对铜陵叶山铁矿开采所产生的低品位褐铁矿尾矿(LT)进行探究，旨在发掘其在室温净化甲醛领域中的应用价值及其载体性能。通过分析该尾矿的成分，发现其含有纳米针铁矿、石英等矿物，具有较大的比表面积，适合作为催化剂载体。采用化学还原法将δ-MnO2(Bir)负载于尾矿颗粒表面，制备了一系列不同锰含量的除醛催化剂(x-Bir/LT)。结果表明：该催化剂具有良好的催化降解甲醛的能力。在甲醛初始浓度为1.2 mg/m3，体积空速为260 000 h-1的条件下，27.3-Bir/LT在600 min时净醛效果仍有97.2%，并且具有长时间稳定性和抗水性。通过原位红外光谱分析发现，甲醛在催化剂表面反应的机制为：甲醛被表面羟基吸附后氧化成H+和HCOO-，并经过羟基和表面活性氧氧化，进一步分解成CO2和H2O。同时，氨气吸附原位红外分析发现，该尾矿能为催化剂提供大量的L-酸位点，提高了复合催化剂的催化氧化能力。因此以褐铁矿尾矿为催化剂的载体可以提升复合催化剂的净醛能力，为其用于室内甲醛等污染治理提供了理论支撑。

The application and performance of low-grade limonite tailings (LT) from Yeshan Iron Mine (Tongling, China) were investigated for the formaldehyde purification at ambient temperature. According to the composition analysis of the tailings, the presence of minerals like nanoneedle hematite and quartz with a great specific surface area is suitable as a catalyst carrier. In this paper, birnessite (Bir) was loaded onto the surface of LT particles via chemical reduction to prepare a catalyst for formaldehyde removal with different manganese loads (x-Bir/LT). The results show that the catalyst has a good formaldehyde degradation ability. The removal efficiency of 27.3-Bir/LT is still 97.2% after 600 min at an initial formaldehyde concentration of 1.2 mg/m3 and a gas hourly space velocity of 41.6 m/s, thus having a long-term stability and a water resistance. According to the analysis by in-situ infrared spectroscopy, formaldehyde reacts on the catalyst surface via being adsorbed by surface hydroxyl groups and then oxidized to H+ and HCOO-, which further decomposes into CO2 and H2O through hydroxyl and surface reactive oxygen species oxidation. Also, LT provides a large number of L-acid sites for the catalyst, improving the catalytic oxidation performance of the composite catalyst. Using limonite tailings as a catalyst carrier can enhance the catalytic oxidation performance of the composite catalyst. This work provides a technical reference for its application in indoor formaldehyde pollution control.