酸热活化累托石黏土对Sr^(2+)、Cs^+、Co^(2+)的吸附特性研究

Study on Adsorption Capacity of Acid-heat Activated Rectorite Clay for Sr^(2+), Cs^+ & Co^(2+)

累托石黏土的阳离子交换容量(CEC)为0.36mol/g,吸蓝量为0.574mol/g,胀缩度为23.89%,渗透系数为6.94×10-8cm/s。1.0mol/L盐酸活化累托石黏土对Sr2+、Cs+、Co2+的吸附量较大,分别为46.2、96.9、33.8mg/g。350℃热活化2h的累托石黏土对Co2+的吸附量为50.8mg/g,对Cs+的吸附容量为75.6mg/g,但对Sr2+的吸附量较酸活化样品及原矿的稍小。酸热活化累托石黏土对Sr2+、Cs+、Co2+的吸附量随吸附时间的延长而逐渐增大,但24h吸附基本趋于平衡。从吸附性和渗透系数分析,累托石黏土是一种较好的阻滞材料。

The CEC of rectorite is 0.36mol/g, the attract methylene blue amounts is 0.574mol/g, the expansion and contraction degree is 23.89%, and the permeability coefficient is 6.94×10^-8cm/s. The adsorption capacity of rectorite activating treated in 1.0mol/L HCl comparatively large, they are respectively 46.2mg/g, 969mg/g and 338mg/g. The adsorption capacity of rectorite clay heat activated for 2h at 350℃ for Co^2＋ is 50.8mg/g, for Cs^＋ is 75.6mg/g, but the adsorption capacity for Sr^2＋ is lower than acid activated clay and raw mineraL. The adsorption quantity of acid- heat activated rectorite clay for Sr^2＋, Cs^＋, Co^2＋ will increase with the longer of the adsorption time, and it will become fimdamentally stability at 24h. Based on the analysis of adsorbability and permeability coefficient, we can know that the rectorite clay is a good hinder material.