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目的研究载镧改性沸石对高氟水除氟的效果。方法用0.5mol/L的NaOH溶液浸泡活化沸石2h,以固液比1:5加入150g/L氯化镧溶液,以氨水调节pH值为11～12,浸渍振荡24h,干燥后于400～500℃焙烧3～4h。采用载镧改性沸石对10mg/L含氟水样进行静态除氟实验(适宜条件为:载镧改性沸石用量为3g/L时,pH值为4～5,140r/min振荡速度下于室温吸附200min)和动态除氟实验(适宜条件为:载镧改性沸石用量为1.33g/L,pH值为4～5,室温下以4～5ml/min的流速通过吸附柱)。并拟合Langmuir吸附等温线。结果静态除氟的除氟率在90%以上,吸附容量为3.24mg/g;动态除氟的吸附容量为7.67mg/g。拟合Langmuir吸附等温线所得方程为y=0.1334x+0.0181,相关系数达到0.9974,饱和吸附量(q∞)为7.50mg/g,吸附平衡常数(KL)为7.37L/mg。结论载镧改性沸石对高氟水除氟容量大,除氟效率高。
Objective To study the effect of lanthanum-modified zeolite on fluoride removal by high-fluorine water. Methods The activated zeolite was soaked in 0.5mol / L NaOH solution for 2h. The solid / liquid ratio of 1: 5 was added to 150g / L lanthanum chloride solution. The pH value was adjusted to 11-12 with ammonia solution and the solution was shaken for 24 hours. After drying, ℃ calcination 3 ~ 4h. The lanthanum-modified zeolite was used to carry out static fluoride removal experiment on 10mg / L fluorine-containing water sample (suitable conditions were as follows: lanthanum-modified zeolite dosage was 3g / L, pH value was 4-5,140r / min, Adsorption 200min) and dynamic fluoride removal experiments (suitable conditions: lanthanum modified zeolite dosage of 1.33g / L, pH 4 ~ 5, at room temperature at a flow rate of 4 ~ 5ml / min through the adsorption column). And fitted Langmuir adsorption isotherm. Results The removal rate of fluoride in static state was above 90% and the adsorption capacity was 3.24mg / g. The dynamic removal capacity of fluorine was 7.67mg / g. The equation of the fitted Langmuir isotherm was y = 0.1334x + 0.0181, the correlation coefficient was 0.9974, the saturated adsorption capacity (q∞) was 7.50mg / g and the adsorption equilibrium constant (KL) was 7.37L / mg. Conclusion lanthanum modified zeolite fluoride removal capacity of high fluoride water, fluoride removal efficiency.