Kinetics and Thermodynamics of Sulfate Adsorption on Magnetite at Elevated Temperatures

Qiu, Liyan; Burton, Gordon R.; Rousseau, Stephane; Qian, Jing

doi:10.1007/s10953-019-00933-8

Cited by 5 publications

(2 citation statements)

References 28 publications

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“…The negative value of the adsorption entropy (∆S°) indicates low reversibility in the process and low randomness in the liquid-solid interface in the adsorption process [ 69 ]. Furthermore, the negative values of the Gibbs free energy (∆G°) at all evaluated temperatures indicate that the removal of the metal occurs spontaneously for the adsorption of Pb 2+ and Ni 2+ [ 70 ].…”

Section: Resultsmentioning

confidence: 99%

“…The negative value of the adsorption entropy (∆S • ) indicates low reversibility in the process and low randomness in the liquid-solid interface in the adsorption process [69]. Furthermore, the negative values of the Gibbs free energy (∆G • ) at all evaluated temperatures indicate that the removal of the metal occurs spontaneously for the adsorption of Pb 2+ and Ni 2+ [70]. To investigate the temperature effect on the adsorption of Pb 2+ and Ni 2+ on the studied biomasses, the distribution coefficient, K d (L/g), was calculated at temperatures of 303.15, 328.15, and 353.15 K using Equation (3).…”

Section: Effect Of the Phmentioning

confidence: 99%

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High-Efficiency Removal of Lead and Nickel Using Four Inert Dry Biomasses: Insights into the Adsorption Mechanisms

2023

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In this study, inert dry bioadsorbents prepared from corn cob residues (CCR), cocoa husk (CH), plantain peels (PP), and cassava peels (CP) were used as adsorbents of heavy metal ions (Pb2+ and Ni2+) in single-batch adsorption experiments from synthetic aqueous solutions. The physicochemical properties of the bioadsorbents and the adsorption mechanisms were evaluated using different experimental techniques. The results showed that electrostatic attraction, cation exchange, and surface complexation were the main mechanisms involved in the adsorption of metals onto the evaluated bioadsorbents. The percentage removal of Pb2+ and Ni2+ increased with higher adsorbent dosage, with Pb2+ exhibiting greater biosorption capacity than Ni2+. The bioadsorbents showed promising potential for adsorbing Pb2+ with monolayer adsorption capacities of 699.267, 568.794, 101.535, and 116.820 mg/g when using PP, CCR, CH, and CP, respectively. For Ni2+, Langmuir’s parameter had values of 10.402, 26.984, 18.883, and 21.615, respectively, for PP, CCR, CH, and CP. Kinetics data fitted by the pseudo-second-order model revealed that the adsorption rate follows this order: CH > CP > CCR > PP for Pb2+, and CH > CCR > PP > CP for Ni2+. The adsorption mechanism was found to be controlled by ion exchange and precipitation. These findings suggest that the dry raw biomasses of corn cob residues, cocoa husk, cassava, and plantain peels can effectively remove lead and nickel, but further research is needed to explore their application in industrial-scale and continuous systems.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of the Phmentioning

confidence: 99%