交联淀粉聚合物微球对锌离子的吸附性能  

ADSORPTION PROPERTIES OF CROSSLINKED STARCH POLYMER MICROSPHERES FOR ADSORPTION OF ZINC(Ⅱ)

作　　者：李仲谨[1,2] 赵钤妃[2] 李宜洋[2] 景洁[2] 

机构地区：[1]西京学院,陕西西安710123 [2]陕西科技大学,教育部轻化工助剂化学与技术重点实验室,陕西西安710021

出　　处：《精细石油化工》2012年第3期1-5,共5页Speciality Petrochemicals

基　　金：国家自然科学基金资助项目(50573046);陕西省教育厅产业化培育资助项目(02JC05)

摘　　要：以玉米淀粉为原料,N,N′-亚甲基双丙烯酰胺为交联剂,通过反相悬浮聚合法合成了一种淀粉聚合物微球(CSMs),研究了CSMs对Zn2+的吸附行为,分析了其吸附等温线和热力学性质,并利用傅里叶红外光谱仪、X射线衍射仪和综合热分析仪对淀粉聚合物微球及其吸附产物进行了对比分析,探讨其吸附机理。结果表明:在实验研究范围内,CSMs对Zn2+的吸附等温线同时符合Langmuir和Freundlich等温吸附方程;在不同温度下,CSMs吸附Zn2+的吸附自由能变、焓变、熵变均为负值,表明吸附是自发、放热的熵减小过程,降温有利于吸附;CSMs主要通过物理方式和配位方式吸附Zn2+。The crosslinked starch polymer microspheres（CSMs） were synthesized from corn starch by inverse suspension polymerization with N,N＇-methylenebisacrylamide as crosslinker. The adsorption behavior of CSMs for Zn2＋ was investigated. The kinetics and thermodynamics characteristics were al- so studied. The structures of CSMs before and after adsorption were examined by Fourier transform infrared spectroscopy（FT-IR）, X-ray diffraction （XRD） and thermogravimetric analysis （TGA）, and the mechanism of the adsorption was also discussed. The results show that within the framework of the study, the Langmiur and Freundlich adsorption isotherm equation were suitable for the adsorption characteristic of CSMs for Zn2＋. The free energy change AG, enthalpy change AH, entropy change AS for Zn2＋ adsorbed by CSMs were all negative at different temperatures, indicating that the adsorp- tion is spontaneous, exothermic and entropy decreasing process; the decrease of temperature would benefit the adsorption process. CSMs microspheres adsorbe Zn2＋ mainly through physical adsorption and coordination adsorption.

关 键 词：淀粉聚合物微球 锌离子 热力学 吸附机理 

分 类 号：TQ424.3[化学工程]