Organic Dyes Versus Adsorption Processing

López, Félix A.

doi:10.20944/preprints202105.0599.v1

Cited by 13 publications

(1 citation statement)

References 81 publications

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“…In this work, Design-Expert 7.0.0 software (Stat-Ease Inc., USA) was used, where the central composite design (CCD) using a response surface methodology (RSM) was applied to correlate and optimize four operation process variables (i.e., initial dye concentration; solution pH; adsorbent dose; and contact time) in relation to the dye removal. The minimum and maximum ranges of the four operational process variables were the initial dye concontration (A) (10-50 mg/L), solution pH (B) (3)(4)(5)(6)(7)(8)(9), adsorbent dose (C) (200-1000 mg/L), and contact time (D) (30-90 min). Table 1 presents the high, center, and low levels of the four independent variables investigated in this study.…”

Section: Experimental Designmentioning

confidence: 99%

Green Synthesis of Fe3O4 Nanoparticles and its Applications in Wastewater Treatment.

Bassim

Mageed

AbdulRazak

2022

Preprint

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In this paper, extract of Citrus aurantium (CA) was used as a green approach for the preparation of Fe3O4 nanoparticles. The green Fe3O4 (Fe3O4/CA) was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy analysis (EDX), Fourier-transform infrared (FTIR) spectroscopy, Brunauer–Emmett–Teller (BET) surface area measurement, vibrating sample magnetometry (VSM), and zeta potential (ZP) measurements. The synthesized Fe3O4/CA was used to remove methylene blue (MB) dye from an aqueous solution. A four-factor central composite design (CCD) combined with response surface modeling (RSM) was used to maximize the MB dye removal. The four independent variables, which were initial dye concentration (10-50 mg/L), solution pH (3-9), adsorbent dose (ranging from 200-1000 mg/L), and contact time (30-90 min), served as inputs to the model of the % dye removal. The findings yielded by an analysis of variance (ANOVA) confirmed the high significance of the regression model. The predicted values of the MB dye removal were in good agreement with the corresponding experimental values. Optimized conditions for the maximum MB dye removal (93.14%) by Fe3O4/CA were the initial dye concentration (10.02 mg/L), pH (8.98), adsorbent mass (997.99 mg/L), and contact time (43.71 min). The validity of the quadratic model was examined, and good agreement was found between the experimental and predicted values. Our findings demonstrated that green Fe3O4 NPs can be used as an adsorbent for MB dye removal.

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Section: Experimental Designmentioning

confidence: 99%

Green Synthesis of Fe3O4 Nanoparticles and its Applications in Wastewater Treatment.

Bassim

Mageed

AbdulRazak

2022

Preprint

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Adsorption Separation of Various Polar Dyes in Water by Oil Sludge-Based Porous Carbon

Cheng,

Peng,

Liu

et al. 2024

Applied Sciences

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The pollution caused by printing and dyeing wastewater is increasingly severe, posing significant harm to aquatic plants and animals. In this study, porous carbon was synthesized via the high-temperature pyrolysis of light and heavy organic matter present in oily sludge, utilizing low oil content sludge as the raw material and zinc chloride as a chemical activator. The results exhibited a significant increase in the specific surface area of the oily sludge-based porous carbon, from 4.95 m²/g to 10.95 m²/g. The effects of various parameters such as pH, amount of sorbent, dye concentration, temperature, and contact time on dye removal have been studied. The results showed that the oil sludge-based porous carbon exhibited high efficiency in removing Malachite Green from aqueous solutions, which has low polarity and remains consistently above 97%. The removal rate of Crystal Violet, which is more polar, was as low as 24.14%. The corresponding adsorption capacities were 33.41 mg/g for Malachite Green, 16.41 mg/g for Crystal Violet, and 13.56 mg/g for Methylene Blue. The adsorption capacity of OSC700 for three types of dyes was characterized by monolayer adsorption, primarily driven by chemical adsorption, with significant contributions from electrostatic and hydrophobic effects. The adsorption process was spontaneous, exothermic, and accompanied by an increase in entropy. For less polar substances, the adsorption on oily sludge-based porous carbon is primarily driven by aromatic functional groups on the carbon surface, hydrophobicity, π-π electron-donor-acceptor (π-π EDA) interactions, and surface hydrogen bond formation. In contrast, for more polar dyes, electrostatic and hydrophobic interactions dominate, with electrostatic adsorption being the predominant mechanism and minimal hydrogen bond formation during adsorption.

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Green Synthesis of Fe3O4 Nanoparticles and Its Applications in Wastewater Treatment

et al. 2022

View full text Add to dashboard Cite

In this paper, the extract of Citrus aurantium (CA) was used as a green approach for the preparation of Fe3O4 nanoparticles. The green Fe3O4 (Fe3O4/CA) was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy analysis (EDX), Fourier-transform infrared (FTIR) spectroscopy, Brunauer–Emmett–Teller (BET) surface area measurement, and vibrating sample magnetometry (VSM). The synthesized Fe3O4/CA was used to remove methylene blue (MB) dye from an aqueous solution. A four-factor central composite design (CCD), combined with response surface modeling (RSM), was used to maximize the MB dye removal. The four independent variables, which were initial dye concentration (10–50 mg/L), solution pH (3–9), adsorbent dose (ranging from 200–1000 mg/L), and contact time (30–90 min), were used as inputs to the model of the perecentage dye removal. The results yielded by an analysis of variance (ANOVA) confirmed the high significance of the regression model. The predicted values of the MB dye removal were in agreement with the corresponding experimental values. Optimized conditions for the maximum MB dye removal (93.14%) by Fe3O4/CA were the initial dye concentration (10.02 mg/L), pH (8.98), adsorbent mass (997.99 mg/L), and contact time (43.71 min). The validity of the quadratic model was examined, and good agreement was found between the experimental and predicted values. Our findings demonstrated that green Fe3O4NPs is a good adsorbent for MB removal.

show abstract

Organic Dyes Versus Adsorption Processing

Cited by 13 publications

References 81 publications

Green Synthesis of Fe3O4 Nanoparticles and its Applications in Wastewater Treatment.

Green Synthesis of Fe3O4 Nanoparticles and its Applications in Wastewater Treatment.

Adsorption Separation of Various Polar Dyes in Water by Oil Sludge-Based Porous Carbon

Green Synthesis of Fe3O4 Nanoparticles and Its Applications in Wastewater Treatment

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