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用乙基纤维素作膜材将三辛胺(简称TOA)微胶囊化,用于萃取酸性水溶液中的Cr_2O_7~(2-)离子.通过搅拌法萃取实验表明,TOA被微胶囊化后对铬离子仍具有较高的萃取速度,实验测定渗透系数为6.78×10~(-6)m/min,并能有效地防止乳化现象.将微胶囊制备成填充柱对Cr_2O_7~(2-)进行萃取实验,对外相水的流速、微胶囊粒径、柱的重复使用次数与萃取客量的关系进行了研究.当粒径为100—200μm,流速为30ml/min,每毫升微胶囊可萃取铬47.5mg/ml,填充柱重复使用15次,芯材TOA无明显地损失.用NaOH水溶液对已达到萃取饱和的填充柱进行反萃取,可以将含铬190ppm的溶液浓缩到6×10~4ppm以上.
The microcapsules of trioctylamine (TOA) were microencapsulated with ethylcellulose for extraction of Cr_2O_7 ~ (2-) ions in acidic aqueous solution.The extraction experiments by stirring method showed that TOA was microencapsulated, The ion still has a high extraction rate, and the permeability coefficient is 6.78 × 10 -6 m / min, which can effectively prevent the emulsification.Extraction of Cr 2 O 7 2- with microcapsule as packed column Experiments, the flow rate of external phase water, the size of the microcapsules, the number of repeated use of the column and the extraction capacity were investigated.When the particle size was 100-200μm, the flow rate was 30ml / min, mg / ml, the packed column was reused for 15 times, and the TOA of the core material was not obviously lost.Using NaOH aqueous solution to strip the packed column saturated with extraction, the solution containing 190ppm chromium could be concentrated to 6 × 10-4ppm above.