Enhanced photoelectrochemical degradation of Ibuprofen and generation of hydrogen via BiOI-deposited TiO2 nanotube arrays

Hanlin Chen; Yen-Ping Peng; Ting-Yu Chen; Ku-Fan Chen; Ken-Lin Chang; Zhi Dang; Gui-Ning Lu; Hongping He

doi:10.1016/j.scitotenv.2018.03.268

Enhanced photoelectrochemical degradation of Ibuprofen and generation of hydrogen via BiOI-deposited TiO₂ nanotube arrays

Sci Total Environ. 2018 Aug 15:633:1198-1205. doi: 10.1016/j.scitotenv.2018.03.268. Epub 2018 Mar 30.

Authors

Hanlin Chen¹, Yen-Ping Peng², Ting-Yu Chen³, Ku-Fan Chen⁴, Ken-Lin Chang⁵, Zhi Dang⁶, Gui-Ning Lu⁶, Hongping He⁷

Affiliations

¹ CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Guangzhou 510640, PR China; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
² Department of Environmental Science and Engineering, Tunghai University, Taichung 40704, Taiwan. Electronic address: [email protected].
³ Department of Landscape Architecture, National Chin-Yi University of Technology, Taichung 40427, Taiwan.
⁴ Department of Civil Engineering, National Chi Nan University, Nanto 54561, Taiwan.
⁵ Institute of Environmental Engineering, National Sun Yat-Sen University, Kaoshiung 804, Taiwan.
⁶ School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
⁷ CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Guangzhou 510640, PR China.

PMID: 29758872
DOI: 10.1016/j.scitotenv.2018.03.268

Abstract

This study employed BiOI-deposited TiO₂ nanotube arrays (BiOI-TNTAs) electrode in a photoelectrochemical (PEC) system to oxidize Ibuprofen and generate hydrogen in the anodic and cathodic chamber, respectively. FESEM results revealed the diameter of TiO₂ nanotubes was 90-110nm. According to the XRD analysis, the BiOI-TNTAs were dominated by the anatase phase and tetragonal structure of BiOI. XPS results confirmed the coexistence of BiOI in the BiOI-TNTAs associated with Bi (33.76%) and I (8.81%). UV-vis absorption spectra illustrated BiOI-TNTAs exhibit strong absorptions in the visible light region. The PEC method showed the best degradation efficiency for Ibuprofen is a rate constant of 3.21×10^-2min^-1. The results of the Nyquist plot revealed the recombination of photogenerated electron-hole pairs was inhibited as the bias potential was applied. Furthermore, the Bode plot demonstrated the lifetime (τ_el) of photoexcited electrons of BiOI-TNTAs was 1.8 and 4.1 times longer than that of BiOI-Ti and TNTAs, respectively. In the cathodic chamber, the amount of hydrogen generation reached 219.94μM/cm² after 3h of reaction time.

Keywords: BiOI-TNTAs; Ibuprofen; Photoelectrochemical; Synergetic effect.

MeSH terms

Electrochemical Techniques*
Electrodes
Hydrogen / chemistry
Ibuprofen / chemistry*
Models, Chemical*
Nanotubes / chemistry*
Oxidation-Reduction
Titanium / chemistry*

Substances

titanium dioxide
Hydrogen
Titanium
Ibuprofen