{"title":"Arsenic removal and fixation by iron (oxyhydr)oxides: What is new?","authors":"Taiane G.F. Souza , Virginia S.T. Ciminelli","doi":"10.1016/j.coesh.2023.100466","DOIUrl":null,"url":null,"abstract":"<div><p>The affinity of arsenic (As) with iron (oxyhydr)oxides is known, at least, since 1835, when Robert Bunsen used iron hydroxides to revert As poisonings [<span>1</span>]. Since then, technologies utilizing iron oxides and (oxyhydr)oxides for As removal and fixation are applied worldwide. After so long and so much work: what is new? This work discusses the recent findings on how iron oxides and (oxyhydr)oxides properties, such as crystal facet and surface structure, impact As removal. The stability of residues has a pivotal role concerning the risks of As remobilization. Superficial vacancies increase As–Fe bonding strength. Finally, incorporation into oxyhydroxide structure by vacancy filling or interparticle attachment by oriented aggregation growth through aging promotes long-term As fixation.</p></div>","PeriodicalId":52296,"journal":{"name":"Current Opinion in Environmental Science and Health","volume":null,"pages":null},"PeriodicalIF":6.7000,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Current Opinion in Environmental Science and Health","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2468584423000260","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
The affinity of arsenic (As) with iron (oxyhydr)oxides is known, at least, since 1835, when Robert Bunsen used iron hydroxides to revert As poisonings [1]. Since then, technologies utilizing iron oxides and (oxyhydr)oxides for As removal and fixation are applied worldwide. After so long and so much work: what is new? This work discusses the recent findings on how iron oxides and (oxyhydr)oxides properties, such as crystal facet and surface structure, impact As removal. The stability of residues has a pivotal role concerning the risks of As remobilization. Superficial vacancies increase As–Fe bonding strength. Finally, incorporation into oxyhydroxide structure by vacancy filling or interparticle attachment by oriented aggregation growth through aging promotes long-term As fixation.
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