In the present study, MIL-53(Al) metal-organic framework material dopping with iron (denoted as Fe-MIL-53(Al)) had been synthesized and applied as a catalyst to degrade rhodamine B (RB) in aqueous solution by H2O2. The obtained materials were characterized using X-ray diffraction (XRD), thermogravimetry analysis (TG), transmission electron microscopy (TEM), and energy dispersive X-ray (EDX). The influence of iron content on the structure of MIL-53(Al) and treated temperature of Fe-MIL-53(Al) were investigated. The results showed that the obtained Fe-MIL-53(Al), which was synthesized at mole ratio of Fe/Al = 1/9, had high catalytic activity for RB oxidation reaction by H2O2, RB degradation efficiency was 92%, and achieved 100% under UV radiation ([RB] = 10 mg/L). The treatment at 280 ºC had almost no effect on the structure of the material, but also slightly enhanced the catalytic activity.

In the present study, zeolitic imidazolate framework-8 (ZIF-8) is synthesized quickly in methanol solvent with the support of ultrasound, and application of photocatalyst for methylene blue (MB) decomposition reaction under UV radiation. The obtained ZIF-8 was characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and UV-Vis diffuse reflectance spectra (DR-UV-Vis). The influence pH and kinetics of photocatalytic MB decomposition and reusability of ZIF-8, were also investigated. The results indicated that ZIF-8 could work effectively in the wide pH range from 4 to 12. When the initial pH of the solution increases to 12, the adsorption capacity and MB decomposition efficiency are both high. The MB decomposition on the ZIF-8 photocatalyst followed a pseudo-first-order kinetics model. The structural strength of ZIF-8 as well as the relatively high photocatalytic efficiency after reuse three times shows that ZIF-8 has good reusability and can be applied to treatment of organic pollutants in aqueous solution.

In the present study, MIL-53(Fe) metal-organic framework material was applied as catalyst for phenol oxidation reaction in aqueous solution with H2O2 under UV radiation. The materials were characterized using X-ray diffraction (XRD), and fourier transform infrared spectroscopy (FT-IR). The effects of reaction time, initial phenol concentration, and initial pH of the solution on phenol oxidation reactions were investigated. The results indicated that MIL-53(Fe) could work effectively in the wide pH range from 2 to 10. Phenol was quickly oxidized to form simple organic acids, including acetic acid, formic acid and oxalic acid.

In this study, iron doped MIL-53(Al) metal-organic framework material (denoted as Fe/MIL-53(Al)) was prepared by hydrothermal method. The obtained materials were characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), thermogravimetry analysis (TG), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray (EDX), and N2 adsorption/ desorption isotherms. The influence of iron content on the structure of MIL-53(Al) and treated temperature of Fe/MIL-53(Al) were investigated. The results showed that the obtained Fe/MIL-53(Al) synthesized at mole ratio of Fe/Al = 1/9, still maintains many structural properties of the MIL-53 material, and the iron element was evenly distributed over the entire area of the material. The treatment at 280ºC had almost no effect on the metal-organic framework structure of the material. The pore of the material was cleared at the treated temperature of 350ºC; therefore, the specific surface area of the material increased significantly.

In the present study, manganese modified zeolitic imidazolate framework-8 (Mn-ZIF-8) and zinc-manganese bimetallic oxides (denoted as Mn@Zn), which was formed by Mn-ZIF-8 heat treatment, had been prepared and applied as photocatalysts to decompose methylene blue (MB) under UV radiation. The influence of manganese content on the structure of ZIF-8, as well as the temperature and heat treatment time of Mn-ZIF-8 material to produce Mn@Zn with high photocatalytic activity was investigated. Results showed that all Mn-ZIF-8 samples have photocatalytic activity, but the MB decomposition efficiency of Mn-ZIF-8 samples were lower than pure ZIF-8. The suitable condition for heat treatment of Mn-ZIF-8 to produce Mn@Zn with high photocatalytic activity was at 500 ºC for 5 hours. However, the MB decomposition efficiency of this sample only reached 22% after 180 minutes of UV radiation.