Synthesis of phosphorus-doped defective titania hydrogel and its degradation performance for formaldehyde
[Introduction]Highly efficient and low-cost treatment of formaldehyde released from decorative coatings is the key and difficulty to improve indoor air quality.[Method]TiO2 doped with different amounts of phosphorus were prepared from defective TiO2 hydrosol and hypophosphorous acid by wet chemical oxidation-reduction method.The composition,structure,and photoelectrochemical properties of the photocatalysts were characterized by X-ray diffraction(XRD),nitrogen adsorption-desorption measurement,Raman spectroscopy,transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),ultraviolet-visible diffuse reflectance spectroscopy,and electrochemical measurement.The mechanism for photocatalytic degradation of formaldehyde by P-doped TiO2 was proposed based on the bandgap data and Mott-Schottky curves.[Result]The P-doped TiO2 prepared at a molar ratio of Ti element to hypophosphorous acid of 1:1 showed the best performance in catalyzing the degradation of formaldehyde under ultraviolet light.The formaldehyde degradation rate of the P-doped TiO2 within 2 hours was 90.8%,which was 45 times that in the absence of photocatalyst and 4.5 times that of the undoped TiO2.Due to the introduction of phosphorus element,the light response capability of TiO2 is enhanced,the specific surface area is increased,the separation and transfer of photogenerated carriers are accelerated,and hence the photocatalytic performance is significantly improved.[Conclusion]P-doped TiO2 has advantages of low cost,high efficiency,easy production,and environmental friendliness,and has great potential for application in air purification.
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