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- 2018
- CNT cold cathode
- High brightness
- Electron microscopy
- Optoelectronic Information Science and Engineering
- Kyung Hee University
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Recyclable Visible Light-driven O-g-C3N4/GO/N-CNT Membrane for Efficient Removal of Organic Pollutants
摘要： Organic pollutants are harmful to human health, which creates a global need for the development of novel and effective materials for efficiently removing contaminants. Accordingly, the efficient visible light-driven heterostructured membrane combined with oxygen-modified monolayer g-C3N4, graphene oxide, and nitrogen-doped CNT (O-g-C3N4/GO/N-CNT) was successfully fabricated through electrostatic interactions and subsequent vacuum filtration. The results suggested that the O-g-C3N4/GO/N-CNT membrane exhibited higher degradation rate than that of O-g-C3N4/GO and pure O-g-C3N4 under visible-light exposure. This enhanced photocatalytic performance was attributed to the introduction of GO and N-CNT, which acted as electronic acceptors for monolayer O-g-C3N4 that effectively inhibited recombination of photogenerated electron-hole pairs, thus enhancing visible light photocatalytic activity. Furthermore, the enrichment and degradation rate of O-g-C3N4/GO/N-CNT membranes were demonstrated for tetracycline hydrochloride, which was found up to 96.64% and 94.30%, respectively, and no distinct enrichment or catalytic activity reduction was observed when their reusability was measured. These results suggested that these recyclable O-g-C3N4/GO/N-CNT membranes provide a new strategy for the highly efficient removal of environmental pollutants.
关键词： O-g-C3N4/GO/N-CNT heterostructured membrane,Organic contaminants,Recyclable,Enhanced Photocatalytic performance,Enrichment
更新于2025-09-10 09:29:36
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Purposive Assembling of Poly(3-hexylthiophene) onto Chemically Treated Multi-Wall Carbon Nanotube versus Reduced Graphene Oxide
摘要： Surfaces of multi-walled carbon nanotubes (CNTs) and reduced graphene oxide (rGO) nanosheets were chemically modified to design distinct donor-acceptor nano-hybrids having different morphologies and orientations. In unmodified CNTs and their derivatives functionalized with 2-hydroxymethyl thiophene (CNT-f-COOTh) and grafted with poly(3-dodecylthiophene) (CNT-g-PDDT), double-fibrillar, shish-kebab, and stem-leaf nanostructures were decorated. Furthermore, rGO nanosheets functionalized with 2-thiophene acetic acid (rGO-f-TAA) and grafted with poly(3-dodecylthiophene) (rGO-g-PDDT) were prepared to study differences in CNT and rGO supramolecules. Three types of orientations subsuming face-on, edge-on, and flat-on were detected in nano-hybrids based on CNT and rGO. Morphology (fibrillar) and orientation (face-on) of poly(3-hexylthiophene) (P3HT) assemblies were similar onto unmodified CNT and rGO nanostructures. Although patternings of P3HT chains were completely different onto functionalized CNT and rGO (shish-kebab versus nanocrystal decorated nanosheets), edge-on orientation was detected in CNT-f-COOTh/P3HT and rGO-f-TAA/P3HT nano-hybrids. In CNT-g-PDDT/P3HT and rGO-g-PDDT/P3HT systems, P3HT chains were extendedly assembled onto grafted carbonic materials; however, their different natures reflected stem-leaf and patched-like configurations, respectively. For unmodified, functionalized, and grafted CNT and rGO patterned with P3HT chains, a photoluminescence quenching was detected for a donor-acceptor nature. Owing to flat-on oriented P3HTs, the best photoluminescence quenching, thereby the best donating-accepting features were detected for CNT-g-PDDT/P3HT and rGO-g-PDDT/P3HT supramolecules.
关键词： donor-acceptor,morphology,rGO,nano-hybrid,CNT
更新于2025-09-09 09:28:46
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Photo-thermal conversion structure by infiltration of paraffin in three dimensionally interconnected porous polystyrene-carbon nanotubes (PS-CNT) polyHIPE foam
摘要： In this research work, a three dimensionally (3D) interconnected porous polystyrene-carbon nanotubes (PS-CNT) polyHIPE foam was developed as a phase change material (PCM) sca?old for photo-to-thermal energy storage applications. Structural and thermal properties of the novel phase change composite were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, X–ray di?raction (XRD) spectroscopy, ultraviolet-visible di?used re?ectance spectroscopy, di?erential scanning calorimetry (DSC) analysis, and laser ?ash analysis. The para?n/PS-CNT composite containing 1 wt% CNTs exhibited a thermal conductivity as high as 0.39 Wm-1 K-1, 1.62 fold higher than that of pure para?n. The highly porous structure of the prepared foam led to a high PCM loading of 82.5%, a high latent heat of 119.3 J g-1 and a melting point of 56.88 °C. The prepared composite preserved its stable thermophysical properties after 100 melting/solidi?cation cycles. The enthalpy of para?n increased about 3.5% after in?ltrating into the PS-CNT polyHIPE foam. Further, the composite displayed excellent shape stability, which prevented the leakage of phase change material during phase transitions. Incorporation of carbon nanotubes in the polyHIPE foam led to black color of the composite leading to an increase in the light absorbance e?ciency and especially the light-to-thermal energy conversion e?ciency (90%).
关键词： Phase change material,PS-CNT polyHIPE,Para?n,Thermal energy storage
更新于2025-09-09 09:28:46
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Insight into Reinforced Photocatalytic Activity of CNT-TiO <sub/>2</sub> nanocomposite for CO <sub/>2</sub> Reduction and Water Splitting
摘要： Using titanium dioxide (TiO2) and its modified forms for photocatalytic reduction of CO2 reduction and production of hydrogen are promising routes for providing solutions to the world energy demand in the foreseeable future. Here, we report the synthesis of a series of efficient, stable TiO2 nanoparticles modified with multi-walled carbon nanotubes (CNT) via a simple, combined sonothermal method followed by a hydrothermal treatment. In comparison to bare TiO2, the synthesized CNT-TiO2 photocatalysts showed improved photocatalytic activities for CO2 reduction under UVA as well as under visible light; and water (H2O) splitting under visible light at ambient temperature and pressure. The 2.0CNT-TiO2 has performed the best for methanol, hydrogen and formic acid production from the reduction of CO2 with yield rates of 2360.0, 3246.1 and 68.5 μmol g-1 h-1 under UVA, respectively. Its potential was further tested under visible light for methanol production, 1520.0 μmol g-1 h-1. Also, the highest rate of hydrogen yield from water splitting was 69.41 μmol g-1 h-1 with 2.0CNT-TiO2 under visible light at pH 2. The primary photocatalytic reactions of CNT-TiO2 composites and their intimate structure were studied computationally. It was demonstrated that the binding of CNT to TiO2 nanoparticles are preferable at (101) surfaces compared to (001) facets. Interaction of CNT with TiO2 results in common orbitals within TiO2 band gap that enables visible light excitation of the CNT-TiO2 composites can lead to charge transfer between TiO2 and CNT; while UV light excitation can result in charge transfer in any direction, from CNT to TiO2 and from TiO2 to CNT. The latter process is operative in the presence of sacrificial electron donor TEOA.
关键词： photocatalytic reduction,CO2 reduction,UVA light,water splitting,visible light,CNT-TiO2 nanocomposite,hydrogen production
更新于2025-09-09 09:28:46