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Removal of Ni~(2+) from waste water by Na-X zeolite synthesized from coal fly ash

Ruifeng Li

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Abstract

Na-X zeolite(ZFA)was successfully synthesized from coal fly ash(CFA)through NaOH fusion and hydrothermal treatments and used to remove Ni2+ in waster water.To obtain the optimum conditions of Ni2+ sorption on the ZFA,the influence of operation conditions like solution pH value,adsorbent dose,contact time,Ni2+ ion concentration and adsorption temperature was investigated.The results showed that the ZFA obtained in this work is comparable with the 13X zeolites synthesized from chemicals in the efficiency of Ni2+ removal from wastewater.More than 90% of Ni2+ could be removed by ZFA from the waste water with initial Ni2+ concentration of 20mg/L~150mg/L at 20℃,solution pH value of 6,sorbent dose of 10g/L,and contact time of 15min.The adsorption of Ni2+ on the ZFA fits the Langmuir isotherm well;its monolayer adsorption capacity reaches 11.2×10-3 at 20℃.ZFA exhibits good regenerability and its removal efficiency for Ni2+does not decrease within five recycles.

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What this paper is about

Na-X zeolite(ZFA)was successfully synthesized from coal fly ash(CFA)through NaOH fusion and hydrothermal treatments and used to remove Ni2+ in waster water.To obtain the optimum conditions of Ni2+ sorption on the ZFA,the influence of operation conditions like solution pH value,adsorbent dose,contact time,Ni2+ ion concentration and adsorption temperature was investigated.The results showed that the ZFA obtained in this work is comparable with the 13X zeolites synthesized from chemicals in the efficiency of Ni2+ removal from wastewater.More than 90% of Ni2+ could be removed by ZFA from the waste water with initial Ni2+ concentration of 20mg/L~150mg/L at 20℃,solution pH value of 6,sorbent dose of 10g/L,and contact time of 15min.The adsorption of Ni2+ on the ZFA fits the Langmuir isotherm well;its monolayer adsorption capacity reaches 11.2×10-3 at 20℃.ZFA exhibits good regenerability and its removal efficiency for Ni2+does not decrease within five recycles.

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Available abstract

Na-X zeolite(ZFA)was successfully synthesized from coal fly ash(CFA)through NaOH fusion and hydrothermal treatments and used to remove Ni2+ in waster water.To obtain the optimum conditions of Ni2+ sorption on the ZFA,the influence of operation conditions like solution pH value,adsorbent dose,contact time,Ni2+ ion concentration and adsorption temperature was investigated.The results showed that the ZFA obtained in this work is comparable with the 13X zeolites synthesized from chemicals in the efficiency of Ni2+ removal from wastewater.More than 90% of Ni2+ could be removed by ZFA from the waste water with initial Ni2+ concentration of 20mg/L~150mg/L at 20℃,solution pH value of 6,sorbent dose of 10g/L,and contact time of 15min.The adsorption of Ni2+ on the ZFA fits the Langmuir isotherm well;its monolayer adsorption capacity reaches 11.2×10-3 at 20℃.ZFA exhibits good regenerability and its removal efficiency for Ni2+does not decrease within five recycles.

Key concepts: Chemistry, Zeolite, Adsorption, Sorption, Fly ash, Sorbent, Wastewater, Nuclear chemistry

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