Journal
CHEMICAL ENGINEERING JOURNAL
Volume 250, Issue -, Pages 55-65Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.03.106
Keywords
Functionalized silica gel; Zwitterionic ligand; Schiff base; Adsorption; Copper ion; Sulfate ion
Categories
Funding
- National Natural Science Foundation of China [21277106, 21101122]
- Natural Science Foundation of Hubei Province [2008CDB038]
- Scientific Research Program of the Educational Department of Hubei Province [D20091703]
- Research Foundation of Wuhan Textile University [2008Z06]
- EPSRC [EP/I011870/1, EP/I020942/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I020942/1, EP/I011870/1, EP/C528964/1] Funding Source: researchfish
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A novel silica gel based absorbent SG-H2L1, capable of simultaneous adsorption of cations and anions from aqueous solution, was prepared by immobilization of a ditopic zwitterionic Schiff base ligand H2L1 onto a modified silica gel. The functionalized silica gels were characterized by Fourier transform infrared spectroscopy, elemental analysis, thermogravimetric analysis and porous structure analysis. The results showed a degree of functionalization of 0.32 mmol H2L1 per gram of SG-H2L1. The effect of pH, contact time and initial Cu(II) and SO42- concentration parameters on the simultaneous adsorption of Cu(II) and SO42- were investigated. The adsorption was fast and the effective pH range for simultaneous adsorption of Cu(II) and SO42-, was neutral region. The adsorption study showed that SG-H2L1 had good adsorption efficiency for Cu(II) and SO42-, and the maximum adsorption capacity for Cu(II) and SO42-, respectively, was the same of 0.65 mmol g(-1) at 25 degrees C. Langmuir and Freundlich isotherm models were employed to analyze the experimental data, and the Langmuir model fitted better for both Cu(II) and SO42-. Due to the zwitterionic feature, desorption and regeneration of the absorbent was readily realized by adjusting the pH of the regenerating media with diluted H2SO4 (0.5 mol L-1) and ammonia solution (pH = 10), respectively. The new type absorbent SG-H2L1 exhibited good recyclability and reusability for 5 cycles use without deterioration in its functionality. Therefore, the adsorbent can be used effectively for efficient and simultaneous adsorption of Cu(II) and SO42- from waste water. The mechanism for simultaneous adsorption of cation and anions on SG-H2L1 was also discussed. This study provides a strategy for the development of new absorbents for simultaneous adsorption of hazardous metal ions and anions from waste water effluents. (C) 2014 Elsevier B.V. All rights reserved.
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