关键词: 改性牛骨粉, 生物炭, 过硫酸盐, 活化, 降解性能

Abstract: The activation of persulfate by carbon-based catalyst has the characteristics of high efficiency, controllable and selective activation, and so on. However, most of the existing carbon-based materials (mainly carbon nanotubes, graphene and diamond) have harsh preparation conditions, complex processes, difficulty in large-scale production, high environmental application costs and performances need to be further improved. Biochar has attracted much attention in the field of environmental catalysis because of its simple preparation, low cost, adjustable specific surface area and large number of surface functional groups. N-doped bovine bone meal biochar (BBC-N0.005) was prepared by high temperature calcination using bovine bone meal and sodium ethanesulfate as raw materials. Bovine bone meal was made from fresh animal bone, which contained collagen, high carbon content, rich phosphorus content, and provided sufficient carbon source and natural doping element for improving catalytic performance. The physicochemical properties of BBC-N0.005 were analyzed by various characterization methods, and it was used to activate peroxymonosulfate (PMS) to degrade phenol. Meanwhile, the effects of different factors on the degradation of phenol and its degradation mechanism were investigated. The results showed that when N-doping mass ratio was only 0.005, BBC-N0.005/PMS could effectively remove phenol within 30 minutes. The degradation rate of the system could reach more than 80% in the pH range of 3 to 11, which had a good pH application range. The main active species in BBC-N0.005/PMS system were SO4?-,?OH and 1O2, and the pyridine nitrogen and graphite nitrogen on the surface of BBC-N0.005 were the main active sites for activating PMS.

Key words: modified beef bone powder, biochar, persulfate, activation, degradation performance