The Langmuir two-surface equation as a model for cadmium adsorption on peat |
| |
Authors: | Sukand lis Sukand Renata Mairin Aleksei Tenno Toomas |
| |
Institution: | 1.Tartu Environmental Research Ltd.,Tartu,Estonia;2.Institute of Physical Chemistry, Chair of Colloid and Environmental Chemistry,University of Tartu,Tartu,Estonia |
| |
Abstract: | The Langmuir isotherm equation is often used to describe the adsorption of cadmium on peat. If the total surface onsists of two or more populations of sites with different bonding energies, it is proposed that the Langmuir two-surface equation be used. The effects of the contact time and pH on adsorption were investigated in batch experiments. Adsorption batch isotherm studies were carried out by using 12 solutions with initial concentrations of 5–110 mg/l. The samples were analysed by using axial ICP-AES. Adsorption data were compared using four different linearizations (Lineweaver-Burk, Eadie-Hofstee, Scatchard and Langmuir linearizations). Better results among linearizations were found with the Langmuir linearization, but the results obtained by using the nonlinear regression were still the best. A new, nonlinear regression method for the calculation of the equation constants was created by using the system of equations and these findings were compared to the results found using earlier methods. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|