Adsorption behavior and mechanism of amino methylene phosphonic acid resin for Ag(I)

• Published in: Transactions of Nonferrous Metals Society of China Vol. 16; no. 3; pp. 700 - 704
• Main Authors: SHU, Zeng-Nian, XIONG, Chun-Hua, WANG, Xu
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2006; Department of Chemistry, Lishui University, Lishui 323000, China%College of Food Science, Biotechnology and Environmental Engineering, Zhejiang Gongshang University, Hangzhou 310035, China
• Subjects: adsorption; amino methylene phosphonic acid resin(APAR); mechanism; adsorption; amino methylene phosphonic acid resin(APAR); mechanism; Ag
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(06)60124-6

The sorption properties of amino methylene phosphonic resin(APAR) for Ag(I) were studied. The amino methylene phosphonic acid resin(APAR) has a good adsorption ability for Ag(I) at pH=6.0 in the HAc-NaAc medium. The statically saturated adsorption capacity is 272 mg/g resin, Ag(I) adsorbed on APAR can be eluted by 5% (NH 2) 2CS-0.5 mol/L hydrochloric acid quantitatively. The adsorption rate constants determined under various temperatures are k 15°C=3.89 × 10 −5S −1, k 25°C=5.93 × 10 −5S −1, k 35°C=7.59 × 10 −5S −1, k 45°C=9.45 × 10 −5S −1, respectively. The apparent activation energy of adsorption, E a is 22.8 kJ/mol, the enthalpy change (Δ H) of sorption is 17.4 kJ/mol. The adsorption mechanism shows that the functional group of APAR coordinates with Ag(I) to form coordination bond, the coordination molar ratio of the functional group of APAR to Ag(I) is 1:1.