in IBP photodegradation. Thirteen transformation products were identified and five of them were newly reported. The degradation pathways including hydroxylation, the benzene ring opening and the oxidation of carbon were proposed. IBP can be efficiently removed when spiked in wastewater and seawater despite the decreased degradation rate by 41% and 56%, respectively. Compared to the IBP removal, mineralization was relatively lower. The adverse effect of the parent compound IBP to the green algae Chlorella vulgaris was gradually eliminated with the decomposition of IBP. The transformation product C178a which possibly posed toxicity to rotifers Brachionus calyciflorus can also be efficiently removed, indicating that the photocatalysis process is effective in IBP removal, mineralization and toxicity elimination.
采用 CoFeO/TiO 光催化剂介导的环保光催化工艺，在太阳光下研究了布洛芬（IBP）在纯水、废水和人工海水中的降解。本研究旨在揭示 IBP 降解过程中的效率、机制和毒性演变。研究发现，羟基自由基和光空穴（h）有助于 IBP 的衰减。存在 SO 时，没有明显的影响，而 NO 加速了光降解，其他阴离子包括 HCO、Cl、F 和 Br 则表现出明显的抑制作用。添加过一硫酸盐（PMS）或过硫酸盐（PS）（[氧化剂]：[IBP] = 0.4-4）后，去除效率显著提高，反应速率分别比对照组高 5.3-13.1 和 1.3-2.9 倍。然而，引入 HO 会减缓反应。采用数学模型描述高铁酸盐的影响，建议高铁酸盐的高浓度或分步添加对 IBP 光降解起到积极作用。共鉴定出 13 种转化产物，其中 5 种为新报道。提出了包括羟化、苯环开环和碳氧化在内的降解途径。尽管在废水和海水中的降解速率分别降低了 41%和 56%，但 IBP 仍能有效去除。与 IBP 去除相比，矿化率相对较低。当在废水中添加 IBP 时，母体化合物 IBP 对绿藻小球藻的不良影响随着 IBP 的分解而逐渐消除。可能对轮虫 Brachionus calyciflorus 产生毒性的转化产物 C178a 也能被有效去除，这表明光催化过程在 IBP 去除、矿化和毒性消除方面是有效的。
