Physical-chemical Characterization of Nano-Zinc Oxide/Activated Carbon Composite for Phenol Removal from Aqueous Solution

*Allwar Allwar scopus  -  Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Islam Indonesia, Indonesia
Asih Setyani  -  Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Islam Indonesia, Indonesia
Ulul Sugesti  -  Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Islam Indonesia, Indonesia
Khusna Afifah Fauzani  -  Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Islam Indonesia, Indonesia
Received: 4 Feb 2021; Revised: 23 Mar 2021; Accepted: 23 Mar 2021; Published: 31 Mar 2021; Available online: 25 Mar 2021.
Open Access Copyright (c) 2021 by Authors, Published by BCREC Group
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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Abstract

Oil palm shell was used as a precursor for preparation of activated carbon using different chemical activations (potassium hydroxide (KOH), zinc chloride (ZNCl2), and phosphoric acid (H3PO4)). Each activated carbons (AC) was mixed with nano-zinc oxide to form a composite. From the gas sorption analyzer, it is showed that nitrogen adsorption isotherms show Type II for ZnO/AC-KOH and ZnO/AC-ZnCl2 corresponding to the micro- and mesoporous structures, respectively. However, the nitrogen adsorption isotherm of ZnO/AC-H3PO4 exhibits the Type I with predominantly microporous structures. The SEM micrographs produced unsmooth surface and different pore sizes. The XRD patterns at 2θ of 25.06° and 26.75° were come from amorphous activated carbon. The peak intensity of ZnO was weak due to low concentration of zinc precursor. However, the ZnO of ZnO/AC-ZnCl2 showed strongly peak intensity. The effectiveness of the composites was examined for phenol removal determined by UV-Vis Spectrophotometer method. The equilibrium adsorption follows the Langmuir and Freundlich models according to the best correlation coefficient (R2). The kinetic model was only obtained for the pseudo-second-order with the best linearity of the correlation coefficient (R2). The results of this study showed that the oil palm shell has a great potential for ZnO/AC with excellent adsorptive property. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

 

Keywords: Oil palm shell; Activated carbon; Zinc oxide; Phenol; Langmuir and Freundlich
Funding: Universitas Islam Indonesia

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