With the successful implementation of the Montreal Protocol on Substances that Deplete the Ozone Layer, the atmospheric abundance of ozone-depleting substances continues to decrease slowly and the Antarctic ozone hole is showing signs of recovery. However, growing emissions of unregulated short-lived anthropogenic chlorocarbons are offsetting some of these gains. Here, we report an increase in emissions from China of the industrially produced chlorocarbon, dichloromethane (CHCl). The emissions grew from 231 (213-245) Gg yr in 2011 to 628 (599-658) Gg yr in 2019, with an average annual increase of 13 (12-15) %, primarily from eastern China. The overall increase in CHCl emissions from China has the same magnitude as the global emission rise of 354 (281-427) Gg yr over the same period. If global CHCl emissions remain at 2019 levels, they could lead to a delay in Antarctic ozone recovery of around 5 years compared to a scenario with no CHCl emissions.
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http://dx.doi.org/10.1038/s41467-021-27592-y | DOI Listing |
ACS Omega
December 2024
Chemistry Department, Faculty of Science, University of Kuwait, P.O. Box 5969, Safat 13060, Kuwait.
An interesting platform for the construction of novel ,'-bis(2-(arylazo)-2-(aroyl)vinyl)ethane-1,2-diamines is reported in this work. These bis-arylazo compounds were assembled based on the reaction of ethylenediamine with various 2-arylhydrazono-3-oxopropanals in aqueous conditions under both conventional stirring and microwave conditions at ambient temperature. The factors affecting the optimization conditions were intensively practiced.
View Article and Find Full Text PDFPhys Chem Chem Phys
December 2024
School of Chemical Sciences, UM DAE Centre for Excellence in Basic Sciences, University of Mumbai, Kalina, Santacruz (E), Mumbai 400098, India.
J Environ Sci (China)
June 2025
Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems and Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China; State Key Laboratory of Marine Environmental Science and International Institute for Sustainability Science, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China.
Halocarbons play a vital role in ozone depletion and global warming, and are regulated by the Montreal Protocol (MP) and its amendments. China has been identified as an important contributor to the halocarbon emissions, but the regional sources of halocarbons in China are not yet well comprehended. To investigate the characteristics, emissions, and source profiles, this study conducted a field campaign in Xiamen, a coastal city in southeastern China.
View Article and Find Full Text PDFMembranes (Basel)
November 2024
Chemical Engineering and Renewable Resources for Sustainability (CERES), Department of Chemical Engineering, Faculty of Sciences and Technology, University of Coimbra, Pólo II, Rua Sílvio Lima, 3030-790 Coimbra, Portugal.
RSC Adv
October 2024
Department of Organic Chemistry, Faculty of Chemistry and Petroleum Sciences, Bu-Ali Sina University Hamedan Iran
Magnetic deep eutectic solvents (MDESs) are adjuvants and an emerging subclass of heterogeneous catalysts in organic transformations. Herein, choline chloride (Ch/Cl) embedded on naphthalene bis-urea-supported magnetic nanoparticles, namely, FeO@SiO@DES1, was constructed by a special approach. This compound was scrutinized and characterized by instrumental techniques such as FTIR, thermogravimetry and derivative thermogravimetry (TGA/DTG), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), elemental mapping, vibrating sample magnetometer (VSM) and X-ray diffraction (XRD) analyses.
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