Degradations of acetaminophen via a K2S2O8-doped TiO2 photocatalyst under visible light irradiation

doi:10.1016/j.chemosphere.2016.04.059

CNU IR > College of Sustainable Environment and Recreation > Dept. of Environmental Resources Management > Periodical Articles > Item 310902800/30923

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Title:	Degradations of acetaminophen via a K2S2O8-doped TiO2 photocatalyst under visible light irradiation
Authors:	Lin, Justin Chun-Te de Luna, Mark Daniel G. Aranzamendez, Graziel L. Lu, Ming-Chun
Contributors:	Feng Chia Univ, Dept Environm Engn & Sci Univ Philippines Diliman, Dept Chem Engn Chia Nan Univ Pharm & Sci, Dept Environm Resources Management
Keywords:	Potassium persulfate TiO2 Visible light active catalyst Acetaminophen Doping Photocatalytic degradation parameters photodegradation
Date:	2016-07
Issue Date:	2018-01-18 11:38:00 (UTC+8)
Publisher:	Pergamon-Elsevier Science Ltd
Abstract:	Acetaminophen (ACT) is a mild analgesic commonly used for relief of fever, headache and some minor pains. It had been detected in both fixed factory-discharged wastewaters, and diverse sources, e.g. surface waters during festival events. Degradation of such trace emergent pollutants by titanium dioxide (TiO2) photocatalysts is a common approach; however, the band gap that can be utilized in the UV range is limited. In order to extend downward the energy required to excite the photocatalytic material, doping with potassium peroxodisulfate (K2S2O8) by a sol-gel method was done in this work. The visible-light active photocatalyst was tested on the degradation of ACT under four parameters including: initial ACT concentration, catalyst dose, initial pH, and system temperature. Optimal conditions, which achieved 100% ACT degradation, were obtained by using 0.1 mM ACT initial concentration, catalyst dose of 1 g L-1, initial pH of 9.0 and system temperature of 22 degrees C at the end of 9-h irradiation. Meanwhile, three types of degradation kinetic models (i.e. zero, pseudo first and second order) were tested. The feasible model followed a pseudo-first order model with the computed constant (k(app)) of 7.29 x 10(-3) min(-1). The present study provides a better photocatalytic degradation route by K2S2O8-modified TiO2 in comparison with pristine TiO2, in wastewater treatment dealing with ACT and other persistent organic pollutants. (C) 2016 Elsevier Ltd. All rights reserved.
Relation:	Chemosphere, v.155, pp.388-394
Appears in Collections:	[Dept. of Environmental Resources Management] Periodical Articles

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