Article
Energy & Fuels
Qing-Lin Li, Rui Shan, Shu-Xiao Wang, Hao-Ran Yuan, Yong Chen
Summary: This study investigates the influence of support materials on the reactivity of nickel-based catalysts in the production of carbon nanotubes from polyethylene. The results reveal that the Ni/Al2O3 catalyst shows the highest carbon material yield due to its unique structural characteristics. In contrast, the Ni/TiO2, Ni/ZrO2, and Ni/Nb2O5 catalysts exhibit poor performance in terms of carbon nanotube formation.
Article
Energy & Fuels
Haoyu Xiao, Shujiang Li, Zhen Shi, Cunhao Cui, Sunwen Xia, Yingquan Chen, Zhongyue Zhou, Xin Tu, Xu Chen, Haiping Yang, Hanping Chen
Summary: Plasma-catalytic pyrolysis is a promising technology for upgrading plastic waste and producing hydrogen and high-value carbon materials. This study investigated the role of plasma in the pyrolysis of polypropylene (PP) and found that plasma can further activate and cleave the pyrolysis volatiles, resulting in more active carbon species for the growth of carbon nanotubes (CNTs). Compared to conventional catalytic pyrolysis, plasma addition significantly reduced the formation temperature of CNTs and promoted the conversion of liquid and gaseous products to CNTs and hydrogen. The addition of plasma also improved the graphitization degree of CNTs and reduced their defectivity. The findings highlight the potential of plasma-catalytic pyrolysis for the valorization of plastic waste.
Review
Engineering, Environmental
Abir Azara, Salma Belbessai, Nicolas Abatzoglou
Summary: Waste plastics pose challenges to the environment and ecosystems due to their non-biodegradable nature. Thermochemical recycling can convert waste plastics to high-value products and produce filamentous carbon nanomaterials. While progress has been made in the synthesis of filamentous carbon nanomaterials, a complete understanding of the growth mechanism is still lacking.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Analytical
Katherine A. Graves, Luke J. R. Higgins, Mohamad A. Nahil, Bhoopesh Mishra, Paul T. Williams
Summary: Polypropylene and polystyrene were processed with a Ni-Fe/Al2O3 catalyst to produce carbon nanotubes (CNTs) in a pyrolysis/catalytic reactor. The MWCNTs produced had different structures and properties depending on the source of the plastic. Commercially produced MWCNTs showed higher degree of graphitisation and fewer defects compared to plastic derived MWCNTs.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Engineering, Environmental
Meng Xie, Hai Xu, YiXuan Wang, Helin Pan, Dengle Duan, Bo Niu, Donghui Long, Yayun Zhang
Summary: Metal oxides can convert waste plastics into hydrogen fuel by microwave pyrolysis, addressing global ecological pollution. However, agglomeration and poor porosity of metal oxides restrict further applications. In this study, two-dimensional metal oxide nanosheets with a porous network were developed for recycling high-purity hydrogen and carbon nanotubes from waste plastics. The porous structure significantly improved the growing space of carbon nanotubes and enhanced wave absorption, resulting in high H2 selectivity and yield, as well as high-value carbon nanotubes. The reaction mechanism for microwave-induced catalytic pyrolysis was proposed. This research offers new insights into waste plastic recovery using metal oxides through microwave pyrolysis.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Shuxiao Wang, Yibo Sun, Rui Shan, Jing Gu, Taoli Huhe, Xiang Ling, Haoran Yuan, Yong Chen
Summary: The aim of this study is to efficiently produce hydrogen-rich syngas. The thermal conversion experiment of polypropylene was carried out using a two-stage pyrolytic-catalytic device. A new activated carbon based catalyst was developed, and the catalytic performance of monomial and bimetallic catalysts was explored. The method of hydrogen production from waste plastic cracking in this paper will provide new ideas for high value utilization of plastic and hydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Environmental
Lujun Zhao, Jiaming Shao, Li Xiang, Yiping Feng, Zhihua Wang, Fawei Lin
Summary: Pyrolysis of oily sludge (OS) can be improved by coprocessing with polyethylene (PE), resulting in higher oil quality and more valuable gas products. The strong interaction between OS and PE allows for their mutual degradation at high temperature, leading to enhanced gas release and inhibition of nitrogenous and sulphurous pollutants.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Xuan Liu, Siyang Zhang, Jiashun Liang, Shenzhou Li, Hao Shi, Jinjia Liu, Tanyuan Wang, Jiantao Han, Qing Li
Summary: In this study, protrusion-rich Cu@NiRu core@shell nanotubes were synthesized using a facile wet chemistry method and employed for hydrogen evolution reaction (HER) in an alkaline environment. The protrusion-like RuNi alloy shells with large surface area and abundant defects optimize the surface electronic structure through electron transfer and are effectively stabilized by the unique 1D hollow structure.
Article
Chemistry, Physical
Alexander Mitulinsky, Alexander Gaydaychuk, Sergei Zenkin, Stanislav Meisner, Vlada Bulakh, Stepan Linnik
Summary: This work presents experimental data on the integration of carbon nanotubes during diamond synthesis. Carbon nanotubes layers were deposited on silicon and diamond substrates, followed by further growth of the diamond phase in an argon-free H-2/CH4 gas mixture without the use of a catalyst for carbon nanotubes growth. The study shows that carbon nanotubes etched from the substrate surface before the diamond growth process began, across a wide range of gas compositions.
Article
Engineering, Chemical
Yunlei Cui, Hongqing Shi, Yaning Zhang, Longfei Cui, Wenke Zhao, Wei Liu
Summary: The effects of gasification temperature, equivalence ratio, and microwave power on the syngas yields of polypropylene waste were studied. The results showed that within a certain range, increasing gasification temperature and equivalence ratio could improve syngas yield, while increasing microwave power had a certain impact on syngas yield.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Environmental
A. Lopez-Urionabarrenechea, N. Gastelu, E. Acha, B. M. Caballero, I de Marco
Summary: This study presents a novel method to valorize the residual polymeric matrix of carbon fiber reinforced polymers (CFRP) through pyrolysis in the recycling process of carbon fibers. By optimizing operational parameters in the pyrolysis and oxidation steps, clean carbon fibers and a gaseous fraction with 75% volume of H2 were successfully obtained.
Article
Engineering, Environmental
Andrei Veksha, Wenqian Chen, Lili Liang, Grzegorz Lisak
Summary: This article reports on a tandem catalytic system for the growth of few-walled carbon nanotubes (CNTs) from plastic waste. Under appropriate conditions, the plastic pyrolysis gas can be selectively converted into few-walled CNTs with small outer diameters.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
Ning Cai, Sunwen Xia, Xiaoqiang Li, Lin Sun, Pietro Bartocci, Francesco Fantozzi, Haozhe Zhang, Hanping Chen, Paul T. Williams, Haiping Yang
Summary: This study introduced different iron ratio catalyst supported with alumina to improve the properties of products during the thermal conversion of waste plastics. The results showed an increase in hydrogen and carbon nanotubes content with increasing iron ratio, while liquid oil yield decreased.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
Hua Zhang, Xiao-Li Zhou, Li-Ming Shao, Fan Lu, Pin-Jing He
Summary: This study explores a sustainable approach to upcycle PET waste into methane-rich pyrolysis gas and carbon materials for energy storage. The activated carbon materials prepared through post-activation exhibit excellent performance as electrodes in supercapacitors, showing promise for mitigating plastic pollution and addressing the energy crisis.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Thermodynamics
Ning Cai, Sunwen Xia, Haoyu Xiao, Yingquan Chen, Wei Chen, Haiping Yang, Chunfei Wu, Hanping Chen
Summary: The catalytic pyrolysis of waste plastics with iron-based catalyst can simultaneously produce H2 rich gas, liquid oil, and carbon nanotubes (CNTs). This study investigated the catalytic pyrolysis of polypropylene (PP) and analyzed the influence of catalyst and temperature. The results showed that lower temperatures favored the production of waxes, while higher temperatures promoted the formation of aromatic hydrocarbons. With the introduction of catalysts, a large amount of liquid oil was converted into carbon deposits, leading to the release of more light gases, such as hydrogen. Lower temperatures mainly produced CNTs, while higher temperatures mainly produced carbon spheres. The optimal catalytic temperature was found to be around 800°C, with hydrogen yield of approximately 35 mmol/g plastic, hydrogen efficiency of 50%, and carbon nanotube yield of over 320 mg/g plastic.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Engineering, Environmental
Sunil K. Deokar, Ganesh S. Bajad, Payal Bhonde, R. P. Vijayakumar, Sachin A. Mandavgane
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2017)
Article
Engineering, Manufacturing
Ganesh Bajad, Rajat Jain, Warun Harhare, R. P. Vijayakumar, Suryasarathi Bose
MATERIALS AND MANUFACTURING PROCESSES
(2017)
Article
Metallurgy & Metallurgical Engineering
Shraddha Gondane, Arun K. Singh, R. P. Vijayakumar, Nitish Sinha
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2018)
Article
Green & Sustainable Science & Technology
Ashutosh Kr Chaudhary, R. P. Vijayakumar
ENVIRONMENT DEVELOPMENT AND SUSTAINABILITY
(2020)
Article
Materials Science, Multidisciplinary
Sandhya S. Gedam, Ashutosh Kr Chaudhary, R. P. Vijayakumar, A. K. Goswami, Ganesh S. Bajad, Dharm Pal
MATERIALS RESEARCH EXPRESS
(2019)
Article
Green & Sustainable Science & Technology
Ashutosh Kr Chaudhary, R. P. Vijayakumar
ENVIRONMENT DEVELOPMENT AND SUSTAINABILITY
(2020)
Article
Materials Science, Paper & Wood
Parul Dwivedi, R. P. Vijayakumar, Ashutosh Kr Chaudhary
Article
Polymer Science
Ashutosh Kr Chaudhary, R. P. Vijayakumar
JOURNAL OF POLYMER RESEARCH
(2020)
Article
Materials Science, Biomaterials
Rujuta Dhoke, Abhishek Ojha, Ashutosh Kr Chaudhary, R. P. Vijayakumar
Summary: Biopolyols were prepared from sugarcane bagasse and rice husk through liquefaction which were used for the preparation of PU foam. Increasing the content of biopolyol resulted in higher density and foaming time of the PU foam, suitable for making different types of foam. Analysis using FTIR and SEM confirmed the characteristic features of PU foam, while the addition of carbon nanotubes improved the thermal conductivity of the foam.
Article
Microbiology
Ashutosh Kr Chaudhary, Kundrapu Chaitanya, R. P. Vijayakumar
Summary: The study demonstrated that the Cephalosporium strain NCIM 1251 is effective in degrading pre-treated polystyrene, with UV and acid treatment increasing the thermal stability of pure polystyrene while decreasing in pre-treated polystyrene after incubation with Cephalosporium strain NCIM 1251. This was confirmed through FTIR, gravimetric analysis, and SEM observations.
ARCHIVES OF MICROBIOLOGY
(2021)
Article
Environmental Sciences
Ashutosh Kr Chaudhary, Kundrapu Chaitanya, Raghvendra Dalmia, R. P. Vijayakumar
Summary: This study investigated the ability of Thermomyces lanuginosus to degrade pre-treated LDPE, revealing the synergistic effect of UV irradiation, heat, and acid pre-treatments on enhancing biodegradability. Structural modifications in LDPE chains and polymer matrix were observed post treatments, with significant reductions in weight and carbon content of the polymer samples after incubation with Thermomyces lanuginosus. SEM analysis showed alterations in morphology and texture patterns, suggesting Thermomyces lanuginosus as a promising agent for LDPE decomposition under laboratory conditions.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2021)
Article
Chemistry, Physical
Shubham P. Chitriv, Ashutosh Kr Chaudhary, Shridhar R. Yellumahanti, R. P. Vijayakumar
Summary: The study demonstrated that functionalized unzipped multi-walled carbon nanotube oxides have high efficiency and adsorption capacity for methylene blue dye. Under optimal conditions, the nano-adsorbent achieved a 99.8% dye removal efficiency and a maximum adsorption capacity of 420.14 mg/g. Furthermore, the nano-adsorbent maintained a 94% dye removal efficiency even after multiple cycles, showing its potential for practical applications in wastewater treatment.
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
(2022)
Article
Environmental Sciences
Ashutosh Kr Chaudhary, Shubham P. Chitriv, Kundrapu Chaitanya, R. P. Vijayakumar
Summary: In this study, the potential of a Cephalosporium strain in degrading pre-treated low-density polyethylene (LDPE) and high-density polyethylene (HDPE) films was investigated. Significant weight reduction was observed in both LDPE and HDPE films after 56 days of incubation with the Cephalosporium strain. Changes in the physicochemical properties of the mineral salt medium (MSM) were studied to assess the extent of biodegradation.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2023)
Article
Energy & Fuels
Ganesh Bajad, R. P. Vijayakumar, Prajwal Rakhunde, Amit Hete, Mahesh Bhade
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2017)
Article
Chemistry, Analytical
Guanshuai Zhang, Shanjian Liu, Dongmei Bi, Zhisen He, Jia Liu, Yinjiao Liu
Summary: Hydrogen peroxide pretreatment was applied for fast pyrolysis of corn stalks, and it was found that the pretreatment effectively promoted lignin depolymerization and decreased the reaction activation energy. The pretreatment also increased the cellulose content and removed alkali and alkaline earth metals from the biomass. The pH of the hydrogen peroxide solution affected the removal of lignin and ash by the pretreatment, and the composition of bio-oil changed significantly, with a significant increase in the relative content of levoglucosan after pretreatment.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2024)
