Preparation of Nano-Au/Sulfur-Containing Cellulose Composite Catalysts for Catalytic Reduction of Organic Pollutants
A series of Au nanoparticles(AuNPs)/sulfur-containing cellulose composite materials were pre-pared by a process involving modification of cellulose using lipoic acid,adsorption of chlorauric acid,and reduction of chlorauric acid by sodium borohydride.Successively,the resultant composite materials were subjected to thermal and oxidative treatments,yielding ultimate AuNP/cellulose composite catalysts.Structures/components of the ob-tained composite catalysts were characterized by powder X-ray diffraction(XRD),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),and inductively coupled plasma spectrometer(ICP-AES).It was found that the oxidative treatments resulted in elevated Au contents on the surface of supports.During the re-duction of 4-nitrophenol(4-NP),the composite catalysts after the oxidative treatments showed good catalytic per-formances.When the dosage of 4-NP was 3 mL,the molar ratio of sodium borohydride to 4-NP was 400∶1,and the dosage of catalyst was 3 mg,the catalyst with an Au content of 2%displayed a reaction rate constant Kr as high as 1.941 min-1 and could be reused for 4 times.Also,the above catalysts showed good catalytic performances in reduc-ing azo/heterocyclic dyes.
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