Fabrication of submicron barium sulfate aggregates in the presence of ethylenediaminetetraacetic acid anions--颗粒学报PARTICUOLOGY

Hu, L., Wang, G., Yang, C., & Cao, R. (2015). Fabrication of submicron barium sulfate aggregates in the presence of ethylenediaminetetraacetic acid anions. Particuology, 22, 157-162. https://doi.org/10.1016/j.partic.2014.11.009

Fabrication of submicron barium sulfate aggregates in the presence of ethylenediaminetetraacetic acid anions

Linna Hu ^a *, Guangxiu Wang ^a, Chun Yang ^a, Rong Cao ^b

a School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China
b Baoding Lucky Innovative Materials Co., Ltd., Baoding 071000, China

10.1016/j.partic.2014.11.009

Volume 22, October 2015, Pages 157-162

Received 4 August 2014, Revised 27 October 2014, Accepted 2 November 2014, Available online 11 March 2015, Version of Record 4 August 2015.

E-mail: hln@hebut.edu.cn; 18002136882@163.COM

Highlights

• Monodispersed spherical BaSO₄ aggregates with an average size of 0.5 μm were fabricated at pH 7.

• The as-prepared particles were composed of interconnected nanoballs and self-assembled structures.

• Surface self-assembly and transformation mechanism was proposed which was directed by EDTA anions.

• The adsorption of OH⁻ anions onto the surface of BaSO₄ influenced the particle morphology.

Abstract

Barium sulfate aggregates with an average size of 0.5 μm were synthesized at pH 7, directed by ethylenediaminetetraacetic acid (EDTA) anions. The particle morphology, chemical composition, and size distribution of the BaSO₄ aggregates were characterized. The as-synthesized BaSO₄ particles were spherical and comprised many interconnected nanoballs, of which the surface properties were affected by the EDTA anions. The adsorption of EDTA anions reversed the charge and weakened the surface polarity of BaSO₄, instigating the formation of aggregates by a self-assembly and transformation process. The resulting BaSO₄ particles at pH 9–10 were ellipsoidal and featured smooth surfaces. Based on the zeta potential of BaSO₄, variations in the morphology induced by changes in pH were closely related to the adsorption of mono- and multi-valent anions onto the electrical double layer of BaSO₄.

Graphical abstract

Keywords

Barium sulfate; EDTA anion; Particle morphology; Self-assembly; pH value

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