Effect of TiO₂ Nanoparticle Aggregation on Marine Microalgae Isochrysis Galbana


TiO2 nanoparticles (NPs) could adversely impact aquatic ecosystems. However, the aggregation of these NPs could attenuate this effect. In this work, the biological effects of TiO2 NPs on a marine microalgae Isochrysis galbana were investigated. The aggregation kinetics of TiO2 NPs under different conditions was also investigated to determine and understand these effects. Results showed that, though TiO2 NPs had no obvious impact on the size and reproducibility of algal cells under testing conditions, they caused a negative effect on algal chlorophyll, which led to a reduction in photosynthesis. Furthermore, fast aggregation of TiO2 NPs occurred under all conditions, especially at the pH close to the pHzpc. Increasing ionic strength and NP concentration also enhanced the aggregation rate. The aggregation and the following sedimentation of TiO2 NPs reduced their adverse effects on I. galbana.


Civil, Architectural and Environmental Engineering


This research was supported by the China Scholarship Council through a State-Sponsored Scholarship Program, NSF of China (No. 21307019), the Public Science and Technology Research Fund Projects of Ocean (No. 201505034), the Zhejiang Provincial Natural Science Foundation (Nos. LY14D060007 and LQ16D060006), and National Key Research and Development Program (No. 2016YFC1402405).

Keywords and Phrases

Agglomeration; Algae; Aquatic ecosystems; Ionic strength; Microorganisms; Nanoparticles; Aggregation kinetics; Biological effects; Ecotoxicity; Isochrysis galbana; Marine microalgae; Nanoparticles (NPs); Nanoparticle aggregation; Testing conditions; Titanium dioxide; Aggregation behavior; Concentration (composition); Ecotoxicology; Microalga; Nanoparticle; pH; Pollution effect; Titanium; Algae; Isochrysis galbana; Chlorophyll; Nanoparticle; Titanium; Titanium dioxide; Haptophyta; Microalga; Osmolarity; Physiology; Toxicity; Water pollutant; Chlorophyll; Haptophyta; Microalgae; Nanoparticles; Osmolar Concentration; Titanium; Water Pollutants; Chemical; Aggregation

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Article - Journal

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© 2018 Chinese Academy of Sciences, All rights reserved.

Publication Date

01 Apr 2018

PubMed ID