Citation: Chen Yiyong, Mao Weihong, Wang Naidong. ADSORPTION AND ADSORPTION MECHANISM OF 4-AMINO-1,2,4-TRIAZOLE RESIN FOR Cr(VI)[J]. Chinese Journal of Applied Chemistry, ;1992, 9(6): 31-35. shu

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

1.
Department of Chemistry, Hangzhou University, Hangzhou 310028

Received Date: 19 December 1991
Available Online: 25 March 1992

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 β_{Cr(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 were k_21℃=1.59×1O^-3S^-1,k_25℃=1.87×10^-3S^-1 and k_30℃=2.2×10^-3S^-1,respectively. The apparent activation energy of sorption E₂ 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·Κ,respectively.Coordination molar ratio of Cr(Ⅵ)to -NH-H???19920607??? 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.%., 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 β_{Cr(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 were k_21℃=1.59×1O^-3S^-1,k_25℃=1.87×10^-3S^-1 and k_30℃=2.2×10^-3S^-1,respectively. The apparent activation energy of sorption E₂ 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·Κ,respectively.Coordination molar ratio of Cr(Ⅵ)to -NH-H3+ almost could not be adsorbed. The separation coefficient β_{Cr(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 were k_21℃=1.59×1O^-3S^-1,k_25℃=1.87×10^-3S^-1 and k_30℃=2.2×10^-3S^-1,respectively. The apparent activation energy of sorption E₂ 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·Κ,respectively.Coordination molar ratio of Cr(Ⅵ)to -NH-H 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.%., 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 β_{Cr(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 were k_21℃=1.59×1O^-3S^-1,k_25℃=1.87×10^-3S^-1 and k_30℃=2.2×10^-3S^-1,respectively. The apparent activation energy of sorption E₂ 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·Κ,respectively.Coordination molar ratio of Cr(Ⅵ)to -NH-H 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.%.
- aminotriazole,
- chromium ion,
- adsorption
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沈阳化工大学材料科学与工程学院沈阳 110142