Simultaneous Adsorption and Electrochemical Reduction of N-Nitrosodimethylamine using Carbon-TiO Composite Reactive Electrochemical Membranes.

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ID: 765
2018
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Abstract
This study focused on synthesis and characterization of Ti4O7 reactive electrochemical membranes (REMs) amended with powder activated carbon (PAC) or multi-walled carbon nanotubes (MWCNTs). These composite REMs were evaluated for simultaneous adsorption and electrochemical reduction of N-Nitrosodimethylamine (NDMA). The carbon-Ti4O7 composite REMs had high electrical conductivities (1832 to 2991 S m-1), where carbon and Ti4O7 were in direct electrical contact. Addition of carbonaceous materials increased the residence times of NDMA in the REMs by a factor of 3.8 to 5.4 and therefore allowed for significant electrochemical NDMA reduction. The treatment of synthetic solutions containing 10 M NDMA achieved > 4-log NDMA removal in a single pass (liquid residence time of 11 to 22 s) through the PAC-REM and MWCNT-REM with the application of a -1.1 V/SHE cathodic potential, with permeate concentrations between 18 and 80 ng L-1. The treatment of a 6.7 nM NDMA-spiked surface water sample, under similar operating conditions (liquid residence time of 22 s), achieved 92 to 97% removal with permeate concentrations between 16 and 40 ng L-1. Density functional theory calculations determined a probable reaction mechanism for NDMA reduction, where the rate-limiting step was a direct electron transfer reaction.
Reference Key
almassi2018simultaneous Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Almassi, Soroush;Li, Zhao;Xu, Wenqing;Pu, Changcheng;Zeng, Teng;Chaplin, Brian P;
Journal Environmental science & technology
Year 2018
DOI
10.1021/acs.est.8b05933
URL
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