High Photocatalyst Module on Degradation of Extracted Gas from Soil under Visible Light

Photocatalytic oxidation (PCO) is a promising technology for air purification due to low operating cost, potentially long service life, and low maintenance. In order to establish a high efficiency for removal of solid vapor extraction (SVE), in this study activated carbon was used for adsorption of SVE and lanthanum-doped titanium dioxide as a photocatalyst. The photocatalyst was coated on the glass fiber cloth and applied to the photocatalytic module and then performed for degradation of 15 ppm toluene. The adsorption module was used to eliminate the residual contaminants. The X-ray diffraction (XRD), Scanning electron microscopy (SEM) and the diffused reflectance spectroscopy (DRS), showed the synthesis of the catalyst were successfully prepared and the photocatalytic commercial module was designed by four photocatalytic glass fiber cloths under visible light. The adsorption module was designed by five layers of activated carbon each layer contained 30 g of activated carbon sets in the photocatalytic module. When the ambient humidity is less than 4 RH%, the removal efficiency was overtaken more than 95% within 1 hour. The experimental results depict that the photocatalytic commercial module is assembled with flow rate less than 3 liters per minute and the removal efficiency can be stable for more than 72 hours.