Sekhar M Chandra
Department of Civil Engineering, National Institute of Technology, Warangal-506 004, India.
J Environ Sci Eng. 2008 Apr;50(2):137-40.
The application of adsorption for removal of heavy metals is quite popular and activated carbon is universally used as an adsorbent. However, high cost of its preparation and regeneration has led to a search for alternative sorbents, especially in the developing countries. A number of sorbents are used to remove metals by adsorption from industrial effluents, which include insoluble starch, xanthates, modified cotton and wool, tree barks, activated carbon, plant leaves and agricultural products. Therefore, as an alternative, coconut shell carbon (CSC), a low cost sorbent derived from organic waste material, was used in the present work, for removal of lead from aqueous effluents. The results of the batch sorption studies indicated that the efficiency of lead removal by coconut shell carbon is comparable to that of commercially available activated carbon. From the kinetic and equilibrium studies, the sorptive capacity of coconut shell carbon for lead was found to be 30 mg/g. Desorption and subsequent recovery of the metal from the surface of the sorbent was successfully demonstrated. Parameters affecting the sorption were evaluated.
吸附法在去除重金属方面应用广泛,活性炭是普遍使用的吸附剂。然而,其制备和再生成本高昂,促使人们寻找替代吸附剂,尤其是在发展中国家。许多吸附剂用于从工业废水中吸附去除金属,包括不溶性淀粉、黄原酸盐、改性棉和羊毛、树皮、活性炭、植物叶子及农产品。因此,作为一种替代方案,本研究使用了由有机废料衍生而来的低成本吸附剂——椰壳炭(CSC),用于去除废水中的铅。批量吸附研究结果表明,椰壳炭去除铅的效率与市售活性炭相当。通过动力学和平衡研究发现,椰壳炭对铅的吸附容量为30 mg/g。成功证明了从吸附剂表面解吸并随后回收金属的过程。评估了影响吸附的参数。