Aligned CNT/Polymer nanocomposite membranes for hydrogen separation

Sharma, Anshu; Kumar, Sumit; Tripathi, Balram; Singh, Manjeet; Vijay, Y.K.

doi:10.1016/j.ijhydene.2009.02.068

Cited by 111 publications

(53 citation statements)

References 19 publications

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“…The dye removal rates reach stable values for both MB and RhB within approximately 20 min, suggesting that the as-prepared composite hydrogels act as efficient dye adsorbents. In addition, the thermodynamic behaviors of the other RGO-based hydrogels for dye adsorption capacity have been characterized in detail [46]. We performed primary adsorption kinetic experiments of the as-prepared composite hydrogels on different dyes, and the obtained data are shown in Fig.…”

Section: Adsorption Capacity Of Hydrogelsmentioning

confidence: 99%

Preparation and adsorption capacity evaluation of graphene oxide-chitosan composite hydrogels

et al. 2015

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(Zhang Q)) ty, and strong mechanical strength [13−16]. For example, Banerjee et al. [17,18] successfully achieved the preparation of various hydrogels that can be used as dye-adsorbing agents in waste-water removal. In addition, this group has also reported metal-nanoparticle-containing GObased hydrogels and novel morphological transformation of graphene based nanohybrids [19−21]. Generally, GObased composite hydrogels were obtained by mixing organic macromolecules or small amphiphiles with an aqueous GO dispersion [22−24]. Chitosan (CS), a well-known compound of chitin N-deacetylation, shows many eco-friendly properties, such as biodegradation, good biocompatibility, and antifungal activity. These characteristics make it a promising candidate in the fields of catalysis, materials, food, drugs, etc. [25−27]. Since GO crosslinks with chitosan via the carboxyl, hydroxyl, epoxy, and amine groups of chitosan, the adsorption capacity of the formed composite is expected to be high. To date, some reports have been published on GO-chitosan nanocomposites used for drug release and antimicrobial activity [28−32].In this study, we report the preparation of GO-based composite hydrogels using the self-assembly of CS and GO, and an in situ reduction approach. The composite hydrogels consist of both hydrogen bonding and electrostatic interactions between the CS molecules and GO sheets. CS molecules were incorporated to facilitate the gelation process of GO sheets, and the dye adsorption capacity of the hydrogel was mainly attributed to the GO sheets. For the three dyes tested in this study, namely, Congo red (CR), methylene blue (MB), and Rhodamine B (RhB), the as-prepared composite hydrogels exhibit good removal rates in accordance with the pseudo-second-order model. More importantly, the hydrogels prepared in this study have potential large-scale applications in organic dye removal and Graphene oxide (GO)-chitosan composite hydrogels were successfully prepared via the self-assembly of chitosan molecules and GO . These as-prepared hydrogels were characterized by different techniques. The morphology of the internal network structure of the nanocomposite hydrogels was investigated. The adsorption capacity results demonstrate that the prepared GObased composite hydrogels can efficiently remove three tested dye molecules, Congo red, methylene blue and Rhodamine B, from wastewater in accordance with the pseudo-second-order model. The dye adsorption capacity of the obtained hydrogels is mainly attributed to the GO sheets, whereas the chitosan molecule was incorporated to facilitate the gelation process of the GO sheets. The present study indicates that the as-prepared composite hydrogels can serve as good adsorbents for wastewater treatment as well as the removal of harmful dyes.

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Section: Adsorption Capacity Of Hydrogelsmentioning

confidence: 99%

Preparation and adsorption capacity evaluation of graphene oxide-chitosan composite hydrogels

et al. 2015

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“…Sharma et al [161] dispersed MWCNTs and SWCNTs in polycarbonate and describe a procedure for aligning the nanotubes, using a DC-electric field of 500 V/cm. It appears that a better performance can also be obtained without this alignment procedure; nevertheless, it should be suggested to apply this in order to have a maximal benefit of the nanotubes.…”

Section: Gas Separationmentioning

confidence: 99%

The Separation Power of Nanotubes in Membranes: A Review

Bruggen

2012

ISRN Nanotechnology

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Research on mixed matrix membranes in which nanoparticles are used to enhance the membrane's performance in terms of flux, separation, and fouling resistance has boomed in the last years. This review probes on the specific features and benefits of one specific type of nanoparticles with a well-defined cylindrical structure, known as nanotubes. Nanotube structures for potential use in membranes are reviewed. These comprise mainly single-wall carbon nanotubes (SWCNTs) and multiwall carbon nanotubes (MWCNTs), but also other structures and materials, which are less studied for membrane applications, can be used. Important issues related to polymer-nanotube interactions such as dispersion and alignment are outlined, and a categorization is made of the resultant membranes. Applications are reviewed in four different areas, that is, gas separation, water filtration, drug delivery, and fuel cells.

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“…Three peaks are observed with the main peak located at about 26 , corresponding to graphite oriented along the (002) plane. 11 The other two diffraction peaks, located at 36 and 39 , respectively, correspond to the planes NiO 2 (111) and Ni (100), 12,13 suggesting that the CNT/Ni membrane is oxidized after the deposition. The inset of Figure 1(d) shows that thickness of the CNT/Ni membrane is 4.5 lm.…”

Section: Bohr-ran Huang and Tzu-ching Lin A)mentioning

confidence: 99%

Leaf-like carbon nanotube/nickel composite membrane extended-gate field-effect transistors as pH sensor

Huang

Lin

2011

Applied Physics Letters

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A leaf-like carbon nanotube/nickel (CNT/Ni) composite nanostructure is used as the sensing membrane in an extended-gate field-effect transistor (EGFET) for the pH sensors is first developed using nanocomposite plating technique. While sensing pH within a range of 2-10, the leaf-like CNT/Ni EGFET exhibits a sensitivity of 59 mV/pH. This simple and low-cost sensing membrane can be applied in disposable biosensors.

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Aligned CNT/Polymer nanocomposite membranes for hydrogen separation

Cited by 111 publications

References 19 publications

Preparation and adsorption capacity evaluation of graphene oxide-chitosan composite hydrogels

Preparation and adsorption capacity evaluation of graphene oxide-chitosan composite hydrogels

The Separation Power of Nanotubes in Membranes: A Review

Leaf-like carbon nanotube/nickel composite membrane extended-gate field-effect transistors as pH sensor

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