Removal of Safranin dye from aqueous solution using magnetic mesoporous clay: Optimization study

Fayazi, Maryam; Afzali, Daryoush; Taher, Mohammad Ali; Mostafavi, Ali; Gupta, Vinod Kumar

doi:10.1016/j.molliq.2015.09.045

Cited by 110 publications

(39 citation statements)

References 54 publications

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“…Dye removal percentage as a fraction of initial dye concentration can be defined as:

where C 0 (mg/L) and C t (mg/L) are the initial dye concentration and dye concentration at time t , respectively [ 29 ]. The adsorption efficiency or adsorption capacity at equilibrium can be defined when the dye concentration of the solution reaches equilibrium.…”

Section: Methodsmentioning

confidence: 99%

Polyvinyl Alcohol/Calcium Carbonate Nanocomposites as Efficient and Cost-Effective Cationic Dye Adsorbents

et al. 2020

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A novel polyvinyl alcohol (PVA)/calcium carbonate-based double-layer cationic dye adsorbent was developed. Polyvinyl alcohol (50 wt %) and calcium carbonate (50 wt %) were used together with borax as a cross-linking agent. The nanocomposite was prepared using only water, without the need for any toxic solvent or hazardous chemical. The final samples were obtained by the solvent casting method. The nanocomposite adsorbent was characterized using a Fourier transform infrared (FTIR) spectroscope and a scanning electron microscope (SEM). The adsorption performance on two cationic dyes, i.e., methylene blue and safranin was studied. Dye adsorption was quantified by measuring the nanocomposite swelling, contact time, and dye concentration. Pseudo first-order and pseudo second-order kinetic models as well as intraparticle diffusion model were used to model the adsorption kinetics. Moreover, the isotherm dye adsorption was investigated by Langmuir and Freundlich models. The results revealed that the developed nanocomposite has relatively high adsorption efficiency and short adsorption time and retains its performance after several successive absorption–desorption processes. The results also showed that the pseudo-second-order model best describes the adsorption kinetics, and the Freundlich isotherm model has a better compatibility with the experimental data. Finally, an adsorption mechanism was proposed for the dye removal process. The developed PVA/CaCO3 nanocomposite can be potentially used for efficient dye removal in wastewater treatments.

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“…Dye removal percentage as a fraction of initial dye concentration can be defined as:

Section: Methodsmentioning

confidence: 99%

Polyvinyl Alcohol/Calcium Carbonate Nanocomposites as Efficient and Cost-Effective Cationic Dye Adsorbents

et al. 2020

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“…Safranin can cause eye burns which may be responsible for permanent injury to the cornea and conjunctiva in human and rabbit eyes. Contact with Safranin dye also causes skin and respiratory tract irritation [17]. The industrial applications of these dyes in different fields confirm the necessity for development of efficient adsorbents.…”

Section: Methodsmentioning

confidence: 99%

Removal of Colored Organic Pollutants from Wastewaters by Magnetite/Carbon Nanocomposites: Single and Binary Systems

Muntean

Nistor

Muntean

et al. 2018

Journal of Chemistry

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This work develops a methodology for selective removal of industrial dyes from wastewaters using adsorption technology based on magnetic adsorbents. The magnetic nanoparticles embedded within a matrix of activated carbon were tested as adsorbents for removal of industrial dyes from aqueous solutions. The effects of four independent variables, solution pH, initial concentration of pollutant, adsorbent dose, contact time, and their interactions on the adsorption capacity of the nanocomposite were investigated in order to optimize the process. The removal efficiency of pollutants depends on solution pH and increases with increasing the carbon content, with initial concentration of the pollutants, the temperature, and the dose of magnetite/carbon nanocomposites. Pseudo-second-order kinetic model was fitted to the kinetic data, and adsorption isotherm analysis and thermodynamics were used to elucidate the adsorption mechanism. The maximum adsorption capacities were 223.82 mg g −1 for Nylosan Blue, 114.68 mg g −1for Chromazurol S, and 286.91 mg g −1 for Basic Red 2. The regeneration and reuse of the sorbent were evaluated in seven adsorption/desorption cycles. The optimum conditions obtained for individual adsorption were selected as starting conditions for simultaneous adsorption of dyes. In binary systems, in normal conditions, selectivity decreases in the order: Red Basic 2 > Nylosan Blue > Chromazurol S.

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“…That is to say, the test method to predict the separated efficiency between chalcopyrite and molybdenite was reliable in this research. The adequate precision ratio (AP, precision criterion) was 65.21/43.73 (>4), and the coefficient of variance (CV, precision criterion) was 0.84/4.60% (<10%), proving the high accuracy of the predictive model [30][31][32]. The multivariate correlation coefficient R 2 equal to 0.997/0.994 means that the model could explain the change of the response value to the extent of 99.7%/99.4% for chalcopyrite and molybdenite, respectively.…”

Section: Model Fittings and Statistical Analysismentioning

confidence: 97%

The Effect of Seaweed Glue in the Separation of Copper–Molybdenum Sulphide Ore by Flotation

Chen

et al. 2018

Minerals

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Flotation separation of chalcopyrite from molybdenite was studied using seaweed glue (SEG) as a depressant. Flotation process and mechanism were examined by response surface methodology, flotation tests, adsorption tests, zeta potential measurements and fourier transform infrared (FT-IR) spectra. Response surface methodology with a Box-Behnken design suggested the optimal reagent schedule: pH 4, depressant seaweed glue 197 mg/L, collector amyl xanthate 16 mg/L and frother (methyl isobutyl carbinol) 20 mg/L, and selective separation of chalcopyrite and molybdenite was achieved by flotation. Comparison of SEG and traditional depressants indicated that the SEG could achieve a similar separation efficiency, and exhibited the advantages of environmental compatibility and economic adaptability. Co-adsorption of seaweed glue and amyl xanthate occurred on the surface of molybdenite, and is explained to happen through distinct mechanisms due to the heterogeneous nature of the surface. It is likely that seaweed glue depresses molybdenite by covering the dixanthogen resulting from adsorption of xanthate ions. It is shown that seaweed glue is as effective a depressant of Cu/Mo separation as cyanide.

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Removal of Safranin dye from aqueous solution using magnetic mesoporous clay: Optimization study

Cited by 110 publications

References 54 publications

Polyvinyl Alcohol/Calcium Carbonate Nanocomposites as Efficient and Cost-Effective Cationic Dye Adsorbents

Polyvinyl Alcohol/Calcium Carbonate Nanocomposites as Efficient and Cost-Effective Cationic Dye Adsorbents

Removal of Colored Organic Pollutants from Wastewaters by Magnetite/Carbon Nanocomposites: Single and Binary Systems

The Effect of Seaweed Glue in the Separation of Copper–Molybdenum Sulphide Ore by Flotation

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