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/g_cat 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.

室内甲醛（HCHO）污染受到广泛关注，在室内环境所需的室温下，以高气时空速（GHSV）去除低水平的HCHO仍然是一个挑战。因此，通过快速的一步步骤，即钾锰和葡萄糖在80°C下进行15分钟的氧化还原反应，合成了石墨状的纳米碳装饰的MnO ₂（GLC-MnO ₂）。合成后的GLC-MnO ₂杂化物在室温下显示出优异的HCHO去除活性和矿化成CO _2的活性。在600 L / g _cat  h的GHSV下，0.5 mg / m ³ HCHO的单程去除效率高达〜92％，而1.0 mg / m ³的单程去除效率高达〜89％。HCHO，远高于以前通过MnO ₂基催化剂获得的HCHO 。此外，其室温活动几乎不受4％–80％范围内的相对湿度的影响。GLC-MnO ₂的显着增强的催化性能可以归因于大量的Mn空位和表面吸附的活性氧，这是由于在制备GLC-MnO _2的过程中原位形成的纳米碳共存而产生的。纳米碳的存在还可以促进电子转移以形成用于HCHO氧化的反应性氧化物质。本研究提供了开发有效去除室内空气污染物的催化剂的新途径。