Ag/AgCl/MIL-101(Fe) Catalyzed Degradation of Methylene Blue under Visible Light Irradation

Abstract

A novel photo-Fenton catalyst named Ag/AgCl/MIL-101(Fe) was synthesized by the method of precipitation and photo reduction and characterized by X-ray diffraction patterns (XRD), Brunauer-Emmett-Teller (BET) measurements, Fourier transform infrared spectra (FTIR), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse reflectance spectra. Moreover, the catalytic activity of the synthesized catalyst was tested using methylene blue (MB) as the target pollutant. The obtained results illustrated that the plasmonic material Ag/AgCl was successfully loaded on MIL-101(Fe) and the obtained catalyst exhibited an excellent catalytic activity under visible light at the neutral pH. According to the analyses of Plackett-Burman and Box-Behnken design, the optimum conditions for MB degradation were obtained. Under these conditions, the MB decolorization and mineralization efficiencies could reach to 99.75% and 65.43%, respectively. The recycling experiments also showed that the as-prepared catalyst displayed good reusability. In addition, the possible reaction mechanisms for the heterogeneous photo-Fenton system catalyzed by Ag/AgCl/MIL-101(Fe) were derived. The synthesized catalyst provides a promising approach to degrade organic pollutants in waste water.

A Fenton-like method using ZnO doped MIL-88A for degradation of methylene blue dyes

“…It is estimated that about 5-10% of commercial dyes will ow into the environment along with the discharge of industrial wastewater. 1 The main characteristics of dye wastewater are darker color and low light transmittance, which will block sunlight penetration, thereby reducing the amount of dissolved oxygen and affecting the survival of aquatic animals and plants. 2,3 Dye wastewater oen contains highly toxic organic compounds, which have teratogenic, carcinogenic and lethal effects, and are not easily biodegraded.…”

Microwave-Assisted Synthesis of the Flexible Iron-Based MIL-88B Metal-Organic Framework for Advanced Energetic Systems

“…[53,54,56,58] Most importantly, the absorption of Fe-O bonds could be recognized around 545 cm -1 . [54,59,60] Figure 8. FTIR absorption spectrum of the activated MIL-88B(Fe).…”

Photocatalytic Performance of the MOF-Coating Layer on SPR-Excited Ag Nanowires

“…When conducting electrons, the photocatalytic performance of the system is improved by local surface plasmon resonance (SPR) of these noble metals. − Compared with the high cost of Au or Pt, silver (Ag) with high conductivity and thermal conductivity has a relatively low cost . So far, there are various Ag-modified MOFs that show good photocatalytic degradation of organic dyes. − However, the Ag used to modify MOFs in these reports is almost spherical nanoparticles, while Ag nanowires are rarely used. Unlike Ag nanoparticles that only possess a narrow SPR absorption at around 400 nm, anisotropic Ag nanowires are known to exhibit a strong and broad SPR absorption feature in the wavelength range of 330–900 nm, making them become ideal nanomaterials for enhancing the photocatalytic performance of MOFs under solar light irradiation.…”