载锆凝胶吸附除氟研究

以凝胶为材料,利用锆和氟可以形成配合物,通过接枝二乙烯三胺、载锆,得到载锆凝胶。载锆凝胶在15℃,pH约为6,振荡速度为120次/min,吸附时间为180 min时,可以固液比为0.003 g/mL除去10 mg/L的氟溶液中90.48%的氟离子,使其符合国家饮水标准。载锆凝胶适于处理偏酸性的含氟水。Na+、K+、Mg2+、Ca2+、NO-3、Cl-对载锆凝胶除氟基本无影响,H2PO-4、SO2-4影响适中,CO2-3影响严重。载锆凝胶吸附氟可用Langmuir等温吸附模型描述。15℃下,根据Langmuir模型计算得到的最大吸附量为10.31 mg/g。

Study on removing fluoride in water by adsorption of the loading-zirconium gel

According to the fact that zirconium and fluoride could form a complex,based on gel material, through grafting diethylenetriamine,followed by loading zirconium,the loading-zirconium gel was gained. At 15 ℃,pH 6,shaking rate of 120 times/ min,adsorption time for 180 min,solid-liquid ratio of 0. 003 g/ mL, using the loading-zirconium gel,fluorine ions under the concentration of 10 mg / L were removed to 90. 48% ,which made it reached national standard of drinking water. The loading-zirconium gel was suit-able for dealing with weakly acidic water containing fluorine. Na ＋ ,K ＋ ,Mg2 ＋ ,Ca2 ＋ ,NO -3 ,Cl - almost had no effect on defluorination,and the effect of H2 PO -4 and SO2 -4 was moderate,while CO2 -3 affected the ad-sorption for fluoride badly. The adsorption for fluoride by the loading-zirconium gel could be described by Langmuir isotherm model. At 15 ℃ ,according to Langmuir isotherm model,the calculated maximum ad-sorption capacity was 10. 31 mg / g.