Jovanoski Kostić Aleksandra, Kanas Nikola, Rajić Vladimir, Sharma Annu, Bhattacharya Subramshu S, Armaković Stevan, Savanović Maria M, Armaković Sanja J
University of Novi Sad, Faculty of Sciences, Department of Chemistry, Biochemistry and Environmental Protection, 21000 Novi Sad, Serbia.
University of Novi Sad, Institute BioSense, 21000 Novi Sad, Serbia.
Nanomaterials (Basel). 2022 Nov 25;12(23):4193. doi: 10.3390/nano12234193.
Water pollution is a significant issue nowadays. Among the many different technologies for water purification, photocatalysis is a very promising and environment-friendly approach. In this study, the photocatalytic activity of SrLaTiO (SLTO) and SrCaNaPrTiO (SCNPTO) nano-sized powders were evaluated by degradation of pindolol in water. Pindolol is almost entirely insoluble in water due to its lipophilic properties. The synthesis of the SCNPTO was performed using the reverse co-precipitation method using nitrate precursors, whereas the SLTO was produced by spray pyrolysis (CerPoTech, Trondheim Norway). The phase purity of the synthesized powders was validated by XRD, while HR-SEM revealed particle sizes between 50 and 70 nm. The obtained SLTO and SCNPTO powders were agglomerated but had relatively similar specific surface areas of about 27.6 m g and 34.0 m g, respectively. The energy band gaps of the SCNPTO and SLTO were calculated (DFT) to be about 2.69 eV and 3.05 eV, respectively. The photocatalytic performances of the materials were examined by removing the pindolol from the polluted water under simulated solar irradiation (SSI), UV-LED irradiation, and UV irradiation. Ultra-fast liquid chromatography was used to monitor the kinetics of the pindolol degradation with diode array detection (UFLC-DAD). The SLTO removed 68%, 94%, and 100% of the pindolol after 240 min under SSI, UV-LED, and UV irradiation, respectively. A similar but slightly lower photocatalytic activity was obtained with the SCNPTO under identical conditions, resulting in 65%, 84%, and 93% degradation of the pindolol, respectively. Chemical oxygen demand measurements showed high mineralization of the investigated mixtures under UV-LED and UV irradiation.
水污染是当今一个重要问题。在众多不同的水净化技术中，光催化是一种非常有前景且环保的方法。在本研究中，通过水中吲哚洛尔的降解来评估SrLaTiO（SLTO）和SrCaNaPrTiO（SCNPTO）纳米粉末的光催化活性。吲哚洛尔因其亲脂性几乎完全不溶于水。SCNPTO采用硝酸盐前驱体的反向共沉淀法合成，而SLTO则通过喷雾热解制备（挪威特隆赫姆的CerPoTech公司）。通过XRD验证了合成粉末的相纯度，而高分辨率扫描电子显微镜显示颗粒尺寸在50至70纳米之间。所获得的SLTO和SCNPTO粉末呈团聚状，但比表面积相对相似，分别约为27.6平方米/克和34.0平方米/克。计算得出SCNPTO和SLTO的能带隙（密度泛函理论）分别约为2.69电子伏特和3.05电子伏特。在模拟太阳辐射（SSI）、紫外发光二极管（UV-LED）照射和紫外照射下，通过去除污染水中的吲哚洛尔来考察材料的光催化性能。采用超快速液相色谱结合二极管阵列检测（UFLC-DAD）来监测吲哚洛尔降解的动力学过程。在SSI、UV-LED和紫外照射下，240分钟后SLTO分别去除了68%、94%和100%的吲哚洛尔。在相同条件下，SCNPTO获得了类似但略低的光催化活性，吲哚洛尔的降解率分别为65%、84%和93%。化学需氧量测量表明，在UV-LED和紫外照射下，所研究的混合物具有较高的矿化度。
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