Competitive Adsorption in Binary Solution with Different Mole Ratio of Sr and Cs by Zeolite A : Adsorption Isotherm and Kinetics

이창한,; 박정민,; 이민규,

doi:10.5322/jesi.2015.24.2.151

Cited by 11 publications

(3 citation statements)

References 24 publications

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“…Under the mixed condition, lower k values were obtained for both Cu(II) and phosphate compared with those under single conditions, except for Cu(II) in the PFO model, which can be disregarded because the PSO model afforded a better R 2 than the PFO model. The lower k values can be attributed to the competition between co-ions regardless of their individual adsorption capacity [ 38 , 39 ]. Under the mixed condition, the adsorption rate for Cu(II) and phosphate were reduced to −28.9 and −76.2, and to −32.1 and −71.3 for nonlinear and linear PSO models, respectively.…”

Section: Resultsmentioning

confidence: 99%

Adsorption Characteristics for Cu(II) and Phosphate in Chitosan Beads under Single and Mixed Conditions

Kim

Shin

2023

Polymers

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Chitosan, a natural organic polymer, has shown bifunctional characteristics in the removal of cationic and anionic contaminants from water and wastewater treatment. In particular, cationic Cu(II) and anionic phosphate can simultaneously interact with chitosan owing to the presence of the amino group in the form of NH2 and NH3+ in chitosan. To gain greater insight into the bifunctional adsorption characteristics of chitosan, its adsorption capacity for Cu(II) and phosphate was tested under single and mixed (co-ion) conditions to investigate the interactions between four types of chitosan beads and NH2 and NH3+. In the single condition, Cu(II) uptake was reduced from 0.243 to 0.0197 mmol/g due to the crosslinking and drying processes, whereas no significant reduction in phosphate uptake was observed, indicating that the crosslinking agent only interacted with NH2 to decrease the number of available adsorption sites for Cu(II). Under the mixed condition, the simultaneous presence of the two ions clearly increased the uptake of each other, with the adsorption of phosphate being more influenced than that of Cu(II). The comparison of the rate constant, k1 or k2, using pseudo-first- and pseudo-second-order models confirmed that phosphate reached equilibrium faster than Cu(II), suggesting that electrostatic interaction was preferred over coordination. In addition, under mixed conditions, co-ion competition slowed down the adsorption kinetics for both Cu(II) and phosphate.

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Section: Resultsmentioning

confidence: 99%

Adsorption Characteristics for Cu(II) and Phosphate in Chitosan Beads under Single and Mixed Conditions

Kim

Shin

2023

Polymers

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“…Lee et al . 8 evaluated the adsorption performance of valuable metal ions (Cu, Co, Mn, and Zn) using a synthesized zeolite (Z-C2) from fly ash.…”

Section: Introductionmentioning

confidence: 99%

“…6 NJ zeolite (natural Jordanian zeolite)20242225.914.3Taamneh and Sharadqah s Z-C2 (synthesized zeolite from fly ash)143077.794.757.751.1Lee et al . 8 …”

Section: Introductionmentioning

confidence: 99%

Performance of composite mineral adsorbents for removing Cu, Cd, and Pb ions from polluted water

Lim

Kim²,

Lee

et al. 2019

Sci Rep

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This study evaluated the efficiency of the removal of heavy metals from contaminated water via adsorption isotherm and kinetic experiments on two composite mineral adsorbents, CMA1 and CMA2. The developed CMA1 (zeolite with clinoptilolite of over 20 weight percent and feldspar of ~10 percent, with Portland cement) and CMA2 (zeolite with feldspar of over 15 weight percent and ~9 percent clinoptilolite, with Portland cement) were applied to remove Cu, Cd, and Pb ions. Based on the adsorption isotherm and kinetic experiments, the adsorbents CMA1 and CMA2 exhibited high removal efficiency for Cu, Cd, and Pb ions in solution compared to other adsorbents. In the adsorption kinetic experiment, CMA2 demonstrated better adsorption than CMA1 with the same initial concentration and reaction time, and Cu, Cd, and Pb ions almost reached equilibrium within 180 min for both CMA1 and CMA2. The results of the adsorption kinetic experiments with pseudo-first-order (PFO) and pseudo-second-order (PSO) models indicated that the PSO model was more suitable than the PFO model. Comparing the Langmuir and Freundlich adsorption isotherm models, the former showed a very slightly higher correlation coefficient (r2) than the latter, indicating that the two models can both be applied to heavy metal solutions on a spherical monolayer surface with a weak heterogeneity of the surface. Additionally, the adsorbents CMA1 and CMA2 demonstrated different removal abilities depending on which heavy metals were used.

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Possibilities of using silicate rock powder: An overview

Ramos

Hower

Blanco

et al. 2022

Geoscience Frontiers

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Competitive Adsorption in Binary Solution with Different Mole Ratio of Sr and Cs by Zeolite A : Adsorption Isotherm and Kinetics

Cited by 11 publications

References 24 publications

Adsorption Characteristics for Cu(II) and Phosphate in Chitosan Beads under Single and Mixed Conditions

Adsorption Characteristics for Cu(II) and Phosphate in Chitosan Beads under Single and Mixed Conditions

Performance of composite mineral adsorbents for removing Cu, Cd, and Pb ions from polluted water

Possibilities of using silicate rock powder: An overview

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