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

Wang, Jie; Sun, Sijia; Pan, Liyang; Xu, Zhuoqun; Ding, Hao; Li, Wei

doi:10.3390/ma12203369

Cited by 18 publications

(6 citation statements)

References 26 publications

(28 reference statements)

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“…It is characterized by high purity, high whiteness, and low cost, and is significantly superior to most nonmetallic minerals in terms of cost‐effectiveness. [ 58,59 ] CaCO 3 is introduced as the photocatalyst carrier for nano‐TiO 2 to physically improve the reaction specific surface area of TiO 2 nanoparticles during photocatalysis, and proper transfer of the accumulated end products from the nano‐TiO 2 surface to release the blocked active sites fundamentally achieves the aims of anti‐inactivation, [ 60,61 ] increasing the specific surface area and maintaining high efficiency of prepared TiO 2 ‐CaCO 3 composite microparticles (TC).…”

Section: Introductionmentioning

confidence: 99%

3D‐Printed Light‐Driven Microswimmer with Built‐In Micromotors

Chen

Yang

et al. 2021

Adv Materials Technologies

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Untethered biocompatible microswimmers driven by micromotors in fluids can enable innovative technologies in fields such as biology and chemical and biomedical engineering. However, efficiently driving and controlling the movement of microswimmers by light remains a challenge. Herein, a method for fabricating a light‐driven microswimmer with built‐in micromotors and 3D‐printed multiscale features that exhibits high photocatalytic performance is proposed. TiO2‐CaCO3 composite microparticles (TC) are fabricated as highly efficient micromotors that provide high photocatalytic efficiency in bubble generation, while 3D‐printed hydrogels are fabricated as TiO2‐CaCO3/PEGDA (TC/P) microswimmers that provide biocompatibility, large specific surface area, and controllable movement. The results show that TC micromotors produced by physical mixing at a specific concentration exhibit a large specific surface area, reduced agglomeration, increased photocatalytic active sites, and improved photocatalytic stability. TC micromotors are effectively loaded into the porous hydrogel by 3D printing for multiscale fabrication to improve the photocatalytic performance across scales and realize effective and directional driving under violet light excitation. The TC/P microswimmers exhibit stable catalysis and motion in 7 days, at which point the catalysis by TiO2 is already ineffective. With stability, biocompatibility, and biomedical functions, this multiscale fabricated microswimmer exhibits great potential in micromanipulation and targeted therapy.

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Section: Introductionmentioning

confidence: 99%

3D‐Printed Light‐Driven Microswimmer with Built‐In Micromotors

Chen

Yang

et al. 2021

Adv Materials Technologies

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“…It shows that the CaCO 3 -n-TiO 2 composite exhibits similar light absorption of n-TiO 2 . This result shows that the similar properties of n-TiO 2 consist of strong photolytic degradation properties [ 42 , 43 ]. These findings lay a foundation for further understanding the photocatalytic activities and potential applications of these composite catalyst materials.…”

Section: Resultsmentioning

confidence: 82%

Development of TiO2–CaCO3 Based Composites as an Affordable Building Material for the Photocatalytic Abatement of Hazardous NOx from the Environment

Kuppusamy,

Kim,

Lee

et al. 2024

Nanomaterials

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This study explores the depollution activity of a photocatalytic cementitious composite comprising various compositions of n-TiO2 and CaCO3. The photocatalytic activity of the CaCO3–TiO2 composite material is assessed for the aqueous photodegradation efficiency of MB dye solution and NOx under UV light exposure. The catalyst CaCO3–TiO2 exhibits the importance of an optimal balance between CaCO3 and n-TiO2 for the highest NOx removal of 60% and MB dye removal of 74.6%. The observed trends in the photodegradation of NOx removal efficiencies suggest a complex interplay between CaCO3 and TiO2 content in the CaCO3–n-TiO2 composite catalysts. This pollutant removal efficiency is attributed to the synergistic effect between CaCO3 and n-TiO2, where a higher percentage of n-TiO2 appeared to enhance the photocatalytic activity. It is recommended that CaCO3–TiO2 photocatalysts are effectiveness in water and air purification, as well as for being cost-effective construction materials.

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“…The caco3+Tio2 layer, brucite and gypsum formed on specimens. But the Co2 + H2o may convert as CH3OH+ Co -+ H2 + o2 + other substances [39,40]. Here, 1-CH3OH, 2-Co -, 3-H2, 4-O2.…”

Section: Mg (Oh2) -26mmmentioning

confidence: 99%

Experimental Analysis on Properties of Engineered Cementitious Composite with Reactive Nano and Micro materials

Chowdary

Asadi

2022

Preprint

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Engineered Cementitious Composite (ECC) is one of the high-performance-based structural components. The materials used in the preparation of this composite are responsible for its characteristics. To improve structural safety against acid rains, the impact of one of the significant acids (H2So4) on mechanical, durability, and microstructural characteristics of Nano MgO based ECC with the different fine aggregates namely, Silica sand, Indian Zone II River sand and Manufactured sand is analyzed. For this, three mixes (Mix-A with silica sand, Mix-B with river sand, Mix-C with 50% River sand+ 50% Manufactured sand) were considered and cast specimens. In the composition, a suitable content of Micro MgO and Micro Tio2 are available. These specimens are kept for 28days under water curing before placing in an acidic solution and normal (atmospheric at 25 to 400C) conditions. The performance of acid (5% concentration) exposed specimens is compared with the normal atmospheric conditions after 28days. Three layers are formed on the surface of each specimen at acid exposure and 2layers are formed under normal conditions. A small layer of Caco3 + Tio2 formed on top of the specimens, this was responsible for photocatalytic action to reduce Co2 into fuels. Below this layer, the brucite layer formed on the specimens that reduced further exposure to acid. Apart from this, the Gypsum layer formed in the acid-exposed specimens. All these layers are formed by the chemical reaction of Nano MgO, Micro MgO and Tio2 with other materials. These reactions were also responsible for the almost same strength and densification under both conditions. But Mix-C showed better performance than other mixes due to the presence of high content portlandite and micro MgO that are responsible for an increase in the thickness of layers.

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

Cited by 18 publications

References 26 publications

3D‐Printed Light‐Driven Microswimmer with Built‐In Micromotors

3D‐Printed Light‐Driven Microswimmer with Built‐In Micromotors

Development of TiO2–CaCO3 Based Composites as an Affordable Building Material for the Photocatalytic Abatement of Hazardous NOx from the Environment

Experimental Analysis on Properties of Engineered Cementitious Composite with Reactive Nano and Micro materials

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