Indoor air quality is closely related to human health. As one of the main pollutants in the indoor environment, formaldehyde, is a colorless and irritating gas, which is easy to volatilize at room temperature. Exposure to formaldehyde even as low as 0.3-0.5 ppm over short-term periods of time can cause eyes and nasal passages to be irritated due to formaldehyde. Exposure to formaldehyde at larger than 1 ppm concentration for extended time causes serious health issues, such as lung function decline, liver injury, and other pathologies. Removing formaldehyde from indoor air is particularly vital to maintain human health since more than 80% time of people's life are spent in indoors. Catalytic oxidation is a promising technology to remove formaldehyde in indoor environments. Formaldehyde can be converted into carbon dioxide and water with the assistance of catalyst. This method has significant advantages of requiring simple equipment, exhibiting no secondary pollution and having high efficiency. Traditional catalysts mainly include precious metal and metal oxides. Platinum (Pt), aurum (Au), and argentum (Ag) are currently used for catalytic oxidation of formaldehyde. Although precious metals can achieve 100% removal efficiency (RE) above 100°C, catalytic activities at room temperature are less effective, such as only 12% RE for gold/iron-oxide catalyst and less than 10% RE for Ag/TiO2. In addition, the high price of precious metals also limits their industrial application. For metal oxides, MnO2/cellulose composites can completely degrade 100 ppm HCHO at 140°C, but only achieve 15% RE at 60°C. CoMn-oxide catalysts can catalyze the oxidation of 80 ppm formaldehyde into CO2 and H2O at 60 C, while only 23% of formaldehyde can be converted at 30°C. Therefore, it is crucial to develop novel catalysts with high catalytic activity at room temperature.