Analytical Chemistry Centre, National Metallurgical Laboratory, Jamshedpur 831007, Jharkhand, India.
J Hazard Mater. 2010 Jan 15;173(1-3):502-9. doi: 10.1016/j.jhazmat.2009.08.113. Epub 2009 Aug 31.
Biosorption of Pb(II) on bael leaves (Aegle marmelos) was investigated for the removal of Pb(II) from aqueous solution using different doses of adsorbent, initial pH, and contact time. The maximum Pb loading capacity of the bael leaves was 104 mg g(-1) at 50 mg L(-1) initial Pb(II) concentration at pH 5.1. SEM and FT-IR studies indicated that the adsorption of Pb(II) occurs inside the wall of the hollow tubes present in the bael leaves and carboxylic acid, thioester and sulphonamide groups are involved in the process. The sorption process was best described by pseudo second order kinetics. Among Freundlich and Langmuir isotherms, the latter had a better fit with the experimental data. The activation energy E(a) confirmed that the nature of adsorption was physisorption. Bael leaves can selectively remove Pb(II) in the presence of other metal ions. This was demonstrated by removing Pb from the effluent of exhausted batteries.
采用不同剂量的吸附剂、初始 pH 值和接触时间，研究了菩提树叶（Aegle marmelos）对 Pb(II) 的生物吸附，以从水溶液中去除 Pb(II)。在初始 Pb(II)浓度为 50 mg L(-1)、pH 值为 5.1 时，菩提树叶的最大 Pb 负载量为 104 mg g(-1)。SEM 和 FT-IR 研究表明，Pb(II)的吸附发生在菩提树叶中空管的管壁内，参与该过程的基团有羧酸、硫酯和磺酰胺。吸附过程最符合伪二级动力学模型。在 Freundlich 和 Langmuir 等温线中，后者与实验数据拟合更好。活化能 E(a)证实了吸附的性质为物理吸附。菩提树叶可以在存在其他金属离子的情况下选择性地去除 Pb(II)。这通过从废弃电池的流出物中去除 Pb 得到了证明。
