Removal of heavy metals through adsorption using sand
The removal of four heavy metals i.e. Pb, Cr, Cu, and Zn from their aqueous solutions, using ordinary sand as an adsorbent, was studied at 20oC. The amount of metal adsorbed to form monolayer on sand(am), obtained from Langmuir isotherm, exhibited the preference of metals for sand in the order Pb>Cr>Cu>Zn. The heavy metal-sand adsorption phenomena can be illustrated on the basis of the interaction between surface functional group of silicates (sand) and the metal ions. It is deduced that sand can be used as a low cost adsorbent for the removal of heavy metal from wastewater (containing low conc. of metals), especially in the developing countries.
作 者： M.Ali Awan Ishtiaq A.Qazi Imran Khalid 作者单位： M.Ali Awan,Imran Khalid(Institute of Environmental Science and Engineering (IESE), National University of Sciences & Technology (NUST), Rawalpindi, Pakistan)Ishtiaq A.Qazi(Pakistan Council of Renewable Energy Technologies, Islamabad, Pakistan)
刊 名： 环境科学学报(英文版) ISTIC SCI 英文刊名： JOURNAL OF ENVIRONMENTAL SCIENCES 年，卷(期)： 2003 15(3) 分类号： X131 X506 关键词： sand heavy metals adsorption