Cationic and anionic dyes removal by low-cost hybrid alginate/natural bentonite composite beads: Adsorption and reusability studies

Oussalah, Asma; Boukerroui, Abdelhamid; Aichour, Amina; Djellouli, Brahim

doi:10.1016/j.ijbiomac.2018.11.197

Cited by 131 publications

(45 citation statements)

References 33 publications

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“…4 and the corresponding parameters are reported in Table 4. As observed, the BZJS1 had a specific area of 15.685 m 2 /g, a pore volume of 0.032 cm 3 /g and a pore diameter of 4.11 nm, showing its low porosity; this can be due to the effect of alginate that hinders or damages the creation of porosity [34].…”

Section: Characterization Of the Materialssupporting

confidence: 51%

The use of encapsulation as a proposed solution to avoid problems encountered with conventional materials in powder form: Application in methylene blue removal from aqueous solutions

Guediri

Bouguettoucha

Chebli

et al. 2020

Journal of Molecular Liquids

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The Ziziphus jujuba stones chemically modified with orthophosphoric acid (PZJS), then encapsulated with sodium alginate (BZJS1 and BZJS2) were used for organic dye adsorption.In this context, the basic dye methylene blue (MB) was chosen as a test molecule. The characteristics of the prepared beads were examined by different characterization techniques, such as Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray diffraction (EDX), X-ray fluorescence (XRF), Thermogravimetr ic analysis (TGA) and Brunauer-Emmett-Teller method (BET) with nitrogen adsorptiondesorption isotherm at 77°K. In a batch system, initial pH (2-12), temperature (10, 25, 30 and A c c e p t e d m a n u s c r i p t 2 40 °C), initial concentration (50-200 mg/L), contact time, salt and organic compound effects were studied. The obtained results showed that the maximum MB adsorption amounts were 737.13 mg/g and 660.12 mg/g onto BZJS1 and BZJS2 at ambient temperature respectively, showing that the prepared materials are more efficient than most of the other adsorbents.Moreover, experimental data modeling showed that the adsorption process followed the Redlich-Peterson model. Regarding kinetics modeling, pseudo-first-order (PFO), pseudosecond-order and Pseudo-nth order models were used to correlate experimental data, demonstrating that a mass transfer equation (PFO) could describe MB adsorption. Thermodynamic Parameters were also evaluated, demonstrating that the MB adsorption process was achievable, spontaneous and exothermic. The regeneration study showed that both of the beads had excellent adsorption efficiency even at the sixth cycle for the two beads, 92.01 and 82.88 for BZJS1 and BZJS2, respectively. From this and in view of a future implementation at industrial scale, encapsulation by sodium alginate polymer can be therefore promisingly proposed as a solution to avoid the problems of conventional materials in powder form, such as the difficulty of regeneration, performances and mass loss during the recovery step of the powder from the medium.

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Section: Characterization Of the Materialssupporting

confidence: 51%

The use of encapsulation as a proposed solution to avoid problems encountered with conventional materials in powder form: Application in methylene blue removal from aqueous solutions

Guediri

Bouguettoucha

Chebli

et al. 2020

Journal of Molecular Liquids

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“…As a well-known natural polymer-based hydrogel, alginate hydrogel with the advantages of ionic functional groups is commonly utilized to capture ionic dyes [ 13 ]. Moreover, alginate hydrogels have been utilized in cationic dye adsorption due to their abundance, being eco-friendly, and low-cost alginate [ 14 ]. Alginate is a polysaccharide composed of β-D-Mannuronic Acid (M) and α-L-Guluronic Acid (G) units that possess negatively charged carboxylate groups.…”

Section: Introductionmentioning

confidence: 99%

Highly Effective Covalently Crosslinked Composite Alginate Cryogels for Cationic Dye Removal

Sezen

Thakur

Ozmen

2021

Gels

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Currently, macroporous hydrogels have been receiving attention in wastewater treatment due to their unique structures. As a natural polymer, alginate is used to remove cationic dyes due to its sustainable features such as abundance, low cost, processability, and being environmentally friendly. Herein, alginate/montmorillonite composite macroporous hydrogels (cryogels) with high porosity, mechanical elasticity, and high adsorption yield for methylene blue (MB) were generated by the one-step cryogelation technique. These cryogels were synthesized by adding montmorillonite into gel precursor, followed by chemical cross-linking employing carbodiimide chemistry in a frozen state. The as-prepared adsorbents were analyzed by FT-IR, SEM, gel fraction, swelling, uniaxial compression, and MB adsorption tests. The results indicated that alginate/montmorillonite cryogels exhibited high gelation yield (up to 80%), colossal water uptake capacity, elasticity, and effective dye adsorption capacity (93.7%). Maximum adsorption capacity against MB was 559.94 mg g−1 by linear regression of Langmuir model onto experimental data. The Pseudo-Second-Order model was fitted better onto kinetic data compared to the Pseudo-First-Order model. Improved porosity and mechanical elasticity yielding enhanced dye removal capacity make them highly potential alternative adsorbents compared to available alginate/montmorillonite materials for MB removal.

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“…Recently, many investigators have been carried out on the effective removal of MB, MG, and MV from synthetic wastewater using adsorbents such as chitin/ clay microspheres (Xu et al 2018), calcium alginate/ acid-activated organobentonite composite beads (Djebri et al 2016), natural clay of Agadir region (Bentahar et al 2018), chitosan/cellulose beads (Vega-Negron et al 2018), graphene oxide intercalated montmorillonite nanocomposites (Puri and Sumana 2018), zeolite nanostructures (Abdelrahman 2018), sodium alginate-based organic/inorganic superabsorbent composite (Thakur et al 2016), alginate/natural bentonite composite beads (Oussalah et al 2019), and magnetic calcium alginate beads (Asadi et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Alginate-coated perlite beads for the efficient removal of methylene blue, malachite green, and methyl violet from aqueous solutions: kinetic, thermodynamic, and equilibrium studies

Parlayıcı

2019

J Anal Sci Technol

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Environmental pollution has been increasing recently due to industrialization. Many industries use dyestuffs to color their products. This work investigates the adsorption of methylene blue (MB), malachite green (MG), and methyl violet (MV) on alginate-coated perlite beads (AP). AP was prepared by a sol-gel process. The removal of MB, MG, and MV from aqueous solutions by AP as an adsorbent was tested by using a batch-type model. In order to prove the effectiveness of the study, it has been tried to obtain optimum efficiency at optimum level by working depending on mixing time (minutes), initial dye concentration (ppm), adsorbent dose (mg/L), pH, and temperature (°C). The results showed that the MB, MG, and MV adsorption process reached equilibrium within a 60-min period for AP. It has been found that the amount of adsorbed dyestuff increases with the initial dye concentration, the pH of the solution. Thermodynamic activation parameters were calculated from experimental data at different temperatures. The AP was characterized by Fourier Transform Infrared Spectroscopy (FT-IR) before and after MB, MG, and MV adsorption. The equilibrium adsorption data were described by Langmuir, Freundlich, Scatchard, Temkin and D-R isotherms. The modified Langmuir isotherm was applied to explain the experimental adsorption, and the greatest MB, MG, and MV adsorption capacity of the AP reached to 104.1, 74.6, and 149.2 mg/g, respectively. The pseudo-first and pseudo-second-order equations were used to evaluate the kinetic data, and the constants are determined. The best correlation coefficients were well described using the pseudo-second-order kinetic model. As a result, AP has claimed the possibility as an adsorbent for MB, MG, and MV removal from dilute aqueous solutions.

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Cationic and anionic dyes removal by low-cost hybrid alginate/natural bentonite composite beads: Adsorption and reusability studies

Cited by 131 publications

References 33 publications

The use of encapsulation as a proposed solution to avoid problems encountered with conventional materials in powder form: Application in methylene blue removal from aqueous solutions

The use of encapsulation as a proposed solution to avoid problems encountered with conventional materials in powder form: Application in methylene blue removal from aqueous solutions

Highly Effective Covalently Crosslinked Composite Alginate Cryogels for Cationic Dye Removal

Alginate-coated perlite beads for the efficient removal of methylene blue, malachite green, and methyl violet from aqueous solutions: kinetic, thermodynamic, and equilibrium studies

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