同济大学ACB：环糊精-嘧啶聚合物驱动的光催化H2O2生产
同济大学ACB：环糊精-嘧啶聚合物驱动的光催化H2O2生产
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图文摘要
图文导读
Fig. 1. Synthesis process and structure characterizations of CDA300 . (a) Two-step synthetic process of CDA300. (b, c) SEM images of ACD-AHMP and CDA300. (d) TEM image and (e-i) EDS element mapping results of CDA300.
2. CDA的光电特性
3、 光催化H2O2演化
Fig. 3. Photocatalytic H 2 O 2 evolution yields of the catalysts. (b) The absorption spectra and apparent quantum yields of CDA300. (c) Comparison of H 2 O 2 evolution yields of CDA300 prepared with different mass ratios of the precursors (ACD: AHMP). (d) 6 h photocatalytic H 2 O 2 production over CDA300. (e) Cycling test of H 2 O 2 evolution for four continuous cycles. (f) The photocatalytic H 2 O 2 production over CDA300 in different water media (tap water, lake water, river water, and secondary effluent).
4、 反应机理
Fig. 4. (a) Effect of different atmospheres on the H 2 O 2 generation with CDA300 (0.25 g/L catalyst). (b) The O 2 -TPD capturing ability of CDA300 and AHMP300. (c) Comparison of photocatalytic H 2 O 2 generation over CDA300 in different proportions of water/acetonitrile mixture in open air (0.25 g/L catalyst). (d) The pH evolution and corresponding H 2 O 2 yield of the CDA300 system at initial pH of 5.76. (e) Photocatalytic H 2 O 2 evolution over CDA300 in pure water at different pH in open air (0.25 g/L catalyst). (f) The pH changes at different initial pH before and after photo irradiation for 60 min.
Fig. 5. (a) Two possible binding sites of *OOH intermediate in CDA300. (b) Calculated free energy diagrams of oxygen reduction pathway towards H 2 O 2 production on different active sites in CDA300. (c) Schematic diagram of oxygen reduction to H 2 O 2 on C1 cite of CDA300.
Fig. 6. (a) Quenching experiments on photocatalytic H 2 O 2 production over CDA300 with p-BQ (1 mM), EDTA-2Na (1 mM), and TBA (1 mM). Reaction conditions: 0.25 g/L of catalysts, natural pH without adjustment, open air condition, visible light irradiation (λ ≥ 420 nm). (b) LSV curves of CDA300 measured on RDE at different rotating speeds (O 2 -saturated 0.1 M Na 2 SO 4 solution). Inset: the corresponding Koutecky-Levich plots. (c) RRDE i-t curves of CDA300 in dark and visible light at a rotating speed of 1600 rpm in Ar-saturated 0.1 M Na 2 SO 4 solution. (d) Schematic diagram of the reaction pathway of photocatalytic H 2 O 2 production with CDA300.
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