TY  - JOUR
AU  - Liang, Jialin
AU  - Yuan, Fang
AU  - Sun, Qing
AU  - Wang, Jiajia
AU  - Qian, Chenguang
AU  - Liang, Shurui
AU  - Zhang, Xin
AU  - Li, Chunquan
AU  - Sun, Zhiming
PY  - 2026
TI  - Diatomite interface-mediated MnO2 growth for enhanced hydroxyl activity and mass transfer in efficient room-temperature formaldehyde degradation
JO  - Journal of Materiomics
SN  - 2352-8478
VL  - 12
IS  - 3
AB  - Traditional indoor formaldehyde (HCHO) treatment technologies often rely on light or thermal fields to supply catalytic energy, limiting their practical application in indoor environments. This study presents an in-situ growth strategy for uniformly loading δ-MnO2 onto diatomite to achieve efficient room-temperature catalytic oxidation of HCHO. The size of δ-MnO2 on the δ-MnO2/diatomite (50% MD) composite is significantly reduced, forming a microporous structure, with δ-MnO2 nanoflowers uniformly dispersed on the diatomite surface. The optimal 50% MD composite exhibits a hierarchical pore structure, greatly enhancing catalytic site exposure, and achieving a HCHO removal rate of 98.0%. The enhanced performance is attributed to the interaction between diatomite and δ-MnO2, which optimizes the particle size and dispersion of δ-MnO2, increases the Mn3+ content, and improves the surface oxygen activity of δ-MnO2. In-situ DRIFTS analysis demonstrates that 50% MD possesses the highest adsorption capacity of H2O, which is conducive to accelerating the conversion of intermediates and promoting the desorption of CO2. Moreover, SEM-FIB analysis intuitively reveals efficient H2O mass transfer on 50% MD to aid hydroxyl groups (–OH) regeneration. This work establishes a cost-effective, energy-free, and scalable strategy for indoor HCHO purification via coupled mineral-enabled transport engineering and interface-driven MnO2 activation.
UR  - https://doi.org/10.1016/j.jmat.2026.101200
DO  - 10.1016/j.jmat.2026.101200