中华医学超声杂志

应用化学 ›› 1992, Vol. 0 ›› Issue (6): 31-35.

• 研究论文 • 上一篇    下一篇

4-氨基-三氮唑树脂对铬(Ⅵ)的吸附、机理及应用

陈义镛, 毛伟红, 王耐冬   

  1. 杭州大学化学系, 杭州 310028
  • 收稿日期:1991-12-19 修回日期:1992-03-25 出版日期:1992-12-10 发布日期:1992-12-10
  • 基金资助:
    国家自然科学基金

ADSORPTION AND ADSORPTION MECHANISM OF 4-AMINO-1,2,4-TRIAZOLE RESIN FOR Cr(Ⅵ)

Chen Yiyong, Mao Weihong, Wang Naidong   

  1. Department of Chemistry, Hangzhou University, Hangzhou 310028
  • Received:1991-12-19 Revised:1992-03-25 Published:1992-12-10 Online:1992-12-10

PDF

467

被引次数

15 | 4

摘要： 4-氨基-三氮唑树脂(4-ATR)对Cr(Ⅵ)的吸附在pH=1时最佳,Cr3+基本不被吸附。两者分离系数βCrⅥ/Cr3+=5.52×103.静态饱和容量为179.4mg Cr(Ⅵ)/g树脂。用5mol/L HCl能还原洗脱。测得不同温度下的吸附速率常数k21·c=1.59×10-3S-1、K25·c=1.87×10-3S-1、K30·c=2.2×10-3S-1;表观吸附活化能Ea=26.26kJ/mol;吸附热力学函数ΔH=6.16kJ/mol,ΔG298=-15.1kJ/mol,ΔS298=339.8J.mol·K.吸附机理表明4-ATR功能基上的N与Cr(Ⅵ)发生配位键合,配位摩尔比为1:1.利用此树脂处理含Cr(Ⅵ)电镀废水,铬回收率可达95.7%。

关键词: 4-氨基-三氮唑树脂, 铬, 吸附

Abstract: Cr(Ⅵ) was quantitatively adsorbed by 4-amino-1,2,4-triazole resin(4-ATR) in a medium of pH=1,but Cr3+ almost could not be adsorbed. The separation coefficient βCr (Ⅵ)/Cr3+ is as high as 5.52×103. The statically saturated sorption capacity is 179.4mg Cr(Ⅵ)/gresin [3.45 mmol Cr(Ⅵ)/g resin]. Cr(Ⅵ) adsorbed on 4-ATR can be reductively eluated by 5mol/L HCL. The sorption rate constants determined under various temperatures wereK21·C=1.59×1O-3S-1,K25·C=1.87×10-3S-1 and K30·C=2.2×10-3S-1,respectively. The apparent activation energy of sorption Ea is 26.26kJ/mol.The thermodynamic parameters of sorption,enthalpy ΔH298,freeenergy ΔG298,and entropy ΔS298 of sorption (4-ATR) for Cr(Ⅵ) are 86.16, -15.1 kJ/mol,and 339.8 J/mol.K,respectively.Coordination molar ratio of Cr(Ⅵ)to is 1:1. The sorption mechanism shows that the nitrogen atoms of the functional group of 4-ATR coordinated with Cr(Ⅵ) to form coordination bond. The 4-ATR can be used in the separation of Cr(Ⅵ) from the waste electroplating water. The percentage of recovery of chromium is 95.7%.

Key words: aminotriazole, chromium ion, adsorption

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