Adsorption of macroporous phosphonic acid resin for nickel

Abstract

The adsorption behavior and mechanism of a novel chelate resin, macroporous phosphonic acid resin (PAR) for Ni(II) were investigated. The statically saturated adsorption capacity is 64.3 mg·g⁻¹ resin at 298 K in HAc-NaAc medium. The Ni(II) adsorbed on PAR can be eluted by 0.5 mol·L⁻¹ HCl and the elution percentage reaches 96.6%. The resin can be regenerated and reused without obvious decrease in adsorption capacity. The apparent adsorption rate constant is k₂₉₈=2.6×10⁻⁵ s⁻¹. The adsorption behavior of PAR for Ni (II) obeys the Freundlich isotherm. The thermodynamic adsorption, parameters, enthalpy change ΔH, free energy change ΔG and entropy change ΔS of PAR for Ni(II) are 3.36 kJ·mol⁻¹, −5.47 kJ·mol⁻¹ and 29.6J·mol⁻¹·K⁻¹, respectively. The apparent activation energy is E_a=12.2kJ·mol⁻¹. The molar coordination ratio of the functional group of PAR to Ni(II) is about 4∶1. The adsorption mechanism of PAR for Ni(II) was examined by a chemical method and IR spectrometry.

Keywords

macroporous phosphonic acid resin / nickel / adsorption / mechanism

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