4.

Adsorption kinetics of atrazine (ATZ) and fipronil (FIP) by hydrochar. The tests were carried out using a pesticide concentration of 100 μg L–1, a pH of 10, a hydrochar mass of 20 mg, agitation at 40 rpm, and varying contact times (0.5 to 96 h for ATZ and 0.083 to 48 h for FIP).