Microwave-assisted activated carbon from cocoa shell as adsorbent for removal of sodium diclofenac and nimesulide from aqueous effluents.

Autor: Saucier C; Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, P.O. Box 15003, 91501-970 Porto Alegre, RS, Brazil., Adebayo MA; Department of Chemical Sciences, Ajayi Crowther University, Oyo, Oyo State, Nigeria., Lima EC; Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, P.O. Box 15003, 91501-970 Porto Alegre, RS, Brazil. Electronic address: eder.lima@ufrgs.br., Cataluña R; Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, P.O. Box 15003, 91501-970 Porto Alegre, RS, Brazil., Thue PS; Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, P.O. Box 15003, 91501-970 Porto Alegre, RS, Brazil; Department of Applied Chemistry, University of Ngaoundere, P.O. Box 455, Ngaoundere, Cameroon., Prola LDT; Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, P.O. Box 15003, 91501-970 Porto Alegre, RS, Brazil., Puchana-Rosero MJ; Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, P.O. Box 15003, 91501-970 Porto Alegre, RS, Brazil., Machado FM; Technology Development Center, Federal University of Pelotas (UFPEL), Pelotas, Brazil., Pavan FA; Institute of Chemistry, Federal University of Pampa (UNIPAMPA), Bagé, RS, Brazil., Dotto GL; Chemical Engineering Department, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil.
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2015 May 30; Vol. 289, pp. 18-27. Date of Electronic Publication: 2015 Feb 11.
DOI: 10.1016/j.jhazmat.2015.02.026
Abstrakt: Microwave-induced chemical activation process was used to prepare an activated carbon from cocoa shell for efficient removal of two anti-inflammatories, sodium diclofenac (DFC) and nimesulide (NM), from aqueous solutions. A paste was obtained from a mixture of cocoa shell and inorganic components; with a ratio of inorganic: organic of 1 (CSC-1.0). The mixture was pyrolyzed in a microwave oven in less than 10 min. The CSC-1.0 was acidified with a 6 mol L(-1) HCl under reflux to produce MWCS-1.0. The CSC-1.0 and MWCS-1.0 were characterized using FTIR, SEM, N2 adsorption/desorption curves, X-ray diffraction, and point of zero charge (pHpzc). Experimental variables such as initial pH of the adsorbate solutions and contact time were optimized for adsorptive characteristics of MWCS-1.0. The optimum pH for removal of anti-inflammatories ranged between 7.0 and 8.0. The kinetic of adsorption was investigated using general order, pseudo first-order and pseu do-second order kinetic models. The maximum amounts of DCF and NM adsorbed onto MWCS-1.0 at 25 °C are 63.47 and 74.81 mg g(-1), respectively. The adsorbent was tested on two simulated hospital effluents. MWCS-1.0 is capable of efficient removal of DCF and NM from a medium that contains high sugar and salt concentrations.
(Copyright © 2015 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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