Article
Polymer Science
Natalia Sh. Lebedeva, Elena S. Yurina, Sabir S. Guseinov, Yury A. Gubarev, Anatoly I. V'yugin
Summary: Chitosan, a naturally occurring polysaccharide, can form complexes with metallophthalocyanines such as copper(II)-(CuPc) and cobalt(II)-(CoPc) tetrasulphophthalocyanines. The study investigated the thermal stability of chitosan and its complexes with phthalocyanines in oxidizing and inert atmospheres, revealing different reaction pathways and product formations. Metallophthalocyanines were found to enhance the antioxidant properties of chitosan, increasing the temperature at which glycosidic bond cleavage reaction begins.
Article
Thermodynamics
Jose Luis Perez-Rodriguez, Maria Luisa Franquelo, Adrian Duran
Summary: Thermal analysis techniques such as TG, DTA and X-ray thermodiffraction are used in this study to evaluate and characterize pigments and supports of wall paintings from the San Isidoro del Campo Monastery in the 15th century. The different colors of the wall paintings are identified, along with the technology and raw materials used in their manufacture. The paintings were made using the fresco technique on support mortars made of calcite, quartz, and straw.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Chemistry, Multidisciplinary
Fangjun Chen, Shiliang Yang, Jianhang Hu, Qingang Xiong
Summary: This study investigates the catalytic effect of calcined copper slag on the pyrolysis of municipal sewage sludge. The results show that copper slag can accelerate the thermal decomposition rate of sewage sludge and affect the composition of the gaseous products. This is of great significance for the integrated resource recycling of these two solid wastes.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Chemistry, Analytical
Jiangfei Duan, Shengxia Feng, Weilong He, Rui Li, Peng Zhang, Yu Zhang
Summary: The manuscript utilized TG-FTIR, Py-GC/MS, and kinetic models to study the pyrolysis characteristics of electrolytic manganese residue. The pyrolysis process was divided into five stages, each with different kinetic mechanisms and released gases, with NH3, CO2, and SO2 as the major gases. The intermediate product of CO was unstable and participated in reactions promoting the formation of CO2 and SO2.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2021)
Article
Thermodynamics
Dijana Jelic, Mirjana Dermanovic, Andela Markovic, Nebojsa Manic, Suzana Velickovic, Filip Veljkovic, Bojan Jankovic
Summary: This study provides a detailed analysis of the thermo-oxidative degradation behavior of a solid state supplement formulation of vitamin D3-Ca (CaCO3 form). Analytical techniques including ATR-FTIR spectroscopy and MALDI-MS were used to analyze the homogeneity of active pharmaceutical ingredients within the formulation. The results revealed a mechanism involving single-step unbranched reactions and consecutive reactions, and identified several degradation products with important immune-enhancing properties.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
G. Malata, E. Tkaczewska
Summary: The aim of the study was to investigate the impact of temperature on the pozzolanic reactivity of thermally activated attapulgite and sepiolite samples. Different activation temperatures were chosen for the two minerals. The study observed that a higher activation temperature enhances the reactivity of attapulgite and sepiolite, with the upper limit being the formation of enstatite and deactivation of silica. The reactions also resulted in the formation of various minerals due to impurities present in the minerals.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Zbigniew Zawieja, Jacek Sawicki
Summary: This paper presents the results of a study on gas evolution from a patented modified cellulose mix used in the production of no-bake casting molds. The experiments show that the gas emissions from the modified mixtures during thermal degradation do not contain hazardous or dangerous substances, making it a more environmentally friendly solution compared to existing formulas on the market.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Energy & Fuels
Saad A. El-Sayed, Tarek M. Khass, Mohamed E. Mostafa
Summary: The goal of this study is to investigate the thermal degradation of palm fronds, olive leaves, and wheat straw through pyrolysis and calculate their kinetic data. The results showed that the values of activation energy obtained from the integral method were almost identical to those obtained from the KAS and OFW methods. Reaction-order models yielded greater frequency factor values than diffusion models, indicating simpler and quicker pyrolysis. The calculated △G(av) values demonstrated the degradation sequence of olive leaves > wheat straw > palm fronds.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Biochemistry & Molecular Biology
Xin-Can Li, Fang-Fang Li, Wen-Jing Pei, Jing Yang, Yu-Long Gu, Xiang-Lan Piao
Summary: Rare ginsenosides Rg3, Rk1, and Rg5 can be obtained from Panax ginseng through heat treatment of Gynostemma pentaphyllum. The study used scanning electron microscopy (SEM) and thermal gravity-differential thermal gravity (TG-DTG) to investigate the process, and liquid chromatography-mass spectrometry (LC-MS) to analyze the content change of ginsenosides. The results showed that the formation of new saponins before and after heat treatment was due to the breakage or rearrangement of chemical bonds. Additionally, the content of ginsenoside Rb3 decreased while the contents of ginsenoside Rk1 and Rg5 increased after heat treatment. The rare ginsenosides Rg3(S), Rg3(R), Rk1, and Rg5 can be obtained from G. pentaphyllum through heat treatment.
Article
Environmental Sciences
Guiying Xu, Xinghui Cai, Shan Wang, Baizeng Fang, Hanxi Wang, Youjian Zhu
Summary: This study investigated the co-pyrolysis features and gas products of oily sludge and waste tires using thermogravimetric-infrared spectroscopy. The results showed that the co-pyrolysis of these two materials exhibits synergistic effects, providing valuable data for the treatment of oily sludge and waste tires in collaboration.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Thermodynamics
Agnieszka Kijo-Kleczkowska, Magdalena Szumera, Adam Gnatowski, Dominik Sadkowski
Summary: This paper presents a comparative analysis of different fuels and waste materials using thermal analysis techniques. The aim is to explore the potential use of these materials in polymer composites, thermal co-utilization, and energy recovery. The results show that changes in DSC, TG, and DTG values are mainly influenced by the composition of the materials. Quartz sand with organic substance and fly ash exhibit the lowest exothermic effects, while coal has the highest carbon content and calorific value.
Article
Engineering, Multidisciplinary
Justyna Zygmuntowicz, Paulina Wiecinska, Marcin Wachowski, Marta Kurek, Waldemar Kaszuwara
Summary: This research aimed to investigate phenomena occurring in a mixture of Al2O3-Cu-Mo powders during thermal treatment above 1000 degrees C. TG and DTA measurements were used to observe changes during the thermal treatment process. The oxidation and decomposition processes of the specimens were observed by conducting DTA/TG measurements in argon and synthetic air. The research compared the results of Al2O3-Cu-Mo samples with two-component systems: Al2O3-Cu and Al2O3-Mo. The study revealed that oxidation reactions and the formation of new phases occur in Al2O3-Cu-Mo samples at temperatures above 430 degrees C.
Article
Green & Sustainable Science & Technology
Durica Katnic, Milena Marinovic-Cincovic, Slavica J. Porobic, Ivica Vujcic, Aleksandra Saponjic, Biljana Sikiric, Dragana Zivojinovic
Summary: Redirecting waste biomass back into the economy has economic and environmental benefits. This research characterized waste biomass and investigated its combustion behavior using physico-chemical analysis and thermal analysis techniques. The kinetic analysis of the biomass decomposition process was performed, and different methods were used to obtain activation energy values. The results can be used for the design of pyrolysis reactors and have ecological significance in solving solid waste disposal problems.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Thermodynamics
Tuba Hatice Dogan, Jale Naktiyok
Summary: This study investigated the thermal behaviors and kinetics of biodiesels derived from beef tallow and corn oils. The results revealed that the biodiesel samples contained both saturated and unsaturated fatty acid methyl esters. The activation energies for the combustion process of biodiesels were determined and found to be similar for both beef-tallow and corn-oil biodiesels. Additionally, the cloud point and cold filter plugging point values were obtained from the analysis.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Energy & Fuels
Norbert Miskolczi, Szabina Tomasek
Summary: This study investigated the pyrolysis process of municipal sewage sludge samples using thermogravimetric analysis. The results revealed that decomposition reactions occurred in the range of 200-600℃ and involved biodegradable components, proteins, and carbohydrates. The study also compared different methods for calculating the kinetic parameters and found variations in the activation energy range for samples from different sources.
