Synthesis and Visible-Light Photocatalytic N₂/H₂O to Ammonia of Au@CDs Core-Shell Nanocatalyst

Abstract

Synthesis and visible-light photocatalytic N2/H2O to ammonia at atmospheric pressure and room temperature is considered to be the most ideal ammonia synthesis technology. In this study, coal-based carbon dots (CDs) were prepared by H2O2 oxidation method using cheap and ubiquitous coal as the carbon source. Then the gold sol was connected to CDs to obtain a core-shell structure photocatalyst Au@CDs by sodium borohydride (NaBH4) reduction method. While characterizing the material structure, the photocatalytic N2/H2O to ammonia performance of Au@CDs was investigated. The results show that the introduction of CDs in Au @CDs photocatalysts can not only improve the performance of the catalyst to excite carriers in visible light, but also inhibit the recombination of photogenerated electron-hole pairs, promote the charge transport ability and make photogenerated electrons and holes move smoothly to the catalyst surface. Meanwhile, the adsorption and dissociation capacity of N2 on the catalyst surface can be improved, thereby the photocatalytic N2/H2O ammonia synthesis reaction of Au@CDs can proceed smoothly.

Carbon dot composites for bioapplications: a review

“…3D), in which MNPs function as the core, and CDs cover the surface to form the shell. 72 Lastly, MOs are also commonly recognized as important components in the metal–CD composites and they generally form very uniform structures with CDs due to their excellent interactions with CDs 73 (Fig. 3E).…”

“…For instance, in Yan and co-workers’ study, glyoxylic acid-modified CDs (GA-CDs) were used as a FRET ratiometric fluorescent probe for the detection of Cu 2+ in aqueous solution. 388 Similarly, Chen et al also applied cyclam-functionalized CDs as a FRET nanoprobe for the detection of Cu 2+ and S. 2–389 In addition to the above examples, the detection of other important metal ions such as Ag + , Cu 2+ , Cr 6+ , and Pb 2+ has also been successfully realized with CD composite-based sensing platforms. 390–401…”

Preparation of carbon dots-metal nanoparticles nanocomposites and their application in heterogeneous catalysis

“…Therefore, the conversion of N 2 /H 2 O to Ammonia by photocatalysis was concerned. Cui et al prepared CQDs/Au nanocomposite with the chemical reduction method with NaBH 4 reductant (figure 23) [129]. The ammonia yield reached a maximum of 1073.4 µmol l −1 g −1 cat.…”

“…Therefore, the band gap of the nanocomposite catalyst is crucial for its sonocatalytic performance. The band gap energy (Eg) of the Five cycles [129] Figure Synthesis of the catalyst Pd@CDs.…”