Article
Materials Science, Ceramics
Wafaa S. Abo El-Yazeed, Sohier A. El-Hakam, Reda S. Salama, Amr A. Ibrahim, Awad Ahmed
Summary: In this study, silver exchanged phosphomolybdic acid catalysts were synthesized and characterized. The results showed that the catalysts had good crystallinity, strong Lewis acidity, and weak Bronsted acidity. The prepared catalysts exhibited good catalytic activity in the synthesis 7-hydroxy-4-methyl coumarin and hydroquinone diacetate.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
W. S. Abo El-Yazeed, O. R. Hayes, Awad I. Ahmed
Summary: Phosphotungestic acid supported on mesoporous MCM-41 coated NiFe2O4 magnetic nanoparticles were prepared as efficient and recyclable heterogeneous catalysts for synthesizing coumarin and xanthene derivatives. The catalysts show advantages in easy recovery, simple preparation, high stability, good catalytic performance, short reaction time, and environmentally friendly reaction conditions.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Physical
Venkata Rao Madduluri, Mei Ying Lim, Anisah Sajidah Saud, Gaanty Pragas Maniam, Mohd Hasbi Ab Rahim
Summary: This study reports the conversion of α-cellulose to glycolic acid using molecular oxygen as an oxidant. Copper and cobalt molybdophosphoric acid catalysts were synthesized and tested for the conversion of α-cellulose and glucose into glycolic acid. The results showed that glycolic acid was the primary product with high selectivity and yield.
Article
Green & Sustainable Science & Technology
Betul Seker, Azam Khodadadi Dizaji, Volkan Balci, Alper Uzun
Summary: The study explored the performance of a mixed TPA/MCM-41 catalyst with a commercial CuO-ZnO Al2O3 catalyst in dimethyl ether synthesis through CO2 hydrogenation. By optimizing the loading and mixing ratios, a high DME synthesis rate was achieved under specific reaction conditions. The results demonstrated the potential of TPA/MCM-41 as an acid function in the catalyst mixture for efficient DME synthesis.
Article
Chemistry, Multidisciplinary
Syed A. Ali, Faisal M. Almulla, B. Rabindran Jermy, Abdullah M. Aitani, Raed H. Abudawoud, Mohammed AlAmer, Ziyauddin S. Qureshi, Thamer Mohammad, Hassan S. Alasiri
Summary: The study focuses on the synthesis and characterization of hierarchical composites of MCM-41 on zeolite Beta for catalytic conversion of heavy reformate into valuable xylenes. Systematic optimization of hierarchical pore generation was achieved by varying the strength of the alkaline solution during disintegration of zeolite Beta. The results show enhanced xylene yield and selectivity, as well as improved catalytic performance with the incorporation of a mild hydrogenation function.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Qingying Liu, Jiang Wang, Zhenxing Liu, Ruisheng Zhao, Aiju Xu, Meilin Jia
Summary: Mesoporous B-MCM-41 catalysts with varying boron content (B/Si = 0.015-0.147) were prepared using a simple hydrothermal synthesis method. The catalyst with B/Si = 0.048 exhibited favorable activity, stability, and water tolerance in the oxidative dehydrogenation of propane reaction. The active sites for ODHP were identified as the tri-coordinated B-OH species incorporated into the mesoporous silica framework.
Article
Materials Science, Ceramics
Tiago Fernandes de Oliveira, Marta Ligia Pereira da Silva, Andre Luis Lopes-Moriyama, Carlson Pereira de Souza
Summary: The study successfully prepared a novel bimetallic mesoporous material MCM-41 by incorporating niobium and tantalum into the molecular sieve structure through direct hydrothermal synthesis, and verified the successful replacement of silicon atoms by metallic cations through various characterization techniques. The catalyst demonstrated good structural order preservation and high specific surface area, making it suitable for various applications.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Chemical
Ahmad Zuhairi Abdullah, Natasha Ghazali, Peng Yong Hoo, Nor Irwin Basir
Summary: In this study, zirconia was incorporated into mesoporous MCM-41 support for the selective esterification of glycerol with fatty acid. The catalysts showed correlations between their characteristics and activity under different reaction conditions, with the precipitation method demonstrating more internal incorporation of the acidic component.
CHEMICAL ENGINEERING COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Tianyi Fu, He Ding, Jingshuang Zhang, Peng Bai, Jiafei Lyu, Xianghai Guo
Summary: Hierarchical aluminosilicate zeolites with uniform mesoporosity were successfully synthesized by one-stage crystallization under constant temperature using a novel single-head quaternary ammonium salt as mesoporogen and structure-directing agent. The zeolites exhibited outstanding catalytic activity with good reusability towards bulky aldol condensation.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Nagaraju Niluroutu, Avanish Shukla, Vishal M. Dhavale, Sreekuttan M. Unni, Santoshkumar D. Bhat
Summary: The composite membrane of sPEEK and PSSA-f-MCM-41 shows improved physio-chemical properties, reduced methanol permeability, and higher electrochemical selectivity, resulting in better DMFC performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Fatma Oguz Erdogan
Summary: In this study, low-cost activated carbons were produced from cornelian cherry stones using ultrasound-assisted chemical activation. The activated carbons showed higher CH(4)adsorption capacity compared to commercial adsorbents and zeolites.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2022)
Article
Engineering, Environmental
Alireza Lotfollahzade Moghaddam, Melanie Jane Hazlett
Summary: Environmental pollution and global warming have become urgent issues worldwide. To tackle these issues, renewable and sustainable energy resources are needed, such as dimethyl ether (DME) which can be derived from syngas and CO2. Bi-functional catalysts have been studied to directly synthesize DME and improve the efficiency compared to the conventional indirect process. Different reactors and solid acid catalysts for methanol dehydration in both direct and indirect processes have been discussed. Factors affecting the catalyst performance, such as particle size, pore structures, and preparation methods, have also been reviewed. The thermodynamically preferable direct route should be further investigated and modified to overcome the challenges posed by water and optimize operational conditions.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Nanoscience & Nanotechnology
Nadiia Roik, Lyudmila A. Belyakova, Marina O. Dziazko
Summary: MCM-41 type mesoporous silica materials with 3-aminopropyl and steroid groups were prepared using one-pot sol-gel synthesis. The introduction of cholic acid or its triethoxysilyl derivative had a positive impact on the formation of ordered mesoporous structure, increasing the surface area and narrowing the pores. The synthesized silica materials showed efficient sorption removal of sodium cholate and taurocholate, with the maximum sorption values reached at specific pH values and contact durations. The immobilization of steroid groups on the silica material enhanced the sorption ability, especially at high equilibrium concentrations, indicating its potential in hypercholesterolemia diagnostics and treatment.
APPLIED NANOSCIENCE
(2022)
Article
Engineering, Chemical
Aurelia R. O. Ferreira, Joaquin Silvestre-Albero, Martin E. Maier, Nagila M. P. S. Ricardo, Celio L. Cavalcante, F. Murilo T. Luna
Summary: In this study, biolubricants were synthesized from vegetable oils through esterification reactions using sulfonated mesoporous silica as catalyst. The sulfonic surface group on the catalyst significantly influenced the esterification reaction, and the functionalization of the catalyst led to a decrease in surface area and pore diameter. The sulfonated catalyst exhibited high conversions and selectivities.
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Lazat Krebayeva, Sapargali Konuspayev, Dmitry Murzin
Summary: The main aspects of catalytic cracking of heavy hydrocarbons on modified natural zeolite from the Shankanai deposit (Kazakhstan) with heteropoly acids are studied in this research work. The research combines systematic analysis, practical study, and scientific experiments to determine the prospects and practical importance of using modified natural zeolite in the processes of catalytic cracking of heavy hydrocarbons.
ACTA MONTANISTICA SLOVACA
(2023)
Article
Chemistry, Physical
Magesh Kannan Vijayakrishnan, Karthikeyan Palaniswamy, Jegathishkumar Ramasamy, Thanarajan Kumaresan, Karthikeyan Manoharan, Thundil Karuppa Raj Rajagopal, T. Maiyalagan, Vasanth Rajendiran Jothi, Sung-Chul Yi
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Chemistry, Physical
M. Karthikeyan, P. Karthikeyan, M. Muthukumar, V. Magesh Kannan, K. Thanarajan, T. Maiyalagan, Chae-Won Hong, Vasanth Rajendiran Jothi, Sung-Chul Yi
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Chemistry, Physical
Vasanth Rajendiran Jothi, Karuppasamy Karuppasamy, Thandavarayan Maiyalagan, Hashikaa Rajan, Chi-Young Jung, Sung Chul Yi
ADVANCED ENERGY MATERIALS
(2020)
Article
Chemistry, Physical
Seong Shin, T. Maiyalagan, Vasanth Rajendiran Jothi, Chi Young Jung, Sung Chul Yi
Summary: In this study, a 2D model was developed to predict the performance of cathode layers under different relative humidity levels by reconstructing the three-dimensional microstructure and deriving effective transport properties. The mechanism of self-humidifying MEA under different RH conditions was also demonstrated.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Review
Chemistry, Multidisciplinary
Sengeni Anantharaj, Suguru Noda, Vasanth Rajendiran Jothi, SungChul Yi, Matthias Driess, Prashanth W. Menezes
Summary: Transition metal hydroxides and their heterostructures have been identified as highly active electrocatalysts for hydrogen evolution reaction in alkaline water electrolysis. The lattice hydroxide anions in metal hydroxides enhance the catalytic activity, but their poor electronic conductivity has been a concern. Advancements in heterostructured hydroxide materials with metallic and/or semiconducting phases have overcome this limitation, making them essential for energy-efficient alkaline HER.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Maria Christy, Hashikaa Rajan, Hwawoo Lee, Iqra Rabani, Sang Man Koo, Sung Chul Yi
Summary: The ABO(3-δ)-type perovskite oxides, particularly La0.6Sr0.4CoO3-δ (LSC), have been studied as highly desirable electrocatalysts. Defect engineering and surface modification have been used to transform the performance of LSC electrodes, leading to the development of a surface-modified LSC/LDH (75/25) cathode with excellent bifunctionality. The composite shows superior oxygen reduction and evolution reaction performances, as well as stable cycle performance in alkaline media.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Chi-Young Jung, Seo-Won Choi, Won-Young Choi, Chae-Won Hong, Vasanth Rajendiran Jothi, Sung-Chul Yi
Summary: The proposed electrode architecture with infinitesimally thin ionomer deposited onto Pt using electrostatic spray deposition under hot and humid environments significantly improves mass activity, cell performance, and stability towards carbon degradation, surpassing the state-of-the-art decal-transferred electrode in a cost-effective and scalable manner, thereby paving the way for sustainable hydrogen mobility on a global scale.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Pitchiah E. Karthik, Vasanth Rajendiran Jothi, Sudhagar Pitchaimuthu, SungChul Yi, Sengeni Anantharaj
Summary: AC techniques are less commonly used in photoelectrocatalysis, but have great potential in further understanding interfaces and energy conversion reactions. Techniques like Mott-Schottky and intensity-modulated photocurrent spectroscopy can lead to advancements in the field.
Article
Chemistry, Multidisciplinary
Pitchiah Esakki Karthik, Hashikaa Rajan, Vasanth Rajendiran Jothi, Min Jae Ko, Sung Chul Yi
Summary: This study investigates the enhanced oxygen evolution reaction behavior of a CoSe electrode under hydrogen-induced embrittlement. Results from linear sweep voltammetry, impedance analysis, and Tafel analysis support the higher activity of the hydrogen-embrittled CoSe electrode. High-resolution transmission electron microscopy confirms the diffusion of hydrogen into the metal lattice.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Materials Science, Ceramics
Jung-Hun Yoo, T. Maiyalagan, Sung Chul Yi
Summary: In the electronics sector, miniaturization is driving technological advancements, but thermal management remains a crucial issue. This study proposes an advanced thermal filler material synthesized from hexagonal boron nitride, which effectively dissipates heat and prevents temperature overloads. The fabricated thin composite sheet exhibits high thermal conductivity and mechanical integrity, making it suitable for high-power electrical devices.
CERAMICS INTERNATIONAL
(2022)
Article
Environmental Sciences
JuHyun Lee, Sung Chul Yi
Summary: The study evaluated the effects of deposited gypsum residues on the surrounding environment and radiation exposure in plants and animals. The impact of radiation on the environment due to the phosphogypsum stockyard was found to be negligible, but the estimated dose rate of shrubs at the interface of the stockyard was 45 mu Gy h(-1). The findings contribute to understanding the radiological impact of waste storage and disposal on the environment and biota, and to developing sustainable operations and pollution monitoring policies.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2023)
Article
Chemistry, Analytical
JuHyun Lee, Sung-Chul Yi
Summary: Borate fusion pretreatment is a convenient and efficient method for decomposing NORM samples. In order to determine the concentrations of U and Th by ICP-MS, different separation methods were explored and compared. The resin separation method effectively eliminated matrix effects, the Fe coprecipitation method was the simplest to perform, and the PEG method demonstrated excellent ability to remove Si from certain samples. This study provides valuable insights for selecting the most suitable matrix removal method for ICP-MS analysis based on the type of NORM sample.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2023)
Article
Chemistry, Physical
Hashikaa Rajan, Sengeni Anantharaj, Jin-Kuk Kim, Min Jae Ko, Sung Chul Yi
Summary: The major issue with alkaline hydrogen evolution reaction (HER) is the poor kinetics resulting from water dissociation and discharge of protons. In this study, we developed a trimetallic catalyst (CoMoRu/CC) to overcome these issues. The Co component promoted water dissociation, while the Ru component efficiently discharged protons, resulting in H2 evolution. The Mo component assisted in the optimal bonding of H-ad to the catalytic sites and prevented Ru from getting poisoned.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Hashikaa Rajan, Maria Christy, Vasanth Rajendiran Jothi, S. Anantharaj, Sung Chul Yi
Summary: Cellulose fiber with unique morphology was used to fabricate catalytically active cobalt substrates for efficient water splitting. Cobalt-based bimetallic alloys were electrodeposited to achieve exceptional water electrolyzing catalytic activities under harsh industrial standards.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Materials Science, Multidisciplinary
Hee Ae Lee, Jae Hwa Park, Joo Hyung Lee, Seung Hoon Lee, Hyo Sang Kang, Seong Kuk Lee, Won Il Park, Sung Chul Yi
Summary: The study found that GaN surface can undergo thermal decomposition and oxidation under different thermal treatment conditions, with 900 degrees C annealing for 3 hours being the most effective in releasing internal residual stress and ensuring the best crystal quality.
ELECTRONIC MATERIALS LETTERS
(2021)
Article
Engineering, Chemical
Jiawei Hou, Shixuan Guo, Nigel Graham, Wenzheng Yu, Kening Sun, Ting Liu
Summary: A novel 2D composite membrane based on r-HGO and MXene materials was developed, demonstrating exceptional performance for water treatment in terms of permeability, pollutant rejection, and physical stability. The optimization of preparation conditions and material proportions can result in high water flux and efficient removal of pollutants.
JOURNAL OF MEMBRANE SCIENCE
(2024)
Retraction
Engineering, Chemical
Chang Liu, Jinghong Liu, Liang Zhu, Shanfu Tang, Huixin Xiong
JOURNAL OF MEMBRANE SCIENCE
(2024)
Article
Engineering, Chemical
Rui Gao, Caihong Liu, Andreia F. Faria, Qiang He, Chun Yang, Jun Ma
Summary: A novel copolymer architecture has been developed to address biofouling concerns in thin-film composite (TFC) membranes by integrating anti-fouling, bactericidal, and fouling-release functions. The multifunctional membrane demonstrates promising anti-adhesive properties, self-cleaning ability, and high flux recovery rate.
JOURNAL OF MEMBRANE SCIENCE
(2024)
Article
Engineering, Chemical
Alexander T. Bridge, Noah P. Wamble, Matthew S. Santoso, Joan F. Brennecke, Benny D. Freeman
Summary: This study demonstrates the reproducible preparation of high-flux defect-free asymmetric gas separation membranes using Cyrene(TM) as a majority dope formulation component. By adjusting the volume ratios of Cyrene(TM) and THF, as well as the concentrations of Matrimid(R) and the dry step time, optimal membrane performance is achieved.
JOURNAL OF MEMBRANE SCIENCE
(2024)
Article
Engineering, Chemical
Alessandra Imbrogno, Han Ya Lin, Babak Minofar, Andrea Iris Schaefer
Summary: In this study, a composite nanofiber membrane containing cross-linked beta-cyclodextrin-epichlorohydrin was prepared and evaluated for the removal of steroid hormones. The results showed that the membrane had high adsorption capacity and the ability to form a specific inclusion complex interaction with the hormones, indicating its potential application in hormone removal.
JOURNAL OF MEMBRANE SCIENCE
(2024)
Article
Engineering, Chemical
Bora Shin, Jaewon Shin, Yanuar Chandra Wirasembada, Ki Young Park, Jinwoo Cho
Summary: This study develops a mathematical model to estimate the initial flux of volatile fatty acids in the direct contact membrane distillation process. It identifies the parameters affecting the flux and their relationship with pH.
JOURNAL OF MEMBRANE SCIENCE
(2024)
Article
Engineering, Chemical
Yi-Jui Yeh, Jr Rong Liou, Wei Lin, Kuo-Lun Tung, Wei-Hung Chiang
Summary: This study demonstrates an effective plasma engineering method to create nitrogen-doped graphene quantum dot (NGQD)-inorganic nanocomposites for tunable molecular separation. The composite materials show high separation efficiency and controllable nanopore structures, making them potentially valuable for various applications.
JOURNAL OF MEMBRANE SCIENCE
(2024)
Article
Engineering, Chemical
Horacio Lopez-Marques, Kristofer L. Gleason, Manuel Aguilar-Vega, Rita Sulub-Sulub, J. Ehren Eichler, Hyeonji Oh, C. Buddie Mullins, Benny D. Freeman, Manish Kumar
Summary: In this study, water transport properties in Carbon Molecular Sieve (CMS) membranes were investigated. It was found that membranes synthesized at different pyrolysis temperatures exhibited varying water permeabilities. Compared to other polymeric materials, CMS membranes showed high water permeability, indicating potential for dehydration applications.
JOURNAL OF MEMBRANE SCIENCE
(2024)
Article
Engineering, Chemical
Dmitry A. Alentiev, Roman Yu. Nikiforov, Marina A. Rudakova, Danil P. Zarezin, Maxim A. Topchiy, Andrey F. Asachenko, Nikolay A. Belov, Maxim Bermeshev
Summary: A series of new norbornene-type monomers containing linear and branched substituents were synthesized, and robust thin membranes were prepared by vinyl-addition polymerization. Gas separation performance for the synthesized polymers was evaluated, and the structure of substituent side chains was found to significantly affect gas permeability and CO2 facilitated transport.
JOURNAL OF MEMBRANE SCIENCE
(2024)
Article
Engineering, Chemical
Lei Yan, Qi Zhang, Ze Zhang, Gui-Jie Li, Yi Jin, Xin-Lin Zhang, Yan-Yun Sun
Summary: In this study, a continuous, stable and fast ion transport channel was established through in-situ guided cross-linking of zinc alginate hydrogels on a porous membrane, overcoming the negative pore effect and effectively inhibiting the dendrite growth of zinc anodes and interfacial side reactions.
JOURNAL OF MEMBRANE SCIENCE
(2024)
Article
Engineering, Chemical
Yuqing Zhang, Ailing Zhang, Huiyang He, Yuting Fan, Yongjiang Li, Song Wang, Sanxi Li
Summary: The Langmuir-Blodgett self-assembly process is used to create an ordered SPEEK membrane, which enhances the proton conductivity by three times compared to conventional solution casting method.
JOURNAL OF MEMBRANE SCIENCE
(2024)
Article
Engineering, Chemical
Hasan Ismaeel, David Gibson, Eleonora Ricci, Maria Grazia De Angelis
Summary: In this study, a machine learning-based group contribution method (ML-GC) was developed to predict pure polymer parameters and successfully applied to predict gas solubility and gas solubility isotherms in glassy polymeric membranes. The model showed satisfactory performance on a small dataset, but has the potential to provide more accurate predictions for a wider range of polymers as more data becomes available.
JOURNAL OF MEMBRANE SCIENCE
(2024)
Article
Engineering, Chemical
Yi Ji, Yu Sun, Huilin Li, Qiang Fu, Yan Zhang
Summary: Previous studies have shown that vibration- or rotation-based techniques can effectively mitigate fouling during membrane filtration. However, it is difficult to incorporate these techniques with spiral wound modules (SWMs) widely used in water and wastewater treatment. This study developed a prototype membrane system to accommodate angular vibrations with a modified SWM, and experimental results showed that applying angular vibrations can effectively control algal fouling in an SWM with lower energy consumption compared to traditional methods.
JOURNAL OF MEMBRANE SCIENCE
(2024)
Article
Engineering, Chemical
Lakshmeesha Upadhayaya, Abaynesh Yihdego Gebreyohannes, Muhammad Wakil Shahzad, Usman T. Syed, Sandra L. Aristizabal, Radoslaw Gorecki, Suzana P. Nunes
Summary: Increasing temperatures worldwide pose a significant health risk, exacerbated by high humidity. Conventional air conditioners contribute heavily to carbon dioxide emissions, with dehumidification being a major factor. Membrane-based dehumidification system offers energy efficiency and non-toxic water vapor removal. This study demonstrates a membrane dehumidification system with polymeric hollow fibers coated with a green polyphenol coating, showing remarkable water vapor transport rate and selectivity. Long-term testing reveals minimal decline in vapor transport and a 4-5 times higher coefficient of performance (COP) compared to conventional dehumidifiers, making it a highly competitive, energy-saving device with reduced emissions and a smaller footprint.
JOURNAL OF MEMBRANE SCIENCE
(2024)
Article
Engineering, Chemical
Zhengzhong Zhou, Xue Zhu, Yi Yuan, Shaoqiang Wang, Xiaoshan Meng, Taoli Huhe, Qian Wang
Summary: In this study, lignin, a biomass material, was chemically modified and utilized in the interfacial polymerization process to improve the performance of nanofiltration membranes. The modified membranes showed enhanced hydrophilicity and anti-fouling properties, and the optimization of membrane pore size increased permeability. The study also demonstrated the potential application of the membranes in biogas slurry valorization.
JOURNAL OF MEMBRANE SCIENCE
(2024)
