Adsorption of cadmium and lead onto oxidized nitrogen-doped multiwall carbon nanotubes in aqueous solution: equilibrium and kinetics

Pérez‐Aguilar, Nancy Verónica; Muñoz‐Sandoval, Emilio; Diaz‐Flores, Paola E.; Rangel-Mendez, J. Rene

doi:10.1007/s11051-009-9670-6

Cited by 55 publications

(31 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although the properties such as the semi-conducting properties of these materials are well understood [25] little is known about their function in metal ion exchange. Although Perez-Aguilar et al [26] showed that oxidized nitrogen-doped carbon nanotubes were more effective for the uptake of Cd(II) and Pb(II) than undoped unoxidised MWCNTs the actual role played by the introduction of nitrogen as a heteroatom in this study was not clear. Pillay [14] investigated this further and found that the role played by the nitrogen atom depends largely on the form in which nitrogen occurs on the carbon nanotubes, For instance if quartenary nitrogen is present this can result in positively charged nitrogen centres which increase the pHPZC and favour anion uptake.…”

Section: The Effect Of Heteroatom Doping On the Ion Exhange Propertiecontrasting

confidence: 59%

Carbon Nanomaterials – A New Form of Ion Exchangers

Pillay¹

2012

Ion Exchange Technologies

View full text Add to dashboard Cite

Section: The Effect Of Heteroatom Doping On the Ion Exhange Propertiecontrasting

confidence: 59%

Carbon Nanomaterials – A New Form of Ion Exchangers

Pillay¹

2012

Ion Exchange Technologies

View full text Add to dashboard Cite

“…As shown in Table 2, the maximum absorption capacity obtained in this study is significant compared to other adsorbents [35][36][37][38][39][40][41][42][43][44][45][46], which indicates the efficiency of the synthetic adsorbent.…”

Section: Adsorption Isothermsmentioning

confidence: 66%

Synthesis, characterization, and application of nickel oxide/CNT nanocomposites to remove Pb2+ from aqueous solution

et al. 2017

View full text Add to dashboard Cite

In this study, the efficiency of nickel oxide/carbon nanotube (NiO/CNT) nanocomposite to remove Pb 2? from aqueous solution is investigated. NiO/CNT nanocomposite was prepared using the direct coprecipitation method in an aqueous media in the presence of CNTs. Samples were characterized using simultaneous thermal analysis (STA), X-ray diffraction (XRD), filed emission scanning electron microscopy (FESEM), and BrunauerEmmett-Teller (BET). To optimize the adsorption of Pb 2?ions on NiO/CNT nanocomposite, the effects of different parameters including pH, contact time, initial concentration of Pb 2? , and adsorbent mass-were also investigated. The optimum Pb 2? removal efficiency on NiO/CNT nanocomposite is achieved under experimental conditions of pH 7, contact time of 10 min, initial Pb 2? concentration of 20 ppm, and adsorbent mass of 0.1 g. The experimental data showed that the Pb 2? ions adsorption of NiO/CNT nanocomposite was through a Freundlich isotherm model rather than a Langmuir model. The kinetic data of adsorption of Pb 2? ions on the adsorbent was perfectly shown by a pseudo-second-order equation, to indicate their chemical adsorption. Thermodynamic parameters such as DG°, DH°, and DS°were also measured; the obtained values showed that the adsorption was basically spontaneous and endothermic.

show abstract

“…The G‐bands involve phonon modes which are associated with carbon atom vibrations along the axis and transfer electrons . D‐bands are assigned to a double‐resonance Raman effect in sp 2 carbon which is related with the amorphous or disordered carbon structure …”

Section: Resultsmentioning

confidence: 99%

Effect of doping in carbon nanotubes on the viability of biomimetic chitosan‐carbon nanotubes‐hydroxyapatite scaffolds

Fonseca-García

Mota‐Morales

Quintero-Ortega

et al. 2013

J Biomedical Materials Res

View full text Add to dashboard Cite

This work describes the preparation and characterization of biomimetic chitosan/multiwall carbon nanotubes/nano-hydroxyapatite (CTS/MWCNT/nHAp) scaffolds and their viability for bone tissue engineering applications. The cryogenic process ice segregation-induced self-assembly (ISISA) was used to fabricate 3D biomimetic CTS scaffolds. Proper combination of cryogenics, freeze-drying, nature and molecular ratio of solutes give rise to 3D porous interconnected scaffolds with clusters of nHAp distributed along the scaffold surface. The effect of doping in CNT (e.g. with oxygen and nitrogen atoms) on cell viability was tested. Under the same processing conditions, pore size was in the range of 20-150 μm and irrespective on the type of CNT. Studies on cell viability with scaffolds were carried out using human cells from periosteum biopsy. Prior to cell seeding, the immunophenotype of mesenchymal periosteum or periosteum-derived stem cells (MSCs-PCs) was characterized by flow cytometric analysis using fluorescence-activated and characteristic cell surface markers for MSCs-PCs. The characterized MSCs-PCs maintained their periosteal potential in cell cultures until the 2nd passage from primary cell culture. Thus, the biomimetic CTS/MWCNT/nHAp scaffolds demonstrated good biocompatibility and cell viability in all cases such that it can be considered as promising biomaterials for bone tissue engineering.

show abstract

Adsorption of cadmium and lead onto oxidized nitrogen-doped multiwall carbon nanotubes in aqueous solution: equilibrium and kinetics

Cited by 55 publications

References 69 publications

Carbon Nanomaterials – A New Form of Ion Exchangers

Carbon Nanomaterials – A New Form of Ion Exchangers

Synthesis, characterization, and application of nickel oxide/CNT nanocomposites to remove Pb2+ from aqueous solution

Effect of doping in carbon nanotubes on the viability of biomimetic chitosan‐carbon nanotubes‐hydroxyapatite scaffolds

Contact Info

Product

Resources

About