Microplastics have become a major environmental issue because of their widespread presence and tendency to adsorb heavy metals, which can have harmful effects on aquatic ecosystems and human health. The present study investigates the adsorption mechanisms of Pb and Cu ions on both pristine and artificially aged microplastics (MPs) made of polystyrene (PS) and polypropylene (PP). Furthermore, the influence of MP size on the adsorption capacity under different environmental conditions was evaluated. According to the characterization of MPs, aging leads to physical damage and an increase in the number of oxygen-containing functional groups on their surface. The experimental results highlight the significantly higher adsorption ability of smaller and aged MPs compared with that of pristine MPs for both the heavy metal ions. The pseudo-second-order equation provided a better fit for the adsorption kinetics study (R = 0.95), suggesting that chemisorption governs the rate-limiting phase in the adsorption mechanism on the MP surfaces. The concordance between the adsorption isotherm model and Freundlich model (R > 0.95) indicated a predominance of multilayer adsorption. The environmental factors such as pH, humic acid, temperature, and SO concentration significantly affected the adsorption of Pb⁺ and Cu⁺ onto PP and PS MPs. These variables play a crucial role in determining the nature of the interactions between heavy metal ions and the microplastic particles under diverse environmental conditions. Electrostatic interactions, surface complexation and van der Waals forces were identified as two factors that could either improve or diminish the metal ion adsorption capacity of MPs.
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http://dx.doi.org/10.1016/j.chemosphere.2024.143843 | DOI Listing |
BMC Plant Biol
December 2024
College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan, China.
Background: Consumption of leafy vegetables is a primary route of cadmium (Cd) exposure in the human body. Salicylic acid (SA) is a major stress signaling molecule that alleviates Cd toxicity in various plants. Our study aimed to investigate the effects of different SA concentrations on spinach growth, cadmium accumulation, and stress resistance physiology under cadmium stress (50 µmol/L).
View Article and Find Full Text PDFBMC Public Health
December 2024
Zhejiang Key Laboratory of Blood-Stasis-Toxin Syndrome, Zhejiang Engineering Research Center for "Preventive Treatment" Smart Health of Traditional Chinese Medicine, School of Basic Medical Science, Zhejiang Chinese Medical University, #548 Binwen Road, Binjiang District, Hangzhou, 310053, Zhejiang, China.
Background: Cadmium (Cd) is a very poisonous pollutant in the environment that has harmful implications on the neurological system. While high fiber intake is beneficial for mental health, it remains unknown whether the recommended basis for dietary fiber intake (DFI) (14 g/1000 kcal per day) can alleviate Cd-induced depression.
Methods: The investigation employed data from the National Health and Nutrition Examination Survey (NHANES) conducted between the years 2005 and 2020.
Environ Pollut
December 2024
School of Public Administration, Hohai University, Nanjing 211000, China; Observation Research Station of Land Ecology and Land Use in the Yangtze River Delta, Ministry of Natural Resources, Nanjing 210009, China. Electronic address:
Due to the rapid increase in industrial and urban areas, environmental pollution is increasing worldwide, which is causing unwanted changes in air, water, and soil at biological, physical, as well as chemical levels that ultimately causing the negative effects in living things because of toxic level of chromium (Cr). However, nanotechnology is capturing great interest worldwide due to their stirring applications in various fields. For this purpose, a pot experiment was conducted to examine plant growth and exo-physiology in rice (Oryza sativa L.
View Article and Find Full Text PDFJ Thromb Haemost
December 2024
Department of Orthopaedic Surgery, The Second Hospital of Anhui Medical University, Hefei, Anhui, China. Electronic address:
Background: Hemophilic arthropathy (HA) is a joint disease characterized by local iron overload, stemming from erythrocyte rupture and closely linked to synovial lesions. However, the precise molecular characteristics of clinical HA synovial samples remain to be defined.
Objectives: To gain insight into HA synovial tissue lesions, we utilized a metalloprotein strategy to compare the metal and protein spectra of HA with those of osteoarthritis (OA) and rheumatoid arthritis (RA).
Chemosphere
December 2024
National Cancer Control Institute, National Cancer Center, Goyang, Republic of Korea; Department of Cancer Control and Population Health, Graduate School of Cancer Science and Policy, National Cancer Center, Goyang, Republic of Korea. Electronic address:
Background: Insufficient evidence is available to confirm the effect of exposure to airborne metals on mental disorders, particularly among asthmatics. We aimed to investigate the effect of airborne metal exposure on mental health responses in asthmatics and the general population.
Methods: Using nationally representative cross-sectional data, a total of 47,796 adults were analyzed.
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