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Synthesis of waterborne polyurethane-carboxymethyl chitosan cross-linked biodegradable bio-based porous materials for the adsorption of methylene blue.
Int J Biol Macromol
January 2025
State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China; Faculty of Light Industry, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
The development of green and cost-effective biomass adsorbents is necessary for removing large amounts of dyes from wastewater. In this study, polyurethane prepolymers were synthesized using polycaprolactone diol (OH-PCL-OH), isophorone diisocyanate, and 2,2-dihydroxymethylpropionic acid, which were subsequently dispersed in aqueous carboxymethyl chitosan (CMCS) solution to produce waterborne polyurethane (WPU)-CMCS porous materials. The adsorbent was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectrometer (FT-IR), thermogravimetric (TGA) and mercury intrusion porosimetry (MIP).
View Article and Find Full Text PDFEnhanced insight into the biogeochemical cycle of Hg in the Antarctic marine environment of Terra Nova Bay via isotopic analysis.
Chemosphere
January 2025
Atomic & Mass Spectrometry - A&MS Research Group, Department of Chemistry, Ghent University, Campus Sterre, Krijgslaan 281-S12, 9000, Ghent, Belgium. Electronic address:
Mercury (Hg) is a globally significant pollutant, which is particularly concerning due to its ability to undergo long-range atmospheric transport and its bioaccumulation and biomagnification in marine ecosystems, even in remote regions like Antarctica. This study explores the biogeochemical cycling of Hg in the marine coastal environment of Terra Nova Bay (Antarctica) by determining the total content of mercury (THg) and its isotopic composition in fish (Trematomus bernacchii), bivalve molluscs (Adamussium colbecki) and sediment samples, collected in 1996-1998 and 2021. Significantly lower THg concentrations are found in the organisms sampled in 2021 compared to those sampled in 1996-1998, with a concurrent shift toward higher δHg (governed by mass-dependent isotope fractionation MDF) and lower ΔHg and ΔHg (governed by mass-independent isotope fractionation MIF) values.
View Article and Find Full Text PDFThe Impact of Mercury from Dental Amalgams on Pregnancy and Childhood: A Health and Risk Assessment Evaluation.
Curr Med Chem
January 2025
Council for Nutritional and Environmental Medicine (CONEM), Mo i Rana, Norway.
Mercury is a pervasive global pollutant, with primary anthropogenic sources including mining, industrial processes, and mercury-containing products such as dental amalgams. These sources release mercury into the environment, where it accumulates in ecosystems and enters the food chain, notably through bioamplification in marine life, posing a risk to human health. Dental amalgams, widely used for over a century, serve as a significant endogenous source of inorganic mercury.
View Article and Find Full Text PDFThe detection of mercury ions (Hg) is crucial due to its harmful effects on health and environment. In this article, what we believe to be a novel dual-mode optical fiber sensor incorporating surface plasmon resonance (SPR) and surface-enhanced Raman scattering (SERS) is proposed for ultra-trace Hg detection. The sensing probe comprises gold (Au)/graphene oxide (GO) composite membrane structure and Au nanospheres (AuNPs), which are connected via double-stranded DNA.
View Article and Find Full Text PDFEffects of microorganisms, temperature and irradiation on the stability of dissolved okadaic acid and dinophysistoxin-1 in seawater.
Mar Environ Res
January 2025
College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, China.
Diarrhetic shellfish toxins (DSTs) are widespread in marine environments, posing potential threats to marine ecosystems, shellfish aquaculture, and human health. Despite their prevalence, knowledge of the stability of dissolved DSTs in seawater is still limited. This study aimed to investigate the effects of bacteria, temperature, and irradiation on the stability of dissolved okadaic acid (OA) and dinophysistoxin-1 (DTX1) in seawater.
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