Brunauer-Emmett-Teller (B.E.T.), Langmuir and Freundlich Isotherm Studies for the Adsorption of Nickel Ions onto Coal Fly Ash

Agarwal, Ajay Kumar; Kadu, M. S.; Pandhurnekar, Chandrashekhar P.; Muthreja, I. L.

doi:10.3233/ajw-160016

Cited by 18 publications

(11 citation statements)

References 6 publications

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“…Various methods such as ion exchange, flotation, adsorption, chemical precipitation, biological treatment etc are often used to remove these metal ions from waste water (Agarwal et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Adsorption Isotherm Study for the Removal of Nickel Ions From Aqueous Solution Using Thermal Power Plant Fly Ash

Agarwal

Muthreja

Kadu³

et al. 2018

mijst

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Section: Introductionmentioning

confidence: 99%

Adsorption Isotherm Study for the Removal of Nickel Ions From Aqueous Solution Using Thermal Power Plant Fly Ash

Agarwal

Muthreja

Kadu³

et al. 2018

mijst

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“…Adsorption of copper ions by composite materials is a dynamic equilibrium process. In order to study the adsorption process of composite materials, we used the most commonly used chemical sorption behavior of the Langmuir and Freundlich isothermal model, as shown in Equations (5) and (6):

where q m is the maximum adsorption capacity, mg·g −1 ; K L is the constant related to adsorption equilibrium; K F is the adsorption equilibrium constant of Freundlich; n is the constant of Freundlich model [ 38 , 39 ]. The Langmuir isothermal equation and Freundlich isothermal equation were used to fit the data of copper ions adsorbed by bentonite, GO, B-nZVI, and GO-B-nZVI, and the results are shown in Table 4 .…”

Section: Resultsmentioning

confidence: 99%

Nanoscale Zero-Valent Iron Decorated on Bentonite/Graphene Oxide for Removal of Copper Ions from Aqueous Solution

Shao

Zhou

et al. 2018

Materials

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The removal efficiency of Cu(II) in aqueous solution by bentonite, graphene oxide (GO), and nanoscale iron decorated on bentonite (B-nZVI) and nanoscale iron decorated on bentonite/graphene oxide (GO-B-nZVI) was investigated. The results indicated that GO-B-nZVI had the best removal efficiency in different experimental environments (with time, pH, concentration of copper ions, and temperature). For 16 hours, the removal efficiency of copper ions was 82% in GO-B-nZVI, however, it was 71% in B-nZVI, 26% in bentonite, and 18% in GO. Bentonite, GO, B-nZVI, and GO-B-nZVI showed an increased removal efficiency of copper ions with the increase of pH under a certain pH range. The removal efficiency of copper ions by GO-B-nZVI first increased and then fluctuated slightly with the increase of temperature, while B-nZVI and bentonite increased and GO decreased slightly with the increase of temperature. Lorentz-Transmission Electron Microscope (TEM) images showed the nZVI particles of GO-B-nZVI dispersed evenly with diameters ranging from 10 to 86.93 nm. Scanning electron microscope (SEM) images indicated that the nanoscale iron particles were dispersed evenly on bentonite and GO with no obvious agglomeration. The qe,cal (73.37 mg·g−1 and 83.89 mg·g−1) was closer to the experimental value qe,exp according to the pseudo-second-order kinetic model. The qm of B-nZVI and GO-B-nZVI were 130.7 mg·g−1 and 184.5 mg·g−1 according to the Langmuir model.

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“…Batch experiments were carried out using the jar-tester apparatus to determine the kinetic characteristics and the isotherms of the adsorption process of lead onto the BIOTON® biochar isotherms models [50][51][52]. The best fitting model was determined based on the value of R 2 .…”

Section: Batch Testsmentioning

confidence: 99%

“…BET isotherm represents an extension of the Langmuir model to the case of multimolecular adsorption [66]. This is generally applied to the case of physical adsorption, with the formation of several layers of adsorbate on the surface of the adsorbent [51].…”

Section: Biochar Characterizationmentioning

confidence: 99%

Application of Biochar to the Remediation of Pb-Contaminated Solutions

Boni¹,

Chiavola²,

Marzeddu³

2018

Preprint

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The BIOTON® biochar, produced by a wood biomass pyrolysis process, usually applied as a soil amendment, was investigated for a novel application, i.e. the adsorption of lead from contaminated solutions. The experimental activity firstly included the physical-chemical characterization of BIOTON®; SEM images were also obtained to highlight its internal structure. The adsorption process was investigated through batch and column experiments. Adsorption kinetics showed a very rapid achievement of the equilibrium conditions, i.e. at 2h and 4h for 50 mg/L and 100 mg/L initial Pb concentration, respectively. Complete removal also occurred within the same time. The Brunauer–Emmett–Teller model better fitted the equilibrium data for both Pb concentrations, whereas the kinetics were best represented by the pseudo second order model. The column tests showed that the addition of biochar as adsorbent media within the bed significantly extended the time of breakthrough and exhaustion, with respect to the column filled with soil only. The adsorption capacities of BIOTON® versus lead solutions was found to be comparable to that reported for commercial adsorbents. Therefore, BIOTON® can be considered a valid option, with the additional benefit to reduce the environmental impact since allows to recover a residue which alternately would need to be disposed of.

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Brunauer-Emmett-Teller (B.E.T.), Langmuir and Freundlich Isotherm Studies for the Adsorption of Nickel Ions onto Coal Fly Ash

Cited by 18 publications

References 6 publications

Adsorption Isotherm Study for the Removal of Nickel Ions From Aqueous Solution Using Thermal Power Plant Fly Ash

Adsorption Isotherm Study for the Removal of Nickel Ions From Aqueous Solution Using Thermal Power Plant Fly Ash

Nanoscale Zero-Valent Iron Decorated on Bentonite/Graphene Oxide for Removal of Copper Ions from Aqueous Solution

Application of Biochar to the Remediation of Pb-Contaminated Solutions

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