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Removal of Zwitterionic Rhodamine B Using Foam Separation
Yusuke Goto1, Yuya Nema1, Keisuke Matsuoka1
1Faculty of Education, Laboratory of Chemistry, Saitama University.
Journal of Oleo Science
|June 12, 2020
Summary
Foam separation effectively removes rhodamine B using anionic or cationic surfactants. However, electrostatic interactions are crucial, as rhodamine B removal failed in acidic conditions and with cationic rhodamine 6G.
Area of Science:
- Environmental Chemistry
- Separation Science
Background:
- Foam separation is a technique for removing dissolved substances from solutions.
- Surfactants play a key role in adsorbing target molecules for removal.
Purpose of the Study:
- To investigate the effectiveness of foam separation for removing rhodamine dyes.
- To determine the influence of surfactant type and solution pH on removal efficiency.
Main Methods:
- Foam separation experiments were conducted using rhodamine B and rhodamine 6G.
- Anionic (sodium dodecyl sulfate: SDS) and cationic (dodecyltrimethylammonium chloride: DTAC) surfactants were employed.
- Solution pH was varied to assess its impact on dye removal.
Main Results:
- Rhodamine B was successfully removed using both SDS and DTAC surfactants.
- Removal of rhodamine B was unsuccessful in a strongly acidic DTAC solution (pH 2) due to molecular charge change.
- Cationic rhodamine 6G could not be removed from the DTAC solution.
Conclusions:
- Electrostatic interactions between the surfactant and the target molecule are critical for effective foam separation.
- The molecular form and charge of the target substance significantly influence its removal efficiency.
