Article
Engineering, Environmental
Qianqian Hu, Yifan Liu, Weian Li, Yanqi Wang, Wenhua Liao, Hanxun Zou, Jianrong Li, Xiaoying Huang
Summary: This study presents a facile and environmentally friendly method for synthesizing C, N co-doped mesoporous TiO2 nanocrystals, using IL-assisted microwave synthesis, resulting in small-sized TiO2 with well-developed mesoporous structure and abundant C, N dopants. The material exhibits high specific-surface area, excellent hydrophilicity, elevated valence-band edges, abundant defect levels, and narrowed band-gap, leading to improved visible-light absorption, reduced photogenerated electron-hole recombination, and rapid charge transfer and surface-catalyzed reactions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Applied
Huapeng Li, Bin Sun, Tingting Gao, Huan Li, Yongqiang Ren, Guowei Zhou
Summary: This study presents a mesoporous TiO2/Ti3C2 composite based on MXene nanoparticles, which exhibits significantly enhanced light absorption performance and photo-induced carriers separation and transfer ability, thus boosting the photocatalytic activity. The optimized composite shows excellent efficiency in methyl orange degradation and H-2 production.
CHINESE JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Applied
Fei Zheng, Faqin Dong, Lin Zhou, Jieyu Yu, Xijie Luo, Xingyu Zhang, Zhenzhen Lv, Luman Jiang, Yuheng Chen, Mengqing Liu
Summary: Ce and C-S codoped mesoporous TiO2 nanocomposites were synthesized via a sol-gel method integrated with an evaporation-induced self-assembly approach. The synthesized samples were characterized and the results show that the codoping enhances the photocatalytic activity by narrowing the band gap, enhancing adsorption, trapping and transferring excited e-/h+ pairs, and suppressing recombination. The obtained C,S-TiO2/CeO2 materials have large specific surface areas and numerous pores, improving adsorption capability and providing mass and electron transfer channels. The photodegradation efficiency of RhB by C,S-TiO2/CeO2 is nearly 100% within 40 min, with a degradation efficiency 6.63 times that of undoped TiO2. The materials also exhibit excellent recoverability and stability.
JOURNAL OF RARE EARTHS
(2023)
Article
Environmental Sciences
Zhengyang Chen, Shui Yu, Jianping Liu, Yamei Zhang, Yuchen Wang, Jiangyi Yu, Ming Yuan, Pengchao Zhang, Wen Liu, Jiaoxia Zhang
Summary: The continuous presence of organic pollutants in industrial wastewater poses a significant threat to human health, necessitating urgent and effective treatment. Photocatalytic degradation technology, specifically the use of TiO2 photocatalysts, provides a viable solution for the removal of organic pollutants. However, the limited absorption of visible light by TiO2 hinders its full utilization. To address this issue, the study developed an environmentally friendly synthesis of Ag-coated on micro-wrinkled TiO2-based catalysts, enabling extended absorption of visible light. The synthesized C/F-Ag-TiO2 composite exhibited a significantly lower band gap energy and achieved a remarkable degradation rate under visible light, making it a promising candidate for highly efficient environmental remediation.
ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Xiuqiang Ma, Kun Hao, Yalu Dai, Liang Song, Qing Yu, Xunqian Yin, Zhongwei Wang
Summary: Nx-MT nanocatalysts exhibited enhanced photocatalytic activity due to the comprehensive effect of mesopores and N-doping. The effects of calcination temperature and N concentration on the catalyst performance were studied, and the relationship between the pore volume of Nx-MT and the catalytic reaction rate was clarified. Moreover, the turn-over number (TON) was used to evaluate the effect of the amount of nitrogen doping on the catalytic activity per active site.
Article
Environmental Sciences
Zahid Siraj, Ibrahim M. Maafa, Iqrash Shafiq, Nasir Shezad, Parveen Akhter, Wenshu Yang, Murid Hussain
Summary: In this study, titania/silica nanocomposite and mesoporous TiO2 photocatalysts were developed by using KIT-6 template via a sol-gel approach, characterized with high surface area, a greater number of accessible active sites, and enhanced light-harvesting capability. The m-TiO2 photocatalysts showed superior photocatalytic degradation efficiency compared to commercial TiO2 under UV light irradiations, attributed to the synergistic effect of anatase phase and greater accessibility of active sites. Additionally, m-TiO2 exhibited excellent recyclability with negligible loss of activity performance.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Chemistry, Physical
Wangbing Sun, Mingxuan Sun, Xianglong Meng, Yongqiang Zheng, Ziyang Li, Xiangzhi Huang, Muhammad Humayun
Summary: A series of alkynyl carbon functionalized N-TiO2 was successfully prepared by ball milling. The alkynyl carbon materials were successfully doped into N-TiO2, and the catalytic performance of alkynylated N-TiO2 for various organic dyes and NH3 production was significantly enhanced under visible light. The introduction of alkynyl carbon into semiconductor materials is a promising strategy for improving their photocatalytic properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Yuzheng Wang, Xiaoxu Wang, Laishi Li, Yusheng Wu, Qun Yu
Summary: Boron-doped titanium dioxide nanoparticles (B-TiO2 NPs) were prepared by a sol-gel method and characterized by various techniques. The experimental results demonstrate that doping boron ions can enhance the photocatalytic antibacterial performance of B-TiO2 NPs, with boron atoms mainly existing as substitutional and interstitial dopants.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Xiaotong Feng, Lifen Gu, Naiyu Wang, Qiaosheng Pu, Guangli Liu
Summary: Fe/N co-doped nano-TiO2 wrapped on mesoporous carbon spheres with a core-shell structure was designed to improve the synergy of adsorption and transfer, significantly enhancing the photocatalytic efficiency. The composite shows potential advantages in treating diverse environmental pollutants.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Inorganic & Nuclear
Manasa Sunku, Ravi Gundeboina, C. H. Shilpa Chakra, Vimala Kaniki Reddy, M. Vithal
Summary: This study presents a reliable design of a nitrogen and carbon doped CoSb2O6 photocatalyst for the efficient degradation of dye-contaminated water, showing remarkable photodegradation activities of up to 99% in 120 mins under visible light irradiation.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Elias Assayehegn, Abraha Tadese Gidey, Gebrehiwot Gebreslassie, Gebremedhin Gebremariam, Ananthakumar Solaiappan, Yonas Chebude, Esayas Alemayehu
Summary: This study successfully prepared N-doped titanium dioxide nanocrystals using a benign N-source. The annealing gas environment was found to significantly impact the crystal structure, optical properties, and photocatalytic activity of the N-TiO2 nanocrystals. The introduction of N led to improved photocatalytic performance, with the highest degradation performance achieved in air. The gas-driven synthesis of photocatalysts has practical applications in solar energy conversion systems.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Ramanujam Girija, Stella Mary, G. Balakrishnan, Sivalingam M. Mariappan, Mohamed S. Hamdy, Mohd Shkir
Summary: By co-doping titanium dioxide nanoparticles with activated charcoal and iron elements, this study achieved efficient degradation of methylene blue dye and demonstrated high photocatalytic activity.
Article
Polymer Science
Byung-Geon Park
Summary: In this study, TiO2 photocatalysts doped with metal ions and nitrogen were prepared using a sol-gel method. The N/Ni/TiO2 showed the highest photocatalytic activity and sterilization efficiency among the samples tested, due to its extended light absorption region and high optical intensity.
Article
Chemistry, Physical
Mohamed Esmat, Hamza El-Hosainy, Rafat Tahawy, Wipakorn Jevasuwan, Nao Tsunoji, Naoki Fukata, Yusuke Ide
Summary: Introducing oxygen vacancies (Vo) into TiO2 photocatalyst along with N doping is proposed as an alternative strategy for achieving efficient co-catalyst-free solar photocatalytic activity under less extreme conditions. The synthesized material exhibits good co-catalyst-free solar photocatalytic activity for hydrogen evolution via water splitting under irradiation with simulated solar light, showing higher efficiency compared to typical co-catalyst-free defective TiO2 materials. The introduced Vo is believed to play a role in facilitating charge separation and improving photocatalytic efficiency.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Materials Science, Paper & Wood
Y. H. Yoon, S. Y. Lee, J. G. Gwon, E. Vijayakumar, H. G. Lee, W. H. Lee
Summary: The effects of CNC templating and TM doping on the preparation and photocatalytic activity of TiO2 films were investigated. CNC-templated TiO2 films exhibit superior physical and crystalline properties compared to pure TiO2 films, while TM doping enhances the photocatalytic efficiency, especially with high valence cations. The study demonstrates the potential of using CNC templates and TM doping to improve TiO2 films for various applications.
Article
Engineering, Chemical
Ri Zhang, Shasha Zhang, Mengyan Ding
Summary: A thin liquid film method is proposed to evaluate sand erosion in annular flow. This method considers the direct interaction between the liquid film and gas core, as well as the entrainment and deposition of droplets. The erosion rate is calculated by considering the effects of liquid entrainment and particle velocity decay. The method is fully verified by comparing with experimental data.
Article
Engineering, Chemical
Yu Suo, Xianheng Su, Wenyuan He, Xiaofei Fu, Zhejun Pan
Summary: This research investigates the mechanical properties of sandstone-shale composite through orthogonal experimental method and discrete element simulation. The results show that different lithologies and thickness ratios can affect the strength and fracture mode of the composite rock samples.
Article
Engineering, Chemical
Maurizio Troiano, Andrea El Hassanin, Roberto Solimene, Alessia Teresa Silvestri, Fabrizio Scala, Antonino Squillace, Piero Salatino
Summary: This study investigates the potential of Fluidized Bed Finishing (FBF) for square flat AlSi10Mg specimens manufactured via Laser-Powder Bed Fusion (L-PBF) additive manufacturing technology. The results show that good finishing can be achieved using rotation-assisted tests, with a maximum reduction of surface roughness by 67%. Steel particles are found to be the most effective bed material.
Review
Engineering, Chemical
Ningbo Song, Wanzhong Yin, Jin Yao
Summary: Seawater's dissolved salts and minerals have various effects on the flotation process, including influencing the characteristics and behavior of flotation factors, as well as affecting the surface of sulfide minerals. In most cases, seawater has adverse effects on the flotation of sulfide minerals, but these effects can be mitigated by adjusting the reagents.
Article
Engineering, Chemical
Kaiqiao Wu, Shuxian Jiang, Victor Francia, Marc-Olivier Coppens
Summary: In rectangular and cylindrical annular fluidized beds, pulsating gas flow can create regular bubble patterns, overcoming challenges seen in conventional units. This study provides new opportunities for modularization of fluidized bed operations.
Article
Engineering, Chemical
Shuo Li, Huili Zhang, Jan Baeyens, Miao Yang, Zehao Li, Yimin Deng
Summary: The paper assesses the behavior of cohesive Geldart C-type particles when fluidized by air with the aid of vibration. It determines that mechanical vibration is a simple and effective method to improve the fluidity of cohesive particles during fluidization.
Article
Engineering, Chemical
Zhenfei Feng, Qingyuan Zhang, Shanpan Liang, Zhenzhou Li, Fangwen Guo, Jinxin Zhang, Ding Yuan
Summary: A new micro/mini-channel heat sink (MCHS) with a combined structure of longitudinal and transverse vortex generators is designed, using Al2O3 nanofluid as the working medium. The study explores the effects of transverse vortex generator shape and longitudinal vortex generator angle on the hydraulic and thermal characteristics, comprehensive performance, entropy generation, and exergy efficiency. The results show that the triangular transverse vortex generator improves the comprehensive performance and exergy efficiency. Combined with the longitudinal vortex generator, the MCHS achieves the best comprehensive performance, entropy generation, and exergy efficiency when the Reynolds number is 742.
Article
Engineering, Chemical
Kostas Giannis, Christoph Thon, Guoqing Yang, Arno Kwade, Carsten Schilde
Summary: This study presents a 3D convolutional neural network (3D-CNN) methodology for generating realistic 3D models of particles. The method trains on 2D projections of particle images to predict their 3D shapes, and evaluates the accuracy of the predictions using Fourier shape descriptors (FSDs). This methodology has wide applications in particle shape analysis.
Article
Engineering, Chemical
Zheng-qing Zhou, Lu-jia Chai, Yu-long Zhang, Ya-bin Wang, Ze-chen Du, Tian-yi Wang, Yu-zhe Liu
Summary: The dynamic oxidation and shell-breaking processes of aluminum nanoparticles (ANPs) during heating were studied using in situ transmission electron microscopy. The results revealed that the changes in shell thickness can be divided into three stages, and the active aluminum content of ANP decreased before shell-breaking.
Article
Engineering, Chemical
Fulei Chen, Huaqing Ma, Zihan Liu, Lianyong Zhou, Yongzhi Zhao
Summary: A particle breakage model based on the particle replacement scheme, using the polyhedral model to describe particles, is proposed in this work to accurately describe the breakage of a large number of particles. Additionally, a fast-cutting algorithm is proposed to reproduce the size distribution of progeny particles determined by the breakage model. The validation and simulation results show satisfactory accuracy, efficiency, and stability of the algorithm.
Review
Engineering, Chemical
Matteo Errigo, Christopher Windows-Yule, Massimiliano Materazzi, Dominik Werner, Paola Lettieri
Summary: Gas-solid fluidized-bed systems have advantages in terms of chemical reaction efficiency and temperature control, making them widely used in industrial applications. However, the design, scale-up, and optimization of these complex units are limited by the lack of deep physical understanding. Non-invasive and non-intrusive diagnostic techniques provide a way for researchers to study these systems without affecting the flow field or directly contacting the medium under study.
Article
Engineering, Chemical
Saeed Fateh, Mohammad Behshad Shafii, Mohammad Najafi, Cyrus Aghanajafi
Summary: Applying a magnetic field to ferrofluids alters their flow characteristics and enhances heat transfer. Through visualization and quantitative investigation, it is found that the magnetic field influences the flow patterns and velocity profiles, improving fluid mixing and vorticity magnitude.
Article
Engineering, Chemical
Lei Gao, Bingbing Wei, Xiaochuan Hu, Zaifeng Yao, Yiwen Fang, Xuejian Gao
Summary: In this study, a numerical model of sand triaxial test was established using discrete element software PFC3D, and an indoor triaxial test was conducted to calibrate the numerical model. The influence of microscopic parameters on the macroscopic mechanical response of sand was analyzed. The results showed that the friction coefficient had the greatest impact on the peak strength and residual strength of the sand's stress-strain curve, and it was positively correlated. The normal tangential stiffness ratio was negatively correlated, while the porosity and boundary flexibility stiffness had minimal influence on it.
Article
Engineering, Chemical
Xuan Liu, Jie Gong, Kai Jiang, Xiaojuan Lai, Yu Tian, Kang Zhang
Summary: This study aimed to improve the performance of lignite coal water slurries (CWSs) by synthesizing a series of three-arm amphiphilic block copolymers. By controlling the relative molecular weight, hydrophilic/hydrophobic ratio, and ionic group content, the apparent viscosity of CWSs was significantly reduced and the static stability was improved. Thermogravimetric testing and XPS analysis were conducted to reveal the mechanism behind the improved performance.
Article
Engineering, Chemical
Lanka Dinushke Weerasiri, Daniel Fabijanic, Subrat Das
Summary: Fluidization at low pressure offers significant benefits for the fine chemical industry. This study investigates the behavior of bubbles and bed expansion under low pressure conditions. It is found that lower pressure leads to larger bubbles, increased bubble quantity, and higher aspect ratio. The predictability is affected by the inhomogeneous fluidization, but low pressure fluidization can generate similar bubble sizes with lower fluidizing mass compared to atmospheric pressure.