Removal of fluorine from drinking water with Na-P1 zeolite synthesized from coal fly ash
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摘要: 采用水热法合成了Na-P1型粉煤灰沸石，改性后用于去除饮用水中的氟离子。研究了吸附时间、沸石用量、氟离子浓度对除氟率的影响，探讨了沸石除氟的吸附机理。研究表明，将粉煤灰沸石用1.0％的NaOH溶液浸泡12h,然后用2.0％的硫酸铝钾溶液浸泡36h活化，能够明显提高其吸附除氟能力。在考察的范围内，除氟率随吸附时间的延长和沸石用量增多而增加。吸附等温线拟合结果表明,吸附除氟过程符合Langmuir吸附等温式。Abstract: Na-P1 zeolite was synthesized by hydrothermal method from coal fly ash and used to remove fluorine from drinking water. The effects of adsorption time, zeolite usage and fluorinion concentration in water on the removal efficiency were investigated. The results suggested that the fluorine adsorption capacity of Na-P1 zeolite can be enhanced significantly through the modification with 1.0% NaOH solution for 12h and 2.0% KAl(SO4)2 solution for 36h in turn. The fluorine removal ability increases with the adsorption time and the amount of zeolites used. The mechanism of the adsorption was also discussed. The adsorption isotherm could be descried by the Langmuir isotherm equation.
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Key words:
- coal fly ash zeolite /
- drinking water /
- fluorine /
- adsorption isotherm
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