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Brine rejection that accompanies ice formation in coastal polynyas is responsible for ventilating several globally important water masses in the Arctic and Antarctic. However, most previous studies of this process have been indirect, based on heat budget analyses or on warm-season water column inventories. Here, we present direct measurements of brine rejection and formation of North Pacific Intermediate Water in the Okhotsk Sea from moored winter observations. A steady, nearly linear salinity increase unambiguously caused by local ice formation was observed for more than a month.
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http://dx.doi.org/10.1126/science.1088692 | DOI Listing |
Front Chem
August 2025
Departamento de Ingeniería en Metalurgia, Universidad de Atacama, Copiapó, Chile.
The growing global demand for clean and sustainable energy has intensified the development of novel technologies capable of harnessing naturally available resources. Among these, blue energy, referring to the power generated from the mixing of waters with different salinities, has emerged as a promising yet underutilized source. This perspective presents a comprehensive synthesis of recent advances in electrochemical harvesting systems, with a particular focus on Mixing Entropy Batteries (MEBs) as efficient, membrane-free devices for salinity gradient energy recovery.
View Article and Find Full Text PDFMembranes (Basel)
August 2025
Institute for Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Florida 1709, South Africa.
Though the pursuit of sustainable desalination processes with high water recovery has intensified the research interest in membrane distillation (MD), the influence of module connection configuration on performance stability remains poorly explored. The current study provided a comprehensive multiparameter assessment of hollow fibre membrane modules connected in parallel and series in direct contact membrane distillation (DCMD) for the first time. The configurations were evaluated under varying process parameters such as temperature (50-70 °C), flow rates (22.
View Article and Find Full Text PDFMembranes (Basel)
July 2025
Department of Chemistry, University of Pretoria, Private Bag X20, Hartfield 0028, South Africa.
This study explores using polyvinylidene fluoride (PVDF) membranes modified with multi-walled carbon nanotubes (MWCNTs) to treat simulated and industrial brine from coal power stations. The MWCNTs were acid-treated and characterized using Fourier Transform Infrared Spectroscopy (FTIR), Raman, and nitrogen sorption at 77 K, Thermogravimetric analysis (TGA), and Transmission electron microscopy (TEM). The desired membranes were obtained by casting from a solution of N-Methyl-2-pyrrolidone, PVDF, various weight percentages of MWCNTs, and a small amount of polyvinylpyrrolidone.
View Article and Find Full Text PDFLangmuir
September 2025
School of Environment, Tsinghua University, Beijing 100084, China.
Nanofiltration (NF) has been widely adopted to accelerate lithium extraction from salar brines, addressing a pressing need in the lithium-ion battery industry. This highlights the current urgency to devise NF membranes with high Li/Mg selectivity while ensuring ease of industrial production. Herein, with acids blended into the organic phase before initiating the conventional interfacial polymerization (IP) of classic monomers, piperazine (PIP) and trimesoyl chloride, interfacial protonation of PIP during IP was implemented.
View Article and Find Full Text PDFWater Res
August 2025
School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong, 518172, PR China. Electronic address:
It is crucial to efficiently recover high value sources from seawater and salt-lake brines for global sustainable development goals. However, conventional membrane-based recovery methods face some significant challenges such as insufficient membrane performance and unclear mechanism. To address this issue, we propose a machine learning-driven framework with various models to systematically optimize nanofiltration membrane performance and then elucidate the underlying mechanism at the structure-process-performance nexus.
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