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Wang, Hongying, et al. Chemical Engineering Science (2025): 121597.
This study presents the preparation of boron-doped multi-walled carbon nanotube electrodes (MWCNTs-B/Ti) for electrosorptive removal of organic pollutants. The fabrication process began with 0.1 g of MWCNTs subjected to acid treatment using a 1:3 v/v mixture of sulfuric and nitric acids in an ultrasonic bath for 60 minutes, followed by thorough washing with deionized water and drying at 90 °C for 24 hours.
The purified MWCNTs were then mixed with boric acid (H₃BO₃) in ethanol at varying mass ratios (1:0.5, 1:1, and 1:1.5), corresponding to MWCNTs-B-1, MWCNTs-B-2, and MWCNTs-B-3, respectively. The suspension was stirred at 80 °C in a water bath until complete solvent evaporation. The resulting solid mixture underwent pyrolysis under nitrogen atmosphere, heated to 800 °C at a rate of 15 °C/min and held for 1 hour.
This thermal treatment enabled successful incorporation of boron atoms into the carbon matrix. The doped MWCNTs were subsequently coated onto titanium substrates to form MWCNTs-B/Ti electrodes. These electrodes exhibited improved conductivity and surface hydrophobicity, facilitating the enhanced electrosorption of organic compounds such as sulfamethoxazole (SMX) from aqueous solutions.
The preparation protocol underscores the tunability of MWCNTs via heteroatom doping, offering a robust route for designing high-performance materials for water purification technologies.
Chen, Shibo, et al. Colloids and Surfaces A: Physicochemical and Engineering Aspects 628 (2021): 127309.
This study demonstrates the preparation and integration of polyvinylpyrrolidone-modified multi-walled carbon nanotubes (m-MWCNTs) into fusion-bonded epoxy (FBE) powder coatings for enhanced mechanical and anticorrosive performance.
The process began with drying MWCNTs at 80 °C for 12 hours, followed by acid treatment using H₂SO₄/HNO₃ (3:1 v/v) and sonication for 30 minutes. The mixture was then heated at 50 °C for 24 hours to remove impurities, neutralized, and dried again.
For surface modification, purified MWCNTs were reacted with polyvinylpyrrolidone (PVP) in a 1:1 mass ratio. After sonication and stirring, the product was washed to neutrality and dried, yielding m-MWCNTs. These were then ball-milled with epoxy resin powder (mass ratio 100:1, ball-to-powder 5:1) for 3 hours at 500 rpm under dry conditions.
The premixed powders were compounded with hardeners and additives, and extruded using a twin-screw extruder at 95-110 °C. The extrudate was ground and sieved to 70 µm. Coatings were applied to pretreated mild steel substrates via electrostatic spraying and cured at 200 °C for 15 minutes.
The resulting EP/m-MWCNTs nanocomposite coatings, particularly with 0.2 wt% loading, exhibited significantly improved tensile strength and corrosion resistance, attributed to the uniform dispersion of m-MWCNTs and enhanced interfacial bonding within the epoxy matrix.
Hong, Seung-Hyun, et al. Thin Solid Films 801 (2024): 140421.
Multi-walled carbon nanotubes (MWCNTs) were employed in the preparation of silicon-MWCNT (Si-MWCNT) nanocomposites using a triple DC thermal plasma jet system, aiming to enhance the electrochemical performance of lithium-ion battery anodes. The process utilized high-purity silicon powder (44 μm, 99%) and MWCNTs (5-20 nm diameter, ~10 μm length, ~90 wt%) as raw materials.
The synthesis was conducted in a plasma system equipped with triple torches, dual powder feeders, and a cyclone filtering unit. Two injection strategies were evaluated: co-feeding a homogeneously mixed Si/MWCNT powder through Feeder 1, and separate feeding, wherein MWCNTs were introduced radially into the reactor via Feeder 2, while Si powder was fed from the upper torch region via Feeder 1. The separate injection approach was strategically designed to reduce structural degradation of MWCNTs caused by direct exposure to the plasma's high-temperature core.
This configuration enabled the controlled formation of Si-MWCNT nanocomposites, leveraging the MWCNTs' high thermal stability and electrical conductivity to enhance composite integrity. The Si-MWCNT architecture is expected to mitigate silicon's volumetric expansion during cycling, providing a more durable and conductive matrix, critical for lithium-ion battery applications.
This study highlights the importance of optimized raw material injection in preserving MWCNT structure and ensuring homogeneous composite formation during thermal plasma synthesis.
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