Immobilization of laccase on functionalized multiwalled carbon nanotube membranes and application for dye decolorization

RSC Advances ◽  
2016 ◽  
Vol 6 (115) ◽  
pp. 114690-114697 ◽  
Author(s):  
Abdelmageed M. Othman ◽  
Elena González-Domínguez ◽  
Ángeles Sanromán ◽  
Miguel Correa-Duarte ◽  
Diego Moldes
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Dye Decolorization ◽  
Myceliophthora Thermophila ◽  
Multiwalled Carbon ◽  
Continuous Processes ◽  
Nanotube Membranes ◽  
Carbon Nanotube Membranes ◽  
Functionalized Multiwalled Carbon Nanotubes ◽  
Supporting Membrane

Myceliophthora thermophilalaccase was covalently immobilized on functionalized multiwalled carbon nanotubes (MWNT) arranged over a supporting membrane to obtain a permeable bio-barrier that could be applied in multibatch or continuous processes.

Mechanism of Ion Exclusion by Sub-2nm Carbon Nanotube Membranes

2008 ◽  
Vol 1106 ◽  
Author(s):  
Francesco Fornasiero ◽  
Hyung Gyu Park ◽  
Jason K Holt ◽  
Michael Stadermann ◽  
Costas P Grigoropoulos ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Electrostatic Interactions ◽  
Ion Selectivity ◽  
Molecular Transport ◽  
Water Desalination ◽  
Oxygen Plasma Treatment ◽  
Nanotube Membranes ◽  
Ion Exclusion ◽  
Carbon Nanotube Membranes

AbstractCarbon nanotubes offer an outstanding platform for studying molecular transport at nanoscale, and have become promising materials for nanofluidics and membrane technology due to their unique combination of physical, chemical, mechanical, and electronic properties. In particular, both simulations and experiments have proved that fluid flow through carbon nanotubes of nanometer size diameter is exceptionally fast compared to what continuum hydrodynamic theories would predict when applied on this length scale, and also, compared to conventional membranes with pores of similar size, such as zeolites. For a variety of applications such as separation technology, molecular sensing, drug delivery, and biomimetics, selectivity is required together with fast flow. In particular, for water desalination, coupling the enhancement of the water flux with selective ion transport could drastically reduce the cost of brackish and seawater desalting. In this work, we study the ion selectivity of membranes made of aligned double-walled carbon nanotubes with sub-2 nm diameter. Negatively charged groups are introduced at the opening of the carbon nanotubes by oxygen plasma treatment. Reverse osmosis experiments coupled with capillary electrophoresis analysis of permeate and feed show significant anion and cation rejection. Ion exclusion declines by increasing ionic strength (concentration) of the feed and by lowering solution pH; also, the highest rejection is observed for the salts (A=anion, C=cation, z= valence) with the greatest zA/zC ratio. Our results strongly support a Donnan-type rejection mechanism, dominated by electrostatic interactions between fixed membrane charges and mobile ions, while steric and hydrodynamic effects appear to be less important. Comparison with commercial nanofiltration membranes for water softening reveals that our carbon nanotube membranes provides far superior water fluxes for similar ion rejection capabilities.

Substrate effect on the properties of functionalized multiwalled carbon nanotubes grown by e-beam evaporation for high performance H2O2 detection

The Analyst ◽  
2016 ◽  
Vol 141 (21) ◽  
pp. 6149-6159 ◽  
Author(s):  
K. Vijayalakshmi ◽  
D. Sivaraj
Keyword(s):  
Thin Films ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
High Performance ◽  
Electrochemical Sensing ◽  
Substrate Effect ◽  
Multiwalled Carbon ◽  
H2o2 Detection ◽  
Functionalized Multiwalled Carbon Nanotubes ◽  
Sensing Performance

In the present study, the properties of functionalized multiwalled carbon nanotube thin films deposited on Ta and Al2O3 substrates were compared for better electrochemical sensing performance towards H2O2.

Enhanced Condensation, Agglomeration, and Rejection of Water Vapor by Superhydrophobic Aligned Multiwalled Carbon Nanotube Membranes

ACS Nano ◽  
2012 ◽  
Vol 6 (7) ◽  
pp. 5980-5987 ◽  
Author(s):  
Dokyung Yoon ◽  
Cheesung Lee ◽  
Jongju Yun ◽  
Wonjae Jeon ◽  
Bong Jun Cha ◽  
...  
Keyword(s):  
Water Vapor ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Nanotube Membranes ◽  
Carbon Nanotube Membranes

Multiwalled carbon nanotube membranes for water purification

2018 ◽  
Vol 193 ◽  
pp. 378-385 ◽  
Author(s):  
Carmen Rizzuto ◽  
Giovanni Pugliese ◽  
Mohammed A. Bahattab ◽  
Saad A. Aljlil ◽  
Enrico Drioli ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Water Purification ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Nanotube Membranes ◽  
Carbon Nanotube Membranes

scholarly journals Modified Single-Walled Carbon Nanotube Membranes for the Elimination of Antibiotics from Water

Membranes ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 720
Author(s):  
Jana Gaálová ◽  
Mahdi Bourassi ◽  
Karel Soukup ◽  
Tereza Trávníčková ◽  
Daniel Bouša ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Membrane Surface ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Nanotube Membranes ◽  
Carbon Nanotube Membranes ◽  
Hydrophobic Layer ◽  
Walled Carbon Nanotubes

The hydrophilic and hydrophobic single-walled carbon nanotube membranes were prepared and progressively applied in sorption, filtration, and pertraction experiments with the aim of eliminating three antibiotics—tetracycline, sulfamethoxazole, and trimethoprim—as a single pollutant or as a mixture. The addition of SiO2 to the single-walled carbon nanotubes allowed a transparent study of the influence of porosity on the separation processes. The mild oxidation, increasing hydrophilicity, and reactivity of the single-walled carbon nanotube membranes with the pollutants were suitable for the filtration and sorption process, while non-oxidized materials with a hydrophobic layer were more appropriate for pertraction. The total pore volume increased with an increasing amount of SiO2 (from 743 to 1218 mm3/g) in the hydrophilic membranes. The hydrophobic layer completely covered the carbon nanotubes and SiO2 nanoparticles and provided significantly different membrane surface interactions with the antibiotics. Single-walled carbon nanotubes adsorbed the initial amount of antibiotics in less than 5 h. A time of 2.3 s was sufficient for the filtration of 98.8% of sulfamethoxazole, 95.5% of trimethoprim, and 87.0% of tetracycline. The thicker membranes demonstrate a higher adsorption capacity. However, the pertraction was slower than filtration, leading to total elimination of antibiotics (e.g., 3 days for tetracycline). The diffusion coefficient of the antibiotics varies between 0.7–2.7 × 10−10, depending on the addition of SiO2 in perfect agreement with the findings of the textural analysis and scanning electron microscopy observations. Similar to filtration, tetracycline is retained by the membranes more than sulfamethoxazole and trimethoprim.

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