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首页> 外文期刊>Environmental Science & Technology >Efficient SO_2 Removal and Highly Synergistic H_2O_2 Production Based on a Novel Dual-Function Photoelectrocatalytic System
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Efficient SO_2 Removal and Highly Synergistic H_2O_2 Production Based on a Novel Dual-Function Photoelectrocatalytic System

机译：基于新型双函数光电催化系统的高效SO_2去除和高度协同H_2O_2生产

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摘要

The direct conversion of SO_2 to SO_3, is rather difficult for flue gas desulfurization due to its inert dynamic with high reaction activation energy, and the absorption by wet limestone-gypsum also needs the forced oxidation of O_2 to oxidize sulfite to sulfate, which is necessary for additional aeration. Here, we propose a method to remove SO_2 with highly synergistic H_2O_2 production based on a novel dual-function photoelectrocatalytic (PEC) system in which the jointed spontaneous reaction of desulfurization and H_2O_2 production was integrated instead of nonspontaneous reaction of O_2 to H_2O_2. SO_2 was absorbed by alkali liquor then oxidized quickly into SO_4~(2-) by a nanorod α-Fe_2O_3 photoanode, which possessed high alkali corrosion resistance and electron transport properties. H_2O_2, was produced simultaneously in the cathode chamber on a gas diffusion electrode and was remarkably boosted by the conversion reaction of SO_3~(2-) to SO_4~(2-) in the anode chamber in which the released chemical energy was effectively used to increase H_2O_2. The photocurrent density increased by 40% up to 1.2 rnA-cm~(-2), and the H_2O_2 evolution rate achieved 58.8 μmoL·~(-1)·h~(-1)·cm~(-2) with the synergistic treatment of SO_2, which is about five times than that without SO_2. This proposed PEC cell system offers a cost-effective and environmental-benign approach for dual purpose of flue gas desulfurization and simultaneous high-valued H_2O_2 production.
机译：SO_2至SO_3的直接转化为烟气脱硫，由于其惰性动力量，具有高反应激活能量，并且湿石灰石 - 石膏的吸收也需要O_2的强制氧化来将亚硫酸盐氧化至硫酸盐，这是必要的额外曝气。在此，我们提出了一种基于新型双函数光电催化（PEC）系统的高度协同H_2O_2产生的方法，其中整合了脱硫和H_2O_2产生的连接自发反应而不是O_2至H_2O_2的非植物反应。 SO_2被碱液吸收，然后通过纳米棒α-Fe_2O_3光阳极迅速氧化成SO_4〜（2-），其具有高碱腐蚀性和电子传输性能。 H_2O_2在气体扩散电极上的阴极室同时产生，并且通过阳极室中的SO_3〜（2-）的转化反应显着提高，其中释放的化学能量有效地用于增加H_2O_2。光电响起的密度高达1.2 rNA-cm〜（-2），求解58.8μmol·〜（-1）·h〜（-1）·cm〜（-2），具有协同作用治疗SO_2，比没有SO_2的约五倍。这一提出的PEC电池系统提供了一种具有成本效益和环境良性的烟气脱硫和同时高值H_2O_2生产的良性方法。

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  • 来源
    《Environmental Science & Technology》 |2020年第18期|11515-11525|共11页
  • 作者

    Xiaojie Mei; Jing Bai; Shuai Chen; Mengyang Zhou; Panyu Jiang; Changhui Zhou; Fei Fang; Yan Zhang; Jinhua Li; Mingce Long; Baoxue Zhou;

  • 作者单位

    School of Environmental Science and Engineering Shanghai jiao Long University Shanghai 200240 PR China;

    School of Environmental Science and Engineering Shanghai Jiao Jong University Shanghai 200240 PR China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 PR. China;

    School of Environmental Science and Engineering Shanghai jiao Tong University Shanghai 200240 PR China;

    School of Environmental Science and Engineering Shanghai jiao Tong University Shanghai 200240 PR China;

    School of Environmental Science and Engineering Shanghai jiao Tong University Shanghai 200240 PR China;

    School of Environmental Science and Engineering Shanghai Jiao Tong University Shanghai 200240 PR China;

    School of Environmental Science and Engineering Shanghai Jiao Tong University Shanghai 200240 PR China;

    School of Environmental Science and Engineering Shanghai Jiao Tong University Shanghai 200240 PR China;

    School of Environmental Science and Engineering Shanghai Jiao Tong University Shanghai 200240 PR China;

    School of Environmental Science and Engineering Shanghai jiao Tong University Shanghai 200240 PR China;

    School of Environmental Science and at Engineering Shanghai jiao Tong University Shanghai 200240 PR China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 P.R. China Key Laboratory of Thin Film and Microjabrication Technology Ministry of Education Shanghai 200240 PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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