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Research article - Peer-reviewed, 2021

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

Teixeira, Roberta A.; Lima, Eder C.; Benetti, Antonio D.; Thue, Pascal S.; Cunha, Mariene R.; Cimirro, Nilton F. G. M.; Sher, Farooq; Dehghani, Mohammad Hadi; dos Reis, Glaydson S.; Dotto, Guilherme L.


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 pH(pzc).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 degrees C). An increase in the Q(max) value of AW@APTES-0.5 concerning unmodified AW attained up to 21.6 times. The Delta G degrees and Delta H degrees 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. (C) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.


Textile effluents; Biomass-based hybrid materials; Thermodynamics adsorption; Adsorption mechanism; Nonlinear fitting

Published in

Journal of the Taiwan Institute of Chemical Engineers
2021, volume: 125, pages: 141-152
Publisher: ELSEVIER

Authors' information

Teixeira, Roberta A.
Federal University of Rio Grande do Sul (UFRGS)
Lima, Eder Claudio
Federal University of Rio Grande do Sul (UFRGS)
Benetti, Antonio D.
Federal University of Rio Grande do Sul (UFRGS)
Thue, Pascal S.
Federal University of Rio Grande do Sul (UFRGS)
Cunha, Mariene R.
Federal University of Rio Grande do Sul (UFRGS)
Cimirro, Nilton F.G.M.
Federal University of Rio Grande do Sul (UFRGS)
Sher, Farooq
Nottingham Trent University
Dehghani, Mohammad Hadi
Tehran University of Medical Sciences
Dotto, Guilherme L.
Federal University of Santa Maria (UFSM)

Sustainable Development Goals

SDG6 Clean water and sanitation

UKÄ Subject classification

Water Treatment

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