Liquid phase adsorptions of Rhodamine B dye onto raw and chitosan supported mesoporous adsorbents: isotherms and kinetics studies

Inyinbor, Adejumoke Abosede; Adekola, F. A.; Olatunji, Gabriel Ademola

doi:10.1007/s13201-016-0405-4

Cited by 60 publications

(36 citation statements)

References 28 publications

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“…The behaviour of adsorbent-adsorbate relationship with respect to time shows a robustly swift removal at the initial stage that became gradual as adsorption reached equilibrium. The initial prompt rise in q t is attributable to availability of reactive sites on adsorbents that were occupied as time progressed and this is consistent with reports of Adekola et al [47] Inyinbor et al [53,54] and Huang et al [39].…”

Section: Batch Equilibrium Experimentssupporting

confidence: 88%

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Nanostructured and surface functionalized corncob as unique adsorbents for anionic dye remediation

et al. 2020

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This study describes synthesis and characterization of corncob (CC), corncob nanocellulose (CCNC) and functionalized corncob (FCC) as unique adsorbents for methyl orange (MO) removal. Nanocellulose was synthesized via H 2 SO 4 hydrolysis and functionalization was achieved using H 3 PO 4 . All adsorbents were characterized by scanning electron microscopy coupled with energy dispersive X-ray and Fourier transform infra-red spectroscopy. Functionalization modified surface chemistry (disappearance of OH and appearance of PO 4 3− ), increased percentage carbon by 41.42% and produced welldeveloped pores. Nanocellulose retained intrinsic chemical properties of corncob though more porous with enhanced surface functionality prompted by more intense functional groups peaks and appearance of SO 4 2− . Maximum adsorption of MO occurred at pH 3.01, 4.11 and 2.09 for CC (54.34%), FCC (77.1%) and CCNC (96.81%) respectively. Adsorption parameters were fitted to four adsorption isotherms with Langmuir being the most appropriate to describe the adsorption process. Adsorption capacity increased from 17.86 mg g −1 in corncob to 60.82 mg g −1 in FCC and 206.67 mg g −1 in CCNC implying CCNC had the highest adsorption quality. The rate of adsorption was most accurately predicted by pseudo first order kinetics. Adsorption mechanism was governed by film diffusion with contribution from intra-particle diffusion. Adsorption process was spontaneous (− ∆G o ) at all temperatures (303-315 K), exothermic (− ∆H o ) and physical on CC (3.73 kJ mol −1 ) and CCNC (3.42 kJ mol −1 ) however it was endothermic (+ ∆H o ) and chemical on FCC (12.86 kJ mol −1 ). This study shows that CCNC is comparatively the best adsorbent with highest adsorption capacity.

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Section: Batch Equilibrium Experimentssupporting

confidence: 88%

“…Tempkin isotherm sorption binding constant was highest in FCC followed by CC and CCNC signifying the decrease in the involvement of chemical adsorption during the uptake of MO [53,54].…”

Section: Adsorption Isotherms Studies On CC Fcc and Ccncmentioning

confidence: 95%

Nanostructured and surface functionalized corncob as unique adsorbents for anionic dye remediation

et al. 2020

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“…However, CH 3 COOH efficiently desorbed Cu 2+ from ARHE surface with 72.65% desorption efficiency while desorption efficiency obtained for HCl was 25.62%. High desorption efficiency obtained with CH 3 COOH further shows that chemisorption was predominant in the Cu 2+ -ARHE system (Bello et al, 2008;Inyinbor et al, 2017). Low desorption efficiency of neutral water has previously been reported for chemisorbed heavy metals (Li et al, 2019).…”

Section: Desorption Studies Of Cu 2+ -Rhe and Cu 2+ -Arhe Systemsupporting

confidence: 59%

Copper scavenging efficiency of adsorbents prepared from Raphia hookeri fruit waste

Inyinbor

Adekola

Olatunji

2019

Sustainable Chemistry and Pharmacy

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Low cost adsorbents prepared from the epicarp of Raphia hookeri fruit were used for the removal of copper (II) ion from aqueous solution. The effects of operational parameters such as pH, concentration and contact time, dosage as well as interference of other ions were studied. Optimum pH for raw and modified biomass were 5.0 and 5.5 with percentage removal of 75.08% and 95.62% respectively. Concentration of competing ions greatly reduced Cu 2+ removal with both adsorbents while agitation speed had negligible effect on Cu 2+ uptake. Adsorbents surfaces were activated as temperature increased thus enhancing adsorbent adsorption capacity at high temperature. Adsorption kinetic data fitted best into the pseudo second order model while the thermodynamics studies confirmed adsorption spontaneity and feasibility. The Freundlich adsorption isotherm best described the adsorption process and the Langmuir maximum monolayer adsorption capacity for the raw (RHE) and acid treated (ARHE) biomass were 81.97 and 103.09 mg/g respectively. Chemisorption predominate the Cu 2+ -ARHE system hence desorption efficiency was obtained to be 72.65% with CH 3 COOH as eluent.

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“…Activated carbon has been found useful, and effective in dye removal but high cost of preparation and regeneration maintenance have made its use economically burdensome (Tan and Hameed 2010;Giwa et al 2015;Santhi and Kumar 2015). This has led to the use of effective alternative adsorbents such as hen feather (Mittal et al 2007), cassava pellets (Okewale et al 2013), perlite (Vijayakumar et al 2012), Rhizopus oyrzae biomass (Das et al 2006(Das et al , 2008, Mucor rouxii (Majumdar et al 2015) Raphia hookeri epicarp (Inyinbor et al 2016a), Chitosan (Inyinbor et al 2016b), silk (Jiwalak et al 2010), phosphoric acid-modified rice husk (Dada et al 2012) and sawdust of Parkia biglobosa (Giwa et al 2015) for the removal of dyes. However, as microparticles, these materials will require long time for maximum adsorption.…”

Section: Introductionmentioning

confidence: 99%

Novel biosynthesized silver nanoparticles from cobweb as adsorbent for Rhodamine B: equilibrium isotherm, kinetic and thermodynamic studies

et al. 2018

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This study has investigated the adsorption of Rhodamine B (Rh-B) dye on novel biosynthesized silver nanoparticles (AgNPs) from cobweb. The effects of contact time, initial pH, initial dye concentration, adsorbent dosage and temperature were studied on the removal of Rh-B and they significantly affected its uptake. Adsorption isotherms were evaluated using Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models. The adsorption process was best described by Langmuir isotherm with R 2 of 0.9901, indicating monolayer adsorption. The maximum adsorption capacity (q max ) of 59.85 mg/g showed that it has relatively high performance, while adsorption intensity showed a favourable adsorption process. Pseudo-secondorder kinetics fitted best the rate of adsorption and intra-particle diffusion revealed both surface adsorption and intra-particle diffusion-controlled adsorption process. Negative values of thermodynamic parameters (∆H°, ∆S° and ∆G°) indicated an exothermic and spontaneous adsorption process. The mean sorption energy (E) and activation energy (E a ) suggested the uptake of Rh-B onto AgNPs was chemical in nature (chemosorption).

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Liquid phase adsorptions of Rhodamine B dye onto raw and chitosan supported mesoporous adsorbents: isotherms and kinetics studies

Cited by 60 publications

References 28 publications

Nanostructured and surface functionalized corncob as unique adsorbents for anionic dye remediation

Nanostructured and surface functionalized corncob as unique adsorbents for anionic dye remediation

Copper scavenging efficiency of adsorbents prepared from Raphia hookeri fruit waste

Novel biosynthesized silver nanoparticles from cobweb as adsorbent for Rhodamine B: equilibrium isotherm, kinetic and thermodynamic studies

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