Arsenic adsorption onto hematite and goethite

Abstract

Surface complexation reactions on mineral affect the fate and the transport of arsenic in environmental systems and the global cycle of this element. In this work, the sorption of As(V) on two commercial iron oxides (hematite and goethite) was studied as a function of different physico-chemical parameters such as pH and ionic strength. The main trend observed in the variation of the arsenic sorbed with the pH is a strong retention in acidic pH and the decrease of the sorption on both sorbents at alkaline pH values. The sorption experiments for these iron oxides show that there is no effect of the ionic strength on arsenate adsorption suggesting the formation of an inner sphere surface complex. At pH values corresponding to natural pH water, both hematite and goethite are able to adsorb more than 80% of arsenic, whatever the initial concentration may be. The iron oxides used in this work should be suitable candidates as sorbents for As(V) removal technologies.

Arsenic Adsorption onto Minerals: Connecting Experimental Observations with Density Functional Theory Calculations

“…Alumina has been found to effectively remove iAs V [55], but it is necessary to use activated alumina to efficiently remove iAs III from solution [56]. A multitude of studies on As adsorbents have been conducted using Fe-based mineral sorbents [57,58], such as magnetite [54,[59][60][61][62][63], ferrihydrite [53,54,[64][65][66], goethite [48,54,66,67], and zero-valent iron [62].…”

Liberation of Adsorbed and Co-Precipitated Arsenic from Jarosite, Schwertmannite, Ferrihydrite, and Goethite in Seawater

“…They have been widely used in the extraction of heavy metals from natural [6] and industrial sources [7], which has generated a great number of studies about mechanisms of surface interactions [8][9][10][11][12]. These minerals are common in environments with high availability of metal sulphides exposed to oxidizing conditions, as in acid sulphate soils, in the oxidation zone of mine tailings, or ore deposits [13,14].…”

Adsorption of arsenic(V) from aqueous solutions by goethite/silica nanocomposite

“…It is widely distributed worldwide and found in abundance in numerous locations around the world (Encyclopedia Britannica 2014). Goethite has been studied as an absorbent for arsenic removal (Chakravarty et al 2002;Giménez et al 2007;Lakshmipathiraj et al 2006;Mamindy-Pajany et al 2009). Chakravarty et al (2002) reported it as ''major mineral phase'' in their ''low cost ferruginous manganese ore'' which achieved nearly 100 % As removal.…”