Huazhong Agricultural University has made new progress in high efficiency photocatalytic removal of air pollutants

Recently, the research group of "advanced materials and green catalysis" led by Professor Chen Hao of the school of science of Huazhong Agricultural University has made new progress in the field of environmental photocatalysis The relevant achievements are "insight into the effect of bromine on surface dependent surface oxygen cultures construction and stabilization of Bi 2 moo 6 for efficient photocatalysis No "Removal" was published in applied catalyst B: environmental (DOI: 10.1016/j.apcatb 2019.118585) The first author of this paper is Associate Professor Wang Shengyao, Associate Professor Ding Xing and master Yang Nan Associate Professor Wang Shengyao and Professor Chen Hao are co correspondents of this paper With the acceleration of global industrialization, the environmental pollution caused by the emission of nitrogen oxides (NOx, no as the main form) in the atmosphere is increasingly serious Photocatalytic technology has attracted much attention because it can effectively oxidize and remove no pollutants, has low cost and is environmentally friendly Recent studies have shown that the construction of surface oxygen vacancies in photocatalytic materials can not only broaden the absorption spectrum of the materials, inhibit the photocurrent recombination rate, but also act as the active sites of photocatalytic reaction activation molecules Especially in the photocatalytic no removal reaction, the surface oxygen vacancy can not only improve the efficiency of catalytic oxidation of no, but also regulate the production of active species and realize the complete oxidation of No However, it is still a challenge to construct a stable surface oxygen vacancy under mild conditions The interface characteristics of materials usually play an important role in the structure and stability of oxygen vacancy on the surface, especially the change of electronic structure caused by the introduction of foreign ions into different exposed crystal surfaces will promote the escape of lattice oxygen to form oxygen vacancy Inspired by this, Professor Chen Hao's research group of the Institute of science selected the Classic Bi 2MoO 6, realized the control of the exposed crystal surface by simple hydrothermal method, and reduced the formation energy of oxygen vacancy on the surface of Bi 2MoO 6 by introducing the halogen Br - with high electronegativity and the metal Bi on the surface of the material, so as to construct the oxygen vacancy on the surface of Bi 2MoO 6 under mild conditions Based on the influence of Br - on the formation energy of oxygen vacancy on the surface of Bi 2MoO 6, the influence of Br - on the formation and stability of oxygen vacancy on the surface of Bi 2MoO 6 was studied by theoretical simulation and experimental characterization In this study, it is the first time to use the soft chemistry method to realize the controllable construction and stabilization of oxygen vacancy on the surface of Bi 2MoO 6, and to study the effect of enhanced photocatalytic molecular oxygen activation on the removal of No The optimized Bi 2MoO 6 (bmo-001-br) not only has the photocatalytic no removal activity of 62.9% in the flow reaction system, but also has the complete no oxidation selectivity of 93.61%, which provides the theoretical basis and reference data for the further construction of efficient and stable photocatalytic no removal system based on the promotion of surface oxygen vacancy The research was supported by the National Natural Science Foundation of China, the natural science foundation of Hubei Province and the University Independent Innovation Fund.