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Abstract
The sorption of Zn2+, Ni2+ and Cd2+ ions by silica gel was studied as a function of ion concentration, pH and temperature. An increase in all three parameters led to an increase in the extent of sorption for all the metal cations studied. The selectivity of the solid was observed to be in the order Zn2+ > Ni2+ > Cd2+. Sorption of the metal cations was accompanied by the release of H+ ions into the bulk phase. On average two moles of H+ ions were released per mole of metal cation sorbed. The sorption data fitted the linear forms of both the Kurbatov and Langmuir adsorption equations. The values of the binding constants were used to estimate the apparent thermodynamic parameters, ΔH and ΔS, for the adsorption process. FT-IR spectroscopic studies also showed that the uptake of metal cations by the silica gel occurred via a cation-exchange process.
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Affiliation(s)
- S. Mustafa
- National Centre of Excellence in Physical Chemistry, University of Peshawar, Pakistan
| | - B. Dilara
- National Centre of Excellence in Physical Chemistry, University of Peshawar, Pakistan
| | - A. Naeem
- National Centre of Excellence in Physical Chemistry, University of Peshawar, Pakistan
| | - N. Rehana
- National Centre of Excellence in Physical Chemistry, University of Peshawar, Pakistan
| | - K. Nargis
- National Centre of Excellence in Physical Chemistry, University of Peshawar, Pakistan
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Waseem M, Mustafa S, Shah K, Naeem A, Shah S, Mehmood K, Din S. Formation of complexes on the surface of mixed oxides. A comparative sorption study. Sep Purif Technol 2013; 107:238-44. [DOI: 10.1016/j.seppur.2013.01.040] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Affiliation(s)
- Xiaofu Wu
- Institute of Environmental Science and Engineering, Central South University of Forestry and Technology, Shaoshan South Road, 410004, Changsha, Hunan Province, P. R. China
| | - Hailan Zhou
- Hunan Academy of Environmental Protection, Changsha, Hunan Province, P. R. China
| | - Fang Zhao
- Institute of Environmental Science and Engineering, Central South University of Forestry and Technology, Shaoshan South Road, 410004, Changsha, Hunan Province, P. R. China
| | - Chong Zhao
- Shandong Water Polytechnic, Rizhao, Shandong Province, P. R. China
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Xiaofu W, Fang Z, Mingli C, Zhihui J, Qun M. A Simple Way of Calculating the Change in the Gibbs' Free Energy of Ion Adsorption Reactions. ADSORPT SCI TECHNOL 2009. [DOI: 10.1260/026361709788921605] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Affiliation(s)
- Wu Xiaofu
- Institute of Environmental Science and Engineering, Central South University of Forestry and Technology, Shaoshan South Road, 410004 Changsha, Hunan Province, P. R. China
| | - Zhao Fang
- Institute of Environmental Science and Engineering, Central South University of Forestry and Technology, Shaoshan South Road, 410004 Changsha, Hunan Province, P. R. China
| | - Chen Mingli
- Institute of Environmental Science and Engineering, Central South University of Forestry and Technology, Shaoshan South Road, 410004 Changsha, Hunan Province, P. R. China
| | - Ji Zhihui
- Institute of Environmental Science and Engineering, Central South University of Forestry and Technology, Shaoshan South Road, 410004 Changsha, Hunan Province, P. R. China
| | - Ma Qun
- Institute of Environmental Science and Engineering, Central South University of Forestry and Technology, Shaoshan South Road, 410004 Changsha, Hunan Province, P. R. China
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