Synthesis of zeolite Na-P1 from coal fly ash produced by gasification and its application as adsorbent for removal of Cr(VI) from water |
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| Authors: | Yixin Zhang Lu Zhou Liqing Chen Yang Guo Fanhui Guo Jianjun Wu Baiqian Dai |
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| Affiliation: | 1. National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, China2. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China3. School of Chemistry, Monash University, Victoria 3800, Australia4. Department of Chemical Engineering, Monash University, Victoria 3800, Australia |
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| Abstract: | The coal fly ash produced by gasification is estimated to be over 80 million ton per year in China by 2021. It has mainly been disposed as solid waste by landfill. There is lack of study focused on its utilization. In this paper, the coal fly ash produced by gasification was at first analyzed and then applied to synthesize zeolite as an adsorbent. The effects of synthesis conditions on the cation exchange capacity (CEC) of zeolite were investigated. The results from X-ray diffraction and scanning electron microscope indicated that the crystallinity of the synthesized zeolite is the most important factor to affect the CEC. When the synthesized zeolite with the highest CEC (275.5 meq/100 g) was used for the adsorption of Cr(VI) from aqueous solution, the maximum adsorption capacity for Cr(VI) was found to be 17.924 mg/g. The effects of pH, contact time and initial concentration on the adsorption of Cr(VI) were also investigated. The adsorption kinetics and isotherms can be well described by the pseudo-second-order model and Langmuir isotherm model, respectively. |
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| Keywords: | coal fly ash gasification zeolite Na-P1 chromium(VI) |
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