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Open AccessArticle

Selective Fabrication of Barium Carbonate Nanoparticles in the Lumen of Halloysite Nanotubes

by Jing Ouyang 1,2,3,*, Dawei Mu 1,2, Yi Zhang 1,2, Huaming Yang 1,2 and Steven L. Suib 3
Key Laboratory for Mineral Materials and Application of Hunan Province, Central South University, Changsha 410083, China
Centre for Mineral Materials, Department of Inorganic Materials, School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Department of Chemistry, Unit 3060, University of Connecticut, Storrs, CT 06269-3060, USA
Author to whom correspondence should be addressed.
Minerals 2018, 8(7), 296;
Received: 21 May 2018 / Revised: 25 June 2018 / Accepted: 4 July 2018 / Published: 11 July 2018
(This article belongs to the Special Issue Mineral Materials)
Barium carbonate (BaCO3) materials with the controllable morphology of nanoparticles were selectively loaded into the lumen halloysite nanotubes (abbreviated as Hal) by a urease assisted catalytic implementation strategy. The Hal mineral was pre-treated through leaching by hydrochloric acid (abbreviated as A-Hal), resulting in increased defect sites and zeta potential. The negatively charged urease was loaded inside the positively charged A-Hal lumen, and then through the decomposition of urea catalyzed by urease to produce carbonate ions and ammonia. When Ba2+ diffused in, BaCO3 particles were selectively synthesized in the lumen of A-Hal, the pore channels of A-Hal effectively controlled the growth and aggregation of BaCO3 nanocrystals and their geometrical morphology. The obtained BaCO3/A-Hal-T was characterized by transmission electron microscopy, Fourier transformation infrared spectroscopy and X-ray diffraction, differential scanning calorimetry-thermogravimetry (DSC-TG). The BaCO3/A-Hal-T may provide a candidate for potential applications. View Full-Text
Keywords: halloysite; urease; barium carbonate; selective decoration; nanoreactors halloysite; urease; barium carbonate; selective decoration; nanoreactors
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MDPI and ACS Style

Ouyang, J.; Mu, D.; Zhang, Y.; Yang, H.; Suib, S.L. Selective Fabrication of Barium Carbonate Nanoparticles in the Lumen of Halloysite Nanotubes. Minerals 2018, 8, 296.

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