磁性壳聚糖去除水中腐殖酸的研究.pdf

第26卷第10期
无机化学学报
Vol26 No 10
2010年10月
CHINESE JOURNAL OF INORGANIC CHEMISTRY
1761-1767
磁性壳聚糖去除水中腐殖酸的硏究
王家安12郑寿荣1刘风玲1刘景亮唐亮1许昭怡*1
(南京大学环境学院污染控制与资源化研究国家重点实验室,南京210093)
(陕画科技大学资源与环境学院,西安710021)
摘要:采用高温水热法合成了磁性壳聚糖,并研究了其对水中腐殖酸(HA)的吸附、脱附行为。表征结果表明,磁性壳聚糖粒径大
小为200-300nm,氨基含量1.29mol·g',BET比表面积36.00m2-g2,饱和磁化强度为38.78emu?g2,易于磁性分离。HA在磁
性壳聚糖上的吸附等温线可用 Freundlich方程模拟,吸附动力学符合拟二级动力学方程。HA的吸附量随溶液pH值的升高而
降低,随不同阳离子浓度增加而增加,不同类型的阳离子对HA吸附效果影响的大小顺序为:Ca2->Mg3>Na>K?。经5个脱附再
生循环,磁性壳聚糖仍能保持79.8%的吸附量,表明该吸附剂再生性好,可循环使用
关键词:磁性壳聚糖;吸附;腐殖酸;冉生
中图分类号:O614.81*1文献标识码
文章编号:1001-4861(2010)10-1761-07
Removal of Aqueous Humic Acid by Magnetic Chitosan Microspheres
WANG Jia-hong 2 ZHENG Shou-rong LIU Feng-ling LIU Jing-liang
TANG Liang XU Zhao-yi
( State Key Laboratory of Pollution Control and Resource Reuse, and School of the Environment
Nanjing University, Nanjing 210093)
( College of Resource and Enuironment, Shaani University of Science Technology, Xi'an 710021
Abstract: Magnetic chitosan microspheres were synthesized by hydrothermal method and its adsorption and
desorption behavior for humic acid (HA )was also investigated. Characterized results showed that magnetic chitosan
spheres have the diameter of 200-300 nm, amino content of 1.29 mmol. g, BET specifi
ed surface area o
36.00 g", magnetization of 38.78 mu , and the adsorbent was easy to separate at extemal magnetic field
Magnetic chitosan microspheres can greatly remove the aqueous HA, and adsorption isotherm of HA can be fitted by
Freundlich equation. The pseudo-second-order kinetics can fit the adsorption data greatly. HA adsorption amount
over adsorbent decreased with the increasing of solution PH, and increased with increasing of cation concentration
The effect of different cations was in the order of Ca>Mg >Na>K*. HA saturated adsorbent can be regenerated in
alkaline solution. Adsorption amount of HA after five successive adsorption-regeneration cycles was 79.8% of the
initial one, which indicated that adsorbent can be recycled
Key words: magnetic chitosan microsphere; adsorption; humic acid; regeneration
HA是天然水体中一类重要有机物,也是天然有“致癌、致畸、致突变”作用的副产物,如三氯甲烷、
有机物CNOM的重要成分。HA不仅会造成严重的膜氯代酚、氯代醛、氯代硐等,对人体健康构成严重威
污染,还会与饮用水氯消毒剂反应产生各种对人体胁,因此成为饮用水源微污染控制的重点对象1?。
收稿日期:2010-04-30。收修改稿日期:2010-06-03。
国家重点基础研究发展计划(9732008CB418003)、国家自然科学基金(20877039、4040202)和江苏省自然科学基金(SBK201040050资助
项目。
通讯联系人。E-mailZhaoyixu(@mju.edu.cn.Tel:(025)83595831
第一作者:王家宏,男,31岁,博士研究生;研究方向:环境功能材料。