Comparison for adsorption modeling of heavy metals (Cd, Pb, Cu, Zn) from aqueous solution by bio-formulation
The demand for effective and inexpensive sorbents is increasing in response to the widespread recognition of the deleterious health effects of heavy metals exposure through aqueous solutions. An adsorbent, bio-formulation (BF), was prepared by agricultural waste. The maximal biosorption removal of cadmium(Ⅱ), lead(Ⅱ), copper(Ⅱ), zinc(Ⅱ) on BF are 99.4, 99.8, 97.6, 98.3％ at pH 8, 5, 5, 7, respectively. Freundlich adsorption isotherm is well fitted to the experimental data. The adsorption kinetics of heavy metals reveal that adsorption of heavy metals is very rapid within the first 30 min and equilibrium time is independent of initial concentration. The adsorption process follows second-order sorption kinetics. The biosorption mechanism may be cation exchange effect.
Bio-Formulation (BF) Heavy metals Adsorption modeling
CHEN Yun-nen CHAI Li-yuan
School of Resource and Environmental Engineering Jiangxi University of Science and Technology Ganzho School of Metallurgical Science & Engineering Central South University Changsha, China
国际会议
上海
英文
2894-2897
2008-05-16（万方平台首次上网日期，不代表论文的发表时间）