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Sorption properties of cadmium on microplastics: The common practice experiment and A two-dimensional correlation spectroscopic study
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Laboratory experiments examined how cadmium adsorbs onto microplastics of different polymer types and aging states, finding that surface chemistry and weathering significantly affect how much heavy metal the plastics can carry. This matters because microplastics contaminated with heavy metals represent a dual pollution risk when ingested by aquatic organisms.
Microplastics (MPs) that have accumulated in the environment are emerging as contaminating pollutants due to their interactions with metal ions. MPs change the migration and transformation of metal ions in the environment and afterward impact their environmental presence. Therefore, it is necessary to evaluate the interaction characteristics and mechanisms between Cdand MPs for assessing the ecological impacts of MPs. The traditional sequencing batch equilibrium test demonstrated that the sorption of Cd onto MPs was related to the type of MPs present, the pH value of the solution, the ionic strength of the participants and the presence of humic acid. The sorption dynamics and isotherm experiment illustrated that the interactions were controlled by surface sorption and distribution effects. The specific surface area and surface charge were the main factors in managing the sorption process. FTIR spectra and a 2D-COS analysis showed that different functional groups played an important role in the sorption of Cdonto MPs. The results from this work afford new insights on how MPs may play an important role in the fate and transport of heavy metals and present a new analysis method for evaluating the environmental behavior of MPs and their role in transporting other contaminants.
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Adsorption characteristics of cadmium onto microplastics from aqueous solutions
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Laboratory adsorption experiments characterized how cadmium is taken up by microplastics of different polymer types from aqueous solutions, finding adsorption capacity varied significantly with polymer chemistry, particle size, and solution conditions. The results help predict how microplastics in contaminated waterways accumulate and transport cadmium, a highly toxic heavy metal.
[Effects of Aging on the Cd Adsorption by Microplastics and the Relevant Mechanisms].
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This study examined how aging affects the ability of microplastics — including polyethylene and polystyrene — to adsorb the heavy metal cadmium. Weathered microplastics showed different adsorption behavior than virgin particles, which has implications for how microplastics transport toxic metals through aquatic environments.
Study on the Adsorption Behavior and Mechanism of Heavy Metals in Aquatic Environment before and after the Aging of Typical Microplastics
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Researchers investigated the adsorption behavior and mechanisms of heavy metals by typical microplastics before and after environmental aging, finding that aging significantly alters microplastics' surface properties and capacity to bind metals such as cadmium and lead in aquatic systems.
Evaluation of Cd Adsorption Characteristic by Microplastic Polypropylene in Aqueous Solution
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Researchers examined how microplastic polypropylene particles adsorb cadmium from aqueous solutions, finding that the plastic acts as a carrier for this toxic heavy metal. The results suggest that microplastics can accumulate cadmium in aquatic environments and potentially deliver it to organisms that ingest the particles.
Competitive adsorption of lead and cadmium onto nanoplastics with different charges: Two-dimensional correlation spectroscopy study
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Researchers investigated how nanoplastics with different surface charges compete to adsorb the heavy metals lead and cadmium, finding that negatively charged nanoplastics bound more of both metals and that lead consistently outcompeted cadmium for binding sites. These results reveal that the surface chemistry of nanoplastics shapes their capacity to carry toxic metals through the environment, with implications for combined heavy-metal and nanoplastic risk in aquatic ecosystems.
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