{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,3]],"date-time":"2026-04-03T03:54:50Z","timestamp":1775188490102,"version":"3.50.1"},"reference-count":26,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2011,4,28]],"date-time":"2011-04-28T00:00:00Z","timestamp":1303948800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>This research evaluated the importance of the adsorption properties of chitosan a chitosan\/zeolite conjugate film for the removal of Cr(VI) ions from solutions in the 5\u2013260 mg\/L concentration range, when the pH was adjusted to 4.0 and 6.0. The uptake capacities of the films formed by chitosan and by the chitosan\/zeolite conjugate were calculated by mass balance. The equilibrium isotherms were fitted to the Langmuir, Freundlich and Redlich-Peterson models. The chitosan film seems to be a good sorbent for Cr(VI) at pH 4, but its physical instability suggests the need for a more resilient support. Due to this fact zeolite was added to the chitosan matrix in solution and a chitosan\/zeolite (CS\/Zeo) film was thus formed. The solubility of the film and the characterization of the different matrices by FTIR, TGA and X-Ray showed that a cross-linked structure was formed between the chitosan and zeolite and the solubility of the film increased. In this study, the low manufacturing cost of the CS\/Zeo matrix, the good uptake of Cr(VI) at acidic pH (17.28 mg\/g) and the non desorption of Cr(VI) from the film in water suggests this combination should be tested in industrial environment.<\/jats:p>","DOI":"10.3390\/molecules16053569","type":"journal-article","created":{"date-parts":[[2011,4,28]],"date-time":"2011-04-28T10:20:20Z","timestamp":1303986020000},"page":"3569-3579","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":57,"title":["Chromium (VI) Ion Adsorption Features of Chitosan Film and Its Chitosan\/Zeolite Conjugate 13X Film"],"prefix":"10.3390","volume":"16","author":[{"given":"Anabelle C. L.","family":"Batista","sequence":"first","affiliation":[{"name":"Rede Nordeste de Biotecnologia (RENORBIO), Universidade Estadual do Cear\u00e1, Av. Paranjana, 1.700, Campus do Itaperi, 60740-000 Fortaleza, CE, Brazil"},{"name":"N\u00facleo de Pesquisas em Ci\u00eancias Ambientais (NPCIAMB), Universidade Cat\u00f3lica de Pernambuco, Boa Vista 50 050-590 Recife, PE, Brazil"}]},{"given":"Em\u00edlio R.","family":"Villanueva","sequence":"additional","affiliation":[{"name":"Departamento de Engenharia Qu\u00edmica, Universidade de Vigo, Spain"}]},{"given":"Rosa Val\u00e9ria S.","family":"Amorim","sequence":"additional","affiliation":[{"name":"Departamento de Histologia e Morfologia, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, Cidade Universit\u00e1ria, 50670-901, Recife, PE, Brazil"}]},{"given":"Maria Teresa","family":"Tavares","sequence":"additional","affiliation":[{"name":"Instituto de Biotecnologia e Bioengenharia (IBB), Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal"}]},{"given":"Galba M.","family":"Campos-Takaki","sequence":"additional","affiliation":[{"name":"N\u00facleo de Pesquisas em Ci\u00eancias Ambientais (NPCIAMB), Universidade Cat\u00f3lica de Pernambuco, Boa Vista 50 050-590 Recife, PE, Brazil"}]}],"member":"1968","published-online":{"date-parts":[[2011,4,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"418","DOI":"10.1295\/polymj.34.418","article-title":"Preparation of chitosan-graft-poly(vinyl acetate) copolymers and their adsorption of copper ion","volume":"34","author":"Don","year":"2002","journal-title":"Polym. 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