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Influences of experimental parameters on the adsorption of DOX on GO: (a) pH effect (dosage = 0.5 g/L, temperature = 288 K, concentration = 350 mg/L); (b) dosage effect (temperature = 288 K, concentration = 500 mg/L, pH = 3.4); (c) contact time on effect (concentration: 350 mg/L; dosage: 0.5 mg/L; temperature: 288 K; pH: 3.4); (d) temperature effect (dosage: 0.5 mg/L; temperature: 288 K; pH: 3.4).
