scholarly journals GADOLINIUM SORPTION ON MULTI-WALLED CARBON NANOTUBES

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Danijela Maksin ◽  
Marija Vukčević ◽  
Tatjana Đurkić ◽  
Ivana Stanišić ◽  
Tamara Bakić ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Petroleum Industry ◽  
Fractional Power ◽  
Sorption Kinetics ◽  
Medical Diagnostics ◽  
Sorption Behavior ◽  
Nuclear Facilities ◽  
Equilibrium Data ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Rare earth metals are deemed to be the materials of future due to their numerous applications including medical diagnostics, nuclear facilities, petroleum industry, etc. In this paper, multi-walled carbon nanotubes, which possess unique physicochemical properties, were evaluated as sorbents for lanthanoid gadolinium from aqueous solutions. The pH-dependent sorption behavior of Gd was studied in the pH range from 3 to 11 at room temperature (298 K). Equilibrium data over a range of initial Gd concentrations of 5−50 mg L−1 was analyzed with Langmuir, Freundlich and Redlich-Peterson models. Sorption kinetics was fitted with the pseudo-first-order, the pseudo-second-order and fractional power kinetic models.

Oxidation state selective sorption behavior of plutonium using N,N-dialkylamide functionalized carbon nanotubes: experimental study and DFT calculation

RSC Advances ◽  
2016 ◽  
Vol 6 (82) ◽  
pp. 78692-78701 ◽  
Author(s):  
Nishesh Kumar Gupta ◽  
Arijit Sengupta ◽  
Anil Boda ◽  
V. C. Adya ◽  
Sk. Musharaf Ali
Keyword(s):  
Carbon Nanotubes ◽  
Experimental Study ◽  
Phase Separation ◽  
Oxidation State ◽  
Dft Calculation ◽  
Sorption Behavior ◽  
Functionalized Carbon Nanotubes ◽  
Selective Sorption ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Selective phase separation of Pu4+ and PuO22+ was performed using N,N-dialkylamide functionalized multi-walled carbon nanotubes (AFMWCNTs).

scholarly journals On the Active Adsorption of Chromium(III) from Alkaline Solutions Using Multi-Walled Carbon Nanotubes

2019 ◽  
Author(s):  
Francisco J. Alguacil ◽  
Félix A. López
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Alkaline Media ◽  
Alkaline Solutions ◽  
Order Kinetic ◽  
Experimental Conditions ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The present investigation deals with the adsorption of chromium(III) from alkaline media using multi-walled carbon nanotubes. The adsorption of Cr(III) has been studied under various experimental conditions: stirring speed of the aqueous solution, initial metal and adsorbent concentrations, NaOH concentration in the aqueous solution, and temperature. The rate law indicated that chromium adsorption is well represented by the particle diffusion model, whereas the adsorption process fits to the pseudo-second order kinetic model within an exothermic character. Equilibrium data fit to the Langmuir type-2 equilibrium isotherm in an spontaneous process. Chromium(III) can be eluted from metal-loaded nanotubes using acidic solutions, from which fine chromium(III) oxide pigment can be ultimately yielded.

scholarly journals Preparation of Magnetic Multi-Walled Carbon Nanotubes to Adsorb Sodium Dodecyl Sulfate (SDS)

2017 ◽  
Vol 4 (1) ◽  
pp. 61902-61902 ◽  
Author(s):  
Zahra Rahmani ◽  
Mohammad Taghi Samadi
Keyword(s):  
Experimental Data ◽  
Carbon Nanotubes ◽  
Aqueous Solutions ◽  
Sodium Dodecyl ◽  
Kinetic Studies ◽  
Xrd Analysis ◽  
Sorption Kinetics ◽  
Order Kinetic ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Surfactants are one of the main groups of pollutants released into aqueous solutions due to human activities and their harmful effects have been proven on human. In this study, first, magnetic multi-walled carbon nanotubes (MMWCNTs) were synthesized and then, the effects of operating parameters such as surfactant concentration, adsorbent dosage, and pH values were analyzed on the adsorption process. MMWCNTs were characterized by means of X-ray diffraction (XRD) analysis and fourier transform infrared spectroscopy (FTIR). The optimal adsorption conditions were achieved at initial pH = 4.6, adsorbent concentration = 0.5 g/L, and initial SDS concentration = 15 mg/L. In addition, the equilibrium of sorption reached after 120 min and the maximum capacity of SDS for monolayer coverage was found to be 61 mg/g at 25°C. Kinetic studies were performed under optimal conditions and the sorption kinetics was described using the pseudo-second-order kinetic model. The experimental data were studied using Freundlich, Langmuir, and Sips models. Finally, the experimental data were fitted reasonably by Langmuir isotherm. The results demonstrated that MMWCNTs with respect to their high adsorption capacity, relatively low equilibrium time, and capability to be separated from aqueous solutions (after adsorption) could be applied to wastewater treatment.

scholarly journals Error Analysis of Adsorption Isotherm Models for Sulfamethazine onto Multi Walled Carbon Nanotubes

2019 ◽  
pp. 1-10
Author(s):  
Davoud Balarak ◽  
Amir Ali Salari
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Error Analysis ◽  
Contact Time ◽  
Isotherm Models ◽  
Transmission Electron ◽  
Adsorption Isotherm Models ◽  
Equilibrium Data ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In the present study, Multi walled carbon nanotubes (MWCNTs) was used for the adsorption of Sulfamethazine (SMZ) antibiotics. The adsorbent was characterized by scanning electron microscopy, surface area (BET) and transmission electron microscopy. Batch experiments were carried out by varying the parameters like contact time, adsorbent dosage and initial Sulfamethazine concentration at fixed pH and temperature. The equilibrium data were tested with Langmuir, Freundlich, Tempkin, Dubinin–Radushkevich (D–R), Redlich-Peterson (R-P), Sips, Toth and Khan isotherm models at five Error Analysis EABS, X2, ARE, RMSE and SD and it was found that the Langmuir and Toth isotherms best fitted the adsorption of SMZ with highest value of R2 and lowest overall experimental error. Also according to the results, a maximum removal efficiency of 99.1% was obtained at pH of 7 and the contact time of 60 min; initial SMZ concentration 20 mg/L and adsorbent dose 0.8 g/L.

Multi-walled Carbon Nanotubes Penetrate into Plant Cells and Affect the Growth of Onobrychis arenaria Seedlings

Acta Naturae ◽  
2011 ◽  
Vol 3 (1) ◽  
pp. 99-106 ◽  
Author(s):  
E A Smirnova ◽  
A A Gusev ◽  
O N Zaitseva ◽  
E M Lazareva ◽  
G E Onishchenko ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Plant Cells ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Incorporation of Multi Wall Carbon Nanotubes into Glass-Surfaces via Laser-Treatment

2003 ◽  
Vol 772 ◽  
Author(s):  
T. Seeger ◽  
G. de la Fuente ◽  
W.K. Maser ◽  
A.M. Benito ◽  
A. Righi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Continuous Wave ◽  
Silica Surface ◽  
Multi Wall Carbon Nanotubes ◽  
Composite Formation ◽  
Multi Walled Carbon Nanotubes ◽  
Glass Surfaces ◽  
Walled Carbon Nanotubes ◽  
First Time ◽  
Scanning Electron

AbstractCarbon nanotubes (CNT) are interesting candidates for the reinforcement in robust composites and for conducting fillers in polymers due to their fascinating electronic and mechanical properties. For the first time, we report the incorporation of multi walled carbon nanotubes (MWNTs) into silica-glass surfaces by means of partial surface-melting caused by a continuous wave Nd:YAG laser. MWNTs were detected being well incorporated in the silica-surface. The composites are characterized using scanning electron microscopy (SEM) and Raman-spectroscopy. A model for the composite-formation is proposed based on heatabsorption by MWNTs and a partial melting of the silica-surface.

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