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

Hongwei Zuo*, Fusheng Song, Honglin Zhu, Qiyuan Qiu, Haoqi Zhu, Zhumei Wang*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

2 Citations (Scopus)

Abstract

Monoclinic bismuth vanadate (BiVO4) 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 BiVO4@SiO2 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 (nSi/Bi), water bath temperature (Tb), and dropwise addition rate of water (Vd) on the preparation of BiVO4@SiO2 yellow pigments were systematically studied. The temperature stability of once-coated BiVO4@SiO2 encapsulation pigments prepared under optimized conditions can be increased from 620 to 860°C. To further improve its thermal stability and acid resistance, the BiVO4 pigments were wrapped multiple times and its temperature and acid resistance were evaluated. The results showed that after three times wrapping, the obtained BiVO4@SiO2 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. © American Coatings Association 2024.
Original languageEnglish
Pages (from-to)2117–2127
JournalJournal of Coatings Technology and Research
Volume21
Issue number6
Online published12 Jul 2024
DOIs
Publication statusPublished - Nov 2024

Research Keywords

  • Acid resistance
  • Bismuth vanadate
  • Multicoating
  • Thermal stability

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