Preparation of multi-amine-grafted mesoporous silicas and their application to heavy metal ions adsorption

被引：126

作者：

Zhang, Lingxia ^{[1
]}

Yu, Chichao ^{[1
]}

Zhao, Wenru ^{[1
]}

Hua, Zile ^{[1
]}

Chen, Hangrong ^{[1
]}

Li, Lei ^{[1
]}

Shi, Jianlin ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance & Superfine Micros, Shanghai 200050, Peoples R China

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2007年 / 353卷 / 44-46期

基金：

中国国家自然科学基金;

关键词：

nano-composites; organic-inorganic hybrids;

D O I：

10.1016/j.jnoncrysol.2007.06.018

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Single amine-, double amine- and trinal amine-grafted mesoporous silica SBA-15 (denoted as 1N-SBA-15, 2N-SBA-15 and 3N-SBA-15) have been synthesized by refluxing SBA-15 and gamma-aminopropyltriethoxysilane (APTS), N-[3-(trimethoxysilyl)-propylethylene]diamine (TPED) and trimethoxysilyl propyl diethylenetriamine (TPDT), respectively, in dry toluene under nitrogen atmosphere. These adsorbents could remove the metal ions of Pb2+, Cu2+, Cd2+, Zn2+ as well as Hg2+ rather completely. Thus these adsorbents will be a better choice when more than one kind of metal ions needs to be removed. From IN-SBA-15 to 3N-SBA-15, their adsorption capacities for Hg2+ increase from 382 mg/g to 726 mg/g, which can be attributed to not only the large content of amino groups but also the rather increased steric freedom and accessibility of the functional groups in the large pore channels of SBA-15. The Hg/N ratio decreases with the increase of N numbers. A decrease about 20-47% of adsorption capacity of regenerated samples has been obtained and could be attributed to the N loss in concentrated acid. In addition, the fresh dry samples were found to show much higher adsorption capacity than the aged ones due to the competitive adsorption between atmosphere moisture and the metal ions on the amino groups. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：4055 / 4061

页数：7

共 21 条

[1] 1-allyl-3-propylthiourea modified mesoporous silica for mercury removal [J].