Behavior of Adsorption of Bisphenol A on Sediments of Yellow River's Lanzhou Section
For the purpose of researching the adsorption behavior of environmental hormones typically contained in the sedi-ments of the upper-reach of the Yellow River,the sediments of Lanzhou section of the Yellow River were selected as a re-search object with BPA(bisphenol A)as the representative environmental hormone.The adsorption kinetics and adsorption isotherm process of BPA in the River's sediments,as well as the effects of sediment particle size and pH value on the adsorp-tion process,were studied by the batch equilibrium test.Consequently,it was showed that the quasi-second-order kinetic model could better fit the adsorption kinetic process of BPA in the sediments of the Yellow River(R2=0.999),the adsorption process being gradually in three stages:fast adsorption,slow adsorption and adsorption equilibrium,and it took 10 hours all so to reach adsorption equilibrium;and the Freundlich isotherm adsorption model fit the adsorption isotherm process of BPA on the sediments the best(R2≥0.986).Within the temperature range of 25～45 ℃,both of Gibbs free energy ΔGθ and enthalpy change ΔHθ were＜0,entropy change ΔSθ being＞0,which indicated that the adsorption of BPA onto the River's sediments was a spontaneous exothermic process,and the disorder degree of the adsorption process system intensified;the smaller sedi-ments particle size,the stronger the adsorption of BPA on the sediments;and as to the effects of pH value on the adsorption,it was showed that acidity boosted the adsorption,while alkality inhibited it.
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