Catalytic Decomposition Of Flavonoid-o-glucoside Over Graphene Oxide

Graphene oxide(GO)is a novel carbon material with weak acidity,amphilicity and.etc.GO can be used as highly-efficient and green solid catalyst with weak acidity due to its unique layered structure,large specific surface area and amount of oxygen containing functional groups.In this paper,we have synthesized GO as acid catalyst for catalytic decomposition of flavonoid-O-glucoside and investigated the catalytic performance.We also have characterized the structure and property of the GO via various techniques,optimized the reaction parameters,as well as explored the mechanisms and kinetics.The results are as follows:1.GO was synthesized using a variety of modified hummers method,GO as catalyst for catalytic decomposition of hesperidin(HPD)for the first time,comparative analysis of the catalytic effect of the GO,The GO stucture were analyzed using XRD,elemental analysis,FT-IR and XPS,The results showed that the GO load amount of oxygen containing functional groups(such as-OH?-COOH and SO3H),the interlayer spacing of the GO about 0.93 nm,the density of-SO3 H of 0.90mmol/g,the composition of GO of CH0.06876O1.4057S0.07330;hesperidin-7-beta-D-glycosidase(HBG)and hesperetin(HPT)is main products of decomposition of HPD,The decomposition reaction conditions of HPD were optimized and the reaction kinetics were studied;At the anhydrous methanol as solvent,dosage of GO of 40 mg,reaction time of 8 h and reaction temperature of 75?,the highest conversion of HPD of 89.24%,the highest yield of HBG of 10.24%,the highest yield of HPT of 57.18%;decomposition reaction of HPD can be assumed to be two parallel reaction,the reaction follows first-order rate kinetics.2.GO was synthesized through to the hummers method ? modified hummers method and hummers method of optimized,The GO stucture and composition were comparison analyzed using XRD,elemental analysis,FT-IR and XPS,The results showed that the the GO was synthesized using optimized hummers method has highest degree of oxidation and highest content of-SO3 H,the interlayer spacing of the GO about 1.02 nm,the composition of the GO for CH0.06733O1.5644S0.1020,the density of-SO3 H for 1.17mmol/g,GO as catalyst for catalytic decomposition of naringin,The results showed that the GO was synthesized using optimized hummers method has best catalytic effect,The decomposition reaction conditions of naringin were optimized and the reaction kinetics were studied.At the ethanoll as solvent,dosage ofGO of 60 mg,reaction time of 12 h and reaction temperature of 80 ?,the highest conversion of naringin of 87.35%,the highest yield of prunin of 15.97%,the highest yield of naringenin of 59.27%,the decomposition reaction of naringin follows first-order rate kinetics.