Awan M Ali, Qazi Ishtiaq A, Khalid Imran
Institute of Environmental Science and Engineering (IESE), National University of Sciences & Technology (NUST), Rawalpindi, Pakistan.
J Environ Sci (China). 2003 May;15(3):413-6.
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 20 degrees C. The amount of metal adsorbed to form monolayer on sand (a(m)), 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.
在20摄氏度下，研究了以普通沙子作为吸附剂，从水溶液中去除四种重金属（即铅、铬、铜和锌）的情况。通过朗缪尔等温线得到的在沙子上形成单层吸附的金属量（a(m)）表明，金属对沙子的偏好顺序为铅>铬>铜>锌。重金属-沙子的吸附现象可以基于硅酸盐（沙子）表面官能团与金属离子之间的相互作用来解释。据推断，沙子可作为一种低成本吸附剂，用于去除废水中（金属浓度低）的重金属，特别是在发展中国家。
