4.7 Article

Rational design 2D/2D BiOCl/H+Ti2NbO7- heterojunctions for enhanced photocatalytic degradation activity

Journal

APPLIED SURFACE SCIENCE
Volume 521, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.apsusc.2020.146334

Keywords

Nanosheets; Heterostructure; Photocatalytic degradation; Visible light

Funding

  1. National Natural Science Foundation of China [51902282, 51772258]
  2. National Key Research and Development Project [2016YFC0209202]
  3. Natural Science Foundation of the Jiangsu Higher Education Institutions of China [15KJA430007]
  4. China Postdoctoral Science Foundation [2018M632283]
  5. Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJCX19_1037]
  6. Joint Open Fund of Jiangsu Collaborative Innovation Center for Ecological Building Material and Environmental Protection Equipments and Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province [JH201808]
  7. Open Project of Key Laboratory for Ecological-Environment Materials of Jiangsu Province

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To realize highly efficient removal of organic pollutant is a hot spot in environmental and energy science. Herein, we firstly prepared re-stacked H+Ti2NbO7- nanosheets (HTN) to fabricate the novel two-dimensional (2D)-2D BiOCl/H+Ti2NbO7- (BHT) heterojunctions by a hydrothermal method. The HTN were well combined with BiOCl nanoplates with an intimate interface to form a heterostructure. The rhodamine B (RhB) molecules were used as a target pollutant to evaluate the photocatalytic performance of samples under visible light. All BHT composites, with an optimal sample of BHT-4, showed the improved photocatalytic activity for degradating RhB compared with the single BiOCl and HTN. The enhanced activity was mainly attributed to the efficient charge separation and transfer, which was resulted from the formation of heterojunction between BiOCl and HTN. The produced active species can be detected by trapping experiments and ESR spectra. It indicated that hole (h(+)) and superoxide radical (O-center dot(2)-) played a crucial role in the photocatalytic RhB degradation, while hydroxyl radical ((OH)-O-center dot) contributed a little. A possible photodegradation mechanism was also discussed based on the corresponding experimental results. This work provides an insight for preparing 2D/2D heterojunctions with a high photocatalytic activity.

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