Controlled preparation of micro–nano hierarchical hollow calcium carbonate microspheres by pressurized-CO2 carbonization and their CaCO3:Eu3+ photoluminescence properties. Issue 16 (9th April 2021)

• Record Type: Journal Article
• Authors: Shi, Liubin; Tang, Mingde; Muhammad, Yaseen; Tang, Yong; He, Lulu; Wang, Weichao; Tong, Zhangfa; Li, Lishuo
• Is Part Of: CrystEngComm. Volume 23:Issue 16(2021)
• Page Start: 3033
• Page End: 3042
• Publication Date: 2021-04-09
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/d0ce01854f
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Herein, calcium carbonate hollow microspheres with a micro–nano hierarchical structure were successfully synthesized using disodium salt of ethylenediaminetetraacetic acid (EDTA-2Na) as an additive, by bubbling pressurized carbon dioxide and calcium hydroxide at 120 °C. Abstract : Herein, calcium carbonate hollow microspheres with a micro–nano hierarchical structure were successfully synthesized using disodium salt of ethylenediaminetetraacetic acid (EDTA-2Na) as an additive, by bubbling pressurized carbon dioxide and calcium hydroxide at 120 °C. The products were analyzed by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller surface area analysis, thermogravimetric analysis (TGA), fluorescence analysis, and X-ray fluorescence spectrometry. Characterization results showed that the hollow calcium carbonate microspheres were 4–6 μm in diameter and the micro–nano hierarchical structure with a 100 nm wall thickness assembled into cubic shape nanoparticles. The obtained microspheres were uniformly dispersed and exhibited an 18.79 m 2 g −1 surface area. Upon increasing the preparation temperature, the morphology of the microspheres changed from a hollow sphere to a hollow ellipsoid, while with an increasing EDTA content, the size of the product decreased. Fluorescence analysis results showed that with an increasing Eu 3+ content in the obtained hollow microspheres of CaCO3 :Eu 3+, the excitation and emission spectra and the photoluminescence intensity of the product increased achieving maximum luminescence intensity at 4% content.