Benhima H, Chiban M, Sinan F, Seta P, Persin M
Laboratoire de Chimie-Physique, Université Ibn Zohr, BP 8106 Cité Dakhla Agadir, Morocco.
Colloids Surf B Biointerfaces. 2008 Jan 15;61(1):10-6. doi: 10.1016/j.colsurfb.2007.06.024. Epub 2007 Jun 30.
In the present work, Pb(II) and Cd(II) ion adsorption onto inert organic matter (IOM) obtained from ground dried plants: Euphorbia echinus, Launea arborescens, Senecio anthophorbium growing in semi-arid zones of Morocco and Carpobrotus edulis as the Mediterranean plant has been studied. A suspension of plant deroed micro-particles adsorbs lead and cadmium present as ionic species, with a higher affinity for Pb(II). The kinetics and the maximum capacity adsorption depend on the type of plant as well as on the metal ions (atomic weight, ionic radius and electronegativity). The adsorption process is affected by various parameters such as contact time, solution volume to mass of plant particles ratio (m/V), particle size, solution pH and metal concentration. A dose of 25 g/l of adsorbent was optimal to obtain maximum adsorption of both metal ions. The maximum metal uptake was obtained with particles of organic matter of <50 microm. As to classical ionic adsorption phenomena, the adsorption of both metal ions increases with the increase of the initial concentration in the solution. For the two metal cations, the uptake efficiency of the studied plants ranged from: C. edulis>E. echinus>S. anthophorbium>L. arborescens, however, the differences are rather small. Two different waste water types (domestic and industrial) were tested and good results were obtained for removal of Pb(II) and Cd(II) at more than 90%. The removal of the metal and mineral ions waste water was observed for PO(4)(3-) at 88%, for NO(3)(-) at 96.5% and for metal ions (Pb(II), Cd(II), Cu(II) and Zn(II)) at about 100%, using IOM as absorbent.
在本研究中，对从摩洛哥半干旱地区生长的干燥植物（大戟、乔木状栓果菊、黄花千里光）以及地中海植物食用日中花中获得的惰性有机物（IOM）对铅（II）和镉（II）离子的吸附进行了研究。植物衍生的微粒悬浮液吸附以离子形式存在的铅和镉，对Pb（II）具有更高的亲和力。动力学和最大吸附容量取决于植物类型以及金属离子（原子量、离子半径和电负性）。吸附过程受多种参数影响，如接触时间、溶液体积与植物颗粒质量比（m/V）、粒径、溶液pH值和金属浓度。25 g/l的吸附剂剂量是获得两种金属离子最大吸附量的最佳剂量。最大金属吸附量是使用<50微米的有机物颗粒获得的。至于经典的离子吸附现象，两种金属离子的吸附量都随溶液中初始浓度的增加而增加。对于这两种金属阳离子，所研究植物的吸收效率范围为：食用日中花>大戟>黄花千里光>乔木状栓果菊，然而，差异相当小。测试了两种不同类型的废水（生活废水和工业废水），对于去除Pb（II）和Cd（II），获得了超过90%的良好效果。以IOM作为吸附剂时，观察到PO(4)(3-)的去除率为88%，NO(3)(-)的去除率为96.5%，金属离子（Pb（II）、Cd（II）、Cu（II）和Zn（II））的去除率约为100%。
