Department of Chemistry, Faculty of Science, BP. 8106, Hay Dakhla, Agadir 80000, Morocco.
J Environ Manage. 2012 Mar;95 Suppl:S61-5. doi: 10.1016/j.jenvman.2011.06.044. Epub 2011 Jul 30.
A new adsorbent for removing metallic elements, nitrate and phosphate ions from municipal and industrial wastewaters has been investigated. This new adsorbent consists of micro-particles of dried Withania frutescens plant (<500 μm). Batch experiments were conducted to evaluate the removal of metallic elements and anions from raw wastewaters by W. frutescens particles. The results show that the micro-particles of W. frutescens plant presented a good adsorption of metallic elements, nitrate and phosphate ions from both real wastewaters. This adsorption increased with increasing of contact time. The percentage of metallic elements removal from industrial wastewater by W. frutescens plant was 98 ≈ 99% for Pb(II), 92 ≈ 93% for Cd(II), 91 ≈ 92% for Cu(II) and 92 ≈ 93% for Zn(II). The maximum adsorption capacity was dependent on the type of ions. The results also indicate that the values of chemical oxygen demand (COD) decrease after the contact with W. frutescens particles. Based on the results it can be concluded that the dried W. frutescens plant appears to be an economical and environmentally friendly material for wastewater treatment.
一种用于去除城市和工业废水中金属元素、硝酸盐和磷酸盐离子的新型吸附剂已经过研究。这种新型吸附剂由干燥的印度人参（<500μm）微颗粒组成。进行了批量实验，以评估 W. frutescens 颗粒对原废水的金属元素和阴离子的去除效果。结果表明，W. frutescens 植物的微颗粒对来自真实废水的金属元素、硝酸盐和磷酸盐离子具有良好的吸附作用。这种吸附作用随接触时间的增加而增加。W. frutescens 植物对工业废水中 Pb(II)的去除率为 98%≈99%，Cd(II)为 92%≈93%，Cu(II)为 91%≈92%，Zn(II)为 92%≈93%。最大吸附容量取决于离子的类型。结果还表明，与 W. frutescens 颗粒接触后，化学需氧量（COD）值下降。根据结果可以得出结论，干燥的印度人参植物似乎是一种经济且环保的废水处理材料。
