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.
Highlights
Dyes are widely used in a number of industries, such as printing, painting, textile, paper, leather, etc. [1]
The crystallographic structures of the as-prepared Ag/AgCl, MIL-101(Fe) and Ag/AgCl/MIL-101(Fe) sample were determined by powder X-ray diffraction patterns (XRD) (Figure 1)
All of the above peaks corresponding to Ag and AgCl can be found in the XRD pattern of Ag/AgCl
Summary
Dyes are widely used in a number of industries, such as printing, painting, textile, paper, leather, etc. [1]. Dyes are widely used in a number of industries, such as printing, painting, textile, paper, leather, etc. It is estimated that commercial dyes about 7 × 105 t are produced worldwide each year and about 5–10% of them are eventually lost in the waste water [2]. This waste water, if not properly treated, could result in considerable damage to aquatic life and human health. Most of the dyes are hardly removed from effluents by conventional biological (activated sludge) processes [3]. An efficient method of treating dye wastes is urgently required
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