Interfacial adsorption of methyl orange in liquid phase of foam fractionation using dodecyl dimethyl betaine as the collector

- BS12 was an environmental and effective collector for the removal of dyes.
- Interfacial adsorption in the liquid pool was important for foam fractionation.
- The optimal conditions for the MO removal were pH of 5 and BS12 of 0.40 g/L.
- The vertical sieve tray internal can improve the interfacial adsorption of MO.
- The maxima of surface excess and enrichment ratio of MO increased 22.7% and 51.5%.