2019 CSCE Annual Conference - Laval (Greater Montreal) Conference
TBBPA is a kind of widely used toxic brominated flame retardant both in market and construct materials. Biochar (black carbon), as produced from cheap agriculture wastes via pyrolysis, often play an important role to improve field fertility, soil microbe activity and prevent leaching from disposal sites. To investigate pollutant accumulation on long-term used biochar, the adsorption on aged biochar was studied concerning kinetics, adsorption rates and adsorption mechanisms. The SEM image of long-term used biochar exhibits surface aging process as the surface grows more valleys and channels. The long-term used biochar also shows higher adsorption rates and better adsorption performance than original biochar. The correlation of surface area and adsorption rate indicates that the high adsorption on long-term biochar can be attributed to high surface area. According to the peaks in FTIR spectra, the adsorption of TBBPA favors the hydroxyl interactions, and the long-term used biochar has more hydroxyl groups for the adsorption, which suggest another explanation of TBBPA accumulation on long-term used biochar. Thus, the long-term used biochar has higher capacity of TBBPA adsorption, resulting in constant accumulation process of TBBPA and related organics, which can involve a potential threat for soil poisoning and unexpected pollutions.