Aly Mohamed I, Rizk S E
Hot Laboratories Center, Egyptian Atomic Energy Authority, Cairo, 13759, Egypt.
BMC Chem. 2024 Sep 28;18(1):186. doi: 10.1186/s13065-024-01288-y.
Solvent extraction of selenium(IV) ions from highly concentrated hydrochloric acid using 0.4 mol/L Aliquat 336 dissolved in kerosene was investigated. As a modifying agent, 1-octanol (10% v/v) was added to the organic phase to avoid the third phase formation. The effect of different parameters affecting the liquid-liquid extraction of selenium(IV) such as the acid concentration, shaking time, metal ion concentration in the aqueous phase, loading capacity, diluents, and temperature, was studied. The results indicate that selenium(IV) is extracted efficiently by 0.4 mol/L Aliquat 336 dissolved in kerosene. It was noticed that the extraction increased with the increase in the acid and Aliquat 336 concentrations, reaching an extraction percentage of about 92% at 8 mol/L HCl and 97.1% at 1 mol/L extractant. The extracted organic species is postulated to be [HSeOCl.2RNCl] by using the slope analysis method, and the value of K for selenium(IV) extraction was found to be 26.17 ± 2 M. The structure of the extracted organic species was confirmed by FT-IR. The effect of diluents using various aliphatic and aromatic diluents indicated that kerosene is the most preferred diluent. This is owing to safety ground purpose, economic consideration, the lower cost, availability, and lower toxicity. Thermodynamic parameters indicate the endothermic nature for the solvent extraction of selenium(IV) for the investigated system according to the positive value obtained of the enthalpy change (ΔH). Depending on the obtained results, the method was used to recover selenium(IV) from a simulated solution synthesized in hydrochloric acid medium, which is expected in anode slime leach liquor solution.
研究了用溶解于煤油中的0.4 mol/L Aliquat 336从高浓度盐酸中溶剂萃取硒(IV)离子。作为改性剂，向有机相中加入1-辛醇(10% v/v)以避免形成第三相。研究了不同参数对硒(IV)液-液萃取的影响，如酸浓度、振荡时间、水相中金属离子浓度、负载量、稀释剂和温度。结果表明，溶解于煤油中的0.4 mol/L Aliquat 336能有效萃取硒(IV)。注意到萃取率随酸和Aliquat 336浓度的增加而增加，在8 mol/L HCl时萃取率约为92%，在1 mol/L萃取剂时萃取率为97.1%。通过斜率分析法推测萃取的有机物种为[HSeOCl·2RNCl]，发现硒(IV)萃取的K值为26.17±2 M。通过傅里叶变换红外光谱(FT-IR)证实了萃取的有机物种的结构。使用各种脂肪族和芳香族稀释剂的稀释剂效果表明，煤油是最优选的稀释剂。这是出于安全、经济考虑，其成本较低、易于获得且毒性较低。热力学参数表明，根据获得的焓变(ΔH)正值，所研究体系中硒(IV)的溶剂萃取具有吸热性质。根据所得结果，该方法用于从盐酸介质中合成的模拟溶液中回收硒(IV)，阳极泥浸出液中预计会有这种溶液。
