Preparation and Properties of CaCO3-Supported Nano-TiO2 Composite with Improved Photocatalytic Performance
Abstract
:1. Introduction
2. Methods
2.1. Raw Materials and Reagents
2.2. Preparation of CaCO3–TiO2 Composite Photocatalyst
2.3. Photocatalytic Properties Test
2.4. Characterization
3. Results and Discussion
3.1. Photocatalytic Degradation of Methyl Orange by CaCO3–TiO2
3.1.1. Effect of Particle Size of CaCO3
3.1.2. Effect of Loading Amount of Nano-TiO2
3.1.3. Photocatalytic Degradation of Different Concentrations of Methyl Orange Solution by CaCO3–TiO2
3.1.4. Recycling Performance of CaCO3–TiO2 Composite Photocatalyst
3.2. Optical Performance Test
3.3. Morphology and Structure of CaCO3–TiO2 Composite Photocatalyst
3.3.1. SEM Analysis
3.3.2. XRD Analysis
3.3.3. Infrared Spectrum Analysis
4. Conclusions
- (1)
- The CaCO3–TiO2 composite photocatalyst was prepared by the co-grinding of CaCO3 and TiO2. The optimal CaCO3–TiO2 composite photocatalyst, in which the particles size of CaCO3 is 15 μm and the mass ratio of TiO2 is 40%, shows excellent photocatalytic degradation performance towards methyl orange and good recovery performance. The degradation efficiency of optimal CaCO3–TiO2 composite photocatalyst was found to be 90% and 100% after 20 and 40 min of ultraviolet light illumination, respectively. The degradation effect is comparable to pure TiO2. Moreover, its degradation effect on methyl orange is not significantly reduced after five cycles.
- (2)
- CaCO3–TiO2 composite photocatalyst is characterized by CaCO3 loaded by nano-TiO2 uniformly and completely. The dispersibility of the loaded TiO2 is significantly enhanced compared to pure TiO2, and a strong chemical bond is formed between CaCO3 and TiO2 particle interfaces. These are important mechanisms for improving the photocatalytic efficiency of nano-TiO2 and reducing the its amount in CaCO3–TiO2.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Wang, J.; Sun, S.; Pan, L.; Xu, Z.; Ding, H.; Li, W. Preparation and Properties of CaCO3-Supported Nano-TiO2 Composite with Improved Photocatalytic Performance. Materials 2019, 12, 3369. https://doi.org/10.3390/ma12203369
Wang J, Sun S, Pan L, Xu Z, Ding H, Li W. Preparation and Properties of CaCO3-Supported Nano-TiO2 Composite with Improved Photocatalytic Performance. Materials. 2019; 12(20):3369. https://doi.org/10.3390/ma12203369
Chicago/Turabian StyleWang, Jie, Sijia Sun, Lei Pan, Zhuoqun Xu, Hao Ding, and Wei Li. 2019. "Preparation and Properties of CaCO3-Supported Nano-TiO2 Composite with Improved Photocatalytic Performance" Materials 12, no. 20: 3369. https://doi.org/10.3390/ma12203369