title: Study the toxicity to Microcystis aeruginosa induced by TiO₂ nanoparticles photocatalysis under UV light.
abstract: In the present study, the biological effect of TiO2 nanoparticles on cyanobacteria cells was studied using Microcystis aeruginosa (M. aeruginosa) as a model. Nano-TiO2 as a photo-catalysts agent used for water treatment may pose a risk to ecosystems, especially for the water organisms such as cyanobacteria. Scanning electron microscope (SEM) images provided that with the increasing of photocatalytic time, slime layer on the cell surface was damaged and sunk. Attenuated total reflectance fourier transform infrared (ATR-FTIR) spectroscopy revealed that the vibration peaks of C-C, C-H, C=O, P=O weakened within 12 h. According to the dynamic analysis of the infrared peaks, the damage on the cell groups under nano-TiO2 photocatalysis with different time periods was analyzed. The concentrations of K(+), Ca(2+), Mg(2+) released from the cells were measured, which indicated that nano-TiO2 photocatalysis have changed the cell membrane permeability and fluidity of M. aeruginosa.
authors.affiliation: Department of Chemistry, School of Sciences, Wuhan University of Technology, Wuhan, 430070, People's Republic of China.
authors.forename: Ruirui
authors.initials: R
authors.lastname: Lu
authors.forename: Peng
authors.initials: P
authors.lastname: Liu
authors.forename: Xiaojuan
authors.initials: X
authors.lastname: Chen
mesh_terms: D002118:Calcium / Q000378:metabolism; D002384:Catalysis; D008274:Magnesium / Q000378:metabolism; D046931:Microcystis / Q000187:drug effects*; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000633:toxicity*; D011188:Potassium / Q000378:metabolism; D017550:Spectroscopy, Fourier Transform Infrared; D014025:Titanium / Q000633:toxicity*; D014466:Ultraviolet Rays; D018508:Water Purification / Q000379:methods*
chemical_list: C009495:titanium dioxide; D014025:Titanium; D008274:Magnesium; D011188:Potassium; D002118:Calcium