Adsorption of Cr(VI) from Aqueous Solution onto a Mesoporous Carbonaceous Material Prepared from Naturally Occurring Pongamia pinnata Seeds

Kv, Brungesh; BM, Nagabhushana; RS, Raveendra

doi:10.4172/2161-0525.1000330

Cited by 4 publications

(4 citation statements)

References 28 publications

(30 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In DARCO, a broad band was observed at 3325 cm −1 due to O-H stretching vibration, whereas in PP and Ni@PP the same band may have disappeared due to calcination. In the case of PP and Ni@PP, the band at 2954 cm −1 may be ascribed to aliphatic C-H stretching vibrations of CH 3 , CH 2, and CH in carbonaceous material, whereas the the bands near 1750 cm −1 and 2200-2400 cm −1 can be ascribed to the C=O axial deformation and at 1600 cm −1 can refer to C=C stretching vibration [28,29]. FTIR spectra of PP and Ni@PP showed bands at 1375 cm −1 due to -CH 3 bending vibration; however, C-O stretching of ethers, phenols, esters, acids, and carboxylate are mostly identified in oxidized carbon material at 1415 cm −1 and 1010 cm −1 and also the O-H bending vibrations attributed at 1110 [30,31].…”

Section: Characterization Of the Adsorbentsmentioning

confidence: 99%

“…(3) ln(q e ) = ln where C e (mg•L −1 ) is the equilibrium concentration of DBT, q e is the maximum adsorption capacity obtained experimentally, K f (mg•g −1 ) is the Freundlich constant representing the quantity of DBT adsorbed onto adsorbents, and 1/n denotes the adsorption intensity [28]. A lower value of 1/n shows the greater possibility of a heterogeneous reaction.…”

Section: Adsorption Equilibrium Studymentioning

confidence: 99%

See 1 more Smart Citation

Desulfurization studies of liquid fuels through nickel-modified porous materials from Pongamia pinnata

Zaidi

Sorokhaibam

2020

Appl Petrochem Res

View full text Add to dashboard Cite

A new biomass-based carbonaceous adsorbent has been developed from Pongamia pinnata and its effect upon nickel modification- and adsorption-coupled ultrasonication was investigated. Adsorption experiment of the model oil constituting 50 ppm dibenzothiophene in cyclohexane showed the maximum capacity as 8.11, 13.36, and 17.15 mg·g−1 for the commercial carbon DARCO, virgin bio-adsorbent PP, and nickel-modified adsorbent Ni@PP, respectively, with the time required for attaining equilibrium being the fastest in Ni@PP (120 min). The significant effect of ultrasonication was in attaining faster kinetics where ~ 96–98% removal was achieved in only 30 min. Also, the developed adsorbents had a very good specific surface area of 915 and 677 m2·g−1, respectively, for PP and Ni@PP. Investigation of the effect of higher initial sulfur concentration (200 ppm) indicated the significance of Ni modification, where a very high capacity of 66.18 mg·g−1 for Ni@PP was attained against 30.90 mg·g−1 for PP and 13.18 mg·g−1 for DARCO. Ni@ PP was also effective for the simultaneous removal of more refractory sulfur fractions from multicomponent model fuel systems and exhibited good regeneration ability till the fourth cycles or more. Cost estimation showed that the developed adsorbents are relatively ten times cheaper than commercial carbon, while the fixed-bed study indicated a breakthrough time of 250 min and 270 min for PP and Ni@PP, respectively. Graphic abstract

show abstract

Section: Characterization Of the Adsorbentsmentioning

confidence: 99%

Section: Adsorption Equilibrium Studymentioning

confidence: 99%

Desulfurization studies of liquid fuels through nickel-modified porous materials from Pongamia pinnata

Zaidi

Sorokhaibam

2020

Appl Petrochem Res

View full text Add to dashboard Cite

show abstract

“…(Asfaram et al 2015;Tewari et al 2017). From these techniques, adsorption has reported as an efficient and cost-effective alternative due to its simplicity, insensitivity to toxic substances and complete removal of pollutants rather than getting degraded to hazardous intermediates (Robinson et al 2001;Gupta & Saleh 2013;Brungesh et al 2015;Zhu et al 2016;Vergis et al 2018). Nanomaterials have attractive characteristic properties.…”

Section: Introductionmentioning

confidence: 99%

Integrated experimental and theoretical insights for Malachite Green Dye adsorption from wastewater using low cost adsorbent

Ibrahim

Moustafa

El-Molla

et al. 2021

Water Science and Technology

View full text Add to dashboard Cite

Water pollution is one of the problems that threaten humanity, and to confront it with only experimental procedures is not enough. It is necessary to integrate both practical methods and theoretical calculations to achieve decontamination with the most accurate interpretation. Hence, discussing the experimental mechanism study of Malachite Green (MG) dye adsorption with the help of the application of density functional theory (DFT) calculations is the main goal of this article. The experimental results affirmed that the preparation of γ-Al2O3 by precipitation method using (NH4)2CO3 improved the porosity, the surface capability, and the adsorbent capacities (qmax = 210 mg/g) at optimum condition compared with the previous studies. Kinetic and equilibrium studies showed that the adsorption follows the pseudo-second-order model and Freundlich isotherm model, respectively. Also, the calculated and observed thermodynamic parameters exerted positive values of ΔH° and ΔS°, which translates into an endothermic process with increasing disorder of the system. Theoretical calculations at DFT- B3LYP/6-31G (d,P) level of theory were calculated to show the selectivity of using the cationic form of MG in the experimental measurements to find the interaction mechanism. The electronic structure and intramolecular charge transfer of MG, its cationic form and the complex of MG-Al were investigated theoretically at the B3LYP/6-31 G (d,p) level of theory. The equilibrium geometries of MG, its cationic form and the complex of MG-Al were determined, and it was found that these geometries are non-planar. The EHOMO and ELUMO energies can be used to calculate the global properties; chemical hardness (η), softness (S) and electronegativity (χ). The calculated non-linear optical parameters (NLO) of the studied compounds, the electronic dipole moment (μ), first-order hyperpolarizability (β), the hyper-Rayleigh scattering (βHRS) and the depolarization ratio (DR), showed promising optical properties. Finally, the computational and the experimental results indicated that the adsorption efficiency of MG from wastewater was directly associated with the dye electrophilicity power.

show abstract

“…for removal of dyes from wastewater [3,6,7]. Among these methods, adsorption has emerged as an effective and economical alternative due to its ease of operation, simplicity of design, insensitivity to toxic substances and complete amputation of pollutants rather than getting degraded to hazardous intermediates [8,9]. The high cost and difficulty in regeneration are still concerned with the use of activated carbon, and it has motivated the research community to develop efficient and cost-effective alternative adsorbents for removal of dyes [5].…”

Section: Introductionmentioning

confidence: 99%

Process optimisation of methylene blue sequestration onto physical and chemical treated coffee husk based adsorbent

Murthy

Gowrishankar

2020

SN Appl. Sci.

View full text Add to dashboard Cite

Coffee husk (CH) was physically and chemically treated with autoclaving (SCH) and NaOH (NCH) to develop low-cost adsorbent for the removal of methylene blue (MB) from synthetic wastewater, and their adsorption efficiencies were evaluated in batch mode. The prepared adsorbent was characterised by SEM, FTIR and point of zero charge. The central composite rotatable design (CCRD) was employed to optimise the adsorption process parameters such as pH, adsorbent dosage and initial MB concentration. The second-order quadratic model fitted best with the experimental adsorption data, and ANOVA results showed that the developed model was significant. The linear terms in the model significantly influence the adsorption capacity of SCH and NCH, but interaction terms were not significant. At optimised conditions, the developed adsorbents can remove > 90% of MB from the aqueous solution. Freundlich model showed a better fit with the adsorption isotherm data with R 2 greater than 0.95. Kinetics of MB adsorption onto SCH and NCH followed the pseudo-second-order model. The maximum monolayer adsorption capacity was found to be 129 and 200 mg/g for SCH and NCH, respectively. The present study showed that pretreated coffee husk waste can be used as an alternative for expensive adsorbents for the removal of dyes from wastewater.

show abstract

Adsorption of Cr(VI) from Aqueous Solution onto a Mesoporous Carbonaceous Material Prepared from Naturally Occurring Pongamia pinnata Seeds

Cited by 4 publications

References 28 publications

Desulfurization studies of liquid fuels through nickel-modified porous materials from Pongamia pinnata

Desulfurization studies of liquid fuels through nickel-modified porous materials from Pongamia pinnata

Integrated experimental and theoretical insights for Malachite Green Dye adsorption from wastewater using low cost adsorbent

Process optimisation of methylene blue sequestration onto physical and chemical treated coffee husk based adsorbent

Contact Info

Product

Resources

About