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首页> 外文期刊>RSC Advances >Mesoporous TiO2 coated ZnFe2O4 nanocomposite loading on activated fly ash cenosphere for visible light photocatalysis
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Mesoporous TiO2 coated ZnFe2O4 nanocomposite loading on activated fly ash cenosphere for visible light photocatalysis

机译：介孔TiO 2 包被的ZnFe 2 O 4 纳米复合材料负载在活性粉煤灰中空层上的可见光催化作用

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Several activated fly ash cenosphere (AFAC) supporting TiO2 coated ZnFe2O4 (TiO2/ZnFe2O4/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 (Al6Si2O13) and SiO2; the crystallite size of the TiO2/ZnFe2O4 nanocomposite was less than 10 nm and its specific surface area was 162.18 m2 g?1. The TiO2/ZnFe2O4 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 TiO2/ZnFe2O4/0.02 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.
机译：几种支持TiO 2 涂层ZnFe 2 O 4的活化粉煤灰空心层（AFAC） （TiO 2 / ZnFe 2 O 4 / AFAC）光催化剂是通过溶胶-凝胶法和水热法制备的。这些光催化剂的特征在于X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM），傅立叶变换红外光谱（FT-IR），紫外可见漫反射光谱（UV-DRS）和氮气吸附分析用于布鲁诺尔-埃默特-泰勒（BET）比表面积测量。我们发现球形AFAC的主要成分是莫来石（Al 6 Si 2 O 13 ）和SiO 2 ; TiO 2 / small> / ZnFe 2 O 4 的微晶尺寸纳米复合材料小于10 nm，比表面积为162.18 m 2 g ？1 。 TiO 2 / ZnFe 2 O 4 纳米复合材料的带隙为2.56 eV，它将在75分钟内在可见光下光降解95％的若丹明B（RhB）。与0.02 g AFAC杂交时，TiO 2 / ZnFe 2 O 4 < /sub>/0.02 g带隙为2.50 eV的AFAC光催化剂可去除97.1％的RhB，可连续三次重复使用，光催化性能略有下降。然而，将AFAC的剂量增加至0.30g，光催化性能下降至91.0％。所有光催化剂的介孔结构和AFAC的强吸附能力是其显着性能。

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