Article
Chemistry, Multidisciplinary
Kazutaka Shibatomi
Summary: This paper summarizes our recent efforts in the enantioselective organocatalytic synthesis of chiral halogenated compounds. The discussion includes enantioselective alpha-halogenation of aldehydes, decarboxylative chlorination of beta-keto acids, and enantioselective C-C bond formation at the trifluoromethylated prochiral carbon to yield organohalides with chlorinated, fluorinated, or trifluoromethylated chiral stereogenic centers. Common organocatalysts such as Jorgensen-Hayashi catalyst and cinchona alkaloid-derivatived catalyst were applied, and novel chiral amine catalysts were developed for these reactions. Stereospecific derivatizations of the chiral halogenated compounds via nucleophilic substitution are also discussed, resulting in the synthesis of many novel chiral compounds that have not been reported before, even as racemates.
Article
Engineering, Environmental
Xu He, Huizhong Chi, Mingrui He, Bin Zhang, Jianqiao Zhang, Da Wang, Jun Ma
Summary: Efficient simultaneous degradation and dechlorination of the photo-recalcitrant emerging disinfection byproduct 2-chlorophenol (2-CP) was achieved by vacuum-ultraviolet (VUV) system for the first time in this study. The combined action of direct photolysis and 'OH oxidation in VUV system led to a significantly higher removal efficiency for 2-CP. Moreover, the degradation rates of 2CP under both acidic and alkaline conditions were higher than that at the neutral pH in VUV system.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Deepanjan Majumdar, Dipanjali Majumdar
Summary: The concentration of dissolved aromatic and halogenated non-methane volatile organic compounds (NMVOCs) was studied in the sewage flowing through the open drainage canal network of Kolkata megacity in India. Seasonal variations were observed, with higher concentrations in the summer. Industrial sources, solvent usage, and in situ formation through microbial pathways were identified as the main contributors. The estimated dynamic load in the entire canal network was 182.2 kg in summer and 162.0 kg in the post-monsoon season. The distribution of different NMVOC species in different environmental compartments was simulated, showing varied emission patterns.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Razzagh Rahimpoor, Ali Firoozichahak, Davood Nematollahi, Saber Alizadeh, Parsa Mohammad Alizadeh, Ali Akbar Alinaghi Langari
Summary: A nickel/zinc-BTC bi-metallic metal-organic framework was used as an efficient adsorbent in a needle trap device for headspace sampling and analysis of halogenated hydrocarbons from urine samples. Optimal operating conditions and analysis parameters were determined for high sensitivity and accuracy in biological monitoring of non-metabolized halogenated hydrocarbons.
Article
Nanoscience & Nanotechnology
Kang Min Lee, Nam Sun Kim, Muhammad Numan, Jeong-Chul Kim, Hae Sung Cho, Kanghee Cho, Changbum Jo
Summary: By functionalizing aluminosilicate zeolites with methyl iodide, the negative effects of moisture on their performance can be minimized, leading to enhanced water tolerance and improved adsorption capacity for benzene. This study provides an effective strategy for tailoring the adsorption properties of zeolites for various advanced applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Analytical
Tobias Reinecke, Markus Leiminger, Alfons Jordan, Armin Wisthaler, Markus Mueller
Summary: Traditional PTR-MS is an effective method for measuring organic trace gases in air. However, recently developed ultrahigh sensitivity CIMS analyzers sacrifice unit ionization efficiency for certain analytes. This paper introduces a novel FUSION PTR-TOF 10k instrument that maintains the same universal unit response as conventional PTR-MS analyzers. It achieves high sensitivities and low detection limits, demonstrating sub-pptV detection capability.
ANALYTICAL CHEMISTRY
(2023)
Review
Agricultural Engineering
Preeti Chaturvedi, Balendu Shekher Giri, Parul Shukla, Pratima Gupta
Summary: Continuous discharge and persistence of antibiotics in aquatic ecosystems pose emerging environmental health hazards, requiring imperative actions for removal. Conventional methods like waste water treatment plants are found ineffective for recalcitrant antibiotics, necessitating consideration of alternative solutions such as bioreactors and biochar.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Shukai Liu, Zhengguo Cui, Ying Bai, Dongsheng Ding, Junshuang Yin, Rongguo Su, Keming Qu
Summary: Dissolved organic matter (DOM) is crucial in the indirect photodegradation of organic contaminants. A study on the indirect photodegradation of ofloxacin (OFX) in simulated seawater investigated the roles of DOM and environmental factors. Results showed that DOM accelerates the indirect photodegradation of OFX, with 1O2 and 3DOM* being the crucial reactive intermediates. The structure of DOM and salinity were found to affect the photodegradation rate of OFX, while pH impacted the formation of reactive intermediates and OFX structure. The presence of HCO3- increased the photodegradation rate by generating carbonate radicals (CO3-). This study provides important insights into the fate, removal, and transformation of OFX and the role of DOM in its indirect photodegradation.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Chemistry, Analytical
Yuan Tao, Luyao Jia, Honglin Qin, Ruiting Niu, Lizhen Qiao
Summary: In this study, a new magnetic ionic liquid (MIL) was designed and prepared for the enrichment and detection of four parabens in environmental water samples. The method exhibited low limits of quantification, good linearity, high recoveries, as well as good repeatability and accuracy.
ANALYTICAL METHODS
(2022)
Article
Chemistry, Analytical
Qing-Long Fu, Manabu Fujii, Akari Watanabe, Eunsang Kwon
Summary: This study developed a novel formula assignment algorithm based on isotope-labeled UHR-MS and applied it to determine the precursor molecules of halogenated disinfection byproducts. Electrophilic substitution was found to play a dominant role in chlorinated disinfection byproducts, and the formation of X-n-DBPs also involved secondary reactions.
ANALYTICAL CHEMISTRY
(2022)
Article
Green & Sustainable Science & Technology
Nan Jiang, Xiaoqi Kong, Xiaoling Lu, Bangfa Peng, Zhengyan Liu, Jie Li, Kefeng Shang, Na Lu, Yan Wu
Summary: This study focuses on the investigation of a nanosecond pulsed sliding dielectric barrier discharge (SLDBD) and its application in degrading a chlorinated VOC. The research reveals that the propagation of surface streamers is greatly influenced by the negative DC voltage applied, leading to an increase in the production of excited species and improved degradation efficiency.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Carlos H. M. Fernandes, Bianca F. Silva, Jose M. Aquino
Summary: This study investigated two different advanced oxidation processes (AOP) for treating water contaminated with emerging contaminants. The results showed that both electrochemical methods and solar-based methods were effective in oxidizing and mineralizing the contaminants.
Review
Biochemistry & Molecular Biology
Laura K. Meredith, Malak M. Tfaily
Summary: Microbial metabolomic studies have focused mainly on nonvolatile metabolites, neglecting the volatile organic compounds (VOCs) that play important roles in microbial systems. Advances in VOC detection allow real-time observation and overcome sampling limitations, leading to a more comprehensive understanding of microbial processes when integrating VOC and other 'omics approaches.
TRENDS IN MICROBIOLOGY
(2022)
Article
Engineering, Environmental
Luqman Hakim Mohd Azmi, Pavani Cherukupally, Elwin Hunter-Sellars, P. Bradley Ladewig, R. Daryl Williams
Summary: Competition for adsorption sites between atmospheric moisture and volatile organic compounds can significantly impact the VOC removal performance of metal-organic framework adsorbents like MIL-101. In this study, a vapor phase deposition of polydimethylsiloxane (PDMS) was used to create more hydrophobic MIL-101 composites, resulting in enhanced internal hydrophobicity and intact porosity. The MIL-101-PDMS composite showed superior performance in capturing toluene, exhibiting higher adsorption capacity and overall capture rate compared to pristine MIL-101, and maintaining excellent structural stability and adsorption performance after multiple sorption/desorption cycles.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Analytical
Yuko Kitamaki, Naoki Saito, Nanako Sasaki, Mariko Morita, Tomohiro Sasaki, Hideaki Miyamoto, Masahiko Numata, Toshihide Ihara
Summary: The use of a stainless-steel heating furnace in gas chromatography increased oxidation temperature to 650 degrees C, successfully oxidizing five organochlorine compounds. Analytical results of 20 hydrocarbon and organochlorine compounds showed good agreement with reference values, although further investigation was needed for three organobromine compounds with higher values.
ANALYTICAL SCIENCES
(2021)
Review
Chemistry, Physical
Zhiqi Tian, Michael Crowe, Liqin Shao, Peng Zhang, Lei Zhang, Qing Zhao, Jiajie Diao
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
(2018)
Article
Oncology
Niranga Wijesiri, Zhao Yu, Hong Tang, Peng Zhang
PHOTODIAGNOSIS AND PHOTODYNAMIC THERAPY
(2018)
Article
Biotechnology & Applied Microbiology
Peng Wang, Hong Tang, Peng Zhang
Article
Chemistry, Analytical
Rebecca N. Silva, Anjaly N. Vijayan, Emily Westbrook, Zhao Yu, Peng Zhang
ANALYTICA CHIMICA ACTA
(2019)
Article
Chemistry, Analytical
Zhao Yu, Michael F. Grasso, Hanna H. Sorensen, Peng Zhang
Article
Chemistry, Analytical
Anjaly N. Vijayan, Zhiming Liu, Haohan Zhao, Peng Zhang
ANALYTICA CHIMICA ACTA
(2019)
Article
Chemistry, Analytical
Michael E. Smith, Angela L. Stastny, John A. Lynch, Zhao Yu, Peng Zhang, William R. Heineman
ANALYTICAL CHEMISTRY
(2020)
Article
Biochemistry & Molecular Biology
Eskedar Tessema, Vijayanath Elakkat, Chiao-Fan Chiu, Jing-Hung Zheng, Ka Long Chan, Chia-Rui Shen, Peng Zhang, Norman Lu
Summary: Phospha-Michael addition is a versatile tool for the formation of P-C bonds, offering the possibility to access diverse functionalized products. The use of DMAP∙Hsac and fluorous long-chained pyridine as catalysts efficiently catalyzes the addition reactions, with high reactivity and good catalytic recovery and reusability. The easy separation of catalysts from products demonstrates the outstanding efficacy of the systems.
Article
Chemistry, Analytical
Michael E. Smith, Daniel P. Rose, Xiaoyu Cui, Angela L. Stastny, Peng Zhang, William R. Heineman
Summary: The study aimed to develop a novel, thin, and wearable visual H-2 sensor prototype for noninvasive monitoring of in vivo Mg-implant biodegradation. The sensor rapidly changes color from blue to pink upon exposure to different levels of H-2 through a chemical reaction involving nanoparticles. It has a wide concentration range suitable for monitoring Mg-alloy implant biodegradation in medical research and clinical settings.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Nathaniel M. Barker, Stephen D. Taylor, Ethan Ferguson, Jeanette A. Krause, Allen G. Oliver, William B. Connick, Peng Zhang
Summary: Solvent plays a crucial role in the recrystallization process and crystallinity of materials, controlling their stability and utility. The presence of a solvent in the crystalline lattice, such as water, significantly affects the overall stability of platinum polymorphs. These polymorphs exhibit unique vapochromic responses when exposed to various solvents.
INORGANIC CHEMISTRY
(2021)
Article
Nanoscience & Nanotechnology
Zhao Yu, Michael F. Grasso, Xiaoyu Cui, Rebecca Nogueira Silva, Peng Zhang
ACS APPLIED BIO MATERIALS
(2020)
