Preparation Of Modified Expanded Perlite And Photo-catalytic Degradation Of Organic Pollutants

Different floating photocatalysts including TiO2/EP、Fe3+-TiO2/EP were prepared by Sol-Gel method using different types of tetrabutyl titanate(TBT) as precursor and expanded perlite (EP) as support. Combining the light weigh and porous characteristics of expanded perlite with the surfactant adsorption efficiency for organic pollutants of TiO2photocatalytic degradation, and different environmental remediation materials showed different results. The structure characterizations of these materials were carried out by XRD and SEM, which objective grasped the changes of these materials according to comparison of different structural properties. Photocatalytic degradation of organic pollutants, such as RhodamineB, methyl orange, and phenol, in polluted environment by these materials, and relevant factors affecting removal effects were studied. The effect of Fe3+-TiO2or TiO2surface-modified EP on remediation to phenol contaminated soil was also carried out.The main results were showen as follows:(1) Anatase TiO2were prepared and loaded successfully to EP; Fe3+-TiO2or TiO2surfactant may enter the space of expanded perlite.(2) EP had little ability to remove Rhodamine B in water, while EP modified with surfactant Fe+-TiO2or TiO2could remove Rhodamine B significantly. Materials with different content of Fe3+had a relatively significant impact on degradation of Rhodamine B. The materials whose content of Fe3+being between0.1%and0.5%showed lower degradation to Rhodamine B than which do not contained Fe3+, while between0.005%and0.05%showed higher degradation than whose not contained Fe3+The material containing0.02%Fe3+has the highest degradation of Rhodamine B. The results also showed that photocatalyst modified three times has the better degradation of Rhodamine B than others. The photocatalyst activity has little change after the five times recycling, (3) Compared with EP or TiO2/EP, Fe3+-TiO2/EP had significantly higher removal rate of Methyl orange and Phenol in water, which showed15%growth in Methyl orange and10%in Phenol. Removal effects of the materials were influenced by dosage of material, illumination time, and initial concentration of Methyl orange or Phenol in water.(4) Fe3+-TiO2/EP or TiO2/EP had ability to remove phenol from contaminated soil. The former had higher degradation than the latter. Results from this study indicated that EP modified with surfactant and Fe3+-TiO2can be used as a new kind of environmental remediation material for the restoration of organic contaminated soil and water.