Congo red recovery from water using green extraction solvents

Villar, Lorena; Sas, Olalla G.; Sánchez, Pablo; Santiago, Ángeles Domínguez; González, Begoña

doi:10.1016/j.wri.2021.100170

Cited by 14 publications

(6 citation statements)

References 43 publications

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“…These dual impacts may explain the intense research activity on the treatment of colored effluents. The processes for dye removal may involve precipitation and flotation [1][2][3], and solvent extraction [4][5][6]. Catalytic and photocatalytic degradation have been also widely documented [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Methylene blue removal from aqueous solutions using a biochar/gellan gum hydrogel composite: Effect of agitation mode on sorption kinetics

Elgarahy

Mostafa

Zaki

et al. 2023

International Journal of Biological Macromolecules

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Section: Introductionmentioning

confidence: 99%

Methylene blue removal from aqueous solutions using a biochar/gellan gum hydrogel composite: Effect of agitation mode on sorption kinetics

Elgarahy

Mostafa

Zaki

et al. 2023

International Journal of Biological Macromolecules

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“…In a bid to sequester water contaminants from the aquatic ecosystem, different types of physicochemical/biological methods have been employed. Some of these treatment techniques include electrochemical techniques 6 , biological treatments 7 , extraction 8 , ion exchange 9 , filtration 10 , photodegradation 11 – 14 , chemical precipitation 15 , membrane bioreactor 16 and reverse osmosis 17 . On the other hand, the application of these methods for pollutant removal is limited and this is due to the possible generation of a toxic secondary pollutant, elevated operational cost and inefficiency at low pollutant concentration 18 , 19 .…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics, kinetics and isothermal studies of tartrazine adsorption onto microcline/MWCNTs nanocomposite and the regeneration potentials

Amaku

Taziwa

2023

Sci Rep

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The quest for a cheap, effective, and eco-friendly wastewater treatment technique that is free of secondary toxic byproducts, calls for the fabrication of a nature-friendly adsorbent with a robust capacity to decontaminate polluted water sources and be recycled. To this end, we report the fabrication of novel nanocomposite (KMCM) from microcline (KMC) and multiwall carbon nanotubes (MWCNTs). The adsorbents (KMC and KMCM) were characterized using XRD, BET, SEM, TGA and FTIR. The novel and low-cost nano sorbent were designed for the elimination of tartrazine (Tatz) from wastewater. The adsorption of Tatz onto KMC and KMCM was influenced by adsorbent dose, initial Tatz concentration, contact time and solution pH. Experimental data acquired from the equilibrium studies were well addressed by the Langmuir isotherm model. The maximum uptake capacity of 37.96 mg g−1 and 67.17 mg g−1 were estimated for KMC and KMCM. The kinetics for the adsorption of Tatz onto KMC and KMCM was best expressed by pseudo-second-order and Elovich models. The thermodynamic parameters revealed that the uptake of Tatz onto KMC and KMCM was an endothermic (ΔH: KMC = 35.0 kJ mol−1 and KMCM = 42.91 kJ mol−1), entropy-driven (ΔS: KMC = 177.6 J K−1 mol−1 and KMCM = 214.2 J K−1 mol−1) and spontaneous process. Meanwhile, KMCM demonstrated good reusability potential and superior adsorption efficiency when compared to other adsorbents.

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“…DESs offer an attractive cost-effective alternative as the substitutes of ionic liquids and organic solvents, since they are simple to synthesize and the majority of them are characterized by their non-toxicity and biodegradability. To date, they have been scarcely used for dye removal [10], and only a few studies have combined DES with polymers to obtain eco-friendly adsorbents [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Accessible Eco-Friendly Method for Wastewater Removal of the Azo Dye Reactive Black 5 by Reusable Protonated Chitosan-Deep Eutectic Solvent Beads

Martínez-Rico,

Blanco,

Domínguez

et al. 2024

Molecules

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A novel approach to enhance the utilization of low-cost and sustainable chitosan for wastewater remediation is presented in this investigation. The study centers around the modification of chitosan beads using a deep eutectic solvent composed of choline chloride and urea at a molar ratio of 1:2, followed by treatment with sulfuric acid using an impregnation accessible methodology. The effectiveness of the modified chitosan beads as an adsorbent was evaluated by studying the removal of the azo dye Reactive Black 5 (RB5) from aqueous solutions. Remarkably, the modified chitosan beads demonstrated a substantial increase in adsorption efficiency, achieving excellent removal of RB5 within the concentration range of 25–250 mg/L, ultimately leading to complete elimination. Several key parameters influencing the adsorption process were investigated, including initial RB5 concentration, adsorbent dosage, contact time, temperature, and pH. Quantitative analysis revealed that the pseudo-second-order kinetic model provided the best fit for the experimental data at lower dye concentrations, while the intraparticle diffusion model showed superior performance at higher RB5 concentration ranges (150–250 mg/L). The experimental data were successfully explained by the Langmuir isotherm model, and the maximum adsorption capacities were found to be 116.78 mg/g at 298 K and 379.90 mg/g at 318 K. Desorption studies demonstrated that approximately 41.7% of the dye could be successfully desorbed in a single cycle. Moreover, the regenerated adsorbent exhibited highly efficient RB5 removal (80.0–87.6%) for at least five consecutive uses. The outstanding adsorption properties of the modified chitosan beads can be attributed to the increased porosity, surface area, and swelling behavior resulting from the acidic treatment in combination with the DES modification. These findings establish the modified chitosan beads as a stable, versatile, and reusable eco-friendly adsorbent with high potential for industrial implementation.

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Congo red recovery from water using green extraction solvents

Cited by 14 publications

References 43 publications

Methylene blue removal from aqueous solutions using a biochar/gellan gum hydrogel composite: Effect of agitation mode on sorption kinetics

Methylene blue removal from aqueous solutions using a biochar/gellan gum hydrogel composite: Effect of agitation mode on sorption kinetics

Thermodynamics, kinetics and isothermal studies of tartrazine adsorption onto microcline/MWCNTs nanocomposite and the regeneration potentials

Accessible Eco-Friendly Method for Wastewater Removal of the Azo Dye Reactive Black 5 by Reusable Protonated Chitosan-Deep Eutectic Solvent Beads

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