研究了氯化钠-二乙基二硫代氨基甲酸钠(DDTC)-酚酞体系分离富集铜的新方法。探讨了二乙基二硫代氨基甲酸钠溶液用量、酚酞溶液用量、各种盐和酸度等因素对Cu2+富集率的影响,讨论了Cu2+的富集机理。结果表明,控制pH 6.0,在0.5 g NaCl存在下,当1.0×10-2 mol/L DDTC溶液用量为2.00 mL,50 g/L酚酞乙醇溶液用量为1.00 mL时,Cu2+与DDTC形成的螯合物沉淀[Cu(DDTC)2]可被定量吸附至微晶酚酞表面,形成界面清晰的液-固两相,而在此条件下Cd2+、Zn2+、Pb2+、Fe2+、Al3+等不被吸附,实现了Cu2+与这些金属离子的定量分离,据此建立了分离富集Cu2+的新方法,并成功用于合成水样中Cu2+的定量分离,富集率为93.0%~105.4%。
Abstract
A novel method for separation and enrichment of copper with sodium chloride-sodium diethyldithiocarbamate-phenolphthalein system was investigated. The effects of different parameters,such as the dosages of sodium diethyldithiocarbamate(DDTC) solution and phenolphthalein(PP) solution,various salts and acidity on the enrichment yield of Cu2+ have been investigated,the enrichment mechanism was examined. The results showed that,in the presence of 0.5 g of NaCl,when 2.00 mL of 1.0×10－2 mol/L DDTC solution and 1.00 mL of 50 g/L phenolphthalein ethanol solution was selected,the chelate precipitate [Cu(DDTC)2] formed with Cu2+ and DDTC could be quantitatively adsorbed on the microcrystalline phenolphthalein surface at pH 6.0,forming liquid-solid phases with a clear interface,while in this condition,Cd2+,Zn2+,Pb2+,Fe2+ and Al3+ were not adsorbed,thus achieving the quantitative separation of Cu2+ from these metal ions. Consequently,a novel method for separation and enrichment of Cu2+ was established. This method was successfully applied to quantitative separation and enrichment of Cu2+ in the synthetic water samples with enrichment yield of 93.0%-105.4% .
关键词
铜 /
分离富集 /
二乙基二硫代氨基甲酸钠 /
微晶酚酞
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Key words
copper /
separation and enrichment /
sodium diethyldithiocarbamate /
microcrystalline phenolphthalein
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中图分类号：
O652.6
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参考文献
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基金
广东省自然科学基金项目(S2012010010978)
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