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Nitrogen-Doped Carbon Quantum Dots-Decorated Mg-Al Layered Double Hydroxide Supported Gold Nanocatalysts for Efficient Base-free Oxidation of Benzyl Alcohol
摘要： A nitrogen-doped carbon quantum dots (NCDs)-decorated Mg-Al layered double hydroxide (MgAl-LDH) supported gold nanoparticles (NPs) was employed in the aerobic oxidation of benzyl alcohol under solvent-free and base-free conditions. Comprehensive characterizations revealed that the decoration of NCDs improved surface basicity of NCD/MgAl-LDH and was beneficial to the stabilization of gold NPs. Compared with MgAl-LDH supported gold catalyst, Au/NCD/MgAl-LDH showed much better catalytic activity, along with a turnover frequency of about 20175 h-1 for benzyl alcohol conversion. The promoted catalytic efficiency of the NCD/MgAl-LDH supported Au catalyst was mainly corelated with unique cooperation between surface hydroxyl arrays at the brucite-like lattice of MgAl-LDH matrix and highly dispersed NCDs, thereby favoring the adsorption and activation of alcohol hydroxyls. Furthermore, compared with Au/MgAl-LDH, Au/NCD/MgAl-LDH showed better structural stability, due to the strong Au-NCDs interactions. The primary finding opens a promising approach to develop other highly efficient metal-base catalysts applied in various base-catalyzed heterogenous reactions.
关键词： Surface metal-base cooperation,Layered double hydroxide,Au nanoparticles,Nitrogen-doped carbon quantum dots,Oxidation
更新于2025-09-12 10:27:22
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Paper sensor of curcumin by fluorescence resonance energy transfer on nitrogen-doped carbon quantum dot
摘要： Paper Sensor detection methods are attractive in wide analytical applications. Presented herein is a paper sensor and ?uorescence methods that was ?rstly developed to detect curcumin (Cur) based on ?uorescence resonance energy transfer (FRET) between nitrogen-doped carbon quantum dots (NCQDs) and Cur. The facile ?uorescent method was demonstrated to detect Cur in the range of 0e2600 mM with a detection limit of 0.13 mM. And facile paper sensor of Cur was fabricated and displayed at concentration of 0 mM, 100 mM, 200 mM, 300 mM, 400 mM, 500 mM and 600 mM, respectively. In additions, it was realized for determination of Cur in real samples including orange juice and curry solution. Compared with the reported methods, the present method is simple, rapid and sensitive for detecting Cur.
关键词： Nitrogen-doped carbon quantum dots (NCQDs),Curcumin (Cur),Fluorescence resonance energy transfer (FRET),Paper-based sensor
更新于2025-09-11 14:15:04