Sorption of Cd2+ and Pb2+ on Aragonite Synthesized from Eggshell

Habte, Lulit; Shiferaw, Natnael; Khan, Mohd Danish; Thriveni, Thenepalli; Ahn, Ji Whan

doi:10.3390/su12031174

Cited by 17 publications

(4 citation statements)

References 46 publications

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“…The better fitness of the Freundlich model to the equilibrium data than that of the Langmuir model conforms to the results of Sukpreabprom et al 2014 who investigated the removal of Cd(II) using bottom ash. However, the findings of this study contradict other studies carried out to remove Cd(II) using cheap biosorbents in which the Langmuir model shows a dominant fit to the experimental data (Habte et al 2020;Kumar et al 2018;Kabir et al 2015).…”

Section: Freundlich Isotherm Modelcontrasting

confidence: 99%

Decontamination of cadmium(II) from synthetic wastewater onto shea fruit shell biomass

Bayuo

2021

Appl Water Sci

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Shea fruit shells being an agricultural waste material was utilized to test its novelty as an inexpensive biosorbent for the elimination of Cd(II) from synthetic wastewater using the batch method. A batch study was employed to probe the impact of pH of the solution, contact time, temperature and initial concentration on the depollution of Cd(II) ions using unmodified Shea fruit shells biomass. The decontamination of Cd(II) by the unmodified Shea fruit shells biomass was found to be dependent on these adsorption parameters. The equilibrium data best represented Freundlich isotherm by a correlation coefficient (R2) of 0.9691. The kinetic models analyzed suggest pseudo-second-order ($${R}^{2} = 0.9515$$ R 2 = 0.9515 ) as the best fit model signifying that the removal of Cd(II) ions was on account of chemisorption. The positive values of the thermodynamic parameters, ΔH° and ΔS° reveal endothermic and increase of disorder of the process while the negative charge of ΔG° shows spontaneity of the system.

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Section: Freundlich Isotherm Modelcontrasting

confidence: 99%

Decontamination of cadmium(II) from synthetic wastewater onto shea fruit shell biomass

Bayuo

2021

Appl Water Sci

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“…Several researchers have studied the removal of heavy metals with natural limestone [ 13 , 14 , 15 ]. In recent years, various biogenic calcium carbonate wastes have been used as low-cost adsorbents to remove heavy metals from solutions such as eggshells [ 16 , 17 , 18 ], oyster shells [ 19 , 20 , 21 , 22 ], crustacean shells [ 23 ], clam shells [ 24 ], Anadara inaequivalvis shells [ 25 ], golden apple snail shells [ 26 ] and cockle shells [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Heavy Metals Ions from Mining Metallurgical Tailings Leachate Using a Shell-Based Adsorbent: Characterization, Kinetics and Isotherm Studies

2022

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This study defines the optimal parameters that allow the use of waste mollusk shells (WS) to remove heavy metals from three mining and metallurgical leachates. First, the influence of parameters such as pH, contact time, initial metal concentration, adsorbent dose and the presence of co-ions in Cu2+, Cd2+, Zn2+ and Ni2+ adsorption was investigated in synthetic solutions. Metal uptake was found to be dependent on the initial pH of the solution, the removal rate increasing with the increase in pH, showing the highest affinity at pH 5–6. The removal efficiency at lower concentrations was greater than at higher values. The competitive adsorption results on bimetallic solutions showed that the adsorption capacity of the sorbent was restricted by the presence of other ions and suppressed the uptake of heavy metals compared to the single adsorption. Cu2+ was the metal that most inhibited the removal of Cd2+, Zn2+ and Ni2+. The Langmuir isotherm provided the best fit to the experimental data for Cu2+, Cd2+ and Zn2+ and the Freundlich isotherm, for Ni2+. The data showed that the maximum adsorption capacity amax for Zn2+, Cd2+ and Cu2+, was 526.32 mg g−1, 555.56 mg g−1 and 769.23 mg g−1, respectively. Sorption kinetics data best fit the pseudo-second-order kinetic model. The results obtained in the tests with three mining and metallurgical leachates showed that WS were effective in simultaneously removing several heavy metals ions such as Cu, Ni, Zn, Cd, Ni, As and Se.

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“…Sorption of Pb on the CaCO 3 surfaces is reported to be very high by Godelitsas et al [63] and they also reported that the mechanism of Pb sorption on the calcite surface also showed the formation of PbCO 3 (cerussite), formation of cerussite is helpful in reducing hazardous effects of Pb. Mechanism of sorption of heavy metals on the CaCO 3 precipitates is proposed to be ion exchange, precipitation of heavy metal carbonates and hydroxycarbonate forms, adsorption and complexation [64].…”

Section: Sorption Of Individual Heavy Metalsmentioning

confidence: 99%

Heavy Metal Immobilization Studies and Enhancement in Geotechnical Properties of Cohesive Soils by EICP Technique

Moghal

Lateef²,

Mohammed³

et al. 2020

Applied Sciences

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Soil treatment methods to cope with ever-growing demands of construction industry and environmental aspects are always explored for their suitability in different in-situ conditions. Of late, enzyme induced calcite precipitation (EICP) is gaining importance as a reliable technique to improve soil properties and for contaminant remediation scenarios. In the present work, swelling and permeability characteristics of two native Indian cohesive soils (Black and Red) are explored. Experiments on the sorption and desorption of multiple heavy metals (Cd, Ni and Pb) onto these soils were conducted to understand the sorptive response of the heavy metals. To improve the heavy metal retention capacity and enhance swelling and permeability characteristics, the selected soils were treated with different enzyme solutions. The results revealed that EICP technique could immobilize the heavy metals in selected soils to a significant level and reduce the swelling and permeability. This technique is contaminant selective and performance varies with the nature and type of heavy metal used. Citric acid (C6H8O7) and ethylene diamine tetra-acetic acid (EDTA) were used as extractants in the present study to study the desorption response of heavy metals for different EICP conditions. The results indicate that calcium carbonate (CaCO3) precipitate deposited in the voids of soil has the innate potential in reducing the permeability of soil up to 47-fold and swelling pressure by 4-fold at the end of 21 days of curing period. Reduction in permeability and swell, following EICP treatment can be maintained with one time rinsing of the treated soil in water to avoid dissolution of precipitated CaCO3. Outcomes of this study have revealed that EICP technique can be adopted on selected native soils to reduce swelling and permeability characteristics followed by enhanced contaminant remediation enabling their potential as excellent landfill liner materials.

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Sorption of Cd2+ and Pb2+ on Aragonite Synthesized from Eggshell

Cited by 17 publications

References 46 publications

Decontamination of cadmium(II) from synthetic wastewater onto shea fruit shell biomass

Decontamination of cadmium(II) from synthetic wastewater onto shea fruit shell biomass

Adsorption of Heavy Metals Ions from Mining Metallurgical Tailings Leachate Using a Shell-Based Adsorbent: Characterization, Kinetics and Isotherm Studies

Heavy Metal Immobilization Studies and Enhancement in Geotechnical Properties of Cohesive Soils by EICP Technique

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