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

• 作者: D. Wang J. Li K. L. Hohn L. Pe?a X. S. Sun
• 来源期刊: 生物材料与纳米技术(英文)
• 学科: 化学
• 关键词: Surface NANOPARTICLES CELLOBIOSE HYDROLYSIS
• 年，卷（期）: 2014,（4）
• 页码范围: 241-253
• 页数: 13页
• 分类号: O6

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.