Preparation of a composite material for the uptake of bisphenol A from aqueous solutions, the dodecylsulfate ion-intercalated Mg-Al layer-structured double hydroxide particles

摘要

The preparation of Mg-Al layer-structured double hydroxide (Mg-Al LDH) particles equipped with the function of an organic acid has been attempted by modifying the interlayer with dodecylsulfate ion (DS~-). Mg-Al LDH, which had DS~- intercalated in the interlayer, was synthesized by the dropwise addition of a solution of Mg(NO_3)_2 and Al(NO_3)_3 to an aqueous solution of sodium dodecylsulfate at a constant pH of 10.0. The DS~- -modified Mg-Al LDH particle was found to have an uptake capacity for bisphenol A in an aqueous solution. This indicates that the function of DS~- as an organic material was adequately maintained in the interlayer of the Mg-Al LDH. The uptake capacity increased with the increasing content of DS~- intercalated in the interlayer. The bisphenol A uptaken by the DS~-intercalated Mg-Al LDH was confirmed to be extracted with ethanol. The DS~--intercalated Mg-Al LDH treated by the ethanol had a bisphenol A uptake capacity comparable to that of fresh LDH. These results indicate that DS~--intercalated Mg-Al LDH retains its activity during repeated cycles of the uptake and ethanol extraction of bisphenol A.