Removal and preconcentration of inorganic and methyl mercury from aqueous media using a sorbent prepared from the plant Coriandrum sativum

Karunasagar, D.; Krishna, M. Bala; Rao, Shodhan; Arunachalam, J.

doi:10.1016/j.jhazmat.2004.10.021

Cited by 82 publications

(37 citation statements)

References 18 publications

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“…Chitosan was immobilized on polysilicate matrix after slight modification in the method described by Karunasagar et al [27] in which sodium silicate was used as the immobilization matrix for the plant Coriandrum sativum. In the present study, the immobilization procedure was as follows: 6.0% (w/w) sodium silicate was added dropwise into 15.0 mL of 5.0% (v/v) H 2 SO 4 until pH rose to 2.…”

Section: Immobilization Of Chitosan On Sodium Silicatementioning

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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Section: Immobilization Of Chitosan On Sodium Silicatementioning

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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“…Plant wastes can be used as an adsorbent due to their free availability, inexpensive value, selective and good adsorption capacity. Untreated plant wastes have been used for the adsorption of pollutants (Saeed et al, 2005;Babarinde et al, 2006;King et al, 2006;Hanafiah et al, 2007;Hanafiah et al, 2006b;Hanafiah et al, 2006c;Karunasagar et al, 2005;Quek et al, 1998;Sawalha al., 2007b;Ho and Wang, 2004;Ho, 2003;Ho et al, 2004;Bhattacharya et al, 2006;Villaescusa et al, 2004). The adsorption capacity of plant wastes can be increased by pretreatment with certain modifying agents such as base solution of sodium hydroxide before being used for the sanitization and the chelating efficacy can be enhanced by this pretreatment (Gaballahet et al, 1997;Ngah and Hanafiah, 2008).…”

Section: Introductionmentioning

confidence: 99%

A comparative biosorption study of sulfide (S-2) by using Lagenaria siceraria fruit based raw biosorbent

Dar¹,

Dar²,

Ahmed³

et al. 2017

Bangladesh J. Sci. Ind. Res.

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In batch mode, the adsorption characteristics of S 2¯i ons on Lagenaria siceraria mesocarp, pedicle and peel as raw materials have been studied in comparison to remove sulfide ions from tanneries waste water, under various parameters such as adsorbent dosage, contact time, agitation speed and pH. Maximum removal efficiency (70.96%) was observed on L. Siceraria peel followed by pedicle (51.58%) and mesocarp (29.57%) for adsorbent dosage of 0.10 g/L peel for 50 ml solution of sulfide (20 mg/L). The adsorption process was rapid, and it reached equilibrium in early 20-35 min for all adsorbents. Freundlich and Langmuir adsorption isotherms were employed for mathematical description of the adsorption equilibrium and to explain mechanism of adsorption.The maximum amounts of sulfide ions adsorbed, as evaluated by Langmuir isotherm, was 1.0436 mg/g of LS pedicle, 0.886 mg/g of peel and 0.843 mg/g of pedicle. The adsorption process conforms well to a pseudo second order kinetic model with best adsorption results at pH 8.

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“…7,8 Its toxicity depends on its chemical forms; organic mercury compounds are generally much more toxic than inorganic mercury due to their strong lipophilic characteristics. [7][8][9][10] Hence, speciation analysis of mercury ion (Hg 2+ ) and its organic species is being increasingly investigated because the monitoring and remediation of heavy metal pollution has become a crucial global issue. The speciation and determination of mercury species is generally performed using chromatographic techniques, such as gas chromatography (GC), liquid chromatography (LC), ion chromatography (IC) and capillary electrophoresis (CE) for separation, 5,6,8,11 which are oen coupled with element selective detectors, e.g.…”

Section: Introductionmentioning

confidence: 99%

Hg²⁺ion-imprinted polymers sorbents based on dithizone–Hg²⁺chelation for mercury speciation analysis in environmental and biological samples

Zhong

Song

et al. 2014

RSC Adv.

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For mercury speciation analysis in environmental and biological samples, novel Hg 2+ ion-imprinted polymers (IIPs) were synthesized by a sol-gel process using the chelating agent dithizone, and then dithizone-Hg 2+ chelate as a template and 3-aminopropyltriethoxysilane as a functional monomer, followed by solid-phase extraction (SPE) and atomic fluorescence spectroscopy (AFS) detection. The resultant Hg-IIPs offered high binding capacity, fast kinetics, and their adsorption processes followed aLangmuir isotherm and pseudo-second-order kinetic models. The IIPs displayed excellent selectivity . Furthermore, the analytical results for the spiked mercury species in real biological samples, such as human hair and fish meat, confirmed that the methods are practically applicable to speciation analysis. The IIPs-SPE-AFS demonstrated significant application perspectives for rapid and high-effective cleanup, enrichment and determination of trace mercury species in complicated matrices.

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Removal and preconcentration of inorganic and methyl mercury from aqueous media using a sorbent prepared from the plant Coriandrum sativum

Cited by 82 publications

References 18 publications

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

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

A comparative biosorption study of sulfide (S-2) by using Lagenaria siceraria fruit based raw biosorbent

Hg²⁺ion-imprinted polymers sorbents based on dithizone–Hg²⁺chelation for mercury speciation analysis in environmental and biological samples

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Removal and preconcentration of inorganic and methyl mercury from aqueous media using a sorbent prepared from the plant Coriandrum sativum

Cited by 82 publications

References 18 publications

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

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

A comparative biosorption study of sulfide (S-2) by using Lagenaria siceraria fruit based raw biosorbent

Hg2+ion-imprinted polymers sorbents based on dithizone–Hg2+chelation for mercury speciation analysis in environmental and biological samples

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Product

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Hg²⁺ion-imprinted polymers sorbents based on dithizone–Hg²⁺chelation for mercury speciation analysis in environmental and biological samples