离子液体辅助纳米纤维素吸附剂的制备及其吸附性能

doi:10.11901/1005.3093.2020.017

材料研究学报

2020, Vol. 34

Issue (9): 674-682 DOI: 10.11901/1005.3093.2020.017

研究论文

本期目录 | 过刊浏览

离子液体辅助纳米纤维素吸附剂的制备及其吸附性能

黄健¹(

), 林春香¹, 陈瑞英², 熊万永¹, 温小乐¹, 罗鑫¹

1.福州大学环境与资源学院福州 350108
2.福建农林大学材料工程学院福州 350116

Ionic Liquid-assisted Synthesis of Nanocellulose Adsorbent and Its Adsorption Properties

HUANG Jian¹(

), LIN Chunxiang¹, CHEN Ruiying², XIONG Wanyong¹, WEN Xiaole¹, LUO Xin¹

1. College of Environment & Resources, Fuzhou University, Fuzhou 350108, China
2. College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350116, China

引用本文:

黄健, 林春香, 陈瑞英, 熊万永, 温小乐, 罗鑫. 离子液体辅助纳米纤维素吸附剂的制备及其吸附性能[J]. 材料研究学报, 2020, 34(9): 674-682.
Jian HUANG, Chunxiang LIN, Ruiying CHEN, Wanyong XIONG, Xiaole WEN, Xin LUO. Ionic Liquid-assisted Synthesis of Nanocellulose Adsorbent and Its Adsorption Properties[J]. Chinese Journal of Materials Research, 2020, 34(9): 674-682.

全文: PDF(3150 KB) HTML

摘要:

以脱脂棉纤维素(Cellulose,Ce)为原料，以丙烯酸(AA)和丙烯酰胺(AM)为单体，使用酸性离子液体1-丁基-3-甲基咪唑硫酸氢盐([Bmim]HSO₄)为溶剂和水解催化剂对纤维素进行水解和改性，然后对改性纤维素进行高压均质处理制备出纳米纤维素吸附剂(AA/AM-g-NC)。对AA/AM-g-NC的结构和性能进行表征，并以亚甲基蓝为吸附质研究了对AA/AM-g-NC的吸附性能。结果表明，离子液体辅助高压均质处理脱脂棉后得到纤丝交联网状结构的AA/AM-g-NC吸附剂。这种吸附剂的晶型保持了纤维素Ⅰ型结构，结晶度略有提高；AA/AM-g-NC吸附剂表面接有丙烯酸和丙烯酰胺官能团，对亚甲基蓝的吸附受pH值的影响且为自发放热过程，并符合Langmuir吸附等温式；吸附过程接近准二级动力学方程，由颗粒的内扩散和表面扩散共同控制。

关键词 ：有机高分子材料, 纳米纤维素, 接枝共聚, 吸附剂, 离子液体, 亚甲基蓝

Abstract：

Nanocellulose adsorbent (AA/AM-g-NC) from cotton linter was successfully prepared by high pressure homogenization with the assistance of an ionic liquid. The cotton linter was first swelled, hydrolyzed and grafted with acrylic acid and acrylamide in an ionic liquid (1-butyl-3-methylimidazolium hydrogen sulfate ([Bmim]HSO₄)), and then further treated by high pressure homogenization and finally AA/AM-g-NC was obtained. The AA/AM-g-NC adsorbent was characterized and used as adsorbent to adsorb methylene blue. The results show that after the treatment of high pressure homogenization assisted with hydrolysis and graft in ionic liquid AA/AM-g-NC illustrated as crosslinked net with fibril. The crystalline of AA/AM-g-NC remained as cellulose Ⅰ type, with a little increase in the crystallinity. The appearance of functional group from acrylic acid and acrylamide on the AA/AM-g-NC surface was proved. The sorption process towards methylene blue was pH value dependent, spontaneous, exothermic and followed the Langmuir adsorption isotherm. And the adsorption kinetic is closer to the quasi-second order kinetic equation and controlled by both intraparticle diffusion and surface diffusion.

Key words： organic polymer materials nanocellulose graft copolymerization adsorbent ionic liquid methylene blue

收稿日期: 2020-01-13

ZTFLH:

TQ352

基金资助:国家自然科学基金(21577018);福建省教育厅项目(JAT160059)

作者简介: 黄健，男，1982年生，博士

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链接本文:

https://www.cjmr.org/CN/10.11901/1005.3093.2020.017 或 https://www.cjmr.org/CN/Y2020/V34/I9/674

图1 NC和AA/AM-g-NC的SEM 照片

图2 NC及AA/AM-g-NC的TEM像

图3 Ce、NC和AA/AM-g-NC的红外光谱

图4 NC和AA/AM-g-NC的XRD谱图

图5 纳米纤维素NC和AA/AM -g-NC的XPS图谱以及N1s的高分辨图谱

图6 NC和AA/AM-g-NC处理后C1s、N1s和O1s的XPS图谱

表1 NC和 AA/AM -g-NC元素含量

表2 Ce、NC和AA/AM-g-NC的吸附参数

图7 Ce、NC、AA/AM-g-Ce和AA/AM-g-NC对亚甲基蓝的去除率和吸附容量对比

表3 与文献中纳米纤维素吸附剂对亚甲基蓝吸附性能的比较

图8 pH值对AA/AM-g-NC吸附性能的影响

图9 Langmuir及Freundlich方程拟合图

表4 拟合的Langmuir和Freundlich参数

表5 热力学参数

图10 准一级动力学和准二级动力学拟合曲线

图11 颗粒内扩散反应方程曲线

表6 吸附过程的动力学参数

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