Preparation, Characterization, and Application of Metakaolin-Based Geopolymer for Removal of Methylene Blue from Aqueous Solution

Alouani, Marouane El; Alehyen, Saliha; Achouri, Mohammed El; Taïbi, M.

doi:10.1155/2019/4212901

Cited by 80 publications

(51 citation statements)

References 73 publications

(61 reference statements)

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“…is rapid saturation of clay for higher concentration was mainly due to the abundance and early availability of active sites of the clay surface. Similar results were mentioned in the previous study [46]. e presence of carbonates, organic matter, and associated minerals in the nontreated clays created a clutter on the adsorbent surface making it more difficult to access the MG cations at reactive sites, which prolonged the equilibrium time for AB.…”

Section: Effect Of Contact Time Initial Dye Concentration Andsupporting

confidence: 87%

Removal Properties, Mechanisms, and Performance of Methyl Green from Aqueous Solution Using Raw and Purified Sejnane Clay Type

Satlaoui

Trifi

Romdhane

et al. 2019

Journal of Chemistry

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Adsorption of cationic methyl green (MG) on nontreated (AB) and purified (AP) natural Sejnane clay type was studied in an equilibrium batch process. This work reported the application of kaolinite-rich heterogeneous clay for the removal of a cationic dye. Effects of contact time, initial dye concentration, mass adsorbent, pH, and temperature on the MG removal were checked. The adsorbent before and after adsorption processes was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR), and atomic adsorption spectrophotometer. Equilibrium data were mathematically modeled using the Freundlich, Langmuir, and intraparticle diffusion models. Kinetic of adsorption was determined by pseudo-first-order and pseudo-second-order models. The free energy (ΔG°), standard enthalpy (ΔH°), and standard entropy (ΔS°) were calculated. A fast increase in the equilibrium removal of the cationic dye was obtained at a pH ranging between 3 and 11 and moderate temperature. This rapid MG adsorption proved the efficiency of kaolinite clay in cationic dye removal. Decolorizing yields were 73.3% for AB and 99.8% for AP. Thus, the adsorption capacity of purified clay was clearly higher than of H2SO4 and thermic activated clays. The data more closely resembled a pseudo-second-order model process, and the clay had reasonable Freundlich adsorption capacity. Adsorption process was endothermic and spontaneous chemisorption. SEM analysis showed that the adsorbed MG had remarkably changed the morphology of raw and purified clay surface. The low desorption rates confirmed effectiveness of this type of material for the retention of methyl green molecules. Thus, tested clays have no environmental impact.

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Section: Effect Of Contact Time Initial Dye Concentration Andsupporting

confidence: 87%

Removal Properties, Mechanisms, and Performance of Methyl Green from Aqueous Solution Using Raw and Purified Sejnane Clay Type

Satlaoui

Trifi

Romdhane

et al. 2019

Journal of Chemistry

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“…In this work, the pseudo-first-order, pseudo-second-order kinetic, and intraparticle diffusion models [18] were investigated to study the nature of the adsorption of the methylene blue molecules using the perlite-based geopolymer. Table 2 displays the equations and mathematical parameters of kinetic models.…”

Section: Discussionmentioning

confidence: 99%

“…e perlite powder was added and mixed with a prepared solution with 2.5 ratio at ambient temperature for 15 min. e paste was introduced into a cylindrical mold and heated at 60°C for 24 h [18]. e obtained specimen was dried at room temperature for 3 days.…”

Section: Synthesis Methodmentioning

confidence: 99%

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Photocatalytic Degradation of Methylene Blue from Aqueous Medium onto Perlite-Based Geopolymer

Saufi

Alouani

Alehyen

et al. 2020

International Journal of Chemical Engineering

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In this work, geopolymer synthesized with perlite and an alkaline activator medium was evaluated as a new adsorbent and photocatalyst for degradation of methylene blue (MB) dye from an aqueous medium. The functional group, the structure, and the morphology of the raw and the synthesized materials were characterized using FT-IR, XRD, and SEM analysis. The degradation of MB in the contaminated solution was examined using the spectrophotometric technique. Several analysis methods revealed the formation of the aluminosilicate gel after the geopolymerization reaction. The kinetics data with UV and without UV irradiations were well fitted with the pseudo-second-order equation. The results indicated that the degradation efficiency of cationic dye by perlite-based geopolymer without and with UV was up to 88.94% and 97.87% in 4 hours, respectively. The degradation efficiencies of methylene blue are in the following order: perlite-based geopolymer under UV irradiations is greater than perlite-based geopolymer without UV irradiations that is larger than UV irradiations. The overall experimental results suggested that the new elaborated material with synergetic adsorption and photocatalytic activities has a great potential for the treatment of water contaminated by hazardous substances.

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“…Furthermore, the highly similar baselines of the calcined and dry received soils indicate similar amorphous contents. However, the collected XRD pattern indicated a greater amount of kaolinite (diffraction peaks at~11.6,~19.8, 23.7 and~25.4 2θ • [50][51][52]) and, correspondingly, a lower metakaolin (~8.9, 23.6 and 31.4 2θ • [53,54]) content in the dry received soil, which emphasises the importance of an adequate calcination temperature. In this instance, the lower temperature used in the pyrolysis plant (~550-650 • C compared to 750 • C in the lab furnace) resulted in greater residual kaolinite content and only partial calcination of the kaolinite [34].…”

Section: Compositional Differencesmentioning

confidence: 93%

Suitability of Remediated PFAS-Affected Soil in Cement Pastes and Mortars

et al. 2020

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Australia and many other parts of the world face issues of contamination in groundwater and soils by per- and poly-fluoroalkyl substances (PFAS). While the pyrolytic treatment of contaminated soils can destroy PFAS, the resulting heat-treated soils currently have limited applications. The purpose of this study was to demonstrate the usefulness of remediated soils in concrete applications. Using heat-treated soil as a fine aggregate, with a composition and particle size distribution similar to that of traditional concrete sands, proved to be a straightforward process. In such situations, complete fine aggregate replacement could be achieved with minimal loss of compressive strength. At high fine aggregate replacement (≥ 60%), a wetting agent was required for maintaining adequate workability. When using the heat-treated soil as a supplementary cementitious material, the initial mineralogy, the temperature of the heat-treatment and the post-treatment storage (i.e., keeping the soil dry) were found to be key factors. For cement mortars where minimal strength loss is desired, up to 15% of cement can be replaced, but up to 45% replacement can be achieved if moderate strengths are acceptable. This study successfully demonstrates that commercially heat-treated remediated soils can serve as supplementary cementitious materials or to replace fine aggregates in concrete applications.

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Preparation, Characterization, and Application of Metakaolin-Based Geopolymer for Removal of Methylene Blue from Aqueous Solution

Cited by 80 publications

References 73 publications

Removal Properties, Mechanisms, and Performance of Methyl Green from Aqueous Solution Using Raw and Purified Sejnane Clay Type

Removal Properties, Mechanisms, and Performance of Methyl Green from Aqueous Solution Using Raw and Purified Sejnane Clay Type

Photocatalytic Degradation of Methylene Blue from Aqueous Medium onto Perlite-Based Geopolymer

Suitability of Remediated PFAS-Affected Soil in Cement Pastes and Mortars

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