One-step synthesis of nanocarbon-decorated MnO 2 with superior activity for indoor formaldehyde removal at room temperature

By Fang Liu, Shaopeng Rong, Pengyi Zhang, Gao Lele. Applied Catalysis B: Environmental, 2018

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Abstract Indoor formaldehyde (HCHO) pollution receives wide concerns, it is still a challenge to remove low-level HCHO at high gas-hourly space velocity (GHSV) at room temperature required in the indoor environment. Thus, a graphite-like nanocarbon decorated MnO2 (GLC-MnO2) was synthesized with a rapid one-step procedure, i.e., a redox reaction between potassium manganese and glucose at 80 °C for 15 min. The as-synthesized GLC-MnO2 hybrid showed excellent activity for HCHO removal and its mineralization to CO2 at room temperature. Under the GHSV of 600 L/gcat h, the single-pass removal efficiency was as high as ∼92% for 0.5 mg/m3 HCHO and ∼89% for 1.0 mg/m3 HCHO, which is much higher than those previously achieved by MnO2-based catalysts. Furthermore, its room-temperature activity was little influenced by the relative humidity in the wide range of 4%–80%. The significantly enhanced catalytic performance of GLC-MnO2 could be attributed to abundant Mn vacancies and surface adsorbed active oxygen resulted from the coexisted nanocarbon which in-situ formed during preparation of GLC-MnO2. The presence of nanocarbon may also facilitate electron transfer to form reactive oxidation species for HCHO oxidation. The present study provides a new route to develop efficient catalyst for indoor air pollutants removal.

Subfields: Electrical and Electronic Engineering, Health, Toxicology and Mutagenesis, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/ecfafd39e3d7fb45ee51b67648893a864bde513e