DTC类重金属捕集剂对Cu~(2+)去除的实验研究

以乙二胺、氢氧化钠、二硫化碳等为原料,在常温下合成一种橘红色的液体产品DTC-E,经测定,其主要有效成分为二硫代氨基甲酸盐(DTC类).以模拟含铜废水为处理对象,系统考察了反应体系各因素对DTC-E捕集去除游离态Cu2+效果的影响,并将其应用于实际电镀含铜废水的处理以进行验证.研究结果表明,DTC-E对反应体系的pH值适用范围(4~12)较广;最佳反应pH值和DTC-E投加量分别为8.0和1.0倍化学计量比(DTC∶Cu2+);絮凝剂的存在能够显著增强DTC-E对游离Cu2+的捕集去除效果;相比之下,反应体系的温度和反应时间对游离Cu2+的去除效率影响很小.

Removal of copper ions in polluted waters by DTC heavy metal chelator

DTC-E, a kind of heavy metal chelator, is synthesized with ethylenediamine, sodium hydroxide, carbon disulfide and other raw materials. We had confirmed dithiocarbamates as the active ingredient of this orange-red liq- uid product. Simulated copper wastewater had been treated with DTC-E. The results reveal that three factors have important impact on the removal efficiency of free copper ions, such as pH value, dosage of DTCE and flocculant. Specifically, DTC E can remove copper ions in a relative pH value wide, and the optimum dosage is 1.0 ratio of DTC E to copper ions. Usage of flocculant greatly improves the efficiency of Cu2＋ by DTC-E. In contrast, tempera- ture and reaction time almost have no effect on the removal of copper ions.