Abstract
To achieve the purpose of treating waste by waste, in this study, a nitrogen-doped Fe/Mn bimetallic biochar material (FeMn@N-BC) was prepared from chicken manure for persulfate (PS) activation to degrade Bisphenol A (BPA). The FeMn@N-BC was characterized by scanning electron microscopy (SEM), X-ray diffract meter (XRD), fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectrometer (XPS) and found that N doping can form larger specific surface area, higher defective degree and more active sites on the catalyst surface so that reduce the loss of metal. Catalytic degradation experiments showed that Fe/Mn bimetal doping not only accelerated the electron cycling rate on the catalyst surface, greatly improved the catalytic effect, but also makes the biochar magnetic and easy to separate, thus reducing environmental pollution. the performance of BPA degradation was compared under different kinds of biochar materials, and it was concluded that the highest degradation efficiency of BPA was achieved when the mass ratios of urea and chicken manure, Fe/Mn were 3:1 and 2:1, respectively, and the pyrolysis temperature was 800°C, which can almost degrade all the BPA in 60 min. In addition, the effects of different PS concentration, catalyst dosage, initial pH and co-existing anions on the degradation of BPA in FeMn@N-BC/PS system were also investigated. Finally, the degradation mechanism of BPA in FeMn@N-BC/PS system was verified by radical quenching and electron paramagnetic resonance (EPR) experiments. The results showed that the degradation mechanisms of BPA in FeMn@N-BC/PS system were both radical and non-radical pathways, including SO4−•, •OH, 1O2, O2−• and electron transfer. After 4 cycles of FeMn@N-BC, the efficiency of BPA removal can still reach about 75%, showing good reuse potential. FeMn@N-BC/PS system with high catalytic efficiency and low consumables is promising for reuse of waste resources and the remediation of wastewater.