Journal
CHEMOSPHERE
Volume 303, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.134729
Keywords
Polystyrene microplastics; Cadmium contaminated water; Nano-zerovalent iron; Phytoremediation; Removal of polystyrene microplastics
Categories
Funding
- Program for the National Natural Science Foundation of China [51879101, 51779090, 51709101, 51809090, 51809293]
- National Program for Support of Top-Notch Young Professionals of China
- National Innovative Talent Promotion Program of China
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-13R17]
- Hunan Provincial Science and Technology Plan Project [2018SK20410]
- Science and Technology Innovation Program of Hunan Province [2020RC4014, 2019GK4004]
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This study reveals the intrinsic effects of microplastics on the removal efficiency of heavy metal cadmium and explores the mechanisms of polystyrene microplastics entering plant roots.
Microplastics, as emerging contaminants, have attracted widespread attention for their increasing detection frequency in aquatic environment. It has been reported that microplastics may co-presence with heavy metals in water, which might have impact on heavy metals removal in water. Furthermore, the effects of microplastics on the co-remediation efficiency of plants with engineered nanomaterials are ambiguous. To this end, this study was dedicated to unveil the intrinsic effects of polystyrene microplastics (PSMPs) on the cadmium (Cd) removal efficiency by co-remediation of ryegrass (Lolium perenne L.) and three engineered nanomaterials, respectively were nano-zerovalent iron (nZVI), carboxymethylcellulose-modified-nZVI (C-nZVI) and sulfidated nZVI (S-nZVI). Significant changes were observed in Cd content, plant biomass, chlorophyll b and antioxidant enzymes. It was surprising to find that with the treatment of nZVI or C-nZVI, polystyrene microplastics would enter plants roots, and these plants were found to contain more Cd among all series. Accordingly, four possible mechanisms were proposed to explain why plants that observed the internalization of PSMPs contained more Cd. This work reveals the impact of coexisting microplastics in water on Cd remediation efficiency and provides new insights into the entry of polystyrene microplastics into plant roots.
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