Inclusion behavior of 4-nonylphenol into cyclodextrin derivatives

The solubilities of 4-nonylphenol in five kinds of hydroxypropylcyclodextri n (HP-CDs) solutions were investigated in order to evaluate them for soil r emediation. The relative aqueous-phase concentration of 4-nonylphenol linea rly increased with the increasing HP-CD concentration. The addition of HP-b eta -CD (degree of substitution, D,S, = 0.6) produced the largest change be cause the inner core of HP-beta -CD is the most hydrophobic. The solubility of 4-nonylphenol in the HP-CD solutions depended upon the cavity diameter and the degree of HP-CD substitution. Both ozone and activated carbon treat ments have been using for removing organic compounds and foul odor compound s from tap water. As the inclusion complexes moved into the groundwater, th e ozone degradation of the inclusion complexes was estimated. The 4-nonylph enol-HP-CD inclusion complexes were easily degraded by ozone. The degree of degradation increased with the increasing ozonization time. Weakly acidic compounds were produced from the 4-nonylphenol-HP-CD inclusion complexes by ozonization, HP-CDs could be used for the removal of 4-nonylphenol from so il, (C) 2001 Academic Press.