Synthesis of {111} Facet-Exposed MgO with Surface Oxygen Vacancies for Reactive Oxygen Species Generation in the Dark.
Seeking a simple and moderate route to generate reactive oxygen species (ROS) for antibiosis is of great interest and challenge. This work demonstrates that molecule transition and electron rearrangement processes can directly occur only through chemisorption interaction between the adsorbed O2and high-energy {111} facet-exposed MgO with abundant surface oxygen vacancies (SOVs), hence producing singlet oxygen and superoxide anion radicals without light irradiation. These ROS were confirmed by electron paramagnetic resonance, in situ Raman, and scavenger experiments. Furthermore, heat plays a crucial role for the electron transfer process to accelerate the formation of ·O2-, which is verified by temperature kinetic experiments of nitro blue tetrazolium reduction in the dark. Therefore, the presence of oxygen vacancy can be considered as an intensification of the activation process. The designed MgO is acquired in one step via constructing a reduction atmosphere during the combustion reaction process, which has an ability similar to that of noble metal Pd to activate molecular oxygen and can be used as an effective bacteriocide in the dark.
College of Science, Hebei University of Science and Technology , Shijiazhuang 050018, China.
Ying-Juan
YJ
Hao
School of Chemical and Material Engineering, Jiangnan University , Wuxi 214122, China.
Bing
B
Liu
College of Science, Hebei University of Science and Technology , Shijiazhuang 050018, China.
Li-Gang
LG
Tian
College of Science, Hebei University of Science and Technology , Shijiazhuang 050018, China.
Fa-Tang
http://orcid.org/0000-0002-8777-090X
FT
Li
College of Science, Hebei University of Science and Technology , Shijiazhuang 050018, China.
Jie
J
Ren
College of Science, Hebei University of Science and Technology , Shijiazhuang 050018, China.
Shao-Jia
SJ
Liu
College of Science, Hebei University of Science and Technology , Shijiazhuang 050018, China.
Ying
Y
Liu
College of Science, Hebei University of Science and Technology , Shijiazhuang 050018, China.
Jun
J
Zhao
College of Science, Hebei University of Science and Technology , Shijiazhuang 050018, China.
Xiao-Jing
XJ
Wang
MgO; bacteriocide; chemisorption; reactive oxygen species; surface oxygen vacancy