Page 84 - 《精细化工》2021年第3期
P. 84
第 38 卷第 3 期 精 细 化 工 Vol.38, No.3
202 1 年 3 月 FINE CHEMICALS Mar. 2021
功能材料
CA@CS-MMT 复合纳米纤维的制备及
对 Cr(Ⅲ)的吸附
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张 静 ,薛朝华 2,3* ,马宏瑞 ,高 静 ,苏 哲
(1. 陕西科技大学 环境科学与工程学院,陕西 西安 710021;2. 陕西科技大学 轻工科学与工程学院,
陕西 西安 710021;3. 陕西科技大学 轻化工程国家级实验教学示范中心,陕西 西安 710021)
摘要:采用静电纺丝结合溶液插层法制备了醋酸纤维素@壳聚糖改性蒙脱土(CA@CS-MMT)复合纳米纤维,
并用于水中 Cr(Ⅲ)的吸附。通过 SEM、TEM、FTIR 及 XRD 对复合纳米纤维的结构与性能进行了表征,考察了
CS-MMT 含量、pH、温度、吸附剂用量及 Cr(Ⅲ)初始质量浓度对吸附效果的影响。结果表明,CS-MMT 的加入
使纳米纤维的平均直径由 320 nm 下降至 180~210 nm,当 CS-MMT 含量为 CA 质量的 2%时,蒙脱土片层在纤
维内部形成连续结构,制备的 CA@CS-MMT-2 对水中 Cr(Ⅲ)具有良好的吸附性能,在 25 ℃,pH 为 5.5±0.1,
Cr(Ⅲ)初始质量浓度为 50 mg/L,吸附剂用量为 0.2 g/L 时,拟合最大吸附量可达 144.93 mg/g;吸附剂投加量为
0.4~1.0 g/L 时,可将水中 Cr(Ⅲ)的质量浓度由 10 或 20 mg/L 降低至 1.5 mg/L 以下。该吸附过程符合 Langmuir
等温吸附和准二级动力学方程,循环 3 次后 Cr(Ⅲ)吸附量仍可达 99.13 mg/g。
关键词:静电纺丝;溶液插层;蒙脱土;壳聚糖;醋酸纤维素;三价铬;功能材料
中图分类号:X703;TQ340.64;O647.3 文献标识码:A 文章编号:1003-5214 (2021) 03-0504-08
Fabrication of cellulose acetate@chitosan-montmorillonite
composite nanofibers and its adsorption of Cr(Ⅲ)
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ZHANG Jing , XUE Chaohua 2,3* , MA Hongrui , GAO Jing , SU Zhe
(1. School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021,
Shaanxi, China; 2. College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science &
Technology, Xi'an 710021, Shaanxi, China; 3. National Demonstration Center for Experimental Light Chemistry
Engineering Education, Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi, China)
Abstract: Cellulose acetate@chitosan modified montmorillonite composite nanofibers (CA@CS-MMT)
were prpepared by electrospinning and solution intercalation. The structure and properties of the composite
nanofibers were characterized by SEM, TEM, FTIR and XRD. And the adsorption properties of CA@
CS-MMT nanofibers for Cr (Ⅲ) in water were studied. The results showed that the average diameter of
nanofibers decreased from 320 nm to 180~210 nm with the increase of CS-MMT content. When the content
of CS-MMT was 2% of the mass of cellulose acetate (CA), the lamellar structure of CS-MMT was
assembled with CA to form the continuous structure in the CA@CS-MMT-2 composite nanofibers. The
fitting maximum adsorption capacity of CA@CS-MMT-2 composite nanofiber was 144.93 mg/g under the
conditions of pH=5.5±0.1, 25 ℃, initial mass concentration of Cr (Ⅲ) of 50 mg/L and dosage of
adsorpbent of 0.2 g/L. Importantly, when the dosage of adsorbent was 0.4~1.0 g/L, the Cr (Ⅲ) mass
concentration could decrease from 20 or 10 mg/L to below 1.5 mg/L. The adsorption process was in
accordance with Langmuir isothermal adsorption model and the adsorption kinetics conformed to
pseudo-second-order kinetics equation. The adsorption capacity was still 99.13 mg/g after three cycles.
Key words: electrospinning; solution intercalation; montmorillonite; chitosan; cellulose acetate; trivalent
chromium; functional materials
收稿日期:2020-07-27; 定用日期:2020-10-13; DOI: 10.13550/j.jxhg.20200695
基金项目:国家自然科学基金(51372146,51572161);水污染控制重大专项(2017ZX07602-001)
作者简介:张 静(1980—),女,讲师,E-mail: 276056849@qq.com。联系人:薛朝华(1974—),男,教授,E-mail:xuech@zju.edu.cn。