改性纳米SiO<sub>2</sub>/PVA复合纤维的制备及重金属离子吸附性能

邢涤扬; 陈广凯; 王克敏; 聂俊

doi:10.13801/j.cnki.fhclxb.20170105.003

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改性纳米SiO₂/PVA复合纤维的制备及重金属离子吸附性能

doi: 10.13801/j.cnki.fhclxb.20170105.003

1.
常州大学材料科学与工程学院, 常州 213164;
2.
北京化工大学理学院, 北京 100029

基金项目: 常州科技局（CE20150011）。

详细信息

通讯作者:
聂俊,教授.研究方向为光聚合,E-mail:Niejun@mail.buct.edu.cn

中图分类号: TQ317
计量
- 文章访问数: 1208
- PDF下载量: 704
- 被引次数: 0
出版历程
- 收稿日期: 2016-11-04
- 刊出日期: 2017-10-15

Removal of heavy metal ions from aqueous solution using amidoxime-functionlized SiO₂/PVA composite nanofibers prepared by sol-gel electrospinning

1.
School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China;
2.
School of Science, Beijing University of Chemical Technology, Beijing 100029, China

摘要

摘要: 通过静电纺丝技术制备酰肟化功能改性的纳米SiO₂/聚乙烯醇（SiO₂/PVA）复合纤维膜。采用SEM、FTIR、DSC和TGA进行表征分析；考察了在水溶液中随pH值和接触时间的变化纤维膜对金属离子吸附效果的影响。研究表明，在pH=6的条件下，纳米纤维对金属离子的吸附最佳，对Cu²⁺、Ni²⁺金属离子的最大吸附量分别为143.7 mg/g和125.1 mg/g，平衡吸附时间为240 min。在纤维膜吸附的前50 min内，SiO₂/PVA纤维膜对Cu²⁺和Ni²⁺金属离子的吸附量为126.8 mg/g和109.8 mg/g，吸附率分别为90.18%和89.92%。通过吸附等温线和吸附方程考察SiO₂/PVA纤维对Cu²⁺和Ni²⁺金属离子的吸附行为。结果显示，复合纤维对两种金属离子的吸附满足拟二级动力学方程，热力学分析表明，吸附过程符合Langmuir单层吸附。使用酸处理纤维膜进行再生吸附试验，发现循环4次试验后，吸附效率达到53%，结果说明复合纤维膜可作为可再生金属离子吸附材料。
- 静电纺丝 /
- 酰肟化改性 /
- 纳米纤维 /
- 吸附剂 /
- 重金属离子
Abstract: Amidoxime-functionalized SiO₂/polyvinyl alcohol(SiO₂/PVA) nanofiber adsorbent was prepared by electrospinning technique. The composite SiO₂/PVA nanofibers was analyzed by SEM, FTIR, DSC and TGA.The nanofiber adsorbent was also evaluated for mental ions adsorption capacity.The results indicate that the highest adsorption occurs at pH=6 and the adsorption capacity can be 143.7 mg/g and 125.1 mg/g for Cu²⁺ and Ni²⁺, respectively. The composite SiO₂/PVA nanofibers can remove almost 90% aforementioned ions from aqueous solutions within 50 min. The kinetic data were analyzed by the pseudo-first-order and pseudo-second-order kinetic model, the kinetic process is found to fit the pseudo-second-order equation and the adsorption isotherm data fit well the Langmuir isothermal model. Furthermore, HNO₃ is found to be effective in regenerating the adsorbent and 53% of the metal ions are removal from the aqueous even in the fourth regeneration/reuse cycle, which imply that the nanofibers can be suitable for water treatment as adsorbent.
- electrospinning /
- amidoxime-functionlized /
- nano fibers /
- adsorbent /
- heavy metal ion