Synthesis and Chromatic Properties of BiVO4 Pigment via Ionic Liquid Assisted Hydrothermal Method
XIE Zhixiang1, PENG Yiyuan2, LIU Hanyu1, ZHU Sicheng1, CHEN Ting2,*
1 School of Chemistry and Life, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, China 2 Institute of Materials Science & Devices, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, China
Abstract: BiVO4 yellow pigment was synthesized by ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate, [Bmim]BF4) assisted hydrothermal method using bismuth nitrate (Bi(NO3)3·5H2O) and ammonium metavanadate (NH4VO3) as raw materials. The effects of the pH value of precursor, hydrothermal temperature and reaction time on the synthesis and morphology of samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), while the chromatic value of the BiVO4 pigments was characterized by CIE-L*a*b* color system. The experimental results show that the pH value of precursor has a strong influence on the synthesis and morphology of BiVO4 pigments. It can change the ionic balance of precursor, consequently affecting the final structure and properties of BiVO4 pigments. As the pH value increases from 5 to 8, the morphology of BiVO4 pigment change from sheet-shaped to club-shaped. When pH value is 6, BiVO4 pigment with the monoclinic scheelite-structure exhibits sheet-like morphology and particle size is about 4 μm. The BiVO4 pigment can be synthesized via hydrothermal method at low-temperature. Compared with the conventional solid state method, its synthesis temperature is decreased from 650 ℃ to 160 ℃. Increase of hydrothermal temperature from 160 ℃ to 200 ℃ results in the increase of the size of samples from 4 μm to 10 μm and serious aggregation. It is found that longer reaction time is beneficial for BiVO4 crystal to nucleate and grow. After hydrothermal reaction at 160 ℃ for 2 h, the as-prepared BiVO4 pigment exhibits excellent chromatic value, as L*=76.77, a*=2.80, b*=64.59.
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2025, Vol. 39 
