Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 243, Issue -, Pages 136-145Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2016.08.019
Keywords
Layered hydroxide salts; Layered double hydroxide salts; Chromate removal; Magnetite; Topotactic anionic exchange reaction
Funding
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico) [303846/2014-3]
- CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior)
- FINEP (Financiadora de Estudos e Projetos)
- CAPES
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Layered zinc hydroxide nitrate (ZnHN) and Zn/Ni layered double hydroxide salts were synthesized and used to remove chromate ions from solutions at pH 8.0. The materials were characterized by many instrumental techniques before and after chromate ion removal. ZnHN decomposed after contact with the chromate solution, whereas the layered structure of Zn/Ni hydroxide nitrate (Zn/NiHN) and Zn/Ni hydroxide acetate (Zn/NiHA) remained their layers intact after the topotactic anionic exchange reaction, only changing the basal distances. ZnHN, Zn/NiHN, and Zn/NiHA removed 210.1, 144.8, and 170.1 mg of CrO42-/g of material, respectively. Although the removal values obtained for Zn/NiHN and Zn/NiHA were smaller than the values predicted for the ideal formulas of the solids (194.3 and 192.4 mg of CrO42-/g of material, respectively), the measured capacities were higher than the values achieved with many materials reported in the literature. Kinetic experiments showed the removal reaction was fast. To facilitate the solid/liquid separation process after chromium removal, Zn/Ni layered double hydroxide salts with magnetic supports were also synthesized, and their ability to remove chromate was evaluated. (C) 2016 Elsevier Inc. All rights reserved.
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