期刊名称：Journal of Sustainable Development of Energy, Water and Environment Systems
电子版ISSN：1848-9257
出版年度：2015
卷号：3
期号：4
页码：405-415
DOI：10.13044/j.sdewes.2015.03.0030
语种：English
出版社：International Centre for Sustainable Developmen of Energy, Water and Environment Systems
摘要：In this work, waste marigold flowers from Temple were used as adsorbent to remove cadmium (II) and chromium (VI) ions from aqueous solutions. Influences of initial heavy metal concentrations, contact time, adsorbent dose, temperature and initial pH on removal of cadmium (II) and chromium (VI) ions were studied under batch mode of operation. Both the adsorption process of cadmium (II) and chromium (VI) followed pseudo-second order kinetics. Adsorption isotherm parameters of cadmium (II) and chromium (VI) on dried marigold flower were determined using Langmuir and Freundlich models. Thermodynamic parameters depicted that the process was spontaneous and exothermic under experimental conditions. The maximum removal efficiency of cadmium (II) was obtained as 83% at contact time 75 min and pH 5. The maximum removal efficiency of chromium (VI) was found as 96% at contact time 105 min and pH 3. Dried marigold flower showed active reusability characteristics upto three consecutive adsorption-desorption cycles.
关键词：Adsorption;Cd(II) and Cr(VI);Kinetics;Isotherms;Marigold flower.
