PMID: 18200851Jan 19, 2008Paper

Coprecipitation of arsenate with metal oxides. 2. Nature, mineralogy, and reactivity of iron(III) precipitates

Environmental Science & Technology
Antonio ViolanteDipanjan Banerjee

Abstract

Coprecipitation of arsenic with iron or aluminum occurs in natural environments and is a remediation technology used to remove this toxic metalloid from drinking water and hydrometallurgical solutions. In this work, we studied the nature, mineralogy, and reactivity toward phosphate of iron-arsenate coprecipitates formed at As(V)/Fe(III) molar ratios (R) of 0, 0.01, or 0.1 and at pH 4.0, 7.0, and 10.0 aged for 30 or 210 days at 50 degrees C and studied the desorption of arsenate. At R = 0, goethite and hematite (with ferrihydrite at pH 4.0 and 7.0) crystallized, whereas at R = 0.01, the formation of ferrihydrite increased and hematite crystallization was favored over goethite. In some samples, the morphology of hematite changed from rounded platy crystals to ellipsoids. At R = 0.1, ferrihydrite formed in all the coprecipitates and remained unchanged even after 210 days of aging. The surface area and chemical composition of the precipitates were affected by pH, R, and aging. Chemical dissolution of the samples showed that arsenate was present mainly in ferrihydrite, but at R = 0.01, it was partially incorporated into the structures of crystalline Fe oxides. The sorption of phosphate on to the coprecipitates was affected not only ...Continue Reading

Citations

Jan 8, 2014·Journal of Hazardous Materials·Nanthi BolanKirk Scheckel
May 15, 2008·Geochemical Transactions·James D KubickiDonald L Sparks
Nov 9, 2011·Journal of Hazardous Materials·Wei LiWei-Guo Song
Mar 23, 2011·Journal of Hazardous Materials·Jun ZhuAntonio Violante
Aug 11, 2010·Water Research·Fernando L Pantuzzo, Virginia S T Ciminelli
Mar 11, 2015·Environmental Geochemistry and Health·Eun Jung KimKitae Baek
Jul 1, 2015·Chemosphere·Erico T F FreitasVirginia S T Ciminelli
Aug 3, 2016·Environmental Science & Technology·Joshua S WeatherillSamuel Shaw
Jan 29, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Zhenzi LiKang Li
Apr 9, 2009·Environmental Science & Technology·Antonio ViolanteDipanjan Banerjee
Dec 18, 2009·Environmental Science & Technology·Chiharu TokoroShuji Owada
Aug 14, 2009·Environmental Science & Technology·Benjamin D Kocar, Scott Fendorf
Jul 30, 2010·Environmental Science & Technology·Frances N SkomurskiB Pete McGrail
Jun 2, 2018·Environmental Science & Technology·Qiantao ShiXiaoguang Meng
Aug 6, 2013·Environmental Science & Technology·Ralph M BolanzJuraj Majzlan
Nov 12, 2020·Environmental Science & Technology·Case M van Genuchten, Arslan Ahmad
Dec 3, 2013·Environmental Science & Technology·Yandi HuYoung-Shin Jun
May 3, 2013·ACS Applied Materials & Interfaces·Ramakrishna Mallampati, Suresh Valiyaveettil

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