A new La‐Doped CuBi2O4 Catalysts for the Reduction of Nitroaromatic Compounds and Toxic Organic Dyes

Abstract The new La‐doped CuBi 2 O 4 catalysts were prepared by one‐pot hydrothermal method. The prepared catalysts were investigated by high‐resolution transmission electron microscopy (HRTEM), powder X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), Hydrogen temperature‐programmed desorption (H 2 ‐TPD), and Electrochemical impedance spectroscopy (EIS). The synthetic catalysts have been investigated for the reduction of 4‐nitrophenol and toxic organic dyes. La‐doping improve the surface electron transport and H 2 ‐adsorption ability. The La−CuBi 2 O 4 (C) catalyst has higher electron transfer efficiency and stronger H absorption ability. It was proposed that the doped La 3+ and surface hydrogen species play key roles in reduction reaction. The electron transfer can be achieved by La 3+ capture electron to be reduced La 2+ , then La 2+ return to original state. Meanwhile, the improvement of H absorption ability due to La‐doping is also benefit to reduce the 4‐NP. This study is helpful in acquiring an in‐depth insight into the catalytic role of doping.