XMgO·YMg(OH)_2吸附剂除氟机理及其净化水的水质研究  

Removal mechanism of fluoride ion and quality of purified water using XMgO·YMg(OH)_2 adsorbent

作　　者：吕亚娟[1] 白林[1] 陈洁[1] 常国华[1] 张力[1] 

机构地区：[1]兰州城市学院绿色化学实验与教学研究所,甘肃兰州730070

出　　处：《化学研究与应用》2014年第12期1852-1858,共7页Chemical Research and Application

基　　金：甘肃省城市发展研究院科研项目(2012-GSCFY-KJ03)资助

摘　　要：研究了XMgO·YMg（ OH）2对水中氟离子的吸附性能,考察了吸附时间、吸附剂用量、含氟水pH值、温度、含氟水初始浓度等因素对吸附的影响。实验结果表明,在较宽的pH （3．4~8．4）值和水温（22~51℃）范围内,XMgO·YMg（OH）2对水中氟离子具有极强的吸附能力,室温下0．4gXMgO·YMg（OH）2可将100mL浓度为30mgF-1·L^-1含氟水处理为符合含氟标准的饮用水。氟离子在 XMgO·YMg（OH）2上的吸附速率较大,30min内基本达到吸附平衡,吸附平衡符合Langmuir方程,在50min内达到饱和吸附,室温下饱和吸附量为13．46mg·g^-1。净化水呈微碱性,含有5．68~15．07mg·L^-1 Mg2＋,有益于人体健康。吸附饱和后的XMgO·YMg （ OH）2经焙烧再生,除氟率可达81%。The adsorptioncapacityof XMgO·YMg（ OH） 2 to fluoride ion in water was studied. The effects of adsorption time,dosage of adsorbent,pH value,temperature andinitialconcentration of fluoride-containing solutionon the adsorptivity were investigated. The ex-perimental resultsshownthat the calcined XMgO·YMg （ OH ） 2 has an excellentadsorption capacity to fluoride ion in waterat a widerange ofpH（3. 4~8. 4）andtemperature（22~51℃）value. This adsorbent can decreasethe concentration of F-from 30mg·L^-1 to 1mg·L^-1（the standard of drinking water）using4g·L^-1 of calcined XMgO·YMg（OH）2 at room temperature. The adsorption equilibri-umwas reached within30min,saturated adsorption in 50min and conformed to the Langmuir isotherm equation,the saturated adsorp-tion capacity was 13. 46mg·g^-1 at room temperature. The purified water containing 5. 68~15. 07 mg·L^-1 Mg2＋with slightly alkaline which beneficial to human health. The percentage of fluoride ion removal was up to 81%when the adsorbent reused after recovery by thermal decomposition method. In addition,this paper also discussed theremoval mechanism of fluoride ion.

关 键 词：XMgO·YMg(OH)2 除氟机理 吸附性能 净化水水质 回收再利用 

分 类 号：O611.6[理学—无机化学]