Comparative investigations of raw and alkali metal free banana peel as adsorbent for the removal of Hg2+ ions

Lavanya, K.M.; Florence, J. Annie Kamala; Vivekanandan, B.; Lakshmipathy, R.

doi:10.1016/j.matpr.2021.07.410

Cited by 7 publications

(5 citation statements)

References 16 publications

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“…The above also indicates that, by increasing the concentration of FeNPs in the adsorption system, As(V) ions removal is significantly improved. On the other hand, even though the adsorbent dose for AlgFe progressively increases, it was observed that As(V) removal does not increase beyond a 70 g/L dose, which can be attributed to the microspheres agglomeration or an increase in solution viscosity (Lavanya et al 2021), restraining the ions' diffusion towards the adsorption sites.…”

Section: Effect Of Adsorbent Dosementioning

confidence: 98%

Removal of As(V) from aqueous solutions using calcium-alginate microspheres with encapsulated iron nanoparticles

Ruiz-Mora

Alfaro-Cuevas-Villanueva

Martínez-Miranda

et al. 2021

Water Supply

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This work investigated As(V) removal from aqueous solutions using calcium alginate microspheres with encapsulated iron nanoparticles (FeNPs) in batch systems. The kinetic, equilibrium, and thermodynamic parameters of the adsorption process were evaluated. Adsorbents were characterized using Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy, and Zeta Potential techniques. The FeNPs were obtained by a simple and low-cost method and they were successfully encapsulated and uniformly dispersed over the microspheres' surface. Significantly fast adsorption kinetic rates were observed due to microspheres' particle size and FeNPs encapsulation. The chemisorption mechanism was recognized in both adsorbate-adsorbent systems. The As(V) isotherms data suggested that the process is associated with heterogeneous adsorption. Available sorption sites with different adsorption energies were related to the functional groups involved in removing As(V), such as hydroxyl and carboxyl groups. Significantly high adsorption capacities were obtained for both materials, suggesting they can be competitive compared to conventional adsorbents, even at low FeNPs concentrations. Besides FeNPs encapsulation enhancing arsenate removal, higher adsorption was obtained at slightly acidic pH values and, together with their small particle size, suggests that the microspheres have a great potential to be used as arsenate adsorbents in the water treatment for human consumption.

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Section: Effect Of Adsorbent Dosementioning

confidence: 98%

Removal of As(V) from aqueous solutions using calcium-alginate microspheres with encapsulated iron nanoparticles

Ruiz-Mora

Alfaro-Cuevas-Villanueva

Martínez-Miranda

et al. 2021

Water Supply

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“…Figure 8 shows the percentage of arsenate removal as a function of adsorbent dosage, in which the percentage of arsenate removal increases when the dosage rises because a higher dose of adsorbent provides more active sites for adsorption. However, such an increase is insignificant at a Ch‐Fe dosage above 8 g/L (Figure 8b) since the microsphere‘s aggregation, or even a rise in solution viscosity, could inhibit the arsenate ions migration towards the external surface adsorption sites [63] . The Ch‐Fe system shows up to 97 % arsenate removal at these experimental conditions.…”

Section: Resultsmentioning

confidence: 94%

“…However, such an increase is insignificant at a Ch-Fe dosage above 8 g/L (Figure 8b) since the microsphere's aggregation, or even a rise in solution viscosity, could inhibit the arsenate ions migration towards the external surface adsorption sites. [63] The Ch-Fe system shows up to 97 % arsenate removal at these experimental conditions. Similar results have been reported for removing As(V) using magnetic chitosanbased composite microparticles, using the coprecipitation method for iron impregnation, where a complete arsenate removal is reached at 10 g/L adsorbent dosage.…”

Section: Effect Of Adsorbent Dosementioning

confidence: 85%

Arsenate Adsorption from Aqueous Solutions Using Chitosan/Fe‐Nanoparticles Composite Microspheres

Manzo‐Valencia,

Alfaro‐Cuevas‐Villanueva,

Zárate‐Medina

et al. 2024

ChemistrySelect

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The adsorption behavior and synthesis of a chitosan microsphere composite with iron nanoparticles (Ch‐Fe) for the removal of arsenates [As(V)] from aqueous solutions were investigated. First, the chitosan microspheres (Ch‐SD) were obtained using the Spray Dryer volatilization technique (SD), optimizing their particle size. Then, the iron nanoparticles (Fe‐NPs) were prepared using the microwave precipitation technique. The composite was characterized, and the arsenate adsorption parameters were determined through batch‐type experiments. Significantly fast adsorption rates were observed for both adsorbents. Besides, Ch‐Fe and Ch‐SD effectively removed arsenates over a wide pH range. The hydroxyl and amino functional groups are involved in removing arsenates. The Pseudo‐second order and the Elovich models described arsenate kinetic sorption data for Ch‐Fe and Ch‐SD, respectively. The As(V) maximum adsorption capacities were 27.46 mg/g and 29.94 mg/g for Ch‐SD and Ch‐Fe, respectively, increasing significantly at elevated temperatures. The Langmuir‐Freundlich model adequately described the isothermal data for both materials, suggesting adsorption heterogeneity. The composite's surface impregnation with Fe‐NPs enhanced the Ch‐SD adsorption properties. The SD method was suitable for obtaining the chitosan/Fe‐NPs microspheres and effectively removed As(V) from aqueous solutions.

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“…This study emphasized that the protonation step enhances the removal efficiency of Hg 2+ ions from aqueous solution. 110 Giraldo et al explored calcinated sugarcane bagasse (CSB) as an alternative adsorbent. CSB showed the maximum adsorption efficiency of 13.6 mg of Hg(II)/ g. The kinetic studies suggested that the adsorption process follows chemisorption, conrming the strong interactions due to complexation through coordinated bonds.…”

Section: Agriculture Waste-based Adsorbentsmentioning

confidence: 99%

Section: Agriculture Waste-based Adsorbentsmentioning

confidence: 99%

Comprehensive assessment of carbon-, biomaterial- and inorganic-based adsorbents for the removal of the most hazardous heavy metal ions from wastewater

Sheraz,

Shah,

Haleem

et al. 2024

RSC Adv.

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Comparative investigations of raw and alkali metal free banana peel as adsorbent for the removal of Hg2+ ions

Cited by 7 publications

References 16 publications

Removal of As(V) from aqueous solutions using calcium-alginate microspheres with encapsulated iron nanoparticles

Removal of As(V) from aqueous solutions using calcium-alginate microspheres with encapsulated iron nanoparticles

Arsenate Adsorption from Aqueous Solutions Using Chitosan/Fe‐Nanoparticles Composite Microspheres

Comprehensive assessment of carbon-, biomaterial- and inorganic-based adsorbents for the removal of the most hazardous heavy metal ions from wastewater

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