硅胶负载氧化锆的吸附除氟研究

用静态吸附法研究了硅胶负载氧化锆的吸附除氟性能，考察了溶液pH、吸附剂投加量、初始浓度以及不同温度和不同初始浓度下吸附时间对吸附的影响．结果表明，溶液pH对吸附有很大影响，最大吸附的pH值为3～4．吸附速率可用拟二级动力学方程描述，200min内可达到吸附平衡．吸附等温线符合Langmuir方程，计算的吸附平衡常数为1．31L／mg，饱和吸附量为7．46mg／g，表明该吸附剂对氟有较大的亲和力和高的饱和吸附量．

Absorption Removal of Fluoride from Aqueous Solution by Using Silica Gel Loaded with Zirconium Oxide

The removal of fluoride from aqueous solution by using silica gel loaded with zirconium oxide was studied with batch equilibration technique. Influence of pH, adsorbent dose, initial concentration and contact time at different temperatures and different initial concentrations on the absorption were investigated. The resuits showed that pH of the solution influenced the adsorption significantly. The optimized pH was 3 -4. The absorption rate could be described by pseudo - second - order kinetics equation and the adsorption equilibrium could reach in 200min. The absorption isotherms could be modeled by Langmuir equation. The equilibrium constant and saturated absorption amount calculated from Langmuir equation were 1.31 L/mg and 7.46mg/g, respectively, showing that the absorbent has strong absorption affinity and high saturated absorption amount.