摘要
以可溶性淀粉为原料,N,N′-亚甲基双丙烯酰胺为交联剂,采用反相悬浮聚合得到了一种交联淀粉微球(CSM),利用扫描电镜、红外光谱仪和X射线衍射仪对其结构进行表征。研究了在不同温度下CSM对Ni2+的静态吸附行为,并根据吸附等温线研究了吸附热力学性质,结果表明:在308～328K和研究的浓度范围内,CSM对Ni2+吸附行为符合Freundlich方程;CSM吸附Ni2+的吸附焓变ΔH、吸附自由能变ΔG、吸附熵变ΔS均为负值,表明吸附是一个自发的、放热的熵减小过程,适当降低温度有利于吸附。热力学性质分析结果表明CSM主要通过物理吸附方式吸附Ni2+。
The cross-linked starch microsphere （CSM） were synthesized from soluble starch by inverse suspension polymerization with N, N＇-methylenebisacrylamide as cross-linking agent. The prepared CSM was characterized by scanning electron micrograph （SEM）, Fourier transform infrared spectroscopy （FT-IR） and X-ray diffraction （XRD）. The static adsorption behavior of Ni^2＋ on prepared CSM was investigated at different temperatures, and the thermodynamic parameters of adsorption process were calculated according to the adsorption isotherms. It shows that the Ni^2＋ adsorption characteristic of CSM conforms to the Freundlich isotherms within the temperature range of 308-328 K and the investigated concentration range. The adsorption thermodynamic parameters including enthalpy change △H, free energy change △G and entropy change △S are all negative, which indicates that the adsorption is spontaneous and is an exothermic process, the entropy of the system decreases in the course of adsorption, and the decrease of temperature would benefit the adsorption process. Thermodynamic calculation and analysis show that the CSM absorbs Ni^2＋ mainly by means of physical adsorption.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2009年第1期23-27,共5页
Journal of Chemical Engineering of Chinese Universities
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项目(02JC05)
关键词
交联淀粉微球
表征
吸附
NI2+
热力学
.2＋cross-linked starch microspheres
characteristic
adsorption
Ni^2＋
thermodynamics
