Abstract
In this paper, a novel TiO2-SiO2 aerogel nanocomposite absorbent was successfully synthesized using the sol-gel and ambient pressure drying method, and its photocatalytic degradation effects on automobile exhaust were investigated for the first time. The microstructures and properties of the Nano TiO2-SiO2 aerogels were characterized using various methods, including x-ray Diffraction (XRD), Brunauer–Emmett–Teller (BET) specific surface area analysis, Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS) and Fourier Transform Infrared Spectroscopy (FT-IR). The exhaust purification tests were conducted in a self-developed instrument to investigate the degradation effects of Nano TiO2-SiO2 aerogels on automobile exhaust through degradation rate. Experimental results showed that the Nano TiO2-SiO2 aerogels had a good photocatalytic degradation effect on automobile exhaust, and the degradation rates of CO, CO2, HC and NOx were 1.3%, 1.5%, 3.2% and 34.4%, respectively. The well-designed microstructure makes the Nano TiO2-SiO2 aerogels a stable photocatalytic material with high specific surface area and big average pore size, which has promising applications in environmental treatment.
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