Sorption recovery of metal ions using silica gel modified with salicylaldoxime

Sarkar, Asit R.; Datta, Pradip; Sarkar, Mitali

doi:10.1016/0039-9140(96)01953-4

Cited by 111 publications

(52 citation statements)

References 16 publications

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“…Precipitation of metal ions becomes significant at approximately pH 7.0 for all metal ions. [28][29][30] The theoretical and experimental precipitation curves indicate that precipitation begins above this pH, and may also depend on the concentration of metal ions in the adsorption medium. Therefore, in our study, in order to establish the effect of pH on the adsorption of metal ions onto the chelating beads, we repeated the batch equilibrium studies at different pHs within the range 3.0-7.0.…”

Section: Effect Of Ph On Metal Bindingmentioning

confidence: 95%

Novel methacryloylamidophenylalanine functionalized porous chelating beads for adsorption of heavy metal ions

et al. 2003

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ABSTRACT:The purpose of this study was to investigate in detail the adsorption performance of poly(2-hydroxyethylmethacrylatemethacryloylamidophenylalanine) [p(HEMA-MAPA)] beads. The metal-complexing comonomer MAPA was synthesized by reacting methacryloyl chloride with phenylalanine. Spherical beads with an average size of 150-200 m were obtained by radical suspension polymerization of HEMA and MAPA, conducted in an aqueous dispersion medium. The beads had a specific surface ADSORPTION OF HEAVY METAL IONSarea of 19.1 m 2 /g, and were characterized by means of swelling studies, FTIR, and elemental analysis. Beads with a swelling ratio of 68% and containing 3.2 mmol MAPA/g were used for the removal of heavy metal ions. Adsorption experiments were conducted with the MAPA-functionalized beads involving the heavy metal ions cadmium, arsenic, chromium, mercury, and lead. Metal adsorption was found to be dependent on the characteristics of the solution (i.e., medium pH and metal concentration) and the type of metals to be adsorbed. We have obtained adsorption capacities equal to 669.4 mg/g for Hg(II), 584.4 mg/g for Pb(II), 268.4 mg/g for Cd(II), 204.1 mg/g for As(III), and 115.2 mg/g for Cr(III). The adsorption capacities on molar basis were in the order of Hg(II) > Pb(II) > Cd(II) > As(III) > Cr(III). Adsorption of heavy metal ions from synthetic wastewater was also studied. The adsorption capacities were 24.5 mg/g for Cd(II), 16.9 mg/g for Cr(III), 144.4 mg/g for Hg(II), 90.9 mg/g for Pb(II), and 8.0 mg/g for As(III) at 0.5 mmol/l initial metal concentration. Naturally, depending on the desired goals, the beads containing metal could be regenerated for appropriate disposal. Our results suggest that p(HEMA-MAPA) beads are good metal adsorbers and have a great potential for environmental protection.

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Section: Effect Of Ph On Metal Bindingmentioning

confidence: 95%

Novel methacryloylamidophenylalanine functionalized porous chelating beads for adsorption of heavy metal ions

et al. 2003

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“…Among wide range of solid adsorbents, such as chelating resins, silica gel, carbon sorbents, inorganic based sorbents, biological adsorption material and nanomaterials [5,[15][16][17][18], silica gel bonded chelating ligands has gained much more importance for metal ion enrichment for its definite advantages, such as good mechanical strength, no swelling and straining, good thermal stability and convenient chemical modification [19].…”

Section: Introductionmentioning

confidence: 99%

Polyelectrolyte Modified Silica Gel Micro-Column Solid Phase Extraction for the Determination of Silver in Environmental Water Samples by Flame Atomic Absorption Spectrometry

Xiang

Jiang

et al. 2013

J. Chil. Chem. Soc.

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Silica gel was chemically modified with polyelectrolyte and used as a solid phase extraction adsorbent for the determination of trace silver in environmental water samples by flame absorption spectrometry (FAAS). The effects of pH, sample flow rate and volume, elution conditions and co-existing ions on the recovery of the analyte were investigated. The results showed that silver could be adsorbed at pH 5.0 and eluted by 5.0 mL 2% thiourea in HNO 3 (0.1 mol L -1 ). Under the optimized conditions, the adsorption capacity of modified silica gel was found to be 8.6 mg g -1 for silver. The detection limit of the proposed method was 1.0 ng mL -1 for silver with an enrichment factor of 18.7. The analytical result for the certified reference water sample (GBW08610) was in a good agreement with the certified value. The proposed method has also been successfully applied to the determination of trace silver in drinking water, well water, snow water and waste water with the recoveries for spiked samples between 94% and 105%.

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“…[23][24][25][26][27][28][29][30][31][32][33] The efficiency of unmodified silica gel to act as a solid-phase extractor for the removal, separation and preconcentration of heavy metal ions is very low due to the weak interaction between these metal ions and surface silanol groups. 34,35 Thus, the modification of a silica-gel surface through the immobilization of organic complexing agents, either chemically [36][37][38] or physically, [39][40][41][42] Two new silica-gel phases were produced directly via the chemical interaction of 3-chloropropyltrimethoxysilane modified silica gel with 8-aminoquioline, phase I and 2-aminopyridine, phase II under reflux conditions. The selectivity properties exhibited by the phases under investigation for the uptake of Ca(II), Mg(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Pb(II) were determined at different pH values and shaking times under static conditions.…”

Section: Introductionmentioning

confidence: 99%

Solid-Phase Extractors Based on 8-Aminoquinoline and 2-Aminopyridine Covalently Bonded to Silica Gel for the Selective Separation and Determination of Calcium in Natural Water and Pharmaceutical Samples

Soliman¹,

Ahmed

2010

ANAL. SCI.

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Sorption recovery of metal ions using silica gel modified with salicylaldoxime

Cited by 111 publications

References 16 publications

Novel methacryloylamidophenylalanine functionalized porous chelating beads for adsorption of heavy metal ions

Novel methacryloylamidophenylalanine functionalized porous chelating beads for adsorption of heavy metal ions

Polyelectrolyte Modified Silica Gel Micro-Column Solid Phase Extraction for the Determination of Silver in Environmental Water Samples by Flame Atomic Absorption Spectrometry

Solid-Phase Extractors Based on 8-Aminoquinoline and 2-Aminopyridine Covalently Bonded to Silica Gel for the Selective Separation and Determination of Calcium in Natural Water and Pharmaceutical Samples

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