粘土矿物材料吸附去除水中痕量邻苯二甲酸酯

研究了天然沸石、2种有机改性沸石及Mg/Al水滑石对水中痕量邻苯二甲酸二甲酯、邻苯二甲酸二(2-乙基己基)酯和邻苯二甲酸二辛酯的等温吸附情况和吸附机理,并与活性炭的吸附性能进行了比较。结果表明,Freundlich和Langmuir吸附等温方程均可以很好地描述天然沸石和Mg/Al水滑石对邻苯二甲酸酯的吸附,2种有机改性沸石对邻苯二甲酸酯的吸附更符合Linear吸附等温方程。与活性炭相比,天然沸石对邻苯二甲酸酯的吸附效果较差;2种有机改性沸石和Mg/Al水滑石对分子尺寸较小的邻苯二甲酸酯物质邻苯二甲酸二甲酯的去除率较低,分别低31.8%、31.4%和19.8%,但对分子较大的邻苯二甲酸酯物质邻苯二甲酸二(2-乙基己基)酯和邻苯二甲酸二辛酯的去除效果相差不大。

Removal of trace phthalate esters from water with clay mineral materials

The adsorption behavior and mechanism of dimethyl phthalate, di-(2-ethylhexyl) phthalate and di-n-octyl phthalate in drinking water with natural zeolite, two kinds of organo zeolites, and Mg/Al hydrotalcite were studied, and the adsorption properties of these clay mineral materials were compared with that of activated carbon. The results showed that the adsorption isotherms of phthalate esters on natural zeolite and Mg/Al hydrotalcite simultaneously fit Langmuir isotherms and Freundlich isotherms, and the adsorption isotherms on organo zeolites are linear. Comparing with the activated carbon, the removal efficiency of phthalate esters on natural zeolite was poor, the organo zeolites and Mg/Al hydrotalcite showed a little lower removal efficiency on small molecular size phthalate ester dimethyl phthalate and almost same removal rate of larger size phthalate esters di-(2-ethylhexyl) phthalate and di-n-octyl phthalate.