硫酸铝浸渍活性氧化铝球吸附饮水中的高浓度氟

硫酸铝浸渍活性氧化铝球（AIAA）是饮水除氟领域常用的吸附剂,它对氟的吸附性能受各种因素的影响。静态吸附通过改变AIAA质量与氟溶液体积比（m（AIAA）：V）（2～40 g.L-1）、氟的质量浓度（ρ（F））（2～100 mg.L-1）、pH值（4～10）、温度（11～33℃）和时间等实验参数,研究这些因素对AIAA吸附除氟的影响。在11～33℃的温度范围内、pH值变化为4～10之间时,当m（AIAA）：V为20 g.L-1,3 h内处理ρ（F）为10 mg.L-1水溶液其氟的去除率可达90%以上,足以保证其满足饮用水的含氟标准。利用Langmuir和Freundlich模型对吸附数据进行了拟合研究,结果表明：在ρ（F）为2～100 mg.L-1、pH=5～10、温度11～33℃范围内,Langmuir线性拟合模型是最优拟合方式;而当溶液氟质量浓度为2～1 000 mg.L-1或2～100 mg.L-1且pH为4时,Freundlich非线性拟合模型是最优拟合方式。AIAA吸附容量随溶液氟质量浓度升高、pH降低及温度升高逐渐增加。

Adsorption of High Fluoride in Drinking Water by Aluminum Sulfate Impregnated Activated Alumina Granules

Aluminum sulfate impregnated activated alumina granules（AIAA） are the common adsorbent for high fluoride（F） drinking water,the adsorption properties of AIAA were influenced by sorts of factors.In batch adsorption experiments,the adsorption performance of AIAA in high fluoride drinking water was investigated by examining the effects of different factors,including AIAA amount to fluoride solution volume（m（AIAA）：V）（2-40 g·L-1）,fluoride mass concentration（ρ（F））（2-100 mg·L-1）,pH（4-10）,temperature（11-33 ℃） and time on fluoride adsorption.Under the conditions of 11-33 ℃,pH of 4-10,m（AIAA）：V at 20 g·L-1,AIAA could remove more than 90% F-for fluoride-containing water（10 mg·L-1） after 3 h,which satisfied sufficiently with the hygienic standard for F in drinking water.Langmuir and Freundlich models were adopted to fit the adsorption data.The results showed that the linear Langmuir model was the best fitting method at ρ（F） from 2 to 100 mg·L-1,pH from 5 to 10 and temperature from 11 to 33 ℃;and the non-linear Freundlich model was the best fitting method at ρ（F） from 2 to 1 000 mg·L-1 or at ρ（F） from 2 to 100 mg·L-1,and pH at 4.With the increasing of ρ（F） in solution and temperature,the decreasing of solution pH,the adsorption capacity of AIAA was increased gradually.