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首页> 外文期刊>RSC Advances >Enhancement of hydrogen production of a Cu–TiO2 nanocomposite photocatalyst combined with broad spectrum absorption sensitizer Erythrosin B
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Enhancement of hydrogen production of a Cu–TiO2 nanocomposite photocatalyst combined with broad spectrum absorption sensitizer Erythrosin B

机译：Cu-TiO 2 纳米复合光催化剂与广谱吸收敏化剂赤藓红B的产氢增强

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A broad spectrum absorption photocatalytic system has been expected for a long time, especially for catalysts where the absorption mainly concentrates on the ultraviolet region, like TiO2. Here, dye sensitization was used to realize this expectation for TiO2. Anatase TiO2 was prepared by a hydrothermal method and then modified with Cu nanoparticles (NPs) by chemical reduction reaction. The highest H2 production rate was 3.33 mmol g?1 h?1 for Cu(3%)–TiO2 (content of Cu NPs was 3 wt%) and for pure TiO2 was only 0.356 mmol g?1 h?1. Next, the Cu(3%)–TiO2 photocatalyst was sensitized with various amounts of Erythrosin B (ErB) and the highest H2 production rate was 13.4 mmol g?1 h?1 with 3 mg of ErB in the photoreaction system. Under monochromatic light irradiation (500, 550, 600 and 650 nm), no photocatalytic activity was detected for Cu(3%)–TiO2 and some photocatalytic activities were obtained for sensitized Cu(3%)–TiO2, indicating that ErB sensitization can extend the visible light harvesting ability efficiently. Through photoelectrochemical analysis, electron–hole separation and transfer processes were promoted significantly by modification with Cu NPs and then sensitization by ErB. A possible ErB sensitization mechanism is proposed between ErB and Cu–TiO2 for the improvement of the photocatalytic activity.
机译：长期以来人们一直期望有宽光谱吸收光催化系统，特别是对于那些吸收主要集中在紫外线区域的催化剂，如TiO 2 。在这里，染料敏化被用来实现对TiO 2 的期望。通过水热法制备了锐钛矿型TiO 2 ，然后通过化学还原反应将铜纳米颗粒（NPs）改性。 H 2 的最高生产率为3.33 mmol g ？1 h ？1 < / sup> （对于Cu（3％）– TiO 2 （Cu NP的含量为3 wt％）和纯TiO 2 仅为0.356 mmol g ？1 h ？1 。接着，用各种量的赤藓红B（ErB）和最高的H 2 敏化Cu（3％）– TiO 2 光催化剂。 sub> 的生产率为13.4 mmol g，含3 mg ErB的 ？1 h ？1 在光反应系统中。在单色光（500、550、600和650 nm）照射下，未检测到Cu（3％）-TiO 2 的光催化活性，并获得了一定的光催化活性。敏化的Cu（3％）– TiO 2 ，表明ErB敏化可以有效地扩展可见光的捕获能力。通过光电化学分析，通过铜纳米粒子的修饰，然后通过ErB的敏化，显着促进了电子-空穴的分离和转移过程。提出了在ErB和Cu–TiO 2 之间提高光催化活性的可能的ErB敏化机理。

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