4.7 Article

A π-π stacking perylene imide/Bi2WO6 hybrid with dual transfer approach for enhanced photocatalytic degradation

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 582, Issue -, Pages 1021-1032

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.09.013

Keywords

Organic-inorganic hybrid; Perylene imide; Singlet oxygen; Photo-induced charge carrier transfer; Energy transfer

Funding

  1. National Natural Science Foundation of China [51973148, 21938006, 51573122, 21722607, 21776190]
  2. National Key Technology RD Program [2017YFC0210901, 2017YFC0210906]
  3. Natural Science Foundation of the Jiangsu Higher Education Institutions of China [17KJA430014, 17KJA150009]
  4. Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
  5. Undergraduate Training Program for Innovation and Entrepreneurship, Soochow University

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The new PI@BWO hybrid photocatalyst showed enhanced photocatalytic activity and stability for BPA degradation, with the 30% PI@BWO demonstrating optimal degradation efficiency. The Tt-conjugation of PI facilitated charge carrier separation and utilization of sunlight, while the introduction of BWO nanosheets enhanced adsorption capacity and provided more active sites.
A new broad-spectrum responsive organic-inorganic hybrid photocatalyst (PI@BWO) was successfully prepared by in-situ growing Bi2WO6 nanosheets onto the surface of Tt-Tt stacking perylene imide. The obtained PI@BWO hybrids with different composition exhibited enhanced photocatalytic activity for Bisphenol A (BPA) degradation. Among them, 30% PI@BWO exhibited optimal photocatalytic degradation efficiency, which is 2.6 and 3.9 times higher than that of pristine PI and BWO, respectively. Furthermore, PI@BWO also performed good stability and recyclability. Remarkably, the Tt-conjugation of PI facilitated the separation of charge carriers and improved the utilization of sunlight for PI@BWO. The introduction of BWO nanosheets also enhanced the adsorption capacity for contaminants and provided much more plen-tiful active sites, promoting the next photocatalytic reaction. Most importantly, PI@BWO could produce abundant reactive species (such as O-1(2) and center dot OH) via the charge carrier transfer and energy transfer dual transfer approach, therefore leading to stronger oxidation ability. The photocatalytic degradation mechanism and pathway of the PI@BWO hybrids were finally proposed. Overall, this present work might provide a new insight into the designing and preparation of efficient organic-inorganic hybrid photocat-alysts for environmental-friendly removal of hazardous organic pollutants. (c) 2020 Elsevier Inc. All rights reserved.

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