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Minerals 2018, 8(7), 296; https://doi.org/10.3390/min8070296

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

1
Key Laboratory for Mineral Materials and Application of Hunan Province, Central South University, Changsha 410083, China
2
Centre for Mineral Materials, Department of Inorganic Materials, School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
3
Department of Chemistry, Unit 3060, University of Connecticut, Storrs, CT 06269-3060, USA
*
Author to whom correspondence should be addressed.
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)
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Abstract

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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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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