Constructing N-Doped KNb 3 O 8 /g-C 3 N 4 Composite for Efficient Photocatalytic H 2 Generation and Degradation under Vi
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Constructing N‑Doped KNb3O8/g‑C3N4 Composite for Efficient Photocatalytic H2 Generation and Degradation under Visible Light Irradiation Chao Liu1,2 · Yao Sun2 · Yue Feng2 · Zitong Han2 · Yefan Zhao2 · Qinfang Zhang2 · Zhigang Zou1 Received: 10 February 2020 / Accepted: 17 March 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract To improve the light harvesting ability and photogenerated carriers separation, N-doped KNb3O8 supported graphitic carbon nitride (g-C3N4) was prepared by a facile calcination method using nitrogen-rich precursor of melamine for the first time. The electric structure of KNb3O8 layers was well regulated by N doping to achieve visible light response. Simultaneously, the formed g-C3N4 was combined with N-doped KNb3O8 to gain heterojunction structure. The separation, transfer and recombination processes of photogenerated charge carriers were investigated by transient photocurrent, electrochemical impedance spectra (EIS) and photoluminescence (PL) measurement. The photocatalytic performances were evaluated by H 2 generation and RhB degradation under visible light irradiation. The sample of N-doped K Nb3O8/g-C3N4 (KNCN) exhibited the high photocatalytic performance for H2 generation and RhB degradation, which is mainly attributed to the synergistic effects of the extended light harvesting ability and effective charge transportation/separation rate by N-doping and heterojunction formation, respectively. A possible mechanism for the photocatalytic degradation of RhB was proposed. Graphic Abstract A composite photocatalyst of N-doped KNb3O8 supported g-C3N4 exhibited the significant enhancement on photocatalytic performance for both H2 generation and RhB degradation, which is mainly attributed to the synergistic effects of the extended light harvesting ability and effective charge transportation/separation rate by N-doping and heterojunction formation, respectively.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10562-020-03188-x) contains supplementary material, which is available to authorized users. Extended author information available on the last page of the article
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Keywords Photocatalysis · Visible light · KNb3O8 · g-C3N4 · Heterojunction
1 Introduction With the growth of human population and development of economy, the environmental pollution and energy shortage become more and more serious nowadays [1]. It is an urgent issue to develop the clean renewable energy, hydrogen energy, which has a great potential in solving energy crisis [2, 3]. Photocatalytic technology has been regarded as a promising approach to prepare H 2 by using abundant sunlight and water resources, leading to the conversion from sunlight into fuels [4, 5]. In the past decades, various semiconductor photocatalysts, such as T iO2, MoS2, and layered metal oxides, have been carefully constructed for photocatalytic reactions [6–9]. Among these photocatalysts, layered K Nb 3 O 8 ha
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