期刊名称：Pakistan Journal of Analytical & Environmental Chemistry
印刷版ISSN：1996-918X
电子版ISSN：2221-5255
出版年度：2012
卷号：13
期号：2
页码：137-147
语种：English
出版社：National Centre of Excellence in Analytical Chemsitry
摘要：The ability of Betel-nut Peel BP,an agricultural waste material,for the removal of chromium (Cr3+),cadmium (Cd2+) and lead (Pb2+) from aqueous solution has been investigated. In the batch tests experimental parameters were studied,including solution pH,contact time,adsorbent dose,initial solution volume of metal ions and initial metal ions concentration. The adsorbent exhibited good sorption potential at pH 4.0. Maximum removal of Cr,Cd and Pb (96-98.0) % with (60 mg/ mL) of sorbent was observed at 10 mg/L sorbate concentration. Removal of about 50-60% occurred in 50 min,and equilibrium was attained at around 90 min for all the three metal ions. The functional groups (C=O,S=O,−OH) present on the carbon surface of BP were responsible for the adsorption of metal ions. The adsorption parameters were analyzed using both the Freundlich and Langmuir models. The value of KF is large and 1/n is 0.1-0.69,indicating that BP has high adsorption capacities for Cr3+,Cd2+ and Pb2+. The desorption studies were carried out using HCl. Maximum desorptions of 72% for Cd and Pb and 67% for Cr were attained with 6M HCl..
