Korean Journal of Chemical Engineering最新文献

{"title":"Bluish-Green Light-Emitting Polymers Based on Polycarbazole Containing Benzo[b]naphtho[1,2-d]thiophene-S,S-dioxide Unit","authors":"Yuhao Zhang,&nbsp;Jin Xu,&nbsp;Wei Yang","doi":"10.1007/s11814-024-00361-5","DOIUrl":"10.1007/s11814-024-00361-5","url":null,"abstract":"<div><p>Bluish-green light-emitting polymers (PCz-NSOs) were prepared through incorporating benzo[<i>b</i>]naphtho[1,2-<i>d</i>]thiophene-<i>S,S</i>-dioxide (NSO) into the main chain of polycarbazole (PCz). PCz-NSOs exhibited exceptional thermal properties with decomposition temperatures (<i>T</i>_ds) of PCz-NSOs surpassed 430 °C. With the NSO content increases, the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels of PCz-NSOs gradually decreased, and the LUMO energy levels decreased more significantly, which indicated that the NSO unit possessed strong electronegativity. The combine of NSO and carbazole unit formed robust donor–acceptor (D–A) interaction, which caused the bathochromic-shift of emission spectra and present the bluish-green light emission. The high photoluminescence quantum yields (<i>Q</i>_PL) of PCz-NSOs were obtained with 69–82%. Even if the current density was set as 500 mA/cm², there was unchanged for electroluminescence spectrum of PCz-NSO30, exhibiting excellent spectra stability. PCz-NSO30 obtained a peak current efficiency and brightness of 5.65 cd/A and 19,061 cd/m², accompanied by CIE coordinates of (0.27, 0.53). It can be inferred that NSO held promise as an effective moiety for achieving efficient green light emission.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 2","pages":"445 - 454"},"PeriodicalIF":2.9,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficient Removal of Hg2+ from Wastewater by a Novel Cu-Modified Attapulgite: Adsorption Performance and Mechanism","authors":"Chongming Chen,&nbsp;Dong Li,&nbsp;Jinxing Yu,&nbsp;Kai Che","doi":"10.1007/s11814-024-00360-6","DOIUrl":"10.1007/s11814-024-00360-6","url":null,"abstract":"<div><p>The development of low-cost and highly efficient adsorbents is essentially needed for removing Hg²⁺ species from desulfurization sludge leaching wastewater. In this study, a series of novel Cu-modified attapulgite (Cu–ATP) adsorbents were synthesized via a simple HNO₃ treatment combined with an improved impregnation method. The Hg²⁺ removal efficiency of these Cu–ATP adsorbents was investigated in simulated leaching wastewater. The effects of HNO₃ concentration, Cu precursor, Cu-loading content, and other adsorption conditions on Hg²⁺ removal using Cu–ATP were investigated. The results demonstrated that Cu–ATP prepared with CuSO₄ as the precursor and treated with 3 mol/L HNO₃ showed excellent Hg²⁺ removal performance. Moreover, with increasing adsorbent content and adsorption time, the Hg²⁺ removal efficiency of Cu–ATP first increased and then stabilized. However, with an increase in pH value, the Hg²⁺ removal efficiency first increased and then decreased, whereas the removal showed a decreasing trend with increasing initial Hg²⁺ concentration. The adsorption kinetics results indicated that Hg²⁺ adsorption on Cu–ATP was well described by the pseudo-second-order model. Furthermore, various characterization methods, including Brunauer − Emmett − Teller analysis (BET), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), were employed to analyze the physicochemical properties of the adsorbents. The analyses confirmed that the superior Hg²⁺ removal efficiency of Cu–ATP was mainly due to the complexation of Hg²⁺ with chemisorbed oxygen produced by Cu doping and S species generated from the Cu precursor (CuSO₄). These findings underscore the potential of Cu–ATP as a cost-effective adsorbent for removing Hg²⁺ from wastewater.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 2","pages":"329 - 343"},"PeriodicalIF":2.9,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Donor Numbers for Ionic Liquids and Carbonate Solvents Using 7Li and 23Na as Probes","authors":"Uddhav Kulkarni,&nbsp;Won‑Jang Cho,&nbsp;Seunghyeon Lee,&nbsp;Dong Soo Hwang,&nbsp;TaeYeong Im,&nbsp;You Kyeong Jeong,&nbsp;Kyungho Ahn,&nbsp;Gi-Ra Yi","doi":"10.1007/s11814-024-00356-2","DOIUrl":"10.1007/s11814-024-00356-2","url":null,"abstract":"<div><p>Lithium-ion batteries (LIBs) currently dominate the commercial rechargeable battery market due to their high ionic conductivity and moderate compatibility. To enhance the development and safety of future LIBs, ionic liquids (ILs) have been introduced as additives. For the first time, we present the Lewis acid/base responses of nine ILs in terms of donor number (DN), calculated using ⁷Li NMR spectroscopy. The anionic component of the ILs significantly influences the DN through its interaction with lithium ions. In addition, the DN of three carbonate solvents was determined using both ⁷Li and ²³Na NMR spectroscopy, showing that DN of solvent is affected by the probe ion and solvent structure. These findings offer valuable insights for selecting appropriate solvents for future electrolyte development in LIBs.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 2","pages":"225 - 231"},"PeriodicalIF":2.9,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In-situ IR Study on Stability of Epoxide-Functionalized Polyethyleneimine CO2 Adsorbent to NO2 and SO2 Gases","authors":"Seong Won Pyo,&nbsp;Clinton Manianglung,&nbsp;Young Soo Ko","doi":"10.1007/s11814-024-00350-8","DOIUrl":"10.1007/s11814-024-00350-8","url":null,"abstract":"<div><p>This study investigates the stability of amine-impregnated CO₂ adsorbents, specifically polyethyleneimine (PEI) and epoxybutane-modified PEI (EB-PEI), when exposed to acidic gases like SO₂ and NO₂. Using <i>in-situ</i> FT-IR spectroscopy, the formation of degradation products such as nitro groups, NH₂–SO₂, NH₂–NO₂ complexes, and amides was identified. These degradation species were observed to form more rapidly at higher temperatures, with NO₂ causing more significant oxidation compared to SO₂. The study evaluated the impact of acid gas exposure on CO₂ adsorption performance, revealing that higher concentrations of acidic gases led to a substantial decrease in adsorption capacity. SO₂ had a more detrimental effect on the CO₂ adsorption capacity than NO₂, and EB-PEI exhibited greater resistance to SO₂ due to its higher proportion of secondary amines.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 1","pages":"179 - 193"},"PeriodicalIF":2.9,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142906001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Computation-Based Development of Carrier Materials and Catalysts for Liquid Organic Hydrogen Carrier Systems","authors":"Kiheon Sung,&nbsp;Yoojin Lee,&nbsp;Hyunwoo Yook,&nbsp;Jeong Woo Han","doi":"10.1007/s11814-024-00355-3","DOIUrl":"10.1007/s11814-024-00355-3","url":null,"abstract":"<div><p>Liquid Organic Hydrogen Carriers (LOHCs) have emerged as a promising solution for hydrogen storage, offering high hydrogen storage capacity, reversibility, thermal stability, and compatibility with existing infrastructures. Despite their potential, LOHC systems face significant challenges, including the need for specialized carriers and catalysts for efficient hydrogen storage and release. This review emphasizes the importance of computational analysis in overcoming these challenges. We summarize the computational accuracy of estimating dehydrogenation enthalpy for the carrier materials and explore molecular tuning strategies to enhance the dehydrogenation properties. In addition, we review computational studies that have investigated the impacts of catalytic adsorption/desorption and kinetic properties on the catalytic performance as well as catalyst design methods in terms of the geometry of active metal species, second metals, promoters, heterolytic hydrogen generation, and hydrogen spillover. This review further addresses the current challenges in LOHC systems, and then suggests future computational research directions to improve their efficiency and viability.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 2","pages":"195 - 223"},"PeriodicalIF":2.9,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Examining the Potential of CuO/ZnBi2O4 Heterojunction Photocathode in the Photoelectrochemical Water-Splitting Applications","authors":"Hoang Lam Nguyen,&nbsp;Nguyen Tam Nguyen Truong,&nbsp;Kwon Sang-June,&nbsp;Mohaseen S. Tamboli,&nbsp;Hamid Shaikh,&nbsp;Anesh Manjaly Poulose,&nbsp;Seung Beom Kang,&nbsp;Dong Chul Chung,&nbsp;Chang-Duk Kim,&nbsp;Jae Hak Jung","doi":"10.1007/s11814-024-00353-5","DOIUrl":"10.1007/s11814-024-00353-5","url":null,"abstract":"<div><p>The primary objective of this study is to synthesize and examine a highly efficient photo-catalyst endowed with robust and sustained photo-catalytic capabilities, with a particular focus on its applicability within photoelectrochemical (PEC) processes. The methodology employed involves the hydrothermal synthesis of CuO, subsequently subjected to a spin-coating process for the deposition of ZnBi₂O₄ (ZBO) across a multi-layer, followed by high-temperature annealing for structure optimization. A comprehensive suite of analyses encompassing morphological, structural, textual, optical, and PEC measurements was conducted on the synthesized samples. Experimental findings underscore the notable enhancement in photo-catalytic performance achieved through the formation of heterojunction, particularly conductive to facilitating the PEC hydrogen evolution reaction (HER) process when juxtaposed with the individual constituents (CuO and ZBO). Among these samples, CuO/ZBO-10 exhibited commendable photo-stability and demonstrated remarkable visible-light-induced photo-catalytic efficiency in driving the PEC HER process. The integration of ZBO coatings notably augments the PEC performance of CuO, with the CuO/ZBO-10 photocathode attaining a photo-current density of up to -1.35 mA.cm⁻² at 0 V vs. RHE, under standard test conditions. Importantly, the CuO/ZBO-10 photocathode exhibits superior retention of optical activity, with 63.11% maintained after 3600 s of irradiation, significantly surpassing the performance of bare CuO (10.98%). A detailed examination of the experimental data elucidates that the observed enhancements in photo-current density and stability can be attributed to the facilitated electrochemical charge transfer at the electrode/electrolyte interface and the concomitant mitigation of photo-corrosion rates.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 2","pages":"345 - 360"},"PeriodicalIF":2.9,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"System Design and Economic Evaluation of a Liquid Hydrogen Superstation","authors":"Duho Kang,&nbsp;Haneul Mun,&nbsp;Jinwoo Park,&nbsp;Inkyu Lee","doi":"10.1007/s11814-024-00351-7","DOIUrl":"10.1007/s11814-024-00351-7","url":null,"abstract":"<div><p>Liquid hydrogen (LH₂)-based hydrogen refueling stations (HRSs) are promising for high-capacity refueling, given the high density of LH₂, which facilitates large-scale transportation and storage. However, in LH₂ HRSs, the cryogenic cold energy of LH₂ is wasted during the vaporization process required to refuel hydrogen for fuel cell vehicles. To overcome this issue, this study proposes a novel LH₂-based hydrogen superstation (HSS) that recovers the otherwise wasted cold energy to generate electricity for the station, with any excess electricity used to charge electric vehicles. To explore the most cost-effective configuration for cold energy recovery in the HSS, two power generation cycles were designed: one incorporating a Brayton cycle followed by a Rankine cycle (BC-RC), and another using two Rankine cycles in series (RC-RC). Combining the BC-RC and RC-RC configurations, this two-stage design is adopted to efficiently recover cold energy across a broad temperature range during the vaporization process. The HSS using the BC-RC configuration achieves 53% more cold energy recovery, generates 19% more power, and experiences 8% less exergy waste compared to the HSS with the RC-RC setup. However, in smaller-scale cold energy recovery systems applied to HSS, the cost savings from using pumps instead of compressors outweigh the additional power generation benefits of the Brayton cycle. Consequently, the HSS with the RC-RC configuration demonstrates the highest economic feasibility, with a 2% higher net present value.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 2","pages":"233 - 255"},"PeriodicalIF":2.9,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improvement of Deformation Stability of Al2O3 Moisture-Barrier Layer by Insertion of 4-Bipyridine Organic Monolayers","authors":"Wooin Lee,&nbsp;Sung Min Cho","doi":"10.1007/s11814-024-00346-4","DOIUrl":"10.1007/s11814-024-00346-4","url":null,"abstract":"<div><p>Flexible organic light-emitting diode (OLED) displays are protected from external moisture using an organic–inorganic thin film encapsulation (TFE) structure. The inorganic thin films used in TFE are excellent moisture barriers, but because they are fragile, thick organic thin films must be used together. In this study, 4,4′-bipyridine (4-BP), a small organic molecule, was inserted into the Al₂O₃ inorganic thin film as monomolecular layers to improve the moisture barrier and flexibility properties of the Al₂O₃. The 30-nm-thick Al₂O₃ layer without the 4-BP monomolecular layers cracked after 1000 repeated bendings at a bending radius of 1 mm, but when these organic molecular layers were introduced, cracking occurred delayed to a radius of 0.7 mm. The effect of improving flexibility due to the introduction of these 4-BP monomolecular layers was verified through optical Ca tests before and after repeated bending and rolling. In this way, it was shown that small organic molecules such as 4-BP can be effectively used to improve the moisture barrier and flexibility properties of TFE for flexible OLED displays.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 2","pages":"393 - 401"},"PeriodicalIF":2.9,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Self-Assembled Monolayers as Hole-Selective Contacts in Inverted Perovskite Solar Cells: A Review","authors":"Huanxin Peng,&nbsp;Wenting Zheng,&nbsp;Ga-Yeong Kim,&nbsp;Jin-Wook Lee","doi":"10.1007/s11814-024-00335-7","DOIUrl":"10.1007/s11814-024-00335-7","url":null,"abstract":"<div><p>Inverted perovskite solar cells (PSCs) have gained great attention owing to their advantageous low-temperature preparation processes, high operational stability and compatibility with tandem solar cell architectures. The integration of self-assembled monolayers (SAMs) as effective hole-selective contacts in inverted PSCs has contributed to incredible advancements in device performance. In this review, we first discuss the structure and characteristics of the SAM molecules and then give an overall understanding of the bonding mechanism between SAMs and the substrate, as well as the preparation methods for SAMs. Besides, the advances of SAM-based inverted PSCs have been introduced in terms of energy band alignment and interfacial passivation and cost-effectiveness. Finally, the current issues associated with SAMs in inverted PSCs and the corresponding strategies to overcome those limitations are discussed.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"41 14","pages":"3717 - 3735"},"PeriodicalIF":2.9,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"3D CFD Analysis of Geometrical Design Impact on Hydrodynamic Performance in Hollow Fiber Membrane Contactors","authors":"Ariyan Zare Ghadi,&nbsp;Jaeseok An,&nbsp;Taeho Kim,&nbsp;Jeongho Ko,&nbsp;Choongkyun Yeom,&nbsp;Boram Gu","doi":"10.1007/s11814-024-00345-5","DOIUrl":"10.1007/s11814-024-00345-5","url":null,"abstract":"<div><p>Hollow fiber membrane contactors (HFMCs) for degasification offer several advantages, including compact design, reduced power consumption, and higher mass transfer rate compared to conventional technologies. These characteristics make HFMCs an ideal choice for applications such as ultrapure water production and wastewater treatment, where the removal of even trace amounts of dissolved gases is critical. In this study, we conducted 3D computational fluid dynamics (CFD) simulations to explore the impact of geometric features on HFMC hydrodynamic performance. A scaled-down version of a commercial module (3 M-Liqui-Cel^™) was used, preserving the actual dimensions and spacing of the hollow fiber membranes. Four different configurations were considered in the simulations based on the presence of a baffle and variations in the size and arrangement of liquid distributors. Analyses of fluid motion and pressure drop indicated that designs with larger distributors and internal baffles may reduce stagnation zones and promote more uniform flow distribution. At higher velocities, multiple recirculation areas were observed within the domain, with the size and volume of these zones varying across the different designs. These enhancements, driven by velocity fluctuations, vortex formation, and eddies, could potentially lead to higher mass transfer rates, especially at elevated flow rates. Additionally, the swirling arrangement of distributor holes in varied sizes yielded the lowest pressure drop for all flow rates studied, offering benefits in reduced energy consumption and increased operational efficiency. Our simulation results highlight the potential of optimized distributor hole sizes and patterns to enhance flow mixing and minimize pressure drop.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 2","pages":"271 - 289"},"PeriodicalIF":2.9,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}