N-苯并噻唑基正丁基酰亚胺萃取汞的研究

Study on the extraction of mercury with N-benzothiazolyl normal-butyl imide

以2-氨基苯并噻唑和正丁酰氯为原料合成了新型萃取剂N-苯并噻唑基正丁基酰亚胺(简写成HY)。通过元素分析、红外光谱、核磁共振等测试手段对其组成结构进行了表征,表明HY萃取剂是通过其酰亚胺-NH基团中的N和羰基中的氧与Hg2+配合形成HgY2螯合物。考查了HY浓度、pH值、温度和水中的一些常见阳离子及阴离子对Hg2+萃取的影响。在选定的最佳条件下用该萃取剂萃取1.0mmol/L Hg2+离子,500 mmol/L NO3-,400 mmol/L SO42-,50 mmol/L Ni2+、Zn2+、Cd2+,40 mmol/L Cu2+、Pd2+,20 mmol/L Fe3+,10 mmol/L PO43-不干扰HY对Hg2+的萃取。根据分配比与温度的关系求出了萃取反应的ΔH0值,此值表明了该萃取反应为吸热反应。

A novel extracting agent called N-benzothiazolyl normal-butyl imide（HY） was synthetized using 2-amino benzothiazole and butyryl chloride as materials.The composition and structure of product were characterized by elementary analysis,infrared spectrum and nuclear magnetic resonance.The results indicated that HY formed HgY2 chelate with Hg2＋ by N in-NH group and O in carbonyl group.The effect of HY concentration,pH,temperature and common cations and anions in water on the extraction of Hg2＋ was investigated.In the extraction of 1.0 mmol/L Hg2＋ with this extracting agent under selected optimal conditions,500 mmol/L of NO3-;400 mmol/L of SO42-;50 mmol/L of Ni2＋,Zn2＋ and Cd2＋;40 mmol/L of Cu2＋、Pd2＋;20 mmol/L of Fe3＋ and 10 mmol/L of PO43-did not interfere with the extraction of Hg2＋ by HY.Based on the relationship between distribution ratio and temperature,the value of ΔH0 of this extraction reaction was obtained,indicating that this reaction was endothermic reaction.