【摘要】 本文研究了温度、碱度、液固比(L/S)及反应时间对粉煤灰水热法合成沸石过程中其溶解性的影响,结果表明在溶解阶段,反应时间、温度、碱度及液固比与粉煤灰的溶解性成正相关,而随着反应进入到结晶阶段,溶解的Si和Al逐渐组合成沸石。在温度为95℃、L/S为6 mL/g、碱浓度(NaOH)为2 mol/L的条件下,Na-P1沸石的合成在96h时产量最高,同时其阳离子交换容量(CEC)为206.7 cmol/kg,比表面积(SSA)为37.7 m2/g,分别是原样粉煤灰的125倍和34倍,在水环境污染物吸附方面具有较大的应用潜能。更多还原

【Abstract】 The effects of reaction temperature,alkalinity level,liquid-solid ratio(L/S) and reaction time on hydrothermal synthesis zeolite from coal fly ash were studied.The results showed that the reaction time,temperature,alkalinity and L/S ratio were positively related to the solubility of coal fly ash during its dissolution stage.In the following crystalline phase,the dissolved Si and Al gradually formed into zeolite.At the temperature of 95 ℃,L/S =6 mL/g,C(NaOH)=2 mol/L,the yield of synthesized zeolite Na-P1 reached the highest level at 96 h.The synthesized product had the cation exchange capacity(CEC) of 206.7 cmol/kg and specific surface area(SSA) of 37.7 m2/g,being 125 times and 34 times of the raw coal fly ash,respectively.The combined zeolite obtained from coal fly ash showed a large adsorption potential in environmental contaminants treatments.更多还原