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(a) Atrazine (ATZ) e Fipronil (FIP) adsorption by hydrochar at different pH values (4, 7, and 10). The tests were carried out using a pesticide concentration of 100 μg L–1, hydrochar mass of 20 mg, agitation of 40 rpm, and contact time of 5 h. (b) Zeta potential measurements of ATZ, FIP, and hydrochar.
