Chemically bonded multiwalled carbon nanotubes as efficient material for solid phase extraction of some metal ions in food samples

Ghaedi, Mehrorang; Montazerozohori, Morteza; Biyareh, Mehdi Nejati; Mortazavi, K.; Soylak, Mustafa

doi:10.1080/03067319.2011.629351

Cited by 57 publications

(10 citation statements)

References 59 publications

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“…The pre-concentration of MB on ACLP was conducted according to the following method (Ghaedi et al, 2013). The pH of the analyte was adjusted to pH 4 using 0.1 M H 2 SO 4 and NaOH.…”

Section: Pre-concentration Proceduresmentioning

confidence: 99%

Characterization and optimization of effluent dye removal using a new low cost adsorbent: Equilibrium, kinetics and thermodynamic study

Ezechi

Kutty

Malakahmad

et al. 2015

Process Safety and Environmental Protection

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“…The pre-concentration of MB on ACLP was conducted according to the following method (Ghaedi et al, 2013). The pH of the analyte was adjusted to pH 4 using 0.1 M H 2 SO 4 and NaOH.…”

Section: Pre-concentration Proceduresmentioning

confidence: 99%

Characterization and optimization of effluent dye removal using a new low cost adsorbent: Equilibrium, kinetics and thermodynamic study

Ezechi

Kutty

Malakahmad

et al. 2015

Process Safety and Environmental Protection

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“…Oxidization, activation and purification of MWCNTs were carried out according to our previous publication 34,35 . In order to activate, MWCNTs was suspended in 10% (v/v) hydrochloric acid (HCl) while stirring for 2 h. The treated MWCNTs were filtered and dried at 80°C for 5 h. Then for the oxidation of MWCNTs, 1 g of activated MWCNTs was added into 250 mL of 32.5% (w/v) nitric acid (HNO 3 ) solution and stirred for 36 h at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Functionalization of multiwalled carbon nanotubes for the solid-phase extraction of silver, cadmium, palladium, zinc, manganese and copper by flame atomic absorption spectrometry

et al. 2013

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In the present work, multiwalled carbon nanotube (MWCNT) chemically modified with (3-mercaptopropyl) silanetriolate is efficiently used for the solid-phase extraction of Cu(2+), Ag(+), Cd(2+), Pb(2+), Zn(2+) and Mn(2+) ions prior to their flame atomic absorption spectrometric determination. The influences of the various analytical parameters, including pH, amounts of solid phase, sample volume and eluent conditions and so on, on the recoveries of target analytes were investigated and optimized by one at a time optimization method. The influences of alkaline, alkaline earth and some transition metals on the adsorption and elution of the analytes were also examined. The detection limits for all understudied metal ions were between 1.4 and 2.8 ng mL(-1) (3Sb, n = 10). The evaluation of the thermodynamic parameters such as enthalpy (positive value), Gibbs free energy (negative value) in addition to high value of entropy shows the endothermic and spontaneous nature of sorption process. Following the optimization of variables, the adsorption process follows the intraparticle kinetic model with R (2) of 0.98 and the Langmuir isotherm with high correlation coefficient (R (2) > 0.95). The procedure was applied for the analytes determination in the food samples with satisfactory results (recoveries >95% and relative standard deviation's (RSD) lower than 4%).

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“…For maintain pH 0.01 M HCl and 0.01 M NaOH solutions were used. Point zero charge is a useful factor in sorption studies that allows one to hypothesize on the ionization of functional groups and their interactions with adsorbates [38]. The pH of zero net proton charge is defined here as the pH value at which the net surface charges is equal to zero.…”

Section: Effect Of Initial Solution Phmentioning

confidence: 99%

CuFe2O4@graphene nanocomposite as a sorbent for removal of alizarine yellow azo dye from aqueous solutions

Hashemian

Rahimi

Kerdegari

2016

Desalination and Water Treatment

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CuFe 2 O 4 @graphene nanocomposite was synthesized by chemical co-precipitation method. The nanocomposite was characterized by Fourier infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Adsorption of alizarine yellow (AY) by graphene, CuFe 2 O 4 , and CuFe 2 O 4 @graphene nanocomposite was studied. Effect of different factors including agitation time, pH, and adsorbate concentration on the adsorption capacity of adsorbent for AY dye was investigated. Experimental results demonstrated that AY could be effectively removed from aqueous solution by CuFe 2 O 4 @graphene nanocomposite within 40 min of contact time and pH 3. Two common kinetic models, pseudo-first order and pseudo-second order, were employed to describe the adsorption kinetics. The results indicated that the adsorption kinetics of AY well matched with pseudosecond-order rate expression. The equilibrium adsorption was best described by the Langmuir isotherm model. Various thermodynamic parameters such as the Gibbs free energy (ΔG˚), enthalpy (ΔH˚), and entropy (ΔS˚) change were also evaluated. Thermodynamic results revealed that the adsorption of AY onto CuFe 2 O 4 @graphene is endothermic, spontaneously process and feasible in the range of 303-333 K. The adsorption capacity of CuFe 2 O 4 , graphene, and CuFe 2 O 4 @graphene was found to be 98, 105, and 145 mg g −1 for AY, respectively.

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Chemically bonded multiwalled carbon nanotubes as efficient material for solid phase extraction of some metal ions in food samples

Cited by 57 publications

References 59 publications

Characterization and optimization of effluent dye removal using a new low cost adsorbent: Equilibrium, kinetics and thermodynamic study

Characterization and optimization of effluent dye removal using a new low cost adsorbent: Equilibrium, kinetics and thermodynamic study

Functionalization of multiwalled carbon nanotubes for the solid-phase extraction of silver, cadmium, palladium, zinc, manganese and copper by flame atomic absorption spectrometry

CuFe2O4@graphene nanocomposite as a sorbent for removal of alizarine yellow azo dye from aqueous solutions

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