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MIL-101(Fe)/g-C3N4 for enhanced visible-light-driven photocatalysis toward simultaneous reduction of Cr(VI) and oxidation of bisphenol A in aqueous media
Summary:
The authors from Central South University and LUT University developed a MIL-101(Fe)/g-C3N4 heterojunction material with enhanced visible-light-driven photocatalysis, achieving significant results in the simultaneous reduction of Cr(VI) and oxidation of bisphenol A in aqueous media.
Background:
1. Water contamination by heavy metals and organic pollutants is a major environmental challenge. Previous researchers focused on the photocatalytic reduction of Cr(VI) or oxidation of organic pollutants separately, achieving some success. However, these methods are mostly limited to UV light and suffer from low solar energy conversion efficiency, high recombination rates of electron-hole pairs, and insufficient surface area.
2. The authors proposed an innovative method of synthesizing a MIL-101(Fe)/g-C3N4 heterojunction via in-situ growth, which significantly enhanced light absorption and charge carrier separation, leading to improved photocatalytic performance.
Research Content:
1. Synthesis:
The authors synthesized the MIL-101(Fe)/g-C3N4 heterojunction using an in-situ solvothermal method.
2. Characterizations:
1) BET results showed that the MIL-101(Fe)/g-C3N4 had a specific surface area of 131.6 m²/g and pore volume of 0.51 cm³/g.
2) SEM/TEM tests revealed that the MIL-101(Fe) crystals were closely anchored on the surface of g-C3N4 sheets with a size of about 1 μm.
3) UV-vis DRS indicated enhanced visible light absorption, with a bandgap of 2.26 eV for the heterojunction.
3. Application:
The MIL-101(Fe)/g-C3N4 heterojunction was tested for the simultaneous photocatalytic reduction of Cr(VI) and degradation of bisphenol A under visible light. The results showed a significant enhancement in photocatalytic performance, with a Cr(VI) reduction rate constant of 0.0432 min⁻¹ and BPA degradation efficiency of up to 96.4% under pure O₂ aeration.
4. Mechanism:
The analysis of the experiment results and ESR spectra indicated that the heterojunction formed a direct Z-scheme structure, where photogenerated electrons and holes were effectively separated and transferred to different components, facilitating the reduction of Cr(VI) and oxidation of bisphenol A.
Outlook:
This research provides a promising strategy for designing high-efficiency metal-free semiconductor/Fe-based MOFs heterojunctions with outstanding photocatalytic performance for simultaneous removal of different pollutants, contributing to environmental remediation.
MIL-101(Fe)/g-C3N4 for enhanced visible-light-driven photocatalysis toward simultaneous reduction of Cr(VI) and oxidation of bisphenol A in aqueous media
Authors: Feiping Zhao, Yongpeng Liu, Samia Ben Hammouda, Bhairavi Doshi, Néstor Guijarro, Xiaobo Min, Chong-Jian Tang, Mika Sillanpää, Kevin Sivula, Shaobin Wang
DOI: 10.1016/j.apcatb.2020.119033
Link: https://www.sciencedirect.com/science/article/pii/S0926337320304483
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