Article
Thermodynamics
Dominik Niewes, Marcin Biegun, Marta Huculak-Maczka, Kinga Marecka, Maciej Kaniewski, Jakub Zielinski, Jozef Hoffmann
Summary: Humic acids (HA) are widely considered for fertilizer production due to their positive effect on soil structure and the improvement of nutrient uptake efficiency in plant roots. This study aimed to investigate the influence of humic acids extracted from peat and lignite on the thermal decomposition of HA and mixtures of ammonium nitrate (AN) and humic acids. Spectroscopic methods and elemental analysis were used to assess the quality of HA. The results showed differences in the degree of humification and elemental composition of the extracted HA. The molecular structure and functional group content of HA significantly affected the thermal decomposition process.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Agronomy
Maris Klavins, Santa Grandovska, Vaira Obuka, Gederts Ievinsh
Summary: Demand for new biological technologies in agriculture, particularly in restoring soil fertility, has led to the development of products from natural sources like humic substances. This study compared the stimulating effects of humic substances from different origins on plant development, finding significant differences based on their sources.
Article
Water Resources
Gabrijel Ondrasek, Ivana Jelovica Badovinac, Robert Peter, Mladen Petravic, Jelena Macan, Zed Rengel
Summary: The study found that salt-affected and sandy soils can exacerbate the transfer of the metal cadmium into the food chain. Salinity, humates, and cadmium contamination significantly influenced the accumulation of cadmium in strawberry plants, with elevated concentrations exceeding the European maximum limit in leaves and fruits. Surface analyses revealed the different properties of the substrates, with the SiO2-rich substrate having a nonporous and chemically unreactive surface, and the humates matrix characterized by abundant micro-porosity and reactive radicals. Chemical speciation modeling showed that most of the cadmium in the rhizosphere solution was dissolved and distributed among various pools, including bioavailable Cd2+, Cl-complexed, and HA-complexed forms.
EXPOSURE AND HEALTH
(2022)
Article
Biotechnology & Applied Microbiology
Jing-Hua Yao, Bai-Chao Xu, De-Yu Zhuo, Lei Xiao
Summary: This study optimized the process parameters of lignite bioconversion using ANN and GA, and the results showed that the optimal process parameters are 29 degrees C, initial pH of 7, 180 rpm, CuSO4 of 0.6 mmol·L-1, MnSO4 of 0.4 mmol·L-1, and VA of 6.4 μmol·L-1, with good predictability and support for industrial bioconversion of lignite.
BIOPROCESS AND BIOSYSTEMS ENGINEERING
(2022)
Article
Engineering, Environmental
Ehsan Sarlaki, Mohammad Hossein Kianmehr, Marzieh Ghorbani, Ali Mashaallah Kermani, Keyvan Asefpour Vakilian, Irini Angelidaki, Yajing Wang, Vijai Kumar Gupta, Junting Pan, Meisam Tabatabaei, Mortaza Aghbashlo
Summary: A cost-effective and energy-efficient nitro-humification process was developed for nitrogen functionalization and activation of lignite humic substances. Different metrics were determined for the processed lignite including solubility, physicochemical properties, oxidation degree, nitrogen functionalization, spectral ratios, and surface functionalization. The process showed improved solubility, balanced nitrogen binding forms, and enhanced carbon and nitrogen content. It also increased cation exchange capacity, carboxylic and phenolic groups, crystallinity index, and availability of macromicronutrients and rare earth elements.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Tatiana Skripkina, Olga Rozhanskaya, Aleksey Bychkov, Igor Gossen, Oleg Lomovsky
Summary: Mechanochemical modification of lignite with an eco-friendly oxidizer, sodium percarbonate, allows for one-step solvent-free oxidation. The oxidized lignite can enhance grass height and weight, especially when combined with fertilizer and additional sowing. The study provides recommendations for maintaining lawns on highway dividers.
WATER AIR AND SOIL POLLUTION
(2022)
Article
Energy & Fuels
Lin Hu, Long He, Xianhou Guo, Guanghua Wang
Summary: This study investigated the effects of heating rate and ash content on the pyrolysis kinetic characteristics of ZhaoTong lignite using thermogravimetric analysis (TGA) method. It was found that the non-isothermal pyrolysis process of lignite was strongly influenced by the heating rate and ash content. The demineralization treatment of raw lignite resulted in an increase in carboxyl groups content and a decrease in hydroxyl content and minerals content. The pyrolysis kinetics characteristics, such as activation energy (E) and frequency factor (A), were discussed using the Coats-Redfern method. The study also showed that the activation energy of lignite pyrolysis increased with increasing heating rate, while it decreased with increasing ash content. These findings provide a theoretical foundation for the large-scale pyrolysis of lignite.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Article
Chemistry, Multidisciplinary
Yafu Tang, Yuechao Yang, Shanmin Hou, Dongdong Cheng, Yuanyuan Yao, Shugang Zhang, Jiazhuo Xie, Xiaoqi Wang, Xiaoxiao Ma, Zhen Yu, Shan Li
Summary: The ecofriendly and multifunctional Fe-humic acid (HA) complex was successfully prepared using simply ball milling lignite with double-shelled Fe-N hollow mesoporous carbon microspheres (DS-Fe-NHC). The WHIF fertilizer obtained through this method showed higher stability of water-soluble HA and significantly promoted growth in peanuts by reducing iron deficiency symptoms. The results suggest a cost-effective and environmentally friendly solution for large-scale agriculture production.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Agriculture, Multidisciplinary
Shanshan Zhao, Denglun Chen, Yuanyuan Yao, Chenghao Liu, Bin Gao, Yan Liu, Jiahui Liu, Songyuan Wang, Ni Gao, Mingchuan Yang, Guifang Shi, Shugang Zhang, Jiazhuo Xie, Yuechao Yang
Summary: Water-soluble humic substances (WHSs) with high bioactivity and economic value can be produced by activating lignite using ammonium sulfite slurry (ASS). The yield of WHSs from activated lignite increased by 42.72% compared to unactivated lignite. The WHSs from activated lignite at lower concentrations had a more significant root-elongation-promoting effect.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Mohsen Mohammadniaei, Ming Zhang, Jon Ashley, Ulf Bech Christensen, Lennart Jan Friis-Hansen, Rasmus Gregersen, Jan Gorm Lisby, Thomas Lars Benfield, Finn Erland Nielsen, Jens Henning Rasmussen, Ellen Botker Pedersen, Anne Christine Rye Olinger, Laerke Torring Kolding, Maryam Naseri, Tao Zheng, Wentao Wang, Jan Gorodkin, Yi Sun
Summary: The study introduces a novel non-enzymatic isothermal amplification method for rapid detection of SARS-CoV-2 RNA, without the need for reverse transcription, with high specificity and sensitivity. The method is simple, fast, cost-effective, stable, and suitable for a wide range of testing needs.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Industrial
Thawin Hart-Rawung, Johannes Buhl, Alexander Horn, Markus Bambach, Marion Merklein
Summary: The hot stamping technique in the automotive industry is used to generate varying mechanical properties by controlling the cooling rate locally. However, there is a need for a new phase transformation model that can accurately represent complicated thermal histories and deformation effects. This research proposes a 'unified JMAK' model capable of capturing different thermal-mechanical loading conditions, including non-linear cooling paths. The performance of the model is compared to other well-known transformation models and shows promising results.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
T. A. Yarkova, A. M. Gyul'maliev
Summary: The thermodynamic stability of iron and magnesium ions at different acidity levels in aqueous medium was investigated using chemical thermodynamics methods and Pourbaix diagrams. The temperature dependence of the thermodynamic functions for the relevant reactions was calculated. The feasibility of replacing potassium and sodium ions with iron and magnesium ions in aqueous solutions of humic acid salts containing carboxyl and hydroxyl groups was demonstrated, leading to the formation of water-soluble iron and magnesium humates with high potential for practical applications.
SOLID FUEL CHEMISTRY
(2023)
Article
Biotechnology & Applied Microbiology
Ying Wang, Litong Ma, Jun Li
Summary: The conversion of lignite to clean energy is important for carbon reduction, and corn straw has been found to enhance hydrogen production from lignite, with the optimal content of 40%. This provides a new idea for improving hydrogen production through lignite anaerobic fermentation.
FERMENTATION-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Xiongxin Peng, Shuang Gai, Kui Cheng, Fan Yang
Summary: The study conducted hydrothermal humification kinetics experiments using corn straw as raw material and employed characterization techniques such as ultra-performance liquid chromatography, nuclear magnetic resonance spectroscopy, and Fourier-transform ion cyclotron resonance mass spectrometry to determine the formation mechanism of artificial humic substances (A-HS). The results showed that in an alkaline environment, rapid dissociation of lignocellulose can occur, with cellulose and hemicellulose being hydrolyzed into glucose and xylose, further dehydrated to form 5-hydroxy furfural and furfural, and then rehydrated to synthesize levulinic acid and other small molecular acids. These small precursors then combine with lignin fragments to form fulvic acids, humic acids, and even humin. The proposed mechanism of hydrothermal humification is of great significance for the design, synthesis, and application of A-HS in sustainable agriculture.
Article
Materials Science, Multidisciplinary
Ivan Miguel De Cachinho Cordeiro, Anthony Chun Yin Yuen, Timothy Bo Yuan Chen, Wei Wang, Wei Yang, Qing Nian Chan, Guan Heng Yeoh
Summary: This study investigates the oxidation kinetics of graphite using molecular dynamics simulation. The results show good agreement with experimental data, indicating the feasibility of this method in studying graphite oxidation.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Editorial Material
Thermodynamics
Romana Cerc Korosec, Andrei Rotaru
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2017)
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Thermodynamics
Andrei Rotaru, Anca Moanta, Catalin Constantinescu, Marius Dumitru, Horia Octavian Manolea, Andreea Andrei, Maria Dinescu
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2017)
Editorial Material
Thermodynamics
Petru Budrugeac, Andrei Rotaru
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2018)
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Materials Science, Ceramics
Ana Harabor, Petre Rotaru, Novac Adrian Harabor, Petr Nozar, Andrei Rotaru
CERAMICS INTERNATIONAL
(2019)
Article
Materials Science, Ceramics
Andrei Rotaru, Finlay D. Morrison
CERAMICS INTERNATIONAL
(2019)
Article
Thermodynamics
Marian Leulescu, Andrei Rotaru, Ion Palarie, Anca Moanta, Nicoleta Cioatera, Mariana Popescu, Emilian Morintale, Maria Viorica Bubulica, Gabriel Florian, Ana Harabor, Petre Rotaru
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2018)
Editorial Material
Thermodynamics
Andrei Rotaru, Tudor Lupascu, Florentin Paladi
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2018)
Editorial Material
Materials Science, Ceramics
Andrei Rotaru, Finlay D. Morrison, Ion Tiginyanu
CERAMICS INTERNATIONAL
(2019)
Article
Thermodynamics
G. Florian, Augusta Raluca Gabor, C. A. Nicolae, A. Rotaru, Cornelia A. Marinescu, Gabriela Iacobescu, N. Stanica, Sonia Degeratu, Oana Gingu, P. Rotaru
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2019)
Article
Thermodynamics
Alexandru R. Corbu, Andrei Rotaru, Violeta Nour
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2020)
Editorial Material
Thermodynamics
Andrei Rotaru, Dana Luca Motoc, Vlad T. Popa, Crisan Popescu
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2019)
Article
Thermodynamics
G. Florian, Augusta Raluca Gabor, C. A. Nicolae, A. Rotaru, N. Stanica, N. G. Bizdoaca, P. Rotaru
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2020)
Article
Biochemistry & Molecular Biology
Luminita Nicoleta Dumitrescu, Patricia Neacsu, Madalina G. Necula, Anca Bonciu, Valentina Marascu, Anisoara Cimpean, Antoniu Moldovan, Andrei Rotaru, Valentina Dinca, Maria Dinescu
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Chemistry, Inorganic & Nuclear
Vasile Lozovan, Victor Ch Kravtsov, Elena Gorincioi, Andrei Rotaru, Eduard B. Coropceanu, Nikita Siminel, Marina S. Fonari
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Biochemistry & Molecular Biology
Tudor Lupascu, Oleg Petuhov, Nina Timbaliuc, Silvia Cibotaru, Andrei Rotaru