ZnO tetrapods and activated carbon based hybrid composite: Adsorbents for enhanced decontamination of hexavalent chromium from aqueous solution

Sharma, Mahima, Joshi, Monika, Nigam, Subhasha, Shree, Sindu, Avasthi, Devesh Kumar, Adelung, Rainer, Srivastava, Sanjeev Kumar and Kumar Mishra, Yogendra (2019) ZnO tetrapods and activated carbon based hybrid composite: Adsorbents for enhanced decontamination of hexavalent chromium from aqueous solution Chemical Engineering Journal, 358 . pp. 540-551. DOI 10.1016/j.cej.2018.10.031.

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Abstract

Owing to its acute toxicity and mobility, the hexavalent chromium [Cr(VI)] in water and wastewater is an immense risk to the environment. Herein, ZnO-tetrapods/activated carbon (ZnO-T/AC) nanocomposite was synthesized as an adsorbent for an efficient decontamination of Cr(VI) from an aqueous medium. The tetrapodal ZnO was synthesized by flame transport synthesis (FTS) approach. The utilized activated carbon (AC) was successfully prepared from sugarcane bagasse with sodium hydroxide (NaOH) impregnation, followed by carbonization. Finally the ZnO-T/AC nanocomposite was synthesized by the hydrothermal method. The structural and chemical properties of the obtained nanocomposite (NC) were systematically characterized using X-ray diffraction (XRD) technique, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy and Brunauer–Emmett–Teller (BET) analysis. Batch experiments were performed with the AC, ZnO-T and ZnO-T/AC to study their maximum adsorption efficiency for the Cr(VI). The effect of operational parameters such as contact time, pH and adsorbent dosage on the removal of Cr(VI) were also investigated. Different kinetic models were employed to comprehend the adsorption mechanism. The removal efficiency (97%) of Cr(VI) using ZnO-T/AC adsorbent was achieved at pH 2. The synthesized nanocomposite showed significant potential for the decontamination of Cr(VI) and can be further explored at a large scale for the efficient removal of hazardous heavy metal ions from the industrial contaminates.

Document Type: Article
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
DOI etc.: 10.1016/j.cej.2018.10.031
ISSN: 13858947
Projects: Future Ocean
Date Deposited: 16 Jan 2019 09:45
Last Modified: 16 Jan 2019 09:45
URI: http://eprints.uni-kiel.de/id/eprint/45370

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