Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第6期    总第171期    2013年6月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1004-0609(2013)06-1661-05
纳米SiO2空心微球对重金属离子的吸附特性
刘 纯1, 2,殷恒波2,石莉萍1,王爱丽2,吴占敖3,吴 刚3,姜 涛3,沈玉堂2,姜廷顺2

(1. 北华大学 化学与生物学院,吉林132013;
2. 江苏大学 化学化工学院,镇江 212013;
3. 中国人民解放军第359医院,镇江 212001
)

摘 要: 选用具有高比表面、强吸附能力的二氧化硅纳米空心微球作吸附剂,对Pb2+、Cu2+及Cr3+的吸附性能进行测试。利用Langmuir 线性方程对吸附平衡数据进行拟合。结果表明:二氧化硅纳米空心微球对重金属离子具有较高的饱和吸附量,分别为1.256、0.681、0.563 mmol/g。饱和吸附量与重金属离子的共价指数及电荷密度有很强的相关性,随着共价指数增加或电荷密度的降低,饱和吸附量增大;吸附常数与重金属离子电场强度(有效核电荷数)有关,随着有效核电荷数的增加,吸附常数增大。此吸附过程具有化学吸附特征,再生的吸附剂可以重复使用。

 

关键字: 纳米SiO2空心微球;重金属离子吸附;Langmuir 线性方程

Adsorbability characteristic of hollow SiO2 nanospheres for heavy metal ions
LIU Chun1, 2, YIN Heng-bo2, SHI Li-ping1, WANG Ai-li2, WU Zhan-ao3, WU Gang3, JIANG Tao3, SHEN Yu-tang2, JIANG Ting-shun2

1. School of Chemistry and Biology, Beihua University, Jilin 132013, China;
2. Faculty of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China;
3. Chinese PLA 359 Hospital, Zhenjiang 212001, China

Abstract:The adsorbability of hollow SiO2 nanospheres of high adsorption capacity and large specific surface area for Pb2+, Cu2+, and Cr3+ ions was investigated. The absorbtion equilibrium data were fitted by Langmuir linear equation. The results show that hollow SiO2 nanospheres have high adsorption capacity for heavy metal ions, the adsorption capacities for Pb2+, Cu2+ and Cr3+ ions are 1.256, 0.681, and 0.563 mmol/g, respectively. As the fitting data shown, there is a strong correlation between the adsorption capacity and ion characteristics (covalent index and charge density). The adsorption capacity increases with the increase in covalent index or decrease in charge density. The adsorption constant is related to electric field intensity of ion (effective nuclear charge), and the adsorption constant increases with the increase in effective nuclear charge of ion. This adsorption process should belong to chemisorption. The regenerated adsorbent can be reused many times.

 

Key words: hollow SiO2 nanosphere; heavy metal ion adsorbtion; Langmuir linear equation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f-ysxb@mail.csu.edu.cn