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Download fileEnergy-Efficient Electrochemical Strategy for the Oxidative Sequestration of As(III) in Synthesized Anoxic Groundwater
journal contribution
posted on 2018-05-24, 00:00 authored by Bo Jiang, Shuaishuai Xin, Yijie Liu, Congcong Nin, Xuejun Bi, Jianliang XueIn this study, a wave rectified alternating
current (RAC) electrocoagulation
process was developed for the oxidative sequestration of As(III) via
simultaneous generating Fe(II) and O2 in the synthesized
anoxic groundwater. The optimal TFe‑anode/TMMO‑anode:Tpower‑off ratio (T is the time-taken
in corresponding stage) and reaction period for As(III) sequestration
were 1:2:1 and 24 s, respectively. Elevating electric current applied
on the alternate iron/MMO anodes (30–50 mA) and solution pH
(6.0–9.0) promoted As(III) sequestration, whereas the presence
of HCO3– and PO43– deteriorated As(III) sequestration. The intermediate Fe(IV) primarily
accounted for the oxidation of As(III) to As(V), which can be readily
sequestrated by the freshly generated Fe(III) (oxyhydr)oxides. The
energy required for As(III) sequestration in the RAC electrocoagulation
process was only 0.11 kW·h m–3, which is much
less than those in the traditional DC/AC electrocoagulation processes.
Generally, this study offers an energy-efficient strategy to improve
access to safe groundwater for millions of people.