期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 52, 期 15, 页码 8568-8577出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.8b00655
关键词
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资金
- National Key Research and Development Program of China [2016YFC0204100]
- Zhejiang Provincial 151 Talents Program
- Key Project of Zhejiang Provincial Science & Technology Program
- Program for Zhejiang Leading Team of ST Innovation [2013TD07]
- Changjiang Scholar Incentive Program (Ministry of Education, China)
A pseudo photocatalysis process, being initiated between plasma and N-type semiconductors in the absence of light, was investigated for NO removal for the first time via dynamic probing of reaction processes by FT-IR spectra. It was demonstrated that N-type semiconductor catalysts could be activated to produce electron-hole (e(-)-h(+)) pairs by the collision of high-energy electrons (e*) from plasma. Due to the synergy of plasma and N-type semiconductors, major changes were noted in the conversion pathways and products. NO can be directly converted to NO(2)(- )and NO3- instead of toxic NO2, owing to the formation of O-2(-) and center dot OH present in catalysts. New species like O-3 or center dot O may be generated from the interaction between catalyst-induced species and radicals in plasma at a higher SIE, leading to deep oxidation of existing NO2 to NO2O5. Experiments with added trapping agents confirmed the contribution of e(-) and h(+) from catalysts. A series of possible reactions were proposed to describe reaction pathways and the mechanism of this synergistic effect. We established a novel system and realized an e*-activated pseudo photocatalysis behavior, facilitating the deep degradation of NO. We expect that this new strategy would provide a new idea for in-depth analysis of plasma-activated catalysis phenomenon.
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