两种盐复合改性活性氧化铝对水中氟的吸附特性  

Adsorption characteristics of floride on activated alumina modified with ferric and aluminum salt

作　　者：段颖[1] 杨琰琰 张小凤[1] 王晨晨[1] 徐微[1] 李学德[1] 

机构地区：[1]安徽农业大学资源与环境学院农业部合肥农业环境科学观测实验站,合肥230036

出　　处：《环境化学》2014年第11期1950-1956,共7页Environmental Chemistry

基　　金：国家863课题(2012AA062605)资助

摘　　要：采用Fe2(SO4)3和Al2(SO4)3两种盐对活性氧化铝进行改性,通过静态吸附实验,研究了改性活性氧化铝对水中氟离子的吸附特性及影响因素.改性后的活性氧化铝吸附容量显著提高,25℃下吸附容量达到6.25 mg·g-1.改性活性氧化铝对氟的吸附动力学符合拟二级动力学模型,吸附等温线更符合Langmuir等温吸附规律.吸附过程ΔG0<0、ΔH0>0、ΔS0>0,表明改性吸附剂对氟的吸附是自发的,是吸热、熵增加的反应.吸附最佳p H值为6,吸附过程中,共存PO3-4对吸附效果影响最大.Activated alumina was modified with Fe2（ SO4）3and Al2（ SO4）3in this study. The maximum sorption capacity of modified activated alumina for fluoride was 6. 25 mg·g- 1at 298 K,significantly higher than the unmodified absorbent. The fluoride adsorption kinetics on the modified activated alumina was well described by the pseudo-second-order kinetic model. The fluoride adsorption on the modified activated alumina was consistent with the Langmuir model. During the adsorption,ΔG0〈 0,ΔH0〉 0,ΔS0〉 0. It indicated that the adsorption of fluoride is a spontaneous and endothermic process. Maximum fluoride removal occurred at p H 6. Fluoride sorption was mainly influenced by the presence of PO3-4.

关 键 词：改性活性氧化铝 氟 吸附 动力学 热力学 

分 类 号：TQ133.1[化学工程—无机化工] TU991.2[建筑科学—市政工程]