The Effects Of Surfactants On The Adsorption And Photodegradation Of Hydrophobic Organic Compounds By Metalic Oxides

The analysis of adsorption and photodegradation of hydrophobic organic pollutants are conducted in this thesis. With the adsorptive and photodegradative theory of the solid — liquid interface, the adsorption experiments and the still photodegradation after adsorption are studied. The effects of pH on the adsorption of organic compounds on the solid—liquid interface, and the different adsorptive behaviors of three kinds of metallic oxides are investigated. In addition, the effects of ionic surfactant on the adsorption of hydrophobic organic compounds are discussed. Based on these results, under the illumination of artificial UV-lamp, the photodegradation of pollutants are studied further. The titanium dioxide or ferroferric oxide are regarded as photochemical catalyst. The effects of ionic surfactant on the photodegradation of pollutants are studied emphatically. The mainly results are summarized as follows:In the neutral aqueous solution, the surface of these metallic oxides is all hydrophilic. So the adsorbabilities of metallic oxides to hydrophobic organic compounds are insignificant. While the pH decreased, the adsorptive capabilities are enhanced. When pH=4, the adsorbance of methyl parathion on three kinds of adsorbents are in the order of TiO2 > Fe3O4 > Al2O3; the adsorbance of carbaryl on adsorbents are in the order of Fe3O4 > TiO2 > Al2O3; the adsorbance of naphthalene on adsorbents are in the order of TiO2 > Fe3O4 > Al2O3. It shows that the adsorbability of TiO2 or Fe3O4 is better than Al2O3 to adsorb the single pollutant in the solution.