Packed-Bed Electrode Reactor

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Packed-Bed Electrode Reactor ( packed-bed-electrode-reactor )

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Int. J. Electrochem. Sci., 13 (2018) 7301 – 7309, doi: 10.20964/2018.08.59 International Journal of ELECTROCHEMICAL SCIENCE www.electrochemsci.org Electrochemical Investigation of Phenol Oxidation by a TiO2/GAC Based Packed-Bed Electrode Reactor Qing Chen1, Lizhang Wang1,*, Yuehua Xu1, Peng Li2, Xiao Wang1, Mingze Wang1, Ying Kong1 1 School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou City, Jiangsu 221116, PR China; 2 School of Water Resource & Environmental Engineering, East China Institute of Technology, Nanchang, Jiangxi 330013, PR China *E-mail: wlzh0731@126.com Received: 2 April 2018 / Accepted: 1 June 2018 / Published: 5 July 2018 In this work, TiO2/GAC was prepared by sol-gel method and employed as particulate electrode for efficient phenol oxidation. The X-ray Diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis reveal the titanium dioxide loaded on GAC exists in anatase TiO2 state. Compared to the GAC electrode, the TiO2/GAC can enhance feedback current and catalytic-oxidation ability, which could be obtained through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements. Furthermore, the excellent electrochemical performance of TiO2/GAC is validated by the increase of phenol and chemical oxygen demand (COD) removal and obvious decrease of the power consumption during bulk electrolysis of phenolic wastewater. Keywords: phenol; TiO2/GAC; packed-bed electrode reactor; catalytic-oxidation performance 1. INTRODUCTION During the past several decades, electrochemical processes with unique features of simplicity, robustness and high operation efficiency have been introduced into treating wastewater containing different organic pollutants [1-3]. The dimensionally stable anodes (DSAs) are usually employed due to their strong ability in producing reactive hydroxyl radicals (·OH) which are responsible for effective electro-oxidation. To further improve the electrode performances, a three dimension structure equipped with granular activated carbon (GAC) is developed to expand electrode area via GAC bipolarity in the electric field [4-6]. However, this kind of framework is still restricted by excessive oxygen evolution of carbon material and cost-efficient goal toward electro-oxidation is difficult to be achieved through this way. As known that usage of the metal oxide e.g. SnO2 [7, 8] and PbO2 [9, 10] could effectively

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