Abstract
Various kinetic models and isotherm have been used for deciphering mechanism of phosphorus (P) sorption on surface sediments of polluted freshwater bodies. The P sorption kinetics and equilibrium isotherm and the relationship between phosphorus sorption parameters were studied in 24 industrially contaminated surface sediments of Govind Ballabh Pant Sagar (GBPS) reservoir, India. The results showed that P adsorption on the sediments mainly occurred within 10 h and then reached equilibrium in 48 h; phosphate sorption rates of 0–0.25 h were the highest over 48 h and suggested quick sorption process; and the pseudo-second-order rate model showed the kinetics of P adsorption with high correlation coefficients. Native adsorbed phosphorus (WNAP) and adsorption equilibrium concentration (CEPC) were found to be high in surface sediments of the most polluted upstream region. The surface sediments showed maximum adsorption (Qmax, mg kg−1) with 0.80 mg L−1 phosphorus concentration. The equilibrium concentration of phosphorus (Ceq) was more than the CEPC, while the WNAP values were less than Qmax. The positive regression between WNAP and CEPC and Kp (partition coefficient) and Qmax indicated that surface sediments would act as a sink and adsorb phosphorus from overlying water in the GBPS reservoir.
Published Version
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