Specificity and affinity of multivalent ions adsorption to kaolinite surface

Doi, Andrew; Khosravi, Monireh; Ejtemaei, Majid; Nguyen, Tuan A.H.; Nguyen, Anh V.

doi:10.1016/j.clay.2020.105557

Cited by 37 publications

(12 citation statements)

References 41 publications

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“…If pH pzc > pH, the adsorption capacity might be reduced due to possible electrostatic repulsion between the positive change of magnetic biochar and the positive charge of cadmium ions. Figure 12b shows that after adsorption, the magnetic biochar changed toward the positive, indicating that the cadmium ions were efficiently adsorbed as inner-sphere surface complexes or cations that may neutralize the surface's negative charge [59,92].…”

Section: Effect Of Phmentioning

confidence: 99%

Pristine and Magnetic Kenaf Fiber Biochar for Cd2+ Adsorption from Aqueous Solution

Saeed

Harun

Sufian

et al. 2021

IJERPH

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Development of strategies for removing heavy metals from aquatic environments is in high demand. Cadmium is one of the most dangerous metals in the environment, even under extremely low quantities. In this study, kenaf and magnetic biochar composite were prepared for the adsorption of Cd2+. The synthesized biochar was characterized using (a vibrating-sample magnetometer VSM), Scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The adsorption batch study was carried out to investigate the influence of pH, kinetics, isotherm, and thermodynamics on Cd2+ adsorption. The characterization results demonstrated that the biochar contained iron particles that help in improving the textural properties (i.e., surface area and pore volume), increasing the number of oxygen-containing groups, and forming inner-sphere complexes with oxygen-containing groups. The adsorption study results show that optimum adsorption was achieved under pH 5–6. An increase in initial ion concentration and solution temperature resulted in increased adsorption capacity. Surface modification of biochar using iron oxide for imposing magnetic property allowed for easy separation by external magnet and regeneration. The magnetic biochar composite also showed a higher affinity to Cd2+ than the pristine biochar. The adsorption data fit well with the pseudo-second-order and the Langmuir isotherm, with the maximum adsorption capacity of 47.90 mg/g.

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Section: Effect Of Phmentioning

confidence: 99%

Pristine and Magnetic Kenaf Fiber Biochar for Cd2+ Adsorption from Aqueous Solution

Saeed

Harun

Sufian

et al. 2021

IJERPH

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“… The immobilization of different classes of pollutants by such sorbents depends significantly on the concentration, distribution, and accessibility of sorbent functional groups (FGs). Inorganic materials (such as sand, zeolites, and biochar) have very good kinetics of pollutant sorption, due to the availability of FGs, but have a relatively low sorption capacity relative to the required sorbent amount. − Organic sorbents, such as exchange ion resins, have high sorption capacity, due to the high number of FG, but low sorption kinetics because of the poor diffusion of heavy metal into their small pores. , Instead, nanosorbents have a faster sorption rate, due to the higher surface, but their very small sizes cause difficulties in handling and separation from aqueous media after usage …”

Section: Introductionmentioning

confidence: 99%

Removal and Separation of Heavy Metal Ions from Multicomponent Simulated Waters Using Silica/Polyethyleneimine Composite Microparticles

Bucătariu¹,

Ghiorghiță²,

Zaharia³

et al. 2020

ACS Appl. Mater. Interfaces

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Composite solid surfaces with high content of functional groups (FGs) are useful materials in different types of applications requiring stimuli-responsive “hard/soft” architectures, their improved properties rising from the combination of organic–inorganic parts. Among different types of weak polyelectrolytes, poly(ethyleneimine) (PEI) is of great interest in the construction of composite systems with thin layer-by-layer (LbL) organic films due to the large number of amino groups per unit mass of polymer. Herein, the spherical silica microparticles were modified with linear (L) or branched (B) PEI chains using LbL deposition of a copper complex (PEIL–Cu2+ or PEIB–Cu2+) and poly(acrylic acid) (PAA), glutaraldehyde selective cross-linking, followed by copper and PAA extraction from the multilayer. The newly formed silica/(PEIL)10 and silica/(PEIB)10 composites were used in batch and column sorption/desorption experiments of four heavy metal ions (Cu2+, Ni2+, Co2+, and Cd2+). In noncompetitive conditions ([FG]/Σ[M2+] > 9), all heavy metal ions were retained on composites, demonstrating the potential application of the prepared functional microparticles in surface water treatment. However, in competitive conditions ([FG]/Σ[M2+] < 9), only Cu2+ is sorbed in high amount (∼2.5 mmol·g–1 PEI) on composites, with simultaneous displacement of already sorbed ions, demonstrating the solid-phase extraction and chromatographic properties of the synthesized silica/(PEIL) n and silica/(PEIB) n composites.

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“…When Cs is adsorbed on the illite surface, it will combine with other alkali cations, and the overall selective order is Li + > Na + > K + > Rb + . However, the percentage of Cs assigned to inner-sphere complexes as determined by NMR is in the sequence Na + > K + > Rb + > Li + , which differs from the order of Cs selectivity, and the divergence grows as the molar fraction of Cs in solution decreases [82] . Surface charge properties of kaolinite are affected by divalent ion adsorption, and strong hydrating ions have a significant impact on dispersion pH.…”

Section: Simulation In Surface Hydration Characterization Of Clay Min...mentioning

confidence: 90%

Molecular simulation in surface hydration of clay minerals: a review of theory and applications

Min¹,

Wang²,

Liu³

et al. 2022

Miner Miner Mater

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Clay minerals, which are prevalent gangue minerals, are found in tailings and beneficiation effluent after the extraction of valuable minerals. The surface of clay mineral particles is easy to hydrate, which makes it the main factor restricting tailings separation and wastewater treatment. However, the microscopic mechanism of clay mineral particle surface hydration is not yet systematic. In recent years, with the development of molecular simulation theory and the improvement of computational efficiency, density functional theory (DFT) and molecular dynamics (MD) have gradually become a powerful tool for studying the surface hydration of clay mineral particles, which provides new insight into the interaction between the crystal structures of clay minerals and the interfacial interaction in surface hydration of clay mineral particles at the molecular or atomic levels. This article first reviews the basic theory of DFT and MD, then reviews the research progress on clay mineral surface hydration. From the perspective of molecular simulation, a comprehensive discussion of the clay mineral phase structure, the establishment of the supercell surface model, the clay-water interface interaction and the limitations of molecular simulation was conducted. Water molecules can adsorb with different mineral surfaces in slime water through hydrogen bond, which is the basis of surface hydration mechanism. The hydration layer is composed of three water layers with different densities, with a thickness of about 8-10 Å. Water and ions form hydrate cations, which are adsorbed on the surface of clay minerals, change the structure of water layer on the surface of minerals. This article ends with a brief discussion of conclusions and perspectives.

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Specificity and affinity of multivalent ions adsorption to kaolinite surface

Cited by 37 publications

References 41 publications

Pristine and Magnetic Kenaf Fiber Biochar for Cd2+ Adsorption from Aqueous Solution

Pristine and Magnetic Kenaf Fiber Biochar for Cd2+ Adsorption from Aqueous Solution

Removal and Separation of Heavy Metal Ions from Multicomponent Simulated Waters Using Silica/Polyethyleneimine Composite Microparticles

Molecular simulation in surface hydration of clay minerals: a review of theory and applications

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