Article
Nanoscience & Nanotechnology
Ashish Kumar Kar, Arjun Behera, Rajendra Srivastava
Summary: The photocatalytic reductive N-formylation of nitroarenes was successfully achieved using a Pd nanoparticle-embedded nanostructured Ti-MOF catalyst under sunlight or household white light-emitting diode (LED). The high photocatalytic performance of the catalyst can be attributed to the direct contact between the Pd nanoparticles and the MOF, abundant catalytically active sites, and superior electrical conductivity. The findings of this study demonstrate the economic and sustainable catalyst design and may inspire the development of similar catalytic protocols for other industrially important chemicals.
ACS APPLIED NANO MATERIALS
(2022)
Article
Engineering, Environmental
Xue Sun, Fang Li, Zhimiao Wang, Hualiang An, Wei Xue, Xinqiang Zhao, Yanji Wang
Summary: Nitrogen-doped TiO2 was prepared and used as a support for highly dispersed AuPd nanoparticles for formic acid dehydrogenation. The N-TiO2-based catalyst showed excellent activity due to the high content of anatase TiO2, alloying effect, small size of metal particles, and enhanced interaction between AuPd and the support.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Multidisciplinary Sciences
W. Ballout, N. Sallem-Idrissi, M. Sclavons, C. Doneux, C. Bailly, T. Pardoen, P. Van Velthem
Summary: A novel environmentally friendly recycling method has been developed specifically for large carbon-fiber reinforced polymer composite panels, with efficient recycling potential demonstrated through fabrication of a new composite part. The recycled fibers retain up to 93% of performance compared to the reference, making them suitable for structural applications requiring moderate to high performances.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Bikash Sharma, Anjulika Ghosh, Manoj Kumar Dubey, Rakeshwar Bandichhor, Saibal Kumar Das
Summary: This article presents a simple procedure for N-formylation of various amines using indium(III) chloride as catalyst in acetonitrile under mild conditions. The reaction condition can also be applied for the chemoselective N-formylation of amino groups. By using o-phenylenediamines instead of mono-amines, unsubstituted 1H-benzimidazoles can also be obtained.
Article
Chemistry, Physical
Zengkun Li, Haiyan He, Xuan Wang, Chunhui Shou, Mianji Huang, Shengli Jin, Xin Du
Summary: In this work, a SiO2 @TiO2 composite nanocoating with mechanical robustness, antireflection and photocatalytic self-cleaning properties was successfully fabricated by introducing commercial Degussa P25-type titania nanoparticles (P25) and acid-catalyzed silica sol (ACSS) via a simple dip-coating strategy without any post-treatment. The optimized nanocoating exhibits high transmittance, low reflectivity, good hydrophilicity, high photocatalytic activity, and high mechanical robustness.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Environmental Sciences
Guy Didier Fanou, Mamadou Traore, Benjamin Kouassi Yao, Andrei Kanaev, Khay Chhor
Summary: A new composite photocatalyst was developed by grafting size-selected 5-nm titanium-oxo-alkoxo nanoparticles onto P25-TiO2 nanoparticles and incorporating HAP obtained by co-precipitation of salts. The photocatalytic yield was increased for the composite photocatalysts with the addition of HAP, likely due to a synergy between adsorption and photo-oxidation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Christopher O'Rourke, Andrew Mills
Summary: P25 TiO2 photoanodes exhibit lower faradaic efficiency in 0.5 M H2SO4 and higher water oxidation capability in 1 M HClO4.
Article
Chemistry, Multidisciplinary
Diedie Wang, Wanglv Lang, Wan Wang, Qizhuang Zou, Chunliang Yang, Fei Liu, Tianxiang Zhao
Summary: Copper hydride (CuH) complexes have been proposed as key intermediates in synthesis and catalysis. In this study, a highly efficient strategy for CuH-catalyzed N-methylation of aromatic and aliphatic amines was developed using paraformaldehyde and polymethylhydrosiloxane (PMHS) under mild reaction conditions. The reaction proceeded smoothly without additives to produce the corresponding N-methylated products using cyclic(alkyl)(amino)carbene (CAAC)CuH as a reaction intermediate, which resulted from a reaction between PMHS and (CAAC)CuCl.
Article
Engineering, Environmental
Nazarii Danyliuk, Tetiana Tatarchuk, Karthik Kannan, Alexander Shyichuk
Summary: Color images taken by a smartphone camera were used to estimate the rate of advanced photooxidation reaction of Direct Red 23 (DR23) azo dye as a model organic pollutant. The smartphone measurements are fully consistent with the reference spectrophotometry data. Through a two-factor experimental design, it was found that the concentration of H2O2 had the greater influence on the degradation rate of DR23 dye.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Physical
Jiaqi Tian, Lei Hou, Weizhi Xia, Zi Wang, Yusong Tu, Wei Pei, Si Zhou, Jijun Zhao
Summary: In this study, it was found through computational simulations that neutral (TiO2)(n) atomic clusters (n = 1-6) have excellent catalytic activity and selectivity in the artificial photosynthesis of converting CO2 into fuels. These clusters are able to drive catalytic reactions by harvesting solar light and selectively produce a significant amount of HCOOH products.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Shibo Yuan, Peng Bai, Yi He, Jiafa Chen, Yicheng Zhao, Yongdan Li
Summary: Photocatalytic N-formylation of amines with CO2 is achieved using a black TiO2-supported Cu photocatalyst prepared through a solvothermal method. Reduction with H-2 results in the formation of Cu nanoparticles and oxygen vacancies on the surface of the photocatalyst, enhancing the photocatalytic activity. A 100% conversion and an 81% yield of N-methylformanilide are achieved after 9 hours of radiation. The amount of NaBH4 and the pressure of CO2 significantly affect the activity and selectivity of the photocatalytic process.
JOURNAL OF CO2 UTILIZATION
(2023)
Article
Chemistry, Multidisciplinary
Hyun Ju Lee, Dong-Chang Kang, Eun-Jeong Kim, Young-Woong Suh, Dong-Pyo Kim, Haksoo Han, Hyung-Ki Min
Summary: The decomposition of formic acid over sulfated zirconia catalysts synthesized under different conditions was investigated. The sulfate species on the catalysts were characterized, and their contribution to formic acid decomposition was studied. The optimal synthesis conditions were identified.
Article
Chemistry, Applied
Marianna Bellardita, Guillermo Escolano-Casado, Leonardo Palmisano, Lorenzo Mino
Summary: Aryl aldehydes and acids are important industrial intermediates, but their synthesis often requires high temperatures and harmful solvents and oxidant agents. Heterogeneous photocatalysis using TiO2 P25 as photocatalyst in water provides a promising and environmentally friendly method for the selective oxidation of alcohols to aldehydes and acids. The selectivity of the reaction depends on the stability and adsorption of the alcohol and its products on the photocatalyst surface.
Article
Chemistry, Multidisciplinary
Dong-Chang Kang, Seung Hee Pyen, Eun-Jeong Kim, Young Woo Kim, Young-Woong Suh, Dong-Pyo Kim, Chae-Ho Shin, Hyung-Ki Min
Summary: The study investigated the dehydration of formic acid over supported phosphotungstic acid (HPW) catalysts for the production of hydrogen-free carbon monoxide (CO). The acidity of the catalysts was influenced by the type of support (SiO2, Al2O3, ZrO2, and TiO2) and HPW content (0.0-20.0 wt.%), as shown by IPA-TPD and Py-IR. The catalytic activity exhibited a volcano-type distribution with the HPW content, reaching a maximum at 15 wt.%. The catalytic activity was more closely related to the density of Bronsted acids and inversely proportional to the propylene desorption peak temperature during IPA-TPD. The presence of strongly adsorbed H2O during formic acid dehydration led to catalyst deactivation, especially at lower reaction temperatures (<230 degrees C).
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Engineering, Electrical & Electronic
Tharmakularasa Rajaramanan, G. R. A. Kumara, Dhayalan Velauthapillai, Punniamoorthy Ravirajan, Meena Senthilnanthanan
Summary: This study focuses on synthesising and characterising Ni/N co-doped P25-TiO2 nanostructure electrodes for photovoltaic application. Enhanced light absorption and improved surface roughness of Ni/N co-doped TiO2 electrode contribute to the higher performance of the fabricated DSSCs. The increase in short circuit current density (JSC) is mainly responsible for the improved power conversion efficiency (PCE) of the co-doped device.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
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.