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首页> 外文期刊>RSC Advances >Sustainable hydrogen production from electroplating wastewater over a solar light responsive photocatalyst
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Sustainable hydrogen production from electroplating wastewater over a solar light responsive photocatalyst

机译：可持续氢气在太阳灯响应光催化剂上通过电镀废水产生

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摘要

An environmentally friendly and sustainable photocatalytic hydrogen production system was successfully developed using ethylenediaminetetraacetic acid (EDTA) found in the wastewater from electroplating plants as the photo-excited hole scavenger and a solar light responsive multi-junction material as the photocatalyst. Additionally, a facile method of metal removal was established to increase the photocatalytic hydrogen production efficiency. The influences of the metal concentration, pH of the electroplating wastewater, and the photocatalyst concentration on the efficacy of hydrogen production were studied in detail. The results show that before metal removal, the unchelated metal ions and/or the metal-EDTA chelates block the active sites of the photocatalyst, resulting in suppressed adsorptions of H+ ions and/or H2O, which results in negligible hydrogen production efficiency. Through the metal removal process developed in this study, most of the metals could be removed and most of the EDTA could be retained. The removal efficiencies of copper, nickel, and zinc ions were all higher than 90%, facilitating better reaction between the liberated EDTA molecules and the photo-excited holes, improved charge separation, and enhanced hydrogen production efficiency. The system showed economically optimal hydrogen production when the reaction pH was maintained at pH = 6 and the photocatalyst concentration was maintained at 2 g L-1 under simulated sunlight irradiation.
机译：使用乙二胺四乙酸（EDTA）成功开发了环保和可持续的光催化氢气生产系统，该乙烯二氨基乙酸（EDTA）从电镀厂作为光催化的孔清除剂和太阳光响应多结材料作为光催化剂。另外，建立了一种容易的金属去除方法以增加光催化氢气产生效率。详细研究了金属浓度，电镀废水的pH和光催化剂浓度对氢气产生的功效的影响。结果表明，在金属去除之前，未掩蔽的金属离子和/或金属-EDTA螯合物阻断光催化剂的活性位点，导致H +离子和/或H2O的抑制剂，这导致氢生产效率可忽略不计。通过在本研究中开发的金属去除过程，可以去除大部分金属，并且可以保留大部分EDTA。铜，镍和锌离子的去除效率均高于90％，促进释放的EDTA分子与光激发孔之间的更好反应，提高电荷分离，提高氢气生产效率。当将反应pH保持在pH = 6时，该系统显示经济上最佳的氢气产生，并且在模拟阳光照射下将光催化剂浓度保持在2g L-1。

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  • 来源
    《RSC Advances》 |2016年第75期|共9页
  • 作者

    Su En-Chin; Huang Bing-Shun; Wey Ming-Yen;

  • 作者单位

    Natl Chung Hsing Univ Dept Environm Engn Taichung 402 Taiwan;

    Taiwan Res Inst Taipei 251 Taiwan;

    Natl Chung Hsing Univ Dept Environm Engn Taichung 402 Taiwan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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