Article
Polymer Science
Yitao Liu, Zhiyuan Zhao, Ruiyu Chen, Xiaokang Xu
Summary: Properly disposing of waste polymers is a global challenge. Thermal degradation is a promising method for recycling polymer waste into energy-dense fuels or products without causing pollution. This study investigated the thermal degradation characteristics, kinetics, thermodynamic parameters, and volatiles of micron waste polypropylene (PP) pyrolysis in nitrogen. The results show that the thermal degradation of micron waste polypropylene is a one-step reaction with a peak and average reaction rates that decrease with heating rate. The most appropriate reaction model is determined and the kinetic parameters are larger than those of PP with larger particle sizes. The thermogravimetric curves match well with the experimental results, and the thermal degradation is found to be a non-spontaneous and endothermic reaction. The concentrations of volatiles are determined in descending order.
JOURNAL OF POLYMER SCIENCE
(2023)
Article
Materials Science, Ceramics
H. Zhou, J. Tan, Q. Dong, L. F. Ma, D. Y. Ding, S. F. Guo, Q. Li, Y. A. Chen, F. S. Pan
Summary: In this study, a micron-sized Mg85Ni5Y10 amorphous alloy was successfully prepared and its thermodynamic stability and nonisothermal crystallization kinetics were investigated. The results showed that atom rearrangement has difficulty overcoming the interaction force between Ni and Y atoms due to the low mixing enthalpy. In situ XRD analysis revealed phase separation and the formation of Mg2Ni nanocrystals during the crystallization process.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Engineering, Environmental
Boyang Tian, Fengmin Li, Yue Zhang, Shuguang Wang, Zheng Zhou, Haixiang Han, Chunhua Xu
Summary: This study demonstrates for the first time that the sulfidation process of micron-sized zero-valent iron particles occurs not only on the surface but also synchronizes throughout the entire body of the particles. Through a detailed analysis of the composition, it was revealed that the particles consist of a mixed lattice of metallic iron and iron sulfides. This work clarifies a long-standing misunderstanding about the sulfidation process on zero-valent iron particles.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Artur S. C. Rego, Carolina V. B. Marprates, Talita S. X. Silva, Joao G. Neto, Rogerio C. S. Navarro, Rodrigo F. M. Souza, Eduardo A. Brocchi
Summary: This study proposed two different approaches for kinetic modeling of sulfate thermal decomposition: a graphical method (sigmoid) and a stochastic method (particle swarm optimization - PSO). It was found that the presence of potassium sulfate decreased the decomposition temperature of aluminum sulfate, and while the results of both methods agreed to a certain extent, they did not provide the same values. The determined apparent orders and activation energies varied between the two methods, with the mixture of sulfates showing the lowest activation energy values and pure aluminum sulfate having the highest.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Environmental
Wenjuan Xue, Xiaoting Hong, Yingying Du
Summary: The research aimed to find an economical and suitable degradation pathway for complex and diverse textile wastewater. It used a novel heterogeneous electro-Fenton system with a composite anode of magnetically fixed micron zero-valent iron and a Ti/RuO2-IrO2 sheet. The investigation focused on the influences of different variables on removal efficiencies of total organic carbon and chemical oxygen demand, as well as energy consumption. The optimal operating conditions were identified and verified, achieving high removal efficiencies in 60 minutes. The interaction between pollutants and mZVI was studied, and a suitable degradation mechanism for this system was proposed.
WATER SCIENCE AND TECHNOLOGY
(2023)
Article
Thermodynamics
Bojan Jankovic, Nebojsa Manic, Mihajlo Jovic, Ivana Smiciklas
Summary: The study found that the degradation of investigated shells is significantly influenced by powder particle size and heating rate, which affect the release of CO2. Additionally, different types of shells exhibit distinct mechanisms during calcination, leading to varying CO2 concentrations that impact temperature and activation energy.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Chemistry, Multidisciplinary
Chunlei Jiang, Yinyin Zheng, Doufeng Wang, Yongping Zheng, Chengde Xie, Lei Shi, Zhipeng Liu, Yongbing Tang
Summary: Aluminum is a promising anode material for lithium-ion batteries due to its high theoretical capacity, excellent conductivity, and natural abundance. However, the insulating oxide surface layer and poor electrolyte wettability limit its capacity utilization and hinder reaction kinetics. Surface grafting of polar amino groups is an effective strategy to improve these issues. This study reveals the critical limitations and underlying mechanisms of the aluminum anode and provides insights for other metallic anodes with similar issues.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Green & Sustainable Science & Technology
Abhisek Sahoo, Komal Saini, Shweta Negi, Jitendra Kumar, Kamal K. Pant, Thallada Bhaskar
Summary: In this study, thermal pyrolysis was used to valorize Vachellia nilotica (VN). The thermal degradation of VN under non-isothermal conditions was studied using a thermogravimetric analyzer, and kinetic parameters were determined using seven isoconversional methods. The results showed that the advanced isoconversional approach had better performance than general methods. Thermodynamic analysis suggested the possibility of conversion during VN pyrolysis. Neural network modeling was employed to predict the value of d alpha/dt. The effects of temperature, heating rate, and particle size on the process performance and product yield were systematically studied and analyzed. The optimal operating parameters were determined and experimentally confirmed. The characteristics of the resulting product were determined using various analysis methods, and it was found that phenolics, furfural, and dehydroacetic acid were the main constituents in the VN pyrolysis process. The study demonstrated that VN has a high potential for thermochemical conversion for bioenergy.
Article
Thermodynamics
Nieves Barros, Cesar Perez-Cruzado, Juan Alberto Molina-Valero, Adela Martinez Calvo, Jorge Proupin, Jose Antonio Rodriguez-Anon
Summary: This study compared two different enthalpic models to calculate the enthalpy change, Gibbs energy change, and entropy change during the combustion reaction of soil organic matter. The results showed that these thermodynamic variables were influenced by soil types and the nature of the organic matter.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Chemistry, Multidisciplinary
Shanshan Zhang, Lilong Zhou, Zhengjie Li, Ali Asghar Esmailpour, Kunjie Li, Shuhuan Wang, Runjing Liu, Xiaoyan Li, Jimmy Yun
Summary: CoOx-doped micron-sized hollow MgO rods exhibit excellent catalytic performance in treating phenol wastewater, with high removal ratio and reusability.
Article
Green & Sustainable Science & Technology
Hammad Siddiqi, Subrata Biswas, Usha Kumari, V. N. V. Hima Bindu, Subhrajit Mukherjee, B. C. Meikap
Summary: This study investigated the conversion of rice stubble feedstock to thermochemical route through kinetic and thermodynamic analysis. The feedstock showed high energy potential with 47.61% carbon content and 14.43 MJ kg-1 heating value. Kinetics analysis revealed a chain initiation and propagation mechanism, along with significant kinetic compensation effect, and a fitting percentage of 69.34% was achieved between experimental data and empirical model.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Biochemistry & Molecular Biology
Ubaid Ur Rahman, Muhammad Humayun, Abbas Khan, Saima Farooq, Muhammad Sadiq, Mohamed Bououdina, Nasrullah Shah
Summary: This research focuses on the isolation and modification of cellulose for the removal of organic pollutants. The cellulose fibers collected from Olive Europa plant were purified and divided into three parts: thermally activated cellulose, chemically modified cellulose, and un-functionalized cellulose. Thermally activated cellulose showed the highest efficiency in removing the dye.
Article
Multidisciplinary Sciences
Venkat Pamidi, Shivam Trivedi, Santosh Behara, Maximilian Fichtner, M. Anji Reddy
Summary: Confining particle-electrolyte interactions to the surface of electrode materials is crucial for developing sustainable and safe batteries. Research reveals the potential of micron-sized single-crystal particles in sodium-ion batteries, showing high cycling and voltage stability, enhanced thermal stability, and relative stability in water and ambient atmosphere.
Article
Chemistry, Multidisciplinary
Pratibha Negi, Pankaj Kumar Dubey, Avinash V. Palodkar, Sanat Kumar, Ajay Kumar
Summary: This study evaluates the thermal cracking kinetics and thermodynamics of real-world waste plastics, indicating that mixed waste plastics consume significantly more energy for thermal breakdown reactions compared to other types of waste plastics. The findings are important for the production of petrochemical products using waste plastics.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Environmental Sciences
Pin Wang, Lingjun Bu, Yangtao Wu, Wangchi Ma, Shumin Zhu, Shiqing Zhou
Summary: The study investigated the degradation kinetics and transformation mechanism of ibuprofen (IBP) in the UV/H2O2 process, evaluating the impacts of various factors on the degradation process. The (OH)-O· and (NO2)-N· were found to play important roles in the degradation of IBP, with their rate constants calculated based on transition state theory. The detailed degradation pathways for IBP, including hydroxylated and keto-based products, were clarified through ultra-high-resolution mass and density functional theory calculations.
Article
Engineering, Chemical
Chao Chen, Hang Chen, Li Mo, Shenbin Xiao, Changjun Li, Ming Yang, Genserik Reniers
Summary: Fire-induced domino effect is a major threat to hazardous material storage tanks. Previous research neglected the impact of wind load on the thermal buckling behavior of tanks exposed to fire. This paper conducts a numerical simulation to analyze the synergistic effects of fire and wind loads on the thermal post-buckling behavior of storage tanks, considering wind parameters and heat radiation parameters.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2024)
Article
Engineering, Chemical
Zhang Chu, Liu Lili, Li Wei, Li Beibei, Liu Mingxing
Summary: This study predicts the fatigue life of blasting discs using a combined simulation method and measures the deformation of conventional slotted blasting discs subjected to repeated loading using a high-precision laser scanning method. A relationship model is established between deformation, loading pressure, cycle number, and change in blasting pressure. The results show that the deformation varies linearly with the cycle number and follows a power function relationship with the change in blasting pressure. The deformation can be used to accurately predict the fatigue life of blasting discs.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2024)
Article
Engineering, Chemical
Shin-Mei Ouyang, Jia-Chi Ye, Wei-Chun Chen, Yu-Jen Chen, Chin-Feng Chen
Summary: This study employed the Taguchi method and analysis of variance to investigate the factors that influence the deterioration of pyrotechnics when stored under different humidity and temperature conditions. Various experimental methods were used to study the microstructure, heat flow, and safety of the pyrotechnics. The results showed that humidity had a significant impact on the pyrotechnics, and controlling humidity could reduce the hazards associated with storing pyrotechnics.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2024)
Article
Engineering, Chemical
Bei Li, Huiqiang Liu, Heng Gao, Chi-Min Shu, Mingshu Bi
Summary: The moisture content sprayed into the dust layer in industrial sites is a main factor affecting reignition. The study found that moisture has a certain influence on the thermophysical properties of the dust layer, playing an important role in heat transfer and heat absorption processes. The results showed that as the moisture content increased, the thermal conductivity and heat sink density of the sample increased, indicating the need to have a heat sink density higher than the heat increase value to suppress ignition.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2024)
Article
Engineering, Chemical
Yue Jing, Yong Pan, Fan Yang, Dan Wei, Wenhe Wang
Summary: A comprehensive risk assessment method for the esterification process was proposed in this study. It established a comprehensive evaluation index system and utilized improved Dempster-Shafer evidence theory and cloud model for assessment. The method was validated through case studies and showed consistency with established indexes.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2024)