Journal
CHEMICAL ENGINEERING JOURNAL
Volume 223, Issue -, Pages 183-191Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2013.03.023
Keywords
Column experiments; F-; Modification; Regeneration; Removal
Categories
Funding
- National Basic Research Program of China (the 973 program) [2010CB428804]
- Natural Science Foundation of China [41172224, 41222020]
- Cultivation Fund of the Key Scientific and Technical Innovation Project, Ministry of Education of China [708012]
Ask authors/readers for more resources
Natural siderite modified by aluminum sulfate and aluminum sol was synthesized and characterized for F- removal. Natural siderite powders, Al-2(SO4)(3), and AlOOH were mixed with different ratios, granulated by an extrusion method, and calcined at different temperatures for different time durations. The optimum modified natural siderite (OMNS) was obtained with the mass ratio of 50 g:0.3 g:10 g for natural siderite powders:Al-2(SO4)(3):AlOOH and calcinated at 450 degrees C for 3 h. Solution pH had no significant effect on F- removal between 3.5 and 10.0. Kinetic results showed that adsorption followed the pseudo-second-order kinetic equation. Both the external adsorption and the intra-particle diffusion contributed to adsorption processes, while pore diffusion controlled fluoride adsorption on OMNS according to Bahangam equation. Thermodynamic data showed that fluoride adsorption on OMNS was reasonably spontaneous and endothermic. Moreover, fluoride adsorption was obviously constrained by the coexistence of HCO3- and PO43-. Column studies revealed that breakthrough time and adsorption capacity were lower at higher concentration and/or higher flow rate. The XRD studies indicated the uptake of F- by the OMNS attributed to the coexistence of hematite and gamma-Al2O3 in the material. (C) 2013 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available