TY - JOUR ID - 10.1016/j.jes.2020.09.037 TI - Removal of elemental mercury by photocatalytic oxidation over La2O3/Bi2O3 composite AU - Renjun Li AU - Yanan Zhou AU - Xueqian Wang AU - Langlang Wang AU - Ping Ning AU - Lei Tao AU - Jun Cai VL - 33 IS - 4 PB - SP - 384 EP - 397 PY - JF - Journal of Environmental Sciences JA - J. Environ. Sci. UR - http://www.jesc.ac.cn/jesc_en/ch/reader/view_abstract.aspx?file_no=S1001074220304113&flag=1 KW - Corresponding authors.;2;Calcination temperature;0;Photocatalytic oxidation AB - La2O3/Bi2O3 photocatalysts were prepared by impregnation of Bi2O3 with an aqueous solution of lanthanum precursor followed by calcination at different temperatures. The composite materials were used for the first time for the photocatalytic removal of Hg0 from a simulated flue gas under UV light irradiation. The results showed that the sample containing 6 wt.% La2O3 and calcined at 500°C has the highest dispersion of the active sites, which was promoted by the strong interaction with the support (i.e., the formation of Bi-O-La species). Since they are fully accessible on the surface, the material also exhibits excellent optical properties while the heterojunction formed in La2O3/Bi2O3 promotes the separation and migration of photoelectron-hole pairs and thus Hg0 oxidation efficiency is enhanced. The effects of the various factors (e.g., the reaction temperature and composition of the simulated flue gas (i.e., O2, NO, H2O, and SO2)) on the efficiency of the Hg0 photocatalytic oxidation were investigated. The results demonstrated that O2 and SO2 enhanced the efficiency of the reaction while the reaction temperature, NO, and H2O had an inhibitory effect. ER -