Synthesis of Propyl-Sulfonic Acid-Functionalized Nanoparticles as Catalysts for Cellobiose Hydrolysis  

作　　者：L.Pena K.L.Hohn J.Li X.S.Sun D.Wang 

机构地区：[1]Department of Biological and Agricultural Engineering,Kansas State University,Manhattan,USA [2]Department of Chemical Engineering,Kansas State University,Manhattan,USA [3]Department of Chemistry,Kansas State University,Manhattan,USA [4]Department of Grain Science and Industry,Kansas State University,Manhattan,USA [5]Department of Agricultural and Biological Engineering,Pennsylvania State University,State College,USA

出　　处：《Journal of Biomaterials and Nanobiotechnology》2014年第4期241-253,共13页生物材料与纳米技术（英文）

基　　金：funded by NSF award CNET1033538;NSF EPSCoR Kansas Center for Solar Energy;supported by National Science Foundation Grant:From Crops to Commuting:Integrating the Social,Technological,and Agricultural Aspects of Renewable and Sustainable Biorefining(I-STAR),NSF Award No.DGE-0903701.

摘　　要：Functionalization of silica surfaces using organo-silanes is highly sensitive to reaction conditions. Silica-coated nanoparticles were functionalized with propyl-sulfonic acid groups (PS) under different synthesis conditions including, various solvents (Ethanol, methanol, acetonitrile, and toluene), water content in the reaction media (0% to 50%), 3-mercaptopropyl-trimethoxysilane concentration (MPTMS) (0.5% to 10%), and reaction time (6 to 16 h). Size of the PS-nanoparticles was determined by TEM and varied from 3.5 to 20.3 nm with sulfur load. Elemental analysis revealed sulfur contents from 0.8% to 22%. FTIR analysis showed increased C-H band intensities with increasing sulfur content of PS-nanoparticles. Although PS-nanoparticles with sulfur loads under 3% did not improve the hydrolysis of cellobiose, PS acid-functionalized nanoparticles with about 6% S achieved 96.0% cellobiose conversion. The control experiment, without catalyst, converted 32.8% of the initial cellobiose. PS-nanoparticles with (6% - 8% S) were obtained using (0.5%) silane concentration and 15 - 16 h reaction time in ethanol.Functionalization of silica surfaces using organo-silanes is highly sensitive to reaction conditions. Silica-coated nanoparticles were functionalized with propyl-sulfonic acid groups (PS) under different synthesis conditions including, various solvents (Ethanol, methanol, acetonitrile, and toluene), water content in the reaction media (0% to 50%), 3-mercaptopropyl-trimethoxysilane concentration (MPTMS) (0.5% to 10%), and reaction time (6 to 16 h). Size of the PS-nanoparticles was determined by TEM and varied from 3.5 to 20.3 nm with sulfur load. Elemental analysis revealed sulfur contents from 0.8% to 22%. FTIR analysis showed increased C-H band intensities with increasing sulfur content of PS-nanoparticles. Although PS-nanoparticles with sulfur loads under 3% did not improve the hydrolysis of cellobiose, PS acid-functionalized nanoparticles with about 6% S achieved 96.0% cellobiose conversion. The control experiment, without catalyst, converted 32.8% of the initial cellobiose. PS-nanoparticles with (6% - 8% S) were obtained using (0.5%) silane concentration and 15 - 16 h reaction time in ethanol.

关 键 词：Surface NANOPARTICLES CELLOBIOSE HYDROLYSIS 

分 类 号：O6[理学—化学]