Microwave solvothermal carboxymethyl chitosan templated synthesis of TiO2/ZrO2 composites toward enhanced photocatalytic degradation of Rhodamine B
| Autor: | Tingting Wu, Duo Pan, Qian Shao, Zhanhu Guo, Jiangyang Tian, Tao Ding, Mengyao Dong, Chengxinzhuo Jia, Junkai Zhao |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
medicine.diagnostic_test Scanning electron microscope 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry X-ray photoelectron spectroscopy chemistry Transmission electron microscopy Spectrophotometry Specific surface area Photocatalysis medicine Rhodamine B Fourier transform infrared spectroscopy Composite material 0210 nano-technology |
| Zdroj: | Journal of Colloid and Interface Science. 541:18-29 |
| ISSN: | 0021-9797 |
| Popis: | A series of TiO2/ZrO2 composites with various molar ratios of ZrO2:TiO2 were synthesized by a facile and mild microwave hydrothermal method with carboxymethyl chitosan (CMCS) as templates. The as-obtained products were characterized with wide-angle powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR), UV–vis diffuse reflectance spectrophotometry (UV–vis-DRS), N2 adsorption-desorption isotherms (BET), and X-ray photoelectron spectrometer (XPS). The TiO2/ZrO2 composites with heterogeneous structure consisted of particles which showed a better regularity and uniform with about 800 nm in diameter, and showed a larger specific surface area and smaller energy band gap than pure ZrO2. Comparative experiments including varying the pH of the solution and the content of titania demonstrated that the 5% TiO2/ZrO2 composites ( n T i : n Z r = 5:100) at pH = 10.3 possessed the best photocatalytic property. Moreover, the possible reasons for these phenomena were clarified. Cyclic experiments proved that the resulting TiO2/ZrO2 composites as photocatalyst could be reused efficiently. Meanwhile, a possible mechanism of photocatalysis was proposed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect