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Issue 25, 2018, Issue in Progress
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A reactive electrochemical filter system with an excellent penetration flux porous Ti/SnO2–Sb filter for efficient contaminant removal from water

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Abstract

Tubular porous Ti/SnO2–Sb filters with excellent penetration flux (∼61.94 m3 m−2 h−1 bar−1) and electrochemical activity were prepared by a sol–gel method using low-cost porous titanium filters as the substrates. The porous Ti/SnO2–Sb filters were used as anodic reactive electrochemical membranes to develop reactive electrochemical filter systems, by combining membrane filtration technology with the electrooxidation process, for water treatment. A convection-enhanced rate constant of 4.35 × 10−4 m s−1 was achieved for Fe(CN)64− oxidation, which approached the kinetic limit and is the highest reported in an electrochemical system. The electrooxidative performance of the reactive electrochemical filter system was evaluated with 50 mg L−1 rhodamine B (RhB). The results showed that the reactive electrochemical filter system in flow-through mode resulted in an 8.6-fold enhancement in RhB oxidation as compared to those in flow-by mode under the same experimental conditions. A normalized rate constant of 5.76 × 10−4 m s−1 for RhB oxidation was observed at an anode potential of 3.04 V vs. SCE, which is much higher than that observed in a reactive electrochemical filter system with carbon nanotubes and/or Ti4O7 (1.7 × 10−5–1.4 × 10−4 m s−1). The electrical energy per order degradation (EE/O) for RhB was as low as 0.28 kW h m−3 in flow-through mode, with a relatively short residence time of 9.8 min. The overall mineralization current efficiency (MCE) was calculated to be 83.6% with ∼99% RhB removal and ∼51% TOC removal. These results illustrate that this reactive electrochemical filter system is expected to be a promising method for water treatment.

Graphical abstract: A reactive electrochemical filter system with an excellent penetration flux porous Ti/SnO2–Sb filter for efficient contaminant removal from water

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Supplementary files

Article information


Submitted
20 Jan 2018
Accepted
26 Mar 2018
First published
16 Apr 2018

This article is Open Access

RSC Adv., 2018,8, 13933-13944
Article type
Paper

A reactive electrochemical filter system with an excellent penetration flux porous Ti/SnO2–Sb filter for efficient contaminant removal from water

K. Yang, H. Lin, S. Liang, R. Xie, S. Lv, J. Niu, J. Chen and Y. Hu, RSC Adv., 2018, 8, 13933
DOI: 10.1039/C8RA00603B

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