Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Removal of As(V) from wastewaters using magnetic iron oxides formed by zero-valent iron electrocoagulation

Journal Article · · Journal of Environmental Management
 [1];  [2];  [2];  [3];  [2]
  1. Huazhong Agricultural University, Wuhan (China); OSTI
  2. Huazhong Agricultural University, Wuhan (China)
  3. University of Connecticut, Storrs, CT (United States)
Electrocoagulation of zero-valent iron has been widely applied to the removal of dissolved arsenic, but the solid-liquid separation of arsenic-containing precipitates remains technically challenging. In this work, zero-valent iron was electrochemically oxidized to magnetic iron oxides for the removal of As(V) from simulated and actual mining wastewaters. The results indicated that lepidocrocite was formed when zero-valent iron was oxidized by dissolved oxygen, but ferrihydrite and green rust were first formed and then transformed to magnetic iron oxides (mainly magnetite and maghemite) in the electrochemical oxidation from 0 to 0.9 V (vs. SCE), which facilitates the adsorption of As(V) and subsequent solid-liquid separation under a magnetic field. In simulated As(V)-containing solution with initial pH 7.0, zero-valent iron was electrochemically oxidized to magnetite and maghemite at 0.6 V (vs. SCE) for 2 h. The As(V) concentration first decreased from 5127.5 to 26.8 μg L-1 with a removal ratio of 99.5%. In actual mining wastewaters, zero-valent iron was electrochemically oxidized to maghemite at 0.6 V (vs. SCE) for 24 h, and the As(V) concentration decreased from 5486.4 to 3.6 μg L-1 with a removal ratio of 99.9%. The removal ratio of As(V) increased slightly with increasing potential, and increased first and then decreased with increasing initial pH. Compared with that of SO42- and NO3-, the presence of Cl- significantly enhanced the removal of As(V). This work provides a highly efficient, facile and low-cost technique for the treatment of arsenic-containing wastewaters.
Research Organization:
University of Connecticut, Storrs, CT (United States)
Sponsoring Organization:
Central Universities; China Postdoctoral Science Foundation; National Key Research and Development Program of China; National Natural Science Foundation of China; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
Grant/Contract Number:
FG02-86ER13622
OSTI ID:
1977296
Journal Information:
Journal of Environmental Management, Journal Name: Journal of Environmental Management Journal Issue: C Vol. 307; ISSN 0301-4797
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (61)

Removal of arsenic from drinking water by batch and continuous electrocoagulation processes using hybrid Al-Fe plate electrodes journal March 2013
Investigation of magnetite nanoparticles stability in air by thermal analysis and FTIR spectroscopy journal March 2016
Kinetic Model of Arsenic Sorption onto Zero-Valent Iron (ZVI) journal October 2010
Scrutiny of interference effect of ions and organic matters on water treatment using supported nanoscale zero-valent iron journal July 2018
Study of Hypochlorite Reduction Related to the Sodium Chlorate Process journal April 2016
Synthesis and characterization of maghemite nanopowders by chemical precipitation method journal April 2014
The effects of applied potential and chloride ion on the repassivation kinetics of pure iron journal July 1996
Synthesis and characterization of goethite and goethite–hematite composite: experimental study and literature survey journal March 2003
Arsenic speciation analysis journal August 2002
Electrocoagulation for magnetic seeding of colloidal particles journal February 2001
Review of arsenic geochemical characteristics and its significance on arsenic pollution studies in karst groundwater, Southwest China journal February 2017
Numerical simulation for reactive solute transport of arsenic in permeable reactive barrier column including zero-valent iron journal October 2011
Electrocoagulation treatment of arsenic in wastewaters: A comprehensive review journal June 2017
Oxidation of acetaminophen by Green rust coupled with Cu(II) via dioxygen activation: The role of various interlayer anions (CO32−, SO42−, Cl−) journal October 2018
Enhanced adsorption removal of arsenic from mining wastewater using birnessite under electrochemical redox reactions journal November 2019
Remediation of inorganic arsenic in groundwater for safe water supply: A critical assessment of technological solutions journal June 2013
Arsenic removal by electrocoagulation process: Recent trends and removal mechanism journal August 2017
Removal of phosphate from aqueous solution using nanoscale zerovalent iron (nZVI) journal September 2014
Arsenic toxicity, health hazards and removal techniques from water: an overview journal November 2007
Electrocoagulation process in water treatment: A review of electrocoagulation modeling approaches journal February 2017
Arsenic contamination, consequences and remediation techniques: A review journal February 2015
Study of lepidocrocite γ-FeOOH electrochemical reduction in neutral and slightly alkaline solutions at 25°C journal November 2005
Removal of arsenic from drinking water by the electrocoagulation using Fe and Al electrodes journal May 2011
Controls on the formation of Fe(II,III) (hydr)oxides by Fe(0) electrolysis journal October 2018
A review on decontamination of arsenic-contained water by electrocoagulation: Reactor configurations and operating cost along with removal mechanisms journal February 2020
Properties of γ-FeOOH, α-FeOOH and α-Fe2O3 particles precipitated by hydrolysis of Fe3+ ions in perchlorate containing aqueous solutions journal June 2006
The removal of arsenic from water using natural iron oxide minerals journal December 2013
Arsenic removal technologies and future trends: A mini review journal January 2021
Highly crystalline porous magnetite and vacancy-ordered maghemite microcrystals of rhombohedral habit journal October 2013
Evaluation of operating parameters with respect to charge loading on the removal efficiency of arsenic from potable water by electrocoagulation journal June 2016
Arsenic removal from groundwater by horizontal-flow continuous electrocoagulation (EC) as a standalone process journal February 2018
Simultaneous removal of arsenic and fluoride from synthetic solution through continuous electrocoagulation: Operating cost and sludge utilization journal February 2019
Arsenic and antimony in water and wastewater: Overview of removal techniques with special reference to latest advances in adsorption journal March 2015
Laboratory based approaches for arsenic remediation from contaminated water: Recent developments journal September 2006
As(V) adsorption on maghemite nanoparticles journal July 2009
The use of zero-valent iron for groundwater remediation and wastewater treatment: A review journal February 2014
Environmental implications and applications of engineered nanoscale magnetite and its hybrid nanocomposites: A review of recent literature journal January 2017
Arsenic removal from natural groundwater using ‘green rust’: Solid phase stability and contaminant fate journal January 2021
Magnetic iron oxide (Fe3O4) nanoparticles from tea waste for arsenic removal journal April 2014
A review on nanotechnological application of magnetic iron oxides for heavy metal removal journal October 2019
Optical properties of γ-Fe2O3 nanoparticles dispersed on sol–gel silica spheres journal September 2004
Iron oxide and its modified forms as an adsorbent for arsenic removal: A comprehensive recent advancement journal October 2017
Synthesis and characterization of an iron-impregnated biochar for aqueous arsenic removal journal January 2018
Studies on the electrochemical decontamination of wastewater containing arsenic journal June 2010
Treatment of potable water containing low concentration of arsenic with electrocoagulation: Different connection modes and Fe–Al electrodes journal March 2011
A new method for the identification and quantification of magnetite–maghemite mixture using conventional X-ray diffraction technique journal May 2012
Comparative study of arsenic removal by iron using electrocoagulation and chemical coagulation journal November 2010
Effects of water chemistry on arsenic removal from drinking water by electrocoagulation journal January 2011
Achieving arsenic concentrations of <1 μg/L by Fe(0) electrolysis: The exceptional performance of magnetite journal January 2020
Comparison of Arsenic(V) and Arsenic(III) Sorption onto Iron Oxide Minerals:  Implications for Arsenic Mobility journal September 2003
Competing Fe(II)-Induced Mineralization Pathways of Ferrihydrite journal September 2005
Production and Transformation of Mixed-Valent Nanoparticles Generated by Fe(0) Electrocoagulation journal February 2015
Ferrous and Ferric Ion Generation During Iron Electrocoagulation journal April 2009
Evidence for Different Surface Speciation of Arsenite and Arsenate on Green Rust: An EXAFS and XANES Study journal January 2010
Arsenite and Arsenate Adsorption on Ferrihydrite:  Kinetics, Equilibrium, and Adsorption Envelopes journal February 1998
Studies Relating to Removal of Arsenate by Electrochemical Coagulation: Optimization, Kinetics, Coagulant Characterization journal May 2010
Arsenic Removal from High-Arsenic Water Sources by Coagulation and Electrocoagulation journal January 2013
Arsenic Removal from Water by Adsorption Using Iron Oxide Minerals as Adsorbents: A Review journal September 2012
Electrochemical Generation of Green Rust using Electrocoagulation journal August 2007
Groundwater arsenic contamination in Bangladesh and West Bengal, India. journal May 2000
Sorption Kinetic of Arsenate as Water Contaminant on Zero Valent Iron journal January 2013

Similar Records

Rapid and Efficient Arsenic Removal by Iron Electrocoagulation Enabled with in Situ Generation of Hydrogen Peroxide
Journal Article · Mon Apr 20 20:00:00 EDT 2020 · Environmental Science and Technology · OSTI ID:1616139

Enhanced adsorption removal of arsenic from mining wastewater using birnessite under electrochemical redox reactions
Journal Article · Fri Jun 21 20:00:00 EDT 2019 · Chemical Engineering Journal · OSTI ID:1598202

Effect of Humic Acid on the Removal of Chromium(VI) and the Production of Solids in Iron Electrocoagulation
Journal Article · Sun May 21 20:00:00 EDT 2017 · Environmental Science and Technology · OSTI ID:1438854