Arsenate removal from aqueous solution by cellulose-carbonated hydroxyapatite nanocomposites

Islam, Mahamudur; Mishra, Prakash Chandra; Patel, Raj Kishore

doi:10.1016/j.jhazmat.2011.03.051

Cited by 68 publications

(23 citation statements)

References 61 publications

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“…Tz= temperature of endothermic peak, T"z= temperature of exothermic peak. For all the composites CMC-HT2.2%, CMC-HT2.5% and CMC-HT3.5%, we observed the disappearance of the endothermic peak towards 400°C corresponding to the departure of water molecules, by dehydroxylation, and of carbonates of Hydrotalcite, which lets think that these species are more related to the synthesized nanomaterial.The two exothermic peaks obtained on the thermograms of CMC-HT2.2%, CMC-HT2.5% and CMC-HT3.5% (Fig.4b), correspond to the decomposition of cellulose in the composite, as was observed by Islam et al [12] for the cellulose-Hydroxypatite carbonated nanocomposite.This degradation occurs at lower temperatures than those obtained for cellulose alone.The addition of the clay particles altered the structure of cellulose in agreement with our observations by XRD (disappearance of the amorphous phase) and thus it is possible that this modification of the cellulose structure causes the modification of degradation temperature in the nanocomposite or it is due to the state of dispersion of hydrotalcite particles in the polymer.…”

Section: Thermal Studysupporting

confidence: 73%

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Effect of the Mg/Al ratio and of the rate of reinforcement on the synthesis of a nanocomposite Cellulose/Hydrotalcite

Bennani

2014

JAC

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The objective of this work is to synthesize a nonmaterial by introducing synthetic clay (hydrotalcite) as a nanofiller in a natural polymer matrix (cellulose) and to study the effect of Mg/Al ratio and the rates of reinforcement.Cellulose fibers were extracted from "Yucca" tree"s leaves by a chemical treatment and Hydrotalcite (MgAlCO3) was synthesized by the method of co-precipitation at fixed pH with a ratio of Mg/Al=2 or 3.The composite materials were elaborated by microwave activation.The Hydrotalcites with an Mg/Al ratio = 2 or 3 were tested as well as various rates of reinforcement (2, 5 or 10% Hydrotalcite) in order to optimize conditions of obtaining a nanomaterial.The structures of obtained materials were characterized by IR spectroscopy, X-ray Diffraction and Transmission Electron Microscopy. The thermal stability was analyzed by TG-DTA analyses.The characterizations carried out on these compounds revealed structural modifications in agreement with the formation of a nanomaterial (cellulose/Hydrotalcite) with the improved thermal properties.

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Section: Thermal Studysupporting

confidence: 73%

“…Delhom et al [11] have studied the development of nanocomposite containing coton cellulosemontmorillonite clay for the use as a retarding flame material. Islam et al [12] have synthesized cellulose-carbonated Hydroxyapatite nanocomposites for the retention of arsenic.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Mg/Al ratio and of the rate of reinforcement on the synthesis of a nanocomposite Cellulose/Hydrotalcite

Bennani

2014

JAC

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“…As(III) is oxidized to As(V) by an oxidizing agent such as chlorine or permanganate in most arsenic treatment processes [79,89]. Adsorbents like iron-based and iron minerals are characterized by their point of zero charges at a certain pH, where the mineral surface charge is equal to zero [42,50,84]. However, in other adsorbents, the strong adsorption of arsenic at pH > pHpzc indicates that the adsorption process is influenced by surface complexation and not electrostatic interaction [86].…”

Section: Effects Of Ph On Arsenic Removalmentioning

confidence: 99%

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

John

David

Mmereki

2018

International Journal of Chemical Engineering

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This paper presents a comparative review of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) for a better understanding of the conditions and factors during their adsorption with focus on (i) the isotherm adsorption models, (ii) effects of pH, (iii) effects of ionic strength, and (iv) effects of coexisting substances such as anions, cations, and natural organics matter. It provides an indepth analysis of various methods of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) removal by adsorption and the anions' characteristics during the adsorption process. The surface area of the adsorbents does not contribute to the adsorption capacity of these anions but rather a combination of other physical and chemical properties. The adsorption capacity for the anions depends on the combination of all the factors: pH, ionic strength, coexisting substances, pore volume and particles size, surface modification, pretreatment of the adsorbents, and so forth. Extreme higher adsorption capacity can be obtained by the modification of the adsorbents. In general, pH has a greater influence on adsorption capacity at large, since it affects the ionic strength, coexisting anions such as bicarbonate, sulfate, and silica, the surface charges of the adsorbents, and the ionic species which can be present in the solution.

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“…The adsorption kinetics of Cd and Cu on imogolite was analyzed using the PFO, PSO, Elovich equation, and intraparticle diffusion models [42,44,50,51,[54][55][56][57][58].…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Effect of cations in the background electrolyte on the adsorption kinetics of copper and cadmium and the isoelectric point of imogolite

Arancibia‐Miranda

Silva-Yumi²,

Escudey

2015

Journal of Hazardous Materials

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Arsenate removal from aqueous solution by cellulose-carbonated hydroxyapatite nanocomposites

Cited by 68 publications

References 61 publications

Effect of the Mg/Al ratio and of the rate of reinforcement on the synthesis of a nanocomposite Cellulose/Hydrotalcite

Effect of the Mg/Al ratio and of the rate of reinforcement on the synthesis of a nanocomposite Cellulose/Hydrotalcite

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

Effect of cations in the background electrolyte on the adsorption kinetics of copper and cadmium and the isoelectric point of imogolite

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