Activated carbon from H3PO4 -activated Moringa Stenopetale Seed Husk for removal of methylene blue: Optimization using the response surface method (RSM)

Ofgea, Natinael Mekonnen; Tura, Alemu Mekonnen; Fanta, Gada Muleta

doi:10.1016/j.indic.2022.100214

Cited by 17 publications

(8 citation statements)

References 37 publications

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“…The maximum adsorption capacity of MB is 417 mg g − 1 . The separation factor (RL) was also computed from the Langmuir isotherm and utilized to assess whether the adsorption was favorable [77]. The obtained RL ranged from 0.05-0.86 indicating good dye adsorption to the adsorbent (favorable adsorption process).…”

Section: Model Parameters Resultsmentioning

confidence: 99%

“…At low concentrations, the relationship between active sites of the surface and adsorbate molecules is signi cant, guaranteeing all the dye molecules will be retained in the adsorbent surface. In contrast, above optimal MB concentration, the active sites required for the dye's adsorption will lack, which can retard the MB adsorption by activated carbon [34,41,76,77].…”

Section: Methylene Blue Sorption: Effect Initial Concentration Isothermsmentioning

confidence: 99%

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Prospective life cycle assessment of activated carbon production derived from banana peel for methylene blue dye removal

Pereira,

Maia,

Silva

et al. 2024

Preprint

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Activated carbon (AC) produced from agro-industrial waste is an interesting adsorbent in water purification and effluent treatment processes. In this work, activated biochar (BFAC) from banana peel waste (BPF) was prepared by chemical activation (NaOH) followed by pyrolysis at 600 °C to remove methylene blue (MB) from wastewater. BFAC was characterized by TGA, XRD, SEM, and FTIR techniques. The influence of dye concentration (10, 25, 50, 100, 250, and 500 mg L−1) and zero point charge (ZPC) were investigated. Besides, a Life Cycle Assessment (LCA) was conducted to evaluate and analyze the environmental effects of the developed process. BFAC presented a well-developed pore structure with a predominance of mesopores and macropores, influencing the MB removal capacity. The highest efficiency for dye removal was 62 % after 10 min to an initial concentration of 50 mg.L-1. Temkin, Langmuir, and Freundlich, isotherm models defined the adsorption isotherms well. The Langmuir model represented the best fit of experimental data for BFAC with a maximum adsorption capacity of 417 mg g−1. Regarding LCA, a prospective approach at the early stage of development was conducted to orient the transition from laboratory to industrial scale, aiming at providing a competitive CO2-based technological route. The proposed scenarios suggest that this route is promising either from the life cycle assessment or the circular economy perspective. Thus, BFAC can be considered as an adsorbent of great practical application for post-treatment of wastewater effluents aiming to remove contaminants.

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Section: Model Parameters Resultsmentioning

confidence: 99%

Section: Methylene Blue Sorption: Effect Initial Concentration Isothermsmentioning

confidence: 99%

Prospective life cycle assessment of activated carbon production derived from banana peel for methylene blue dye removal

Pereira,

Maia,

Silva

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…The removal efficiency was somewhat raised by increasing at least one variable (either dosage or contact time). The removal efficiency of hydrogel increased with increasing adsorbent dosage and contact time 31 . This results from an increase in the adsorption active site with adsorbent dosage increments as well as an increase in the electrostatic force between the adsorbent active site and the adsorbate with time.…”

Section: Kinetics Models Parameters Valuesmentioning

confidence: 93%

Expermental investigation on adsorption of methylene blue dye from waste water using corncob cellulose-based hydrogel

Majamo,

Amibo,

Mekonnen

2024

Sci Rep

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Hydrogel from corncob cellulose was synthesized in this investigation. The synthesized Hydrogel was characterized by SEM, XRD, and FTIR instruments. As the results indicate the synthesized hydrogel has required and important features, these suggest the suitability of hydrogel for the adsorption of methylene blue dye (MBD). Three important process variables (dosage, contact time, and initial concentration) with three levels were studied during the adsorption process at 30 °C and neutral pH. The efficiency of hydrogel for adsorption of MBD was determined in each experiment. The experimental results were statistically analyzed and interpreted. The maximum removal efficiency was achieved at 2.22 g/L of dosage, 80.36 min of contact time, and 74.54 mg/L of initial concentration. At this condition, 98.25% of MBD was achieved through experimental tests. Kinetics, isotherm, and thermodynamics studies were performed. Langmuir isotherm is more suitable to describe the adsorption process and the Pseudo second-order kinetic model fits this process. From the thermodynamics studies, all negative values of change in Gibbs free energy (ΔG°), and positive value of change in enthalpy (ΔH°), and change in entropy (ΔS°) indicate that the carried out experimental process is a spontaneous and endothermic. Moreover, the regeneration experiment for adsorbent was performed. The treatment of real textile industry waste water was conducted and the removal efficiency of hydrogel was 64.76%. This removal percentage reduction from sythetic aqueous solution is due to involvement of other pollutants in the real waste water. The synthesized hydrogel adsorbent is suitable up to the third cycle without significant loss in removal efficiency.

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“…[5,6] These materials need specific attributes, making activated carbons a favored choice for adsorption due to their high sorption capacity, swift kinetics, lack of toxic by-products, and economical production. [7,8] Activated carbon (biochar) can be produced through either physical or chemical activation. The physical activation method comprises a two-step process.…”

Section: Introductionmentioning

confidence: 99%

Methyl Red Adsorption on Biochar Obtained by Physical Activation of Caraway Seeds with Carbon Dioxide

Paluch,

Bazan‐Wozniak,

Pietrzak

2024

ChemPhysChem

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In this study carbon adsorbents were produced from caraway (Carum carvi L.) seeds, through direct and physical activation by carbon dioxide. The resulting biochar adsorbents were analyzed using low‐temperature nitrogen adsorption‐desorption isotherms and Boehm titration. Furthermore, the acid‐base properties of the biochar samples obtained were examined, and the pH of their aqueous extracts was determined. The obtained adsorbents had a specific surface area ranging between 10 to 70 m2/g. Resulting carbon materials exhibited a predominance of basic groups on their surfaces. The sorption capacities of methyl red for the samples varied from 3 to 20 mg/g. Conducted adsorption studies determined, that the adsorption kinetics of the dye on biochar materials followed a pseudo‐second order model and the adsorption process was best described by the Freundlich isotherm, indicating the development of a multi‐layer adsorbate on their surfaces. The effectiveness of adsorption in aqueous solutions of methyl red increased with the rise in process temperature. Moreover, the adsorption process was found to be spontaneous and endothermic based on thermodynamic investigations.

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Activated carbon from H3PO4 -activated Moringa Stenopetale Seed Husk for removal of methylene blue: Optimization using the response surface method (RSM)

Cited by 17 publications

References 37 publications

Prospective life cycle assessment of activated carbon production derived from banana peel for methylene blue dye removal

Prospective life cycle assessment of activated carbon production derived from banana peel for methylene blue dye removal

Expermental investigation on adsorption of methylene blue dye from waste water using corncob cellulose-based hydrogel

Methyl Red Adsorption on Biochar Obtained by Physical Activation of Caraway Seeds with Carbon Dioxide

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