Adsorption of Acid Red on Na-bentonite and Activated Carbon
Studies on the removal Acid Red from aqueous solutions by adsorption on Na-bentonite and commercial activated carbon (CAC) have been carried out with an aim to obtain information on treating effluents containing Acid Red. The adsorption equilibrium and kinetics of Acid Red on the two used sorbents have been investigated by a batch adsorption technique at pH 6 and different temperatures (303 K, 313 K and 323 K, Error=±0.1 K). The equilibrium data for Acid Red adsorption on Na-bentonite and CAC well fitted to the Langmuir equation, with maximum monolayer adsorption capacity of 256.41 mg·g-1, 263.17 mg·g-1, 294.12 mg·g-1 and 62.14 mg·g-1, 60.92 mg·g-1, 60.66 mg·g-1 at 303 K, 313 K and 323 K, respectively. By calculating thermodynamic parameters G0, H0 and S0 in the different temperatures, the first was spontaneous, endothermic, while the later was spontaneous, exothermic. Two kinetic models including pseudo-first-order and pseudo-second-order equation were selected to follow the adsorption processes. The adsorption of Acid Red onto Na-bentonite and CAC could be best described by the pseudo-second-order equation. Results showed that Na-bentonite can be more efficient for the treatment of wastewaters containing dyes.
Na-bentonite activated carbon Acid Red kinetic thermodynamics adsorption isotherm
YU Chunli REN Jianmin WU Siwei ZHANG Yongming
Environment and Biological School,Chongqing Technology and Business University,Chongqing 400067,China
国际会议
2009 International Symposium on Environmental Science and Technology(2009环境科学与技术国际会议)
上海
英文
1248-1252
2009-06-02（万方平台首次上网日期，不代表论文的发表时间）