介孔α-Fe_2O_3表面配合反应平衡常数测定  

Surface Complexation Constants of Mesoporous Fe_2O_3

作　　者：吴震生[1] 张卫民[1] 孙中溪[1] 

机构地区：[1]济南大学化学化工学院,济南250022

出　　处：《化学学报》2010年第8期769-774,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20677022);国家自然科学重点基金(No.20537020)资助项目

摘　　要：采用十二胺为模板剂、氨水做沉淀剂成功制备了介孔α-Fe2O3,通过粉末X射线衍射(XRD)、透射电镜(TEM)、N2吸附/脱附技术对样品晶相、形貌和比表面积进行了表征.根据介孔α-Fe2O3悬浮液的酸碱滴定数据,使用FITEQL软件,采用双电层恒电容模型计算得出了介孔α-Fe2O3的表面酸碱反应平衡常数.在此基础上研究了Cu2+,Pb2+,Zn2+在介孔氧化铁表面的吸附行为,使用WinSGW软件模拟得出了相应的表面配合反应平衡常数并讨论了其吸附机理.Mesoporous Fe2O3 nanoparticles were synthesized using dodecyl amine as a template and ammonia as a precipitant.Powder X-ray diffraction （XRD）,transmission electron microscopy （TEM）,and nitrogen adsorption-desorption analysis methods were used to characterize the crystallinity,morphology and the specific surface area.According to the experimental data of acid base titration of mesoporous α-Fe2O3 suspension,using FITEQL software and Constant Capacitance Model （CCM）,the protonation and deprotonation constants of mesoporous α-Fe2O3 were determined.Base on the acid-base constants the adsorption of heavy metal ions （Cu^2＋,Pb^2＋,Zn^2＋） at the surfaces of mesoporous Fe2O3 was studied as a function of pH.The surface complexation constants of Cu^2＋,Pb^2＋,Zn^2＋at the surfaces were determined using WinSGW software and the reaction mechanism was discussed as well.

关 键 词：介孔氧化铁 重金属离子 酸碱性质 表面配合 

分 类 号：O643.1[理学—物理化学]