Nanogel and superparamagnetic nanocomposite based on sodium alginate for sorption of heavy metal ions

Lakouraj, Moslem Mansour; Mojerlou, Fatemeh; Zare‬, Ehsan Nazarzadeh

doi:10.1016/j.carbpol.2014.01.092

Cited by 200 publications

(64 citation statements)

References 29 publications

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“…A broad peak in the range of 2θ = 8-18° was observed only when ALG Les, ALG Les/MWCNT or ALG Les/MWCNT-OX were used as additive. This fact is due to semi-crystalline nature of sodium ALG, showing peaks at 2θ = 12.81°, 21.83°, 23.25°, 35.9° and 39.92° [43,44]. To gain a better understanding of the effect of ALG Les and MWCNTs on in vitro CaCO 3 obtained through GD and EC methods, a non-classical technique was conducted by direct automatic potentiometric titrations using PNCs essays at pH 9.0.…”

Section: Resultsmentioning

confidence: 99%

Effect of Alginate from Chilean Lessonia nigrescens and MWCNTs on CaCO3 Crystallization by Classical and Non-Classical Methods

et al. 2018

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Abstract:In our crystallization experiments, the influence of alginate from Chilean Lessonia nigrescens and functionalized multi-walled carbon nanotubes (MWCNTs) was tested through electrocrystallization (EC) and gas diffusion (GD) methods on the crystal growth of calcium carbonate (CaCO 3 ) and their possible stabilization of proto-structures in amorphous CaCO 3 (ACC) state through pre-nucleation clusters (PNC) essays with automatic potentiometric titrations were performed. CaCO 3 crystals obtained in the in vitro above-mentioned crystallization systems were characterized by scanning electron microscope (SEM), energy-dispersive X-ray spectrometry (EDS) and powder X-ray diffractometer (XRD). Our experimental findings showed that ALG and functionalized MWCNTs stabilized truncated and agglomerated vaterite-like particles through GD and EC methods. While, on the other hand, we obtained qualitative information about induction or inhibition of CaCO 3 nucleation that was provided by potentiometric titrations.

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Section: Resultsmentioning

confidence: 99%

Effect of Alginate from Chilean Lessonia nigrescens and MWCNTs on CaCO3 Crystallization by Classical and Non-Classical Methods

et al. 2018

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“…SA features formability, hydrophilicity, biocompatibility, biodegradability, and efficiency and exhibits high activity with the carbonyl and hydrogen groups on the chain [6]. However, the natural property of SA is unstable in several cases.SA preserved for long periods demonstrates severe thermal degradation and poor water resistance, thereby requiring modification [7,8].…”

Section: Introduction Lmentioning

confidence: 99%

Effective Adsorption of Pb(II) Ions by Gel Beads of Sodium Alginate and Polyethylene Glycol

Wu¹,

Gao²,

Ren³

et al. 2016

JRST

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Novel gel beads were prepared using sodium alginate and polyethylene glycol to remove Pb(II) ions from aqueous solutions. The biopolymeric beads were characterized through scanning electron microscopy and energy-dispersive spectroscopy analyses. Effects of experimental parameters including initial pH, adsorbent dosage, reaction temperature, contact time, and initial metal ion concentration were discussed. The adsorption of Pb(II) ions followed the pseudo-second-order kinetics and fitted the Freundlich adsorption isotherm. Thermodynamic study also suggested that the adsorption reaction was spontaneous and exothermic. Chemical adsorption was found to be the main mechanism of Pb adsorption. The fabricated biosorbent exhibits potential for removal of Pb(II) ions.

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“…Recently, Alg-supported nanocomposites and functionalized Alg materials were used for the removal of toxic ions from the aqueous solution. [14][15][16][17][18][19] However, Ca 21 ions crosslinked with Alg beads are unstable because of the replacement of Ca 21 ions with H 1 ions in acidic environment which decrease their performance. 20 To enhance the stability, adsorption capacity, and reusability, high-valence metal ions are used as crosslinking agents to design the biocomposite beads.…”

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confidence: 99%

Synthesis of alginate beads filled with nanohydroxyapatite: An efficient approach for fluoride sorption

Pandi

Viswanathan

2015

J of Applied Polymer Sci

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Nanohydroxyapatite (n-HAp) powder is a promising adsorbent material with high defluoridation capacity (DC); however, it causes pressure drop during field applications. To overcome such problems and utilize the advantages of n-HAp, it is aimed to prepare n-HAp in a usable bead form with the support of alginate (Alg) biopolymer. n-HApAlgLa composite beads were synthesized by introducing n-HAp powder in Alg polymeric gel, and the resulting solution was dropped into La 31 ions for crosslinking. Defluoridation experiments were carried out in batch mode to optimize various influencing parameters like contact time, pH, challenger anions, initial fluoride concentrations, and temperature. The beads were characterized using Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy with energy-dispersive X-ray analyzer analysis. The sorption process was explained using diverse isotherms and kinetic models. The values of thermodynamic parameters indicate that the nature of fluoride is spontaneous and endothermic in nature. In field studies, n-HApAlgLa beads reduce the fluoride concentration below the tolerance limit. The regeneration and reusability studies were proposed to effectively use the sorbent.

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Nanogel and superparamagnetic nanocomposite based on sodium alginate for sorption of heavy metal ions

Cited by 200 publications

References 29 publications

Effect of Alginate from Chilean Lessonia nigrescens and MWCNTs on CaCO3 Crystallization by Classical and Non-Classical Methods

Effect of Alginate from Chilean Lessonia nigrescens and MWCNTs on CaCO3 Crystallization by Classical and Non-Classical Methods

Effective Adsorption of Pb(II) Ions by Gel Beads of Sodium Alginate and Polyethylene Glycol

Synthesis of alginate beads filled with nanohydroxyapatite: An efficient approach for fluoride sorption

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