Enhanced Photocatalytic Degradation of MB Under Visible Light Using the Modified MIL-53(Fe)
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ORIGINAL PAPER
Enhanced Photocatalytic Degradation of MB Under Visible Light Using the Modified MIL‑53(Fe) Tran Thuong Quang1 · Nguyen Xuan Truong1 · Tran Hong Minh1 · Nguyen Ngoc Tue1 · Giang Thi Phuong Ly1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this report, we focus on the modification of iron terephthalate metal–organic framework (MIL-53(Fe)) by soaking in H2O2 solution and its mechanism. The structure of MIL-53(Fe) before and after the modification were characterized by Fouriertransform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), and N2 adsorption–desorption isotherms. The XRD results showed that the material structure changed to amorphous phases and the photocatalytic efficiency was improved after modified by H2O2. The MIL-53 (Fe, H2O2) nanoparticles about 100–300 nm in size was successfully prepared and confirmed by SEM images. In term of UV–Vis DRS results, the absorption spectrum of modified MIL-53(Fe) shifted to higher wavelength and its band gap energy is estimated about 2.2 eV, which is significantly lower than the bandgap value of the conventional material. The impact of the modification on the photocatalytic efficiency was investigated by methylene blue (MB) degradation experiments and photoluminescence (PL) spectroscopy. MB was completely decomposed within 30 min by modified MIL-53(Fe) under optimal conditions. The reaction parameters that affect MB degradation by the as-prepared catalyst were also investigated, including the pH solution, catalyst and H2O2 dosage. Keywords MIL-53(Fe) · Photocatalyst · Fenton oxidation · MB degradation
1 Introduction Advanced oxidation processes (AOPs) are alternative techniques for environmental redemption in which contaminants are breakdown by a powerful oxidizing species such as hydroxyl radicals (·OH), superoxide radical (O2.−), etc. Heterogeneous photocatalyst-assisted AOPs have emerged as a potential solution for water, air, and wastewater treatment and energy generation. Among the hazardous substances that contaminate water, synthetic dyes are the most difficult to remove due to their complex aromatic structure, which makes them resistant to oxidation, biodegradation, temperature and light irradiation [1]. On top of that, some dyes possess toxicity, multagenic, and/or carcinogenic effects, which damages the health of human being and other living creatures [1, 2]. Metal organic framework (MOFs) are composed of metal ions/clusters and multifunctional organic bridging * Tran Thuong Quang [email protected] 1
School of Chemical Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam
ligands have received much attention recently. Crystalline metal–organic frameworks (cMOFs) have widespread applications owing to their superb features including low densities, high surface areas, tunable pore size, and high porosities. Along with the rapid development of cMOFs, amorphous MOFs (aMOFs), which maintain the basic building blocks but without long-range crystallinity, have
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