摘要
在ｐＨ＝５．０的ＨＡｃ－ＮａＡｃ体系中，４－氨基－三氯唑树脂（４－ＡＴＲ）对Ｍｏ（Ⅵ）有较好的吸附性。静态饱和吸附容量Ａｓ＝１８９．５ｍｇ／ｇ·Ｒ，用 １～３ｍｏｌＬ^（－１）ＨＣｌ可以将吸附的Ｍｏ定量洗脱。 ２９８Ｋ测得吸附热力学参数△Ｈ＝－２７．３ｋＪ·ｍｏｌ^（－１），△Ｇ^（２９８）＝－３４．１ｋＪ·ｍｏｌ^（－１）△Ｓ^（２９８）＝２２．８Ｊ·ｍｏｌ^（－１）·Ｋ^（－１）。吸附机理研究表明４－ＡＴＲ功能基上的Ｎ与Ｍｏ（Ⅵ）发生配位键合，配位摩尔比为２∶１。４－ＡＴＲ具有较强的再生能力。
Experimental results show that 4 -amino - 1, 2,4 - triazole resin (4-ATR) has a good adsorption ability for Mo(Ⅵ) in the HAc-NaAc medium at pH 5.0. The statically saturated adsorption capacity is 189.5mg Mo (Ⅵ) /g resin, Mo (Ⅵ) adsorbed on 4-ATR can be eluted with 1 ~ 3molL^(-1) HCl quantitatively. The themodynamic parameters of adsorption, enthalpy change △H, free energy change △G^(298) and entropy change △S^(298) of adsorption (4-ATh) for Mo (Ⅵ) are -27.4kJmol^(-1), - 34.1kJmol^(-1), 22.6Jmol^(-1)K^(-1), respectively. Coordination molar ratio of -NH -N to Mo(Ⅵ) to Mo(Ⅵ) is 2∶1. The adsorption mechanism shows that the nitrogen atoms of the functional group of 4-ATR coordinated with Mo(Ⅵ) form coordination bond. The resin can regenerated and reused without apparent decreasing of sorption capacity.
出处
《有色金属》
CSCD
2000年第2期61-64,共4页
Nonferrous Metals
基金
浙江省教委资助!(97211)
关键词
氨基
三氮唑树脂
吸附机理
钼
吸附性能
4-amino -1,2,4-triazole resin, adsorption, adsorption mechanism, molybdenum
