Photothermal synergistic catalytic systems for treating volatile organic compounds(VOCs)have attracted signif-icant attention due to their energy efficiency and potential to reduce carbon emissions.However,the mechani...Photothermal synergistic catalytic systems for treating volatile organic compounds(VOCs)have attracted signif-icant attention due to their energy efficiency and potential to reduce carbon emissions.However,the mechanism underlying the synergistic reaction remains a critical issue.This study introduces a photothermal synergistic system for the removal of ethyl acetate(EA)by synthesizing Cu-doped OMS-2(denoted as Cu-OMS-2).Under ultraviolet-visible(UV–Vis)irradiation in a flow system,the Cu-OMS-2 catalyst exhibited significantly enhanced performance in the EA degradation process,nearly doubling the effectiveness of pure OMS-2,and increasing carbon dioxide yield by 20%.This exceptional performance is attributed to the synergistic effect of increased oxygen vacancies(OV)at OMS-2 active sites and Cu doping,as confirmed by H2-TPR,O_(2)-TPD,and CO consump-tion measurements.This study clarifies the catalytic mechanism of light-assisted thermocatalysis and offers a novel strategy for designing photothermal catalysts with homogeneous Cu-doped nanorods for VOC removal.展开更多
夏季臭氧(O_(3))污染已经成为我国许多城市空气质量改善的主要制约因素。挥发性有机物(VOCs)是O_(3)生成的重要前体物,目前开展的VOCs研究主要采用观测或光化学校正后初始VOCs浓度。然而这些结果与O_(3)生成无关,光化学反应消耗的VOCs(...夏季臭氧(O_(3))污染已经成为我国许多城市空气质量改善的主要制约因素。挥发性有机物(VOCs)是O_(3)生成的重要前体物,目前开展的VOCs研究主要采用观测或光化学校正后初始VOCs浓度。然而这些结果与O_(3)生成无关,光化学反应消耗的VOCs(初始与观测VOCs的浓度差)才是O_(3)生成的关键。为了更好地了解光化学反应消耗VOCs的变化特征,本研究于夏季在太原市一个城市站点对环境空气中的O_(3)、VOCs浓度及气象要素进行为期一个月的综合观测,基于VOCs观测浓度(VOCs-Obs)采用光化学年龄参数化方法估算了VOCs初始浓度(VOCs-Ini),分析了光化学消耗VOCs(VOCs-con)的关键组分和驱动其生成O_(3)的气象因素,阐明了VOCs-con对O_(3)生成的影响。结果表明:日间O_(3)的变化趋势与VOCs-con大体一致,VOCs-con高值伴随高浓度O_(3)。日间VOCs初始浓度φ(Ini-N)平均值为15.3×10^(-9),φ(VOCs-con)平均值为3.1×10^(-9),光化学损耗达20.5%;其中烯烃(2.2×10^(-9))贡献最大,光化学损耗达51.2%。烯烃对OFPVOCs-con贡献最大(89.9%),乙烯是其中最主要贡献者(36.8%),异戊二烯次之(32.7%)。高温(T>28.0℃)、低相对湿度(40.0%~66.0%)、适度大气压(91.70~92.42 k Pa)和弱风(0.9~2.5 m·s^(-1))有利于促进O_(3)生成。展开更多
基金supported by the Qilu University of Technology(Shandong Academy of Sciences),the Basic Research Project of Science,Education and Industry Integration Pilot Project(No.2022PY047).
文摘Photothermal synergistic catalytic systems for treating volatile organic compounds(VOCs)have attracted signif-icant attention due to their energy efficiency and potential to reduce carbon emissions.However,the mechanism underlying the synergistic reaction remains a critical issue.This study introduces a photothermal synergistic system for the removal of ethyl acetate(EA)by synthesizing Cu-doped OMS-2(denoted as Cu-OMS-2).Under ultraviolet-visible(UV–Vis)irradiation in a flow system,the Cu-OMS-2 catalyst exhibited significantly enhanced performance in the EA degradation process,nearly doubling the effectiveness of pure OMS-2,and increasing carbon dioxide yield by 20%.This exceptional performance is attributed to the synergistic effect of increased oxygen vacancies(OV)at OMS-2 active sites and Cu doping,as confirmed by H2-TPR,O_(2)-TPD,and CO consump-tion measurements.This study clarifies the catalytic mechanism of light-assisted thermocatalysis and offers a novel strategy for designing photothermal catalysts with homogeneous Cu-doped nanorods for VOC removal.
文摘夏季臭氧(O_(3))污染已经成为我国许多城市空气质量改善的主要制约因素。挥发性有机物(VOCs)是O_(3)生成的重要前体物,目前开展的VOCs研究主要采用观测或光化学校正后初始VOCs浓度。然而这些结果与O_(3)生成无关,光化学反应消耗的VOCs(初始与观测VOCs的浓度差)才是O_(3)生成的关键。为了更好地了解光化学反应消耗VOCs的变化特征,本研究于夏季在太原市一个城市站点对环境空气中的O_(3)、VOCs浓度及气象要素进行为期一个月的综合观测,基于VOCs观测浓度(VOCs-Obs)采用光化学年龄参数化方法估算了VOCs初始浓度(VOCs-Ini),分析了光化学消耗VOCs(VOCs-con)的关键组分和驱动其生成O_(3)的气象因素,阐明了VOCs-con对O_(3)生成的影响。结果表明:日间O_(3)的变化趋势与VOCs-con大体一致,VOCs-con高值伴随高浓度O_(3)。日间VOCs初始浓度φ(Ini-N)平均值为15.3×10^(-9),φ(VOCs-con)平均值为3.1×10^(-9),光化学损耗达20.5%;其中烯烃(2.2×10^(-9))贡献最大,光化学损耗达51.2%。烯烃对OFPVOCs-con贡献最大(89.9%),乙烯是其中最主要贡献者(36.8%),异戊二烯次之(32.7%)。高温(T>28.0℃)、低相对湿度(40.0%~66.0%)、适度大气压(91.70~92.42 k Pa)和弱风(0.9~2.5 m·s^(-1))有利于促进O_(3)生成。
