Elimination of the Emerging Contaminants Amitriptyline Hydrochloride, Methyl Salicylate, and 2-Phenoxyethanol in Ultrapure Water and Secondary Effluents by Photolytic and Radicalary Pathways
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- 作者：Francisco J. Real ; F. Javier Benitez ; Juan L. Acero ; Gloria Roldan ; Francisco Casas
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2012
- 出版时间：December 19, 2012
- 年：2012
- 卷：51
- 期：50
- 页码：16209-16215
- 全文大小：299K
- 年卷期：v.51,no.50(December 19, 2012)
- ISSN：1520-5045
文摘
Chemical degradation of the pharmaceuticals and personal care products (PPCPs) amitriptyline hydrochloride, methyl salicylate, and 2-phenoxyethanol by means of several advanced oxidation processes, including 254 nm UV radiation and Fenton鈥檚 reagent, has been studied in different water matrixes, such as ultrapure (UP) and surface waters and two secondary effluents from wastewater treatment plants. The influence of the operating variables on the elimination of these compounds in UP water was established, and kinetic parameters for their degradation, such as quantum yields along a pH range of 3鈥?1 and second-order rate constants for their oxidation by hydroxyl radicals, were determined. Specifically, for the reactions of oxidation of the three PPCPs with hydroxyl radicals, the use of a competition kinetic model in Fenton鈥檚 reagent experiments allowed evaluation of their rate constants, whose values were (10.3 卤 0.3) 脳 109 M鈥?路s鈥? for amitriptyline hydrochloride, (7.1 卤 0.1) 脳 109 M鈥?路s鈥? for methyl salicylate, and (4.3 卤 0.1) 脳 109 M鈥?路s鈥? for 2-phenoxyethanol. Furthermore, the simultaneous oxidation of these selected PPCPs in three different water systems (surface water from a reservoir and two secondary effluents) was studied, and the influence of the operating conditions on the removal efficiency was established. Finally, a kinetic model was proposed for the prediction of the elimination of these compounds by UV radiation and a UV/H2O2 system in these water matrixes, with theoretical results that agreed well with the experimental ones.