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Constructing the Pd/PdO/β‐Bi 2 O 3 microspheres with enhanced photocatalytic activity for Bisphenol A degradation and NO removal
Author(s) -
Rao Fei,
Zhu Gangqiang,
Wang Miaomiao,
Zubairu Siyaka Mj,
Peng Jianhong,
Gao Jianzhi,
Hojamberdiev Mirabbos
Publication year - 2020
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.6276
Subject(s) - photocatalysis , bisphenol a , radical , photodegradation , hydroxyl radical , photochemistry , degradation (telecommunications) , chemistry , electron paramagnetic resonance , catalysis , materials science , organic chemistry , telecommunications , physics , nuclear magnetic resonance , computer science , epoxy
BACKGROUND Photocatalysis is one of the effective ways to solve the problem of water and gas pollution. An excellent photocatalyst should have the following advantages: efficient photocatalytic activity for gas and water pollutants, recyclable and stable characteristics, non‐toxic and low‐cost. Constructing heterojunctions and introducing oxygen vacancies (OVs) are two effective measures to achieve these targets. RESULTS It is found that the 1.0% Pd/PdO/β‐Bi 2 O 3 exhibits the best photocatalytic activity with an efficiency of 97.4% for Bisphenol A (BPA) degradation and 47.6% for nitric oxide (NO) removal within 30 min. The 1.0% Pd/PdO/β‐Bi 2 O 3 composite shows 23.3% efficiency in the photodegradation of BPA under 595 nm monochromatic light irradiation, while β‐Bi 2 O 3 tends to be invalid. Moreover, the OVs promote the removal of NO without irradiation. CONCLUSION In this work, a novel ternary Pd/PdO/β‐Bi 2 O 3 material as high‐performance photocatalyst for the BPA degradation and NO removal was synthesized. The presence of OVs promotes the activation of the oxygen molecule, thereby facilitating the photocatalytic process. The p ‐ n junction of PdO/β‐Bi 2 O 3 and the Schottky barrier of Pd/β‐Bi 2 O 3 significantly limit the recombination of photoinduced electron–hole pairs in the composite. Furthermore, an artifact in the electron spin resonance (ESR) spectrum obtained by spin trapping with 5,5‐dimethyl‐1‐pyrroline N ‐oxide (DMPO) as adducts confirms that both hydroxyl radical (•OH) and superoxide radical (•O 2 − ) species are involved in the photocatalytic process. The present work offers a new perspective for developing the composite photocatalysts with high efficiency through loading of metal nanoparticles and creating an heterojunction. © 2019 Society of Chemical Industry