Preconcentration of gold ions from water samples by modified organo-nanoclay sorbent prior to flame atomic absorption spectrometry determination

Afzali, Daryoush; Mostafavi, Ali; Mirzaei, Mohammad

doi:10.1016/j.jhazmat.2010.05.106

Cited by 43 publications

(18 citation statements)

References 21 publications

(32 reference statements)

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“…Clay minerals are characterized as a layer structure with one dimension in the nanometer range; the thickness of the 1:1 layer is about 0.7 nm, while the 2:1 layer is about 1 nm (Afzali et al 2010). Clays are naturally existing aluminium silicate, principally consisting of fine-grained minerals with the natural structure of sheet-like geometry.…”

Section: Introductionmentioning

confidence: 99%

Chemical Modification of Oil Palm Mesocarp Fiber by Methacrylate Silane: Effects on Morphology, Mechanical, and Dynamic Mechanical Properties of Biodegradable Hybrid Composites

Eng¹,

Ibrahim²,

Zainuddin³

et al. 2015

BioResources

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Effects of modifying oil palm mesocarp fibers (OPMF) by methacrylate silane on polylactic acid (PLA)/ polycaprolactone (PCL)/clay/OPMF hybrid composites were investigated. The composites were prepared by a melt blending technique and characterized by dynamic mechanical analysis (DMA) and scanning electron microscopy (SEM). The silane-treated OPMF hybrid composites showed better tensile strength, tensile modulus, and elongation at break than unmodified OPMF hybrid composites. DMA analysis showed an increase in storage modulus when silane-treated OPMF was added to a hybrid composite. The loss modulus curve showed that the incorporation of silane-treated OPMF into a hybrid composite shifted the two glass transition temperatures (Tg) of composites closer to each other. The low tan δ peak indicated good fiber/matrix adhesion for the silane-treated OPMF hybrid composites. SEM micrographs revealed that silane-treated OPMF hybrid composites showed better fiber/matrix adhesion than unmodified OPMF hybrid composites because of absence of gap between silane-treated OPMF and the matrix in the composite.

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Section: Introductionmentioning

confidence: 99%

Chemical Modification of Oil Palm Mesocarp Fiber by Methacrylate Silane: Effects on Morphology, Mechanical, and Dynamic Mechanical Properties of Biodegradable Hybrid Composites

Eng¹,

Ibrahim²,

Zainuddin³

et al. 2015

BioResources

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“…In the viewpoint of simplicity, cleanness, low reagent, and organic consumption, SPE is most widely applied and is preferred to LLE [13]. Over the past few years, several adsorbents, such as activated carbon [14], silicagel [15], exfoliated graphite [16], carbon nanotubes [17], ion-imprinted polymers [18,19], modified organo-nanoclay [20,21], hydrogel [22], activated alumina [23], modified silica [24,25], and modified nanoalumina [26], have been used for the preconcentration of metal ions. Fe 3 O 4 nanoparticles (NPs) as an efficient class of adsorbent, are receiving increasing interest in recent years.…”

Section: Introductionmentioning

confidence: 99%

Ionic liquid-modified Fe3O4 nanoparticle combined with central composite design for rapid preconcentration and determination of palladium ions

Bayat

Shemirani

Beyki

et al. 2015

Desalination and Water Treatment

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In this work, magnetic Fe 3 O 4 nanoparticles (NPs) were synthesized by ultrasonic chemical co-precipitation method. Then hydrophobic ionic liquid (IL), as a green coating agent, was deposited on the surface of synthesized NPs in order to improve their extraction capability toward Pd(II) ions as diethyldithiocarbamate (DDTC) complex. Scanning electron microscopy, thermogravimetric analysis, X-ray diffraction (XRD), vibrating sample magnetometer (VSM), and Fourier transformed infrared (FTIR) techniques were used for characterization of the adsorbent. The adsorption rate was fast and the equilibrium time was achieved within 4 min due to the strong interaction of Pd-DDTC complex with the IL and the absence of internal diffusion resistance. The separation of the adsorbent from aqueous bulk was achieved after about 2 min by a magnet, so no centrifugation or filtration was required. The effective parameters such as pH, concentration of ligand, amount of adsorbent, and the extraction time were inspected by using a central composite design in order to identify the most important parameters and their interactions. Under optimum conditions, the detection limit was 0.82 ng mL −1 and the relative standard deviation (n = 10) was 2.8% for 100 ng mL −1 of Pd(II). The proposed method was applied for the preconcentration of Pd(II) from road dust, liver, and water samples, and it was found that the amounts of palladium ions in dust and liver samples were 104 and 8.7 ng mL −1 , respectively.

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“…2 The significance of developing accurate and dependable analytical procedures for gold determination is related to its increasing presence in the environment, biology, industry and to a growing interest in the elucidation of its role in living organisms and the impact on human health. [3][4][5] Gold could be used as a drug in the supervised therapy of arthritis and cancer in the form of different Au(I) and Au(III) compounds, or in radiotherapy of cancer in the form of radioactive isotope 198 Au. It may be also very toxic for human and animal organism and plants and accounts as a pollutant, 5 because of its inhibiting effect upon the activity of many enzymes and its preventing effect upon DNA separation.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5] Gold could be used as a drug in the supervised therapy of arthritis and cancer in the form of different Au(I) and Au(III) compounds, or in radiotherapy of cancer in the form of radioactive isotope 198 Au. It may be also very toxic for human and animal organism and plants and accounts as a pollutant, 5 because of its inhibiting effect upon the activity of many enzymes and its preventing effect upon DNA separation. 6 In natural samples, Au concentration is about 4 ng g -1 in basic rocks and 1 ng g -1 in soils.…”

Section: Introductionmentioning

confidence: 99%

Determination of Gold in Various Environment Samples by Flame Atomic Absorption Spectrometry Using Dispersive Liquid–Liquid Microextraction Sampling

Saçmacı¹,

Kartal²,

Kalkan³

2015

Croat. Chem. Acta

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Abstract.A new dispersive liquid-liquid microextraction separation/preconcentration procedure as a rapid sample-preparation technique is proposed for detection of ultra trace amounts of Au(III) in various media by flame atomic absorption spectrometry using 1,5-diphenyl-1,3,5-pentanetrione as chelating agent. Carbon tetrachloride and methanol were used as extraction and dispersive solvents, respectively. Various parameters that affect the extraction efficiency such as pH, centrifugation rate and time, chelating agent concentration and sampling volume on the recovery of Au(III) were investigated. Under optimum conditions, the enhancement factor of 750, relative standard deviation of 2.7 % and calibration graphs obtained in the concentration range of 0.04-5.6 μg L −1 for gold were obtained. The limit of detection was 1.1 ng L −1 . The accuracy of the method was performed by analysis of the certified reference material (CDN-PGMS-10). The developed method was applied successfully to the determination of gold in the catalytic converter, anode slime, ore and seawater samples. The results show that dispersive liquid-liquid microextraction procedure is sensitive, rapid, simple and safe for the separation/preconcentration of gold from complex sample media.

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Preconcentration of gold ions from water samples by modified organo-nanoclay sorbent prior to flame atomic absorption spectrometry determination

Cited by 43 publications

References 21 publications

Chemical Modification of Oil Palm Mesocarp Fiber by Methacrylate Silane: Effects on Morphology, Mechanical, and Dynamic Mechanical Properties of Biodegradable Hybrid Composites

Chemical Modification of Oil Palm Mesocarp Fiber by Methacrylate Silane: Effects on Morphology, Mechanical, and Dynamic Mechanical Properties of Biodegradable Hybrid Composites

Ionic liquid-modified Fe3O4 nanoparticle combined with central composite design for rapid preconcentration and determination of palladium ions

Determination of Gold in Various Environment Samples by Flame Atomic Absorption Spectrometry Using Dispersive Liquid–Liquid Microextraction Sampling

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