Al Rmalli Shaban W, Dahmani Abdella A, Abuein Mohamed M, Gleza Amar A
Department of Chemistry, Faculty of Sciences, Alfateh University, Tripoli, Libya.
J Hazard Mater. 2008 Apr 15;152(3):955-9. doi: 10.1016/j.jhazmat.2007.07.111. Epub 2007 Aug 6.
A new biosorbent produced from castor leaves powder [Ricinus communis L.] was used to remove mercury(II) from aqueous solutions. The initial mercury concentrations, contact time and initial pH were evaluated. The ability of castor leaves to remove mercury at various pH (2-8) was studied. The maximum capacity (Qmax) of biomass was found to be 37.2mg Hg(II)/g at pH 5.5. Biosorption equilibrium was established in approximately 1h. The equilibrium data were described well by Langmuir and Freundlich models. The adsorbed mercury on biomass was desorbed using 10 ml of 4M HCl solution. The biomass could be reused for other biosorption assays. The ability of biomass to adsorb mercury(II) in a column was investigated. These studies consider the possibility of using leaves of castor tree as an inexpensive adsorbent for the removal of Hg(II) from contaminated chemical and mining industry wastewaters. It is also suggested that the dried biomass might be simply kept and used in a very low cost metal ion removal system.
一种由蓖麻叶粉末[蓖麻属植物]制备的新型生物吸附剂被用于从水溶液中去除汞(II)。评估了初始汞浓度、接触时间和初始pH值。研究了蓖麻叶在不同pH值（2 - 8）下去除汞的能力。发现在pH 5.5时生物质的最大吸附量（Qmax）为37.2mg汞(II)/克。生物吸附平衡在大约1小时内建立。Langmuir和Freundlich模型能很好地描述平衡数据。用10毫升4M盐酸溶液解吸吸附在生物质上的汞。该生物质可重复用于其他生物吸附试验。研究了生物质在柱中吸附汞(II)的能力。这些研究考虑了使用蓖麻叶作为廉价吸附剂从受污染的化工和采矿业废水中去除汞(II)的可能性。还表明，干燥的生物质可以简单保存并用于成本极低的金属离子去除系统。
