离子液体辅助水热法制备BiVO<sub>4</sub>黄色色料及色度研究

doi:10.11896/cldb.24010243

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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.

Key words： pigment bismuth vanadate ionic liquid hydrothermal method low temperature synthesis

Published: 10 April 2025 Online: 2025-04-10

CLC number:

TB32

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	Articles by authors
	XIE Zhixiang
	PENG Yiyuan
	LIU Hanyu
	ZHU Sicheng
	CHEN Ting

Cite this article:

XIE Zhixiang,PENG Yiyuan,LIU Hanyu, et al. Synthesis and Chromatic Properties of BiVO₄ Pigment via Ionic Liquid Assisted Hydrothermal Method[J]. Materials Reports, 2025, 39(7): 24010243-5.

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https://www.mater-rep.com/EN/10.11896/cldb.24010243 OR https://www.mater-rep.com/EN/Y2025/V39/I7/24010243

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