4种主要土壤对三价锑的吸附及动力学特征研究

STUDIES ON ADSORPT1ON AND KINETICS OF ANTIMONY(Ⅲ)ON FOUR SOIL SAMPLES

４种土壤对三价锑的吸附及动力学的研究结果表明，吸锑量的大小顺序为河潮土＞红壤＞紫色土．吸锑规律河潮土和紫色土呈直线型，红土红壤服从Ｌａｎｇｍｕｉｒ等温式，砂岩红壤服从Ｔｅｍｋｉｎ等温式．４种土壤的吸锑速度都很快．河潮土、砂岩红壤和紫色土的吸附动力学规律用Ｅｌｏｖｉｃｈ和双常数速率方程式能很好地描述，呈极显著正相关．由于红土红壤吸附速度太快，１～２ｍｉｎ内就几乎达到吸附平衡，不能用Ｅｌｏｖｉｃｈ和双常数速率方程式描述，相关性不显著．

Adsorption and kinetics of antimony(Ⅲ)on 4 soil samples has been studied.The results show that the order of amount of antimony(Ⅲ)adsorbed is river tidal soil>redloam >purple soil. The isotherms of antimony(Ⅲ)adsorption on river tidal soil and purplesoil are linear.Antimony(Ⅲ)adsorption of red loam soil is fit for the isothermal equation ofLangmuir,and antimony(Ⅲ)adsorption sandstone red loam is fit for the isothermal equationof Temkin. Adsorption kinetics of antimony(Ⅲ)on 4 soil samples is very rapid. The adsorp-tion kinetics of river tidal soil. Sandstone red loam and purple soil can be described excellent-ly by both Elovich and two-constant rate equations. The correlations are extremely signifi-cant. The adsorption kinetics of red loam soil is also extremely rapid,and the sorbed equilibri-um completed almost within the first 1～2min,Therefore the adsorption kinetic can not bedescribed by both Elovich and two-constant rate equations. The correlation is not significant.