TiO2@palygorskite composite for the efficient remediation of oil spills via a dispersion-photodegradation synergy |
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Authors: | Chenchen Li Lijie Yan Yiming Li Dan Zhang Mutai Bao Limei Dong |
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Institution: | Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China |
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Abstract: | ? 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. Removing spilled oil from the water surface is critically important given that oil spill accidents are a common occurrence. In this study, TiO2@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 TiO2@Palygorskite. These dispersed droplets had an average diameter of 20–30 mm and exhibited good time stability. The tight adsorption of TiO2@Palygorskite on the surface of the droplets was observed in fluorescence and SEM images. As a particulate dispersant, the direct contact of TiO2@Palygorskite with oil pollutants effectively enhanced the photodegradation efficiency of TiO2 for oil. During the photodegradation process, ?O2?and ?OH were detected by ESR and radical trapping experiments. The photodegradation efficiency of diesel by TiO2@Palygorskite was enhanced by about 5 times compared with pure TiO2 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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Keywords: | Palygorskite TiO2 Pickering emulsion Oil spill Dispersion Photodegradation |
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