Wang Xia, Zhao Chuanming, Zhao Peng, Dou Peipei, Ding Yi, Xu Ping
State Key Laboratory of Microbial Technology, Shandong University, Jinan, PR China.
Bioresour Technol. 2009 Apr;100(7):2301-4. doi: 10.1016/j.biortech.2008.10.042. Epub 2008 Dec 6.
This study describes an efficient adsorbent consisting of magnetic Fe(3)O(4) 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 Pb(2+)>Cr(3+)>Mn(2+). 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 Pb(2+), Mn(2+) and Cr(3+). Furthermore, a high desorption efficiency was obtained by sodium citrate.
本研究描述了一种由磁性Fe(3)O(4)和结冷胶组成的高效吸附剂，该吸附剂将磁分离与离子交换相结合用于去除重金属。吸附动力学分析表明，吸附容量顺序为Pb(2+)>Cr(3+)>Mn(2+)。不同实验参数研究表明，吸附剂用量、初始金属浓度、温度和初始pH值在吸附过程中起重要作用。此外，Freundlich模型比Langmuir模型更能拟合实验数据。对释放到本体溶液中的钙离子进行化学分析表明，羧基对于结合Pb(2+)、Mn(2+)和Cr(3+)至关重要。此外，柠檬酸钠具有较高的解吸效率。
