León Gerardo, Hidalgo Asunción María, Miguel Beatriz, Guzmán María Amelia
Departamento de Ingeniería Química y Ambiental, Universidad Politécnica de Cartagena, Paseo Alfonso XIII,30203 Cartagena, Spain;
Departamento de Ingeniería Química, Campus de Espinardo, Universidad de Murcia, 30100 Murcia, Spain.
Membranes (Basel). 2020 Dec 17;10(12):436. doi: 10.3390/membranes10120436.
Pertraction of Co(II) through novel supported liquid membranes prepared by ultrasound, using bis-2-ethylhexyl phosphoric acid as carrier, sulfuric acid as stripping agent and a counter-transport mechanism, is studied in this paper. Supported liquid membrane characterization through scanning electron microscopy, energy-dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy shows the impregnation of the microporous polymer support by the membrane phase by the action of ultrasound. The effect on the initial flux of Co(II) of different experimental conditions is analyzed to optimize the transport process. At these optimal experimental conditions (feed phase pH 6, 0.5M sulfuric acid in product phase, carrier concentration 0.65M in membrane phase and stirring speed of 300 rpm in both phases) supported liquid membrane shows great stability. From the relation between the inverse of Co(II) initial permeability and the inverse of the square of carrier concentration in the membrane phase, in the optimized experimental conditions, the transport resistance due to diffusion through both the aqueous feed boundary layer (3.7576×10 s·m) and the membrane phase (1.1434×10 s·m), the thickness of the aqueous feed boundary layer (4.0206×10.0490×10 m·s) , have been determined.
本文研究了以二（2-乙基己基）磷酸为载体、硫酸为反萃剂，采用超声制备的新型支撑液膜对Co(II)的萃取，萃取过程采用反向传输机制。通过扫描电子显微镜、能量色散X射线光谱和傅里叶变换红外光谱对支撑液膜进行表征，结果表明在超声作用下，膜相浸渍了微孔聚合物载体。分析了不同实验条件对Co(II)初始通量的影响，以优化传输过程。在这些最佳实验条件下（进料相pH值为6，产物相中硫酸浓度为0.5M，膜相中载体浓度为0.65M，两相搅拌速度均为300 rpm），支撑液膜表现出很高的稳定性。根据Co(II)初始渗透率的倒数与膜相中载体浓度平方倒数之间的关系，在优化的实验条件下，测定了通过水相进料边界层（3.7576×10 s·m）和膜相（1.1434×10 s·m）扩散引起的传输阻力，以及水相进料边界层的厚度（4.0206×10.0490×10 m·s）。
