In the experiment, TiO 2 nanoparticles were suspended in deionized water and stirred, and then ultrasonic treated in ultrasonic instrument (? Model elmasonic vc300) at room temperature for 30 minutes. Six kinds of TiO 2 solutions of 0, 100, 200, 300, 400 and 500 mg / L were prepared with deionized water.<br>
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