Article
Chemistry, Applied
Tingjun Fu, Yuhang Guo, Juan Shao, Qian Ma, Zhong Li
Summary: The acidic properties of ZSM-5 zeolites play a crucial role in determining the catalytic selectivity and stability for the conversion of light hydrocarbons to aromatics via two-step methanol reactions. Adjusting the density and types of acid sites in ZSM-5 can significantly impact the catalytic performance, with decreasing acid density and introducing low zinc loading leading to improved aromatics selectivity and extended catalytic lifetime. The addition of zinc species was found to affect catalytic stability by influencing coke coverage on acid sites rather than pore blockage, highlighting the importance of regulating acid properties in aromatization catalysts.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Physical
Yu Wang, Junze Zhao, Yunmiao Liu, Gaopeng Liu, Shunmin Ding, Yingjie Li, Jiexiang Xia, Huaming Li
Summary: This study designed and tested gold nanoparticle-modified bismuth-rich bismuth oxybromide Bi12O17Br2 nanotube composites, which achieved efficient separation and migration of carriers to convert CO2 into high value-added hydrocarbon products, demonstrating the potential of photocatalytic reduction of CO2.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Energy & Fuels
Rolf Brendel
Summary: In this study, a one-diode model is used to model concentrating solar cells with two recombination active contacts and a recombination active light absorber. The two contacts and the absorber contribute to the total series resistance and recombination current. It is found that varying the light concentration can be interpreted as iso-selectivity scaling of the cell's resistance and recombination. The optimal efficiency of the concentrator cell is determined by the maximum combined selectivity of the contacts and the absorber. Analytic formulas are derived to calculate the optimal contact areas and light concentration level for achieving an optimum efficiency. The efficiency results obtained from the analytic and numeric optimization methods agree to the expected level of accuracy.
Article
Chemistry, Multidisciplinary
Peiyu Li, Xiaoyun Dong, Ya Zhang, Xianjun Lang, Cheng Wang
Summary: This study introduces a highly crystalline azine-linked porphyrinic 2D COF (Por-HZ-COF) with a high specific surface area and chemical stability for photocatalytic applications, showing high activity and good reusability in the oxidative coupling of benzylamines under red light irradiation.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Carla Obradors, Benjamin List
Summary: The study presents a direct functionalization of azines via silylium activation, with a catalyst design that allows mild conditions and remarkable functional group tolerance in a one-pot setup.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Amit Ghosh, Laura Slappendel, Bao-Nguyen T. Nguyen, Larissa K. S. von Krbek, Tanya K. Ronson, Ana M. Castilla, Jonathan R. Nitschke
Summary: A strategy for light-powered guest release from a tetrahedral capsule was developed by introducing azobenzene units at its vertices. The tetrahedral capsule containing 12 diazo moieties at its metal-ion vertices was prepared and could undergo isomerization upon ultraviolet irradiation, leading to guest release. Cage re-assembly and guest re-uptake could be achieved by visible-light irradiation. 19F NMR study provided a detailed understanding of how switching led to guest release.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Dan Zhao, Henrik Lund, Uwe Rodemerck, David Linke, Guiyuan Jiang, Evgenii Kondratenko
Summary: The study found that the ratio of OH-/Al3+ in the solution affects the ability of Al2O3 to form defective sites, which in turn affects its activity and selectivity in propene production. Additionally, the type of reducing agent used for Al2O3 plays a key role in creating the desired defects, with CO showing higher reactivity than other agents.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Congcong Yin, Zhe Zhang, Zhenshu Si, Xiansong Shi, Yong Wang
Summary: Constructing gated ion transport channels is challenging but of great significance for various applications. In this study, a light-responsive COF with intrapore azobenzene groups is engineered for highly efficient and adjustable transport of multivalent ions. The azobenzene-tagged channels allow for customizable configuration without compromising crystallinity, and exhibit exceptional discrimination capability between monovalent and multivalent ions.
CHEMISTRY OF MATERIALS
(2022)
Article
Engineering, Chemical
William J. Box, Zihan Huang, Ruilan Guo, Michele Galizia
Summary: By studying polymer membranes with configurational free volume, it was found that the diffusion of larger molecules is increasingly hindered with increasing triptycene content. However, pure-gas and mixed-gas sorption as well as solubility-selectivity were unaffected.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Dermatology
Nadia Raison-Peyron, Denis Sasseville
Summary: Acetophenone azine, a potent allergen found in footwear with ethyl vinyl acetate foam, is likely a byproduct of reactions between additives during manufacturing. Patch testing with a concentration of 0.1% is recommended, but the compound is not currently available from suppliers. It should be included in shoe, plastics, and glues series for patch testing.
Article
Chemistry, Multidisciplinary
Daixing Wei, Yiqing Wang, Chung-Li Dong, Zhengqi Zhang, Xinyu Wang, Yu-Cheng Huang, Yuchuan Shi, Xiaoli Zhao, Jialin Wang, Ran Long, Yujie Xiong, Fan Dong, Mingtao Li, Shaohua Shen
Summary: Electrochemical CO2 reduction reaction (ECO2RR) with controlled product selectivity was achieved on Ag-Cu bimetallic surface alloys. By tuning surface compositions and applied potentials, high selectivity towards C2 hydrocarbons/alcohols (approximate to 60% FE), C1 hydrocarbons/alcohols (approximate to 41% FE), and CO (approximate to 74% FE) was obtained. The d-band center dependent on surface composition could regulate the *CO binding strengths and subsequent reaction pathways, while adjusting the applied potentials altered the energy of participated electrons, leading to controlled ECO2RR selectivity towards desired products. A predominant region map and an indicator for evaluating the thermodynamic predominance of the *CO subsequent reactions were proposed as theoretical guidance for controllable ECO2RR product selectivity over bimetallic alloys.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Engineering, Environmental
Chao Liang, Xue-Min Wang, Wei Liu, Hui-Yun Liu, Da-Wei Huang, Yuan-Zheng Zhang, Kai-Hang Zhang, Li-Sha Jiang, Yu-Yu Jia, Cheng-Gang Niu
Summary: Hydrogen peroxide (H2O2) is a crucial compound used in various applications such as industrial processes, medical disinfection, and water treatment. Graphitic carbon nitride (g-C3N4) shows promise as an alternative for photocatalytic H2O2 production due to its high redox ability, long-term stability, and adjustable electronic properties. However, the current limitations in g-C3N4-based systems include sluggish kinetics, rapid charge carrier recombination, and low H2O2 production selectivity. To overcome these challenges, functionalized g-C3N4 materials with a large surface area, fast charge carrier separation, and improved O2 adsorption and activation are expected to enhance reaction kinetics and selectivity.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Amita Singh, Gabriele Kociok-Kohn, Ratna Chauhan, Mohd Muddassir, Suresh W. Gosavi, Abhinav Kumar
Summary: Two extensively conjugated asymmetric ferrocene-appended compounds with azine spacers have been synthesized and characterized. These compounds were used as sensitizers in dye-sensitized solar cells, with one of them demonstrating better cell performance with higher J(SC), V-OC, and efficiency.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Chemistry, Organic
Nallappan Sundaravelu, Anuradha Nandy, Govindasamy Sekar
Summary: An efficient visible light-mediated photocatalyst-free C-S cross-coupling reaction has been developed for the synthesis of thiochromane derivatives through photoinduced electron transfer (PET). This methodology was further applied to the synthesis of thiochroman-4-ol via intermolecular three-component cross-coupling reaction. The reaction mechanism involves EDA complex formation, thioester cleavage, inter- or intramolecular sulfa-Michael addition, followed by aldol reaction sequence. The formation of EDA complex between aryl iodides and xanthate has been confirmed through spectroscopic experiments and DFT calculations.
Review
Chemistry, Multidisciplinary
Jing-Jing Lv, Ruonan Yin, Limin Zhou, Jun Li, Reddu Kikas, Ting Xu, Zheng-Jun Wang, Huile Jin, Xin Wang, Shun Wang
Summary: This review extends the discussion of electrocatalytic CO2 reduction reaction (eCO2RR) to the microenvironment around the electrocatalytic center and provides a comprehensive overview of recent research progress. The microenvironment is categorized based on the components relevant to electrocatalytic active sites, and the factors affecting the catalytic performance of eCO2RR are discussed. Challenges, potential solutions, and perspectives for future research are also addressed.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Komalavalli Lakshminarayanan, Amutha Parasuraman, Manawwer Alam, Naushad Ahmad, Balu Krishnakumar, Annamalai Raja, Misook Kang
Summary: The prepared HPA/alpha-Fe2O3-loaded Perlite catalyst showed efficient loading and successful synthesis of xanthenes. The protocol offers advantages of easy handling, low cost, and remarkable reusability without loss of catalytic activity over several cycles.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Chemistry, Inorganic & Nuclear
Monisha Sivanandhan, Amutha Parasuraman, Chinnasamy Surya, Komalavalli Lakshminarayanan, Balu Krishnakumar, Durai Mani, Young-Ho Ahn
Summary: An eco-friendly approach using Manihot esculenta for the synthesis of blue fluorescent carbon dots (CDs) with strong blue fluorescence and selective detection capability for Fe3+ ions has been reported. The structural, morphological, and optical properties of the prepared CDs were characterized. The CDs were found to be non-toxic and showed potential for bioimaging and fluorescence detection of heavy metal ions.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Polymer Science
Yousef Gamaan Alghamdi, Balu Krishnakumar, Maqsood Ahmad Malik, Sultan Alhayyani
Summary: A novel photocatalyst, biowaste pistachio-shell-derived activated carbon (AC)-loaded TiO2 nanocomposite (AC-TiO2), was successfully fabricated for the efficient photocatalytic degradation of toxic azo dyes and pharmaceuticals. The synthesized material exhibited enhanced photocatalytic activity and stability, making it a promising candidate for various photocatalytic applications.
Article
Chemistry, Multidisciplinary
T. M. Usha Mary, M. Swaminathan
Summary: The biodegradation of thiocyanate by free and immobilized Bacillus brevis was studied. It was found that immobilized cells had a higher rate of thiocyanate degradation. Cells on lignite carbon matrix showed higher efficiency compared to cells on alginate beads. Immobilization increased the bacteria's tolerance to the toxic chemical. Immobilized Bacillus brevis on lignite carbon achieved degradation of 100 ppm thiocyanate in 20 hours. This technique is valuable for wastewater treatment due to its reduced cost and simplicity.
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
(2022)
Article
Materials Science, Ceramics
P. J. Lloreda-Jurado, Krishnakumar Balu, Jesus Hernandez-Saz, E. Chicardi, Begona Ferrari, R. Sepulveda
Summary: This study demonstrates the excellent performance of freeze-casted foams, which can withstand multiple redox cycles at different temperatures with no degradation in performance or pore shrinkage. The addition of stearic acid as a dispersant agent/binder enhances the porous structure of the foam and promotes early reduction of the hematite phase. The incorporation of Al2O3 results in the formation of a solid solution and is correlated with the observed positive zeta potential.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
S. Ravikumar, Durai Mani, E. Chicardi, R. Sepulveda, Krishnakumar Balu, V. Pandiyan, Young -Ho Ahn
Summary: Water pollution by toxic dyes is a serious environmental problem. A new green technology using CdS/Ag nanocomposite as a photocatalyst has shown outstanding efficiency in degrading toxic dyes under ultraviolet and direct solar light.
CERAMICS INTERNATIONAL
(2023)
Article
Biotechnology & Applied Microbiology
S. Balasubramaniyan, T. M. Usha Mary, M. Swaminathan
Summary: Quinoline-containing effluent from pharmaceuticals, dyes and pesticide industries pollutes the environment and affects human health due to its toxicity and nauseating odor. Biotreatment using isolated Bacillus subtilis immobilized on activated coconut shell carbon proves to be an effective method for degrading quinoline, even at high concentrations of 300 ppm, within a shorter time period compared to free cells. The stability and recyclability of immobilized cells make them suitable for the mineralization of heterocyclic organics in wastewater.
BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY
(2023)
Article
Engineering, Chemical
Krishnakumar Balu, E. Chicardi, R. Sepulveda, Mani Durai, Fahmida Ishaque, Deepak Chauhan, Young-Ho Ahn
Summary: Photocatalysis process is an effective method for wastewater treatment and microbial disinfection. Researchers have developed a highly active material under Blue LED that can efficiently degrade dyes and antibiotics. This material also shows good stability and performance in real wastewater treatment.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Komalavalli Lakshminarayanan, Monisha Sivanandhan, Subramaniyan Ramasundaram, Tae Hwan Oh, Kinjal J. Shah, Kumaravel Saranraj, Amutha Parasuraman, Krishnakumar Balu
Summary: Niobium pentachloride functionalised perlite was used as a heterogeneous catalyst for the synthesis of pyrans. The immobilisation of NbCl5 over perlite was studied using various techniques. The catalyst showed high efficiency up to five runs and was compared to other reported catalysts. The structures of pyrans were confirmed using spectroscopic techniques.
Editorial Material
Chemistry, Inorganic & Nuclear
Krishnakumar Balu, Subramaniyan Ramasundaram, R. Sepulveda, E. Chicardi, Sakthivel Kumaravel, J. Josphin Mini, Tae Hwan Oh, Balakrishna Avula, Abilio J. F. N. Sobral
Summary: Photocatalysis is an efficient and sustainable oxidation technology for wastewater treatment. This study focuses on the development of visible light active semiconductors by grafting Fe(III) ions onto ZnO. The materials were characterized by various techniques, and Fe modification was found to slightly enhance the degradation ability of ZnO under visible light. The catalyst showed higher absorbance in the visible region and can be reused.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Review
Chemistry, Inorganic & Nuclear
Krishnakumar Balu, Selvam Kaliyamoorthy, Mani Durai, Antonio Aguiar, Margarida C. M. Sobral, I. Muthuvel, Sakthivel Kumaravel, Balakrishna Avula, Abilio J. F. N. Sobral, Young-Ho Ahn
Summary: Materials based on semiconducting oxides are widely used in catalysis, photocatalysis, and other fields. Zinc oxide (ZnO), with its catalytic and optoelectronic capabilities, is utilized in various industries. Porphyrins, biomimetic molecules, can be modified to synthesize derivatives with remarkable optoelectronic properties. The combination of porphyrins and ZnO can lead to the development of hybrid materials with enhanced optical, electronic, and chemical properties. This review aims to present the evolution of ZnO/porphyrin hybrids and future research trends in this field.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Krishnakumar Balu, Balakrishna Avula, Mani Durai, Sakthivel Kumaravel, Ernesto Chicardi, Ranier Sepulveda, Elangovan Erusappan, Imran Hasan, Young-Ho Ahn
Summary: This study focuses on the detailed structural elucidation and formation of mixed composite phases of Bi2O3/bismuth titanates modified with MOF-In2S3/CdIn2S4 materials. It has been found that this composite can be efficiently used for the electrocatalytic H-2 production reaction and the photocatalytic degradation of tetracycline. The characterization of the materials was done using XRD patterns and dark-field high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM).
Article
Materials Science, Multidisciplinary
Sakthivel Kumaravel, Mani Durai, R. Sepulveda, E. Chicardi, Saranraj Kumaravel, Myoung-Jin Kim, Krishnakumar Balu, Imran Hasan, K. Srinivasan, Young-Ho Ahn
Summary: In this study, photocatalytic bare and composite materials were synthesized using different methods, and their photocatalytic efficiencies were evaluated for dye degradation under different light conditions. The WAgGCN composite exhibited significant photocatalytic performance, as well as high chemical stability and excellent recyclability.
Article
Chemistry, Analytical
Sakthivel Kumaravel, Chandramoorthy Chandrasatheesh, Govindasamy Palanisamy, Jintae Lee, Imran Hasan, Saranraj Kumaravel, Balakrishna Avula, Uma Devi Pongiya, Krishnakumar Balu
Summary: In this study, bare g-C3N4 (GCN) and x% Ag/g-C3N4 (x% AgGCN) composite photocatalysts with various weight percentages were successfully fabricated using calcination and simple impregnation methods. The synthesized photocatalysts were analyzed to determine their properties and the 5% AgGCN composite photocatalyst showed the highest photocatalytic activity for MO dye degradation. The interaction of Ag with GCN and the localized surface plasmon resonance effect of Ag contribute to the higher photocatalytic activity of the 5% AgGCN composite catalyst.
Article
Chemistry, Multidisciplinary
Sakthivel Kumaravel, Mani Durai, Selvam Kaliyamoorthy, Saranraj Kumaravel, Chandrasatheesh Chandramoorthy, Balakrishna Avula, Imran Hasan, Myoung-Jin Kim, Krishnakumar Balu, Young-Ho Ahn
Summary: In this study, a catalytic system (3% Ru/Al-SBA-15) is developed for the efficient conversion of furfural into furfuryl alcohol under mild reaction conditions. The catalysts were characterized to understand their physical and chemical properties. The results showed high catalytic conversion and selectivity for the desired products.
