Article
Chemistry, Physical
L. Savio, K. B. Bhavitha, G. Bracco, G. Luciano, D. Cavallo, G. Paolini, S. Passaglia, G. Carraro, L. Vattuone, R. Masini, M. Smerieri
Summary: The study investigates highly hydrophobic aluminium surfaces fabricated by chemical etching using Contact Angle Goniometry, Scanning Electron Microscopy, and X-ray Photoelectron Spectroscopy to correlate wettability with morphology and chemical composition. The etched aluminium surfaces exhibit binary structures with nanoscale block-like convexities and hollows, providing more space for air trapping. Results demonstrate that both hierarchical micro/nanostructures and surface composition contribute to excellent hydrophobic properties.
APPLIED SURFACE SCIENCE
(2021)
Article
Energy & Fuels
Kanghao Zheng, Wenjun Zhang, Yijiang Li, An Ping, Feng Wu, Guangyuan Xie, Wencheng Xia
Summary: In this study, a coal tar-based collector was used to remove unburned carbon (UC) from fly ash through flotation process. The adsorption mechanism of the collector on the UC particle surface was characterized, and it was found that the oxygen-containing functional groups and aromatic ring compounds in the collector significantly enhanced the floatability of UC.
Article
Chemistry, Physical
Wencheng Xia, Feng Wu, Soni Jaiswal, Yijiang Li, Yaoli Peng, Guangyuan Xie
Summary: The study demonstrated that a compound collector consisting of coal tar and diesel can effectively enhance the floatability of low rank coal by modifying the chemical and physical properties of coal surface. The compound collector increased the hydrophobicity of the coal surface, generated more flocs, and accelerated the rupture of liquid film between coal particle and bubble, resulting in improved coal floatability compared to diesel alone.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Yusheng Wang, Yijiang Li, Wencheng Xia, Yaoli Peng, Guangyuan Xie
Summary: The study demonstrated that sodium oleate effectively adsorbs on the oxidized coal surface, improving its hydrophobicity and floatability by reacting with oxygen-containing functional groups on the surface. Additionally, the combination of sodium hexametaphosphate and NaOL in oxidized coal flotation significantly reduces the ash content of clean coal.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Energy & Fuels
Jiakun Tan, Long Liang, Wencheng Xia, Yaoli Peng
Summary: This study found that fine coal particles can increase the recovery rate of coarse coal, with the effect varying depending on the density fraction and mixing ratio. By analyzing various parameters, two mechanisms were proposed to explain how fine coal particles enhance coarse coal recovery, with hydrophobic and hydrophilic particles affecting different aspects of froth stability and water drainage in the flotation process.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2021)
Article
Chemistry, Physical
Ambrish Singh, K. R. Ansari, Ismat H. Ali, Yuanhua Lin, Manilal Murmu, Priyabrata Banerjee
Summary: This study investigated the corrosion inhibition effects of two ionic liquids, 1-Butylpyridinium chloride (BPC) and 1-Butylpyridinium hexafluorophospate (BPH), on carbon steel during acidization. The weight loss results showed inhibitive performance of 90.0% for BPC and 72.5% for BPH. Electrochemical impedance spectroscopy (EIS) demonstrated that the addition of BPC and BPH increased the values of Rct, with BPC reaching a maximum of 262.4 52 cm2 and BPH reaching 125.4 52 cm2. Other tests and experiments confirmed the presence of an adsorptive layer of BPs and suggested that BPC had better inhibitive performance than BPH.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Green & Sustainable Science & Technology
Yinfei Liao, Maoyan An, Xiaodong Hao, Xingwei Song, Zhe Yang, Hourui Ren, Zechen Liu
Summary: This study investigated the feasibility of using surface functionalized polystyrene nanoparticles as collectors for low rank coal flotation. Different nanoparticles were prepared and characterized, with TFPNs and HFPNs showing significant improvement in flotation recovery compared to PNs and diesel oil. The results suggest that the surface functionalization degree plays a crucial role in enhancing the performance of nanoparticles in LRC flotation.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Energy & Fuels
Fen Xu, Shiwei Wang, Xianli Yuan, Rongjie Kong
Summary: This study investigates the influence of nonionic collectors on the flotation response of low-rank coal particles. The results show that ester surfactants such as methyl linoleate can effectively adsorb onto the surfaces of low-rank coal particles and enhance their hydrophobicity. The electron-absorption induction effect of oxygen-containing groups and large pi bonds of methyl linoleate considerably improve the wetting process on the surface of low-rank coal particles compared to dodecane. This study suggests that ester surfactants can substantially enhance the flotation response of low-rank coal.
Article
Energy & Fuels
Ankur Dwivedi, Arpita Dwivedi, Amrendra Kumar
Summary: This paper focuses on the surface properties of high-ash Indian Permian coal, which are primarily determined by its geochemical compositions. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) techniques were used to analyze the surface properties. The results confirm the presence of different elements, mineral phases, and organic functional groups in the coal. These findings are important for coal beneficiation and utilization.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2023)
Article
Mining & Mineral Processing
Fen Xu, Shiwei Wang, Rongjie Kong, Chengyong Wang
Summary: The study investigates the flotation of low-rank coal using a composite collector through a combined theoretical and experimental approach. It is found that a 3:1 mixture of dodecane and castor oil acid achieves a maximum flotation mass recovery of 82.89%. The adsorption of castor oil acid onto the coal surface enhances the hydrophobicity of the coal, improving its flotation.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Filip Ilie, Andreea-Catalina Cristescu
Summary: This study investigates the tribological properties of a lubricating oil-MoS2 nanoparticles mixture under different friction conditions. The results show that the nanoparticles form a protective and lubricating layer, significantly improving the performance of the friction pair.
Article
Engineering, Chemical
Hangil Park, Liguang Wang
Summary: This paper introduces a new sensor for real-time monitoring of coal flotation based on drag measurement, with an on-site trial in a coking coal flotation plant in Queensland, Australia demonstrating its effectiveness. The output of the sensor showed a strong linear correlation with clean coal yield, with a coefficient of determination of 0.97.
MINERALS ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Deji Jing, Xiangxi Meng, Shaocheng Ge, Tian Zhang, Mingxing Ma, Gang Wang
Summary: The structural characteristics of bituminous coal were investigated at the molecular level, revealing that aromatic compounds primarily consist of two- and three-ring structures, while aliphatic structures are mainly found in the form of methyl, ethyl side chains, and naphthenic hydrocarbons. A molecular model of bituminous coal was constructed and optimized, and the energy contribution of bond stretching and van der Waals interactions was found to be significant. These findings provide a theoretical basis for the efficient use of bituminous coal and the optimization of surfactant design.
Article
Energy & Fuels
Yijiang Li, Wencheng Xia, Ningning Zhang
Summary: This study demonstrates that using soybean oil as a collector for coal flotation can enhance coal hydrophobicity and flotation recovery. Focused beam reflectance measurement shows that the droplet size of soybean oil is smaller than that of kerosene, leading to improved dispersion and collision efficiency of coal-oil droplets in the flotation pulp.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2021)
Article
Energy & Fuels
Rensheng Li, You Zhou, Boris Albijanic, Wanlin Wang, Xiahui Gui
Summary: This study investigates the effects of salt concentration on low-rank coal modified by ionic surfactants and its adsorption mechanism. The results show that salt solution can increase the adsorption capacity of the surfactant on coal and improve coal's hydrophobicity. The optimal salt concentrations vary for different ionic surfactants.
Article
Energy & Fuels
Yuqiang Mao, Wencheng Xia, Yaoli Peng, Li Pan, Guangyuan Xie
Summary: The impacts of ultrasonic pretreatment on flotation of lignite particles of different size fractions were investigated in this study. The results showed that ultrasonic pretreatment significantly improved the combustible matter recovery of coarse particles, while decreasing the recovery of fine particles. The pretreatment caused more breakage in the 0.125-0.074 mm size fraction compared to other fractions. Additionally, ultrasonic pretreatment removed high ash minerals and reduced pore/cracks, thereby increasing the hydrophobicity and floatability of lignite.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2022)
Article
Energy & Fuels
Ngoc N. Nguyen, Vinh T. La, Chinh D. Huynh, Anh Nguyen
Summary: Carbon capture and storage (CCS) is crucial for reducing CO2 emissions and achieving climate change targets. Hydrate-based carbon capture (HBCC) is a promising and potentially competitive method, but slow kinetics and limited industrial experience present challenges for deployment.
Article
Chemistry, Physical
Cuong Nguyen, Mengsu Peng, Timothy T. Duignan, Anh Nguyen
Summary: The impact of salt ions on the adsorption of surfactants at the air-water interface was investigated. It was found that the size and charge of the ions play a critical role in the adsorption process.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Chemistry, Multidisciplinary
Pradip Singha, Nhat-Khuong Nguyen, Van Thuong Nguyen, Kamalalayam Rajan Sreejith, Du Tuan Tran, Anh Nguyen, Nam-Trung Nguyen, Chin Hong Ooi
Summary: This study utilized X-ray computerized microtomography to measure the shell thickness and effective surface tension of liquid marbles. Results showed that the preparation methods and volume of liquid marbles significantly affect the shell thickness and effective surface tension. Increasing revolution speed during liquid marble preparation results in thicker shell, while larger liquid marble volumes lead to decreased effective surface tension.
Article
Engineering, Environmental
Jiyue Sun, Rui Sun, I. Ming Chou, Anh Nguyen, Lei Jiang
Summary: Understanding the phase equilibrium of hydrogen sulfide (H2S) hydrates is important for the production and transportation of sour gas. This study measured the dissociation conditions of H2S hydrates in various electrolyte solutions and found that different electrolytes had different inhibitory effects on the formation of H2S hydrates. A thermodynamic model was also developed to predict the dissociation conditions of H2S hydrates in electrolyte solutions, and it was shown to accurately predict the dissociation conditions in aqueous NaCl, KCl, Na2SO4, and K2SO4 solutions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
An Ping, Yaoli Peng, Guangyuan Xie, Mengdie Wang, Wencheng Xia
Summary: This paper investigates the influence of surfactants on the dewatering effect of coals with different maceral contents. The results show that non-ionic surfactants have a good dewatering effect on vitrinite-rich coal, while cationic surfactants are effective for inertinite-rich coal. Additionally, surfactants reduce the hydrophobicity of the coal, increase porosity, and facilitate low-moisture product.
Article
Engineering, Chemical
Md. Tariqul Islam, Anh V. Nguyen, Asif Afzal
Summary: This study investigated the rise behavior of bubbles in shear-thinning liquid using computational fluid dynamics (CFD) modeling and artificial neural network (ANN) modeling. The results showed that the concentration of xanthan gum and the liquid flow index had a significant impact on the dynamics of bubble rise. The Carreau-Yasuda model was found to provide more accurate predictions compared to the rheological power-law model.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Article
Chemistry, Multidisciplinary
Ngoc N. Nguyen, Cuong Nguyen, Tuan A. H. Nguyen, Anh Nguyen
Summary: This paper provides a comprehensive insight into the surface science related to hydrate-based sustainable technologies. It presents molecular views of hydrate surfaces, focusing on interfacial premelting. The paper also discusses the applications of these fundamental advances in areas such as greener flow assurance, energy-efficient gas storage, carbon capture and storage, and methane recovery from natural hydrates.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Ngoc N. Nguyen, Anh Nguyen
Summary: Hydrogen and methane can be molecularly incorporated in ice-like water structures to form gas hydrates, which have the potential for gas storage. The use of porous structures as nanoreactors can effectively promote gas hydrate formation, supporting the development of gas storage technologies.
Article
Chemistry, Physical
Kangkang Sun, Cuong V Nguyen, Ngoc N Nguyen, Anh V Nguyen
Summary: This article provides a comprehensive review of the flotation separation of water-soluble salt minerals, summarizing the agreement and disagreement between experimental results and theories. The results show that the flotation of salt is strongly influenced by collectors, brine ion composition, and pH conditions, and there are some exceptional results that cannot be explained by crystal surface charge and wettability. The authors suggest that the interactions between salt ions, water molecules, collectors, and salt crystals should be considered more thoroughly, with a focus on the activity of collectors at the air-liquid interface.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2022)
Article
Energy & Fuels
Kanghao Zheng, Wenjun Zhang, Yijiang Li, An Ping, Feng Wu, Guangyuan Xie, Wencheng Xia
Summary: In this study, a coal tar-based collector was used to remove unburned carbon (UC) from fly ash through flotation process. The adsorption mechanism of the collector on the UC particle surface was characterized, and it was found that the oxygen-containing functional groups and aromatic ring compounds in the collector significantly enhanced the floatability of UC.
Article
Chemistry, Physical
Kangkang Sun, Cuong V. Nguyen, Ngoc N. Nguyen, Xiaozhen Ma, Anh V. Nguyen
Summary: Flotation of water-soluble KCl and NaCl minerals in brines is significant for K-fertilizer production, but its mechanism remains controversial. This study investigates the interaction between dissolved salt ions and collector colloids, as well as the changes in interfacial properties, to gain a molecular understanding of salt flotation. The findings suggest that ion specificity plays a crucial role in salt crystal flotation via collector colloid-crystal attraction.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Thao T. P. Nguyen, Foad Raji, Cuong V. Nguyen, Ngoc N. Nguyen, Anh V. Nguyen
Summary: Surfactants play a crucial role in controlling the macroscopic properties of the air-water interface. This study investigates the connection between the molecular structure of two ionic surfactants (DTAB and SDS) and their effects on the interfacial water molecules. The findings reveal that the different interactions and reorientations of water molecules result in variations in interfacial layer thickness, surface tension, and foam stability.
Article
Engineering, Chemical
Tariqul Islam, Anh Nguyen
Summary: Fluidization is effective in improving the separation of coarse particles. In this study, three-dimensional computational fluid dynamics (CFD) modeling is used to investigate the complex behavior of irregular coarse particle fluidization in a fluidized bed flotation cell. A modified drag model considering the particle shape factor is employed to account for the irregularity of the particles. Comparison between simulated and experimental data shows that the irregular particle drag model has a relative error of 3.9%, which is significantly better than the spherical particle drag model. The CFD model further reveals the effects of particle density and fluidization liquid velocity on bed expansion height. The fluidization behaviors of the particles in different zones of the fluidized bed flotation cell are analyzed, providing valuable insights for the flotation of coarse particles in fluidized beds.
MINERALS ENGINEERING
(2023)
Article
Engineering, Environmental
Foad Raji, Cuong V. Nguyen, Anh V. Nguyen
Summary: A new model was proposed in this study to accurately describe the adsorption of heavy metal ions on quartz surfaces and explain the surface charge reversal phenomenon. The model combines the electrical double layer theory and surface complexation and precipitation theory, and can predict the surface potential and charge reversal under different conditions. By studying the Pb(II)-quartz system, it was found that Pb(II) hydroxocomplexes played a key role in the appearance of the second surface charge reversal.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Lars odegaard Bentsen, Narada Dilp Warakagoda, Roy Stenbro, Paal Engelstad
Summary: This study investigates uncertainty modeling in wind power forecasting using different parametric and non-parametric methods. Johnson's SU distribution is found to outperform Gaussian distributions in predicting wind power. This research contributes to the literature by introducing Johnson's SU distribution as a candidate for probabilistic wind forecasting.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Xing Liu, Qiuchen Wang, Yunhao Wen, Long Li, Xinfang Zhang, Yi Wang
Summary: This study analyzes the characteristics of process parameters in three lean gas ethane recovery processes and establishes a prediction and multiobjective optimization model for ethane recovery and system energy consumption. A new method for comparing ethane recovery processes for lean gas is proposed, and the addition of extra coolers improves the ethane recovery. The support vector regression model based on grey wolf optimization demonstrates the highest prediction accuracy, and the multiobjective multiverse optimization algorithm shows the best optimization performance and diversity in the solutions.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Cairong Song, Haidong Yang, Xian-Bing Meng, Pan Yang, Jianyang Cai, Hao Bao, Kangkang Xu
Summary: The paper proposes a novel deep learning-based prediction framework, aTCN-LSTM, for accurate cooling load predictions. The framework utilizes a gate-controlled multi-head temporal convolutional network and a sparse probabilistic self-attention mechanism with a bidirectional long short-term memory network to capture both temporal and long-term dependencies in the cooling load sequences. Experimental results demonstrate the effectiveness and superiority of the proposed method, which can serve as an effective guide for HVAC chiller scheduling and demand management initiatives.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Zhe Chen, Xiaojing Li, Xianli Xia, Jizhou Zhang
Summary: This study uses survey data from the Loess Plateau in China to evaluate the impact of social interaction on the adoption of soil and water conservation (SWC) technology by farmers. The study finds that social interaction increases the likelihood of farmers adopting SWC, and internet use moderates this effect. The positive impact of social interaction on SWC adoption is more pronounced for farmers in larger villages and those who join cooperative societies.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Chenghua Zhang, Yunfei Yan, Kaiming Shen, Zongguo Xue, Jingxiang You, Yonghong Wu, Ziqiang He
Summary: This paper reports a novel method that significantly improves combustion performance, including heat transfer enhancement under steady-state conditions and adaptive stable flame regulation under velocity sudden increase.
JOURNAL OF CLEANER PRODUCTION
(2024)
