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Citation: Qi ZHAO, Rui-Rui LIU, Jin-Jun ZHANG, Shuai XIE, Jing WANG, Yan-Xin CAO, Zhi-Jiang JI. Three-Dimensional Flower-like Bi2WO6/BioBr Heterojunction: Preparation and Degradation Properties for Various Dyes[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(2): 321-332. doi: 10.11862/CJIC.2022.028 shu

Three-Dimensional Flower-like Bi2WO6/BioBr Heterojunction: Preparation and Degradation Properties for Various Dyes

  • State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China

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  • A three-dimensional flower-like Bi2WO6/BiOBr heterojunction was successfully prepared by a hydrothermal approach using didodecyldimethylammonium bromide (DDAB) and cetyltrimethylammonium bromide (CTAB) as structure-directing agents and Br sources. The as-prepared photocatalysts were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscopy, UV-visible diffuse reflection spectroscopy, transient photocurrent, Nyquist plots, and electron paramagnetic resonance to investigate the structure, morphology, composition, and photoelectrochemical properties. The results showed that 20-30 nm BiOBr nanoparticles were uniformly attached to Bi2WO6 sheet to form a three-dimensional flower shape structure. Compared with pure Bi2WO6, Bi2WO6/BiOBr showed a wide visible response range and effective separation efficiency of photogenerated electrons and holes. The optimum photocatalytic performance of Bi2WO6/BiOBr when wDDAB/wCTAB=2.6 was verified by photodegradation experiments. Under the irradiation of a 300 W Xe lamp with 420 nm filter, it showed the highest reaction rate constant (0.099 7 min-1) in the degradation of rhodamine B, which was about 2.7 times and 1.9 times of Bi2WO6 (0.037 6 min-1) and BT-4 (0.052 3 min-1, wDDAB/wCTAB=3.9), respectively, and the activity was no significant decrease after 6 cycles. Bi2WO6/BiOBr heterojunction can also non-selectively degrade other types of organic dyes, such as methylene blue, malachite green, and methyl orange. Finally, the photodegradation mechanism of Bi2WO6/BiOBr heterojunctions was proposed by the active species capture experiment and Mulliken theoretical calculation of atomic electronegativity.
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