Intraparticle diffusion of Cr(VI) through biomass and magnetite coated biomass: A comparative kinetic and diffusion study

Pholosi, Agnes; Naidoo, Eliazer Bobby; Ofomaja, Augustine E.

doi:10.1016/j.sajce.2020.01.005

Cited by 221 publications

(141 citation statements)

References 55 publications

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“…This suggests that ID is not the only diffusion mechanism involved, but there is also some contribution from liquid film diffusion (LFD) to the overall adsorption process 84 . A similar result was documented in the adsorption of Cr(VI) onto magnetite coated biomass 64 . The greater contribution of intraparticle diffusion in the removal of BB dye could be attributed to the ultra-sonication process employed, agitating the particles in solution via high frequency sound waves.…”

Section: Equilibrium Isotherm Evaluation Of the Process Isotherm Equsupporting

confidence: 84%

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Biogenic and chemically synthesized Solanum tuberosum peel–silver nanoparticle hybrid for the ultrasonic aided adsorption of bromophenol blue dye

Akpomie

Conradie

2020

Sci Rep

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This work was aimed at the synthesis of a hybrid (STpe-AgNP), obtained by impregnation of silver nanoparticles (AgNP) onto Solanum tuberosum peel (STpe), for the ultrasonic assisted adsorption of bromophenol blue (BB) dye. SEM, FTIR, XRD, EDX, TGA and BET techniques were used to characterize the adsorbents. The XRD, SEM and EDX confirmed successful impregnation of AgNPs onto STpe to form the hybrid. The AgNPs impregnated onto the hybrid were found to be water stable at various pH values of 2.0–9.0. Chi-square (χ2 < 0.024) and linear regression (R2 > 0.996) showed that the Freundlich model was best fitted among the isotherm models, corroborated by the oriented site model. Kinetic analysis conformed to the intraparticle diffusion and pseudo-first-order rate equations, while thermodynamics displayed a physical, spontaneous and endothermic adsorption process. The presence of competing Pb(II), Ni(II), Cd(II) and Zn(II) metal ions in solution interfered with the adsorption of BB onto the biosorbents. In terms of reusability, STpe and STpe-AgNP showed BB desorption of 91.3% and 88.5% respectively, using NaOH as eluent. Ultra-sonication significantly enhanced the adsorption of BB by both adsorbents, but the impregnation of AgNPs only slightly improved adsorption of the dye from the simulated wastewater. This study also illustrated that pristine STpe biomass waste is a cheap viable option for the decontamination of BB from water.

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Section: Equilibrium Isotherm Evaluation Of the Process Isotherm Equsupporting

confidence: 84%

“…1 b. The diffraction pattern depicted by STpe clearly conforms to the amorphous nature of lignocellulosic materials 33 , 64 . However, crystalline peaks were displayed in the diffraction patterns exhibited by STpe-AgNP attributed to the impregnation of the silver nanoparticles (AgNPs) onto the biosorbent.…”

Section: Resultsmentioning

confidence: 55%

Biogenic and chemically synthesized Solanum tuberosum peel–silver nanoparticle hybrid for the ultrasonic aided adsorption of bromophenol blue dye

Akpomie

Conradie

2020

Sci Rep

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“…were higher for NOS than for OSAC indicating that film diffusion was faster for NOS than for OSAC [47]. The calculus of the intraparticle diffusion coefficients showed that OSAC was a more favored medium than NOS for internal transfer of both the studied dyes.…”

Section: Kinetic Studies Of Mb and Mo Removalmentioning

confidence: 90%

Enhanced adsorptive removal of cationic and anionic dyes from aqueous solutions by olive stone activated carbon

Mahmoudi¹,

Hamdi²,

Ali³

et al. 2021

Comptes Rendus. Chimie

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“…Based on the intraparticle diffusion model, increasing the value of surface biosorption (intercept, C) with increasing temperature indicates a decrease in the rate of diffusion of MB from the external surface to the internal surfaces of biosorbent [64].…”

Section: Biosorption Kineticsmentioning

confidence: 99%

WITHDRAWN: Highly Efficient Magnetic Phosphoric Acid Modified Defatted Chlorella Vulgaris Algae ( MDCV/Fe3O4) as a Novel Biosorbent for Methylene Blue Removal

Salehi

Naziri

2021

Preprint

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Background:A novel biosorbent based on defatted Chlorella vulgaris (DCV) as a by-product of the biofuel industry was considered as an economical and inexpensive biosorbent in the form of magnetic modified defatted Chlorella vulgaris (MDCV/Fe3O4) for methylene blue (MB) removal. The lipid extraction was performed on raw Chlorella vulgaris (RCV). Phosphoric acid was selected as a DCV modifier. During acid modification, the variables affecting the biosorption capacity and the residual algae such as temperature (30-70 ), the contact time of DCV with acid (3-9 hr), the concentration of acid (2-6 mol/L), and the ratio of acid volume to DCV (30-70 mL/g) were investigated and optimized using Minitab-18 software. The modified defatted Chlorella vulgaris (MDCV) was prepared by acidification of DCV under optimal conditions. MDCV/ was prepared using the co-precipitation method for easy and low-cost separation of biosorbent. The XRD, FTIR, SEM, EDS, BET, and VSM analyses were performed to identify the structures and characteristics of RCV, DCV, MDCV, and MDCV/. Some experimentsere designed using Minitab-18 software to investigate the effects of temperature (5-45 ), contact time (30-90 min), biosorbent dosage (15-45 mg), initial concentration of MB (20-100 mg/L), and pH (5-9) on the biosorption capacity of MDCV/. The kinetic, isothermal and thermodynamic parameters were investigated on MDCV/.Results:The specific surface area of MDCV/ was 25.20 . RCV, DCV, and MDCV/ had a crystalline structure and MDCV had an amorphous structure. The data were most consistent with Pseudo-second-order and Freundlich models. The maximum biosorption capacity of MDCV/ was calculated in the amount of 32.44‌ mg/g. According to the positive values of and negative values of (-46.56 kJ/mol) and (-0.17 kJ/mol.K), the biosorption of MB on MDCV/ was non-spontaneous, exothermic with a decrease in irregularity.Conclusions:In this study, MDCV/ was applied as the MB biosorbent. Modifications such as lipid extraction, phosphoric acid modification and magnetization improved this biosorbent in its biosorption capacity and separation. Data were optimized in the acid modification and MB biosorption steps. Comparison of the characteristics of MDCV/ with unmodified species confirmed its high efficiency. Kinetic, isothermal and thermodynamic studies were also performed.

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Intraparticle diffusion of Cr(VI) through biomass and magnetite coated biomass: A comparative kinetic and diffusion study

Cited by 221 publications

References 55 publications

Biogenic and chemically synthesized Solanum tuberosum peel–silver nanoparticle hybrid for the ultrasonic aided adsorption of bromophenol blue dye

Biogenic and chemically synthesized Solanum tuberosum peel–silver nanoparticle hybrid for the ultrasonic aided adsorption of bromophenol blue dye

Enhanced adsorptive removal of cationic and anionic dyes from aqueous solutions by olive stone activated carbon

WITHDRAWN: Highly Efficient Magnetic Phosphoric Acid Modified Defatted Chlorella Vulgaris Algae ( MDCV/Fe3O4) as a Novel Biosorbent for Methylene Blue Removal

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Intraparticle diffusion of Cr(VI) through biomass and magnetite coated biomass: A comparative kinetic and diffusion study

Cited by 221 publications

References 55 publications

Biogenic and chemically synthesized Solanum tuberosum peel–silver nanoparticle hybrid for the ultrasonic aided adsorption of bromophenol blue dye

Biogenic and chemically synthesized Solanum tuberosum peel–silver nanoparticle hybrid for the ultrasonic aided adsorption of bromophenol blue dye

Enhanced adsorptive removal of cationic and anionic dyes from aqueous solutions by olive stone activated carbon

WITHDRAWN: Highly Efficient Magnetic Phosphoric Acid Modified Defatted Chlorella Vulgaris Algae ( MDCV/Fe3O4)&nbsp;as a Novel Biosorbent for Methylene Blue Removal

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Product

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WITHDRAWN: Highly Efficient Magnetic Phosphoric Acid Modified Defatted Chlorella Vulgaris Algae ( MDCV/Fe3O4) as a Novel Biosorbent for Methylene Blue Removal