Abstract
In this study, natural polymer material chitosan (CS) and graphene oxide (GO) with large specific surface area were used to prepare a new CS/RGO-based composite hydrogel by using glutaraldehyde (GA) as cross-linking agent. In addition, a CS/GA/RGO/Pd composite hydrogel was prepared by loading palladium nanoparticles (Pd NPs). The morphologies and microstructures of the prepared hydrogels were characterized by SEM, TEM, XRD, TG, and BET. The catalytic performance of the CS/GA/RGO/Pd composite hydrogel was analyzed, and the experimental results showed that the CS/GA/RGO/Pd composite hydrogel had good catalytic performance for degradation of p-nitrophenol (4-NP) and o-nitroaniline (2-NA). Therefore, this study has potential application prospect in wastewater treatment and provides new information for composite hydrogel design.
Highlights
The results show that CS/GA/reduced graphene oxide (RGO)/Pd catalyst has good catalytic performance
The results show that the prepared hydrogel had porous microstructure, large speci c surface area and high thermal stability
The hydrogel network can prevent the aggregation of metal nanoparticles, so CS/GA/RGO hydrogel was used as the carrier for the synthesis of CS/GA/RGO/Pd catalyst in this experiment to increase the contact area between reactants and the catalyst, facilitating the catalysis
Summary
Nitrobenzene-based water pollutants such as pnitrophenol (4-NP) and o-nitroaniline (2-NA) have become an urgent problem to be solved, including being toxic and difficult to degrade.[1,2,3,4,5] Targeting these organic substances, precious metal catalysts are mainly used to react with reducing agents to generate compounds that are less toxic, degradable, and less polluting to water, or non-polluting, thereby achieving the reuse of water resources.[5,6] Precious metal nanoparticles have special optical, catalytic, electrochemical and mechanical properties, so they have potential applications in optics,[7,8,9] catalysis,[10,11,12] microelectronics,[13,14,15] biomedicine[16,17] and many other elds. Such hydrogels have a large number of hydroxyl and carboxyl groups, rich functional
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