Synthesis of N-TiO 2 @NH 2 -MIL-88(Fe) Core-shell Structure for Efficient Fenton Effect Assisted Methylene Blue Degradat
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doi: 10.1007/s40242-020-0285-x
Article
Synthesis of N-TiO2@NH2-MIL-88(Fe) Core-shell Structure for Efficient Fenton Effect Assisted Methylene Blue Degradation Under Visible Light YUAN Huiting*, REN Huizhen, LI Minning, LI Zetong, LIU Mingrui, DONG Wenjun*, WANG Ge and ZHUANG Tao Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory of Function Materials for Molecule & Structure Construction, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China Abstract Core-shell TiO2-based photocatalysts with specific composition, morphology, and functionality have attracted considerable attention for their excellent degradation properties on organic pollutants via a photocatalytic oxidation process. Herein, a N-TiO2@NH2-MIL-88(Fe) core-shell structure was prepared by coating NH 2-MIL-88(Fe) on nitrogen-doped TiO2(N-TiO2) nanoparticles. Introduction of heteroatom nitrogen to pure TiO2 expands the spectral response range, leading to enhanced quantum efficiency of photocatalyst. Furthermore, loading NH 2-MIL-88(Fe) on N-TiO2 improved the adsorption ability of the nanocomposites due to the porous tunnels of NH 2-MIL-88(Fe). The resulted core-shell N-TiO2@NH2-MIL-88(Fe) nanocomposites realized the transfer of photo excited electrons from N-TiO2 to NH2-MIL-88(Fe) rapidly, partially reduced Fe 3+ to Fe2+ in NH2-MIL-88(Fe), and further enhanced the Fenton effect on efficiently degrading methylene blue dye(MB) under visible light(λ≥420 nm) with the assistance of H2O2. Keywords NH2-MIL-88(Fe); N-TiO2; Photocatalysis; Fenton effect
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Introduction
Photocatalytic pollutant degradation by using solar energy has attracted increasing attention, which is a potential strategy to tackle environmental contamination. In the past few decades, people have been working on designing efficient photocatalysts to degrade pollutants using visible light and a vast variety of semiconductors have been developed, such as metal oxides, (oxy)nitrides and even metal-organic framework materials (MOFs). TiO2, as a typical n-type semiconductor, has various advantages like superior activity, non-toxicity, exceptional stability, etc.[1]. However, the drawbacks with the large forbidden band width[2] and the high recombination rate[3] of photo generated electron-hole of TiO2 limit its large-scale applications. To achieve a highly catalytic activity, various strategies are made to modify the catalyst, including tunning the band gap of photocatalysts by chemical-doping and constructing heterojunction through loading co-catalysts onto photocatalyst surface. For example, doping non-metal, such as fluorine[4], nitro[5] gen , boron[6], and phosphorus[7] in TiO2 had been widely studied to reduce the band gap energy, expanding the excitation
wavelength from ultraviolet to visible light region. Meanwhile it induced the generation of trivalent titanium, and enhanced the electron density around Ti, which reduced the recombination rate of photo generated electron-holes. In th
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