氮掺杂石墨烯负载锰催化分解高湿臭氧性能

Manganese Supported Nitrogen-Doped Graphene and Performance of Catalytic Decomposition High-Humidity Ozone

以三聚氰胺为氮源,通过热退火氧化石墨烯(GO)合成氮掺杂石墨烯(NG),使用浸渍沉淀法制备NG负载锰(Mn/NG)。在相对湿度(RH)为80%,臭氧初始浓度为85.7 mg·m^(-3)条件下,反应24 h后,臭氧的分解率依旧保持在80%以上。在低RH环境下,其催化活性又能恢复到初始状态。氮掺杂不但为催化剂制造了结构缺陷,同时氮原子的孤对电子增大了氧空位电子密度,降低了水分子的吸附能,提高了催化剂的抗湿性能。

Nitrogen⁃doped graphene(NG)was synthesized by thermal annealing of graphene oxide(GO)using melamine as the nitrogen source,and NG⁃loaded manganese(Mn/NG)was prepared using the immersion precipita⁃tion method.At 80%relative humidity(RH)and an initial ozone concentration of 85.7 mg·m^(-3),the decomposition rate of ozone remained above 80%after 24 h of reaction.Under the low RH environment,the catalytic activity can be restored to the initial state again.The nitrogen doping not only created structural defects for the catalyst,but also the lone pair electrons of nitrogen atoms increased the electron density of oxygen vacancies,reduced the adsorption energy of water molecules,and improved the moisture resistance of the catalyst.