@article{park_yoo_cho_park_cruz_kelley_park_2024, title={Exploring potential of cellulose acetate sulfate films for sustainable packaging: tuning characteristics via sulfate group variation}, volume={1}, ISSN={["1572-882X"]}, DOI={10.1007/s10570-023-05713-8}, journal={CELLULOSE}, author={Park, Seonghyun and Yoo, Seunghyun and Cho, Seong-Min and Park, Hyeonji and Cruz, David and Kelley, Stephen S. and Park, Sunkyu}, year={2024}, month={Jan} }
 @article{dulger_yuan_singh_omolabake_czarnecki_nikafshar_li_becsy-jakab_park_park_et al._2024, title={Scale-Up of a Two-Stage Cu-Catalyzed Alkaline-Oxidative Pretreatment of Hybrid Poplar}, volume={3}, ISSN={["1520-5045"]}, DOI={10.1021/acs.iecr.3c04466}, abstractNote={A two-stage alkaline-oxidative pretreatment of hybrid poplar was investigated at scale (20 L reactor volume) with the goal of understanding how reaction conditions as well as interstage mechanical refining impact downstream process responses. The pretreatment comprises a first stage of alkaline delignification (alkaline pre-extraction) followed by a second delignification stage employing Cu-catalyzed alkaline hydrogen peroxide with supplemental O2 (O2-enhanced Cu-AHP). Increasing pre-extraction severity (i.e., temperature and alkali loading) and pretreatment oxidation (increasing H2O2 loading) were found to increase mass and lignin solubilization in each stage. Lignin recovered from the first stage was subjected to oxidative depolymerization and led to aromatic monomer yields as high as 23.0% by mass. Lignins recovered from the second-stage Cu-AHP pretreatment liquors were shown to exhibit aliphatic hydroxyl contents more than 6-fold higher than a typical hardwood kraft lignin, indicating that these lignins could serve as a biobased polyol for a range of polyurethane applications.}, journal={INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH}, author={Dulger, Dilara N. and Yuan, Zhaoyang and Singh, Sandip K. and Omolabake, Surajudeen and Czarnecki, Celeste R. and Nikafshar, Saeid and Li, Mingfei and Becsy-Jakab, Villo E. and Park, Seonghyun and Park, Sunkyu and et al.}, year={2024}, month={Mar} }
 @article{park_rahmani_treasure_lee_tiller_pasquinelli_kelley_park_2024, title={Understanding the formation of insoluble gel particles during cellulose diacetate production}, volume={2}, ISSN={["1572-882X"]}, url={http://dx.doi.org/10.1007/s10570-024-05769-0}, DOI={10.1007/s10570-024-05769-0}, journal={CELLULOSE}, author={Park, Seonghyun and Rahmani, Farzin and Treasure, Trevor and Lee, Joo and Tiller, Phoenix and Pasquinelli, Melissa A. and Kelley, Stephen S. and Park, Sunkyu}, year={2024}, month={Feb} }
 @article{molina_park_park_kelley_2023, title={Effective toluene removal from aqueous solutions using fast pyrolysis-derived activated carbon from agricultural and forest residues: Isotherms and kinetics study}, volume={9}, ISSN={["2405-8440"]}, url={https://doi.org/10.1016/j.heliyon.2023.e15765}, DOI={10.1016/j.heliyon.2023.e15765}, abstractNote={In this study, the production and characterization of activated carbons (ACs) from agricultural and forest residue using physical activation are discussed. Biomass-based biochars produced during fast pyrolysis process is introduced as alternative precursors to produce AC and the integrated process for the co-production of porous adsorbent materials from biochar via the fast pyrolysis process is suggested. Moderate surface areas and good adsorption capacities were obtained from switchgrass (SWG) and pine tops (PT) based AC. The surface areas were 959 and 714 m2/g for SWG- and PT-based AC, respectively. The adsorption capacities using toluene as pollutant for two model systems of 180 and 300 ppm were measured and ranged between 441-711 and 432-716 mg/g for SWG-based and PT-based AC, respectively. The nitrogen adsorptive behavior, Lagergren pseudo-second-order kinetic (PSOK) model and kinetics isotherms studies describe a heterogeneous porous system, including a mesoporous fraction with the existence of a multilayer adsorption performance. The presence of micropores and mesopores in SWG- and PT-based AC suggests potential commercial applications for using pyrolytic biochars for AC production.}, number={5}, journal={HELIYON}, author={Molina, Eliezer A. Reyes and Park, Seonghyun and Park, Sunkyu and Kelley, Stephen S.}, year={2023}, month={May} }
 @article{park_yoo_cho_kelley_park_2023, title={Production of single-component cellulose-based hydrogel and its utilization as adsorbent for aqueous contaminants}, volume={243}, ISSN={["1879-0003"]}, DOI={10.1016/j.ijbiomac.2023.125085}, abstractNote={The growing concern for the environment has resulted in renewed interest in bio-based resources. This study aims to produce a hydrogel adsorbent from cellulose and examine its adsorption performance. In pursuit of this goal, we report a simple one-pot synthesis of cellulose acetate sulfate (CAS), followed by the formation of CAS hydrogels and their subsequent adsorption performances. The CAS includes both hydrophilic and hydrophobic functional groups, enable the formation of a single-component hydrogel through intermolecular interactions in deionized water. The thermal reversibility of CAS hydrogels makes them easily processable into various shapes. The durability of the CAS hydrogel adsorbents can be improved by introducing divalent cations (e.g., Ca2+), which create ionically crosslinked hydrogels. The ionically a crosslinked CAS hydrogel adsorbent exhibits a maximum adsorption capacity of 245 mg/g for methylene blue (MB) at 23 °C and a pH of 7. The adsorption behavior of MB on the CAS hydrogel follows both the pseudo-second-order model and the Langmuir adsorption isotherm model. Furthermore, the CAS hydrogel adsorbent maintains a 70 % removal ratio after five cycles. The simplicity of synthesis and hydrogel formation opens up new possibilities for producing and utilizing cellulose-based hydrogels as adsorbents for aqueous contaminants.}, journal={INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES}, author={Park, Seonghyun and Yoo, Seunghyun and Cho, Seong-Min and Kelley, Stephen S. and Park, Sunkyu}, year={2023}, month={Jul} }
 @article{zeng_jang_park_park_kan_2021, title={Effects of Mechanical Refining on Anaerobic Digestion of Dairy Manure}, volume={6}, ISSN={["2470-1343"]}, DOI={10.1021/acsomega.1c01760}, abstractNote={Mechanical refining (MR) is a cost-effective pretreatment in biochemical conversion processes that is employed to overcome biomass recalcitrance. This work studied the effects of MR on biogas and methane produced by the anaerobic digestion (AD) of dairy manure. The cumulative gas volume and yield from the AD of manure refined at 6k revolutions increased by 33.7 and 7.7% for methane and by 32.0 and 6.4% for biogas, respectively, compared to the unrefined manure. This enhancement was reached by increasing manure solubilization, reducing particle size, and achieving external fibrillation and internal delamination of fibers in manure. However, the highly refined manure (subjected to 60k revolutions) exhibited methane and biogas yields that were reduced by 9.5 and 1.5%, respectively. This decrease was observed because the pore structure was ruptured, and finely ground manure particles were aggregated together at high revolutions (60k), thereby inhibiting the release of organic matter from the manure. Therefore, this study indicates that the MR for pretreatment of dairy manure could have great potential for significantly enhancing AD of dairy manure. Further studies will include optimization of conditions of mechanical refining (i.e., mechanical intensity, process time), a continuous AD of dairy manure pretreated by the MR, and scale-up with cost evaluation.}, number={26}, journal={ACS OMEGA}, author={Zeng, Shengquan and Jang, Hyun Min and Park, Seonghyun and Park, Sunkyu and Kan, Eunsung}, year={2021}, month={Jul}, pages={16934–16942} }