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Nickel (II) ions are very toxic and provoke many diseases. The purpose of this work was to study the possibility of removing toxic nickel (II) ions from polluted water using an iron (III) chloride (FeCl3) coagulant. It is shown that the removal of nickel ions from aqueous solution by iron (III) hydroxide precipitate formed during the coagulation process at pH\u00a07 and 8 is described with satisfactory accuracy by the classical adsorption isotherms of Freundlich, Langmuir, and Dubinin\u2010Radushkevich. The studies performed with the use of X\u2010ray powder diffraction and thermal analyses, IR, Raman, and M\u00f6ssbauer spectroscopy have shown that the uptake of nickel ions by iron (III) hydroxide precipitate is due to simple physical adsorption and is not accompanied by the formation of mixed iron and nickel compounds. No alloying of the formed iron (III) hydroxide precipitate with nickel ions takes place either. The formed iron (III) hydroxide precipitate is a two\u2010line ferrihydrite having the gross formula Fe<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub>\u2009\u00d7\u20093H<jats:sub>2<\/jats:sub>O. Its sorption capacity for nickel ions is almost an order of magnitude higher than that of some mineral and carbon sorbents, and at pH\u00a07 and 8, it is 60.5 and 141.9\u00a0mg\/g, respectively.<\/jats:p><\/jats:sec><jats:sec><jats:title>Practitioner Points<\/jats:title><jats:p><jats:list list-type=\"bullet\">\n<jats:list-item><jats:p>Coagulant FeCl<jats:sub>3<\/jats:sub> cleans contaminated solutions from Ni(II) ions.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>Iron (III) hydroxide precipitated at pH 7 and 8 is a two\u2010line ferrihydrite Fe<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub>\u00a0\u00d7\u20093H<jats:sub>2<\/jats:sub>O.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>Removing of Ni(II) ions is described by classical adsorption isotherms.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>The most complete removal of Ni(II) ions occurs at pH\u2009=\u20098.<\/jats:p><\/jats:list-item>\n<\/jats:list><\/jats:p><\/jats:sec>","DOI":"10.1002\/wer.10827","type":"journal-article","created":{"date-parts":[[2022,12,2]],"date-time":"2022-12-02T08:02:08Z","timestamp":1669968128000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Coagulation removal of nickel (II) ions by ferric chloride: Efficiency and mechanism"],"prefix":"10.1002","volume":"94","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3919-3930","authenticated-orcid":false,"given":"\u041eleg D.","family":"Linnikov","sequence":"first","affiliation":[{"name":"Institute of Solid State Chemistry Ural Branch of the Russian Academy of Sciences  Ekaterinburg Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2071-4863","authenticated-orcid":false,"given":"Irina V.","family":"Rodina","sequence":"additional","affiliation":[{"name":"Institute of Solid State Chemistry Ural Branch of the Russian Academy of Sciences  Ekaterinburg Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3654-3993","authenticated-orcid":false,"given":"Galina S.","family":"Zakharova","sequence":"additional","affiliation":[{"name":"Institute of Solid State Chemistry Ural Branch of the Russian Academy of Sciences  Ekaterinburg Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5726-4427","authenticated-orcid":false,"given":"Konstantin N.","family":"Mikhalev","sequence":"additional","affiliation":[{"name":"M.N. Mikheev Institute of Metal Physics Ural Branch of the Russian Academy of Sciences  Ekaterinburg Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5643-7004","authenticated-orcid":false,"given":"Inna V.","family":"Baklanova","sequence":"additional","affiliation":[{"name":"Institute of Solid State Chemistry Ural Branch of the Russian Academy of Sciences  Ekaterinburg Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1253-8727","authenticated-orcid":false,"given":"Yulia V.","family":"Kuznetsova","sequence":"additional","affiliation":[{"name":"Institute of Solid State Chemistry Ural Branch of the Russian Academy of Sciences  Ekaterinburg Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6091-1250","authenticated-orcid":false,"given":"Alexander Yu.","family":"Germov","sequence":"additional","affiliation":[{"name":"M.N. 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