Physical Adsorption of Charged Plastic Nanoparticles Affects Algal Photosynthesis

被引:847
作者
Bhattacharya, Priyanka [1 ,2 ]
Lin, Sijie [1 ]
Turner, James P. [1 ]
Ke, Pu Chun [1 ,2 ]
机构
[1] Clemson Univ, Lab Single Mol Biophys & Polymer Phys, Clemson, SC 29631 USA
[2] Clemson Univ, Ctr Opt Mat Sci & Engn Technol, Clemson, SC 29631 USA
基金
美国国家科学基金会;
关键词
POLYSTYRENE BEADS; IONIC-STRENGTH; MARINE; CONTAMINANTS; POLLUTION; CELLULOSE; SURFACES; DEBRIS; CELLS;
D O I
10.1021/jp1054759
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070305 [高分子化学与物理];
摘要
The physical adsorption of nanosized plastic beads onto a model cellulose film and two living algal species, Chlorella and Scenedesmus, has been studied. This adsorption has been found to ubiquitously favor positively charged over negatively charged plastic beads due to the electrostatic attraction between the beads and the cellulose constituent of the model and living systems. Such a charge preference is especially pronounced for Chlorella and Scenedesmus, whose binding with the plastic beads-also depended upon algal morphology and motility, as characterized by the Freundlich coefficients. Using a CO2 depletion assay, we show that the adsorption of plastic beads hindered algal photosynthesis, possibly through the physical blockage of light and air flow by the nanoparticles. Our ROS assay further indicated that plastic adsorption promoted algal ROS production. Such algal responses to plastic exposure may have implications on the sustainability of the aquatic food chain.
引用
收藏
页码:16556 / 16561
页数:6
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