醋酸纤维素多孔纳米纤维的制备及其吸附性能  

Fabrication of porous cellulose acetate nanofibers and their adsorptivity

作　　者：赵瑨云[1] 江慧华[1] 陈良壁[1] 

机构地区：[1]武夷学院生态与资源工程学院福建省高校绿色化工技术重点实验室,武夷山354300

出　　处：《环境工程学报》2015年第12期5801-5806,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51406141);福建省教育厅JK类项目(JK2012055);南平市科技局项目(N2012Z06(6));国家大学生创新性实验(201210397003)

摘　　要：以丙酮/二氯甲烷(1∶4,v/v)为溶剂,通过电纺制备直径(753±67)nm、孔径(63±11)nm醋酸纤维素(CA)多孔纳米纤维,而以N,N-二甲基甲酰胺/丙酮(1∶2,v/v)为溶剂只能得到直径为(478±98)nm表面光滑无孔纤维。光滑CA膜(MCA)、CA纳米纤维(FCA)和CA多孔纳米纤维(PFCA)对罗丹明B(Rh B)的吸附率分别为8.9%、32.0%和75.2%,PFCA吸附率提高主要因为形成纳米级多孔使纳米纤维的比表面积由3.76 m^2/g增加到68.74 m^2/g。PFCA对Rh B的吸附使用Langmuir和Freundlich等温吸附方程式进行推估。相比较相关系数,Langmuir模型更适合于此体系。PFCA对Rh B的吸附属于单层吸附且吸附过程中化学吸附占主导地位。PFCA对Rh B的最大吸附容量为331.12 mg/g。不同温度下吸附吉布斯自由能(ΔG^0)均为负值,说明该吸附过程是一个自发的过程,焓变(ΔH^0)=-15.90 k J/mol说明吸附反应为放热过程。Porous cellulose acetate nanofibers with diameter of（ 753 ± 67） nm and pore size of（ 63 ± 11）nm were prepared by electrospinning using 1 ∶ 4（ v/v） acetone/DCM（ dichloromethane） as solvent. However,cellulose acetate nanofibers with smooth surface and diameter of（ 478 ± 98） nm were obtained using 1 ∶ 2（ v/v）DMF/acetone as solvent. The absorption rates of CA membrane,CA nanofibers and porous CA nanofibers on Rhodamine B（ Rh B） were 8. 9%,32. 0% and 75. 2%,respectively. This was attributed that specific surface area of porous CA nanofibers increased to 68. 74 m^2/g compared to only 3. 76 m^2/g of CA nanofibers. The adsorption data followed the Langmuir and Freundlich model. But the Langmuir model had better correlation with our system at different temperatures. The adsorption of Rh B on the PFCA belonged to monomolecular layer adsorption and physical adsorption. The maximum theoretical adsorption capacity of Rh B on the PFCA was 331. 12 mg/g. The negative values of ΔG^0at different adsorption temperatures indicate the spontaneous nature. The negative value of ΔH^0（- 15. 90 kJ/mol） revealed that the exothermic nature was existed.

关 键 词：多孔 醋酸纤维素 吸附 水处理 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]