VARYING UPTAKE OF AROMATIC COMPOUNDS IN AN AQUEOUS SOLUTION BY Mg-Al LAYERED DOUBLE HYDROXIDES INTERCALATED WITH SEVERAL ORGANIC SULFONATES

摘要

Magnesium-aluminum layered double hydroxide (Mg-Al LDH) intercalated with 1-naphthol-3-sulfonate (1-N-3-S~-) was prepared by coprecipitation. The 1-naphthol-3,8-disulfonate (1-N-3,8-DS~(2-))-intercalated Mg-Al LDH could selectively take up nonionic aromatic compounds from aqueous solution. This was attributed to π-π stacking interactions between the benzene ring of the compounds and the naphthalene ring of 1-N-3,8-DS(2-) intercalated within the interlayer spaces of Mg-Al LDH. However, the 1-N-3-S~--intercalated Mg-Al LDH could hardly realize the selective uptake of aromatic compounds since its naphthalene ring is more polarized and does not easily participate in π-π stacking interactions with the phenyl groups of target aromatic compounds.