铁活化天然斜发沸石吸附水中氟的研究

Adsorption of Fluoride from Drinking Water by Iron-activated Clinoptilolites

用2%N aOH预处理,再经5%F eC l3静态热浸渍和动态热浸渍的铁活化斜发沸石矿样(3#和4#),对水中氟离子的吸附能力有了明显提高,饱和吸附量分别达到664、788 m g/kg,其吸附行为分别属指数型和S型等温线.用D-R方程线性拟合发现3#矿样化学吸附为主,4#矿样化学吸附和物理吸附兼有.吸附机理的差异主要来自铁活化引起的矿样比表面积、孔分布以及表面极性的不同.

Two iron activated clinoptilolites （3^# and 4^#） were studied to determine their adsorption capacities of fluoride from drinking water. The clinoptilolites were prepared by the static and dynamic thermal impregnation method with 2% NaOH and 5% FeCl3 solutions, respectively. The results showed that their adsorption capacities were enhanced obviously, their saturated adsorption capacities were 664 and 788 mg/kg, respectively and their adsorption isotherms belonged to the exponential type and S-type respectively. The linear fitting of D-R isotherm equation showed that the adsorption behavior was the chemical adsorption mainly in sample 3^# and both chemical and physical adsorption in samples 4^#. The difference of adsorption behaviour was from the difference of specific area, pore distribution and surface polarization of two samples.