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Acta Metall Sin  2020, Vol. 56 Issue (11): 1551-1557    DOI: 10.11900/0412.1961.2020.00062
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Ultrasonic Blending Synthesis of Ni(HNCN)2/BiVO4 Composite Visible-Light Induced Photocatalysts
ZHANG Xia(), SONG Yang, WANG Yu, JI Luhe, YANG Mei, MENG Hao
Faculty of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, China
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ZHANG Xia, SONG Yang, WANG Yu, JI Luhe, YANG Mei, MENG Hao. Ultrasonic Blending Synthesis of Ni(HNCN)2/BiVO4 Composite Visible-Light Induced Photocatalysts. Acta Metall Sin, 2020, 56(11): 1551-1557.

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Abstract  

Photocatalytic technology is gaining increasing attention as one of the key technologies in solving environmental pollution problems owing to its ability to completely decompose organic contaminants. In addition, the development of visible-light-driven photocatalysts has always been an important topic in photocatalytic fields. In this work, Ni(HNCN)2 and BiVO4 were synthesized using a simple chemical precipitation process, which was followed by the preparation of Ni(HNCN)2-BiVO4 composite particles using a simple ultrasonic blending method. The structure of the resulting composite photocatalysts was characterized via XRD, SEM, FT-IR, and UV-Vis spectra, and its photocatalytic activities in the degradation of Rhodamine B were tested. The experimental results revealed that the smaller Ni(HNCN)2 particles produced via ultrasonic treatment were deposited on the surface of BiVO4 to form a heterostructure. The bandgap of single Ni(HNCN)2, BiVO4, and Ni(HNCN)2-BiVO4 are 2.64, 2.41, and 2.37 eV, respectively. Compared to the single Ni(HNCN)2 and BiVO4 particles, there was improved sensitivity to visible light in Ni(HNCN)2-BiVO4 composites due to the narrower bandgap of the composite particles. During the photocatalytic degradation of Rhodamine B, the composite particles synthesized with 1∶2 mole ratio of Ni(HNCN)2 and BiVO4 demonstrated the best visible-light photocatalytic activity. The mechanism of the photocatalysis suggested that the matched band structure promotes the flow of the photogenerated electrons and holes at the interface, thereby improve the photocatalytic efficiency.
Key words:  ultrasonic blending synthesis      visible-light induced photocatalysis      nickel cyanamide      bismuth vanadate     
Received:  25 February 2020     
ZTFLH:  TQ13  
Fund: National Natural Science Foundation of China(21501023);National Training Program of Innovation and Entrepreneurship for Undergraduates(201910145033);the Fundamental Research Funds for the Central Universities(N182410001)
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Xia ZHANG
Yang SONG
Yu WANG
Luhe JI
Mei YANG
Hao MENG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00062     OR     https://www.ams.org.cn/EN/Y2020/V56/I11/1551

Fig.1  SEM images (a~c, e, g) and EDS analyses (d, f, h) of Ni(HNCN)2 (a), BiVO4 (b), Ni(HNCN)2/BiVO4-0.3 (c, d), Ni(HNCN)2/BiVO4-2 (e, f), Ni(HNCN)2/BiVO4-3 (g, h) (The inset in Fig.1a is the particles observed under higher magnification)
Fig.2  XRD spectra (a) and Fourier transform infrared spectroscopy (FT-IR) spectra (b) of single Ni(HNCN)2, BiVO4 and Ni(HNCN)2/BiVO4 composite
Fig.3  UV-Vis diffuse reflectance spectra of Ni(HNCN)2/BiVO4 (a) and re-plotted curves of (Ahν)2vs (hν) for Ni(HNCN)2/BiVO4 composites (b) (h—Planck constant, A—absorbance, v—frequency)
Fig.4  Photocatalytic degradation of Rhodamine B by Ni(HNCN)2 /BiVO4 composites (C—concentration at equilibrium, C0—concentration at initial, t—degradation time)
Fig.5  Mott-Schottky plots of Ni(HNCN)2 and BiVO4 particles (Csc—interfacial capacitance, E—electrode potential)
Fig.6  Schematic of band structure of Ni(HNCN)2/BiVO4 composites (Eg—band gap energy)
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