Removal of safranin-O dye from aqueous solution using modified red mud: kinetics and equilibrium studies

Sahu, Manoj Kumar; Patel, Raj Kishore

doi:10.1039/c5ra15780c

Cited by 45 publications

(8 citation statements)

References 39 publications

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“…While Othman et al [ 65 ] suggested 1666.67 mg/g for the removal of MB dye, Tharaneedhar et al [ 60 ] reported 82.71 mg/g and Gourbanpour et al [ 18 ] obtained 810.4 mg/g for their developed composite. For SF dye removal, Abukhadra et al [ 66 ] and Sahu et al [ 67 ] reported 65.35 and 89.47 mg/g, respectively. The Q m values obtained in this work are 249.9 and 81.83 mg/g for MB and SF, respectively, both of which are within the range of reported values.…”

Section: Modelingmentioning

confidence: 99%

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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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Section: Modelingmentioning

confidence: 99%

Section: Isotherm Adsorptionmentioning

confidence: 99%

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

et al. 2020

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“…For Safranin, the absorbance peaks observed were mainly aliphatic primary amine N–H stretching (3,000–3,560 cm −1 ) and –OH stretching in the range of 3,589–4,000 nm in the control sample. However, in the decolorized test sample, the absorbance peaks varied: C–L stretching at 625 nm, C–N stretching 1,042–1,626 nm, C–C stretching 1,626 nm, C–H stretching 2,853–3,243 nm, and –OH stretching 3,283–3,564 nm ( Babu et al, 2015 ; Sahu and Patel, 2015 ). The shift in the peaks suggests a breakdown of functional groups that may have changed the original structure of the dyes in the decolorized test samples ( Chen et al, 2008 ; Ali et al, 2009 ).…”

Section: Resultsmentioning

confidence: 99%

“…The sample mixture was then analyzed using the instrument by mounting the sample on the sample holder using the ring holder and the transmittance scanned from the range of 4,000–400 cm −1 with a resolution of 1 cm −1 set for 20 scans per min ( Babu et al, 2013 ). The obtained peaks were compared with the published reference dye peaks ( Sigma-Aldrich, n.d. ; Sun et al, 2013 ; Maity et al, 2015 ; Sahu and Patel, 2015 ; Asses et al, 2018 ).…”

Section: Methodsmentioning

confidence: 99%

Bio-Decolorization of Synthetic Dyes by a Halophilic Bacterium Salinivibrio sp.

et al. 2020

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Synthetic dyes, extensively used in various industries, act as pollutants in the aquatic environment, and pose a significant threat to living beings. In the present study, we assessed the potential of a halophilic bacterium Salinivibrio kushneri HTSP isolated from a saltpan for decolorization and bioremediation of synthetic dyes. The genomic assessment of this strain revealed the presence of genes encoding the enzymes involved in decolorization mechanisms including FMN-dependent NADH azoreductase Clade III, which cleave the azo bond of the dye, and the enzymes involved in deamination and isomerization of intermediate compounds. The dye decolorization assay was performed using this bacterial strain on three water-soluble dyes in different concentrations: Coomassie brilliant blue (CBB) G-250 (500–3,000 mg/L), Safranin, and Congo red (50–800 mg/L). Within 48 h, more than 80% of decolorization was observed in all tested concentrations of CBB G-250 and Congo red dyes. The rate of decolorization was the highest for Congo red followed by CBB G-250 and then Safranin. Using UV-Visible spectrometer and Fourier Transform Infrared (FTIR) analysis, peaks were observed in the colored and decolorized solutions. The results indicated a breakdown of dyes upon decolorization, as some peaks were shifted and lost for different vibrations of aromatic rings, aliphatic groups (–CH2, –CH3) and functional groups (–NH, –SO3H, and –SO3−) in decolorized solutions. This study has shown the potential of S. kushneri HTSP to decolorize dyes in higher concentrations at a faster pace than previously reported bacterial strains. Thus, we propose that our isolated strain can be utilized as a potential dye decolorizer and biodegradative for wastewater treatment.

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“…As well as, this process is fast, easy, more efficient and regenerable. The role of SDS is the fixation of MB by a chemical bond and it leads to increase the amount REMOVAL OF METHYLENE BLUE FROM AQUEOUS SOLUTIONS WITH HYBRID BIOPROCESS 319 adsorbed in MB (Azizi et al, 2021;Que et al, 2018;Irani and Jadid, 2015;Sahu et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Removal of methylene blue from aqueous solutions with hybrid bioprocess: biosorption on modified cork powder and soluble turnip peroxidase

2022

Global NEST: The International Journal

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<p>Methylene blue (MB) removal from aqueous media using hybrid bioprocess: biosorption on modified cork powder (SDS-cork) and soluble turnip peroxidase (STP) was investigated. Cork powder was modified with sodium lauryl sulphate (SDS). Chemical composition of the biosorbent were characterized by infrared before and after biosorption. The hybridization was carried out under the optimal conditions of the two processes: pH=7, T=40 °C, [H2O2]=10 mM for enzyme activity(EA)=7 U mL-1 witch it was in excess for the EA= 5 and 3 U mL-1, [H2O2] = 15 mM for EA= 9 U mL-1 and [H2O2]=15 mM for EA= 11 U mL-1 with a treatment time that equals the sum of two optimal treatment times, and a mass of SDS-cork 0.04 g with a diameter <0.16 mm. The feasibility and performance of this hybridization was tested according to two parameters the initial concentration of MB which varied between 200 and 500 mg L-1 and the enzymes activities which has varied between 3 and 11 U mL-1. The minimum removal percentage of MB was satisfactory according to 93% for [MB] = 500 mg/L and an EA of 3 U mL-1, otherwise the maximum removal percentage was very satisfactory being in the order of 99.9% for a [MB] = 200 mg L-1 and EA= 11 U mL-1.</p>

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Removal of safranin-O dye from aqueous solution using modified red mud: kinetics and equilibrium studies

Abstract: Adsorption of safranin-O dye on SDS modified red mud at different pH.

Cited by 45 publications

References 39 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

Bio-Decolorization of Synthetic Dyes by a Halophilic Bacterium Salinivibrio sp.

Removal of methylene blue from aqueous solutions with hybrid bioprocess: biosorption on modified cork powder and soluble turnip peroxidase

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