Preparation of the Ti3+/TiO2 supported CuO catalyst and its photocatalytic performance in the degradation of toluene
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摘要: 通过在锐钛矿TiO2载体表面上负载Cu-BTC(BTC,1,3,5-苯甲酸)前驱体,还原处理制备光催化剂CuO-Ti3+/TiO2(Cu-TiMB),对其在可见光条件下气相甲苯净化催化性能进行了研究。结果表明,该改良方法制备的CuO-Ti3+/TiO2(Cu-TiMB)催化剂的活性是浸渍法所得催化剂CuO-TiO2(Cu-TiD)的2.68倍。CuO-Ti3+/TiO2(Cu-TiMB)具有更大的比表面积(147 m2/g)和较小的颗粒粒径(0.45 μm),呈现多孔状,CuO的分散度较高;催化剂表面Ti3+提供了大量的氧缺位,在400-800 nm波段的光响应能力显著增强。CuO-Ti3+/TiO2(Cu-TiMB)催化剂中Cu2+、Cu+与Ti3+形成的异质结构进一步增多了氧缺位数量,延缓e--h+的复合时间;氧缺陷增强了捕获吸附氧能力,通过金属氧化物价态变化增强化学吸附能力,提高了光催化性能。Abstract: The CuO-Ti3+/TiO2(Cu-TiMB) pholocatalyst was prepared by reducing TiO2 loaded with Cu-BTC (BTC, 1, 3, 5-benzoic acid) precursor; its photocatalytic performance in the removal of gaseous toluene was investigated. The result indicated that the toluene removal efficiency of CuO-Ti3+/TiO2(Cu-TiMB) by visible irradiation was 2.68 time higher than that of CuO-TiO2(Cu-TiD) prepared by impregnation. The CuO-Ti3+/TiO2(Cu-TiMB) catalyst shows relatively high surface area (147 m2/g), small particle size (0.45 μm), porous structure and high CuO dispersion; Ti3+ may provide a large number of oxygen vacancies, which can significantly enhance the photocatalytic response at 400-800 nm. In addition, Cu2+ and Cu+ may form heterogeneous structure with Ti3+, which can further increase the number of oxygen vacancies and delay the electron-hole pairs (e--h+) recombination time. The oxygen vacancies are effective in enhancing the ability for capturing adsorption oxygen, promoting the chemisorption ability by changing the valence state of metal oxides, and then improving the photocatalytic performance.
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Key words:
- Ti3+/TiO2 /
- CuO /
- toluene removal /
- Cu-BTC /
- photocatalysis
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表 1 样品的比表面积、孔容、孔径及SEM平均颗粒粒径
Table 1 Specific surface area, pore volume, pore size and SEM average particle size of various catalyst samples
Sample Surface area
A/(m2·g-1)Pore volume
v/(cm3·g-1)Average pore
diameter d/nmParticle size (SEM)
d/μmTiO2 139.2 0.41 12.74 1.48 CuBTC-Ti 191.4 0.55 11.55 3.63 Cu-TiM 129.3 0.38 12.62 0.49 Cu-TiMB 147.4 0.37 9.91 0.45 Cu-TiD 109.3 0.44 16.21 1.71 表 2 Cu-TiMB反应前后元素的含量比
Table 2 Element ratio before and after reaction of Cu-TiMB
Sample Reaction Cu+/Cu2+ Oab/O Ov/O OL/O Ti3+/Ti4+ Ti2+/Ti3 Cu-TiMB before 1.23 24.7 53.01 27.09 2.78 0.12 after 1.75 10.89 62.08 23.3 3.94 0.19 -
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