Preparation of CaCO3-TiO2 Composite Particles and Their Pigment Properties

Sun, Sijia; Ding, Hao; Hou, Xifeng

doi:10.3390/ma11071131

Cited by 30 publications

(13 citation statements)

References 23 publications

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“…There is a small number of uncovered CaCO 3 and a large number of coating TiO 2 on the surface of CaCO 3 -TiO 2 [18]. For CaCO 3 , its outermost surfaces are coated by TiO 2 and there are only a small number of unsaturated Ca 2+ and CO 3 2− on its surface.…”

Section: Surface Organic Modification Model Of Caco 3 -Tiomentioning

confidence: 99%

Surface Organic Modification of CaCO3-TiO2 Composite Pigment

et al. 2019

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To improve the properties and dispersibility of CaCO3-TiO2 composite pigments (CaCO3-TiO2) in organic matrices, the surface modification of CaCO3-TiO2 was performed with sodium stearate (SS) as an organic modifier by wet ultra-fine grinding in a stirred mill. The pigment properties of modified CaCO3-TiO2 and its dispersibility in organic media were tested and characterized. The binding mechanism between CaCO3-TiO2 and SS was explored by infrared spectrometry (IR) and X-ray photoelectron energy spectroscopy (XPS). The results showed that the mechanical grinding strength and SS dosage had a significant effect on the activation index and sedimentation rate of CaCO3-TiO2. After surface modification, the surface of CaCO3-TiO2 turned from a hydrophilic surface to a hydrophobic surface and the surface free energy was reduced. In addition, the hiding property and dispersibility of CaCO3-TiO2 in the organic medium were significantly improved. IR and XPS results indicated that the modifier SS was adsorbed on the surface of CaCO3-TiO2 by chemical combination.

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Section: Surface Organic Modification Model Of Caco 3 -Tiomentioning

confidence: 99%

Surface Organic Modification of CaCO3-TiO2 Composite Pigment

et al. 2019

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“…Titanium dioxide is a multifunctional material [ 9 ], highly employed in the food (chewing gum with mint flavor, dairy products) and pharmaceutical (sunscreens and toothpaste) industries [ 10 , 11 ]. However, most of the TiO 2 uses, including antibacterial activity, are usually UV-irradiation dependent [ 1 , 2 ], in particular for TiO 2 in the anatase phase (active under UV rays at a wavelength of 385 nm or shorter), which is a limiting factor for their potential applications [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of TiO2-ZnO-MgO Mixed Oxide and Their Antibacterial Activity

et al. 2019

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TiO2-ZnO-MgO mixed oxide nanomaterials (MONs) were synthetized via the sol-gel method and characterized by scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), nitrogen physisorption analysis, X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), Fourier transform infrared spectroscopy (FTIR), and color (Luminosity (L), a, b, Chrome, hue) parameters. Furthermore, the antimicrobial activity of the MONs was tested against Escherichia coli (EC), Salmonella paratyphi (SP), Staphylococcus aureus (SA), and Listeria monocytogenes (LM). The MONs presented a semi globular-ovoid shape of ≤100 nm. Samples were classified as mesoporous materials and preserved in the TiO2 anatase phase, with slight changes in the color parameters of the MONs in comparison with pure TiO2. The MONs exhibited antimicrobial activity, and their effect on the tested bacteria was in the following order: EC > SP > SA > LM. Therefore, MONs could be used as antimicrobial agents for industrial applications.

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“…In the infrared spectrum of the CaCO 3 –TiO 2 composite photocatalyst, the absorption peak at 1636 cm −1 of TiO 2 disappeared, and the absorption peak of CaCO 3 ranging from 3300 to 3500 cm −1 was weakened. It has been suggested that CaCO 3 and TiO 2 form a firm chemical combination through their surface hydroxyl groups [24].…”

Section: Resultsmentioning

confidence: 99%

Preparation and Properties of CaCO3-Supported Nano-TiO2 Composite with Improved Photocatalytic Performance

et al. 2019

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In order to improve the photocatalytic degradation efficiency of nano-TiO2, reduce its usage and realize recycling and reuse, CaCO3–TiO2 composite photocatalyst was prepared with calcium carbonate (CaCO3) and TiO2 in a grinding machine through the integration of grinding depolymerization, dispersion and particle composition. The photocatalytic degradation performance, recycling performance, structure and morphology of CaCO3–TiO2 were studied. The interaction mechanism between CaCO3 and TiO2 and the improvement mechanism for the photocatalytic performance of TiO2 were also discussed. The results show that under the UV light irradiation for 20 and 40 min, the degradation efficiency of methyl orange by the composite photocatalyst with 40% TiO2 (mass fraction) was 90% and 100%, respectively. This was similar to that of pure TiO2, and the performance of the composite photocatalyst was almost unchanged after five cycles. CaCO3–TiO2 is formed by the uniform loading of nano-TiO2 particles on the CaCO3 surface, and the nano-TiO2 particles are well dispersed. Due to the facts that the dispersion of nano-TiO2 is improved in the presence of CaCO3 and the charge transport capability is improved through the interfacial chemical bonds between CaCO3 and TiO2, the formation of this complex is an intrinsic mechanism to improve the photocatalytic efficiency of nano-TiO2 and reduce its usage in application processes.

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Preparation of CaCO3-TiO2 Composite Particles and Their Pigment Properties

Cited by 30 publications

References 23 publications

Surface Organic Modification of CaCO3-TiO2 Composite Pigment

Surface Organic Modification of CaCO3-TiO2 Composite Pigment

Synthesis and Characterization of TiO2-ZnO-MgO Mixed Oxide and Their Antibacterial Activity

Preparation and Properties of CaCO3-Supported Nano-TiO2 Composite with Improved Photocatalytic Performance

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