Ammonia Removal from Aqueous Solution by Zeolites Synthesized from Coal Fly Ash

X. Cui, Shuwei Chen, Xuning Zhang, Jinghong Ma, Ruifeng Li
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引用次数: 2

Abstract

The removal of ammonia from aqueous solutions using zeolites (ZFAs) synthesized from coal fly ash (CFA) as low-cost absorbent was investigated in a batch mode. When raw CFA was subjected to alkaline hydrothermal zeolite synthesis, the Zeolite X (ZFA-X) and zeolite A (ZFA-A) were formed. ZFAs had a much greater ability than CFA to remove ammonia. The pH strongly influenced ammonia removal by ZFAs. The higher removal efficiency was achieved when operating at pH between 6.5 and 8.5 for the ZFAs. From ammonia solution of initial concentration equal to 100 mg/L, the removal percentage reached values of 18.4, 76.8, and 82.1%, respectively, for CFA, ZFA-A and ZFA-X at room temperature, pH = 7.5, sorbent dose of 15 g/L, and contact time of 0.5 h. The experimental results indicated that ZFAs may be promising materials for the purification of ammonia from water/wastewater.
粉煤灰合成沸石去除水溶液中氨
以粉煤灰(CFA)为原料合成沸石(ZFAs)作为低成本吸附剂,研究了其对水溶液中氨的去除效果。原料CFA经碱性水热合成沸石后,形成沸石X (ZFA-X)和沸石A (ZFA-A)。ZFAs对氨的去除率明显高于CFA。pH值对ZFAs的脱氨效果影响较大。在pH为6.5 ~ 8.5的条件下,ZFAs的去除率较高。在初始浓度为100 mg/L的氨溶液中,在室温、pH = 7.5、吸附剂剂量为15 g/L、接触时间为0.5 h的条件下,CFA、ZFA-A和ZFA-X的去除率分别为18.4%、76.8和82.1%。实验结果表明,zfa可能是纯化水/废水中氨的理想材料。
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