论文部分内容阅读
4-氨基-三氮唑树脂(4-ATR)对Cr(Ⅵ)的吸附在pH=1时最佳,Cr~(3+)基本不被吸附。两者分离系数β_(CrVI/Cr~(3+)=5.52×10~3.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k_(21·c)=1.59×10~(-3)S~(-1)、K_(25·c)=1.87×10~(-3)S~(-1)、K(30·c)=2.2×10~(-3)S~(-1);表观吸附活化能E_a=26.26kJ/mol;吸附热力学函数ΔH=6.16kJ/mol,ΔG~(298)=-15.1kJ/mol,ΔS~(298)=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%。
The adsorption of Cr (Ⅵ) by 4-amino-triazole resin (4-ATR) was the best at pH = 1, while Cr 3+ was not adsorbed. The separation coefficient β_ (CrVI / Cr ~ (3 +)) was 5.52 × 10 ~ 3. The static saturation capacity was 179.4 mg Cr (Ⅵ) / g resin.The elution was achieved with 5 mol / L HCl. (21 · c) = 1.59 × 10 ~ (-3) S ~ (-1), K_ (25 · c) = 1.87 × 10 ~ (-3) S ~ 30 · c) = 2.2 × 10 -3 S -1; the apparent activation energy for adsorption E_a = 26.26 kJ / mol; the thermodynamic function ΔH = 6.16 kJ / mol, △ G 298 = -15.1 (298) = 339.8J · mol · K. Adsorption mechanism shows that N and Cr (Ⅵ) on the 4-ATR functional group coordinate and the coordinate molar ratio is 1: 1.Using this Resin treatment Cr (Ⅵ) plating wastewater, chromium recovery up to 95.7%.