Removal of methylene blue from aqueous solutions by adsorption onto chemically activated halloysite nanotubes |
| |
Authors: | Peng Luo Bing Zhang Yafei Zhao Jinhua Wang Haoqin Zhang Jindun Liu |
| |
Affiliation: | (1) Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, People’s Republic of China;(2) Graduate University of the Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China; |
| |
Abstract: | This study examines the adsorption behavior of methylene blue (MB) from aqueous solutions onto chemically activated halloysite
nanotubes. Adsorption of MB depends greatly on the adsorbent dose, pH, initial concentration, temperature and contact time.
The Langmuir and Freundlich models were applied to describe the equilibrium isotherms and the Langmuir model agrees very well
with experimental data. The maximum adsorption capacities for MB ranged from 91.32 to 103.63 mg·g−1 between 298 and 318 K. A comparison of kinetic models applied to the adsorption data was evaluated for pseudo-first-order,
pseudo-second-order, Elovich and intra-particle diffusion equation. The results showed the adsorption process was well described
by the pseudo-second-order and intra-particle diffusion mode. Thermodynamic parameters suggest that the adsorption is spontaneous
and endothermic. The obtained results indicated that the product had the potential to be utilized as low-cost and effective
alternative for dye removal in wastewater. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|