Page 84 - 《精细化工》2021年第3期
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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。
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