Synthesis and enhanced photocatalytic activity of TiO2 pillared graphene nanocomposites
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摘要: 通过水热反应合成了TiO2柱撑石墨烯复合材料, 研究了TiO2纳米颗粒及TiO2柱撑石墨烯复合材料的制备以及光催化降解亚甲基蓝性能, 探讨了制备过程中水热反应时间、水热反应步骤对TiO2纳米颗粒的影响, 并在紫外光下考察了上述两种材料对光催化性能的影响。结果表明, 利用两步水热法且反应时间为10 h时为制备复合材料的最佳条件, 在紫外光的照射下, TiO2柱撑石墨烯复合材料在降解亚甲基蓝过程中显示出更高的光催化效率, 这项工作开辟了一条新的制备石墨烯–半导体复合材料的途径。Abstract: TiO2 pillared graphene nanocomposites were synthesized by hydrothermal treatment in this paper, the TiO2 nanoparticles and TiO2 pillared graphene nanocomposites were prepared in different reaction times and reaction procedures, and the properties of catalytic degradation on methylene blue (MB) were studied. In the results, the optimum conditions for preparing composite materials are defined as the two-step hydrothermal method at the hydrothermal temperature of 180 ℃, the TiO2 nanoparticles exhibits good crystal structure, and the nanocomposites show a higher photocatalytic efficiency in the process of MB degradation. This work can open up new ways to obtain the photoactive graphene-semiconductor nanocomposites.
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Key words:
- graphene /
- TiO2 /
- nanoparticles /
- photocatalysis /
- composites
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图 1 不同水热反应时间制备的TiO2纳米颗粒X射线衍射图谱
Figure 1. XRD patterns of TiO2 nanoparticles prepared at different reaction time
图 2 不同水热反应步骤制备的TiO2纳米颗粒X射线衍射图谱
Figure 2. XRD patterns of TiO2 nanoparticles prepared at different reaction procedure
图 3 实验试样X射线衍射图谱: (a)石墨膨胀前后; (b) TiO2纳米颗粒及TiO2柱撑层状石墨烯纳米复合材料
Figure 3. XRD patterns of experimental samples: (a) graphite before and after expansion; (b) TiO2 nanoparticles and TiO2-graphene nanocomposites
图 4 石墨膨胀前后及石墨烯的拉曼光谱(a)和石墨烯的2D峰拟合放大图(b)
Figure 4. Raman spectra of graphite before and after expansion and graphene (a) and the enlarged fitting curve of 2D-band of exfoliation graphene product (b)
图 5 实验试样透射图: (a) TiO2柱撑层状石墨烯纳米复合材料; (b) TiO2纳米颗粒; (c)选择性区域电子衍射图
Figure 5. TEM images of experimental samples: (a) TiO2-graphene nanocomposites; (b) TiO2 nanoparticles; (c) SADE pattern of TiO2-graphene nanocomposites
图 6 TiO2纳米颗粒及TiO2柱撑层状石墨烯纳米复合材料的紫外–可见漫反射吸收光谱
Figure 6. UV-vis diffuse reflection spectra of TiO2 nanoparticles and TiO2-graphene nanocomposites
图 7 催化剂对初始浓度为10 mg/L亚甲基蓝的吸附
Figure 7. Adsorbability of MB in the initial concentration of10 mg/L by catalyst
图 8 不同光催化剂在紫外光下的降解效率(a)和亚甲基蓝的降解效率与照射时间之间的关系(b)
Figure 8. Photocatalytic degradation of MB by UV light irradiation (a) and the relationship between MB degradation efficiency and irradiation time (b)
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