Physico-chemical characterization and valorization of swelling and non-swelling Moroccan clays in basic dye removal from aqueous solutions

Bentahar, Yassine; Draoui, Khalid; Hurel, Charlotte; Ajouyed, Omar; Khaïroun, S.; Marmier, Nicolas

doi:10.1016/j.jafrearsci.2019.03.017

Cited by 35 publications

(15 citation statements)

References 57 publications

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“…The major equilibrium time seen in the acid-activated samples were possibly due to the creation of new active sites in the clay [ 74 ]. The equilibrium times found in this work are in accordance with those found in the literature [ 39 , 79 , 80 ].…”

Section: Resultssupporting

confidence: 92%

“…The adsorption mechanism of the calcium bentonites, clays formed by the smectite clay mineral montmorillonite, occurs mainly due to ionic exchanges and electrostatic interactions in the surface of the clay mineral particles [39]. The permanent high negative charge in the clay surface is characteristic of the montmorillonite, which can facilitate adsorption by cationic dyes and impair that of anionic ones [40][41][42].…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Anionic Dye on the Acid-Functionalized Bentonite

et al. 2020

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The efficiency of acid treatment on natural calcium bentonite (natural bentonite) for anionic dye adsorption was investigated using methyl orange (MO) as a probe. Additionally, adsorption experiments were accomplished between the natural bentonite, acidified bentonite, and a cationic dye (methylene blue, MB). Acid functionalization in natural bentonite (RF) was carried out with HCl and H2SO4 acids (RF1 and RF2, respectively). The samples were characterized by chemical analysis, mineralogy, particle size, and thermal behavior with the associated mass losses. The adsorption efficiency of MO and MB dyes was investigated by the effects of the initial concentration of adsorbate (Ci) and the contact time (tc). The acid treatment was efficient for increasing the adsorption capacity of the anionic dye, and the Qmaxexp values measured were 2.2 mg/g, 67.4 mg/g e 47.8 mg/g to RF, RF1 e RF2, respectively. On the other hand, the acid functionalization of bentonite did not significantly modify the MB dye adsorption. The Sips equation was the best fit for the adsorption isotherms. Thus, we found that the acid-functionalized bentonite increases the anionic dye adsorption by up to 8000%. The increased adsorptive capacity of acidified bentonite was explained in terms of electrostatic attraction between the clay surface and the dye molecule.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Adsorption of Anionic Dye on the Acid-Functionalized Bentonite

et al. 2020

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“…According to Tchomgui-Kamga et al [40], the adsorption nature can be described using the separation factor and that it can be indicated to be either linear (R L � 1), irreversible (R L � 0), unfavorable (R L >1), or favorable (0 < R L < 1) [44]. e values from this current research support the conclusion that the adsorption favors the Langmuir isotherm model and is supported by other researchers [45,46]. e kinetics of the adsorption process which is critical to process efficiency was also investigated and the understanding of mechanism(s) was involved.…”

Section: Adsorption Isotherm and Kinetic Modelssupporting

confidence: 85%

Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water Treatment

Annan

Arkorful

Konadu

et al. 2021

Journal of Chemistry

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Dyes used by the textile, tannery, and food industries tend to pollute water bodies and must be removed to get clean water. Hydroxyapatite (HAP) was synthesized from eggshells using the wet precipitation process. The as-synthesized HAP was characterized using Fourier Transform Infrared (FTIR) and X-ray powder diffraction (XRD). The synthesized HAP was mixed with three different clays: halloysite (HNT), kaolinite (KAO), and bentonite (BENT). The removal efficiency values of methylene blue (MB) from the data showed that HAP-BENT adsorbents had higher values, followed by HAP-HNT and then HAP-KAO adsorbents. The combined masses of 24 mg, 34.5 mg, and 33 mg (representing 20%, 15%, and 10% of HAP-BENT mass) had average adsorption capacity values of 20.7 mg/g, 17.2 mg/g, and 17.9 mg/g, respectively. For each mass percentage, the adsorption capacity values were found to decrease with adsorbent dosage. The HAP-BENT composites had removal efficiency values of 98.4, 91.9%, and 91.9%, respectively. Adsorption data for the HAP-BENT adsorbents were found to be well described by the Langmuir isotherm model and pseudo-second-order kinetic model. The effect of temperature on adsorption capacity was evaluated and thermodynamical modeling was undertaken. The thermodynamical modeling predicts that based on the value of the change in enthalpy and Gibbs free energy the process was exothermic and spontaneous. This work confirms the potential of HAP-clay composites in removing MB from water.

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“…The tests were carried out at pH = 8.0; therefore, the surface of Clay 6 was negatively charged, improving the MB cation adsorption. Moreover, according to Table 1 , Clay 6 presents several oxides, such as MgO, K 2 O, CaO, TiO 2 , MnO, and others that could promote the cationic exchange capacity of the clay to improve its adsorption capacity [ 63 , 64 ]. Furthermore, Clay 6 contains Metahalloysite (M), which could also contribute to the high adsorption capacity of the clay since, according to the literature, metahalloysite has a potential application in the design and preparation of heterogeneous catalysts in procedures where the temperature did not exceed 450 °C [ 65 ].…”

Section: Discussionmentioning

confidence: 99%

Synthesis of the ZnTiO3/TiO2 Nanocomposite Supported in Ecuadorian Clays for the Adsorption and Photocatalytic Removal of Methylene Blue Dye

et al. 2020

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Currently, the study of semiconductor materials is very promising for the photocatalytic remediation of hazardous organic substances present in the air and water. Various semiconductors have been investigated in this interesting photo-assisted methodology, among them metal oxides such as ZnO, TiO2 and their derivatives. In this study, ZnTiO3/TiO2 was synthesized by the sol-gel method using Ti(OC3H7)4 and Zn(CH3COO)2 · 2H2O as reagents. The role of several conditions such as synthesis temperature and TiO2:ZnO proportion on the morphology and purity of compounds obtained was studied, and the suitable conditions for the synthesis of photocatalysts were determined. Various techniques were used to conduct a systematic investigation on the structural, morphological, and photocatalytic properties of ZnTiO3/TiO2. Scanning Electron Microscopy (SEM) images show that ZnTiO3/TiO2 have a typical particle size of approximately 100 nm with a quasi-spherical shape. The adsorption and photocatalytic activity were investigated by the decolorization of Methylene Blue (MB) as an organic contaminant under UV irradiation both in TiO2 and ZnTiO3/TiO2 supported over some Ecuadorian clays. The materials evaluated were prepared in the shape of 0.2 cm (diameter) and 1.0 cm (length) cylindrical extrudates. The degradation percentage of MB obtained was 85% approximately after 150 min of irradiation. The results obtained allow us to conclude that these synthesized materials can be used as adsorbents and photocatalysts.

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Physico-chemical characterization and valorization of swelling and non-swelling Moroccan clays in basic dye removal from aqueous solutions

Cited by 35 publications

References 57 publications

Adsorption of Anionic Dye on the Acid-Functionalized Bentonite

Adsorption of Anionic Dye on the Acid-Functionalized Bentonite

Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water Treatment

Synthesis of the ZnTiO3/TiO2 Nanocomposite Supported in Ecuadorian Clays for the Adsorption and Photocatalytic Removal of Methylene Blue Dye

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