Removal and Recovery of Levafix Brilliant Red ...

The transport and recovery of Levafix brilliant red E-4BA and Levafix brilliant red E-6BA were investigated using polypropylene (PP) and polytetrafluoroethylene (PTFE) fiber based supported liquid membrane containing tetra butyl ammonium bromide (TBAB) in coconut oil as a carrier. The influencing parameters studied are: pH of the feed solution, concentration of dye in the feed solution, extractant concentration, various kind of stripping agent, rate of stirring, time of transport, reusability of membrane and stability of membrane. Increase in TBAB concentration inside the membrane enhances the flux with its maximum value at 1.553×10-4 M TBAB. Further increase in the concentration of TBAB leads to decreased rate of transport due to increase in viscosity of membrane liquid. The optimum conditions for dye transport are: pH of feed ( 7 ± 0.1), 1.553×10-4 M extractant concentration, 350 rpm for stirring, 4.9×10-1 M potassium hydrogen phthalate as a stripping solution, the time of transport 6 h. It was noticed that flux values were increased with increasing dye concentration in the feed phase. Applying this study to textile wastewater, dyes were transported up to 98% in 6h. This recovery technique is rewarding to environment and economic.