NaOH/KOH改性柠檬渣吸附Pb2+的动力学和热力学研究

doi:10.3969/j.issn.0253-2417.2017.03.020

Abstract

Abstract: In order to study the adsorption properties of chemically treated lemon residues, the lemon residues were modified by 10% KOH and 10% NaOH, respectively. The effects of the initial pH, adsorption time and initial concentration on the adsorption of Pb²⁺ were investigated, and the adsorption kinetics and thermodynamics were also studied. The samples were characterized by means of UV, XRD and EDS. The results showed that the adsorption equilibrium times of KOH and NaOH modified lemon residue to Pb²⁺ were 60 and 90 min, respectively. The adsorption of Pb²⁺ onto KOH modified lemon residue fitted to the quasi second order kinetic equation, whereas the adsorption by NaOH modified lemon residue more fitted to quasi first order kinetic equation. The adsorption of Pb²⁺ on modified lemon residue was in accordance with the Langmuir adsorption model.The maximum UV absorption wavelengths of KOH and NaOH modified lemon residues were 280 and 191 nm respectively. The structures of the lemon residues were amorphous and mainly composed of carbon. And there was Pb element in the absorbed modified lemon residues, but the formation peak of EDS was not high.

Key words: lemon residues, adsorption, modification, kinetics, thermodynamics

CLC Number:

TQ91

SHEN Wangqing, LEI Yang. Kinetics and Thermodynamics Studies of the Adsorption of Pb²⁺ onto NaOH/KOH Modified Lemon Residues[J]. Chemistry and Industry of Forest Products, 2017, 37(3): 141-146.

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Kinetics and Thermodynamics Studies of the Adsorption of Pb²⁺ onto NaOH/KOH Modified Lemon Residues

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Kinetics and Thermodynamics Studies of the Adsorption of Pb2+ onto NaOH/KOH Modified Lemon Residues

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Kinetics and Thermodynamics Studies of the Adsorption of Pb²⁺ onto NaOH/KOH Modified Lemon Residues