Abstract
Phosphate ions in solution can be adsorbed using sediment. Phosphate adsorption by sediment was influenced by concentration, adsorbent dosage, and temperature. The research was carried out at pH 1 for 30 minutes. The optimum adsorption occurs at a concentration of 15 ppm with an adsorption capacity of 0.41 mg/g. The adsorbent dosage was used as 1 mg with a capacity of adsorption capacity of (0.6077 mg/g). The optimum temperature is obtained at 40oC with a capacity of adsorption (0.1250 mg/g). Adsorption isotherm follows the Langmuir and Freundlich model. The Langmuir parameters as R2 (0.7270) KL(6.1750 L/mg), qm (0.3329 mg/g). Freundlich parameters were obtained as follows: R2 (0.9741), 1/n (0.6059), and KF (0.5635 m/g (L/mg)1/n. Reaction kinetics based on pseudo-second-order kinetic with a value of R2 = 0.9717, K = 25.2554 gmol-1hour-1
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