Preparation of TiO_2-Pillared Montmorillonite as application to the control of blue green algae growth in eutrophic water

摘要

TiO_2-pillared montmorillonite is successfully synthesized via sol-gel method, which is used to remove blue-green algae from water. The composite was characterized by X-ray diffraction and Scanning electron microscope. The analysis results shows that TiO_2 has entered into the interlayer of montmorillonite and the d001 increases from 1.27639 nm to 1.64437 nm, and the surface charge of montmorillonite was recyanobacteriarkably raised from -41.5 mV (Fig. 1a) to＋12.21 mV (Fig. 1b) mV at pH=6～8. The results of algae adsorption experiments displays the positive surface charge of modified montmorillonite was thus expected to induce the electrostatic neutralization between TiO_2-pillared montmorillonite and Microcystis aeruginosa (CYANOBACTERIA) cells. When the cyanobacteria concentration is 12100 number/μL, chlorophyll content is 2.831883 mg/L, turbidity of the water is 44.2%, and TiO_2-pillared montmorillonite is 0.5 g/L, the removing rate of chlorophyll and microcystis exceeds 90%, and the turbidity reduces from 44.2% to 19.1%.