市售绿茶自水溶液中对Au(Ⅲ)离子的吸附和解吸附  

THE ADSORPTION OF Au(Ⅲ）ION FROM AQUEOUS SOLUTION ON THE COMMERCIAL GREEN TEA

作　　者：杨中民[1] 杨春芬[1] 王光灿[1] 朱光辉[1] 

机构地区：[1]云南大学化学系,昆明650091

出　　处：《离子交换与吸附》1998年第5期440-444,共5页Ion Exchange and Adsorption

基　　金：云南省教委应用研究基金

摘　　要：研究了市售绿茶自水溶液中对Au（Ⅲ）离子的吸附和解吸附性质。测定了不同温度下的吸附速度曲线和吸附等温线。结果表明，吸附速度快，吸附率高，吸附服从Freundlich等温式，且Freundlich参数与温度有较好的相关性。以碱、酸、配合剂为解吸液，探索了吸附金在振荡、微波和超声波作用下的解吸附性质。以0．1MNaCN为解吸液，或焚烧灰化王水溶解的方法均可有效回收吸附金。The adsorption and desorption on the commercal green tea from aqueous solution containing Au(Ⅲ) ion have been studied. The adsorption isotherm can betreated with the Freundlich isotherm, and Freundlich constants are well related totemperature (t℃). The feature of peaked shape appears in Fig. 4 of adsorptionquantity-pH. The pH value of optimal adsorption is 3. 7. In the conditions of vibration, supersonic wave and microwave respectively, the desorption is very difficult by acid, base and different coordilation agents respectively. In this complexsystem, a comprehensive adsorption mechanism is suggested. The adsorbed Goldcan be retrieved efficiently by desorption with 0. 1M NaCN.

关 键 词：绿茶 金离子 吸附剂 茶叶 超声波 微波 

分 类 号：O614.123[理学—无机化学] O647.33[理学—化学]