Study On The Extraction Of Heavy Metal Ions By Tri-(2-butylamino)methyl Phosphineoxide

The heavy metals are applied more and more widely in the industrial and agricultural production, national defense and security.While, the heavy metal pollution in the environment is increasingly serious by human activities,environmental quality decline, and endanger human health directly, the heavy metal has become the major pollution in the environment, and focus in environmental governance. In general, the processing technology of heavy metal pollution include precipitation method, electrochemical method, adsorption, extraction and so on. As a kind of traditional separation technology,solvent extraction is simple of operation, mature technology for separation and enrichmen for heavy metal ions from water sample. The extracting agent selection is the key technology of the extraction. In this paper, tri-(2- butyl amine methylene) phosphine oxide(NSC) was selected as extractant agent, and the heavy metals lead, cadmium, copper as the object of study, the extraction behavior of the material on the three kinds of heavy metal ions were systematically studied. Especially for cadmium, lead, NSC had the advantage of high extraction efficiency, simple operation. The use of NSC reduced the amount of organic phase, the extraction cost is cut down,and organic solvent pollution was less.Three(2-butyl amine methylene) phosphine oxide had good application prospect in separation and enrichment of heavy metals, industrial wastewater and heavy soil pollution.The main contents as follows.The extraction behavior of NSC was investigated on Cd2+?Pb2+?Cu2+. These conditions such as phase ratio, acidity, concentration of extractant, extraction time, temperature, metal ion concentration were studied and the optimal extraction conditions had been achieved. In the cadmium experiment,three commercial organic phosphorus compounds were selected were selected and compared with NSC.The results indicsted that NSC had obvious advantages in the extraction field.At the same time, the reverse extraction experiment was carried out for the effective recovery of heavy metal ions. These findings suggest:1?The extraction rate of cadium reached above 95% in a single-stage under the condition of 20% for extractant concentration, 1:1 for phase ratio. The load capacity of the extractant was above 900 mg/L. The stripping experiment showed that NH4 Cl had a good stripping effect on the Cd2+.The contrast test indicated NSC had the advantages of high extraction efficiency, simple operation, low cost of extraction. For the low concentration of Cd2+, After extraction, reverse extraction steps, the enrichment factor of the low concentration of Cd2+(0.1mg/L and 1.0 mg/L) was more than 15 times,the aqueous solution of 5 mg/L Cd2+, up to 8 times. It playd an important role in separation and recycling for the low concentration of cadmium ions.2?The extraction experiment of lead displayed that the extraction rate of lead reached above 95% in a single-stage under the condition of 5% for extractant concentration, 1:1 for phase ratio.However, the stripping effect was less than ideal.3?The extraction experiment of copper showd that, the organic phosphorus on the Cu2+ extraction effect was poor, approximately,the extraction efficiency was 85% at phase ratio 1. The stripping experiment showed that the stripping efficiency of 0.1 mol/L HNO3 was about 80%.