EDTA—NaOH—Fe2（SO4）3改性沸石除氟性能静态实验研究

为提高天然沸石除氟性能，比较了不同方法改性的沸石对水样的除氟效果，并通过静态吸附实验对其中效果最好的EDTA-NaOH—Fe2（SO4）3改性沸石进行了除氟条件优化。结果表明；以EDTA-NaOH—Fe2（SO4）3改性沸石除氟时，EDTA、NaOH和Fe2（SO4）3的最佳浓度分别为0．2mol·L-1、1．0mol·L-1和1．0mol·L-1，最佳粒径、投料量、水样pH值、吸附时间和水样温度分别为60目、5．0g·（100mL）-1、7．0、60min和50℃。含氟20．0mg·L-1的高氟水经改性沸石处理2次后，F-浓度降至1．0mg·L-1以下，符合国家生活饮用水标准。

Static Experiment Research of Fluoride Removal Performance of EDTA-NaOH-Fe2(SO4)3 Modified Zeolite

In order to improve fluoride removal performance of natural zeolite, the removing efficiency for fluoride in water sample of the zeolites modified by different methods were compared. And the fluoride remo- ving conditions for the EDTA-NaOH-Fe2 （SO4）3 modified zeolite, which had the best fluoride removal effect, were optimized by the static adsorption experiment. The results showed that when the EDTA-NaOH- Fe2（SO4）3modified zeolite was used to remove fluoride, the optimal concentration of EDTA, NaOH and Fe2 （SO4）3 was 0.2 mol·L-1 ,1.0 mol·L-1 and 1.0 mol·L-1 ,respectively,and the optimal zeolite particle size, dosage,pH value,adsorption time, and temperature were 60 mesh,5.0 g ·（100 mL）-1 ,7.0,60 min and 50 ℃, respectively. After being treated two times, the fluoride concentration of high fluoride water sample could be de- creased from 20.0 mg·L-1 to be less than 1.0 mg ·L-1 ,which met the requirement of national drinking water standard.