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| In-Situ Photochemical Reduction of Ag-UiO-66-NH2 Composite for Enhanced Photocatalytic Performance |
| Author Name | Affiliation | E-mail | | ZHOU Yun-Cai | Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China | | | WANG Chong-Chen | Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China | chongchenwang@126.com | | WANG Peng | Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China | | | FU Hui-Fen | Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China | | | ZHAO Chen | Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China | |
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| Abstract: Series of Ag-UiO-66-NH2 (X-Ag-UiO-66-NH2, X=irradiation time) composites were prepared by in-situ photochemical reduction deposition method with high power Xe lamp. The morphology and structure of X-Ag-UiO-66-NH2 were characterized by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), UV-visible diffuse-reflectance spectra (UV-Vis DRS) and X-ray photoelectron spectroscopy (XPS). The performances of X-Ag-UiO-66-NH2 toward photocatalytic Cr(Ⅵ) reduction were investigated under low power LED visible light. The reduction efficiency of Cr(Ⅵ) (initial concentration of 10 mg·L-1) over 30 min-Ag-UiO-66-NH 2 was 94% upon the irradiation low-power LED irradiation for 40 min, and Cr(Ⅵ) can be completely reduced after 60 min irradiation. The effects of different pH values (pH=2, 3, 4, 6 and 8), small organic acids (oxalic acid, citric acid and tartaric acid) and foreign ions (lake water, tap water and simulated seawater) on the photocatalytic reduction of Cr(Ⅵ) by 30 min-Ag-UiO-66-NH2 were studied. 30 min-Ag-UiO-66-NH2 can achieve 100% Cr(Ⅵ) reduction within 60 min after five running, indicating that it had good reusability and stability. The mechanism of photocatalytic Cr(Ⅵ) reduction was studied and verified by photoluminescence technology (PL), electrochemical test, electron spin resonance (ESR) and active species capture experiments. In all, the Ag nanoparticles formed by in-situ photochemical reduction deposition can improve the charge transfer at the interface of Ag-UiO-66-NH2 composite and promote the photocatalytic efficiency. |
| Keywords: composites mechanism hexavalent chromium photocatalysis in-situ |
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| ZHOU Yun-Cai,WANG Chong-Chen,WANG Peng,FU Hui-Fen,ZHAO Chen.In-Situ Photochemical Reduction of Ag-UiO-66-NH2 Composite for Enhanced Photocatalytic Performance[J].Chinese Journal of Inorganic Chemistry,2020,36(11):2100-2112. |
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