Chemical modification of silica-gel with diethylenetriamine via an end-group protection approach for adsorption to Hg(II)

被引：60
作者：
Zhang, Ying [1 ]
Qu, Rongjun [1 ]
Sun, Changmei [1 ]
Wang, Chunhua [1 ]
Ji, Chunnuan [1 ]
Chen, Hou [1 ]
Yin, Ping [1 ]
机构：
[1] Ludong Univ, Sch Chem & Mat Sci, Yantai 264025, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2009年 / 255卷 / 11期
关键词：
Chemical modification of silica-gel; Diethylenetriamine; End-group protection; Adsorption; Hg(II); HEAVY-METAL IONS; SEPARATION; ETHYLENIMINE; DENDRIMER; NITROGEN; REMOVAL; CATIONS; SURFACE; ROUTES; AGENT;
D O I：
10.1016/j.apsusc.2009.01.011
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Four kinds of silica-gel supported diethylenetriamine adsorbents with different structures, were prepared by so-called "heterogeneous-direct-amination'' (hetero-DA), "homogeneous-direct-amination'' (homo-DA), "heterogeneous end-group protection'' (hetero-EGP), and "homogeneous end-group protection'' (homo-EGP) methods, respectively. The obtained products were named SG-HE-dD, SG-HO-dD, SG-HE-pD and SG-HO-pD, respectively (where SG means silica-gel; HE means heterogeneous, HO means homogeneous, d means direct, p means protected and D means diethylenetriamine). Their structures were characterized by FT-IR, elemental analysis, porous structure analysis and thermogravimetric analysis. The adsorption capabilities of such adsorbents towards Hg(II) were studied and evaluated by static method. SG-HE-pD and SG-HO-pD showed higher performance towards Hg(II) adsorption than corresponding counterparts SG-HE-dD and SG-HO-dD, even though the former two possessed lower contents of diethylenetriamine (DETA). The kinetics data indicated that the adsorption process was governed by the film diffusion and followed pseudo-first-order rate model for SG-HE-dD, SG-HO-dD and SG-HE-pD and pseudo-second-order model for SG-HO-pD. The Langmuir model was applied to fit the experimental equilibrium data for all adsorbents. The end-group protection method exhibited its advantage in preparation of effective adsorbent for metal ions uptake compared to the direct-amination method. (C) 2009 Elsevier B. V. All rights reserved.
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页码：5818 / 5826
页数：9
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