SnO2 quantum dots decorated silica nanoparticles for fast removal of cationic dye (methylene blue) from wastewater

Dutta, Dibyendu; Thakur, Dinbandhu; Bahadur, D.

doi:10.1016/j.cej.2015.06.110

Cited by 83 publications

(23 citation statements)

References 37 publications

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“…Langmuir isotherms are applicable to homogeneous surfaces, which have equal adsorption affinity sites; while the Freundlich model assumes heterogeneous adsorption sites. The linear form of Langmuir isotherms is described by eq 1 [18]. mode.…”

Section: Effect Of Initial Cr(vi) Concentration and Adsorption Isothermsmentioning

confidence: 99%

Nanoporous carbon synthesized from grass for removal and recovery of hexavalent chromium

Pathan¹,

Pandita²

2016

Carbon letters

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Nanoporous carbon structures were synthesized by pyrolysis of grass as carbon precursor. The synthesized carbon has high surface area and pore volume. The carbon products were acid functionalized and characterized by Fourier transform infrared spectroscopy, X-ray diffraction, Brunauer-Emmett-Teller, transmission electron microscopy, and Energy Dispersive X-ray microanalysis. Acid functionalized nanoporous carbon was explored for use in removal of toxic Cr(VI) ions from aqueous media. An adsorption study was done as a function of initial concentration, pH, contact time, temperature, and interfering ions. The experimental equilibrium data fits well to Langmuir isotherm model with maximum monolayer adsorption capacity of 35.335 mg/g. The results indicated that removal obeys a pseudo-second-order kinetic model, and that equilibrium was reached in 10 min. A desorption study was done using NaOH. The results of the present study imply that acid functionalized nanoporous carbon synthesized from grass is an efficient, renewable, cost-effective adsorbent material for removal of hexavalent chromium due to its faster removal rate and reusability.

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Section: Effect Of Initial Cr(vi) Concentration and Adsorption Isothermsmentioning

confidence: 99%

Nanoporous carbon synthesized from grass for removal and recovery of hexavalent chromium

Pathan¹,

Pandita²

2016

Carbon letters

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“…The contact time is an important factor for designing the adsorption process in terms of practical and economic viability . Figure shows the effect of contact time on the removal of X‐3B dyes by CMWBFS with different initial dye concentrations.…”

Section: Resultsmentioning

confidence: 99%

Transport of reactive X‐3B dye at the interface between cationic surfactant‐modified water‐quenched blast furnace slag and aqueous solution

Wang

Huang

et al. 2018

Can J Chem Eng

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There is an emerging interest in the utilization of low‐cost industrial wastes in sustainable pollution control. This study investigated the use of water‐quenched blast furnace slag modified by cetyltrimethyl ammonium bromide as a low‐cost adsorbent for the removal of reactive brilliant red X‐3B from an aqueous solution. The results showed that the removal efficiency increased with an increasing slag dosage and an appropriate dosage for adsorption was 8 g/L. The adsorption efficiency of X‐3B onto modified slag decreased when the pH increased from 2 to 12. The amount of dye uptake per unit of modified slag also increased with an increase in ionic strength, contact time, temperature, and initial dye concentration. The Freundlich isotherm model showed a good fit to the equilibrium adsorption data. Thermodynamic studies suggested the spontaneous and endothermic nature of the adsorption process. The adsorption kinetics followed the pseudo‐second‐order model and the rate constant increased with increasing temperature. These results can help understand the migration patterns of dye molecules at a modified slag‐water interface. It also has important implications for developing wastewater treatment techniques using low‐cost adsorbents.

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“…This can be returned to the fact that dyes photodegradation rate depends mainly on the possibility of formation of hydroxyl free radicals OH • on the catalyst surface and the reaction of the dye molecules with the formed radicals. The initial increase in the decay rate with the increase in initial dye concentration might be attributed to an increase in the probability of the reaction between the dye molecules and OH • [35,36]. The proposed mechanism for MB degradation can be summarized in the following steps.…”

Section: Effect Of the Light Intensity On The Mb Photocatalytic Decaymentioning

confidence: 99%

Effect of the Morphology of Tungsten Oxide Embedded in Sodium Alginate/Polyvinylpyrrolidone Composite Beads on the Photocatalytic Degradation of Methylene Blue Dye Solution

et al. 2020

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Tungsten oxide nanostructures were modified by oxygen vacancies through hydrothermal treatment. Both the crystalline structure and morphological appearance were completely changed. Spherical WO3·H2O was prepared from tungstic acid solution by aging at room temperature, while rod-like WO3·0.33H2O was prepared by hydrothermal treatment of tungstic acid solution at 120 °C. These structures embedded in sodium alginate (SA)/polyvinylpyrrolidone (PVP) were synthesized as novel porous beads by gelation method into calcium chloride solution. The performance of the prepared materials as photocatalysts is examined for methylene blue (MB) degradation in aqueous solutions. Different operation parameters affecting the dye degradation process, such as light intensity, illumination time, and photocatalyst dosage are investigated. Results revealed that the photocatalytic activity of novel nanocomposite changed with the change in WO3 morphology. Namely, the beads with rod nanostructure of WO3 have shown better effectiveness in MB removal than the beads containing WO3 in spherical form. The maximum degradation efficiency was found to be 98% for WO3 nanorods structure embedded beads, while the maximum removal of WO3 nanospheres structure embedded beads was 91%. The cycling-ability and reuse results recommend both prepared structures to be used as effective tools for treating MB dye-contaminated wastewaters. The results show that the novel SA/PVP/WO3 nanocomposite beads are eco-friendly nanocomposite materials that can be applied as photocatalysts for the degradation of cationic dyes in contaminated water.

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SnO2 quantum dots decorated silica nanoparticles for fast removal of cationic dye (methylene blue) from wastewater

Cited by 83 publications

References 37 publications

Nanoporous carbon synthesized from grass for removal and recovery of hexavalent chromium

Nanoporous carbon synthesized from grass for removal and recovery of hexavalent chromium

Transport of reactive X‐3B dye at the interface between cationic surfactant‐modified water‐quenched blast furnace slag and aqueous solution

Effect of the Morphology of Tungsten Oxide Embedded in Sodium Alginate/Polyvinylpyrrolidone Composite Beads on the Photocatalytic Degradation of Methylene Blue Dye Solution

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