Facile surface functionalization of multiwalled carbon nanotubes by soft dielectric barrier discharge plasma: Generate compatible interface for lipase immobilization

Rastian, Zahra; Khodadadi, Abbas Ali; Vahabzadeh, Farzaneh; Bortolini, Christian; Dong, Mingdong; Mortazavi, Yadollah; Mogharei, Azadeh; Vesali‐Naseh, Masoud; Guo, Zheng

doi:10.1016/j.bej.2014.05.009

Cited by 35 publications

(13 citation statements)

References 49 publications

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“…Single-walled carbon nanotubes (SWCNTs) consist of only one sheet of graphite flake curling around a central axis, while multi-walled carbon nanotubes (MWCNTs) are formed by several graphite sheets curling around a central axis (Zhang et al 2013; Feng and Ji 2011). MWCNTs have better physical and chemical stability, lower price, easier preparation and lower toxicity than SWCNTs (Rastian et al 2014; Lee et al 2006). Carbon nanotube immobilized enzymes have a large surface area, high enzyme content, and superior dispersibility (Apetrei and Apetrei 2015; Pang et al 2015).…”

Section: Introductionmentioning

confidence: 99%

A study on the enzymatic properties and reuse of cellulase immobilized with carbon nanotubes and sodium alginate

Li¹,

Xia

Ma³

et al. 2019

AMB Expr

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Cellulase has many potential applications in ethanol production, extraction of medicinal ingredients, food, brewing, oil exploration, environmental protection. However, the widespread use of cellulase is limited by its relatively high production costs and low biological activity. Therefore, we studied the enzymatic properties and reusability of cellulase immobilized on multiwalled carbon nanotubes and sodium alginate for the first time. The results showed that the optimum temperature and pH of immobilized cellulase was 40 °C and 3.0, respectively. After 1 month of storage at 4 °C, the enzyme activity of immobilized cellulase dropped to 71.2% of the baseline. Immobilized cellulase was proved to be reusable and maintained ~ 70% of its activity after 7 cycles of repeated use. Versus free cellulase, the immobilized cellulase showed good thermal stability, pH resistance, storage stability and reusability, which could be beneficial in large-scale industrial manufacturing processes.

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Section: Introductionmentioning

confidence: 99%

A study on the enzymatic properties and reuse of cellulase immobilized with carbon nanotubes and sodium alginate

Li¹,

Xia

Ma³

et al. 2019

AMB Expr

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“…Note that the methylene peaks of the pristine MWCNTs grown by chemical method have been commonly observed. [ 31 ] The XPS spectra from the PLFL process (0.50–1.00 J) can be deconvoluted into three bands with binding energies of 284.4, 286.6, and 288.8 eV, associated with sp 2 carbon (CC), hydroxyl groups (C(COH)), and carboxyl groups (CO), respectively (Figure 3a–c). The percentages for the deconvoluted peaks are summarized in Figure 3f, clearly indicating that with an increase in the pulse laser energy, the content of CC bond decreases, whereas the content of the oxygen functional groups increases.…”

Section: Resultsmentioning

confidence: 99%

Fundamental Understanding of the Formation Mechanism for Graphene Quantum Dots Fabricated by Pulsed Laser Fragmentation in Liquid: Experimental and Theoretical Insight

Kang

Jung

Mhin

et al. 2020

Small

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The pulsed laser fragmentation in liquid (PLFL) process is a promising technique for the synthesis of carbon‐based functional materials. In particular, there has been considerable attention on graphene quantum dots (GQDs) derived from multiwalled carbon nanotubes (MWCNTs) by the PLFL process, owing to the low cost and rapid processing time involved. However, a fundamental deep understanding of the formation of GQDs from MWCNTs by PLFL has still not been achieved despite the high demand. In this work, a mechanism for the formation of GQDs from MWCNTs by the PLFL process is reported, through the combination of experimental and theoretical studies. Both the experimental and computational results demonstrate that the formation of GQDs strongly depends on the pulse laser energy. Both methods demonstrate that the critical energy point, where a plasma plume is generated on the surface of the MWCNTs, should be precisely maintained to produce GQDs; otherwise, an amorphous carbon structure is favorably formed from the scattered carbons.

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“…The yeast grown on YEPD medium was used 25 . Pristine MWCNTs were functionalised by covalent modification as reported previously 31 , 62 . A 200 mL of 0.5 mol L −1 H 2 SO 4 , was mixed with 0.25 g of KMnO 4 as an initial step for oxidation.…”

Section: Methodsmentioning

confidence: 99%

Potential Application of Saccharomyces cerevisiae and Rhizobium Immobilized in Multi Walled Carbon Nanotubes to Adsorb Hexavalent Chromium

Sathvika

Soni

Sharma

et al. 2018

Sci Rep

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The presence of harmful contaminants in the waste stream is an important concern worldwide. The convergence of biotechnology and nanoscience offers a sustainable alternative in treating contaminated waters. Hexavalent chromium, being carcinogenic deserves effective and sustainable methods for sequestration. Here in, we report the immobilization of a prokaryote (Rhizobium) and eukaryote (Saccharomyces cerevisiae) in multiwalled carbon nanotubes (MWCNTs) for the effective adsorption of hexavalent chromium. The carboxylic groups were introduced into the MWCNTs during oxidation using potassium permanganate and were subjected to EDC-HOBT coupling to bind with microbial cell surface. FTIR, TGA, BET, FESEM-EDAX, HRTEM, XPS and confocal microscopy were the investigative techniques used to characterize the developed biosorbents. Experimental variables such as pH, adsorbent dosage, kinetics, isotherms and thermodynamics were investigated and it was observed that the system follows pseudo second order kinetics with a best fit for Langmuir isotherm. Electrostatic interactions between the functional groups in the microbial cell wall and hydrochromate anion at pH 2.0 propel the adsorption mechanism. The lab scale column studies were performed with higher volumes of the Cr(VI) contaminated water. Sodium hydroxide was used as the desorbing agent for reuse of the biosorbents. The sustainable biosorbents show prospects to treat chromium contaminated water.

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Facile surface functionalization of multiwalled carbon nanotubes by soft dielectric barrier discharge plasma: Generate compatible interface for lipase immobilization

Cited by 35 publications

References 49 publications

A study on the enzymatic properties and reuse of cellulase immobilized with carbon nanotubes and sodium alginate

A study on the enzymatic properties and reuse of cellulase immobilized with carbon nanotubes and sodium alginate

Fundamental Understanding of the Formation Mechanism for Graphene Quantum Dots Fabricated by Pulsed Laser Fragmentation in Liquid: Experimental and Theoretical Insight

Potential Application of Saccharomyces cerevisiae and Rhizobium Immobilized in Multi Walled Carbon Nanotubes to Adsorb Hexavalent Chromium

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