Efficient construction of calcium fluoride nanoaggregates for enhanced water vapor adsorption--颗粒学报PARTICUOLOGY

Yang, D.-L., Cao, J., Liu, R.-K., & Wang, J.-X. (2024). Efficient construction of calcium fluoride nanoaggregates for enhanced water vapor adsorption. Particuology, 89, 191-197. https://doi.org/10.1016/j.partic.2023.11.008

Efficient construction of calcium fluoride nanoaggregates for enhanced water vapor adsorption

Dan-Lei Yang^a, Jing Cao^{b c d}, Rong-Kun Liu^{b c}, Jie-Xin Wang ^{b c *}

a School of Life Sciences and Chemical Engineering, Jiangsu Second Normal University, Nanjing, 210013, China
b State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
c Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
d Petrochemical Research Institute, PetroChina, Beijing, 102206, China

10.1016/j.partic.2023.11.008

Volume 89, June 2024, Pages 191-197

Received 7 October 2023, Revised 7 November 2023, Accepted 8 November 2023, Available online 20 November 2023, Version of Record 8 December 2023.

E-mail: wangjx@mail.buct.edu.cn

Highlights

• CaF₂ nanoaggregates (NAs) were efficiently constructed by spray drying technology.

• CaF₂ nanoparticles (NPs) with two zeta potentials as building blocks were prepared.

• CaF₂ NAs exhibited enhanced water vapor adsorption properties compared to CaF2 NPs.

Abstract

Calcium fluoride (CaF₂) is an ideal adsorbent for the dehydration of gaseous hydrogen fluoride (HF) containing water vapor. In this work, a novel CaF₂ absorbent, spherical CaF₂ nanoaggregates (NAs) with a closely packed structure, was proposed and efficiently fabricated by spray drying technology. As the building blocks of CaF₂ NAs, the CaF₂ nanoparticles (NPs) were prepared by the addition of excess calcium ions (Ca²⁺) or fluorine ions (F⁻) in the synthesis. The results indicated that the CaF₂ NPs synthesized by excess Ca²⁺ and the corresponding NAs exhibited much better water vapor adsorption properties than their counterparts by excess F⁻, owing to higher zeta potentials. More importantly, whether excess Ca²⁺ or F⁻, CaF₂ NAs had further enhanced water vapor adsorption capacity compared to primary CaF₂ NPs, possibly owing to their unique nano-micro secondary structures and higher surface areas. This work has great potential in the development of high-performance absorbents for separating moisture from corrosive gas HF.

Graphical abstract

Keywords

CaF₂ nanoaggregates; Water vapor adsorption; Spray drying

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