(中南大学 化学化工学院，长沙 410083)
摘 要: 合成一种新型的表面活性剂——N-丁氧基丙基-S-[2-(肟基) 丙基]二硫代氨基甲酸酯(BOPHPDT)，通过红外光谱、核磁共振氢谱及碳谱对其结构进行确认。采用微浮选、接触角、动电位、X射线光电子能谱(XPS)对BOPHPDT浮选孔雀石的疏水机理进行研究。结果表明：BOPHPDT浮选孔雀石的优选pH值为5.5~8.0，其吸附于孔雀石表面带正电的铜活性位，降低孔雀石的动电位，增大其接触角，增强其表面疏水性。XPS分析进一步表明，BOPHPDT通过其NH—C(=S)—S和C=N—OH官能团与孔雀石表面的铜原子结合形成Cu—S和Cu—O键而化学吸附于孔雀石表面。
关键字: N-丁氧基丙基-S-[2-(肟基) 丙基]二硫代氨基甲酸酯；孔雀石；浮选；疏水机理
（School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:A novel surfactant—N-butoxypropyl-S-[2-(hydroxyimino) propyl] dithiocarbamate ester (BOPHPDT) was synthesized and characterized by FTIR, 1H NMR and 13C NMR. Its hydrophobic mechanism to malachite flotation was investigated by micro-flotation, contact angle, zeta potential, and XPS. The results show that BOPHPDT exhibits excellent flotation performance to malachite at pH 5.5-8.0 and might anchor on the positively charged copper sites of malachite surfaces, rendering a decreased zeta potential, an increased contact angle and an enhanced hydrophobicity of malachite. XPS further elucidates that BOPHPDT chemisorbs on malachite surface by reaction of its NH—C(=S)—S and C=N—OH groups with the surface copper atoms to form Cu—S and Cu—O bonds.
Key words: N-butoxypropyl-S-[2-(hydroxyimino) propyl] dithiocarbamate ester; malachite; flotation; hydrophobic mechanism
