Study on the photocatalytic degradation of disinfection by-product TCM in drinking water by Fe3+/GO-TiO2 thin films
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摘要: 通过溶胶凝胶法在玻璃基片上制得不同配比Fe3+掺杂量的GO-TiO2薄膜，对样品采用X-射线衍射和紫外可见光谱分析进行表征。在功率20 W，波长254 nm紫外灯下照射210 min光催化降解三氯甲烷(TCM),考察Fe3+掺杂比例、薄膜焙烧温度、薄膜层数及薄膜复用次数四方面对降解率的影响。结果表明，制得的样品均为锐钛矿型，Fe3+的掺杂使晶体粒径缩小且发生了红移现象。对TCM的降解效果随着Fe3+掺杂比例的增大而提高，400 ℃下焙烧形成的薄膜最佳。无论Fe3+掺杂与否，多次覆膜均能提高TCM降解率。各个薄膜在重复使用四次后降解能力趋于稳定。Abstract: This paper used the sol-gel method to prepare Fe3+ doped GO-TiO2 films with different proportions on glass substrates. The samples were characterized by X-ray diffraction (XRD) and ultraviolet-visible spectrometer (UV-Vis). The photocatalytic degradation of TCM was irradiated under a UV lamp with a power of 20 W and wavelength of 254 nm for 210 min to investigate the effects of Fe3+ doping ratio, film calcination temperature, film layers, and film reuse times on the degradation. The results show that the samples are anatase, and the doping of Fe3+ reduces the crystal size, and a redshift occurs. The degradation effect of TCM increases with the increase of Fe3+ doping ratio, and the film formed by calcination at 400 ℃ is the best. Whether Fe3+ is doped or not, multiple coating can improve the degradation rate of TCM. The degradation ability of each film tends to be stable after being reused four times.
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Key words:
- modified titanium dioxide /
- sol-gel method /
- photocatalytic performance /
- drinking water /
- TCM /
- degradation rate
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图 1 掺杂不同比例Fe3+的GO-TiO2粉末的XRD图谱
Figure 1. XRD patterns of GO-TiO2 samples doped with different ratios of Fe3+
图 2 不同比例Fe3+掺杂GO-TiO2样品的紫外可见漫反射光谱
Figure 2. UV-Vis DRS of Fe3+ doped GO-TiO2 samples in different ratios
图 3 不同Fe3+掺杂比例和薄膜焙烧温度对TCM降解率的影响
Figure 3. Effects of different Fe3+ doping ratios and calcination temperatures on degradation rate of TCM
图 4 不同层数薄膜降解TCM效果的对比
Figure 4. Comparison of TCM degradation results of films with different layers
表 1 掺杂不同比例Fe3+的GO-TiO2粉末的平均晶粒尺寸
Table 1. Average grain sizes of GO-TiO2 samples doped with different ratios of Fe3+
Fe3+掺杂比例/% 平均粒径/nm 0.0 24.5 0.5 13.5 1.0 12.8 1.5 12.5 2.0 12.3 2.5 11.2 
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表 2 薄膜复用降解TCM效果的对比
Table 2. Effects of reuse of various films on TCM degradation
% Fe3+掺杂比例 首次降解
降解率二次降解
降解率三次降解
降解率四次降解
降解率五次降解
降解率0.0 18.31 14.40 10.42 8.29 8.54 0.5 33.3 29.37 24.2 23.43 21.7 1.0 35.78 30.13 24.75 22.33 21.78 1.5 38.02 34.15 30.08 29.1 28.32 2.0 38.91 35.94 31.73 30.12 28.89 2.5 39.63 36.33 32.8 31.97 31.76
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