Optimization of High Cation Exchange Capacity Modified Coal Fly Ash Using Response Surface Methodology
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Abstract
The optimization of high Cation Exchange Capacity (CEC) of the modified coal fly ash was studied. CEC of the coal fly ash before modification was 61.28 meq/100 g. The experimental condition was designed by Box- Benkhen design. The independent variables are retention time (12-36 hr), NaOH concentration (2-4 M) and temperature (80-100 Cº). The result showed that the independent variables had no significant effect to CEC at 95% confidence level (P>0.05). However, The interaction effect between retention time with temperature and NaOH concentration with temperature have significant effect to CEC at 95% confidence level (P<0.05) Thus, the optimum condition of high CEC (272.12 meq/100 g) was 34 hr of retention time, 4M of NaOH concentration and 80 Cº of temperature. The optimum condition was validated by experimental with 3 times. The results found that CEC of the validated optimum was 269.50±2 meq/100 g which was closely the predicted value.
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[2] Kondru, A.K., Kumar, P., Teng, T.T., Chand, S. and Wasewar, KL. 2011. Synthesis and characterization of Na-Y zeolite from coal fly ash and its effectiveness in removal of dye from aqueous solution by wet peroxide oxidation. Arch Environ Sci. 5: 46-54.
[3] Chen, J.G., Kong, H.N., Wu, D.Y., Hu, Z.B., Wang, Z.S. and Wang, Y.H. 2006. Removal of phosphate from aqueous solution by zeolite synthesized from fly ash, Journal of Colloid and Interface Science. 300: 491-497.
[4] Al-Shawabkeh, A., Matsuda, H., Hasatani, M. 1995. Comparative reactivity of treated FBC- and PCC-fly ash for SO2 removal. Can J. Chem. Eng. 73: 678-85.
[5] Zhang, M., Zhang, H., Xu, D., Han, L., Niu, D., Tian, B., Zhang, J., Zhang, L. and Wu, W. 2011. Removal of ammonium from aqueous solutions using zeolite synthesized from fly ash by a fusion method Desalination. 271: 111-121.
[6] Song, C., Y. Kitamura, and S. Li. 2014. Optimization of a novel cryogenic CO2 capture process by response surface methodology (RSM). J. Taiwan Inst. Chem. Eng. 45: 1666-1676.
[7] Ray, S., Reaume, S.J. and Lalman, J.A. 2010. Developing a statistical model to predict hydrogen production by a mixed anaerobic mesophilic culture. International Journal of Hydrogen Energy 35: 5332-5342.
[8] Tantriratna, P., Wirojanagud, W., Neramittagapong, S., Wantala, K. and Grisdanurak, N. 2011. Optimization for UV-photocatalytic degradation of paraquat over titanium dioxide supported on rice husk silica using Box-Behnken design, Indian J. Chem. Technol. 18: 363-371.
[9] Wantala, K., Khongkasem, E., Khlongkarnpanich, N., Sthiannopkao, S. and Kim, K.-W. 2012. Optimization of As(V) adsorption on Fe-RH-MCM-41-immobilized GAC using Box–Behnken Design: Effects of pH, loadings, and initial concentrations, Appl. Geochem. 27: 1027-1034.
[10] Wang, Y. and Lin, F. 2009. Synthesis of high capacity cation exchangers from a low-grade Chinese natural Zeolite. J. Hazard Mater. 166: 1014-1019.
[11] Breck, D.W. 1974. Zeolite Molecular Sieves, John Wiley and Sons, New York.
[12] Ojha, K., Pradhan, N.C. and Samanta, A.N. 2004. Zeolite from fly ash: synthesis and characterization, Bull. Mater. Sci. 27: 555-564.
[13] Shigemoto, N., Hayashi, H. and Miyaura, K. 1993. Selective formation of Na-X zeolite from coal fly ash by fusion with sodium hydroxide prior to hydrothermal reaction, J. Mater. Sci. 28: 4781-4786.