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Soluble g-C3N4 nanosheets: facile synthesis and application in photocatalytic hydrogen evolution
摘要： The high dispersibility and solubility are highly required for the potential applications and development of well-known g-C3N4 material. In this study, a facile hydrothermal treatment and the following vacuum freezing-drying process was developed to synthesize the g-C3N4 nanosheets (ca. 5 nm) with excellent dispersibility and solubility in aqueous solutions. It was found that the melem structures with many hydrophilic groups (-NH2, -OH and -C=O) were formed on the g-C3N4 nanosheet surface, resulting in the formation of soluble g-C3N4 (SCN) nanosheets. Moreover, the SCN nanosheets can be worked as the effective modifier to greatly increase the H2-production performance of conventional g-C3N4 photocatalyst (the resultant sample was referred to SCN/g-C3N4). Photocatalytic results revealed that the SCN/g-C3N4 sample exhibited a remarkably higher H2-production performance than the pure g-C3N4 by a factor of ca. 2. The improved H2-production rate of SCN/g-C3N4 photocatalysts could be primarily ascribed to the introduction of hydrophilic groups, which not only remarkably enhances the dispersibility and hydrophilicity of SCN/g-C3N4, but also work as the interfacial active sites to accelerate the H+-reduction reaction and the rapid formation of H2. The present soluble g-C3N4 nanosheets provide potential various applications in environmental protection and energy conversion fields.
关键词： photocatalysis,H2-evolution,solubility,g-C3N4 nanosheets,dispersibility
更新于2025-09-19 17:15:36
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Magnetic nanocomposite with fluorescence enhancement effect based on amino acid coated-Fe3O4 functionalized with quantum dots
摘要： Multifunctional nanoparticles with magnetic and fluorescent properties have high potential in different areas. A very attractive feature of these nanoparticles is that they can be controlled by an external magnetic field and monitored by fluorescence. For biological applications, the magnetic nanoparticles (MNPs) must be biocompatible and dispersible in water, which requires surface modification. This paper describes the synthesis of Fe3O4 MNPs modified with three amino acids (AA): L-Tryptophan (Trp), L-Phenylalanine (Phe) and L-Tyrosine (Tyr) by a co-precipitation method in a one-step reaction without the use of a spacer agent. The potential of AA as a robust anchor was assessed by binding mercaptopropionic acid (MPA)-coated CdTe quantum dots (QDs) to Fe3O4@AA nanoparticles, leading to a hybrid nanostructure with excellent fluorescent and magnetic properties. In particular, the Fe3O4@Trp@QDs nanocomposite showed a fluorescence enhancement effect due to F?rster resonance energy transfer (FRET) from Trp as energy donor to CdTe@QDs as acceptor. The nanomaterials were characterized by high-resolution transmission electron microscopy (TEM), X-Ray diffraction (XRD), zeta potential, thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), Fourier-transform infrared (FT-IR), UV-visible, and fluorescence spectroscopy. The nanocomposite also presents high stability and good dispersibility in water. This nanomaterial may be potentially used in different biomedical and environmental applications.
关键词： amino acid as anchor,fluorescent enhancement,energy transfer,stability and dispersibility in water,Magnetic and fluorescent nanocomposite,Fe3O4-amino acid-CdTe QD
更新于2025-09-19 17:13:59
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Ionic liquid-mediated functionalization of graphene-based materials for versatile applications: a review
摘要： Industrial applications of the graphene (G) and graphene oxide (GO) can be further explored by making them more dispersible in the aqueous and organic environments. Several attempts have been performed to enhance the dispersity of the G and GO in which surface functionalization is one of the most effective methods. Recently, surface functionalization of G and GO using ionic liquids is gaining particular emphasis because of their high thermal and chemical stability, low volatility, very high ability to dissolve a wide range of compounds and more importantly their environmental-friendly behaviour. The covalent functionalization of G and GO is mostly being achieved by acylation, esterification, isocyanate formation, nucleophilic ring opening, amide formation, and diazotization and cycloaddition reactions. Non-covalent functionalization mostly involves electrostatic forces, hydrogen bonding, π–π interactions, van der Waals interaction and donor–acceptor interactions. Because of their high dipolar nature, ionic liquids strongly interact with the sp2-hydrodized carbon networks of G and GO sheets and make them more dispersible as compared to their native networks. In the present review article, we described the collection of reports available on covalent and non-covalent functionalization of G and GO using ionic liquids and their industrial applications. The ionic liquid-functionalized graphene (G-IL) and graphene oxide (GO-IL) are extensively used in pollutants decontamination, sensing and bio-sensing, lubrication, catalysis, and carbon dioxide capturing and hydrogen production. The G-IL and GO-IL represent an essential class of materials for versatile future applications.
关键词： Dispersibility,Functionalization,Nanomaterials,Ionic liquids,Graphene-based materials,Sustainable chemistry
更新于2025-09-10 09:29:36
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Study on modification effect and mechanism of binary modifier co-modified silicon carbide powder
摘要： Modified silicon carbide powder with high dispersibility was fabricated via using binary modifier— one is γ-mercaptopropyl trimethoxysilane (KH590) and other is tetramethylammonium hydroxide (TMAH) — to co-modified silicon carbide. The viscosity of the slurry fabricated with modified SiC powder, as an important parameter, is to investigate the modification effect. The results showed that the minimum viscosity of 0.52 Pa. s was obtained after SiC powder was reacted with 0.4 wt% KH590 and 1.0 wt% TMAH for 2 h. Meanwhile, Zeta potential absolute value of SiC powder before and after modification were 13 mV to 42 mV respectively, indicating highly dispersibility of modified SiC powder. In addition, the green body with high density of 2.49 g/cm3 was obtained by using the modified SiC powder. Meanwhile, the dispersion mechanism of SiC powder co-modified with KH590 and TMAH was explained in this paper.
关键词： Green body,Silicon carbide powder,Dispersibility,Co-modification,Electrostatic repulsion
更新于2025-09-04 15:30:14