Chromium VI adsorption on cerium oxide nanoparticles and morphology changes during the process

JOURNAL OF HAZARDOUS MATERIALS

卷:184

Article

Recillas, Sonia¹  Colon, Joan¹  Casals, Eudald²  Gonzalez, Edgar²  Puntes, Victor^2,3  Sanchez, Antoni¹  Font, Xavier¹ 

[1] Autonomous Univ Barcelona, Sch Engn, Dept Chem Engn, Bellaterra 08193, Spain

[2] Autonomous Univ Barcelona, Catalan Inst Nanotechnol, Bellaterra 08193, Spain

[3] Passeig Lluis Co, Catalan Inst Res & Adv Studies, Barcelona 08010, Spain

关键词: CeO2 nanoparticles;    Adsorption;    Desorption;    Kinetics;    Chromium VI;    Toxicity;   

DOI  :  10.1016/j.jhazmat.2010.08.052

来源: Elsevier

【 摘 要 】

In this study, suspended cerium oxide nanoparticles stabilized with hexamethylenetetramine were used for the removal of dissolved chromium VI in pure water. Several concentrations of adsorbent and adsorbate were tested, trying to cover a large range of possible real conditions. Results showed that the Freundlich isotherm represented well the adsorption equilibrium reached between nanoparticles and chromium, whereas adsorption kinetics could be modeled by a pseudo-second-order expression. The separation of chromium-cerium nanoparticles from the medium and the desorption of chromium using sodium hydroxide without cerium losses was obtained. Nanoparticles agglomeration and morphological changes during the adsorption-desorption process were observed by TEM. Another remarkable result obtained in this study is the low toxicity in the water treated by nanoparticles measured by the Microtox (R) commercial method. These results can be used to propose this treatment sequence for a clean and simple removal of drinking water or wastewater re-use when a high toxicity heavy metal such as chromium VI is the responsible for water pollution. (C) 2010 Elsevier B.V. All rights reserved.

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