TiO 2 @palygorskite composite for the efficient remediation of oil spills via a dispersion-photodegradation synergy
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RESEARCH ARTICLE
TiO2@palygorskite composite for the efficient remediation of oil spills via a dispersion-photodegradation synergy Chenchen Li, Lijie Yan, Yiming Li (✉), Dan Zhang, Mutai Bao, Limei Dong Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
HIGHLIGHTS
GRAPHIC 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.
ARTICLE INFO Article history:
Received 23 June 2020 Revised 9 October 2020 Accepted 10 October 2020 Available online 12 November 2020 Keywords: Palygorskite TiO2 Pickering emulsion Oil spill Dispersion Photodegradation
ABSTRACT 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. © Higher Education Press 2020
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Introduction
The frequent occurrence of oil spill accidents has caused severe oil pollution of marine environments (Atlas, 1995; Cheryan and Rajagopalan, 1998). Effective and ecofriendly treatment of oil pollutants is a major global challenge (Chen et al., 2019c). When marine oil spill
✉ Corresponding author E-mail: [email protected]
accidents occur, the most commonly employed strategies in response include mechanical recovery, in situ burning, and chemical remediation. Several remediation techniques have been developed in recent decades (Gong et al., 2015; Ivshina et al., 2015; Guo et al., 2019). Under appropriate circumstances, the application of dispersants is a chemical remediation technique that has become increasingly recognized to provide both a feasible and efficient method for mitigating undesirable environmental impacts; however, som
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