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Kinetic profiles (pseudo-first-order (—), pseudo-second-order (…)) for OFL onto HNT (■ black), HNT/Fe3O4-C (● red), HNT/Fe3O4-H (▲ blue) and HNT/Fe3O4-SG (▼ green) (Experimental conditions: sorbent 20 mg, 10 mL tap water, OFL initial concentration 20 mg L−1, RSD < 10%).
