{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T23:16:43Z","timestamp":1772147803563,"version":"3.50.1"},"reference-count":0,"publisher":"American Scientific Publishers","issue":"3","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["j nanosci nanotechnol"],"published-print":{"date-parts":[[2021,3,1]]},"abstract":"<jats:p>If not properly treated, water contaminated with chromium (Cr(VI)) and lead (Pb(II)) can cause severe damage to health due to the accumulation of those toxic metals in the human body. Therefore, in this work, three iron oxides, i.e., \u03b4-FeOOH, cystine-functionalized \u03b4-FeOOH\n (Cys-\u03b4-FeOOH), and Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub>, were synthesized and used as adsorbents for Cr(VI) and Pb(II) in water. The results indicated that the Cr(VI) is best adsorbed on cys-\u03b4-FeOOH followed by \u03b4-FeOOH and Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub>. It was because of the enhanced\n interaction between Cr(VI) and the cysteine functional groups on the \u03b4-FeOOH surface. The Cr(VI) adsorption capacity of cys-\u03b4-FeOOH, \u03b4-FeOOH, and Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub> was 217, 14, and 8 mg g<jats:sup>\u22121<\/jats:sup>, respectively. On the other hand, Pb(II) was preferentially\n adsorbed directly on \u03b4-FeOOH achieving a maximum Pb(II) adsorption capacity of 174 mg g<jats:sup>\u22121<\/jats:sup>. The Pb(II) adsorption capacity of cys-\u03b4-FeOOH and Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub> was 97 and 74 mg g<jats:sup>\u22121<\/jats:sup>, respectively. The Cr(VI) adsorption on cys-\u03b4-FeOOH\n was best described by the Langmuir-Freundlich model, whereas Pb(II) adsorption on \u03b4-FeOOH followed the Langmuir model. Both Cr(VI) and Pb(II) adsorption on the adsorbents was well-fitted to pseudo-second-order kinetics. The Cr(VI) was more quickly adsorbed by cys-\u03b4-FeOOH (<jats:italic>h<\/jats:italic><jats:sub>0<\/jats:sub>\n = 0.10 mg g<jats:sup>\u22121<\/jats:sup> min<jats:sup>\u22121<\/jats:sup>) while the initial adsorption rate of Pb(II) onto \u03b4-FeOOH was significantly faster (<jats:italic>h<\/jats:italic><jats:sub>0<\/jats:sub> = 16.34 mg g<jats:sup>\u22121<\/jats:sup> min<jats:sup>\u22121<\/jats:sup>). Finally, the synthesized adsorbents were efficient to remove Cr(VI)\n and Pb(II) from water samples of the Doce river after the environmental disaster of Mariana city, Brazil, thus showing its applicability to remediate real water samples.<\/jats:p>","DOI":"10.1166\/jnn.2021.19089","type":"journal-article","created":{"date-parts":[[2021,1,6]],"date-time":"2021-01-06T13:54:34Z","timestamp":1609941274000},"page":"1711-1720","source":"Crossref","is-referenced-by-count":3,"title":["Iron Oxide Nanomaterials for the Removal of Cr(VI) and Pb(II) from Contaminated River After Mariana Mining Disaster"],"prefix":"10.1166","volume":"21","author":[{"given":"Thain\u00e1 Gusm\u00e3o","family":"Andrade","sequence":"first","affiliation":[{"name":"Instituto de Ci\u00eancia, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39803-371 Te\u00f3filo Otoni, Minas Gerais, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mayra Soares","family":"Santos","sequence":"additional","affiliation":[{"name":"Instituto de Ci\u00eancia, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39803-371 Te\u00f3filo Otoni, Minas Gerais, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Luiz Fernando Oliveira","family":"Maia","sequence":"additional","affiliation":[{"name":"Instituto de Ci\u00eancia, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39803-371 Te\u00f3filo Otoni, Minas Gerais, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tamise Emanuele Oliveira de","family":"Aquino","sequence":"additional","affiliation":[{"name":"Instituto de Ci\u00eancia, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39803-371 Te\u00f3filo Otoni, Minas Gerais, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lucas Zeferino da","family":"Silva","sequence":"additional","affiliation":[{"name":"Instituto de Ci\u00eancia, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39803-371 Te\u00f3filo Otoni, Minas Gerais, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vitor Chaves","family":"Silva","sequence":"additional","affiliation":[{"name":"Instituto de Ci\u00eancia, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39803-371 Te\u00f3filo Otoni, Minas Gerais, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M\u00e1rcia Cristina da Silva","family":"Faria","sequence":"additional","affiliation":[{"name":"Instituto de Ci\u00eancia, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39803-371 Te\u00f3filo Otoni, Minas Gerais, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bruno Lemos","family":"Batista","sequence":"additional","affiliation":[{"name":"Centro de Ci\u00eancias Naturais e Humanas, Universidade Federal do ABC, 09210-580 Santo Andr\u00e9, S\u00e3o Paulo, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tatiana","family":"Pedron","sequence":"additional","affiliation":[{"name":"Centro de Ci\u00eancias Naturais e Humanas, Universidade Federal do ABC, 09210-580 Santo Andr\u00e9, S\u00e3o Paulo, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Luiz Carlos Alves de","family":"Oliveira","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica-ICEx, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, Minas Gerais, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M\u00e1rcio C\u00e9sar","family":"Pereira","sequence":"additional","affiliation":[{"name":"Instituto de Ci\u00eancia, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39803-371 Te\u00f3filo Otoni, Minas Gerais, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jairo Lisboa","family":"Rodrigues","sequence":"additional","affiliation":[{"name":"Instituto de Ci\u00eancia, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39803-371 Te\u00f3filo Otoni, Minas Gerais, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"17","container-title":["Journal of Nanoscience and 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