Efficient SO2 Removal and Highly Synergistic H2O2 Production Based on a Novel Dual-Function Photoelectrocatalytic System.,Environmental Science & Technology

当前位置： X-MOL 学术 › Environ. Sci. Technol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Efficient SO2 Removal and Highly Synergistic H2O2 Production Based on a Novel Dual-Function Photoelectrocatalytic System.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-08-04 , DOI: 10.1021/acs.est.0c00886
Xiaojie Mei ₁ , Jing Bai _{1,

2} , Shuai Chen ₁ , Mengyang Zhou ₁ , Panyu Jiang ₁ , Changhui Zhou ₁ , Fei Fang ₁ , Yan Zhang ₁ , Jinhua Li ₁ , Mingce Long ₁ , Baoxue Zhou _{1,

2,

3}

Affiliation

The direct conversion of SO₂ to SO₃ 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 O₂ to oxidize sulfite to sulfate, which is necessary for additional aeration. Here, we propose a method to remove SO₂ with highly synergistic H₂O₂ production based on a novel dual-function photoelectrocatalytic (PEC) system in which the jointed spontaneous reaction of desulfurization and H₂O₂ production was integrated instead of nonspontaneous reaction of O₂ to H₂O₂. SO₂ was absorbed by alkali liquor then oxidized quickly into SO₄^2– by a nanorod α-Fe₂O₃ photoanode, which possessed high alkali corrosion resistance and electron transport properties. H₂O₂ was produced simultaneously in the cathode chamber on a gas diffusion electrode and was remarkably boosted by the conversion reaction of SO₃^2– to SO₄^2– in the anode chamber in which the released chemical energy was effectively used to increase H₂O₂. The photocurrent density increased by 40% up to 1.2 mA·cm^–2, and the H₂O₂ evolution rate achieved 58.8 μmol·L^–1·h^–1·cm^–2 with the synergistic treatment of SO₂, which is about five times than that without SO₂. This proposed PEC cell system offers a cost-effective and environmental-benign approach for dual purpose of flue gas desulfurization and simultaneous high-valued H₂O₂ production.

中文翻译：

基于新型双功能光电催化系统的高效脱硫和高协同生产过氧化氢。

对于烟气脱硫来说，SO ₂直接转化为SO ₃相当困难，因为它具有高的惰性反应活性和高的反应活化能，而且湿石灰石-石膏的吸收还需要O ₂的强迫氧化才能将亚硫酸盐氧化为硫酸盐。需要额外的曝气。在此，我们提出了一种基于新型双功能光电催化（PEC）系统的具有高协同H ₂ O ₂产生的SO ₂去除方法，在该系统中，脱硫和H ₂ O ₂产生的联合自发反应被整合，而不是非自发反应O ₂至H ₂O ₂。SO ₂被碱液然后迅速氧化成SO吸收₄^2-由纳米棒的α-Fe ₂ ö ₃光电阳极，其具有高的碱的耐腐蚀性和电子传输性质。H ₂ O ₂在气体扩散电极上的阴极室中同时生成，并通过阳极室中SO ₃^2–向SO ₄^2–的转化反应而显着提高，其中释放出的化学能有效地用于增加H ₂ O ₂。高达1.2 mA·cm ^–2时，光电流密度增加40％SO ₂协同处理，H ₂ O ₂析出速率达到58.8μmol·L ^–1 ·h ^–1 ·cm ^-2，约为无SO _2的5倍。提出的PEC电解槽系统为烟气脱硫和同时生产高价值H ₂ O _2的双重目的提供了一种经济高效且环境友好的方法。

更新日期：2020-09-15

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11