有机化改性海泡石对六六六吸附性能的探讨

Adsorption activity of hexachlorocyclohexance on organic modified meerschaum

分别采用阴阳离子表面活性剂对海泡石进行有机化改性处理,并对改性海泡石进行了吸附六六六实验。结果表明,未经有机化改性的海泡石对六六六各异构体去除能力由小到大依次为:γ六六六(12.66%)、δ六六六(12.79%)、α六六六(17.35%)、β六六六(33.57%)。经DOSO3Na有机化改性的海泡石对六六六各异构体的去除能力由小到大依次为:β六六六、γ+δ六六六、α六六六。经CTMAB有机化改性的海泡石对六六六各异构体的去除能力由小到大依次为:β六六六、α六六六、γ+δ六六六。有机化改性海泡石使体系中β六六六大幅度增加,可能为有机化海泡石催化α、γ、δ各异构体向β异构体转化。

The present paper is aimed at reporting its study and analysis of the adsorption of hexachlorocyclohexance （HCH） to meerschaum as a kind of organic modified one by anion and cation surfactant and its effect of pH value. As a result of our study, the SEM （scanning electron microscope） photographs of samples show that the structure of natural meerschaum was nothing but sodium dodecanesulphonate modified meerschaum. As the adsorption experiments indicate that both natural and organic modified meerschaum are able to remove HCH isomers because of the adsorption. The adsorption of HCH isomers on the cetyl trimethyl ammonium bromide modified meerschaum seems better than that on sodium dodecanesulphonate modified. According to the removing ability, the order from the highest rate to lowest can be listed as follows, the highest is β-HCH （33.57 % ）, with α-HCH （17.35%） followed by δ-HCH（ 12.79% ） and then γ-HCH （12.66%） in turn. The highest removing rate of the HCH isomers on sodium dodecanesulphonate modified meerschaum was α-HCH, with γ-HCH being next, and then by β-HCH. The highest removing rate of the HCH isomers on cetyl trimethyl ammonium bromide modified meerschaum was γ ＋ δ-HCH, followed by α-HCH, and then β-HCH. The transition from α-HCH, γ-HCH and β-HCH to δ-HCH catalyzed by organic modified meerschaum was perhaps the main reason. The adsorption of HCH isomers on organic modified meerschaum was better when pH was above 11. Thus, it can be seen that the method is simple in use and cheap in consumption with no secondary pollution, and in turn, the adoption of meerschaum for adsorption of HCH isomers in polluted soils are therefore prospected.