| Autor: |
Wamba AGN; Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, P.O. Box 15003, Porto Alegre, RS, 91501-970, Brazil.; Department of Process Engineering, University of Ngaoundere, Ngaoundere, Cameroon.; Department of Process Engineering, Saint Jerome Catholic University Institute, Av. Akwa Koumassi, Douala, Cameroon., Lima EC; Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, P.O. Box 15003, Porto Alegre, RS, 91501-970, Brazil. profederlima@gmail.com., Ndi SK; Department of Process Engineering, University of Ngaoundere, Ngaoundere, Cameroon., Thue PS; Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, P.O. Box 15003, Porto Alegre, RS, 91501-970, Brazil., Kayem JG; Department of Process Engineering, University of Ngaoundere, Ngaoundere, Cameroon., Rodembusch FS; Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, P.O. Box 15003, Porto Alegre, RS, 91501-970, Brazil., Dos Reis GS; Department of Metallurgy, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves, Porto Alegre, RS, 9500, Brazil., de Alencar WS; Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, P.O. Box 15003, Porto Alegre, RS, 91501-970, Brazil.; Institute of Exact Sciences, Federal University of South and Southeast of Pará (UNIFESSPA), Marabá, PA, Brazil. |
| Abstrakt: |
Natural pozzolan is an amorphous silicate-based material of volcanic origin. In this work, the natural pozzolan was modified by using 3-aminopropyltriethoxysilane (APTES) as a grafting agent. This material was characterized by pH pzc , N 2 adsorption/desorption curves, FTIR, TGA/DTG, DRUV, SEM, and elementary analysis. The functionalized materials were used for the removal of Reactive Black 5 (RB-5) and Brilliant Green 1 (BG-1) dyes from aqueous solutions using batch-contact adsorption. The characterization of modified pozzolan by FTIR, TGA/DTG, BET, and DRUV-vis revealed the effectiveness of grafting of amine functional group on pozzolan structure. The kinetic adsorption data were better fitted with general order for both dyes while for equilibrium models were better fitted by the Liu isotherm model. The maximum sorption capacities Q max (at 50 °C) obtained with the modified pozzolan were 350.6 and 300.9 mg g -1 for BG-1 and RB-5, at pH 9.0 and 2.0, respectively. The thermodynamic parameters show that the removal of dyes was spontaneous and endothermic. The modified material was also tested for the treatment of simulated dye house effluents showing very high efficiency. |
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