Synthesis of Silver Nanoparticle-Doped MXene/Cellulose Hydrogels for Reduction of 4-Nitrophenol
A series of Ag nanoparticle(AgNP)composite catalysts were obtained via initial preparation of MXene-modified cellulose composite hydrogels and successive in-situ reduction of silver nitrate by MXenes.The re-sultant catalysts were characterized by transmission electron microscopy(TEM),X-ray diffractometer(XRD),X-ray photoelectron spectroscopy(XPS),and inductively coupled plasma spectrometer(ICP-OES).Time-dependent ultraviolet-visible(UV-vis)spectra were invoked to monitor the reduction of 4-nitrophenol,as a model reaction;as such,the effects of MXene contents in the composite hydrogels and Ag contents in the composite catalysts on the catalytic performance were investigated.After the optimal catalyst was obtained,the effects of operational variables,including the amount of sodium borohydride and catalyst dosage,on the catalytic performance were examined.Under the optimal reaction conditions,TOF and Krof the optimal catalyst were as high as 633 h-1 and 1.02 min-1,respectively.Moreover,the conversion of 4-nitrophenol remained 98.2%after the catalyst was reused for 13 times.
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