摘要
利用稀土铈基无机吸附剂 (CFA)对水溶液中的氟进行了静态吸附试验和脱附再生试验 ,并对其部分物理化学特性表征和除氟机理进行了研究 .结果表明 :CFA吸附剂对氟的吸附具有较高的动力学特性和较高的吸附量 ,较低的pH值有利于对氟的吸附 ,在平衡pH 3— 6的范围内对氟的吸附量较高 ;可以用Freundlich方程表示该静态吸附的吸附等温线 ;吸附后的吸附剂可以用稀氢氧化钠溶液再生 ,脱附率达到1 0 0 % ,再生后的活性比达到 95 %以上 .
A rare earth metal based inorganic adsorbent,cerium-iron adsorbent(CFA),was developed,and its performance for fluoride removal was evaluated.The characteristics of the adsorbent were summerised.Experimental results show that rare earth metal adsorbent had a relatively high adsorption capacity and good kinetic property for fluoride ion.The highest capacity was obtained at pH 3,then it decreased with the increase of pH.The pH effect,however,became unconspicuous when the pH was over 5.The results show that the adsorption of F on CFA adsorption follows Freundlich isotherm in the tested range of F concentrations.The adsorption capacity could almost be recovered by regenerating it with 1 mol·l -1 NaOH solution.
出处
《环境化学》
CAS
CSCD
北大核心
2002年第4期365-370,共6页
Environmental Chemistry
基金
中国科学院"百人计划"资助项目
