Experimental study on bacteria-killing ability of TiO2 composite powders in HVAC system

Prepares the anatase nano- TiO₂ composite powders mixed with cerous nitrate and tourmaline powders by a physical method. Characterizes the composite powders by X-ray diffraction(XRD) and scanning electron microscopy(SEM), and conducts the experiment of killing Aspergillus niger and Staphylococcus aureus. The results show that the bacteria-killing capacity of the composite powders is much better than pure TiO₂ and tourmaline powders; the bacteria-killing capacity enhances with the increase of the dosage and the contact time with the bacteria, and the killing rate can approach 100 percent.