Gellan gel beads containing magnetic nanoparticles: an effective biosorbent for the removal of heavy metals from aqueous system.
Gellan gel beads containing magnetic nanoparticles: an effective biosorbent for the removal of heavy metals from aqueous system.
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DOI：
10.1016/j.biortech.2008.10.042
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发表时间：
2009-04
影响因子：
11.4
通讯作者：
Xia Wang;Chuanming Zhao;Peng Zhao;Peipei Dou;Yi Ding;P. Xu
中科院分区：
文献类型：
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作者：
Xia Wang;Chuanming Zhao;Peng Zhao;Peipei Dou;Yi Ding;P. Xu
本研究描述了一种由磁性Fe3O4和结冷胶组成的高效吸附剂，它将磁分离与离子交换耦合用于去除重金属。吸附动力学分析表明，吸附量大小顺序为Pb2+>Cr3+>Mn2+。不同实验参数的研究表明，吸附剂投加量、金属初始浓度、温度和初始pH值对吸附过程有重要影响。此外，Freundlich模型比Langmuir模型更好地拟合实验数据。释放到本体溶液中的钙离子的化学分析表明，羧基是关键的结合Pb 2+，Mn 2+和Cr 3+。此外，柠檬酸钠获得了高的解吸效率。
This study describes an efficient adsorbent consisting of magnetic Fe3O4and 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 Pb2+>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.