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Mechanism analysis of heavy metal lead captured by natural-aged microplastics

Chemosphere 2020 242 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 45 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Shujing Ye, Shujing Ye, Qianmin Fu, Shujing Ye, Shujing Ye, Yuanqiang Tang, Qianmin Fu, Shujing Ye, Yuanqiang Tang Shujing Ye, Shujing Ye, Shujing Ye, Shujing Ye, Xiaofei Tan, Qianmin Fu, Lili Ma, Shujing Ye, Shujing Ye, Qianmin Fu, Xiaofei Tan, Shujing Ye, Xiaofei Tan, Shujing Ye, Shujing Ye, Yuanyuan Yang, Shujing Ye, Shujing Ye, Shujing Ye, Shujing Ye, Xiaofei Tan, Lili Ma, Qiang Chen, Xiaofei Tan, Yanling Gu, Shujing Ye, Yuanyuan Yang, Peng Zhang, Shujing Ye, Qiang Chen, Yanling Gu, Shujing Ye, Xiaofei Tan, Qiang Chen, Xiaofei Tan, Shujing Ye, Lili Ma, Yuanyuan Yang, Shujing Ye, Xiaofei Tan, Yuanqiang Tang, Yuanqiang Tang Shujing Ye, Xiaofei Tan, Xiaofei Tan, Xiaofei Tan, Yuanqiang Tang

Summary

The mechanism by which naturally aged microplastics capture lead (Pb(II)) from aqueous solution was investigated by comparing pristine and aged particles. Aged microplastics adsorbed more Pb(II) than pristine ones, with weathering-induced surface oxidation and increased oxygen-containing functional groups driving the enhanced metal capture capacity.

In this paper, the mechanism of lead (Pb(II)) captured by natural-aged microplastics in aqueous medium was explored. Compared with pristine microplastics, the natural-aged microplastics were more efficient for adsorbing Pb(II). After treated by hydrochloric acid (HCl) or sodium hydroxide (NaOH), the organic film was damaged and the adsorption efficiency decreased obviously, which proved that the organic film played an important role in Pb(II) capture. The fitting results of the isothermal adsorption model showed that this adsorption process was more in line with Langmuir model than with Freundlich model, and the maximum adsorption amount (13.60 mg/g) could also be obtained from the Langmuir model. Based on the comprehensive analysis of XRD, XPS and FTIR results, it was found that Pb(II) capture by natural-aged microplastics was mainly determined by the oxygen containing functional groups (carboxyl and hydroxyl groups) on the organic film. Besides, the measurement results of Zeta potential and pH effect showed that electrostatic interaction was mainly responsible for the Pb(II) capture process.

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