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Photodegradation of metoprolol using a porphyrin as photosensitizer under homogeneous and heterogeneous conditions
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2018-11-16 , DOI: 10.1016/j.jhazmat.2018.11.055
Cláudia M.B. Neves , Olga M.S. Filipe , Nuno Mota , Sónia A.O. Santos , Armando J.D. Silvestre , Eduarda B.H. Santos , M. Graça P.M.S. Neves , Mário M.Q. Simões

Porphyrins are known as effective photosensitizers and can be an interesting key in phototreatment of water contaminated with micropollutants such as pharmaceuticals. They already showed to be efficient photocatalysts for the degradation of dyes, chlorophenols and other pollutants. This work demonstrates the applicability of 5,10,15,20-tetrakis(pentafluorophenyl)porphyrin (H2TF5PP) as photosensitizer for treatment of water contaminated with metoprolol, a highly prescribed β-blocker, which is not completely removed in sewage treatment plants. Studies were firstly developed under homogeneous conditions with simulated solar radiation and porphyrin was found to be efficient in the photodegradation of metoprolol, following a pseudo-first order kinetics with ca. 90% metoprolol degradation after 12 h. Experiments in presence of scavengers confirmed the mechanism of degradation via singlet oxygen. Appearance of several new peaks in HPLC chromatograms indicates the formation of products, identified by HPLC-MSn. Furthermore, the porphyrin was immobilized on a silica support and used as heterogeneous photocatalyst in degradation of metoprolol. Experiments using this heterogeneous photocatalyst under real solar irradiation were also performed, and similar results were obtained. Kinetic comparison of metoprolol photodegradation in buffer solution and in real wastewater treatment plant effluent showed that the efficiency of the immobilized porphyrin was not decreased by the complex matrix of the effluent.



中文翻译:

使用卟啉作为光敏剂在均相和非均相条件下光降解美托洛尔

卟啉被认为是有效的光敏剂,并且在光处理被药物等微污染物污染的水中可能是一个有趣的关键。他们已经被证明是降解染料,氯酚和其他污染物的有效光催化剂。这项工作证明了5,10,15,20-四(五氟苯基)卟啉(H 2 TF 5 PP)作为光敏剂,用于处理被美托洛尔(一种高度处方的β受体阻滞剂)污染的水,该物质在污水处理厂中并未完全去除。首先在均质条件下用模拟的太阳辐射开展研究,并发现卟啉可有效地抑制美托洛尔的光降解,其动力学近似为。12小时后90%的美托洛尔降解。在清除剂存在下的实验证实了单线态氧降解的机理。在HPLC色谱几个新的峰出现表明的产物的形成,通过HPLC-MS鉴定Ñ。此外,将卟啉固定在二氧化硅载体上,并用作美托洛尔降解中的非均相光催化剂。还进行了使用这种多相光催化剂在真实太阳辐射下的实验,并获得了相似的结果。缓冲溶液和实际废水处理厂废水中美托洛尔光降解的动力学比较表明,废水中的复杂基质不会降低固定化卟啉的效率。

更新日期:2019-02-26
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