Sorption kinetics of 1,3,5-trinitrobenzene to biochars produced at various temperatures

Abstract Sorption kinetics of organic compounds on biochars is important for understanding the retardation mobility and bioavailability compounds. Herein, sorption 1,3,5-trinitrobenzene prepared from 200 to 700 °C was investigated explore process. Loose partition matrix condensed were formed at relatively low moderate temperatures, respectively. However, produced high temperatures rich pore structures. Therefore, equilibrium time increased with increasing preparation temperature 350 due slower diffusion rate in more matrix, then decreased when higher than 400 because faster adsorption greater number pores. Linear positive relationship between rates 200, 250, 300, H/C ratios observed, suggesting that inhibition process caused by biochars. relationships (i.e., fast outer slow rate) 400, 450, 550, graphite defects increase could promote quantity channels sites. This study reveals underlying mechanisms large size biochars, which has potential guidance application prediction environmental risks Graphical