Chitosan/montmorillonite composites for fast removal of methylene blue from aqueous solutions

El-Kousy, Salah M.; El-Shorbagy, Hadeel G.; El‐Ghaffar, M. A. Abd

doi:10.1016/j.matchemphys.2020.123236

Cited by 69 publications

(24 citation statements)

References 43 publications

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“…This value is in agreement with the values reported by Haounati et al., Garcia‐Padilla et al., and El‐Kousy et al. [ 53–55 ] On the other hand, the XRD pattern of MagMt displayed new diffraction peaks at 2θ = 35.6°, 53.6°, 57.3°, and 63.0°, which are characteristic peaks of Fe 3 O 4 . [ 56 ] These findings supported the intercalation of Fe 3 O 4 into interlayers [ 57 ] and the magnetization of montmorillonite.…”

Section: Resultssupporting

confidence: 92%

Adsorption of Diazo Dye from Aqueous Solutions by Magnetic Montmorillonite Composite

Akar

Ozdemir

Sayin

et al. 2020

CLEAN Soil Air Water

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Synthetic dyes have complex molecular structures and are stable molecules against oxidizing agents, sunlight, and microbial attack. Therefore, the treatment of dye‐containing wastewater using appropriate techniques is of great importance. Difficulties in separation and recovery of an adsorbent from the solution limit the large‐scale applications of the adsorption process. A magnetic separation technique can be adapted to the adsorption process to overcome these limitations. In this study, a natural mineral‐based magnetic adsorbent is prepared by a co‐precipitation method. Adsorption performance of magnetic montmorillonite (MagMt) is evaluated in both batch and continuous systems as a function of initial pH, contact time, adsorbent dosage, ionic strength, flow rate, and bed depth. MagMt is characterized through infrared (IR) spectroscopy, scanning electron microscopy (SEM), energy dispersive X‐ray analysis (EDX), vibrating sample magnetometer (VSM), X‐ray diffraction (XRD), and zeta potential measurement. Sorption yield of MagMt for Bismark Brown‐Y (BB‐Y) is found as maximum (98.60%) at pH 4 with 40 mg adsorbent. Fast sorption equilibrium is attained within 10 min and the sorption data follow the pseudo‐second‐order kinetic model and Langmuir isotherm model. The maximum monolayer sorption capacity of MagMt is 138.70 mg g‒1.

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Section: Resultssupporting

confidence: 92%

Adsorption of Diazo Dye from Aqueous Solutions by Magnetic Montmorillonite Composite

Akar

Ozdemir

Sayin

et al. 2020

CLEAN Soil Air Water

View full text Add to dashboard Cite

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“…The extruded DE showed a pH PZC value of around 4.4 and the adsorption tests were carried out at pH = 7.0; therefore, the surface of these materials was negatively charged, improving adsorption of the cationic dye. In addition, according to XRF, DE contained various cations, such as Mg, K, Ca, and Fe, that could promote the cation exchange capacity of the extruded composites prepared to improve their MB adsorption capacity [ 102 ]. Likewise, there are several parameters that determine the effectiveness of the adsorption process.…”

Section: Discussionmentioning

confidence: 99%

La-Doped ZnTiO3/TiO2 Nanocomposite Supported on Ecuadorian Diatomaceous Earth as a Highly Efficient Photocatalyst Driven by Solar Light

2021

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Currently, there is great interest in the use of TiO2 for photocatalytic remediation of wastewater. Doping, heterojunction, and immobilization on porous materials are effective methods to improve the photocatalytic efficiency of this semiconductor oxide. In this study, ZnTiO3/TiO2 (ZTO) and ZnTiO3/TiO2/La (ZTO/La) nanocomposites were successfully prepared and immobilized on diatomaceous earth (DE). The composition and texture of the composites prepared were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM-EDX), and specific surface area (SSA). The adsorption capacity and photocatalytic activity of the composites were determined via degradation of methylene blue (MB) in batch reactors. The materials evaluated were prepared in the shape of 0.2 cm (diameter) and 1.0 cm (length) cylindrical extrudates. The results indicate that the ZTO/La-DE composite exhibited higher efficiency for the removal of MB under solar irradiation than both ZTO-DE and DE. The pseudo-second-order model and the Langmuir isotherm model were better suited to explain the adsorption process. The highest degradation percentage of MB obtained was 96% after 150 min of irradiation. The results indicate that synthesized composite could be used for the removal of cationic dyes in wastewater.

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“…The extruded clays showed a pH PZC value around 4, and the adsorption tests were carried out at pH = 7.0, so the surface of these materials was negatively charged, improving the adsorption of cationic dye. Also, according to Table 1 and Table 2 , clays and zeolites contained various cations, such as Mg, K, Ca, Na, and Fe, that could promote the cation exchange capacity of prepared extruded composites to improve their MB adsorption capacity [ 83 ]. In addition to that, G-Clay contains metahalloysite (M), a mineralogical phase with applications in the design and preparation of materials with adsorbent properties [ 84 ].…”

Section: Discussionmentioning

confidence: 99%

Structuring of ZnTiO3/TiO2 Adsorbents for the Removal of Methylene Blue, Using Zeolite Precursor Clays as Natural Additives

et al. 2021

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Adsorption is an effective method of removing harmful pollutants from air and water. In the present study, zeolites prepared by sol-gel method from two Ecuadorian clays were combined with precursor clays and the ZnTiO3/TiO2 semiconductor for adsorbing methylene blue (MB) as a water contaminant. The synthesized compounds were characterized using powder X-ray diffraction, X-ray fluorescence, scanning electron microscopy, energy dispersive X-ray, and surface area measurement. These compounds were combined to form cylindrical extrudates of 0.2 cm (diameter) and 1.0 cm (length). The adsorption characteristics of the composites were measured using batch sorption studies as a function of pH, initial concentration, and contact time. The pseudo-second-order model and the Langmuir isotherm model were better suited to the adsorption process. The equilibrium state was achieved around 180 min of adsorption, and a pH of 7 was established as the optimal operating condition. The maximum adsorption values of the dye were obtained with the composites derived from G-Clay, whose average adsorption capacity was 46.36 mg g−1, in contrast with composites derived from R-Clay, whose average adsorption value was 36.24 mg g−1. The results reflect that synthesized composites could be used potentially for the removal of cationic dye from wastewater.

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Chitosan/montmorillonite composites for fast removal of methylene blue from aqueous solutions

Cited by 69 publications

References 43 publications

Adsorption of Diazo Dye from Aqueous Solutions by Magnetic Montmorillonite Composite

Adsorption of Diazo Dye from Aqueous Solutions by Magnetic Montmorillonite Composite

La-Doped ZnTiO3/TiO2 Nanocomposite Supported on Ecuadorian Diatomaceous Earth as a Highly Efficient Photocatalyst Driven by Solar Light

Structuring of ZnTiO3/TiO2 Adsorbents for the Removal of Methylene Blue, Using Zeolite Precursor Clays as Natural Additives

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