Recently, we reported a novel system in which simultaneous conversion of Cr(VI) and dyes is achieved ("Iron species in layered clay: Efficient electron shuttles for simultaneous conversion of dyes and Cr(VI)". Full-text available in https://www.researchgate.net/profile/Zhaohui_Wang12/contributions/). However, because dyes are strongly adsorbed to clay surface and interlayer, it is difficult to characterize the TOC changes. Dyes can be removed from clay using acetone solvent. But acetone leads to high "artificial" TOC value. Is there any other method to measure it?
If you evaporate the extraction solvent and resuspent the extracted dye and due degradation products in water you have solved the problem with artificial TOC.
This leaves the problem of proving that the solvent used extract all the TOC from clay.
Another theoretical possibility is to dissolve the clay in strong acid and analyse the dissolved sample. I have not tried this but our TOC machine tolerates quite acidic samples.
That's right. Evaporating the organic solvent may be feasible. Addition of strong acid may probably lead to oxidation of dyes.
Thank you, Henrik...
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