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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
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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 SO42– 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 SO32– to SO42– 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
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