pH值对纳米羟基磷灰石吸附水体中稀土离子影响的研究  

Study on the Influence of pH Value on Nano-hydroxyapatitev Adsorption of Rare-earth Ions in Polluted Water

作　　者：李伟[1] 魏正贵[1] 赵海燕[1] 李辉信[1] 胡峰[1] 

机构地区：[1]南京农业大学资源与环境学院,江苏南京210095

出　　处：《安徽农业科学》2008年第23期10164-10167,10196,共5页Journal of Anhui Agricultural Sciences

基　　金：南京农业大学优秀青年教师人才引进资金

摘　　要：[目的]研究pH值对纳米羟基磷灰石吸附水体中稀土离子的影响。[方法]用热分解法合成羟基磷灰石（HAP），并研究合成样品的组成、粒径和形状，进行HAP的溶解和修复试验。[结果]结果表明，样品为纯相HAP，形状为球形，粒径为60～8013／11。当溶液pH≤3时，HAP可迅速溶解，且在60min内将REEs^3＋全部转化为沉淀；当溶液pH≥4时，HAP的溶解速度和REEs的去除率均明显下降。HAP修复受到稀土离子污染水体的产物主要是稀土磷酸盐，溶液pH值为4、P／REEs为15／5是最佳修复条件。[结论]HAP对水溶液中稀土离子的去除受诸多因素影响。[ Objective] The aim of this paper was to study the effect of pH value on nano- hydroxyapatitev adsorption rare-earth ions in poiluted water. [ Method] Hydroxyapatite （HAP） was prepared by the pyrolysis method. The fourier transform infrared spectroscopy （FFIR）, X- ray diffractometry （XRD） and transmission electron microscopy （TEM） was used to confirm the compostion and shape of syntheticed HAP. The experiment of dissolution and rehab of HAP was carried on. [ Result] The results indicated that the HAP abtained was purity-phased and the diameters was about 60 - 80 nm with a spherical shape. The HAP remediation of contaminated waters by REEs experiments showed under pH-constant system at 3 and below, the dissolution rate of HAP was rapid, and complete conversion of REEs^3＋ to precipitation within 60 min. The dissolution rate of HAP decreased with increasing pH value, and the transformation was incomplete at pH value of 4 and above. In the constant pH systems XRD analysis indicated that rareearthapatite was the primary reaction product, the optimal conditions of rehab was pH value of 4 and P/REEs of 15/5. [ Conclusion] HAP to the removal of rare-earth ions in water solution is affected by many factors.

关 键 词：稀土离子 羟基磷灰石 稀土磷酸盐 吸附 

分 类 号：X52[环境科学与工程—环境工程]