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Efficient catalytic removal of airborne ozone under ambient conditions over manganese oxides immobilized on carbon nanotubes

机译：高效的催化去除空气中的臭氧在环境条件下锰氧化物在碳纳米管固定化

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摘要

Atmospheric ozone pollution presents a new environmental challenge in developing countries such as China. As ozone is a widely used oxidant and a common by product of civil and industrial activities, it is potentially emitted during these activities and causes pollution. Ozone pollution does significant harm to both human health and the ecosystem. Therefore, it is highly desirable to develop efficient methods to eliminate airborne ozone. Catalytic decomposition has attracted extensive interest due to the fast conversion of O-3 to O-2 under ambient conditions. In this study, we fabricated manganese oxides, including MnOx nanosheets and nanoparticles, immobilized on carbon nanotubes by a facile redox method for the decomposition of ozone. The as-prepared catalysts were characterized by multiple techniques. It was found that the MnOx nanosheets consisted of amorphous MnO2 coated on the surface of carbon nanotubes (MnO2/CNTs), whereas the MnOx nanoparticles consisted of crystallized Mn3O4 immobilized on carbon nanotubes with relatively high dispersion (Mn3O4/CNTs). Both catalysts exhibited superior catalytic performance for the decomposition of ozone. Nearly 100% ozone removal efficiency was achieved at the high GHSV of 600 000 mL g(cat)(-1) h(-1) with the ozone concentration of 40 ppm. Moreover, the catalytic activities were maintained even after repeated tests under a high-humidity atmosphere. The large specific surface area and enhanced ability of electron transfer from CNTs to MnOx were responsible for the excellent catalytic performance of the catalysts towards ozone decomposition.
机译：提出了一种新的大气臭氧污染发展中国家的环境挑战中国等。和普通民用和工业产品活动,期间可能会发出这些活动,造成污染。污染对人类危害很大健康和生态系统。需要开发有效的方法消除空气中的臭氧。吸引了广泛的利益由于快环境下O-3转换成0 2条件。锰氧化物,包括MnOx nanosheets和纳米颗粒,对碳纳米管固定化一个温和的氧化还原分解的方法臭氧。特点是多种技术。发现MnOx nanosheets组成无定形汇总涂层表面的碳纳米管(汇总/碳纳米管),而MnOx纳米粒子是由结晶Mn3O4相对固定在碳纳米管上高色散(Mn3O4 /碳纳米管)。表现出优良的催化性能臭氧的分解。效率是实现高GHSV 600000毫升g h (cat)(1)(1)与臭氧40 ppm的浓度。活动是保持即使重复测试在高湿的气氛。比表面积和增强的能力从碳纳米管电子转移到MnOx负责优秀的催化对臭氧催化剂的性能分解。

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