Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, P.O. Box 47, 11158, Belgrade 118, Serbia.
Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11080, Belgrade, Serbia.
Environ Sci Pollut Res Int. 2023 Jul;30(35):84046-84060. doi: 10.1007/s11356-023-28397-w. Epub 2023 Jun 24.
Photocatalytic degradation of bisphenol A (BPA) was investigated using commercial TiO P25 nanoparticles supported on natural zeolite clinoptilolite (Cli). Employing ultrasound assisted solid-state dispersion method hybrid photocatalyst containing 20 wt% of TiO, marked TCli-20, was prepared. The structural, morphological and surface properties, and particle size distribution of TCli-20 were studied by X-ray powder diffraction, Fourier transform infrared spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy, scanning electron microscopy with energy dispersive spectroscopy, atomic force microscopy, Brunner-Emmet-Teller method and laser diffraction. The results revealed a successful loading of TiO P25 nanoparticles on Cli surface and the preservation of both zeolitic structure and optical properties of TiO. The influence of catalyst dose, pH value and the addition of hydrogen peroxide (HO) was evaluated. The optimal reaction conditions were 2 g/L of catalyst at near-neutral conditions (pH = 6.4) for complete BPA (5 mg/L) photodegradation after 180 min of exposure to simulated solar light. The addition of HO was beneficial for the degradation process and led to the removal of BPA after 120 min of irradiation. BPA removal (60% for 180 min of irradiation) was reduced when TCli-20 was tested in bottled drinking water due to the presence of bicarbonate ions which acted as scavengers for hydroxyl radicals. Even though the photocatalytic activity of TCli-20 decreased after several cycles of usage, 70% of BPA was still successfully degraded during the fourth cycle. The reusability study showed easy separation, stability and good photocatalytic ability of investigated cost-effective hybrid photocatalyst.
采用超声辅助固相配位法制备了负载 20wt%TiO_2 的天然沸石丝光沸石负载型 TiO_2（TCli-20）光催化剂。采用 X 射线粉末衍射、傅里叶变换红外光谱、紫外-可见漫反射光谱、扫描电子显微镜与能谱、原子力显微镜、Brunauer-Emmett-Teller 法和激光衍射对 TCli-20 的结构、形貌和表面性质以及粒径分布进行了研究。结果表明，TiO_2 纳米颗粒成功负载在丝光沸石表面，且保留了沸石的结构和 TiO_2 的光学性能。考察了催化剂用量、pH 值和添加过氧化氢（HO）对光催化降解双酚 A（BPA）的影响。在模拟太阳光照射 180min 后，当催化剂用量为 2g/L、pH 值接近中性（pH=6.4）时，可实现 5mg/L 的 BPA 完全光降解，为最佳反应条件。HO 的添加有利于降解过程，在光照 120min 后即可去除 BPA。然而，当 TCli-20 在瓶装饮用水中进行测试时，由于存在碳酸氢根离子作为羟基自由基的清除剂，BPA 的去除率（照射 180min 后为 60%）降低。尽管 TCli-20 在多次使用后光催化活性有所下降，但在第四次循环中仍能成功降解 70%的 BPA。重复使用研究表明，所研究的具有成本效益的复合光催化剂易于分离、稳定且具有良好的光催化性能。
