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第 26 卷第 4 期 高 校 化 学 工 程 学 报
No.4
Vol.26
2012 年 8 月 Journal of Chemical Engineering of Chinese Universities Aug.
2012
文章编号:1003-9015(2012)04-0674-05 网络出版地址:http://www.cnki.net/kcms/detail/33.1141.TQ.20120606.1505.003.html
弱碱性离子交换纤维对六价铬吸附性能的研究
代立波
1
, 周从章
1,2
, 原思国
1
(1. 郑州大学 化工与能源学院, 河南 郑州 450001; 2. 广东普润环保科技有限公司, 广东 江门 529000)
摘 要:以一种腈纶基弱碱性离子交换纤维为材料,探讨了纤维型式(氯型、氢氧型)对吸附量和再生性能的影响。考
察了溶液 pH、温度对氯型纤维吸附量的影响,并进行相应的动力学实验。结果表明:转为氯型的纤维吸附与再生性能
明显优于相应的氢氧型纤维,该纤维在 pH 2~3 时吸附性能最好,温度越高吸附量越大。吸附过程符合准二级动力学模
型(R
2
>0.998),吸附在 30 min 内基本达到平衡。纤维对六价铬的吸附容量可达 376 mgg
1
(pH = 2,C
0
= 300 mgL
1
),明
显高于国外商品化的 Fiban A-1 离子交换纤维(152.9 mgg
1
);且 经 100 次含铬电镀废水吸附再生循环后,六价铬去除率
与纤维质量基本保持不变。
关键词:腈纶基;弱碱性离子交换纤维;六价铬;吸附;动力学
中图分类号: TQ342.84 文献标识码:A
Cr(VI) Adsorption Properties of Weak Alkaline Ion Exchange Fiber
DAI Li-bo
1
, ZHOU Cong-zhang
1,2
, YUAN Si-guo
1
(1. School of Chemical Engmeering and Energy, Zhengzhou University, Zhengzhou 450001, China;
2. Guangdong Purun Environment Technology Co., Ltd., Jiangmen 529000, China)
Abstract: A kind of PAN-based weak alkaline fiber was synthesized and was used as adsorbent for Cr(VI).
The adsorption capacity and regeneration performance of the prepared counter ion forms (Cl
and OH
) of ion
exchange materials were investigated. Effects of acidity and temperature on Cr(VI) adsorption properties of Cl
form fiber and the corresponding adsorption kinetics were observed. The results show that the static adsorption
capacity and regeneration property of Cl
form fiber are superior to that of the corresponding OH
form fiber.
The maximum adsorption capacity is obtained under pH 2~3 and adsorption capacity increases with the increase of
temperature. It was found that the adsorption kinetic model is consistent with the pseudo-second order kinetic
model (R
2
> 0.998) and the adsorptive equilibrium can be achieved within 30 min. Under the condition of pH 2 and
initial Cr(VI) concentration of 300 mgL
1
, the Cr(VI) adsorption capacity of the fresh ion exchange fiber (376
mgg
1
) is much higher than that of commercial Fiban A-1 ion exchange fiber (152.9 mgg
1
). When it was used as
adsorbent to treat the electroplating wastewater containing chromium, after 100 cycles of adsorption and desorption,
the refreshed functional fiber still keeps excellent adsorption capacity and high removal ratio for Cr (VI).
Key words: PAN-based ; weak alkaline ion exchange fiber; Cr(VI); adsorption; kinetics
1 前 言
六价铬是一种广泛存在于电镀、制革、矿业等行业排放废水中的有毒有害金属离子
[1]
,也是国家十
二五规划计划重点解决的工业废水污染源之一
。六价铬是以铬酸根阴离子形式存在,目前对它的处理方
法主要分为两类:1)将六价铬还原为低毒三价铬后,以 Cr(OH)
3
沉淀形式除去。此法治理费用较低,但
由此产生的固体沉淀则将形成新的污染。2)离子交换方法
[2~4]
对六价铬选择性富集与浓缩。该法可实现水
收稿日期:2011-06-29;修订日期:2011-10-31。网络出版时间:2012-06-06 15:05
项目基金:国家自然科学基金(20574063);教育部高校博士点基金(20104101110005)。
作者简介:代立波(1988-),男,江西抚州人,郑州大学博士生。通讯联系人:原思国,E-mail:yuansiguo2005@yahoo.com.cn