Preparation of hybrids of wood sawdust with 3-aminopropyl-triethoxysilane. Application as an adsorbent to remove reactive blue 4 dye from wastewater effluents

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Teixeira, R.A., Lima, E.C., Benetti, A.D., Thue, P.S., Cunha, M.R., Cimirro, N.F.G.M., Sher, F. ORCID: 0000-0003-2890-5912, Dehghani, M.H., dos Reis, G.S. and Dotto, G.L., 2021. Preparation of hybrids of wood sawdust with 3-aminopropyl-triethoxysilane. Application as an adsorbent to remove reactive blue 4 dye from wastewater effluents. Journal of the Taiwan Institute of Chemical Engineers, 125, pp. 141-152. ISSN 1876-1070

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Official URL: https://doi.org/10.1016/j.jtice.2021.06.007

Abstract

Background: Biomass-based materials present low sorption capacity. In order to overcome this disadvantage, chemical modification of these materials is required.

Methods: Hybrids of biomass-based materials were obtained by reacting (25%-200% weight) 3-aminopropyl-triethoxysilane (APTES) with the biomass Ayous wood sawdust (AW), obtaining the hybrid materials AW@APTES-0.25, AW@APTES-0.50, AW@APTES-1.0, AW@APTES-1.5, and AW@APTES-2.0, that were characterized by hydrophobic/hydrophilic balance, CHN elemental analysis, surface area, TGA, FTIR, and pHpzc.

Significant findings: For screening purposes, the five materials were tested as adsorbents to remove reactive blue 4 (RB-4) from water. The results showed that AW@APTES-0.5 attained the maximum removal of RB-4. The kinetics and equilibrium data were suitably fitted by the nonlinear General-order kinetic (GO) and Liu equilibrium adsorption models. The maximum amount adsorbed of RB-4 dye was 415.1 mg g − 1 using AW@APTES-0.5 (50 °C). An increase in the Qmax value of AW@APTES-0.5 concerning unmodified AW attained up to 21.6 times. The ΔG° and ΔH° indicated that the adsorption processes of RB-4 onto adsorbents are endothermic and spontaneous, and the magnitude of enthalpy of adsorption (25.10 kJ mol−1) is compatible with the electrostatic attraction mechanism. The adsorbents’ applicability for treating simulated dye effluents showed an excellent efficiency attaining 98.66% removal of the effluent.

Item Type:

Journal article

Publication Title:

Journal of the Taiwan Institute of Chemical Engineers

Creators:

Teixeira, R.A., Lima, E.C., Benetti, A.D., Thue, P.S., Cunha, M.R., Cimirro, N.F.G.M., Sher, F., Dehghani, M.H., dos Reis, G.S. and Dotto, G.L.

Publisher:

Taiwan Institute of Chemical Engineers

Date:

2021

Volume:

125