季铵型阳离子纤维素对水中腐殖酸的吸附.pdf

第30卷第9期
无机化学学报
Vol 30 No9
2014年9月
CHINESE JOURNAL OF INORGANIC CHEMISTRY
2057-2063
季铵型阳离子纤维素对水中腐殖酸的吸附
吴薇施文健*王精志顾海欣杨琴淋
上海理工大学环境与建筑学院,上海200093)
摘要:以异丙醇为分散剂,碱纤维与3-氯-2-羟内基三甲基氯化铵反应,醚化接枝制得一种环境功能材料一季铵型阳离子纤维素
(QACC)。用红外光谱、X-射线行射和电镜扫描对材料的结构进行了表征:红外光谱中1644cm1处存在明显的季侒基的弯曲振
动。经过改性的QACC结晶度下降,比表面积增加。研究了QACC对腐殖酸的吸附性能:pH-8、318K时,QACC对腐殖酸的饱和
吸附容量为622mgg21;其表观活化能为6.45kJ?mol';吸附符合 Lagergren二级动力学方程,吸附速率随温度升高而加快:吸
附等温模型符合 Langmuir等温式,为单分子层吸附;吸附腐殖酸的△H、△S、△G分別为:317kJ·mol、119J·mol+K1、-5.34kJ
mol,吸附主要为化学吸附。
关键词:季侒型阳离子纤维素;腐殖酸;表征;动力学;热力学;吸附机理
中图分类号:0613.42文献标识码:A文章编号:1001-4861(2014)09-2057-07
DOI:10.11862/CJIC.2014.297
Adsorption of Aqueous Humic Acid on QACC
WU Wei SHI WEN-JIAN"WANG Jing-zhi GU Hai-xin YANG Qin-lin
(School of Eneironment and A rchitecture, University of Shanghai for Science and Technology, Shanghai 200093, China)
Abstract: Quarternary ammonium cation cellulose (QACC)was synthesized by using 3-chloro-2-hydroxypropy-
Trimethylammonium chloride as etherifying agent with isopropyl alcohol as dispersing media. The
e synthesize
QACC was characterized by IR, XRD and SEM and was used for adsorption of humic acid, a precursor of
disinfection by-products, from aqueous solution. The R results show that the bending vibration peak of R\"at
1 637 cm is obviously present, confirming that QACC is the target product. XRD and SEM results indicate a
decreased crystallinity and an increased surface area of QACC caused by the etherification. The adsorption
results reveal that the saturation humic acid adsorption capacity is 622 mgg at 318 K under PH value of 8
Furthermore, the adsorption process is fitted with pseudo-second-order kinetics model and the adsorption rate
increases with increase of temperature. The apparent activation energy of the adsorption is 6.45 KJmol". The
adsorp ion pattern fitted Langmuir isotherms(monomolecular layer adsorption).AH, AS and AG of the adsorption
were 31. 7 kjmol, 119 Jmol-lK-and -5.34 kjmol ,respectively. The results also show that the adsorption
is mainly chemical adsorption
Key word: QACC; humic acid; characterization; kinetic; thermodynamics; adsorption mechanism
子聚合物,大多数淡水中的含量为1~12mg:L。自
来水厂氯化消毒过程中,腐殖酸与消毒剂发生反
腐殖酸(HIA)是一种广泛存在的天然有机高分应,将会生成多种消毒副产物,该类物质进人人体
收稿日期:2014-04-03。收修改稿日期:201405-25。
国家自然科学基金(。.10872133资助项目。
*通讯联系人。E-mail:vii@usst.edu.cn