Review
Chemistry, Physical
Amiruddin Isa, Norlin Nosbi, Mokhtar Che Ismail, Hazizan Md Akil, Wan Fahmin Faiz Wan Ali, Mohd Firdaus Omar
Summary: Carbon fibre waste management is a global environmental issue. Recycling carbon fibre waste needs to address the issue of degradation in performance and study the degradation mechanism to enhance its properties and durability.
Article
Materials Science, Multidisciplinary
Victor S. Cecon, Greg W. Curtzwiler, Keith L. Vorst
Summary: The use of multilayer plastic film has increased in packaging applications due to its improved performance. However, the presence of multiple polymers makes recycling difficult. The STRAP process shows promise as a solution, but its effect on the retrieved polymers is still unknown. This study evaluates the physical, molecular, and thermal properties of recovered polymers using the STRAP process and identifies changes in thermal properties.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2022)
Review
Engineering, Manufacturing
Ben Newman, Claudia Creighton, Luke C. Henderson, Filip Stojcevski
Summary: Milled carbon fibres, typically around 100 μm in length, are used as reinforcing materials in the composites industry for applications such as structural reinforcement, sensor technology, electrical conductivity, and material multifunctionality. However, there is currently a lack of unified knowledge to consolidate the understanding and scope of milled fibres. This review summarizes the major research and development areas of milled carbon fibres and discusses some of the economic and logistical concerns for implementing research advancements into industrial settings.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
R. Kandeeban, R. Brindha, K. Manojkumar, Khalid Mujasam Batoo, Emad H. Raslan, Muhammad Hadi, Ahamad Imran, K. Saminathan
Summary: The study reports a method for synthesizing Kish graphite from polyethylene waste, which exhibits excellent performance in the Mg-air battery system. By using Kish graphite as a supportive electrocatalyst, the catalytic activity for oxygen reduction reaction was enhanced, resulting in good discharge performance.
Review
Chemistry, Physical
Maximiliano A. Zensich, Alvaro Caballero, Alvaro Y. Tesio
Summary: This review summarizes the latest advancements in the recovery of graphite for electrochemical energy storage devices, beyond just lithium-ion batteries. The focus is on the characteristics of graphite recycled through different processes and its impact on electrochemical performance. An analysis of the pros and cons of each method considers factors such as environmental impact, cost, and material usability. Finally, the article outlines challenges and future perspectives.
CURRENT OPINION IN ELECTROCHEMISTRY
(2023)
Article
Polymer Science
Siqi Hao, Lizhe He, Jiaqi Liu, Yuhao Liu, Chris Rudd, Xiaoling Liu
Summary: This study successfully recovered carbon fibers through microwave pyrolysis and investigated the recovered fibers' properties and chemical compositions. It was found that the strength of the recovered fibers decreased by less than 20% compared to virgin fibers, and this reduction could be mitigated by reducing the pyrolysis temperature.
Article
Chemistry, Multidisciplinary
Jialu Xu, Xiaolan Duan, Pengfei Zhang, Qiang Niu, Sheng Dai
Summary: This study developed a mechanochemical extrusion approach to convert PET waste into functional carbon materials, providing a sustainable solution to fight against plastic pollution.
Article
Chemistry, Multidisciplinary
Caozheng Yan, Lewis Kamande Njaramba, Antony Mutua Nzioka, Benard Ouma Alunda, Myung-Gyun Kim, Ye-Jin Sim, Young-Ju Kim
Summary: This study assessed the changes in the fiber properties of virgin and recovered fibers from lab-scale and pilot-scale depolymerization reactors based on the thermal air oxidation-resistance characteristics. The lab-scale had the highest solvent temperature rate increase due to the small depolymerization volume and the dominant role of the cavitation volume. The structural properties of the recovered fibers remained intact even after depolymerization and pretreatment.
Article
Materials Science, Textiles
Zunjarrao Kamble, Bijoya Kumar Behera, Teruo Kimura, Ino Haruhiro
Summary: Thermoset nanocomposites reinforced with cotton fibres extracted from textile waste and graphite oxide nanoparticles as filler were developed and characterized. The composites showed potential for applications in furniture materials and automotive components.
JOURNAL OF INDUSTRIAL TEXTILES
(2022)
Article
Materials Science, Composites
Magnus Gebhardt, Ioannis Manolakis, Gerhard Kalinka, Joachim Deubener, Souvik Chakraborty, Dieter Meiners
Summary: The study evaluated the potential of reusing recovered carbon fiber fabrics in manufacturing 2nd generation composite laminates, which showed an increase in damping attributed to a residual thermoplastic layer on the fibers. Additionally, the interfacial adhesion of the 2nd generation composites appears to be less influenced by the type of matrix used.
COMPOSITES COMMUNICATIONS
(2021)
Article
Materials Science, Composites
Rejean Belliveau, Benoit Landry, Gabriel LaPlante
Summary: Discontinuous long-fibre (DLF) composites often face weak points due to unfavorable fibre orientation angles during the manufacturing process. This research utilizes woven fibre chips instead of unidirectional fibre chips to reduce the possibility of weak points and improve the mechanical properties of DLF composites.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2023)
Article
Polymer Science
Salem Mohammed Aldosari, Muhammad A. Khan, Sameer Rahatekar
Summary: The study developed a unique method for preparing carbon fiber precursors using a blend of pitch and LLDPE, which resulted in less brittle precursors compared to neat pitch fibers. Increasing the percentage of LLDPE significantly improved the tensile properties, and the blend carbon fibers exhibited excellent thermal stability.
Review
Engineering, Environmental
Esfandiar Pakdel, Sima Kashi, Russell Varley, Xungai Wang
Summary: Carbon fibre reinforced composites play a crucial role in weight sensitive industries, emphasizing the importance of developing sustainable recycling solutions. Management of dry carbon fibre scraps has gained more attention recently, highlighting the need for effective strategies in dealing with waste products.
RESOURCES CONSERVATION AND RECYCLING
(2021)
Article
Engineering, Environmental
Alex J. Bowles, Amy L. Wilson, Geoffrey Fowler
Summary: Low levels of tyre recycling persist due to the lack of appropriate technology. Pyrolysis is a suitable method for processing waste tyres and recovering carbon-black components through the production of Recovered Carbon black (RCb). However, the performance of RCb is currently hindered by inorganic residues, which impedes closed-loop tyre recycling. Demineralisation of RCb through hydrothermal washing and hydrochloric acid treatment significantly improves its physiochemical properties.
RESOURCES CONSERVATION AND RECYCLING
(2023)
Article
Engineering, Manufacturing
Jiwan You, Young Mo Lee, Han-Hyeong Choi, Tae Ann Kim, Sang-Soo Lee, Jong Hyuk Park
Summary: The study proposed a novel method to improve the thermal stability of PK-based carbon fiber-reinforced polymers using plasma-assisted mechanochemistry. The processed CFRPs showed higher glass transition temperatures and storage moduli, leading to improved thermal stability. After annealing at 150 degrees C for 1000 hours, the tensile strength remained above 90%.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Environmental Sciences
Antony Mutua Nzioka, Myung-Gyun Kim, Hyeon-Uk Hwang, Young-Ju Kim
WASTE AND BIOMASS VALORIZATION
(2019)
Article
Materials Science, Multidisciplinary
B. O. Alunda, D. O. Agumba, I. O. Ondicho, L. O. Otieno, M. Chepkoech, N. A. Mutua, J. S. Hawong
MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK
(2020)
Article
Chemistry, Multidisciplinary
Caozheng Yan, Lewis Kamande Njaramba, Antony Mutua Nzioka, Benard Ouma Alunda, Myung-Gyun Kim, Ye-Jin Sim, Young-Ju Kim
Summary: This study assessed the changes in the fiber properties of virgin and recovered fibers from lab-scale and pilot-scale depolymerization reactors based on the thermal air oxidation-resistance characteristics. The lab-scale had the highest solvent temperature rate increase due to the small depolymerization volume and the dominant role of the cavitation volume. The structural properties of the recovered fibers remained intact even after depolymerization and pretreatment.
Article
Engineering, Multidisciplinary
Jing Jia, Lvjiang Yin, Caozheng Yan
Summary: The integrated development of urban and rural areas is crucial for rural revitalization, and the coupling coordinated development of urban-rural logistics plays a key role in promoting the exchange of agricultural and industrial products between urban and rural areas. This study measures the development levels of urban-rural logistics and urban-rural integration, analyzes the factors influencing the integrated development, and proposes measures to promote it.
MATHEMATICAL PROBLEMS IN ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Jing Jia, Wenhao Wang, Lvjiang Yin, Jin Liu, Antony Mutua Nzioka, Caozheng Yan
Summary: This manuscript proposes an integrated system for treating hospital solid waste that can operate during normal and emergency situations. The benefits of integrating different hospital solid waste treatment systems with the existing incineration system were analyzed, with a focus on the thermal friction sterilization integration system. The results show that implementing the integrated incineration-frictional systems can lead to significant savings and better resource recovery.
Article
Energy & Fuels
Valery P. Meshalkin, Nicolay A. Martsulevich, Oleg M. Flisyuk, Ilia G. Likhachev, Antony M. Nzioka
Summary: We investigated the operation of an axial-flow cyclone as the most promising dust-cleaning equipment based on energy consumption. Numerical solutions were obtained for the gas-solids suspension flow equations in axial flow cyclones with different separation chambers' geometry using FlowVision software. The chamber's geometrical features determined the nature of the gas-solids suspension flow, directly affecting the dusty gases' purification degree. Based on this analysis, it is possible to develop recommendations for choosing the chamber's geometric parameters, ensuring high efficiency and lower hydraulic resistance when designing axial-flow cyclones.
Article
Energy & Fuels
Valery Meshalkin, Alfir Akhmetov, Lyubov Lenchenkova, Antony Nzioka, Anatoly Politov, Vladimir Strizhnev, Aleksey Telin, Alsu Fakhreeva
Summary: A complex sealing compound based on natural materials processing was proposed to enhance the efficiency of shutoff operations. The mechanical activation processes were studied to investigate their influence on the mechanical and rheological properties of the developed sealants. The researchers successfully produced hybrid sealants by combining activated rice husks with mechanically activated peat.
Article
Engineering, Chemical
C. Z. Yan, A. M. Nzioka, Y. J. Sim, V. P. Meshalkin, Y. J. Kim
Summary: In this study, we investigated the thermal degradation and kinetic characteristics of the byproduct from hospital waste's thermal frictional sterilization (TFSS) using isothermal and advanced nonisothermal model formulas. The results showed that the TFSS process generates heterogeneous byproducts with high calorific values and predictable activation energy values.
THEORETICAL FOUNDATIONS OF CHEMICAL ENGINEERING
(2022)
Article
Energy & Fuels
Valeriy P. Meshalkin, Roman A. Kozlovskiy, Mikhail R. Kozlovskiy, Yaroslav A. Ibatov, Mikhail S. Voronov, Ivan A. Kozlovskiy, Tamara B. Chistyakova, Antony M. Nzioka
Summary: This study presents a novel non-catalytic interaction between ammonium lactate and n-butanol for the synthesis of butyl lactate. A mathematical model for the reactor unit of butyl lactate synthesis is derived based on the kinetic modeling of the reaction. The study provides insights into the kinetics and reaction pathways of the interaction between ammonium lactate and n-butanol.
Article
Energy & Fuels
Valery P. Meshalkin, Vladimir S. Zharov, Leopold I. Leontiev, Antony M. Nzioka, Andrey Y. Belozersky
Summary: We have proposed an impact assessment methodology for determining sustainability in energy-intensive industrial production based on a comprehensive combination of economic, environmental, and social indicators for sustainable development. The goal of this study was to disclose this methodology for assessing sustainability in energy-intensive industrial production. We proved that any energy-intensive chemical, metallurgical, and energy generation processes should maximize the material output values and product value addition to ensure innovative sustainable development.
Article
Engineering, Environmental
Lewis Kamande Njaramba, Jung-Bo Park, Chang-Soo Lee, Antony Mutua Nzioka, Young-Ju Kim
Summary: This study utilized ZVI and pumice to remove contaminants from synthetic groundwater, finding that the modified bed packing enhanced gas and water transport and heavy metal(loid) removal. However, clogging phenomena were also observed in the process.
ENVIRONMENTAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Chemical
C. Z. Yan, M. G. Kim, H. U. Hwang, A. M. Nzioka, Y. J. Sim, Y. J. Kim
THEORETICAL FOUNDATIONS OF CHEMICAL ENGINEERING
(2020)
