Comparative study of acid functionalization of carbon nanotube via ultrasonic and reflux mechanism

Jun, Lau Yien; Mubarak, Nabisab Mujawar; Yon, Lau Sie; Bing, Chua Han; Khalid, Mohammad; Abdullah, Ezzat Chan

doi:10.1016/j.jece.2018.09.008

Cited by 94 publications

(36 citation statements)

References 46 publications

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“…The second stage (100 to 250 °C) weight loss was due to the decomposition of carboxylic groups and grafted PVA side chains on the surface of both the membranes 65 . As the temperature continued to rise, a weight loss in the range of 250 °C to 400 °C in both membranes occurred due to the decomposition of functional groups and PVA molecules 66,67 . Furthermore, the weight loss between 400 °C to 500 °C in both the membranes was attributed to the oxidation of MWCNTs.…”

Section: Resultsmentioning

confidence: 99%

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Immobilization of Peroxidase on Functionalized MWCNTs-Buckypaper/Polyvinyl alcohol Nanocomposite Membrane

Jun

Mubarak

Yon

et al. 2019

Sci Rep

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Surface modified Multi-walled carbon nanotubes (MWCNTs) Buckypaper/Polyvinyl Alcohol (BP/PVA) composite membrane was synthesized and utilized as support material for immobilization of Jicama peroxidase (JP). JP was successfully immobilized on the BP/PVA membrane via covalent bonding by using glutaraldehyde. The immobilization efficiency was optimized using response surface methodology (RSM) with the face-centered central composite design (FCCCD) model. The optimum enzyme immobilization efficiency was achieved at pH 6, with initial enzyme loading of 0.13 U/mL and immobilization time of 130 min. The results of BP/PVA membrane showed excellent performance in immobilization of JP with high enzyme loading of 217 mg/g and immobilization efficiency of 81.74%. The immobilized system exhibited significantly improved operational stability under various parameters, such as pH, temperature, thermal and storage stabilities when compared with free enzyme. The effective binding of peroxidase on the surface of the BP/PVA membrane was evaluated and confirmed by Field emission scanning electron microscopy (FESEM) coupled with Energy Dispersive X-Ray Spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR) and Thermogravimetric Analysis (TGA). This work reports the characterization results and performances of the surface modified BP/PVA membrane for peroxidase immobilization. The superior properties of JP-immobilized BP/PVA membrane make it promising new-generation nanomaterials for industrial applications.

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Section: Resultsmentioning

confidence: 99%

“…Initially, surface modified MWCNTs was prepared by acid functionalization, as described in our previous work 67 . The surface modified MWCNTs was dispersed into 50 mL of ethanol for 2 min using ultrasonication.…”

Section: Methodsmentioning

confidence: 99%

Immobilization of Peroxidase on Functionalized MWCNTs-Buckypaper/Polyvinyl alcohol Nanocomposite Membrane

Jun

Mubarak

Yon

et al. 2019

Sci Rep

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“…Furthermore, the use of toxic chemicals during the synthesis process also limits their widespread application. For example, the functionalization of CNT is generally carried out by the acid oxidation method using nitric acid (HNO 3 ) and sulfuric acid (H 2 SO 4 ) [18,19]. Similarly, the reduction of graphene oxide (GO) to reduced graphene oxide (RGO) is accomplished using chemical reducing agents, which may be toxic [20].…”

Section: Introductionmentioning

confidence: 99%

TiO2 NPs Assembled into a Carbon Nanofiber Composite Electrode by a One-Step Electrospinning Process for Supercapacitor Applications

Pant

Park

2019

Polymers

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In this study, we have synthesized titanium dioxide nanoparticles (TiO2 NPs) into carbon nanofiber (NFs) composites by a simple electrospinning method followed by subsequent thermal treatment. The resulting composite was characterized by state-of-the-art techniques and exploited as the electrode material for supercapacitor applications. The electrochemical behavior of the as-synthesized TiO2 NPs assembled into carbon nanofibers (TiO2-carbon NFs) was investigated and compared with pristine TiO2 NFs. The cyclic voltammetry and charge–discharge analysis of the composite revealed an enhancement in the performance of the composite compared to the bare TiO2 NFs. The as-obtained TiO2-carbon NF composite exhibited a specific capacitance of 106.57 F/g at a current density of 1 A/g and capacitance retention of about 84% after 2000 cycles. The results obtained from this study demonstrate that the prepared nanocomposite could be used as electrode material in a supercapacitor. Furthermore, this work provides an easy scale-up strategy to prepare highly efficient TiO2-carbon composite nanofibers.

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“…In this research, FTIR analysis was carried out to determine the functional groups present in both non-functionalized and functionalized MWCNTs. The resulting MWCNTs typically contain C-H, C=C, and C-C groups due to the spray pyrolysis process [24,31]. The reaction between benzene and ferrocene as a catalyst at high temperatures produces carbide bonds.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…To overcome this problem, the functionalization of MWCNTs or SWCNTs needs to be done through the reflux process, which increases its biocompatibility capabilities, particularly in terms of adsorption ability, electrostatic interactions, and covalent bonds by the presence of carboxylic groups on the walls [20][21]. However, the reflux process carried out using nitric, sulfuric, and peroxide acids or a combination of them causes significant damage to MWCNT bonds if it is not optimally controlled [22][23][24]. Therefore, the acid concentration and duration of the reflux process are still a substantial challenge to be addressed by future research.…”

Section: ■ Introductionmentioning

confidence: 99%

Application of Functionalized Multi-Walled Carbon Nanotubes for Growth Enhancement of Mustard Seed Germination

Subagio¹,

Prihastanti²,

Ngadiwiyana³

2019

Indones. J. Chem.

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Multi-walled carbon nanotubes (MWCNTs) are one of the nanomaterials that can be applied to agriculture. This work investigates the beneficial effects of MWCNT function on mustard plants. In this study, the material of MWCNTs is functionalized with nitric acid to attach the carboxylic group onto the tube wall. The functionalized MWCNTs were characterized by SEM, TEM, XRD, and FTIR. The MWCNT diameter produced ranges from 20 to 50 nm and the inner diameter is 5 to 10 nm at the pyrolysis temperature of 900 °C. It was found that crystallites of the MWCNTs have (002) and (100) directions. There is a weak peak in MWCNTs prior to the functionalization process due to the presence of metal carbide (Fe3C), which serves as an active catalyst. FTIR results clearly indicate the presence of hydroxyl and carboxylic groups. These functionalized MWCNTs were dispersed into distilled water with various concentrations at 25, 50 and 75 µg/mL. By utilizing an immersion time of 24 h, mustard (Brassica juncea) seeds were soaked in each functionalized and non-functionalized MWCNT solution. Functionalized MWCNT solution at a concentration of 50 µg/mL was found to affect the growth of mustard seeds more significantly.

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Comparative study of acid functionalization of carbon nanotube via ultrasonic and reflux mechanism

Cited by 94 publications

References 46 publications

Immobilization of Peroxidase on Functionalized MWCNTs-Buckypaper/Polyvinyl alcohol Nanocomposite Membrane

Immobilization of Peroxidase on Functionalized MWCNTs-Buckypaper/Polyvinyl alcohol Nanocomposite Membrane

TiO2 NPs Assembled into a Carbon Nanofiber Composite Electrode by a One-Step Electrospinning Process for Supercapacitor Applications

Application of Functionalized Multi-Walled Carbon Nanotubes for Growth Enhancement of Mustard Seed Germination

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