Sultanov Fail, Daulbayev Chingis, Azat Seitkhan, Kuterbekov Kairat, Bekmyrza Kenzhebatyr, Bakbolat Baglan, Bigaj Magdalena, Mansurov Zulkhair
Faculty of Chemistry and Chemical Technology, al-Farabi Kazakh National University, Almaty 050000, Kazakhstan.
Laboratory of Energy-intensive and Nanomaterials, Institute of Combustion Problems, Almaty 050000, Kazakhstan.
Nanomaterials (Basel). 2020 Sep 1;10(9):1734. doi: 10.3390/nano10091734.
This paper deals with the study of the optical properties of one-dimensional SrTiO/PAN-based photocatalysts with the addition of metal oxide particles and the determination of their bandgaps. One-dimensional photocatalysts were obtained by the electrospinning method. Particles of metals such as iron, chromium, and copper were used as additives that are capable of improving the fibers' photocatalytic properties based on SrTiO/PAN. The optimal ratios of the solutions for the electrospinning of fibers based on SrTiO/PAN with the addition of metal oxide particles were determined. The transmission and reflection of composite photocatalysts with metal oxide particles were measured in a wide range of spectra, from the ultraviolet region (185 nm) to near-infrared radiation (3600 nm), to determine the values of their bandgaps. Thus, the introduction of metal oxide particles resulted in a decrease in the bandgaps of the obtained composite photocatalysts compared to the initial SrTiO/PAN (3.57 eV), with the following values: -3.11 eV for SrTiO/PAN/FeO, -2.84 eV for SrTiO/PAN/CuO, and -2.89 eV for SrTiO/PAN/CrO. The obtained composite photocatalysts were tested for the production of hydrogen by the splitting of water-methanol mixtures under UV irradiation, and the following rates of hydrogen evolution were determined: 344.67 µmol h g for SrTiO/PAN/FeO, 398.93 µmol h g for SrTiO/PAN/CrO, and 420.82 µmol h g for SrTiO/PAN/CuO.
本文研究了添加金属氧化物颗粒的一维SrTiO/PAN基光催化剂的光学性质及其带隙的测定。通过静电纺丝法制备了一维光催化剂。铁、铬和铜等金属颗粒用作添加剂，能够改善基于SrTiO/PAN的纤维的光催化性能。确定了添加金属氧化物颗粒的基于SrTiO/PAN的纤维静电纺丝溶液的最佳比例。在从紫外区域（185 nm）到近红外辐射（3600 nm）的宽光谱范围内测量了含金属氧化物颗粒的复合光催化剂的透射率和反射率，以确定其带隙值。因此，与初始的SrTiO/PAN（3.57 eV）相比，引入金属氧化物颗粒导致所得复合光催化剂的带隙减小，具体值如下：SrTiO/PAN/FeO为-3.11 eV，SrTiO/PAN/CuO为-2.84 eV，SrTiO/PAN/CrO为-2.89 eV。对所得复合光催化剂在紫外光照射下通过分解水-甲醇混合物制氢进行了测试，确定了以下析氢速率：SrTiO/PAN/FeO为344.67 µmol h g，SrTiO/PAN/CrO为398.93 µmol h g，SrTiO/PAN/CuO为420.82 µmol h g。
