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

• 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
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(08)60219-8

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 HCl quantificationally. The adsorption rate constants determined under the temperatures of 288, 298, 308 and 318 K are 2.46 X 10-5, 3.82 X 10-5, 4.46 X 10-5 and 5.71 X 10-5 s-1, respectively. The apparent activation energy, Ea, is 18.1 kJ/mol and the thermodynamic parameters of adsorption, DeltaH=20.9 kJ/mol, DeltaS=161 J/(mol*K) and DeltaG298 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.