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- W2393058510 abstract "The adsorption isotherm of polyethyleneimine(PEI) modified diatomite was studied using UV spectrophotometry.The surface of diatomite was modified with polyethyleneimine by using impregnation method,and the trapping behavior of the modified diatomite for phenol was investigated by using 4-aminoantipyrine method.The experiment results showed that negatively charged diatomite particles had very strong adsorption effect for cationic macromolecules of PEI,and it was attributed to the strong electrostatic interaction.The adsorption isotherm fits the Freundlich equation.After modification,the electric properties on the surface of diatomite particles changed factually,and the isoelectric point moved from pH=2.0 to pH=10.5. In acidic solutions,phenol exists as molecules,and the modified particles adsorb phenol through hydrogen bonding interaction.However the hydrogen bonding interaction between nitrogen atoms on PEI chains and phenol is weak because of the high degree of protonation of polyethyleneimine macromolecules,so the adsorption quantity is low.In basic solutions,phenol exists as phenoxy anions,and the modified particles adsorb phenol through electrostatic interaction.However the electrostatic interaction between PEI and phenoxy anions is very weak owing to the low degree of protonation of polyethyleneimine macromolecules,so the adsorption quantity is much lower.The modified particles exhibit very strong trapping effect for phenol through the cooperation of strong electrostatic interaction with hydrogen bond effect in neutral solutions,and the saturated adsorption capacity can be as high as 92 mg/g." @default.
- W2393058510 created "2016-06-24" @default.
- W2393058510 creator A5069371386 @default.
- W2393058510 date "2006-01-01" @default.
- W2393058510 modified "2023-09-24" @default.
- W2393058510 title "STUDIES ON THE ADSORPTION BEHAVIOR OF POLYETHYLENEIMINE-MODIFIED DIATOMITE TO WARDS PHENOL" @default.
- W2393058510 hasPublicationYear "2006" @default.
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