We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Investigation of Factors Affecting Metal Ion Desorption from the Surface of Microplastics
Summary
Laboratory experiments show that key environmental variables — pH, temperature, contact time, and polymer type — strongly influence how quickly metal ions desorb from microplastic surfaces into water. Because microplastics can concentrate and then release metals like lead and cadmium into food and drinking water, understanding these desorption parameters is critical for assessing the chemical hazard that microplastics pose beyond their physical presence.
MicroPlastics (MPs) are plastic materials of micro-size dimension, often between the ranges of 1μm to 5mm. MPs are potential carriers that can adsorb metal ions in aquatic environments due to their specific surface areas. MPs and their associated contaminants can reach humans in many ways and are found in drinking water sources, foods, and beverages. The metal ions associated with MPs on their surfaces can desorb into the food materials and enter humans. The current research investigates the physicochemical parameters (pH, temperature, time, and type of plastic) affecting the desorption of metal ions from MPs into aqueous solutions using Inductively Coupled Plasma-Mass-Spectrometry (ICPMS). The MP surface characterization was studied using Fourier Transform Infrared (FT-IR) spectroscopy, X-Ray Diffraction (XRD), and The Brunauer-Emmett-Teller (BET) analysis. An experiment was conducted on three metal ions Lead, Cadmium, and Chromium on PET (polyethylene terephthalate), PP (polypropylene), PS (polystyrene), and PVC (polyvinyl chloride). In this work, PP showed the highest desorption efficiency, while PVC was the lowest one. Acidic pH 3.0 favored the desorption process and with an increase in temperature and time of contact with metal ions, the desorption efficiency also increased. The Scanning Electron Microscopic (SEM) characterization of MPs disclosed the presence of wrinkles and pits which encouraged both adsorption and desorption. The BET analysis revealed the role of high specific surface area (10.6±0.3 m2/g) and higher total pore volume (Vtotal) 1.58±0.09 cm3/g in significant adsorption and desorption of metal ions on PP. The study findings provide a better perception of the desorbing efficiency of metal ions in the surrounding environment and the optimal conditions favoring this process.
Sign in to start a discussion.
More Papers Like This
Metal adsorption by microplastics in aquatic environments under controlled conditions: exposure time, pH and salinity
Scientists systematically varied pH, salinity, and exposure time during metal adsorption experiments on different microplastic types, finding that pH had the greatest influence on metal uptake, with higher pH favoring adsorption of copper, lead, and cadmium onto most tested polymers.
Study on the Adsorption Behavior and Mechanism of Heavy Metals in Aquatic Environment before and after the Aging of Typical Microplastics
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.
Adsorption mechanism of cadmium on microplastics and their desorption behavior in sediment and gut environments: The roles of water pH, lead ions, natural organic matter and phenanthrene
Researchers compared how cadmium adsorbs onto five different microplastic types and then desorbs in simulated sediment and gut environments, finding that pH, competing ions, natural organic matter, and co-pollutants like phenanthrene all significantly alter how much cadmium is released.
Microplastics as a vehicle of heavy metals in aquatic environments: A review of adsorption factors, mechanisms, and biological effects
This review summarizes how microplastics in water can absorb and carry toxic heavy metals like lead and cadmium, making them more dangerous to aquatic life than either pollutant alone. Environmental factors such as water acidity, salinity, and organic matter influence how much metal sticks to microplastic surfaces. Since contaminated seafood is a major source of human exposure, understanding these interactions is important for assessing health risks.
Adsorption and Desorption Behavior of Microplastics on Copper Ions in Aqueous Solution
This study investigated how microplastics of different types and surface chemistry adsorb and release copper ions in water. The findings show that microplastics can pick up and later release heavy metals depending on environmental conditions, acting as vectors that transport toxic metals through aquatic ecosystems.