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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 0.5mol·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 k_ 298=2.6×10 -5 s -1. The adsorption behavior of PAR for Ni(Ⅱ) obeys the Freundlich isotherm. The thermodynamic adsorption parameters, enthalpy change △H, free energy change △G and entropy change △S of PAR for Ni(Ⅱ) are 3.36kJ·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.
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) The adsorbed on PAR can be eluted by 0.5 mol·L -1 HCl and the elution percentage reached 96.6%. The resin can be regenerated and reused without obvious decrease in adsorption capacity. The apparent adsorption rate constant is k_ 298 = 2.6 × 10 -5 s -1. The adsorption behavior of PAR for Ni (Ⅱ) obeys the Freundlich isotherm. The thermodynamic adsorption parameters, enthalpy change △ H, free energy change △ G and entropy change △ S of PAR for Ni Ⅱ) are 3.36kJ · mol -1, -5.47kJ · 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 an d IR spectrometry.