Study of variables for optimization of the dye indosol adsorption process using red mud and clay as adsorbents

Oliveira, Eveline Haiana Costa de; Mendonça, Erica T. R.; Baraúna, Osmar S.; Ferreira, J. M.; Sobrinho, Maurı́cio Alves da Motta

doi:10.1007/s10450-015-9742-0

Cited by 8 publications

(1 citation statement)

References 24 publications

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“…Its disposal is problematic, requiring large land areas and overloading the alumina's production cost [3]. During the years, many investigations have been performed aiming for a low cost and environmental friendly treatment and utilization of BR in numerous uses [4][5][6], such as an agent in building and constructing materials [7][8][9][10], an agent in the ceramic and glass industry [11][12][13], as an adsorbent for pollutant removal from water and wastewater or in pigments [14][15][16][17][18][19], as a coagulant for waste and water treatment [20][21][22], an absorbent of waste acidic gases [23][24][25], an agent for neutralizing acidic waste and raw materials of low cost for the recovery of valuable elements [26][27][28][29][30][31][32][33][34][35][36][37][38], in catalysts [39,40], and as an agent for soil remediation [41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Optimizing Conditions for Scandium Extraction from Bauxite Residue Using Taguchi Methodology

et al. 2019

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Bauxite residue is the voluminous by-product of alumina production after Bayer process. Its high alkalinity causes disposal problems and harmful environmental impacts. However, the residue contains significant amounts of valuable elements, such as rare earth elements, including scandium. Greek bauxite residue contains a high amount of scandium close to its main resources. Taking into account scandium’s limited availability coupled with its high demand in modern technology, bauxite residue could be considered as a potential resource for scandium recovery. In this study, the optimization of scandium extraction from bauxite residue with sulfuric acid is investigated using Taguchi methodology. Based on previous studies, acid molarity, leaching time, solid/liquid ratio, and reaction temperature were selected as control parameters for the selective Sc recovery. Method optimization targeted the highest concentration of scandium combined with the lowest concentration of iron without taking into account application constraints. Maximization of scandium concentration can be achieved only by reduced selectivity. The predicted values resulted from the Taguchi methodology were affirmed by a confirmation experiment conducted at optimal conditions. Regression analysis provided the respective equations to be applied on several conditions, depending on different applications.

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Section: Introductionmentioning

confidence: 99%

Optimizing Conditions for Scandium Extraction from Bauxite Residue Using Taguchi Methodology

et al. 2019

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Nanostructured Carbon-Based Materials for Adsorption of Organic Contaminants from Water

Bezerra

Teixeira

Silva-Filho

et al. 2019

Nanostructured Materials for Treating Aquatic Pollution

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Synthesis of Na-Alginate templated Montmorillonite-Silica Composite as adsorbent for removal of Rhodamine B

Deveci

2024

Adsorption

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In this study, mesoporous Montmorillonite-Silica composites prepared by using different amount Alginate as sacrificial template, for removal of Rhodamine B is investigated. By alternating Alginate amount it is aimed to switch the porosity of adsorbents thus the adsorption capacities of adsorbents. Synthesized adsorbents had been characterized by using Scanning Electron Microscopy, X-ray diffraction, Fourier transform infrared spectroscopy and N2-Ads/Des techniques. It is observed that beside the decrease in the micropore volume, the total pore volume of the adsorbents increased with the increasing of used Alginate amount. The total pore volumes of adsorbents synthesized with different Clay/Alginate ratio (10, 5, 1) were found as 0.116, 0.172, and 0.178 cm3/g, respectively. Batch adsorption studies showed that the maximum removal efficiencies were obtained at acidic conditions and the adsorbents had better fit with Freundlich isotherm. Qm values obtained from Langmuir isotherm were found as 24.47, 31.97 and 28.48 mg/g for synthesized adsorbents. Also, adsorption kinetic studies showed that for all adsorbents, experimental data had good fit to the pseudo-second order kinetics model. The model parameters were found as 5.9,6.3 and 6.5 (10–3 g/ (mg min). Thermodynamic parameters were also investigated in the study. Negative ∆Go values pointed out that the adsorption of RhB onto synthesized adsorbents was favorable process. Positive values of ∆Ho and ΔS indicated that the adsorption of RhB on adsorbents were endothermic and rising of randomness during the adsorption of RhB on the surface of the adsorbent. Adsorbents could be recovered at least five times without significant decrease in adsorption capacity.

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Study of variables for optimization of the dye indosol adsorption process using red mud and clay as adsorbents

Cited by 8 publications

References 24 publications

Optimizing Conditions for Scandium Extraction from Bauxite Residue Using Taguchi Methodology

Optimizing Conditions for Scandium Extraction from Bauxite Residue Using Taguchi Methodology

Nanostructured Carbon-Based Materials for Adsorption of Organic Contaminants from Water

Synthesis of Na-Alginate templated Montmorillonite-Silica Composite as adsorbent for removal of Rhodamine B

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