Department of Chemical Engineering, Ilam University, Ilam, 69315-516, Iran.
Department of Chemistry, Payame Noor University (PNU), Tehran, 19395-3697, Iran.
Environ Sci Pollut Res Int. 2021 May;28(20):25552-25565. doi: 10.1007/s11356-020-12098-9. Epub 2021 Jan 18.
In this study, the performance of TiO, ZnO, UiO-66-NH and UiO-66-NH/TiO nanoparticles was investigated. They apply as photocatalysts for the destruction of organic reactive red dye 120 (RR120) under UV light. In order to determine the optimal conditions, effects of different catalysts and initial dye concentration, HO content and catalyst loading parameters were examined. Taguchi-designed experimental method was used to obtain optimal test conditions. The physical and chemical properties of synthetic photocatalysts were investigated by SEM, XRD, EDX, BET and DRS. SEM images show that the globular particles of titania are well placed on the surface of the metal-organic framework (MOF). XRD and EDX analyses also confirmed the presence of titania in the synthesised UiO-66-NH/TiO photocatalyst. Optimal values of HO, pH, the amount of catalyst, the dye concentration and the type of available photocatalyst to remove the RR120 dye, were obtained by 80 μl/l, 3 mg/l, 5 mg/l and 20 mg/l, UiO-66-NH/TiO catalyst, respectively. The required time for complete removal of RR120 dye under detection limit of 0.136 mg/l in optimal conditions was 10 min. The RR120 photocatalytic degradation followed the first-order kinetic equation according to the Langmuir-Hinshelwood model (k = 0.407 min). The result of optimisation showed the 20 wt% of the titania on MOF (UiO-66-NH) photocatalyst can be used in advanced oxidation processes, and it can be used as a suitable option for cleaning coloured effluent.
在这项研究中，研究了 TiO2、ZnO、UiO-66-NH 和 UiO-66-NH/TiO 纳米粒子的性能。它们被用作光催化剂，在紫外光下破坏有机活性红染料 120（RR120）。为了确定最佳条件，考察了不同催化剂、初始染料浓度、HO 含量和催化剂负载参数的影响。采用 Taguchi 设计实验方法获得最佳试验条件。采用 SEM、XRD、EDX、BET 和 DRS 研究了合成光催化剂的物理化学性质。SEM 图像表明，球形 TiO2 颗粒很好地放置在金属有机骨架（MOF）表面上。XRD 和 EDX 分析也证实了合成的 UiO-66-NH/TiO 光催化剂中 TiO2 的存在。通过 80 μl/l、3 mg/l、5 mg/l 和 20 mg/l 获得了 HO、pH、催化剂用量、染料浓度和去除 RR120 染料的可用光催化剂的最佳值，分别为 UiO-66-NH/TiO 催化剂。在最佳条件下，检测限为 0.136 mg/l 时，完全去除 RR120 染料所需的时间为 10 min。RR120 光催化降解符合 Langmuir-Hinshelwood 模型（k = 0.407 min）的一级动力学方程。优化结果表明，MOF（UiO-66-NH）上 20wt%的 TiO2 光催化剂可用于高级氧化工艺，可作为处理有色废水的合适选择。
