Abstract：Dodecyl sulfate sodium intercalated Mg3Al-NO3- hydrotalcite (SDS-HT) was assembled by one step synthesis, anion exchange and rehydration of the calcined hydrotalcite. The structural properties of SDS-HT were characterized by XRD, FT-IR, TEM, TOC and NMR. The adsorption properties of p-nitrotoluene on SDS-HT and the adsorption mechanism was investigated. In addition partition and adsorption contributions to the adsorption amount of p-nitrotoluene on the SDS-HT were quantitatively described. 3 samples prepared by different modification methods had the typical layered double hydroxides structure, and the sample synthesized by rehydration of the calcined hydrotalcite had the highest content of SDS. Anion surfactant SDS formed organic phase in SDS-HT, and the organic phase affected the ration of adsorption of p-nitrotoluene between the surface adsorption and partition. All samples adsorbed p-nitrotoluene effectively, and the effect of adsorption mainly resulted from surface adsorption. The maximum adsorption was 44.5mg/g, which was achieved at 162mg/L p-nitrotoluene aqueous solution on the sample of rehydration of the calcined hydrotalcite.
