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( Erwin C. Escobar ),( Wook-jin Chung ),( John Edward L. Sio ),( Khino J. Parohinog ),( Hern Kim ),( Grace M. Nisola ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-
A thia-functionalized polymeric adsorbent was prepared for the recovery of Pd<sup>2+</sup> and Pt<sup>4+</sup>. The adsorbent is hydrophilic with a negative surface charge across a wide pH range, and exhibits a highly porous morphology resulting in a high BET surface area (643.47 ㎡ g<sup>-1</sup>). When applied to autocatalyst leachate, selective recovery of Pd<sup>2+</sup> and Pt<sup>4+</sup> may be achieved at pH 1 and pH 4, respectively. Maximum recovery of Pd<sup>2+</sup> can be achieved within 10 min of adsorption with a very high sequestration capacity of 370 mg g<sup>-1</sup>. On the other hand, 70 mg g<sup>-1</sup> Pt<sup>4+</sup> can be recovered within 60 min. The polymeric adsorbent withstands acid-stripping procedures allowing for its repeated use and regeneration. This study was supported by the National Research Foundation of Korea (NRF) funded by The Ministry of Science and ICT (2021R1A2C2093746 and 2020R1A2C1003560) and Basic Science Research Program through the Ministry of Education (2020R1A6A1A03038817)
Organic ligands for the development of adsorbents for Cs+ sequestration: A review
Erwin C. Escobar,John Edward L. Sio,Rey Eliseo C. Torrejos,Hern Kim,Wook-Jin Chung,Grace M. Nisola 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
Sorbents utilizing organic molecules as Cs+-selective ionophores have increasingly gained attention overthe years as the need for stable and reusable materials became ever more apparent with the poor performanceof inorganic sorbents in acidic and alkaline aqueous environments. Aside from this, organic moleculesoffer a great degree of flexibility in terms of structure, function, and performance which can beharnessed for sorbent development. As such, various kinds of organic ligands have been employed forsorbent preparation, which include macrocycles like calixarenes and crown ethers, and acyclic moleculeslike tetraphenylborate and resorcinol formaldehyde. In this review, organic-based sorbents and ligandsfor Cs+ are described and compared, and the mechanisms underlying their efficacy for Cs+ sequestrationare discussed. Improvements to ligand and sorbent development are proposed to address issues onadsorption selectivity, capacity, and material reusability. Moreover, a platform for the preparation ofstimuli-responsive ligands and sorbents is presented.
( Khino J. Parohinog ),( Hiluf Fissaha ),( Erwin C. Escobar ),( John Edward L. Sio ),( Hern Kim ),( Grace M. Nisola ),( Wook-jin Chung ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-
The temperature-responsive Pd<sup>2+</sup>-selective crown ether (Dithia-B18CE6) and N-Isopropylacrylamide (NIPAM) polymer brushes were grafted via SI-ATRP on the acid-stable multi-walled carbon nanotube (MWCNT) support material and was utilized as a Pd<sup>2+</sup>-selective adsorbent. The temperature-responsive composite adsorbent was characterized and tested to determine its Pd<sup>2+</sup> adsorption capacity and kinetics. The adsorbent has high selectivity towards Pd<sup>2+</sup> as compared to other cations present in the simulated catalytic converter leachate solution. Recyclability experiment was done by temperature-swing adsorption-desorption cycles for the capture and release of Pd<sup>2+</sup>. The results demonstrate that the Pd<sup>2+</sup>-selective temperature-responsive adsorbent is effective and suitable for the recovery of Pd<sup>2+</sup> from highly acidic sources.