scholarly journals Polysulfone Membranes Based Hybrid Nanocomposites for the Adsorptive Removal of Hg(II) Ions

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2792
Author(s):  
Abeer M. Alosaimi
Keyword(s):  
Carbon Nanotubes ◽  
High Performance ◽  
Carbon Nanomaterials ◽  
Chemical Properties ◽  
Inorganic Nanoparticles ◽  
Hybrid Nanocomposites ◽  
Inversion Method ◽  
Hybrid Nanocomposite ◽  
Nanocomposite Membranes ◽  
Oxidized Carbon

Organic–inorganic nanoparticles, which can improve and modify the mechanical and chemical properties of polymers, have been used as fillers to prepare high-performance hybrid nanocomposite membranes. In this study, we explored whether the incorporation of organic nanofillers (graphene (G), graphene oxide (GO), carbon nanotubes (CNTs), or oxidized carbon nanotubes (CNTOxi)) into polysulfone (PSF) and montmorillonite (MMt)-modified PSF membranes could enhance membrane performance for the removal of heavy metal ions from contaminated solutions. These hybrid membranes were prepared by a phase inversion method using chloroform as the solvent. The surface morphologies of the membranes revealed good dispersibility of the organoclay and carbon nanomaterials in the PSF matrix. The hybrid nanocomposite membranes showed significantly improved thermal stability and mechanical properties as compared to the pristine PSF and PSF/MMt membranes. The adsorption efficiencies of these hybrid adsorptive membranes for Hg(II), Pb(II), Sr(II), Fe(III), Zn(II), Ni(II), Al(III), Co(II), Y(III), and Cr(III) were investigated. The PSF/MMt/CNTOxi and PSF/MMt/GO membranes exhibited the highest adsorption efficiencies. In particular, these adsorptive membranes showed selectivity toward Hg(II), and the Hg(II) extraction percentage was maximized at pH 2. The maximum Hg(II) adsorption capacities of PSF/MMt/CNTOxi and PSF/MMt/GO were 151.36 and 144.89 mg/g, respectively, and the adsorption isotherm was in approval with the Langmuir model. These hybrid nanocomposites can be used in water purification application.

Synergistic effect of carbon nanotubes and nano-hydroxyapatite on mechanical properties of polyetheretherketone based hybrid nanocomposites

2020 ◽  
pp. 096739112096950
Author(s):  
Manjeet Kumar ◽  
Rajesh Kumar ◽  
Sandeep Kumar
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Elastic Modulus ◽  
Storage Modulus ◽  
Fracture Resistance ◽  
Compression Molding ◽  
Mechanical Analysis ◽  
Hybrid Nanocomposites ◽  
Hybrid Nanocomposite ◽  
And Storage

Hybrid nanocomposites utilize the benefits of properties of different fillers to enhance its desired properties. Polyetheretherketone (PEEK) based hybrid nanocomposites have immense potential applications in aerospace, automobile, high-temperature electrical applications, and medical and health care. The present work is an attempt to improve the elastic modulus, hardness, fracture resistance, and storage modulus simultaneously by reinforcing the PEEK matrix with multiwall carbon nanotubes (MWCNTs) filler and 30 wt.% nano hydroxyapatite (nHA)-MWCNT hybrid filler. The nanocomposites having 0,1,3,5 and 7 wt.% of MWCNTs were fabricated by the Ball Mixing and Compression Molding Method. Customized Die Heater setup was used to ensure uniform heating and cooling during compression molding. The morphology was examined by Field Emission Scanning Electron Microscopy (FESEM) and Energy-Dispersive X-ray Spectroscopy (EDS) and uniform distribution of nano-fillers was observed. The nanoindentation method was adopted to investigate the Static Mechanical Analysis (SMA) and Dynamic Mechanical Analysis (DMA) at varying frequencies of loading, of nanocomposites. At 5 wt.% of MWCNTs, the enhancements in elastic modulus, hardness, fracture resistance, and storage modulus were observed to be 80%, 36%, 32%, and 58% respectively in case of PEEK/(0–7%)MWCNT nanocomposite and 104%, 76%, 16%, and 80% respectively in case of PEEK/30%nHA-(0–7%)MWCNT hybrid nanocomposite. The decrements in loss factor indicated the improvement in elastic behavior of nanocomposites with increasing wt.% of MWCNTs. The elastic modulus of PEEK/30%nHA-5%MWCNT hybrid nanocomposite was observed to be 7.67 GPa, which falls within the range of elastic modulus of the human cortical bone. The results revealed that 5 wt.% of MWCNTs is optimum filler composition for improving the mechanical properties.

Layered SnS2 cross-linked by carbon nanotubes as a high performance anode for sodium ion batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (42) ◽  
pp. 35197-35202 ◽  
Author(s):  
Haomiao Li ◽  
Min Zhou ◽  
Wei Li ◽  
Kangli Wang ◽  
Shijie Cheng ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Performance ◽  
High Capacity ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Hybrid Nanocomposite

Facile synthesized SnS2@CNT hybrid nanocomposite exhibits high capacity and good cyclability as anode for sodium ion batteries.

High-performance reverse osmosis nanocomposite membranes containing the mixture of carbon nanotubes and graphene oxides

2015 ◽  
Vol 3 (13) ◽  
pp. 6798-6809 ◽  
Author(s):  
Hee Joong Kim ◽  
Min-Young Lim ◽  
Kyung Hwa Jung ◽  
Dong-Gyun Kim ◽  
Jong-Chan Lee
Keyword(s):  
Carbon Nanotubes ◽  
Reverse Osmosis ◽  
High Performance ◽  
Polymeric Matrix ◽  
Nanocomposite Membrane ◽  
Nanocomposite Membranes ◽  
Graphene Oxides ◽  
Synergistic Combinations

Nanocomposite membrane containing CNTs and GO exhibits considerably improved performances by the synergistic combinations of CNTs and GO, which can increase the dispersity in a polymeric matrix.

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.

Growth of carbon nanotubes on graphene as 3D biocathode for NAD+/NADH balance model and high-rate production in microbial electrochemical synthesis from CO2

2019 ◽  
Vol 7 (3) ◽  
pp. 1115-1123 ◽  
Author(s):  
Shuo Han ◽  
Hong Liu ◽  
Charles Zhou ◽  
Han-jie Ying
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Synthesis ◽  
High Performance ◽  
Carbon Nanomaterials ◽  
Three Dimensional ◽  
High Rate ◽  
Balance Model ◽  
Design And Synthesis

Design and synthesis of three-dimensional (3D) structured carbon nanomaterials for achieving high-performance electrode for microbial electrochemical synthesis (MES).

scholarly journals Quaternary Holey Carbon Nanohorns/SnO2/ZnO/PVP Nano-Hybrid as Sensing Element for Resistive-Type Humidity Sensor

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1307
Author(s):  
Bogdan-Catalin Serban ◽  
Cornel Cobianu ◽  
Octavian Buiu ◽  
Marius Bumbac ◽  
Niculae Dumbravescu ◽  
...  
Keyword(s):  
Humidity Sensor ◽  
Chemical Properties ◽  
Dielectric Substrate ◽  
Nitrogen Atmosphere ◽  
Hybrid Nanocomposites ◽  
Hybrid Nanocomposite ◽  
Sensing Element ◽  
X Ray ◽  
Carbon Nanohorns ◽  
The Impact

In this study, a resistive humidity sensor for moisture detection at room temperature is presented. The thin film proposed as a critical sensing element is based on a quaternary hybrid nanocomposite CNHox//SnO2/ZnO/PVP (oxidated carbon nanohorns–tin oxide–zinc oxide–polyvinylpyrrolidone) at the w/w/w/w ratios of 1.5/1/1/1 and 3/1/1/1. The sensing structure consists of a Si/SiO2 dielectric substrate and interdigitated transducers (IDT) electrodes, while the sensing film layer is deposited through the drop-casting method. Morphology and composition of the sensing layers were investigated through scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), X-ray diffraction, and Raman spectroscopy. Each quaternary hybrid nanocomposite-based thin film’s relative humidity (RH) sensing capability was analyzed by applying a direct current with known intensity between two electrodes and measuring the voltage difference when varying the RH from 0% to 100% in a humid nitrogen atmosphere. While the sensor with CNHox/SnO2/ZnO/PVP at 1.5/1/1/1 as the sensing layer has the better performance in terms of sensitivity, the structure employing CNHox//SnO2/ ZnO/PVP at 3/1/1/1 (mass ratio) as the sensing layer has a better performance in terms of linearity. The contribution of each component of the quaternary hybrid nanocomposites to the sensing performance is discussed in relation to their physical and chemical properties. Several alternative sensing mechanisms were taken into consideration and discussed. Based on the measured sensing results, we presume that the impact of the p-type semiconductor behavior of CNHox, in conjunction with the swelling of the hydrophilic polymer, is dominant and leads to the overall increasing resistance of the sensing film.

scholarly journals Formation Features of Hybrid Nanocomposites Based on Polydiphenylamine-2-Carboxylic Acid and Single-Walled Carbon Nanotubes

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1181 ◽  
Author(s):  
Sveta Zhiraslanovna Ozkan ◽  
Galina Petrovna Karpacheva ◽  
Aleksandr Ivanovich Kostev ◽  
Galina Nikolaevna Bondarenko
Keyword(s):  
Carbon Nanotubes ◽  
Carboxylic Acid ◽  
Carbon Nanomaterials ◽  
Oxidative Polymerization ◽  
Ammonium Hydroxide ◽  
Single Walled Carbon Nanotubes ◽  
Hybrid Nanocomposites ◽  
Heterophase System ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Hybrid nanocomposites based on electroactive polydiphenylamine-2-carboxylic acid (PDPAC) and single-walled carbon nanotubes (SWCNTs) were obtained for the first time. Polymer-carbon nanomaterials were synthesized via in situ oxidative polymerization of diphenylamine-2-carboxylic acid (DPAC) in the presence of SWCNTs by two different ways. Hybrid SWCNT/PDPAC nanocomposites were prepared both in an acidic medium and in the heterophase system in an alkaline medium. In the heterophase system, the monomer and the SWCNTs are in the organic phase (chloroform) and the oxidant (ammonium persulfate) is in an aqueous solution of ammonium hydroxide. The chemical structure, as well as the electrical and thermal properties of the developed SWCNT/PDPAC nanocomposite materials were investigated.

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>

High Performance and Chlorine Resistant Carbon Nanotube/Aromatic Polyamide Reverse Osmosis Nanocomposite Membrane

MRS Advances ◽  
2016 ◽  
Vol 1 (20) ◽  
pp. 1469-1476 ◽  
Author(s):  
Rodolfo Cruz-Silva ◽  
Shigeki Inukai ◽  
Takumi Araki ◽  
Aaron Morelos-Gomez ◽  
Josue Ortiz-Medina ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Reverse Osmosis ◽  
High Performance ◽  
Mechanical Stability ◽  
Interfacial Polymerization ◽  
Polymer Network ◽  
Water Desalination ◽  
Nanocomposite Membrane ◽  
Nanocomposite Membranes ◽  
Reverse Osmosis Membranes

ABSTRACTEfficient water desalination constitutes a major challenge for the next years and reverse osmosis membranes will play a key role to achieve this target. In this work, a high-performance reverse osmosis nanocomposite membrane was prepared by interfacial polymerization in presence of multiwalled carbon nanotubes. The effect of carbon nanotubes on the chlorine resistance, antifouling and desalination performance of the nanocomposite membranes was studied. We found that the addition of carbon nanotubes not only improved the membrane performance in terms of flow and antifouling, but also inhibited the chlorine degradation of these membranes. Several reports have acknowledged the benefits of adding carbon nanotubes to aromatic PA nanocomposite membranes, but little attention has been paid to the mechanisms related to the improvement of flow rate, selectivity and chlorine tolerance. We carried out a comprehensive study of the chemical and physical effects of carbon nanotubes on the fully crosslinked polyamide network. The chemical structure, chlorine resistance and membrane degradation was studied by several analytical techniques, permeation and fouling studies, whereas the microstructure of the nanocomposite was studied by small and wide angle X-ray scattering, high resolution transmission electron microscopy, and molecular dynamics. We found that the addition of the nanotube affects the interfacial polymerization, resulting in a polymer network with smaller pore size and higher sodium and chlorine rejection. We simulated the hydration of the membrane in seawater and found that the radial distribution function of water confined in the pores of the nanocomposite membrane exhibited smaller clusters of water molecules, thus suggesting a dense membrane structure. We analysed the network mobility and found that the nanotube provides mechanical stability to the polymer matrix. This study presents solid evidence towards more efficient and robust reverse osmosis membranes using carbon nanotubes as mechanical reinforcing and chlorine protection additive.

Dehydrogenation of Bicyclohexyl on a Pt-Catalyst on the Basis of Oxidized Carbon Nanotubes

2018 ◽  
Vol 482 (1) ◽  
pp. 52-55
Author(s):  
A. Kalenchuk ◽  
◽  
S. Chernyak ◽  
V. Bogdan ◽  
V. Lunin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Pt Catalyst ◽  
Oxidized Carbon ◽  
Oxidized Carbon Nanotubes
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