期刊
CHEMICAL ENGINEERING JOURNAL
卷 158, 期 3, 页码 489-497出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2010.01.033
关键词
Acid dye; Cationic polymer/bentonite; Adsorption equilibrium; Thermodynamics; Process design
资金
- Postdoctoral Innovation Fund of Shandong Province [200802020]
- Foundation for Young Excellent Scientists in Shandong Province [BS2009NY005]
- Young scientific and technical star plan in Jinan City [20090215]
- National Science and Technology [2006BAJ08B05-2]
- Chinese National Foundation of Natural Sciences [50878121]
- Hi-Tech Research and Development Program of China [2006AA06Z326]
The adsorption equilibrium, thermodynamics and process design of the polyepicholorohydrin-dimethylamine (EPI-DMA) cationic polymer-loaded bentonite (EPI-DMA/bentonite) for the removal of two acid dyes (Acid Scarlet GR and Acid Dark Blue 2G) were studied to assess the adsorption capacities, mechanisms and the minimum adsorbent amount. The effects of solution pH and salt concentration on the removal of acid dye were also investigated. The equilibrium data were analyzed by the Langmuir and Freundlich model, which revealed that Freundlich model was more suitable to describe the acid dyes adsorption than Langmuir model. According to the dependence of thermodynamic equilibrium constant (K-s) on temperatures, the thermodynamic parameters associated with the adsorption process were calculated. The negative values of Delta G(0) indicate that the overall adsorption processes are spontaneous. And the positive values of Delta H-0 show that the adsorption processes are endothermic in nature and the adsorption mechanisms are between physical adsorption and chemisorption. Based on the well correlated adsorption isotherm, an adsorption process design model has been developed for the design of a two-stage batch adsorber to predict the minimum amount of adsorbent to achieve a specified percentage of dye removal. Results show that compared with the single-stage batch adsorption, the two-stage process can significantly save adsorbent to meet the needs for higher dye removal efficiency (>99%) and therefore minimize capital investment costs. (C) 2010 Elsevier B.V. All rights reserved.
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