Gellan gel beads containing magnetic nanoparticles: An effective biosorbent for the removal of heavy metals from aqueous system

被引：57
作者：
Wang, Xia [1 ]
Zhao, Chuanming [1 ]
Zhao, Peng [1 ]
Dou, Peipei [1 ]
Ding, Yi [2 ]
Xu, Ping [1 ]
机构：
[1] Shandong Univ, State Key Lab Microbial Technol, Jinan 250100, Peoples R China
[2] Shandong Univ, Sch Chem & Chem Engn, Jinan 250100, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2009年 / 100卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Heavy metals; Bioremediation; Nanoparticles; Gellan gum; Biosorbents; HEXAVALENT CHROMIUM; BIOSORPTION; GUM; EQUILIBRIUM; SORPTION;
D O I：
10.1016/j.biortech.2008.10.042
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
This study describes an efficient adsorbent consisting of magnetic Fe3O4 and gellan gum, which couples magnetic separation with ionic exchange for heavy metal removal. Adsorption kinetics analysis showed that the adsorption capacities were in an order of Ph2+ > Cr3+ > Mn2+. Different experimental parameters studies indicated that adsorbent dosage, initial metal concentration, temperature and initial pH played important roles in adsorption process. Additionally, the Freundlich model gave a better fit to the experimental data than the Langmuir model. Chemical analysis of calcium ions released into the bulk solutions demonstrated that carboxyl group is critical for binding Pb2+, Mn2+ and Cr3+. Furthermore, a high desorption efficiency was obtained by sodium citrate. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2301 / 2304
页数：4
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