MnO₂ nanoflowers were supported on porous hydrothermal carbon via in situ loading and used for the catalytic oxidation of formaldehyde from plywood manufactured with UF adhesive. The prepared MnO₂ had a δ-type structure. The use of hydrothermal carbon (Hcs) improved the dispersion of active components in the materials and provided space for the catalytic reactions. Hcs/MnO₂ exhibited catalytic activity and stability during formaldehyde oxidation at room temperature. The formaldehyde removal efficiency reached 90.43 % in 30 min. The Hcs/MnO₂ had more oxygen vacancies than the MnO₂ catalyst, providing more abundant active substances such as -OH, O₂^-, O^- and other active substances to promote the catalytic reaction. The effects of Hcs/MnO₂ on the formaldehyde emission and the mechanical properties of plywood were investigated. The MOR, MOE and bonding strength of the Hcs/MnO₂-loaded plywood with 9 % Hcs were 51.1 MPa, 2994 MPa, and 0.8 MPa, respectively. After 28 d of exposure, the formaldehyde emitted from the plywood treated with Hcs/MnO₂ decreased to 0.023 mg/m³, which fulfilled the requirement for E_NF grading. The controlled release of free formaldehyde from plywood by Hcs/MnO₂ was reflected by changes in mass transfer and catalytic oxidation. The manganese oxides in the micropores of the wood reduced the diffusion coefficient of free formaldehyde and hindered migration through the substrate. Once the concentration of formaldehyde decreased to a certain level, it was degraded by Hcs/MnO₂, thus removing formaldehyde from the source.

中文翻译：

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在常温下，使用多孔水热碳负载的 MnO2 纳米花增强胶合板甲醛氧化


MnO₂ 纳米花通过原位负载负载在多孔热液碳上，并用于催化氧化用 UF 粘合剂制造的胶合板中的甲醛。制备的 MnO₂ 具有 δ 型结构。水热碳 （Hcs） 的使用改善了活性成分在材料中的分散性，并为催化反应提供了空间。Hcs/MnO₂ 在室温下甲醛氧化过程中表现出催化活性和稳定性。30 min甲醛去除率达到90.43 %。Hcs/MnO₂ 比 MnO₂ 催化剂具有更多的氧空位，提供了更丰富的活性物质如 -OH、O₂^-、O^- 等活性物质来促进催化反应。研究了 Hcs/MnO₂ 对胶合板甲醛释放和力学性能的影响。Hcs含量为9 % 的Hcs/MnO₂负载胶合板的MOR、MOE和粘结强度分别为51.1 MPa、2994 MPa和0.8 MPa。暴露 28 d 后，Hcs/MnO₂ 处理胶合板释放的甲醛降至 0.023 mg/m³，满足 E_NF 分级要求。Hcs/MnO₂ 对胶合板游离甲醛的受控释放反映在传质和催化氧化的变化上。木材微孔中的锰氧化物降低了游离甲醛的扩散系数，阻碍了通过基材的迁移。一旦甲醛浓度降低到一定水平，它就会被 Hcs/MnO₂ 降解，从而从源头上去除甲醛。