5.
• A novel and multi-functional clay-based oil spill remediation system was constructed. • TiO2@PAL functions as a particulate dispersant to break oil slick into tiny droplets. • Effective dispersion leads to the direct contact of TiO2 with oil pollutes directly. • TiO2 loaded on PAL exhibits efficient photodegradation for oil pollutants. • TiO2@PAL shows a typical dispersion-photocatalysis synergistic remediation.
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Removing spilled oil from the water surface is critically important given that oil spill accidents are a common occurrence. In this study, TiO
2@Palygorskite composite prepared by a simple coprecipitation method was used for oil spill remediation via a dispersion-photodegradation synergy. Diesel could be efficiently dispersed into small oil droplets by TiO
2@Palygorskite. These dispersed droplets had an average diameter of 20–30 mm and exhibited good time stability. The tight adsorption of TiO
2@Palygorskite on the surface of the droplets was observed in fluorescence and SEM images. As a particulate dispersant, the direct contact of TiO
2@Palygorskite with oil pollutants effectively enhanced the photodegradation efficiency of TiO
2 for oil. During the photodegradation process, •O
2−and •OH were detected by ESR and radical trapping experiments. The photodegradation efficiency of diesel by TiO
2@Palygorskite was enhanced by about 5 times compared with pure TiO
2 under simulated sunlight irradiation. The establishment of this new dispersion-photodegradation synergistic remediation system provides a new direction for the development of marine oil spill remediation.
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