Synthesis of core–shell structured Ag₃PO₄@benzoxazine soft gel nanocomposites and their photocatalytic performance

Abstract

In photocatalysis investigation, it remains a significant challenge to improve the interface properties and enhance the stability of photocatalysts. To address this challenge, we have prepared the core-shell structured Ag3PO4@benzoxazine soft gel nanocomposites, in which Ag3PO4 nanoparticles are coated with uniform benzoxazine monomers via a facile solution self-assembly method. The benzoxazine monomers are attached to the surface of Ag3PO4 nanoparticles by coordination interaction between the amino group of the benzoxazine monomers and Ag + ions on the surface of Ag3PO4, and the soft gel shell is formed via the interaction of hydrogen bonds between the benzoxazine monomers. The nanocomposites exhibit higher visible-light photocatalytic stability than the bare Ag3PO4 nanoparticles under the same reaction conditions. Both experimental evidences and electrochemical calculations reveal that the high photocatalytic stability of Ag3PO4@benzoxazine soft gel nanocomposites mainly originates from the silver amine complex ion formed in the interface between the core and the shell. The integration of photocatalysts with the advantages of soft gels can provide a new way to improve the interface properties of Ag3PO4 catalyst and facilitate to realize the long-standing goal of performing chemical synthesis using the sunlight.The Ag 3 PO 4 @BSG-30 nanocomposites exhibit a higher visible-light photocatalytic stability than the bare Ag 3 PO 4 nanoparticles.

High‐Performance Vitrimeric Benzoxazines for Sustainable Advanced Materials: Design, Synthesis, and Applications

“…[318] Moreover, silver phosphate-benzoxazine soft gel nanocomposites were developed and found to exhibit photocatalytic performance. [319] The prospect of benzoxazine nanocomposites for advanced industrial applications has led to various research efforts devoted to the understanding of polymerization kinetics of benzoxazine nanocomposites. [320,321] Figure 7.…”

Improved Electrochemical Performance of LiFePO4@N-Doped Carbon Nanocomposites Using Polybenzoxazine as Nitrogen and Carbon Sources

“…The broad peak around 3385 cm –1 is attributed to the OH stretching mode of the phenolic hydroxyl group, − and the absorption peaks of the bands at 2959 and 2854 cm –1 are attributed to the stretching vibrations of CH 2 groups . The characteristic peaks at 1508 and 940 cm –1 correspond to the oxazine ring. − The bands at 1231, 1038, and 1178 cm –1 can be assigned to asymmetric and symmetric stretching of COC and asymmetric stretching of CNC of the benzoxazine structure, respectively. ,, It is noted that the disappearance of peaks at 940, 1038, and 1178 cm –1 and the decrease of the integrated intensity for the bands at 1231 and 1508 cm –1 after curing at 180 °C, indicate that highly cross-linked PBZ was acquired through the thermally activated ring-opening polymerization of the benzoxazine monomer. − These results prove the formation of the benzoxazine monomers and corresponding PBZ.…”

“…33−35 The bands at 1231, 1038, and 1178 cm −1 can be assigned to asymmetric and symmetric stretching of COC and asymmetric stretching of CNC of the benzoxazine structure, respectively. 31,32,35 It is noted that the disappearance of peaks at 940, 1038, and 1178 cm −1 and the decrease of the integrated intensity for the bands at 1231 and 1508 cm −1 after curing at 180 °C, indicate that highly cross-linked PBZ was acquired through the thermally activated ring-opening polymerization of the benzoxazine monomer. 33−35 These results prove the formation of the benzoxazine monomers and corresponding PBZ.…”

“…Our previous work has demonstrated that polybenzoxazine (PBZ), a new class of high performance polymer, has high molecular design flexibility that allows for a variety of molecular structures of desired properties. , The thermoset PBZ resins can be easily prepared from inexpensive raw materials, including various phenols, primary amines, and formaldehyde. − Furthermore, inspired by the existence of nitrogen-heteroatom in PBZ, we can effortlessly achieve in situ nitrogen-doping in carbon through a carbonization process.…”