Zelin Shan, Fang Ma, Shijie You, Chongwei Cui  

                  State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology

                                                                                                   Lianbin Shan, Deyong Kong

                                                                                     Shenyang Academy of Environmental Sciences

                                                                                                            Haijuan Guo

                                                                                          School of Environment, Liaoning University

Efficient photo-Fenton removal of antibiotic effluent is a widely followed and significant attempt to deal with the growing environmental pollution. In this study, BiFeO₃ and lanthanum doped BiFeO₃ catalysts were synthesized via one-step hydrothermal method as hydrogen peroxide activator for mineralization of norfloxacin (NOR). Various characterization measurements were used to verify La was successfully doped into the lattice of perovskite and investigated the effect of La doping molar ratio on BiFeO₃ through the characterization of the morphology and physicochemical properties. The degradation experiment and reaction rate constants showed that the La-doped BiFeO₃ particle exhibited superior photo-Fenton catalytic performance to undoped BiFeO₃. Especially, the degradation efficiency of 15% La-doped BiFeO₃ could reach up to 84.94%. And the first order kinetic constant of optimized conditions was 0.01638 min− 1, which was about 6.9 times than that of undoped BiFeO₃. The influence of pH, oxidizer content and catalyst dosage in photo-Fenton reaction were investigated detailedly. Besides, the synthetic catalyst possessed favorable stability and reusability with little metal leaching after many cycles of use. Radical scavenger experiments and electron spin resonance tests were carried out to conclude that the⋅OH and holes were regarded as the dominate active species in the catalytic process. The narrow band gap and excellent electron transfer efficiency were the key factors for La-doped BiFeO₃ to have high catalytic efficiency in the photo-Fenton system. Current works demonstrated the great promise of La-doped BiFeO₃ in the elimination of antibiotic organics.

Read the full article here:     56-Enhanced visible light photo Fenton catalysis by lanthanum doping BiFeO3 for norfloxacin degradation.pdf