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Thermal reduction of graphene oxide via high-temperature annealing in a CH4 and CO reducing atmosphere

Materials Today Communications 2025年 46卷

作者： Racki, Adrian Romanowska, Agata Banasiak, Aleksandra Baran, Magdalena Marynowicz, Stefan Chlanda, Adrian Warsaw University of Technology Faculty of Chemistry ul. Noakowskiego 3 Warsaw00-664 Poland Institute of Microelectronics and Photonics Flake Graphene Research Group Al. Lotników 32/46 Warsaw02-668 Poland Warsaw University of Technology Faculty of Chemical and Process Engineering ul. Waryńskiego 1 Warsaw00-645 Poland AGH University of Krakow Faculty of Energy and Fuels Al. Mickiewicza 30 Cracow30-059 Poland

In this study, we investigate the thermal reduction of graphene oxide using high-temperature annealing in various gas atmospheres: Argon, 10% CO in Argon, and 10% CH4 in Argon. Graphene oxide was synthesized, chemically pre-reduced, and dried before undergoing reduction in these controlled atmospheres. To evaluate the impact of different gases on the reduction process, we conducted a series of characterizations, including combustion analysis for C/O ratio, Raman spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, Brunauer–Emmett–Teller surface area measurements, and electrical conductivity testing. The results demonstrated that the presence of methane during annealing notably increased the reduction rate and induced other changes in the material properties, whereas the use of CO had no significant impact on the final material. © 2025 Elsevier Ltd

关键词： Annealing

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Measurement and evaluation of anisotropic thermophysical parameters of lithium-ion battery electrode stack: An experimental and numerical study

Next Energy

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Next Energy 2025年 8卷

作者： Muhammad Wasim Tahir Muhammad Yousaf Arshad Huma Hussain Nam Nghiep Tran Anam Suhail Ahmad Institute of Chemical Process Engineering University of Stuttgart Stuttgart 70199 Germany Department of Chemical Engineering University of Engineering and Technology Lahore 54890 Pakistan School of Chemical Engineering Faculty of Sciences Engineering and Technology The University of Adelaide South Australia 5007 Australia Halliburton Worldwide Houston TX 77032-3219 USA

The development of advanced electrode materials and their complex formulations has made it increasingly difficult to obtain accurate thermophysical parameters of the active zone in lithium-ion cells. These parameters, such as thermal conductivity and specific heat capacity, are crucial for optimizing the performance and safety of the battery. Conventional methods for obtaining these measurements often require expensive and sophisticated laboratory equipment, which limits accessibility and ease of use. An innovative hybrid approach is presented for measuring the thermophysical parameters of the active zone in lithium-ion batteries. This method combines experimental measurements with numerical simulations to determine anisotropic thermal conductivity, specific heat capacity, and the density of the electrode stack. A key aspect of this approach is the use of low-viscosity liquid paraffin to simulate the effects of the electrolyte. The through-plane and in-plane thermal conductivities of both wetted and dry specimens are measured, while the specific heat capacity is approximated numerically. This simple, cost-effective technique eliminates the need for specialized and expensive lab equipment. The through-plane thermal conductivity of the wetted specimen was found to be 2 orders of magnitude greater than that of the dry specimen, while the difference between the in-plane thermal conductivities of the wetted and dry specimens was negligible. The errors in the measured values of through-plane and in-plane thermal conductivities were approximately 4% and 2%, respectively, while the numerically approximated specific heat capacity showed an error of around 2.5%. All measured parameters were found to be within reported ranges. A 3D lumped thermal model incorporating the measured thermophysical parameters was simulated using the commercial software ANSYS Fluent to examine the effects of thermal anisotropy. The simulation results were validated against experimental data and were

关键词： Lithium-ion battery Thermal modeling Thermophysical parameters ANSYS Fluent

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Investigation of droplet breakup in liquid–liquid dispersions by CFD–PBM simulations：The influence of the surfactant type

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Chinese Journal of chemical engineering 2017年第10期25卷 1369-1380页

作者： Dongyue Li Antonio Buffo Wioletta Podgórska Daniele L.Marchisio Zhengming Gao State Key Laboratory of Chemical Resource Engineering School of Chemical Engineering Beijing University of Chemical Technology Beijing 100029 China Aalto University Department of Biotechnology and Chemical Technology Espoo Finland Faculty of Chemical and Process Engineering Warsaw University of Technology Warsaw Poland Institute of Chemical Engineeriag Department of Applied Science and Technology Politecnico di Torino Torino Italy

The accurate prediction of the droplet size distribution(DSD)in liquid–liquid turbulent dispersions is of fundamental importance in many industrial applications and it requires suitable kernels in the population balance *** a surfactant is included in liquid–liquid dispersions,the droplet breakup behavior will change as an effect of the reduction of the interfacial ***,also the dynamic interfacial tension may be different with respect to the static,due to the fact that the surfactant may be easily desorbed from the droplet surface,generating additional disruptive *** this work,the performance of five breakup kernels from the literature is assessed,to investigate their ability to predict the time evolution of the DSD and of the mean Sauter diameter,when different surfactants are *** are performed with the Quadrature Method of Moments for the solution of the population balance model coupled with the two-fluid model implemented in the compressible Two Phase Euler Foam solver of the open-source computational fluid dynamics(CFD)code Open FOAM *** time evolution of the mean Sauter diameter predicted by these kernels is validated against experimental data for six test cases referring to a stirred tank with different types of surfactants(Tween 20 and PVA 88%)at different concentrations operating under different stirrer *** results show that for the dispersion containing Tween 20 additional stress is generated,the multifractal breakup kernel properly predicts the DSD evolution,whereas two other kernels predict too fast breakup of droplets covered by adsorbed *** derived originally for bubbles completely fail.

关键词： Breakup Stirred tank Liquid–liquid dispersions Interfacial tension CFD–PBM

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APPLICATION OF A SINGLE-BUBBLE MODEL IN ESTIMATION OF OZONE TRANSFER EFFICIENCY IN WATER

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OZONE-SCIENCE & engineering 1995年第5期17卷 469-484页

作者： BIN, AK Faculty of Chemical and Process Engineering Warsaw University of Technology Warszawa 00645 ul. Waryńskiego 1 Poland

A single-bubble model of mass transfer in gas-liquid systems enables the estimation of transfer efficiencies under different process conditions. In particular, it can be applied to simulate the effects of bubble size, value of the mass transfer coefficient, kinetics of reactions taking place in water and depth of the contact chamber. The results of such modelling in terms of transfer efficiency are presented for physical and chemical absorption of ozone in water at different hydrodynamic conditions (bubble size, water temperature, water depth in the contact chamber, and initial ozone concentration in the bubbles). The results of computations are compared with some reference data on ozone absorption in water in industrial-scale contact chambers.

关键词： OZONE MASS TRANSFER SINGLE-BUBBLE MODEL OZONE TRANSFER EFFICIENCY IN WATER

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Energy optimization in process systems / 1st ed.

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2009年

作者： Sieniutycz Stanislaw.

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Flux and permeation behaviour of ultrafiltration in sugaring out cellulose hydrolysate solution: A membrane screening

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Journal of Physical Science 2017年 28卷 25-38页

作者： Zain, Masniroszaime Md Mohammad, Abdul Wahab Hairom, Nur Hanis Hayati Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Selangor Malaysia Department of Chemical Engineering Technology Faculty of Engineering Technology Universiti Tun Hussein Onn Malaysia Johor Malaysia

Cellulose hydrolysate ultrafiltration was investigated as in-situ separation of glucose while limiting the consumption of enzyme. Thus the high permeation of glucose through the membrane is one of the main criteria required in designing an efficient membrane reactor system. The performances of three commercial UF membranes (PES20, PA3 and PSF20) were compared in a stirred batch cell. Special attention was directed to the permeation of glucose and retention of enzyme of the cellulose hydrolysate. The effects of solution pHs and the presence of lignin on membrane fouling were evaluated. The results revealed that significant flux decline was obtained for PES20 and PSF20 membrane (44% decline), but slight flux decline occurred for PA3 membrane (13% decline). The permeation of glucose up to 90% was found to be higher for PA membrane. To mitigate fouling, it is appropriate to increase the negatively charge of the membrane surface through rising up the pH solution from the isoelectric point (IEP) of cellulose hydrolysate. © Penerbit Universiti Sains Malaysia, 2017.

关键词： Cellulose

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Fabrication of graphene oxide decorated with poly(dimethyl amino ethyl methacrylate) brush for efficient Cr(Ⅵ) adsorption from aqueous solution

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Chinese Journal of chemical engineering 2024年第9期73卷 51-61页

作者： Alireza Nouri Siew Fen Chua Ebrahim Mahmoudi Abdul Wahab Mohammad Wei Lun Ang Department of Chemical and Process Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangi 43600Malaysia Centre for Sustainable Process Technology(CESPRO) Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangi 43600Malaysia Chemical and Water Desalination Engineering Program College of EngineeringUniversity of SharjahSharjah 27272United Arab Emirates

Confronting the severe health threats and environmental impacts of Cr(Ⅵ) in aquatic environments demands innovative and effective remediation approaches. In this study, Graphene oxide(GO)-decorated poly(dimethyl amino ethyl methacrylate)(PDMAEMA) brush nanocomposites(GOP1, GOP2, GOP3, and GOP4) were fabricated using atom transfer radical polymerization(ATRP) by the “graft from” *** resulting nanocomposites were utilized for removing Cr(Ⅵ) with good adsorption performance due to the electrostatic interaction of protonated nitrogen groups in the brush chains with negatively charged particles in the solution. The kinetic model of pseudo-second-order best represented the contaminants' adsorption characteristics. The Weber-Morris model further indicated that surface adsorption and intraparticle diffusion mechanisms primarily controlled the adsorption procedure. Additionally, the Langmuir and Temkin isotherm models were found to most accurately represent the adsorption characteristics of the pollutants on the nanocomposites, and GOP4 can achieve the maximum adsorption capacity of 164.4 mg·g^(-1). The adsorbents' capacity maintains above 85% after five cycles of adsorption-desorption. The nanocomposites in this study demonstrate promising potential for eliminating Cr(Ⅵ) from aqueous solutions.

关键词： Graphene oxide PDMAEMA brush Polymerization Nanoparticles Adsorption Chromium

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A Comparative Study of Impact Fracture Toughness of Epoxidized Poly(1, 4 Cis-Isoprene) Compatibilized PLA Binary and Ternary Blends

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chemical engineering and technology 2025年第2期48卷

作者： Bijarimi, Mohd Ahmad, Sahrim Ode, La Mustaqeem, Mujahid Norazmi, M. Normaya, Erna Jaafar, Jamiluddin Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Al-Sultan Abdullah Lebuh Persiaran Tun Khalil Yaakob Pahang Kuantan26300 Malaysia School of Applied Physics Faculty of Science & Technology Universiti Kebangsaan Malaysia Selangor Bangi43600 Malaysia Department of Chemistry National Taiwan University No. 1 Section 4 Roosevelt Road Taipei10617 Taiwan Department of Chemistry Kulliyyah of Science International Islamic University Malaysia Jalan Sultan Haji Ahmad Shah Bandar Indera Mahkota Pahang Kuantan25200 Malaysia Faculty of Mechanical and Manufacturing Engineering Universiti Tun Hussein Onn Malaysia Parit Raja Johor Batu Pahat86400 Malaysia

Poly(lactic acid) (PLA) is a biodegradable polymer with limited application because of its intrinsic brittleness, low toughness, and low elongation at break. Melt blends were prepared by mixing a natural rubber (NR, poly(1,4-cis-isoprene) in the form of liquid NR (LNR), liquid-epoxidized NR (LENR), and polypropylene (PP) in the PLA matrix. Four blend systems were designed and prepared, i.e., PLA–PP, PLA–PP–LNR, and PLA–LNR or PLA–LENR. The composition of PP in the blend was fixed at 10 % PLAPP (90/10). Results showed that PLA–PP mixed with LNR improved impact and elongation at break. The binary blend of PLA–LNR (90/10) significantly enhanced impact strength and elongation at break properties. In contrast, the binary blends of PLA–LENR (90/10) showed a lower value of elongation at break (9.5 % vs. 37.3%) and impact strength (4.56 kJ m−2 vs. 6.44 kJ m−2). The melting temperature (Tm) and the glass transition temperature (Tg) were measured by differential scanning calorimetry, which recorded slight changes in the glass temperatures and melting temperatures. Scanning electron microscopy images of the tensile fracture of the PLA–LNR (90/10) blend showed the presence of large fibrils associated with the ductile failure related to neat PLA. Finally, the fracture toughness (KIC) of PLA–LNR (90/10) showed an increase of 39 % over neat PLA (2.94 MPa.m1/2 vs. 4.08 MPa.m1/2). © 2024 Wiley-VCH GmbH.

关键词： Fracture toughness

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Hydrothermal carbonisation of fruit waste for sustainable remediation of methylene blue from aqueous solution: A zero-waste approach

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Journal of Molecular Liquids 2025年

作者： Fathimath Afrah Solih Archina Buyhiyappan Nuradila Zahirah Mohd Azmi Abdul Aziz Abdul Raman Sustainable Process Engineering Centre (SPEC) Department of Chemical Engineering Faculty of Engineering University of Malaya 50603 Kuala Lumpur Malaysia Department of Science and Technology Studies Faculty of Science University of Malaya 50603 Kuala Lumpur Malaysia

Hydrothermal carbonisation presents a promising technology for the sustainable management of fruit waste, aligning with zero-waste principles. Therefore, this study investigates using hydrothermal carbonisation to convert a mixture of avocado seed and banana peel into a hydrochar for methylene blue dye remediation. To enhance the efficiency of the raw hybrid adsorbent, it has been chemically activated with phosphoric acid and impregnated with manganese oxide. Key parameters like mixing ratio of fruit wastes, carbonisation temperature and activation temperature were optimised. The physicochemical analysis revealed that the metal-impregnated hybrid adsorbent had a higher surface area than the unmodified adsorbent and consisted of additional oxygenated functional groups such as phosphorus and manganese. The comparison study demonstrated that the metal-impregnated hybrid adsorbent is the most efficient, achieving complete colour removal, 85 % COD removal, with a maximum adsorption capacity of 257 mg/g. The kinetic and isotherm studies confirmed that metal-impregnated hybrid adsorbent fitted well with the pseudo-second-order kinetic model (R 2 : 0.9529) and the Redlich-Peterson isotherm model (R 2 : 0.9529), suggesting a dominantly homogenous chemisorption process. Furthermore, the reusability study revealed that HA/Mn has a 62 % higher regeneration capacity, resulting in an 88 % cost reduction compared to commercial adsorbent, indicating the economic feasibility of metal-impregnated hybrid adsorbent. This research shows the dual benefits of hydrothermal carbonisation in waste valorisation and environmental protection, offering an eco-friendly solution for fruit waste disposal while addressing the critical issue of environmental remediation.

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Recent Advances in Catalytic Carbonylation Reactions in Alternative Reaction Media

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Chinese Journal of Chemistry 2024年第4期42卷 406-429页

作者： Csaba Árvai László T.Mika Department of Chemical and Environmental Process Engineering Faculty of Chemical Technology and BiotechnologyBudapest University of Technology and EconomicsMűegyetem rkp.3H-1111 BudapestHungary

Since the discovery of the hydroformylation(oxo-synthesis or Roelen reaction)and the Reppe-reaction,the transition metal-catalyzed carbonylation reactions,providing versatile,facile,and even atom-economic methods for the selective incorporation of C=O functionality to various skeletons,have gained tremendous importance in synthetic organic chemistry from laboratories to industrial *** carbonylation of carbon-carbon multiple bonds,aromatic halides,triflates,etc.,in the presence of various nucleophiles has led the way to produce aldehydes,carboxylic acids,esters,amides,etc.,in the fine chemical ***,these protocols usually proceed in conventional,fossil-based,and usually toxic reaction ***,several attempts have been directed to developing efficient carbonylation methods in alternative,less harmful,non-fossil-based and even in renewable reaction *** this review,we overview the recent applications of alternative solvents such as water,biomass-based alcohols,γ-valerolactone(GVL),2-methyltetrahydrofuran(2-MeTHF),ionic liquids(ILs),deep eutectic solvents(DES),alkyl levulinates,limonene,α-pinene,and dimethyl carbonate as well as fluorous media to improve efficiency,safety and environmentally benign nature of carbonylation protocols.

关键词： Carbonylation Catalysis Solvents Green chemistry Carbon monoxide Transition metals Homogeneous catalysis Palladium

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