Citation: Guohong Xie, Xin Chang, Bal Ram Adhikari, Sapanbir S. Thind, Aicheng Chen. Photoelectrochemical degradation of acetaminophen and valacyclovir using nanoporous titanium dioxide[J]. Chinese Journal of Catalysis, ;2016, 37(7): 1062-1069. doi: 10.1016/S1872-2067(15)61101-9 shu

Photoelectrochemical degradation of acetaminophen and valacyclovir using nanoporous titanium dioxide

a. College of Resources and Environment, Henan Institute of Science and Technology, Xinxiang 453003, Henan, China;
b. Department of Chemistry, Lakehead University, Thunder Bay, Ontario P7B 5E1, Canada

Received Date: 20 March 2016
Revised Date: 12 April 2016

Fund Project: This work was supported by a Discovery Grant from the Natural Sciences and Engineering Research Council of Canada (NSERC). G. H. Xie thanks the State Scholarship Fund of China Scholarship Council (CSC) and the Natural Science Foundation of Henan Province (122300410177).

Electrochemically treated nanoporous TiO₂ was employed as a novel electrode to assist in the photoelectrochemical degradation of acetaminophen and valacyclovir. The prepared electrode was characterized by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Cyclic voltammetry (CV), Mott-Schottky plots, ultraviolet-visible light (UV-vis) absorbance spectroscopy, and a total organic carbon (TOC) analyzer were employed to investigate the photoelectrochemical degradation of acetaminophen and valacyclovir. The results indicated no obvious removal of acetaminophen and valacyclovir over 3 h when separate photochemical degradation and electrochemical oxidation were employed. In contrast, acetaminophen and valacyclovir were rapidly eliminated via photoelectrochemical degradation. In addition, electrochemically treated nanoporous TiO₂ electrodes significantly enhanced the efficacy of the photoelectrochemical degradation of acetaminophen and valacyclovir, by 86.96% and 53.12%, respectively, when compared with untreated nanoporous TiO₂ electrodes. This enhanced performance may have been attributed to the formation of Ti³⁺, Ti²⁺, and oxygen vacancies, as well as an improvement in conductivity during the electrochemical reduction process. The effect of temperature was further investigated, where the activation energy of the photoelectrochemical degradation of acetaminophen and valacyclovir was determined to be 9.62 and 18.42 kJ/mol, respectively.
- Photoelectrochemical degradation,
- Nanoporous titanium dioxide,
- Acetaminophen,
- Valacyclovir,
- Activation energy
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