摘要
４－氨基吡啶树脂（４－ＡＰＲ）对Ｃｒ（Ⅵ）的吸附在ｐＨ＝２时最佳，静态饱和吸附容量１６３．６ｍｇＣｒ（Ⅵ）／ｇ树脂，用４．５ｍｏｌ Ｌ－１ ＮａＯＨ溶液能洗脱。测得２９８Ｋ时表观吸附速率常数ｋ２９８＝６．２５×１０－４Ｓ－Ｉ．等温吸附遵循Ｆｒｅｕｎｄｌｉｃｈ曲线，吸附机理表明４－ＡＰＲ功能上的Ｎ与Ｃｒ（Ⅵ）发生配位键合，配位摩尔比为１：１。
Cr(Ⅵ) was quantitatively adsorbed with 4- amino- pyridine resin(4- APR) in a medium of pH=2.0. The statically saturated sorption capacity is 163.6mg Cr(Ⅵ) /g resin [3.15mmol Cr(Ⅵ)/g resin]. Cr(Ⅵ) adsorbed on 4-APR can be eluated with 4.5mol/L NaOH. The sorption rate constant determined at 298K was k298=6.25×10-4s-1. Coordination molar ratio of Cr(Ⅵ) to -NH N is 1:1. The sorption behavior of 4-APR for Cr(Ⅵ) obeys the Freundlich isotherm. The sorption mechanism shows that the nitrogen atoms of the functional gtoup of 4-APR coordinated with Cr(Ⅵ) to form coordination bond.
出处
《有色金属》
CSCD
2000年第3期66-69,共4页
Nonferrous Metals
基金
浙江省教委资助项目!(97211)
