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[目的]对沸石进行负载氧化镧的改性,用于高氟水除氟,评价其吸附性能。[方法]用碱性氯化镧溶液浸渍—干燥—高温焙烧法对人造沸石进行改性,用模拟高氟水样进行静态吸附实验。[结果]动力学研究结果表明:吸附速度快,40min内接近吸附平衡,吸附速率可用拟二级动力学方程描述。吸附等温线表明:在平衡浓度很低(﹤1.0mg/L)时就接近饱和吸附量,平衡吸附数据符合Langmuir吸附等温线,饱和吸附量为7.49mg/g,吸附平衡常数为7.38L/mg。对浓度为10mg/L的含氟水样投加3g/L吸附剂,除氟率达91.4%。溶液pH值对吸附有影响,最佳吸附在pH4～5。水中共存CaCl2及温度对吸附的影响不大。[结论]氧化镧改性沸石对氟的吸附力强,除氟效率高。
[Objective] The modified zeolite lanthanum oxide was used to remove fluoride in high-fluorine water and its adsorption performance was evaluated. [Method] The artificial zeolite was modified by impregnation - drying - high temperature calcination with alkaline lanthanum chloride solution. The static adsorption experiment was carried out by simulating high fluorine water sample. [Result] The results of kinetic study showed that the adsorption rate was fast and close to the adsorption equilibrium within 40 min. The adsorption rate could be described by the pseudo second-order kinetic equation. The adsorption isotherms showed that the equilibrium adsorption was close to the saturated adsorption at very low equilibrium concentrations (<1.0 mg / L), the equilibrium adsorption data was in agreement with the Langmuir adsorption isotherm, the saturated adsorption was 7.49 mg / g and the adsorption equilibrium constant was 7.38 L / mg . On the concentration of 10mg / L of fluorine-containing water samples dosing 3g / L adsorbent, the rate of removal of fluorine up to 91.4%. The pH value of the solution has an influence on the adsorption, and the optimum adsorption is at pH 4-5. The coexistence of CaCl2 in water and temperature has little effect on the adsorption. [Conclusion] The lanthanum oxide modified zeolite has strong adsorption ability to fluorine and high fluoride removing efficiency.