本文基于超临界水的独特性质,以煤矸石为原料,采用超临界水热法合成沸石.考察了碱的类型、碱溶液浓度、超临界反应时间和温度对沸石结构的影响.并通过脱除废水中汞离子来考察合成的类沸石材料的吸附性能.采用X射线衍射(XRD)、扫描电子显微镜(SEM)与热重分析(TG-DTG)等分析手段,对产品进行表征.结果表明:煤矸石与1 mol/L碳酸钠溶液、1 mol/L氢氧化钠溶液与2 mol/L氢氧化钾溶液在超临界水热条件下,反应温度为400℃,反应时间为5 min,分别成功合成了方钠石、钙霞石与钾霞石.钾霞石具有良好的热稳定性和优良的液相脱汞能力,其脱汞率可达到95.71%.
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