关键词: 生物炭, 氮掺杂, 吸附, 降解

Abstract:

Biomass-derived biochar was widely used in environmental fields due to its low cost and environmental friendliness, and had a stimulative effect on achieving carbon peak and neutrality. Due to the doping of N, metal-free N-doped biochar possessed surface alkalinity and multi-adsorption sites, and the performance of pollutants removal was greatly improved. However, little attention had been paid to the green synthesis of N-doped biochar and the doping mechanism. Therefore, this paper summarized the domestic and international production of N-doped biochar and their environmental applications. The methods and N-containing functional groups were articulated. The groups included pyridinic N, pyrrolic N, and graphitic N. Their contents and types were influenced by the pyrolysis process of the N source. N doping mechanism, which was determined by the intermediates of N source decomposition, surface functional groups, and activator in the doping process, was explained. In addition, this paper discussed the environmental applications of N-doped biochar and their reaction mechanism. Based on these, we proposed the research direction of N-doped biochar to provide references for practical applications.

Key words: biochar, N-doped, adsorption, degradation