6-(4'-烟酰胺基)苯基-3-(3'-吡啶基)哒嗪并[3,2-c]1,2,4-三唑的制备及其对Hg(Ⅱ)离子吸附性能

Preparation of 6-( 4'-Nicotinamido) phenyl-3-( 3'-pyridinyl)pyridazino [3,2-c]1,2,4-triazole and Its Adsorption Performance for Mercury(Ⅱ) Ions

利用3-（4-溴苯基）-6-氯哒嗪和烟肼合成了新化合物6-（4’-烟酰胺基）苯基-3-（3’-吡啶基）哒嗪并[3,2-c]1,2,4-三唑（K2）,通过红外光谱、核磁共振氢谱和碳谱等技术手段对化合物K2进行了表征。化合物K2可以选择吸附Hg（Ⅱ）离子。通过火焰原子吸收法（FAAS）检测Hg（Ⅱ）离子吸附,结果表明,在pH值6.08.0条件下,20 min即可达吸附平衡,饱和吸附量为45.60 mg/g。以0.50 mol/L HCl与1.00 mol/L硫脲作为洗脱剂,洗脱率达97%。对Cd（Ⅱ）、Co（Ⅱ）、Ni（Ⅱ）、Zn（Ⅱ）和/Mn（Ⅱ）的选择性系数分别为5.67、6.70、10.20、8.90和9.21,体现了化合物K2良好的选择吸附能力。化合物K2对Hg（Ⅱ）离子的吸附符合准二级动力学反应控制的化学吸附过程和Langmuir模型。

6- （4＇-Nicotinamido） phenyl-3- （ 3 ＇-pyridinyl ） pyridazino [ 3,2-c ] 1,2,4-triazole （ K2 ） was prepared by 3-（4-bromophenyl）-6-ehloropyridazine and nicotinic hydrazide, and characterized by infrared spectroscopy, 1H- and 13C- nuclear magnetic resonance spectroscopy. The adsorptive properties and the selectivity of compound K2 for the separation of Hg2＋ were investigated. The results indicate that the maximum adsorption capacity is 46.50 mg/g. The adsorption capacity reaches equilibrium within 20 rain at pH 6. 0 - 8.0. Using 0. 50 mol/L HC1 and 1.00 mol/L thiourea as desorption solvent, the desorption rate is more than 97%. The selective factor（a） values of Cd（Ⅱ）、Co（Ⅱ）、Ni（Ⅱ）、Zn（Ⅱ） and /Mn（Ⅱ） are 5.67, 6. 70, 10. 20, 8.90 and 9.21, respectively. These indicate that compound Kz has excellent adsorption and selective properties. The experimental data follow the model. Langmuir adsorption model and a pseudo-second-order