I am keen to know the basicity of both the dyes. Between Rhodamine B and auramine dye, which is more basic? In an adsorption, study rhodamine seems to be adsorbed up to some extent however the same adsorbent shows no effect on auramine dye. What could be the possible reasons? I was thinking of the difference in surface charge in both the dye might have contributed to such an outcome. But not sure about the exact background mechanism.
Hi Jyotsna,
It is clear from the structure auramine dye is more basic and have positive charge and may be the surface charged in negative charge " electrostatic force" if compared with Rhodamine B. Ok, see attached file.
wish you success,
Hi Jyotsna,
It is clear from the structure auramine dye is more basic and have positive charge and may be the surface charged in negative charge " electrostatic force" if compared with Rhodamine B. Ok, see attached file.
wish you success,
Hello Jyotsna,
both basic but Auramine is more basic. I would test adsorption of an acidic dye as a control on my sorbent if I suspect that my sorbent performs better on basic dyes.
I would also consider point of zero charge measurement for my adsorbent
Please see this good paper by Postai et al
Adsorption of rhodamine B and methylene blue dyes using waste of seeds of Aleurites Moluccana, a low cost adsorbent
Hope it will help
Amin
Hello Jyotsna,
according to the valuable answers of the above answerers, please give us the following infos:
- In what a medium (pure water or waste water??) and with what an adsorbent are you working?
- In what a pH and ionic strenght e.g salt concentration are you working?
- Have you bought auramine O hydrochloride and Rhod B chloride (or another counter anion)?
- Are you using the AR mixture (Auramine O / Rhodamine B ) of any supplier?
- With increase of the concentration, both dyes aggregate (see p.e. this link).
https://www.researchgate.net/publication/271762485_Photophysics_of_Auramine_O_adsorbed_on_solid_clays
-What a concentration are you using?
Here a hint for the determination of the pKb values of Auramine O and Rhodamine B
http://hi-tec.tripod.com/OFFLINE/pka.pdf
Thank you in advance and good luck
JRG
Article Photophysics of Auramine O adsorbed on solid clays
Hi Jyotsna
According to the structure, Auramine dye is more basic.
Regards
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