| Summary: | Novel bamboo activated carbon (BAC) catalysts decorated with manganese oxides (MnO<sub>x</sub>) were prepared with varying MnO<sub>x</sub> contents through a facile one-step redox reaction. Due to the physical anchoring effect of the natural macropore structure for catalyst active components, homogeneous MnO<sub>x</sub> nanoparticles (NPs), and high specific surface area over catalyst surface, the BAC@MnO<sub>x</sub>-N (N = 1, 2, 3, 4, 5) catalyst shows encouraging adsorption and catalytic oxidation for indoor formaldehyde (HCHO) removal at room temperature. Dynamic adsorption and catalytic activity experiments were conducted. The higher S<sub>micro</sub> (733 m<sup>2</sup>/g) and V<sub>micro</sub>/V<sub>t</sub> (82.6%) of the BAC@MnO<sub>x</sub>-4 catalyst could facilitate its excellent saturated and breakthrough adsorption capacity (5.24 ± 0.42 mg/g, 2.43 ± 0.22 mg/g). The best performer against 2 ppm HCHO is BAC@MnO<sub>x</sub>-4 catalyst, exhibiting a maximum HCHO removal efficiency of 97% for 17 h without any deactivation as RH = 0, which is higher than those of other MnO<sub>x</sub>-based catalysts. The average oxidation state and in situ DRIFTS analysis reveal that abundant oxygen vacancies on the BAC@MnO<sub>x</sub>-4 catalyst could be identified as surface-active sites of decomposing HCHO into the intermediate species (dioxymethylene and formate). This study provides a potential approach to deposit MnO<sub>x</sub> nanoparticles onto the BAC surface, and this hybrid BAC@MnO<sub>x</sub> material is promising for indoor HCHO removal at room temperature.
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