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Indexed by:期刊论文

Date of Publication:2017-07-01

Journal:CHEMICAL ENGINEERING JOURNAL

Included Journals:SCIE、EI

Volume:319

Page Number:212-218

ISSN No.:1385-8947

Key Words:Membrane; Electrochemical oxidation; Carbon nanotube; Adsorption; Microcystin-LR

Abstract:The worldwide presence of harmful micropollutants in water resources drives the development of innovative and energy-efficient water treatment technologies. Herein, a novel carbon-nanotube-(CNT)-based hollow fiber membrane, with a sandwich-like structure in its cross section, is designed and prepared for expanded micropollutant removal under electrochemical assistance. The CNT membranes consist of (1) outer CNT layer as separation layer, (2) middle porous polyvinylidene fluoride layer and (3) inner CNT layer as support. Apart from their intrinsic functions as separation membranes, they can construct a complete electrochemical system, in which two CNT layers are also designed as electrodes and the PVDF layer as insulating separator. Low-concentration microcystin-LR can be cost-efficiently and continuously removed (>99.8%) by these CNT ultrafiltration membranes through facile switches between adsorption and desorption/electrochemical oxidation. Such switches can be achieved at a high flux of 500 L m(-2) h(-1) without terminating filtration process. Degradation product analysis has evidenced the breaking of Mdda chains that are largely responsible for the toxicity of microcystins. This work synergistically combines adsorption and electrochemistry with membrane separation, and highlights their potentials for advanced wastewater treatment and drinking water purification. (C) 2017 Elsevier B.V. All rights reserved.