Adsorption behavior of gel-type weak acid resin (110-H) for Pb2

TG1; The adsorption properties of a novel gel-type weak acid resin (110-H) for Pb2+ were investigated using chemical methods and IR spectrometry. The optimal adsorption condition of 110-H for Pb2+ is at pH=6.49 in Hac-NaAc medium and the statically saturated adsorption capacity is 485 mg/g at 298 K....

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Published in:Transactions of Nonferrous Metals Society of China 2008-10, Vol.18 (5), p.1290-1294
Main Authors: XIONG, Chun-hua, YAO, Cai-ping
Format: Article
Language:English
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Summary:TG1; The adsorption properties of a novel gel-type weak acid resin (110-H) for Pb2+ were investigated using chemical methods and IR spectrometry. The optimal adsorption condition of 110-H for Pb2+ is at pH=6.49 in Hac-NaAc medium and the statically saturated adsorption capacity is 485 mg/g at 298 K. Pb2+ adsorbed on 110-H resin can be eluted with 0.025 mol/L HCI quantificationally. The adsorption rate constants determined under the temperatures of 288, 298, 308 and 318 K are 2.46 × 10-5, 3.82×10-5, 4.46×10-5 and 5.71×10-5 s-1, respectively. The apparent activation energy, Ea, is 18.1 kJ/mol and the thermodynamic parameters of adsorption, △H=20.9 kJ/mol,△S=161 J/(mol.K) and AG298 K =-48.0 kJ/mol, respectively. The adsorption behavior of 110-H resin for Pb2+ accords with the Langmuir isotherm. Infrared spectra show that the oxygen atoms of the functional group of resin coordinate with Pb2+ to form the coordination bands.
ISSN:1003-6326
DOI:10.1016/S1003-6326(08)60219-8