Green Synthesis of Jujube‐Polysaccharide‐Stabilized Gold Nanoparticles for Reduction of 4‐Nitrophenol

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The preparation of gold nanoparticles (Au NPs) for treatment of organic pollutant has been attracting great interest. Herein, natural jujube polysaccharide (JP) and chloroauric acid were incubated together to prepare jujube polysaccharide stabilized gold nanoparticles (Au n ‐JP NPs). The Au NPs inside of Au n ‐JP NPs had an average particle diameter of 8 to 13 nm. The hydrodynamic size of Au n ‐JP NPs in aqueous solution was about 20 nm, and they had negative charge on their surfaces. Au n ‐JP NPs showed high stability and good dispersibility in aqueous solution. In addition, Au n ‐JP NPs had high catalytic performance in reduction of 4‐NP. The apparent rate constant ( k app ) increased linearly with increasing amount of Au n ‐JP NPs. The normalized apparent rate constant k nor of Au 10 ‐JP NPs was as high as 1027.4 s −1 g −1 , which was higher than that of Au NPs reported in many other literatures. This excellent catalytic performance should be due to the high stability and large specific surface area of Au n ‐JP NPs. More importantly, MTT results demonstrated that Au n ‐JP NPs had high biocompatibility in vitro. The green synthetic Au n ‐JP NPs have great potential applications in catalytic degradation of pollutants in the future.