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Preparation of Calcined kaolinite/TiO2 composites by titanyl sulfate (TiOSO4) hydrolysis precipitation.

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Title: Preparation of Calcined kaolinite/TiO2 composites by titanyl sulfate (TiOSO4) hydrolysis precipitation.
Authors: Lin, Minghao1 (AUTHOR), Wang, Gangan1 (AUTHOR), Li, Junqi1,2 (AUTHOR) jqli@gzu.edu.cn, Chen, Chaoyi1 (AUTHOR), Lan, Yuanpei1 (AUTHOR)
Source: Journal of Molecular Structure. Jul2025, Vol. 1335, pN.PAG-N.PAG. 1p.
Subjects: Phase transitions, Titanium dioxide, Chemical stability, Pollution, Energy consumption
Abstract: • Finely controlling the hydrolysis conditions enables efficient deposition of TiO 2 on the CK surface. Reduce the production cost of TiO 2 , reduce environmental pollution and energy consumption. • Clarify the important role of the surface active sites of the matrix material in chemical coating. • The composite material exhibits good pigment properties. Calcined kaolinite (CK)/TiO 2 composites were synthesized through hydrolysis precipitation of titanyl sulfate (TiOSO 4) and calcination. Under optimized hydrolysis conditions (pH 2.5, duration 2.0 h, temperature 90 °C, and mass ratio (TiO 2 /CK) = 1.0), a precipitation efficiency of 81.4 % was achieved. The phase composition remained consistent under varying hydrolysis conditions after significant TiO 2 formation. Furthermore, the oil absorption (mass ratio = 2.0) and hiding power (mass ratio = 1.4) of the composites were determined to be 38.8 g/100 g and 88.4 %, respectively. The composites exhibited high good chemical stability as a pigment, maintaining resistance to strong acid erosion, with only 4.0 % dissolution observed after a 15-day immersion in a pH 2.0 solution. H 2 TiO 3 underwent the dehydration and desulfurization more rapidly in an oxygen-rich environment, and anatase formation was well-developed at a calcination temperature of 750 °C for 1 h. Further analysis revealed that phase transition process of TiO 2 was influenced by TiO 2 content, disordered structure of CK and calcination conditions. TiO 2 particles formed single- or multi-layered chemical coatings on the active CK surface, although the presence of exposed mullite impeded coating formation. This study successfully developed cost-effective CK/TiO 2 composites with favorable pigment properties, providing a certain reference for CK selection. The composites have potential applications in coatings, pigments and related fields. [Display omitted] [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:• Finely controlling the hydrolysis conditions enables efficient deposition of TiO 2 on the CK surface. Reduce the production cost of TiO 2 , reduce environmental pollution and energy consumption. • Clarify the important role of the surface active sites of the matrix material in chemical coating. • The composite material exhibits good pigment properties. Calcined kaolinite (CK)/TiO 2 composites were synthesized through hydrolysis precipitation of titanyl sulfate (TiOSO 4) and calcination. Under optimized hydrolysis conditions (pH 2.5, duration 2.0 h, temperature 90 °C, and mass ratio (TiO 2 /CK) = 1.0), a precipitation efficiency of 81.4 % was achieved. The phase composition remained consistent under varying hydrolysis conditions after significant TiO 2 formation. Furthermore, the oil absorption (mass ratio = 2.0) and hiding power (mass ratio = 1.4) of the composites were determined to be 38.8 g/100 g and 88.4 %, respectively. The composites exhibited high good chemical stability as a pigment, maintaining resistance to strong acid erosion, with only 4.0 % dissolution observed after a 15-day immersion in a pH 2.0 solution. H 2 TiO 3 underwent the dehydration and desulfurization more rapidly in an oxygen-rich environment, and anatase formation was well-developed at a calcination temperature of 750 °C for 1 h. Further analysis revealed that phase transition process of TiO 2 was influenced by TiO 2 content, disordered structure of CK and calcination conditions. TiO 2 particles formed single- or multi-layered chemical coatings on the active CK surface, although the presence of exposed mullite impeded coating formation. This study successfully developed cost-effective CK/TiO 2 composites with favorable pigment properties, providing a certain reference for CK selection. The composites have potential applications in coatings, pigments and related fields. [Display omitted] [ABSTRACT FROM AUTHOR]
ISSN:00222860
DOI:10.1016/j.molstruc.2025.141989