Removal of arsenic (III) and arsenic (V) from aqueous medium using chitosan-coated biosorbent

Boddu, Veera M.; Krishnaiah, A.; Talbott, Jonathan L.; Smith, Edgar D.; Haasch, Richard T.

doi:10.1016/j.watres.2007.08.014

Cited by 464 publications

(216 citation statements)

References 38 publications

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“…However, most of the removal techniques whether conventional or advanced suffer from different shortcomings especially in the developing globe. This is due high energy requirements, cost unaffordability, and large quantities of sludge production that again needs safest disposal, fouling through the way of implementation, requirement of skilled labor, extensive pretreatment and prone to chemical hazardous [11][12][13][14][15][16]. Among several treatment technologies applied for fluoride removal, adsorption process has been explored widely and offers satisfactory results.…”

Section: Introductionmentioning

confidence: 99%

Defluoridation of Water Using Natural and Activated Coal

Regassa¹,

Melak²,

Birke³

et al. 2016

International Advanced Research Journal in Science, Engineering

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High fluoride concentration is a worldwide problem in drinking water due its health effects. Batch mode investigation to remove fluoride from aqueous solution and real groundwater samples by natural coal and its modified forms was made. The physicochemical analysis of adsorbents and their activation was overseen to well understand the mechanism of sorption. Adsorption was found to be pH dependent with optimal removal efficiency at pH 2 for physically and chemically activated coal and at pH 4 for natural coal (NC). The experimental data was well fitted with Langmuir and Freundlich adsorption model providing maximum adsorption capacity of 5.9, 8.36 and 11.35 mg/g for natural, physical and chemical activated coal in their order written from Langmuir model. The Dubinin-Radushkevich isotherm (R 2 = 0.988) with mean free energy (E = 0.085 KJ/mol) for natural coal signify physiosorption should be mainly responsible for fluoride adsorption. The applicability of the adsorbents from fluoride contaminated groundwater indicated that natural coal (NC), physically activated coal (PAC) and chemically activated coal (CAC) can be used as an effective, low-cost adsorbent to remove fluoride from groundwater. The buffering capacity of adsorbents monitored during sorption induces a pH increase to nearly neutral, after sorption, which may be an important asset in real applications.

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Section: Introductionmentioning

confidence: 99%

Defluoridation of Water Using Natural and Activated Coal

Regassa¹,

Melak²,

Birke³

et al. 2016

International Advanced Research Journal in Science, Engineering

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“…As(III) is more difficult to be removed from water than As(V) because of the lack of electrostatic attraction on the solid. Commonly used processes for arsenic removal include oxidation and sedimentation, coagulation and filtration, lime treatment, adsorption onto sorptive media, ion exchange and membrane filtration (Wang et al, 2003;Berg et al, 2006;Jang et al, 2006;Boddu et al, 2008). The major disadvantage of these techniques is that they are unable to removal As(III) efficiently.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of arsenite and fluoride via an integrated electro-oxidation and electrocoagulation process

et al. 2011

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a b s t r a c tAn integrated electro-oxidation and electrocoagulation system was designed and used to remove As(III) and F À ions from water simultaneously. Dimensionally stable anodes (DSA), Fe electrodes, and Al electrodes were combined into an electrochemical system. Two pieces of DSA electrodes were assigned as the outside of the Fe and Al electrodes and were directly connected to the power supply as anode and cathode, respectively. The Fe and Al ions were generated by electro-induced process simultaneously. Subsequently, hydroxides of Fe and Al were formed. Arsenic ions are mainly removed by iron hydroxides and F À ions are mainly removed by the Al oxides. At the initial concentration of 1.0 mg L À1 , most of As(III) was transferred into As(V) within 40 min at current density of 4 mA cm À2 , whereas F À ions can be efficiently removed simultaneously. The effect of the ratio of Fe and Al plate electrodes and current density on the removal of As(III) and F À was investigated. With one piece of Fe plate electrode and three pieces of Al plate electrodes, it is observed that As(III) with concentration of 1 mg L À1 and F À with concentration of 4.5 mg L À1 can be removed and their final concentrations were below the values of 10 lg L À1 and 1.0 mg L À1 , respectively within 40 min. Removal efficiency of As(III) increases with the increase of solution pH. However, in the pH range of 6-7, removal efficiency of F À is the largest.

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“…Chitosan was also used as a resin for arsenic sorption in column studies with improved resistance to shrinkage which was obtained by cross-linked chitosan functionalized with 3,4-diamino benzoic acid [17]. Boddu et al used ceramic alumina dip-coated with chitosan for As(III) and As(V) removal in column and an improved sorption capacity was reported for As(III) [18].…”

Section: Introductionmentioning

confidence: 99%

Sorption of As(V) from waters using chitosan and chitosan-immobilized sodium silicate prior to atomic spectrometric determination

Boyacı

Eroğlu

Shahwan

2010

Talanta

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Keywords:As(V) As(III) Sorption Chitosan Chitosan-immobilized sodium silicate a b s t r a c t A natural biosorbent containing amine functional groups, chitosan, and a novel sorbent, chitosanimmobilized sodium silicate, were prepared and utilized for the selective sorption of As(V) from waters prior to its determination by atomic spectrometric techniques, namely, hydride generation atomic absorption spectrometry (HGAAS) and inductively coupled plasma mass spectrometry (ICP-MS). Chitosan was synthesized from chitin and sodium silicate was used as the immobilization matrix due to its straightforward synthesis. Through sequential sorption studies, it was shown that chitosan-immobilized sodium silicate has exhibited a better chemical stability than the chitosan itself which demonstrates the advantage of immobilization method. Both chitosan and chitosan-immobilized sodium silicate were shown to selectively adsorb As(V), arsenate, from waters at pH 3.0 at which neither chitin nor sodium silicate displayed any sorption towards As(V). The sorption of arsenate by chitosan is supposed to have electrostatic nature since pH of 3.0 is both the point at which the amino groups in chitosan are protonated and also the predominant form of As(V) is H 2 AsO 4 − . A pre-oxidation step is required if both As(III) and As(V) are to be determined. Desorption from the sorbents was realized with 1.0% (w/v) l-cysteine prepared in a pH 3.0 solution adjusted with HCl. Among the possible interfering species tested, only Te(IV) and Sb(III) were shown to cause a decrease in the sorption capacity especially at high interferant concentrations. High concentrations of Sb(III) also resulted in gas phase interference during hydride generation.The validity of the method was checked both via spike recovery experiments and also through the analysis of a standard reference material. Spike recovery tests were carried out with four different types of water; namely, ultra-pure, bottled drinking, tap, and sea water; and percent recovery values were found to be 114 (±4), 112 (±2), 43 (±4), and 0 (±1), respectively. It was concluded that the proposed methodology can be applied efficiently to low-to-medium ionic strength solutions, such as most drinking waters. The accuracy of the method was additionally investigated through the analysis of a standard reference material and a good correlation was found between the determined (26.6 ± 2.4 g L −1 ) and the certified (26.67 g L −1 ) value.

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Removal of arsenic (III) and arsenic (V) from aqueous medium using chitosan-coated biosorbent

Cited by 464 publications

References 38 publications

Defluoridation of Water Using Natural and Activated Coal

Defluoridation of Water Using Natural and Activated Coal

Simultaneous removal of arsenite and fluoride via an integrated electro-oxidation and electrocoagulation process

Sorption of As(V) from waters using chitosan and chitosan-immobilized sodium silicate prior to atomic spectrometric determination

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