疏水磁多孔Fe_(3)O_(4)@碳质纳米微球用作酸碱协同催化的性能  

Surface hydrophobic magnetic porous Fe_(3)O_(4)@carbonaceous microspheres applicated as heterogeneous acid-base cooperative catalysis

作　　者：徐伟刚[1,2] 张青 雷冲 桂豪冠 XU Weigang;ZHANG Qing;LEI Chong;GUI Haoguan(Department of Medical Technology Management,Changzhou Hygiene Vocational Technology College,Changzhou 213003,China;School of Petrochemical Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州卫生高等职业技术学校医药技术管理系,江苏常州213003 [2]常州大学石油化工学院,江苏常州213164

出　　处：《常州大学学报（自然科学版）》2023年第4期27-36,共10页Journal of Changzhou University：Natural Science Edition

摘　　要：采用水热自组装和表面接枝法制备了具有核-壳式结构的Fe_(3)O_(4)@P-C-SO_(3)H-N纳米材料。其内核由纳米Fe_(3)O_(4)构成,外壳由多孔磺酸基功能化的碳质结构组成,氨基硅烷与碳质表面的有机基团通过表面接枝连接,使材料获得以磺酸基为酸中心,以胺基为碱中心的酸碱协同催化活性,同时具备磁性、多孔性和疏水性等多种性能。Fe_(3)O_(4)@P-C-SO_(3)H-N的各项物理化学性质采用BET,XRD,FT-IR,XPS,Raman,SEM和TEM等技术表征。催化活性实验表明Fe_(3)O_(4)@P-C-SO_(3)H-N在三羟基丙烷与正戊酸的酯化反应和三羟基丙烷三戊酸酯与甲醇的液相酯交换反应中具有良好的催化活性,这归因于介孔结构、碳质壳内的磺酸基、表面胺基和疏水性的协同作用,多孔结构促成致密但均匀的表面活性位点的分布,疏水性表面让油性的反应物更容易和活性位点接触。此外,磁性内核提供了超顺磁性能,能够方便纳米催化剂与反应体系的高效分离。Fe_(3)O_(4)@P-C-SO_(3)H-N was synthesized by hydrothermal self-assembly and surface grafting,which has a typical core-shell structure.The core was nano-sized Fe_(3)O_(4),and the shell was composed of porous sulfonic acid functionalized carbonaceous group.Aminosilane and carbonaceous surface organic group were connected by surface grafting.The Fe_(3)O_(4)@P-C-SO_(3)H-N material has sulfo group acid center with magnetic,porous and hydrophobic properties.The physico-chemical properties of the Fe_(3)O_(4)@P-C-SO_(3)H-N were characterized by BET,XRD,FT-IR,XPS,Raman,SEM and TEM.As a carbonaceous-based materials,Fe_(3)O_(4)@P-C-SO_(3)H-N has excellent catalytic activities in the esterification reaction of trihydroxypropane with valentic acid and the liquid phase transesterification reaction of trihydroxypropane trivalentate with methanol.This results were attributed to the combination of mesporous structure,the sulfonate group within the carbonaceous shell,surface amine group and hydrophobicity,resulting in a dense but uniform distribution of surface active sites that make oleatic reactants more easily in contact with the active sites.In addition,the magnetic core provides super paramagnetic property and facilitates the efficient separation of the nano-catalyst from the reaction system.

关 键 词：Fe_(3)O_(4)@碳质 多孔 磁性 酸碱催化剂 酯化 酯交换 

分 类 号：TQ645.6[化学工程—精细化工]