摘要
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% (NH2)2CS-0.5 mol/L hydrochloric acid quantitatively. The adsorption rate constants determined under various temperatures are k15℃=3.89×10?5 s?1, k25℃=5.93×10?5 s?1, k35℃=7.59×10?5 s?1, k45℃=9.45×10?5 s?1, respectively. The apparent activation energy of adsorption, Ea is 22.8 kJ/mol, the enthalpy change (?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.
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% （NH2）2CS-0.5 mol/L hydrochloric acid quantitatively. The adsorption rate constants determined under various temperatures are k15℃=3.89 × 10^-5 s^-1, k25℃=5.93 × 10^-5 s^-1, k35℃=7.59 × 10^-5 s^-1, k45℃=9.45 × 10^-5 s^-1, respectively. The apparent activation energy of adsorption, Ea is 22.8 kJ/mol, the enthalpy change （AH） of sorption is 17A 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.
出处
《中国有色金属学会会刊：英文版》
CSCD
2006年第3期700-704,共5页
Transactions of Nonferrous Metals Society of China
基金
Project(20040501) supported by the Department of Education of Zhejiang Province, China
关键词
APAR
银
吸附
HAc-NaAc
amino methylene phosphonic acid resin（APAR）
Ag
adsorption
mechanism amino methylene phosphonic acid resin（APAR）
