Chemical Engineering Journal Advances最新文献

{"title":"Green synthesis of chitosan-functionalized silver nanoparticles using non-thermal plasma as biocompatible antimicrobials against multidrug-resistant pathogens","authors":"Tirtha Raj Acharya ,&nbsp;Manorma Negi ,&nbsp;Prajwal Lamichhane ,&nbsp;Apurva Jaiswal ,&nbsp;Oat Bahadur Dhakal ,&nbsp;Sandhya Gautam ,&nbsp;JunYoung Park ,&nbsp;Rizwan Wahab ,&nbsp;Abdulaziz A. Al-Khedhairy ,&nbsp;Neha Kaushik ,&nbsp;Eun Ha Choi ,&nbsp;Nagendra Kumar Kaushik","doi":"10.1016/j.ceja.2025.101010","DOIUrl":"10.1016/j.ceja.2025.101010","url":null,"abstract":"<div><div>Antimicrobial resistance (AMR) demands alternative strategies to overcome the restrictions of conventional antibiotics. This study reports the green synthesis of chitosan-functionalized silver nanoparticles (CS-AgNPs) in a one-step process at room temperature by employing a non-thermal plasma (NTP) process in an aqueous phase without using any hazardous reducing agent. Ar/H₂ plasma generated highly reactive species, thus enabling rapid Ag⁺ reduction and simultaneously acting as a chitosan capping agent to produce crystalline, monodisperse nanoparticles. FTIR, Raman, XPS, and TEM analyses confirmed strong chitosan coordination (Ag–N, Ag–O) and uniform elemental distribution. CS-AgNPs displayed dose-dependent antibacterial activity against multidrug-resistant <em>Escherichia coli, Salmonella enterica</em>, and <em>Streptococcus mutans</em>, inhibiting their growth in the concentration range 2.34–4.69 µg/mL and reducing their colony-forming unit (CFU) count to a maximum of 1 log unit at 75 µg/mL. Cytotoxicity tests revealed that CS-AgNPs do not have any detrimental effects on RAW 264.7 and HT-29 cells at 37.5 µg/mL. CS-AgNPs inhibited the virulence genes SPI-1 and SPI-2 of Salmonella enterica, hence reducing its adhesion, invasion, and survival inside cells. These results pointed out that CS-AgNPs study in a two-step mode of action, with direct bactericidal activity and suppression of bacterial virulence, while keeping the viability of host cells intact. In conclusion, the NTP synthesized CS-AgNPs provides a biocompatible, effective, and sustainable platform to address the growing threat caused by AMR pathogens, with further applications in infection control and biomedical devices.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"25 ","pages":"Article 101010"},"PeriodicalIF":7.1,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145938913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sustainable removal of methylene blue using minimally modified hydrochar from durian peels with experimental adsorption and density functional theory studies","authors":"Piangjai Peerakiatkhajohn ,&nbsp;Praewa Wongburi ,&nbsp;Kamonwat Nakason ,&nbsp;Bunyarit Panyapinyopol ,&nbsp;Khanin Nueangnoraj ,&nbsp;Phongphot Sakulaue ,&nbsp;Davide Poggio ,&nbsp;William Nimmo ,&nbsp;Jakkapon Phanthuwongpakdee","doi":"10.1016/j.ceja.2025.101011","DOIUrl":"10.1016/j.ceja.2025.101011","url":null,"abstract":"<div><div>This study investigated the use of hydrochar (HC) derived from durian peels as an adsorbent for removing methylene blue (MB) from an aqueous environment. HC was synthesized from durian peels using hydrothermal carbonization under varying temperature (160 – 200 °C) and time (2 – 6 h) conditions. The optimal condition 180 °C for 2 h (HC-180–2) was identified. HC-180–2 was evaluated in MB adsorption experiments and adsorbent characterization. It achieved a maximum MB adsorption capacity (<em>q</em>) of 51.6 mg/g at room temperature, reaching equilibrium within 150 min, and the <em>q</em> value increased to 59.2 mg/g at 65 °C. The adsorption followed pseudo-second-order kinetics (R² = 0.996) and Langmuir isothermal behavior (R² = 0.996), indicating chemisorption on energetically uniform adsorption sites. Thermodynamic analysis yielded Gibbs free energy values ranging from -43.0 to -55.3 kJ/mol and an enthalpy change of 48.5 kJ/mol, which further confirmed the spontaneous and endothermic nature of the chemisorption process. The surface area of HC-180–2 increased from 3.04 to 6.36 m²/g compared to the biomass, confirming the chemisorption and dependence on chemical functionality rather than physical surface area. Structural characterizations revealed enhanced aromatization and functional group formation, including sulfone and ester groups. Density functional theory calculations revealed two possible HC-MB conformation with adsorption mechanisms involving hydrogen bonding, π-π stacking and π-sulfur interactions. The chemisorption nature was also confirmed through Quantum Theory of Atoms in Molecules electron density pathway analysis. While the adsorption capacity was moderate compared to chemically modified adsorbents, the minimally processed durian peels HC positioned itself as a promising green alternative for MB removal.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"25 ","pages":"Article 101011"},"PeriodicalIF":7.1,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145938915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of aerobic micro granular sludge in a sequencing batch airlift reactor for simultaneous removal of COD, NH4+, PO43-, and SO42-","authors":"Kunnath Saidalavi Shameem ,&nbsp;Pothanamkandathil Chacko Sabumon","doi":"10.1016/j.ceja.2025.101006","DOIUrl":"10.1016/j.ceja.2025.101006","url":null,"abstract":"<div><div>This study investigates the long-term effectiveness of an automated Sequencing Batch Airlift Reactor (SBAR) in simultaneous removal of COD, NH₄⁺, PO₄³, and SO₄²⁻ by developing aerobic micro granular sludge. For this an automated SBAR (3 L capacity) with pH and DO controls, operated for 8 h (short) followed by 16 h (long) cycles; was employed using synthetic wastewater over a year. This study operated in six different phases with durations of 23, 27, 73, 125, 67, and 52 days, respectively within a temperature range of 31.5 ± 3.5 °C. During the entire phases, influent concentrations were maintained approximately at NH₄⁺-<em>N</em> = 50 mg/L, COD = 480 mg/L, and SO₄²⁻-<em>S</em> = 35 mg/L, while PO₄³⁻-P was maintained at 10 mg/L for Phases I–IV and then decreased to 5 mg/L for Phases V–VI. Sludge was not wasted during the entire operation from SBAR and thus maintained a very high solids retention time (SRT) to promote the growth of slow growing bacteria like anammox and achieved zero sludge discharge. In the stabilized conditions in the final phase, the SBAR performed well for an average simultaneous removal of COD (96.67 ± 1.17%), NH₄⁺-N (91.70 ± 3.66%), TN (83.21 ± 3.61%), PO₄³⁻-P (91.37 ± 1.55%) and SO₄²⁻-S (70.73 ± 4.13%). Batch studies and microbial identification studies carried out using biomass drawn from SBAR showed that mixed culture involving anammox, autotrophic nitrification, heterotrophic denitrification, thiobacillus denitrification, and heterotrophic nitrification and aerobic denitrification (HN-AD) played significant roles in nitrogen removal. Enhanced phosphate removal was achieved by P binding to loosely bound extracellular polymeric substances in addition to the enhanced biological phosphorus removal. Overall, these findings highlight the effectiveness in cultivating majorly aerobic micro granular sludge and sustainability of the SBAR in simultaneous removal of COD, NH₄⁺, PO₄³⁻, and SO₄²⁻. The developed process could be a good choice for decentralized wastewater treatment systems, particularly in resource-constrained regions and contributes to achieving United Nations Sustainable Development Goal #6.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"25 ","pages":"Article 101006"},"PeriodicalIF":7.1,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145938847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental modeling and optimization of CO2 absorption into MDEA-sulfolane solution using RSM and ANNs","authors":"Abolfazl Shokri,&nbsp;Faezeh Mirshafiee,&nbsp;Ahad Ghaemi","doi":"10.1016/j.ceja.2025.101009","DOIUrl":"10.1016/j.ceja.2025.101009","url":null,"abstract":"<div><div>This research studies the modelling and optimization of CO₂ absorption in a mixed MDEA-Sulfolane solvent system using response surface methodology (RSM), multilayer perceptron (MLP), and radial basis function (RBF) approaches. Experimental data from a stirred reactor were collected with five input parameters, including temperature in the range of 20–70 °C, pressure in the range of 2–8 bar, sulfolane concentration in the range of 10–20 mol/L, MDEA concentration in the range of 10–20 mol/L, and time in the range of 60–3600 s. Two main output responses, CO₂ loading in the range of 0.0094–0.3627 and mass transfer flux of 0.00023–0.00782 mol/m².s, were examined. The modeling results showed that the MLP network provided the highest predictive accuracy, with K-fold-validated R² values of 0.9999 for CO₂ loading and 0.9863 for mass-transfer flux, outperforming both the RBF model (R² ≈ 0.9993–0.9885) and RSM (R² ≈ 0.9800–0.9563). The optimal MLP structure used 55 neurons, selected through systematic evaluation to prevent overfitting. Optimization using RSM and ANN–GA produced closely matching results. For the flux-optimum, both methods identified the same operating point (24.77 °C, 7.995 bar, 19.98 mol L⁻¹ sulfolane, 19.998 mol L⁻¹ MDEA, 60.01 s), with predicted fluxes of 0.0090 (RSM) and 0.0089 mol m⁻² s⁻¹ (MLP–GA). For the loading-optimum (at 20 °C, 8 bar, 10 mol L⁻¹ sulfolane, 13.30 mol L⁻¹ MDEA, 3552 s), RSM predicted 0.4510, while MLP–GA predicted 0.4301, corresponding to a small deviation of 4.63 %. Overall, the strong consistency between RSM and ANN–GA confirms the reliability of the ANN framework for predicting and optimizing CO₂ absorption performance in hybrid solvent systems.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"25 ","pages":"Article 101009"},"PeriodicalIF":7.1,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145938750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental and kinetic insights into enzymatic synthesis of phosphatidylglycerol in an oscillatory baffled reactor","authors":"Jianyu Wang ,&nbsp;Rachel A. Scullion ,&nbsp;James Birbeck ,&nbsp;Xiongwei Ni","doi":"10.1016/j.ceja.2025.101004","DOIUrl":"10.1016/j.ceja.2025.101004","url":null,"abstract":"<div><div>Phosphatidylglycerol (PG) is a valuable product across pharmaceuticals, cosmetics and food industries, the conventional phospholipase D (PLD) syntheses however require organic solvents and very long reaction times to reach 50–74 % yield at millilitre scale. The novelty of this study is that we have developed a solvent-free, fully aqueous synthesis route of PG using PLD-catalysed transphosphatidylation of phosphatidylcholine (PC) with glycerol in a 250 mL oscillatory baffled reactor (OBR). By optimising temperature, PLD concentration, glycerol-to-PC ratio and mixing, we achieved 63.5 % PG conversion within 20 min with no detectable byproduct. Time-resolved kinetic analysis has revealed a three-phase mechanism in this reaction: an initial Michaelis–Menten behaviour, followed by product inhibition and eventual enzyme deactivation. We have then developed a multi-parameter kinetic model integrating intrinsic enzyme kinetics with operational variables, enabling quantitative predictions of reaction concentration, conversion and selectivity at high confidence level (R2&gt;0.95). Coupling the green, solvent-free process with reactor intensification and mechanistic modelling establishes a scalable framework for PG manufacture and offers regulatory and sustainability advantages by avoiding volatile organic solvents and simplifying downstream processing.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"25 ","pages":"Article 101004"},"PeriodicalIF":7.1,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145938843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling the Effectiveness of Chemical Reactions in Magnetized Nanofluids: The Influence of Activation Energy and CattaneoChristov Transport Phenomena","authors":"Saleem Nasir ,&nbsp;Abdallah S. Berrouk ,&nbsp;Asim Aamir","doi":"10.1016/j.ceja.2025.101005","DOIUrl":"10.1016/j.ceja.2025.101005","url":null,"abstract":"<div><div>The remarkable capacity of artificial neural networks to simulate complex and nonlinear mathematical phenomena, particularly in domains such as thermal engineering and nanotechnology, is a primary reason for their widespread application. Thus, ANNs provide a flexible computational framework that can be applied in a wide range of fields, including fluid mechanics, biological sciences, and computational biology. In this work, the boundary-layer flow and heat transfer properties of a magnetized Powell-Eyring nanofluid containing microorganisms across a bidirectional stretchable sheet are analyzed using a computational ANN paradigm. The model considers the combined effects of Darcy-Forchheimer, thermal radiation, and internal heat generation, as well as modified CattaneoChristov heat and mass flux, magnetohydrodynamics (MHD), and activation energy. The governing system of equations is reduced to a set of nonlinear ordinary differential equations through a similarity transformation. The BVP4C solver in MATLAB is then used to numerically solve the ODEs. An Artificial Neural Network Backpropagation Levenberg–Marquardt technique (ANN-BPLMT) customized for the radiative Powell-Eyring nanofluid system is trained using the resultant numerical solutions as a reference dataset. The numerical solutions are then approximated under various parametric settings by training, testing, and validating the LMT-ABPNN. Performance indicators, including mean squared error, fitness curves, error histograms, and statistical transition analyses, are used to validate models. The results reveal that the numerical reference data and the ANN predictions correspond extremely well. The high accuracy, robustness, and predictive reliability of the suggested LMT-ABPNN framework for simulating radiative Powell-Eyring nanofluid flows are confirmed by the low MSE and minimal absolute error, both of which approach zero.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"25 ","pages":"Article 101005"},"PeriodicalIF":7.1,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Chiral phosphonium ion-pairing catalysis: From structural innovation to asymmetric synthesis","authors":"Wenchao Chen ,&nbsp;Jia Zhi ,&nbsp;Xiaoying Jiang,&nbsp;Renren Bai","doi":"10.1016/j.ceja.2025.101002","DOIUrl":"10.1016/j.ceja.2025.101002","url":null,"abstract":"<div><div>Chiral phosphonium salt catalysis has emerged as a crucial component of asymmetric ion-pairing catalysis, demonstrating growing significance in the field of asymmetric catalytic synthesis. With the unique structural features and outstanding catalytic properties, chiral phosphonium salts can excel in a wide variety of asymmetric reactions, exhibiting excellent catalytic performance and remarkable stereocontrol. Researchers have successfully developed various types of chiral phosphonium salt catalysts, including 1,1′-binaphthyl-based phosphonium salts, chiral diamine-derived P-spirotetraaminophosphonium salts, amino acid-derived bifunctional phosphonium salts, and peptide-based multifunctional phosphonium salts. This review comprehensively surveys two decades of advances in chiral phosphonium ion-pairing catalysis, encompassing the rational design strategies, synthetic approaches, wide-ranging utility in various asymmetric reactions, as well as practical applications in the construction of diverse chiral skeletons. Meanwhile, we delve into the catalytic mechanisms in multiple asymmetric reactions. Drawing upon a thorough synthesis of the present landscape, we additionally present a forward-looking perspective on the trajectory of this field’s future development. The ultimate goal is to spark innovative research endeavors, promote the creation of chiral phosphonium salts with novel skeletal frameworks, and the development of new catalytic systems, thereby further advancing the widespread application and vigorous development of chiral phosphonium ion-pairing catalysis.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"25 ","pages":"Article 101002"},"PeriodicalIF":7.1,"publicationDate":"2025-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi-mechanistic adsorption of pharmaceuticals and personal care products on oxidized microplastics: Oxidation processes, mechanisms, and environmental implications","authors":"Dale Jason Panio Gamorot,&nbsp;Angelo Earvin Sy Choi","doi":"10.1016/j.ceja.2025.101000","DOIUrl":"10.1016/j.ceja.2025.101000","url":null,"abstract":"<div><div>Microplastics (MPs) have emerged as significant environmental pollutants, raising concerns due to their persistence, widespread distribution, and potential impacts on ecological and human health. Oxidation processes increase the sorptive capacity of MPs by adding oxygen-containing functional groups and creating rougher, more reactive surfaces. This review focuses on how these oxidation-induced changes modify the adsorption of pharmaceuticals and personal care products (PPCPs). Oxidized MPs exhibit altered surface polarity and charge, strengthening key interactions such as hydrophobic partitioning, hydrogen bonding, and electrostatic attraction. Environmental conditions, including pH, salinity, and the degree of aging, further influence these mechanisms. Hydrophilic PPCPs generally show stronger affinity for oxidized MPs because their functional groups interact more effectively with the modified surfaces. Variations in pH and salinity can reduce sorption by shifting surface charge and disrupting electrostatic forces. This review demonstrates that oxidation-driven surface transformations are central to understanding how MPs adsorb, transport, and potentially release PPCPs in aquatic environments, shaping their environmental behavior and associated risks.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"25 ","pages":"Article 101000"},"PeriodicalIF":7.1,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145938844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adsorption of Mn2+, Co2+, and Ni2+ in MOF-808 and pyrazole-modified MOF-808: Selectivity trends assessed with microcalorimetry and spectroscopic analysis","authors":"Boyoung Song ,&nbsp;Nadine Kabengi ,&nbsp;Jackson Geary ,&nbsp;Dorina F. Sava Gallis ,&nbsp;Kevin Leung ,&nbsp;Anastasia G. Ilgen","doi":"10.1016/j.ceja.2025.101003","DOIUrl":"10.1016/j.ceja.2025.101003","url":null,"abstract":"<div><div>Zirconium(IV)-based metal-organic framework (MOF) MOF-808 and pyrazole-functionalized MOF-808 were investigated for the selective adsorption of Mn²⁺, Co²⁺, and Ni²⁺, the key components of lithium-ion battery cathodes. Batch adsorption experiments were conducted to assess selectivity for each metal, while flow microcalorimetry was employed to assess thermodynamic signatures of adsorption. To understand molecular interactions between the MOFs and adsorbing metal ions we utilized attenuated total reflectance Fourier transform infrared (ATR-FTIR) and Ni K-edge extended X-ray absorption fine structure (EXAFS) spectroscopic analyses. For MOF-808, the adsorption followed Mn²⁺ &gt; Co²⁺ ≈ Ni²⁺trend, following the changes in hydration energy of the examined ions. Pyrazole functionalization altered this trend by increasing the affinity of MOF-808-pyrazole for Ni only, while resulting in similar affinity for the other two ions (Ni²⁺ &gt; Mn²⁺ &gt; Co²⁺). Microcalorimetry revealed that Mn²⁺ adsorption on both MOFs was exothermic, whereas Co²⁺ and Ni²⁺ adsorption was endothermic. Importantly, ATR-FTIR spectra showed peak growth and vibrational band shifts assigned to direct interactions of Co²⁺ and Ni²⁺ with pyrazole groups, indicating that Ni²⁺ coordinates to N in pyrazole. Additionally, the shell-by-shell fitting of EXAFS data also indicated that some Ni²⁺ adsorption took place at the Zr oxo-cluster sites. These results demonstrate that metal adsorption by MOF-808 and MOF-808-pyrazole is metal-specific, governed by both hydration energy and the electrostatic interactions described by the Irving-Williams series. Importantly, pyrazole functionalization enables selective Ni²⁺ capture, offering new insights into ligand design within MOFs for target element separation from mixed aqueous systems.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"25 ","pages":"Article 101003"},"PeriodicalIF":7.1,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Manganese enriched zeolitic imidazole framework-67 and doped reduced graphene oxide hybrid electrocatalyst applied in alkaline Zn-air battery","authors":"S. Fajardo ,&nbsp;C.M. Sánchez-Sánchez ,&nbsp;P. Ocón ,&nbsp;J.L. Rodríguez ,&nbsp;E. Pastor","doi":"10.1016/j.ceja.2025.100999","DOIUrl":"10.1016/j.ceja.2025.100999","url":null,"abstract":"<div><div>The development of durable, low-cost electrocatalysts for the oxygen reduction reaction (ORR) is crucial to the advancement of Zn–air batteries. Here different zeolitic imidazolium framework (ZIF-67)-based hybrid electrocatalysts supported on reduced graphene oxide (rGO) are evaluated (ZIF/rGO, ZIF/SN-rGO, and MnZIF/SN-rGO) for the ORR in alkaline media and gel Zn–air batteries. A key feature of this work is the application of pumped-micropipette delivery/substrate-collection (pumped-MD/SC) mode of scanning electrochemical microscopy (SECM) in alkaline electrolyte, a mode rarely explored and, to the best of our knowledge, not previously reported for ORR mapping under these conditions. Pumped-MD/SC SECM current maps unambiguously identify MnZIF/SN-rGO as the most active electrocatalytic material, showing the lowest overpotential, as well as exhibiting the highest limiting current and negligible H₂O₂ yield evaluated by rotating ring-disc electrode (RRDE). The catalyst retains its activity after 1000 potential cycles under ORR conditions, evidencing excellent durability. When implemented as the air-cathode in a non-rechargeable gel Zn–air battery, MnZIF/SN-rGO delivers a specific capacity of 803 mAh g^-¹_Zn and a specific energy of 1119 mWh g^-¹_Zn, sustaining a stable discharge &gt; 1.4 V for 32 h at 10 mA cm^-². These metrics surpass most gel-electrolyte Zn–air batteries reported under comparable conditions, highlighting the practical relevance of the catalyst. The combined SECM–battery approach links spatially resolved ORR activity with device-level performance, providing mechanistic insight and a robust benchmark for future cathode design. Overall, MnZIF/SN-rGO emerges as a highly durable and efficient cathode for gel Zn–air batteries.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"25 ","pages":"Article 100999"},"PeriodicalIF":7.1,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145938919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}