N-丁氧基丙基-S-[2-(肟基)丙基]二硫代氨基甲酸酯浮选孔雀石的疏水机理

Hydrophobic mechanism of N-butoxypropyl-S-[2-(hydroxyimino) propyl] dithiocarbamate ester to malachite flotation

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p H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。

A novel surfactant—N-butoxypropyl-S-[2-（hydroxyimino） propyl] dithiocarbamate ester（BOPHPDT） was synthesized and characterized by FTIR, ~1 H NMR and 13 C 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.