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Aouan B, Alehyen S, Fadil M, El Alouani M, Saufi H, El Herradi EH, El Makhoukhi F, Taibi M. Development and optimization of geopolymer adsorbent for water treatment: Application of mixture design approach. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 338:117853. [PMID: 37015145 DOI: 10.1016/j.jenvman.2023.117853] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 03/19/2023] [Accepted: 03/29/2023] [Indexed: 06/19/2023]
Abstract
The current paper refers to the study of a new approach to optimizing the adsorptive properties of geopolymers by varying the aluminosilicate precursors from kaolin (K), metakaolin (MK), and coal fly ash (CFA) as internal synthesis factors. The simplex-augmented-centroid mixture design was applied to identify the optimal formulation from the three aluminosilicate precursors to develop a geopolymer (GP) with a distinctive structure that positively affects its dye adsorption efficiency. The variously formulated GP samples were tested for the removal of both methylene blue (MB-dye) and crystal violet dye (CV-dye) from an aqueous solution. The mathematical-statistical analysis of the experimental readings suggested that the generated special cubic models were significant, and thus the chosen approach was adequate for determining the optimum blending proportion. The optimization tools indicated that the optimal mixture from the three aluminosilicate precursors for developing a GP with high adsorption efficiency was 58% MK, 42% K, and 0% CFA. The optimized geopolymer (GPO) was synthesized and then analyzed using a variety of physicochemical techniques, which revealed the presence of an amorphous N-A-S-H gel-rich porous structure as an influencing property on the geopolymer's organic dye adsorption efficiency. The dependence of the adsorption mechanism of both MB-dye and CV-dye by GPO on the adsorbent dosage, contact time, initial dye concentration, temperature, and solution pH was evaluated. The isothermic and kinetic experimental readings for MB and CV-dyes adsorption by GPO were well fitted to the pseudo-second-order and Freundlich models, with an exothermic, favorable, and spontaneous adsorption reaction thermodynamically. The experimental studies in the lab scale on GPO produce comparable results. From these results, it has been concluded that the accuracy and feasibility of the mixture design simulation succeeded in optimizing and developing a geopolymeric sorbent material with great potential as an excellent economical agent for removing cationic dyes from aqueous media. This point represents an added value compared to traditional non-optimized geopolymer absorbents. Besides, this geopolymer material represents a significant application possibility for water treatment and remediation of hazardous dye pollutants.
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Affiliation(s)
- Badr Aouan
- Mohammed V University in Rabat, Centre des Sciences des Matériaux, Laboratoire de Physico-Chimie des Matériaux Inorganiques et Organiques (LPCMIO), Ecole Normale Supérieure (E.N.S), Rabat, Morocco.
| | - Saliha Alehyen
- Mohammed V University in Rabat, Centre des Sciences des Matériaux, Laboratoire de Physico-Chimie des Matériaux Inorganiques et Organiques (LPCMIO), Ecole Normale Supérieure (E.N.S), Rabat, Morocco
| | - Mouhcine Fadil
- Mohammed V University in Rabat, Centre des Sciences des Matériaux, Laboratoire de Physico-Chimie des Matériaux Inorganiques et Organiques (LPCMIO), Ecole Normale Supérieure (E.N.S), Rabat, Morocco
| | - Marouane El Alouani
- Mohammed V University in Rabat, Centre des Sciences des Matériaux, Laboratoire de Physico-Chimie des Matériaux Inorganiques et Organiques (LPCMIO), Ecole Normale Supérieure (E.N.S), Rabat, Morocco
| | - Hamid Saufi
- Mohammed V University in Rabat, Centre des Sciences des Matériaux, Laboratoire de Physico-Chimie des Matériaux Inorganiques et Organiques (LPCMIO), Ecole Normale Supérieure (E.N.S), Rabat, Morocco
| | - El Hassania El Herradi
- Mohammed V University in Rabat, Centre des Sciences des Matériaux, Laboratoire de Physico-Chimie des Matériaux Inorganiques et Organiques (LPCMIO), Ecole Normale Supérieure (E.N.S), Rabat, Morocco
| | - Fadoua El Makhoukhi
- Centre National pour La Recherche Scientifique et Technique (CNRST-UATRS), Rabat, Morocco
| | - M'hamed Taibi
- Mohammed V University in Rabat, Centre des Sciences des Matériaux, Laboratoire de Physico-Chimie des Matériaux Inorganiques et Organiques (LPCMIO), Ecole Normale Supérieure (E.N.S), Rabat, Morocco
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Madima N, Kefeni KK, Mishra SB, Mishra AK, Kuvarega AT. Fabrication of magnetic recoverable Fe3O4/TiO2 heterostructure for photocatalytic degradation of rhodamine B dye. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.109966] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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