Multicoating construction of BiVO4@SiO2 yellow pigment for enhanced thermal stability and acid resistance

• Published in: Journal of Coatings Technology and Research 2024-11, Vol.21 (6), p.2117-2127
• Main Authors: Zuo, Hongwei, Song, Fusheng, Zhu, Honglin, Qiu, Qiyuan, Zhu, Haoqi, Wang, Zhumei
• Format: Article
• Language: English
• Subjects: Chemistry and Materials Science; Corrosion and Coatings; Industrial Chemistry/Chemical Engineering; Materials Science; Polymer Sciences; Surfaces and Interfaces; Thin Films; Tribology
• ISSN: 1547-0091; 1935-3804
• DOI: 10.1007/s11998-024-00959-8

Monoclinic bismuth vanadate (BiVO 4 ) as an environmentally friendly bright yellow pigment has received increasing attention over the past two decades. Unfortunately, poor thermal stability and acid resistance hinder its large-scale application in the industrial field. Herein, multicoated BiVO 4 @SiO 2 yellow pigments with enhanced thermal stability and acid resistance were successfully synthesized by the hydrolysis method. The effects of process parameters such as Si/Bi molar ratio ( n Si/Bi ), water bath temperature ( T b ), and dropwise addition rate of water ( V d ) on the preparation of BiVO 4 @SiO 2 yellow pigments were systematically studied. The temperature stability of once-coated BiVO 4 @SiO 2 encapsulation pigments prepared under optimized conditions can be increased from 620 to 860°C. To further improve its thermal stability and acid resistance, the BiVO 4 pigments were wrapped multiple times and its temperature and acid resistance were evaluated. The results showed that after three times wrapping, the obtained BiVO 4 @SiO 2 showed optimal thermal stability and could maintain yellow color at 1200°C. The high-temperature stability and antiacid corrosion highlight the promise of its potential for commercial yellow pigments.