J. Deischter

PhD Student at Institut of Technical and Macromolecular Chemistry, RWTH Aachen University @PalkovitsLab

[J. Deischter @DeischterJ]

I'm happy to share my work "Tailoring Activated Carbons for Efficient Downstream Processing: Selective Liquid‐Phase Adsorption of Lysine" as part of the #IASTwitterPoster Conference. @IntAdsSoc #Adsorption #Chemistry #Science @PalkovitsLab

[J. Mater. Chem. family @JMaterChem]

Issue 9 for @JMaterChem A front cover: Polymer-inspired covalent triazine frameworks from the carbonaceous side – influence of unexpected surface functionalisation on liquid-phase adsorption processes by Regina Palkovits and colleagues
Read it here: https://t.co/6VVm6TfpxX

[J. Deischter @DeischterJ]

@DavidDanaci @IntAdsSoc @PalkovitsLab We tried other adsorbents such as different types of zeolites. However the adsorption capacity was lower (around 100 mg/g). In terms of selectivity towards lysine, they also showed promising results and investigations will be done in the future.

[J. Deischter @DeischterJ]

I'm happy to share my work "Tailoring Activated Carbons for Efficient Downstream Processing: Selective Liquid‐Phase Adsorption of Lysine" as part of the #IASTwitterPoster Conference. @IntAdsSoc #Adsorption #Chemistry #Science @PalkovitsLab

[J. Deischter @DeischterJ]

@DavidDanaci @IntAdsSoc @PalkovitsLab Thank you for the good question @DavidDanaci! Indeed, the shape of the isotherms changed significantly upon the incorporation of surface oxygen functional groups. The O‐enriched activated carbon possessed a significantly higher water uptake at low relative pressure p/p0=0.1–0.6.

[J. Deischter @DeischterJ]

@alejandraolira @IntAdsSoc @IsabelMoritz 2/2 I was wondering how you explain the high adsorption capacity with your carbon materials. At what pH values did you perform the adsorption? Here is also a work from our group: 10.1021/acssuschemeng.6b00096. I'm looking forward to a fruitful discussion. Thank you :)

[J. Deischter @DeischterJ]

@alejandraolira @IntAdsSoc 1/2 Hello, my collegue @IsabelMoritz and I are also working on the adsorption of itaconic acid for the recovery in fermentation processes. We found out that very hydrophobic adsorbents showed high IA adsorption while having best desorption results using EtOH.

[J. Deischter @DeischterJ]

@Liliana92984271 @IntAdsSoc I really like the motivation of your work! Out of curiosity, did you try the adsorption process with real fermentation broths? And I was wondering what the selectivity in binary or multicomponent systems is?

[J. Deischter @DeischterJ]

@AniyohanaV @IntAdsSoc Congratulations on your great work! Could you elaborate the structure-adsorption relationship. What are the essential properties for a high separation? Thank you :)

[J. Deischter @DeischterJ]

@Liliana92984271 @IntAdsSoc Thank you for your answer! Very interesting work!:)

[J. Deischter @DeischterJ]

@Liliana92984271 @IntAdsSoc Great work! Could you please elaborate your results regarding the FT-IR measurements and the structure-adsorption relationship! Thank you in advance.

[J. Deischter @DeischterJ]

Please take a look at the work of my project partner @IsabelMoritz!

[Isabel Moritz @IsabelMoritz]

#IASTwitterPoster Itaconic Acid –
Selective Liquid Phase Separation
in Biorefineries

[J. Deischter @DeischterJ]

@JNA800389 @IntAdsSoc @PalkovitsLab In the case of using water as desorbent, lysine is recovered in its natural form. When going to application, and switching to a fermentation stream, lysine will probably be recovered as a salt

[J. Deischter @DeischterJ]

@JNA800389 @IntAdsSoc @PalkovitsLab Thanks for your question! Regeneration is done by using water as desorption solvent at pH of around 7. As the adsorption takes place at pH of 10 it is kind of a pH swing. Ihope this answers your question!

[J. Deischter @DeischterJ]

@rafa_morales90 @IntAdsSoc @PalkovitsLab 2/2 The water vapor adsorption isotherms were measured by using an Autosorb® iQ. Water vapor isotherms can be measured in the range of p/p0=0.1–0.9. The isotherms were measured at 30 °C. I hope i could answer your questions!

[J. Deischter @DeischterJ]

@rafa_morales90 @IntAdsSoc @PalkovitsLab 1/2 Thank you very much:) H2O sorption enables insights with regard to the surface polarity that result from the specific surface functionality and morphology of the carbon. This knowledge was used to improve the selectivity towards targeted molecules.

[J. Deischter @DeischterJ]

@RajendranArvind @IntAdsSoc @PalkovitsLab Thank you for your questions! We used concentrations of 10-30 g/L and glucose-lysine compositions of 1:1 (10 g/L). These conditions were used to simulate fermentation broths. The process is foreseen to be used in as a continuous, where the fermenation and adsorption are connected

[J. Deischter @DeischterJ]

@daaliaa22 @RSCAdvances @IntAdsSoc Congratulations on your great work! Did you also measure breakthrough curves and what adsorption capacities did you achieved for your system compared to batch? Thank you😊

[J. Deischter @DeischterJ]

@daaliaa22 @IntAdsSoc @PalkovitsLab Thank you very much! Boehm titration is used to determine the functional groups present on the surface of the activated carbons. Different bases such as NaOH or NaHCO3 are used as titration agent to determine the amount of groups like carboxylic acids, lactones or phenols.