Adsorption Properties of Lanthanum Modified Banana Straw to Phosphorus in Water
Lanthanum modified banana straw(LaBS)was synthesized by impregnation method with lanthanum chloride as a modifier.Phosphorus adsorption of prepared LaBS was studied.The effects of initial solution concentration,temperature,pH value and co-existing anions on the phosphorus adsorption by LaBS were investigated through batch adsorption experiments.The physicochemical properties and adsorption mechanism of LaBS were investigated by scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),specific surface area(BET),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS).The results showed that LaBS can reach the adsorption equilibrium in 360 min.The adsorption process conforms to the quasi-second-order kinetic model,and the adsorption process is controlled by multiple steps.The maximum adsorption capacity was 125 mg/g.The isothermal adsorption curves are consistent with Langmuir curves,which are monolayer adsorption.The adsorption mechanism is mainly chemisorption.The adsorption thermodynamic parameter ΔG<0 is a spontaneous process.The microscopic analysis showed that the adsorption mechanism of LaBS was mainly the exchange reaction between hydrogen bond and hydroxyl groups on its surface and phosphoric acid group in the solution.
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