Adsorption mechanism of Cu2+ from aqueous solution by chitosan-coated magnetic nanoparticles modified with α-ketoglutaric acid

Zhou, Yuting; Branford-White, Christopher; Nie, Huali; Zhu, Li‐Min

doi:10.1016/j.colsurfb.2009.07.026

Cited by 113 publications

(46 citation statements)

References 39 publications

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“…A new peak appeared aer Cu(II) adsorption, which is in agreement with Cu(II) standard data. 62 In addition, Ca(II) ions in MM were reduced obviously aer Cu(II) adsorption, which is in accordance with the result of SEM-EDS. Fig.…”

Section: Comparison With Other Adsorbentssupporting

confidence: 81%

Removal of Cu(ii) from aqueous solution using Fe₃O₄–alginate modified biochar microspheres

Wang

Dong

et al. 2017

RSC Adv.

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Magnetic microspheres (MM) were prepared using calcium alginate (CA) encapsulated biochar (BC) and with pseudo-second-order kinetics. The overall orders for fitting the isotherm models are Langmuir > Freundlich for Cu(II). Mechanism studies showed that coordination and ion exchange were the major mechanism for Cu(II) removal by the MM. Moreover, the presence of the magnetic particles in the microspheres allowed easy separation of the material from aqueous solutions. This study provides an effective method for biochar modification.

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Section: Comparison With Other Adsorbentssupporting

confidence: 81%

Removal of Cu(ii) from aqueous solution using Fe₃O₄–alginate modified biochar microspheres

Wang

Dong

et al. 2017

RSC Adv.

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“…It suggests that the rate-determining step for adsorption is chemical adsorption and that adsorption involves valence forces from sharing of electrons by the metal ions and adsorbents (Yu et al 2012;Bhattacharya et al 2008;Zhou et al 2011). MNS 1 , MNS 2 and MNS 3 have chelating functional groups on their surfaces that probably behave as chelating exchangers; therefore, a complexation reaction is expected for adsorption (Zhou et al 2009). Adsorption-desorption of the metal ions onto the adsorbents allow their use repeatedly for removal of copper and lead ions from aqueous solutions.…”

Section: Kinetics Of Adsorptionmentioning

confidence: 99%

Adsorption efficiency, thermodynamics and kinetics of Schiff base-modified nanoparticles for removal of heavy metals

Moftakhar

Yaftian

Ghorbanloo

2016

Int. J. Environ. Sci. Technol.

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Nanosilica particles modified by Schiff base ligands 3-methoxy salicylaldimine propyl triethoxysilane (MNS 1 ), 5-bromo salicylaldimine propyl triethoxysilane (MNS 2 ) and 3-hydroxy salicylaldimine propyl triethoxysilane (MNS 3 ) were prepared, and their potential for separation of copper, lead, zinc, cadmium, cobalt and nickel ions from aqueous solutions was examined. The effect of parameters influencing adsorption efficiency including aqueous-phase pH, amount of adsorbent, stirring time and initial concentration of the metal ions was assessed and discussed. Although MNS 1 and MNS 3 removed lead ions efficiently, all adsorbents showed strong selectivity toward copper ions. It was shown that, under some circumstances, MNS 3 decreased the amount of other ions, particularly cobalt, in the aqueous phase. The adsorbents were also applied for removal of copper and lead ions from real samples. Possible quantitative desorption of the metal ions loaded onto the adsorbents suggests their multiple uses in adsorption-desorption process. Investigation of temperature dependency of the process led to determination of the DH°, DS°and DG°values. This investigation indicates that the adsorption of copper ions onto the all studied adsorbents and lead ions onto MNS 1 and MNS 3 is endothermic. The Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms were tested to describe the equilibrium data. Pseudo-first-order, pseudo-secondorder, Elovich and intra-particle diffusion equations were applied to study the kinetics of copper and lead adsorption onto the modified nanoparticles. This investigation indicates that the process for all adsorbents follows pseudosecond-order kinetics and suggests a chemisorption mechanism for the adsorption processes by the studied adsorbents.

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“…[18][19][20][21][22][23][24][25][26][27] There are several examples of magnetic nanoparticles in aqueous solutions. [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] For example in A@B particles, A components of magnetite (Fe 3 O 4 ), [27][28][29][30][31][32][33][34][35][36][37][38] maghemite (g-Fe 2 O 3 ) [39][40][41][42][43][44][45] and FePt, 46 and B components of organic polymers, [31]…”

Section: 15-17mentioning

confidence: 99%

“…[27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] For example in A@B particles, A components of magnetite (Fe 3 O 4 ), [27][28][29][30][31][32][33][34][35][36][37][38] maghemite (g-Fe 2 O 3 ) [39][40][41][42][43][44][45] and FePt, 46 and B components of organic polymers, [31][32][33]42 amines, 34 acids, 35,36,43 cyclodextrins, 46 silica (organosilicas), [27][28][29]…”

Section: 15-17mentioning

confidence: 99%

Chemically stable magnetic nanoparticles for metal adsorption and solid acid catalysis in aqueous media

et al. 2014

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We have developed a magnetically collectable, reusable adsorbent and a catalyst for concentrating heavy metal ions in acidic aqueous solutions and solid acid catalysis in aqueous media. Chemically stable, magnetic rattle-type core-shell particles, comprising metallic cobalt nanoparticles in hollow silica microspheres, were prepared by the sol-gel reaction of alkylsilyl trichlorides around water droplets in a water-in-oil emulsion. Sulfonic groups were immobilized on the external surface of the core-shell particles through silylation with 3-mercaptopropyl(trimethoxysilane) and subsequent oxidization of the thiol groups by nitric acid. The sulfonic groups acted as adsorption sites for Zn and Pb ions under acidic conditions and as catalytically active sites for the hydrolysis of ethyl acetate in aqueous media. The enclosed Co was not eroded during the regeneration of the adsorbent/catalyst by 1 M HCl. The chemical stability arose from the dense non-porous shell, which prevents the passage of solvents.

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Adsorption mechanism of Cu2+ from aqueous solution by chitosan-coated magnetic nanoparticles modified with α-ketoglutaric acid

Cited by 113 publications

References 39 publications

Removal of Cu(ii) from aqueous solution using Fe₃O₄–alginate modified biochar microspheres

Removal of Cu(ii) from aqueous solution using Fe₃O₄–alginate modified biochar microspheres

Adsorption efficiency, thermodynamics and kinetics of Schiff base-modified nanoparticles for removal of heavy metals

Chemically stable magnetic nanoparticles for metal adsorption and solid acid catalysis in aqueous media

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Adsorption mechanism of Cu2+ from aqueous solution by chitosan-coated magnetic nanoparticles modified with α-ketoglutaric acid

Cited by 113 publications

References 39 publications

Removal of Cu(ii) from aqueous solution using Fe3O4–alginate modified biochar microspheres

Removal of Cu(ii) from aqueous solution using Fe3O4–alginate modified biochar microspheres

Adsorption efficiency, thermodynamics and kinetics of Schiff base-modified nanoparticles for removal of heavy metals

Chemically stable magnetic nanoparticles for metal adsorption and solid acid catalysis in aqueous media

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Removal of Cu(ii) from aqueous solution using Fe₃O₄–alginate modified biochar microspheres

Removal of Cu(ii) from aqueous solution using Fe₃O₄–alginate modified biochar microspheres