Fan Hougang, Chen Dandan, Ai Xuefeng, Han Shuo, Wei Maobin, Yang Lili, Liu Huilian, Yang Jinghai
Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University Changchun 130103 PR China
National Demonstration Center for Experimental Physics Education, Jilin Normal University Siping 136000 PR China.
RSC Adv. 2018 Jan 3;8(3):1398-1406. doi: 10.1039/c7ra11055c. eCollection 2018 Jan 2.
Several activated fly ash cenosphere (AFAC) supporting TiO coated ZnFeO (TiO/ZnFeO/AFAC) photocatalysts were prepared by sol-gel and hydrothermal methods. These photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), UV-vis diffuse reflectance spectroscopy (UV-DRS) and nitrogen adsorption analyses for Brunauer-Emmett-Teller (BET) specific surface area measurements. We found that the main components of spherical AFAC were mullite (AlSiO) and SiO; the crystallite size of the TiO/ZnFeO nanocomposite was less than 10 nm and its specific surface area was 162.18 m g. The TiO/ZnFeO nanocomposite had a band-gap of 2.56 eV, which would photodegrade 95% of rhodamine B (RhB) under visible light within 75 min. When hybridized with 0.02 g AFAC, the TiO/ZnFeO/0.02 g AFAC photocatalyst with a band-gap of 2.50 eV could remove 97.1% of RhB and be reused three consecutive times with minor decrease in photocatalytic performance. However, the photocatalytic performance decreased to 91.0% on increasing the dosage of AFAC to 0.30 g. The mesoporous structure of all the photocatalysts and the strong adsorption ability of AFAC accounted for the notable performance.
通过溶胶 - 凝胶法和水热法制备了几种负载TiO包覆ZnFeO（TiO/ZnFeO/AFAC）的活性粉煤灰空心微珠（AFAC）光催化剂。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FT-IR）、紫外 - 可见漫反射光谱（UV-DRS）以及用于布鲁瑙尔 - 埃米特 - 泰勒（BET）比表面积测量的氮气吸附分析对这些光催化剂进行了表征。我们发现球形AFAC的主要成分是莫来石（AlSiO）和SiO；TiO/ZnFeO纳米复合材料的微晶尺寸小于10 nm，其比表面积为162.18 m²/g。TiO/ZnFeO纳米复合材料的带隙为2.56 eV，在可见光下75分钟内可光降解95%的罗丹明B（RhB）。当与0.02 g AFAC杂化时，带隙为2.50 eV的TiO/ZnFeO/0.02 g AFAC光催化剂可去除97.1%的RhB，并且可以连续重复使用三次，光催化性能略有下降。然而，当AFAC的用量增加到0.30 g时，光催化性能降至91.0%。所有光催化剂的介孔结构以及AFAC的强吸附能力是其显著性能的原因。
