Article
Chemistry, Physical
Deepmala Pareek, Asha Rolaniya, Menka Bhasin, Riya Sailani
Summary: The kinetics of the oxidation reaction of paracetamol catalyzed by ruthenium(III) chloride in the presence of N-chloro-p-toluene sulfonamide (chloramine-T) in an alkaline medium has been studied. The reaction follows second order kinetics and the presence of the catalyst suggests the occurrence of an uncatalyzed reaction in parallel. The rate of the reaction is slowed down by hydroxide ions. A plausible reaction mechanism has been proposed and the rate law has been derived to explain the experimental observations. The activation parameters have been calculated and no evidence of free radical participation has been observed.
INTERNATIONAL JOURNAL OF CHEMICAL KINETICS
(2023)
Article
Chemistry, Multidisciplinary
S. Malini, Kalyan Raj, N. Suresha, K. S. Anantharaju
Summary: This study investigates the oxidation of Donepezil using the oxidant Chloramine-T in acidic medium, revealing the kinetic characteristics, reaction mechanism, and product identification. The spectroscopic results are consistent with theoretical predictions, providing insight into the oxidative metabolic pathway of Donepezil.
Article
Materials Science, Paper & Wood
J. Tetreault, D. Vedoy, P. Begin, S. Paris Lacombe, A. -l. Dupont
Summary: This research estimated the rate of degradation of paper and developed a kinetic degradation model. The study found that the activation energy and pH had significant influences on the decay of paper, with alkaline papers and acidic papers with good printing quality being more durable.
Article
Chemistry, Physical
Goitom K. Gebremariam, Aleksandar Z. Jovanovic, Ana S. Dobrota, Natalia V. Skorodumova, Igor A. Pasti
Summary: This study demonstrates for the first time that the volcano-type relationships for hydrogen evolution are maintained across a wide range of pH values. The effects of anodic potential on hydrogen evolution over metal surfaces are discussed and can be used to tailor catalytic materials for different water electrolysis technologies.
Article
Chemistry, Physical
Chao-Yang Zhao, Ding-Wei Ji, Hao Zheng, Gu-Cheng He, Heng Liu, Yan-Cheng Hu, Qing-An Chen
Summary: This study developed a Pd-catalyzed redox divergent coupling of ketones with terpenols, controlling the oxidation states of the product by employing different additives and highlighting the practicality of the protocol with gram-scale reactions and low catalyst loading. Detailed experimental studies were also conducted to elucidate the reaction mechanism and factors influencing redox selectivity. This coupling protocol provides an important complement to known precedents in Tsuji-Trost allylation of ketones.
Article
Biochemistry & Molecular Biology
Xinhui Pan, Xiaobing Xin, Ying Mao, Xin Li, Yanan Zhao, Yidi Liu, Ke Zhang, Xiaoda Yang, Jinhui Wang
Summary: In this study, 3-benzoylisoxazolines were synthesized by reacting alkenes with various alpha-nitroketones using chloramine-T as the base. The range of alpha-nitroketones and alkenes used was extensive, producing a variety of isoxazolines and isoxazoles. The use of chloramine-T as a low-cost, easily handled, moderate base for 1,3-dipolar cycloaddition was found to be attractive.
Article
Chemistry, Multidisciplinary
Yuanhui Huang, Kyeong-Deok Seo, Deog-Su Park, Hyun Park, Yoon-Bo Shim
Summary: The study successfully synthesized a palladium sulfide nanoparticle-decorated nitrogen and sulfur doped carbon catalyst with excellent catalytic performance in acidic media. The catalyst exhibited high activity for both the hydrogen evolution and oxygen reduction reactions, outperforming Pt/C.
Article
Chemistry, Multidisciplinary
Carlos Lazaro-Milla, M. Teresa Quiros, Diego J. Cardenas, Pedro Almendros
Summary: The synthesis of skipped 1,4-enynes through functionalization of the cyclobutene core with alkynes has been achieved, indicating an unusual pathway of oxidative addition in tertiary iodoalkanes.
CHEMICAL COMMUNICATIONS
(2021)
Article
Engineering, Chemical
Shichang Yan, Wenlong Xu, Haiming He, Jiecan Shen, Yu Shi, Songsong Xu, Boqing Liu, Yiming Ma, Qingbo Xiao, Zhiyang Zhang, Mi Hu, Jinhua Liang, Xiaoqian Ren
Summary: In this study, a highly active and selective CuMgAl layered double oxide catalyst was successfully prepared and applied in the aldol condensation of acetaldehyde, achieving high conversion and selectivity. It was found that the acidity of the catalyst could be regulated by the addition of Cu species, and the number of Lewis acidic sites could be increased, ensuring high selectivity to the target product.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Chemical
Shichang Yan, Wenlong Xu, Haiming He, Jiecan Shen, Yu Shi, Songsong Xu, Boqing Liu, Yiming Ma, Qingbo Xiao, Zhiyang Zhang, Mi Hu, Jinhua Liang, Xiaoqian Ren
Summary: CuMgAlO catalyst was successfully synthesized and applied in the self-condensation of acetaldehyde. The acidity can be regulated through the addition of Cu species, resulting in enhanced selectivity and activity.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Biochemistry & Molecular Biology
Jelena Korac Jacic, Danica Bajuk-Bogdanovic, Sladana Savic, Bojana Bozic Cvijan, Ivan Spasojevic, Milica R. Milenkovic
Summary: This study investigated the interactions of hydralazine (HL) with copper ions in conditions that mimic the pH shift along the digestive tract. It was found that in acidic solution, a stable complex was formed between HL and Cu2+ ions, while at neutral pH, Cu2+ ions initiated the oxidation and degradation of HL. These results indicate that the change in pH along the digestive tract can promote HL degradation. Rating: 8/10.
JOURNAL OF INORGANIC BIOCHEMISTRY
(2023)
Article
Environmental Sciences
Hongliang Lu, Yingchao Hu, Chunquan Kang, Qinyuan Meng, Zhihua Lin
Summary: The study revealed that heavy metal exposure to cadmium interacts with different pH levels, resulting in diverse combined toxicities to the tadpoles of Zhenhai brown frog.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Microbiology
Jinxing Song, Landan Shi, Sha Wang, Yunqiu Wang, Yi Zhu, Jihong Jiang, Rongpeng Li
Summary: In this study, researchers found that the combination of acidic pH and oxidative stress can synergistically kill A. fumigatus. They also discovered that A. fumigatus is sensitive to the combination of acidic/alkaline stress and azole drugs. These findings suggest that combinatorial stress can be a powerful mechanism to combat fungal infections and may lead to novel approaches in antifungal therapy.
MICROBIOLOGY SPECTRUM
(2022)
Article
Polymer Science
Gabriel Duaux, Etienne Fleury, Daniel Portinha
Summary: This study aimed to explore the possibility of synthesizing carbohydrate polymers from Natural Bronsted Acidic Low Transition Temperature Mixtures without the use of solvents or catalysts. The results showed that by evaporating aqueous mixtures and controlling water content, it was possible to obtain liquid mixtures at room temperature and carry out polymerization reactions below the melting temperature of the monomers, resulting in thermoset polymers with high crosslink density.
Article
Nanoscience & Nanotechnology
Fei Chu, Bin Han, Kaveh Edalati, Jiang Ma, Yuying Meng, Chao Wang, Fan Yang, Peng Zhang, Huai-Jun Lin
Summary: Severe plastic deformation by high-pressure torsion on a Pd40Cu30Ni10P20 metallic glass enhances the electrocatalytic hydrogen evolution reaction in both acidic and alkaline media, attributed to the significantly increased density of flow units in the amorphous matrix.
SCRIPTA MATERIALIA
(2021)
Review
Environmental Sciences
Jinbo Liu, Chi Zhang, Hanzhong Jia, Eric Lichtfouse, Virender K. Sharma
Summary: This paper reviews the dissipation of PAHs in soils through abiotic processes such as photodegradation and oxidation. It discusses the role of soil components in degradation rates, pathways, and mechanisms, as well as the potential risks of abiotic transformations.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Yinghao Wen, Eric Lichtfouse, Virender K. Sharma, Xingmao Ma
Summary: The persistence of recalcitrant pollutants in water is a major health issue. This study investigated the effect of phosphate on the degradation of atrazine by peroxydisulfate under visible light. The presence of phosphates was found to significantly decrease the efficiency of atrazine removal, due to the formation of less reactive phosphate radicals.
ENVIRONMENTAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
V. Murugesh, Patlolla Ravinder Reddy, Surya Prakash Singh
Summary: A photocatalyst-free, visible-light promoted method for direct conversion of C(sp(2))-H to C(sp(2))-N is presented in this study. Multipurpose benzothiadiazoles are employed as model synthons and secondary amines as aminating agents. Mechanistic study reveals that the radical reaction proceeds through nitrogen-centered radical generation, followed by addition of arenes, enabling an economically efficient amination protocol for benzothiadiazole with secondary amines.
CHEMICAL COMMUNICATIONS
(2023)
Article
Biochemistry & Molecular Biology
Adam Tolgyesi, Attila Cseh, Andrea Simon, Virender K. Sharma
Summary: The study aimed to develop a method for analyzing multiple groups of food contaminants, including 266 pesticides, 12 mycotoxins, 14 alkaloid toxins, and 3 Alternaria toxins. The method used QuEChERS sample preparation and LC-MS/MS analysis under alkaline mobile phase conditions. The developed method has been successfully validated through satisfactory analyses of various quality control, proficiency test, and validation samples.
Review
Chemistry, Physical
Manpreet Kaur Ubhi, Manpreet Kaur, Jaspreet Kaur Grewal, Virender K. Sharma
Summary: This article reviews the different synthesis routes of phosphorous- and boron-doped graphene and their applications in supercapacitors, lithium-ion batteries, and electronic devices such as fuel and solar cells. The direct and post-treatment methods are discussed, with the latter offering a more stable and controllable technique that preserves the original graphene structure. The review also highlights the latest progress in using phosphorous and boron-doped graphene for energy-related applications.
Article
Chemistry, Multidisciplinary
Priksha Rana, Ganesh Udari, Balasubramanian Sridhar, Surya Prakash Singh
Summary: In this study, fullerene (C-70) is demonstrated to be an efficient photoredox catalyst for the synthesis of highly functionalized pyrrolo[2,1-a]isoquinoline compounds. C-70 exhibits excellent light harvesting capability, long triplet state lifetime, photostability, and singlet oxygen generation potential, making it an effective catalyst. Through energy transfer and single electron transfer mechanisms, C-70 promotes the formation of singlet oxygen and superoxide radicals, which further facilitate the synthesis of pyrrolo[2,1-a]isoquinolines through a tandem oxidation-deprotonation and [3+2]-cycloaddition reaction sequence. The protocol allows for the activation of various substrates, leading to the construction of a diverse library of well-decorated pyrrolo[2,1-a]isoquinolines with good functional group tolerance.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Review
Environmental Sciences
Nisha Singh, Meshal M. Abdullah, Xingmao Ma, Virender K. Sharma
Summary: The increasing use of plastic products in agriculture has led to the accumulation of microplastics and nanoplastics in agricultural soils, which raises concerns about their impact on soil health, crop productivity, and food safety. The interaction between plants, soil, and microplastics/nanoplastics can negatively affect plant growth and induce oxidative stress. However, the current knowledge about the fate and impact of microplastics/nanoplastics in the plant-soil nexus is limited, hindering further progress in this field. This review aims to address this gap by summarizing the sources, investigation techniques, impact on soil properties, accumulation in plants, and possible phytotoxicity mechanisms of microplastics/nanoplastics in agriculture.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
P. Nagarjuna, Vinay Gupta, Anirban Bagui, Surya Prakash Singh
Summary: Two molecularly engineered fullerene-based electron acceptors, BITh-C60 and BITh-C70, were synthesized and characterized. BITh-C70 showed stronger absorption and higher power conversion efficiency (PCE) compared to BITh-C60. The BHJ solar cell based on PffBT4T-2OD:BITh-C70 exhibited a flat EQE spectra of 75% from 380 to 700 nm.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2023)
Article
Engineering, Environmental
Mingzhu Liu, Nannan Wu, Xiaoyu Li, ShengNan Zhang, Virender K. Sharma, Jamaan S. Ajarem, Ahmed A. Allam, Ruijuan Qu
Summary: This study investigated the oxidation reaction of benzophenones, commonly used UV filters, by the oxidant potassium permanganate (KMnO4). The addition of potassium permanganate enhanced the reaction rate and efficiency. The degradation of benzophenones involved hydroxylation, bond breaking, polymerization, and carboxylation processes. Toxicity assessments revealed that the intermediate products formed during the degradation process posed a decreasing ecological risk.
Article
Engineering, Environmental
Cen Zhao, Luis E. Arroyo-Mora, Anthony P. DeCaprio, Dionysios D. Dionysiou, Kevin E. O. 'Shea, Virender K. Sharma
Summary: The study demonstrates the effective degradation of the cyanotoxin CYN and its model compound 6-HOMU using ferrate(VI) oxidation. The uracil ring of CYN is oxidized and cleaved, leading to the generation of nontoxic cylindrospermopsic acid. This method shows promise for the treatment of CYN and uracil-based toxins in drinking water.
Review
Chemistry, Multidisciplinary
Shengqi Zhang, Kaiting Zhang, Yuwei Xie, Yao-Yin Lou, Eric Lichtfouse, Mingbao Feng, Virender K. Sharma
Summary: The demand for clean water is increasing worldwide, but wastewater decontamination is limited by refractory organic and inorganic compounds, requiring more efficient treatment methods. This review discusses the use of ruthenium-based catalysts for polluant removal or transformation at a concentration range of 1.0-100 mg/L under acid or neutral conditions. Various catalytic oxidation and reduction methods, as well as the environmental impact of ruthenium catalysts, are examined, including electrooxidation, photocatalytic oxidation, activation of inert oxidants, hydrogen-assisted reduction, electroreduction, and N-O bond activation.
ENVIRONMENTAL CHEMISTRY LETTERS
(2023)
Article
Engineering, Environmental
Binglin Guo, Junyue Wang, Krishnamoorthy Sathiyan, Xingmao Ma, Eric Lichtfouse, Ching-Hua Huang, Virender K. Sharma
Summary: Low levels of natural organic matter (NOM) enhance removal of trimethoprim and sulfamethoxazole by ferrate(VI) through the formation of more reactive Fe(V) species. The presence of antibiotics in water sources threatens public health and ecosystems. Nine types of NOM and NOM model compounds were found to improve the removal of trimethoprim and sulfamethoxazole by ferrate(VI) under mild alkaline conditions, possibly due to the presence of phenolic moieties in NOMs. The formation of Fe(V) through single-electron transfer from NOM to Fe(VI) generates NOM radicals within milliseconds, resulting in the enhanced removal of antibiotics despite concurrent reactions between Fe(V) and NOM moieties, radicals, and water. Humic and fulvic acids from lake and river waters also showed similar results, supporting the enhanced abatement of antibiotics in real water situations.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Review
Engineering, Chemical
Poulami Mukherjee, Krishnamoorthy Sathiyan, Tomer Zidki, Mallikarjuna N. Nadagouda, Virender K. Sharma
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Untika Pengsomjit, Waleed Alahmad, Pakorn Varanusupakul, Sibel A. Ozkan, Virender K. Sharma, Charoenkwan Kraiya
Summary: This paper presents a greener methodology for determining streptomycin in honey using gel electromembrane extraction (G-EME) technique with exfoliated graphene (EG). The addition of EG enhances the extraction efficiency and sensitivity. The problem of increased electric current and electroendosmosis due to graphene-based nanomaterials is solved by tuning the acceptor phase's volume.
Review
Chemistry, Multidisciplinary
Virender K. Sharma, Xingmao Ma, Radek Zboril
Summary: Water is a crucial component of the United Nations' sustainable development goals, and water reuse is becoming increasingly accepted in response to global water scarcity. However, traditional treatment processes face challenges in treating low concentrations of pollutants in the presence of other chemicals. Advanced oxidation processes and the use of single atom catalysts offer promising solutions to these challenges.
CHEMICAL SOCIETY REVIEWS
(2023)
