Thermodynamic study of Cr+3 Ions Removal by "MnO2/MWCNT" Nanocomposite

Mohammadkhani, Shima; Gholami, M. R; Aghaie, M

doi:10.13005/ojc/310321

Cited by 9 publications

(4 citation statements)

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“…However, the values for Pb(II) are comparable to those obtained by Li et al [31] for carbon nanotube oxidates. In addition, the values of Cr(VI) sorption agree well with those reported in [46][47][48][49][50] for the raw and diversely modified carbon nanotubes. The high sorption capacity of Cr(VI) suggests that the raw SWCNTs materials are more promising for hexavalent Cr(VI) sorption.…”

Section: Sorption Capacitiessupporting

confidence: 87%

“…Zn(II) and K(I) have the poorest sorption capacities suggesting that they are unlikely to be sorbed by the raw SWCNTs. However, various studies have shown that the sorption capacity of some metals can be improved by oxidizing or purifying raw carbon nanotubes [2,[46][47][48][49][50]. The maximum sorption capacity for all elements was obtained at pH 2, except for Zn (at pH 3).…”

Section: Sorption Capacitiesmentioning

confidence: 99%

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Sorption of metal elements by single-walled carbon nanotubes and x-ray absorption spectroscopy analysis

Tchienkoua,

Thiodjio Sendja,

Tchenguem Kamto

et al. 2023

Phys. Scr.

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Single-walled carbon nanotubes (SWCNTs) were used for the sorption of monovalent K(I), divalent Pb(II), Zn(II) and Cd(II) in addition to hexavalent Cr(VI) metal elements from aqueous solutions. X-ray absorption spectroscopy (XAS) was employed for the preliminary characterization of the metals sorbed SWCNTs materials. The adsorption capacities of the investigated metals are associated with the functional groups involved in the sorption mechanism. The sorption and XAS results revealed that hexavalent Cr(VI) was highly adsorbed by SWCNTs. The sorption mechanism of Cr(VI) is associated with the reduction of Cr(VI) to trivalent Cr(III). XAS also suggested that in the environment nearest to the sorbed metals Cr, Pb, Zn and K, the existing binding interactions are Cr-O, Pb-O, Zn-O and K-O respectively.

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Section: Sorption Capacitiessupporting

confidence: 87%

Section: Sorption Capacitiesmentioning

confidence: 99%

Sorption of metal elements by single-walled carbon nanotubes and x-ray absorption spectroscopy analysis

Tchienkoua,

Thiodjio Sendja,

Tchenguem Kamto

et al. 2023

Phys. Scr.

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“…According to the literature, Multi-walled carbon nanotubes (MWCNTs) have shown an ability to efficiently remove various organic pollutants such as dioxins, polychlorinated dibenzo-furans and biphenyls from aqueous environments 5,6 . Nowadays, considerable efforts have been made to produce metal-carbon nanocomposite materials, not only because the carbonic compound improves the mechanical properties of the composites, but also because the produced composites possess the properties of individual components with a synergistic effect 7,8 . Therefore, the present work focuses on preparing ANMWC composite as an effective adsorbent and then the effect of produced composite in BPA removal from aqueous solutions was studied.…”

Section: Introductionmentioning

confidence: 99%

Removal of Bisphenol, Using Antimony Nanoparticle Multi-walled Carbon Nanotubes Composite from Aqueous Solutions

Samadi¹,

Shokoohi²,

Poormohammadi³

et al. 2015

Orient. J. Chem

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This study focuses on preparing Antimony Nanoparticle Multi-walled Carbon (ANMWC) composite as an effective adsorbent and then the effect of produced composite in BPA removal from aqueous solutions was studied. ANMWC were prepared using chemical method and characterized with X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR) and Brunauer-EmmettTeller (BET). Moreover, the removal efficiency of prepared AMWCNT and Nanoparticle Multi-walled Carbon (MWCNT) in removal of Bisphenol A was investigated. Results revealed that the BPA removal efficiency by AMWCNT increased from 80 to 93 % with the increase of contact time 5 to 60 min. The maximum removal efficiency for the both adsorbents was seen at pH 7, which was 85% for MWCNT and 95% for ANMWC composite. According to the results obtained, pH zpc for both adsorbents was 7. Results showed that the adsorption process followed the pseudo-first order model with a high correlation value and BPA adsorption on MWCNT followed the Langmuir isotherm model.

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“…In recent years, solid phase extraction (SPE) has become one of the most popular techniques for the separation of chromium species, as it can be easily coupled with electrothermal atomic absorption spectrometry (ETAAS), inductively coupled plasma mass spectrometry (ICP-MS) or inductively coupled plasma optical emission spectrometry (ICP-OES). Although commercially available materials are often used as solid sorbents, there has been an increasing interest in recent years to design special, new materials that are characterized by high selectivity for a given analyte, e.g., functionalized graphene and carbon nanotubes [16], nanocomposites [17,18], nanoparticles [15,19] or ion imprinted polymers [20][21][22][23][24][25][26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Development of Solid Phase Extraction Method Based on Ion Imprinted Polymer for Determination of Cr(III) Ions by ETAAS in Waters

Trzonkowska

Leśniewska

Godlewska‐Żyłkiewicz

2022

Water

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In this work, a new solid phase extraction method for the determination of chromium species in water samples by electrothermal atomic absorption spectrometry was developed. For selective separation of Cr(III) ions under dynamic conditions, two ion imprinted polymers containing Cr(III)-1,10-phenanthroline complex (Cr(III)-phen) were prepared with the use of one (styrene, ST) or two (styrene and 4-vinylpyridine, ST-4VP) functional monomers. The physicochemical properties of those solid sorbents towards Cr(III) ions were studied and compared. It was found that Cr(III) ions were retained on the Cr(III)-phen-ST and Cr(III)-phen-ST-4VP polymers with high efficiency and repeatability (91.6% and 92.9%, RSD < 2%) from solutions at pH 4.5. The quantitative recovery of the analyte (91.7% and 93.9%, RSD < 4%) was obtained with 0.1 mol/L EDTA solution. The introduction of 4VP, an additional functional monomer, improved selectivity of the Cr(III)-phen-ST-4VP polymer towards Cr(III) ions in the presence of Cu(II), Mn(II) and Fe(III) ions, and slightly decreased the sorption capacity and stability of that polymer. The accuracy of procedures based on both polymeric sorbents was proved by analyzing the standard reference material of surface water SRM 1643e. The method using the Cr(III)-phen-ST polymer was applied for determining of Cr(III) ions in tap water and infusion of a green tea.

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Thermodynamic study of Cr+3 Ions Removal by "MnO2/MWCNT" Nanocomposite

Cited by 9 publications

References 0 publications

Sorption of metal elements by single-walled carbon nanotubes and x-ray absorption spectroscopy analysis

Sorption of metal elements by single-walled carbon nanotubes and x-ray absorption spectroscopy analysis

Removal of Bisphenol, Using Antimony Nanoparticle Multi-walled Carbon Nanotubes Composite from Aqueous Solutions

Development of Solid Phase Extraction Method Based on Ion Imprinted Polymer for Determination of Cr(III) Ions by ETAAS in Waters

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