scholarly journals Adsorption of Phenol from Aqueous Solutions by Carbon Nanomaterials of One and Two Dimensions: Kinetic and Equilibrium Studies

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
M. de la Luz-Asunción ◽  
V. Sánchez-Mendieta ◽  
A. L. Martínez-Hernández ◽  
V. M. Castaño ◽  
C. Velasco-Santos
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Electrostatic Interactions ◽  
Carbon Nanomaterials ◽  
Adsorption Process ◽  
Chemical Properties ◽  
Freundlich Isotherm ◽  
Two Dimensions ◽  
Multiwalled Carbon ◽  
Equilibrium Studies

Carbon nanomaterials have a great potential in environmental studies; they are considered as superior adsorbents of pollutants due to their physical and chemical properties. Functionalization and dimension play an important role in many functions of these nanomaterials including adsorption. In this research, adsorption process was achieved with one-dimension nanomaterials: single walled and multiwalled carbon nanotubes were used as received and after oxidation treatment also two-dimensional nanomaterials were used: graphene oxide and reduced graphene oxide. Carbon nanotubes were modified by hydrogen peroxide under microwave irradiation. The reduction of graphene oxide was achieved by using ascorbic acid.R2values obtained with the pseudo-second-order model are higher than 0.99. The results demonstrate that Freundlich isotherm provides the best fit for the equilibrium data (R2>0.94).RLvalues are between 0 and 1; this represents favorable adsorption between carbon nanomaterials and phenol. The adsorption process occurs byπ-πinteractions and hydrogen bonding and not by electrostatic interactions. The results indicate that the adsorption of phenol on carbon nanomaterials depends on the adsorbents’ surface area, and it is negatively influenced by the presence of oxygenated groups.

scholarly journals Aerogels Based on Graphene Oxide with Addition of Carbon Nanotubes: Synthesis and Properties

2014 ◽  
Vol 16 (4) ◽  
Author(s):  
F.R. Sultanov ◽  
Shin-Shem Steven Pei ◽  
M. Auyelkhankyzy ◽  
G. Smagulova ◽  
B.T. Lesbayev ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Carbon Nanomaterials ◽  
Chemical Properties ◽  
Aqueous Dispersion ◽  
Chitosan Solution ◽  
Graphene Layers ◽  
Physico Chemical ◽  
Sorption Ability ◽  
High Sorption

<p>Nowadays numerous sorbents based on graphene and other carbon nanomaterials have been synthesized for the removal or collecting of oil remains due to its unique physico-chemical properties. Obtaining of aerogels based on graphene oxide and carbon nanotubes with addition of chitosan solution as a binder <br />component is shown in this paper. Aerogels were synthesized by reduction of aqueous dispersion of graphene oxide using the reducing agents, followed by ultrasonic and thermal treatment. Ultrasound destroys the graphene layers, decreasing them in size, thereby exposing new layers to form edges that already have no stabilizing carboxyl groups, which are located at the edges, and participate in the formation of bonds. The surface morphology of obtained aerogels was studied by SEM. The study of the sorption capacity showed that graphene/CNTs aerogel is characterized by short absorption time and high sorption ability that depend <br />on densities of the used solvents. All experimental results show the possibility of using the aerogels based on graphene and CNTs as sorbents for collection of oil residues.</p>

scholarly journals Kinetics and Equilibrium Studies on Adsorption of Acid Red 18 (Azo-Dye) Using Multiwall Carbon Nanotubes (MWCNTs) from Aqueous Solution

2012 ◽  
Vol 9 (4) ◽  
pp. 2371-2383 ◽  
Author(s):  
Mohammad Shirmardi ◽  
Alireza Mesdaghinia ◽  
Amir Hossein Mahvi ◽  
Simin Nasseri ◽  
Ramin Nabizadeh
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Azo Dye ◽  
Adsorption Process ◽  
Maximum Adsorption Capacity ◽  
Synthetic Dyes ◽  
Multiwalled Carbon ◽  
Equilibrium Studies ◽  
Mass Unit ◽  
Adsorbent Dosage

Azo dyes are one of the synthetic dyes that are used in many textile industries. Adsorption is one of the most effective techniques for removal of dye-contaminated wastewater. In this work, efficiency of multiwalled carbon nanotubes (MWCNTs) as an adsorbent for removal of Acid Red 18 (azo-dye) from aqueous solution was determined. The parameters affecting the adsorption process such as contact time, pH, adsorbent dosage, and initial dye concentration were studied. Experimental results have shown by increasing the adsorbent dosage, the rate of dye removal was increased, but the amount of adsorbed dyes per mass unit of MWCNTs was declined. pH as one of the most important influencing factors on the adsorption process was evaluated. The best pH for adsorption process was acidic pH of about 3. To describe the equilibrium of adsorption, the Langmuir, Freundlich and Temkin isotherms were used. The Langmuir isotherm (R2=0.985) was the best fitted for experimental data with maximum adsorption capacity of 166.67 mg/g. A higher correlation value of the kinetic's model was observed close to pseudo second order (R2=0.999) compared to other kinetic models.

Sorption of Bisphenol A in Aqueous Solutions on Irradiated and as-Grown Multiwalled Carbon Nanotubes

2018 ◽  
Vol 69 (5) ◽  
pp. 1233-1239
Author(s):  
Raluca Madalina Senin ◽  
Ion Ion ◽  
Ovidiu Oprea ◽  
Rusandica Stoica ◽  
Rodica Ganea ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Bisphenol A ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Multiwalled Carbon Nanotubes ◽  
Adsorption Process ◽  
Sorption Process ◽  
Multiwalled Carbon ◽  
Before And After ◽  
Kinetic Sorption

In this study, non-irradiated and weathered multiwalled carbon nanotubes (MWCNTs) obtained through irradiation, were studied as adsorbents for BPA, both nanomaterials being characterized before and after the adsorption process. The objectives of our investigation were to compare the characteristics of non-irradiated and irradiated MWCNTs, to evaluate the adsorption capacity of BPA by pristine and irradiated MWCNTs and to determine the variation of the kinetic, sorption and thermodynamic parameters during sorption process using both sorbents.

Comparative cytotoxicity of kaolinite, halloysite, multiwalled carbon nanotubes and graphene oxide

2021 ◽  
Vol 205 ◽  
pp. 106041
Author(s):  
Elvira Rozhina ◽  
Svetlana Batasheva ◽  
Regina Miftakhova ◽  
Xuehai Yan ◽  
Anna Vikulina ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon

Retracted Article: Enhanced adsorption of ionizable aromatic compounds on humic acid-coated carbonaceous adsorbents

RSC Advances ◽  
2012 ◽  
Vol 2 (27) ◽  
pp. 10359-10364 ◽  
Author(s):  
Yubing Sun ◽  
Changlun Chen ◽  
Dadong Shao ◽  
Jiaxing Li ◽  
Xiaoli Tan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Activated Carbon ◽  
Humic Acid ◽  
Aromatic Compounds ◽  
Flake Graphite ◽  
Graphene Oxide Nanosheets ◽  
Multiwalled Carbon ◽  
Retracted Article ◽  
Enhanced Adsorption

Adsorption of ionizable aromatic compounds (IACs) such as 1-naphthylamine and 1-naphthol on Humic acid (HA)-coated graphene oxide nanosheets (GONs), multiwalled carbon nanotubes (MWCNTs), activated carbon (AC), and flake graphite (FG) were investigated by the batch techniques.

scholarly journals Environmental fate of multiwalled carbon nanotubes and graphene oxide across different aquatic ecosystems

NanoImpact ◽  
2019 ◽  
Vol 13 ◽  
pp. 1-12 ◽  
Author(s):  
Brian Avant ◽  
Dermont Bouchard ◽  
Xiaojun Chang ◽  
Hsin-Se Hsieh ◽  
Brad Acrey ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Multiwalled Carbon Nanotubes ◽  
Aquatic Ecosystems ◽  
Environmental Fate ◽  
Multiwalled Carbon
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