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Conférence du Pr. Sun-Young BAE

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Fabrication of Microextraction Needle with Polymeric Sorbents and Hydrochar
Mercredi 17 janvier 2018 à 11h00
Campus de Beaulieu / Amphi D. Grandjean

Abstract of the Conference

Fabrication of Microextraction Needle with Polymeric Sorbents and Hydrochar

Department of chemistry, Seoul Women’s University, Korea

Sorbents have been used to remove organic/inorganic analytes such as atoms, ions, and molecules from different media. The removal mechanisms can be adsorption and/or absorption. Adsorption is a surface-based process while absorption involves the entire volumes of the sorbent. Specific material types of sorbents can be categorized as activated alumina, activated carbon, calcium sulfate, calcium oxide, clay and clay silicates, molecular sieve or zeolites, organic polymers, and silica gel. In particular, organic polymers are chains of repeating carbon based molecules used as adsorbents in size-exclusion chromatography and gas separation processes with high retention power and selectivity. Sorbents can be artificially manufactured or naturally occurred.
In our laboratory, a needle for microextraction has been fabrication with a sorbent to extract the target analytes from the headspace of the sample. The polymeric sorbents synthesized in our lab include PDMS-based polymers via sol-gel process and aniline-based polymers via electrochemical process. The sorbents were coated inside of the needle or on the surface of the wire which was inserted into the needle for extraction. The advantage of coating sorbent inside the needle would be easy to handle because it was not exposed to the environment.. The polydimethylsiloxane was mixed with additives such as polyacrylic acid, ß-cyclodextrin, polystyrene resin cross-inked with 1% divinylbenzene, polyethylene glycol, polyvinyl alcohol, and many more using a sol-gel technique. Polyaniline with (without) multi-walled carbon nanotube was electronically polymerized directly on the wall of the needle using cyclic voltammetry. The synthesized sorbents were characterized for physicochemical properties measured by the Fourier-transform Infrared spectrometry, scanning electron microscopy (SEM), atomic force microscopy (AFM) were applied. Extraction method consists of the process including sorbent synthesis, sorption, and desorption. All conditions were optimized specifically for the target analytes. The proposed method has been validated with respect to limit of detection, limit of quantitation, dynamic range, reproducibility, accuracy, and recovery. As a result, the sorbents with differen distribution coefficient to enhance the extraction have been synthesized and investigated successfully. The fabricated microextraction needle with polymeric sorbents has been applied to the headspace samples.
Hydrochar, which was hydrothermally carbonized from biomass such as animal manure, food waste, and coffee sludge, was generated in a reactor and investigated as an adsorbent for heavy metals, BTEX, and herbicides. It has received a great attention due to its potential on environmental sustainability. Hydrochar was generated at the optimal conditions via hydrothermal carbonization. Then, activation to improve sorption capacity and magnetization to modify the removal process after sorption were conducted for sorption tests. Sorption isotherm model was selected to provide fundamental information for solution to problems to be answered.
[1] H-L. Jeon, H-H. Son, S. Bae, D-S. Lee , Bull. Korean Chem. Soc. 36 (2015) 2730.
[2] Y. Bang, Y. Hwang, S. Lee, S. Bae, J. Sep.Sci. 19 (2017) 3839.
[3] K. Ro, J. R. V. Flora, S. Bae, Judy A. Libra, Nicole, D. Berge, A. Alvarez-Murillo, L. Li, ACS Sustainable Chemical Engineering, 5,7317-7324.


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