In recent years,ozone has become one of the key pollutants affecting the urban air qual-ity.Direct catalytic decomposition of ozone emerges as an effective method for ozone re-moval.Field experimentswere conducted to ...In recent years,ozone has become one of the key pollutants affecting the urban air qual-ity.Direct catalytic decomposition of ozone emerges as an effective method for ozone re-moval.Field experimentswere conducted to evaluate the effectiveness of exteriorwall coat-ings with ozone decomposition catalysts for ozone removal in practical applications.ANSYS 2020R1 software was first used for simulation and analysis of ozone concentration and flow fields to investigate the decomposition boundary of these wall coatings.The results show that the exterior wall coatings with manganese-based catalysts can effectively reduce the ozone concentration near the wall coating.The ozone decomposition efficiency is nega-tively correlated with the distance fromthe coating and the decomposition boundary range is around 18 m.The decomposition boundary will increase with the increase of tempera-ture,and decrease with the increase of the wind speed and the relative humidity.These results underscore the viability of using exterior wall coatings with catalysts for controlling ozone pollution in atmospheric environments.This approach presents a promising avenue for addressing ozone pollution through self-purifying materials on building external wall.展开更多
Air pollution is a major challenge to the improvement of urban environmental quality.The control of air pollution still faces severe challenges,especially in developing countries,such as ozone pollution control.Ozone ...Air pollution is a major challenge to the improvement of urban environmental quality.The control of air pollution still faces severe challenges,especially in developing countries,such as ozone pollution control.Ozone is a typical secondary air pollutant,and its formation chemistry from its precursors(NOx and volatile organic compounds)is highly nonlinear,which caused the emission reduction of its precursors is not always effective and therefore new assisted approaches to control of ozone pollution are needed.Photocatalysis and ambient catalysis technology are expected to be applied in open atmosphere as a new booster to the direct purification of air pollutants in emission sources.In this perspective,we summarize the current knowledge about the photocatalysis and ambient catalysis technology for the removal of air pollutants under natural photothermal conditions.Based on these technologies,we propose the concept of“Environmental Catalytic City”,which refers to the spontaneous purification of low concentration urban air pollutants in the atmosphere by catalytic materials coating on the artificial surfaces,such as building surfaces in the city.In this way,the urban city with self-purification function can remove air pollution without additional energy consumption.The further improvement,development,and application of the“Environmental Catalytic City”is also discussed.展开更多
基金supported by the National Natural Science Foundation of China(Nos.52470114 and 52022104)the National Key R&D Program of China(No.2022YFC3702802)the Youth Innovation Promotion Association,CAS(No.Y2021020).
文摘In recent years,ozone has become one of the key pollutants affecting the urban air qual-ity.Direct catalytic decomposition of ozone emerges as an effective method for ozone re-moval.Field experimentswere conducted to evaluate the effectiveness of exteriorwall coat-ings with ozone decomposition catalysts for ozone removal in practical applications.ANSYS 2020R1 software was first used for simulation and analysis of ozone concentration and flow fields to investigate the decomposition boundary of these wall coatings.The results show that the exterior wall coatings with manganese-based catalysts can effectively reduce the ozone concentration near the wall coating.The ozone decomposition efficiency is nega-tively correlated with the distance fromthe coating and the decomposition boundary range is around 18 m.The decomposition boundary will increase with the increase of tempera-ture,and decrease with the increase of the wind speed and the relative humidity.These results underscore the viability of using exterior wall coatings with catalysts for controlling ozone pollution in atmospheric environments.This approach presents a promising avenue for addressing ozone pollution through self-purifying materials on building external wall.
基金the support of the National Natural Science Foundation of China(NSFC)(Nos.52425003,22188102,and 52400144)the Project funded by China Postdoctoral Science Foundation(Nos.BX20220325 and 2023M743707)the Youth Innovation Promotion Association,CAS(Nos.Y2021020 and Y2022023).
文摘Air pollution is a major challenge to the improvement of urban environmental quality.The control of air pollution still faces severe challenges,especially in developing countries,such as ozone pollution control.Ozone is a typical secondary air pollutant,and its formation chemistry from its precursors(NOx and volatile organic compounds)is highly nonlinear,which caused the emission reduction of its precursors is not always effective and therefore new assisted approaches to control of ozone pollution are needed.Photocatalysis and ambient catalysis technology are expected to be applied in open atmosphere as a new booster to the direct purification of air pollutants in emission sources.In this perspective,we summarize the current knowledge about the photocatalysis and ambient catalysis technology for the removal of air pollutants under natural photothermal conditions.Based on these technologies,we propose the concept of“Environmental Catalytic City”,which refers to the spontaneous purification of low concentration urban air pollutants in the atmosphere by catalytic materials coating on the artificial surfaces,such as building surfaces in the city.In this way,the urban city with self-purification function can remove air pollution without additional energy consumption.The further improvement,development,and application of the“Environmental Catalytic City”is also discussed.
