MgO-TiO₂-CaCO₃ photocatalyst

near-2× NO removal

A CO₂ mineralization-activated composite photocatalyst that boosts NO removal while suppressing toxic NO₂ formation.

Jiang, Xunli · Lu, Jianxin · Deng, Xingfa · Weiyi, Ji · Yanran, Cheng · Ding, Siqi · Luo, Xue · Zhang, Yuqing · Liu, Tiejun · Poon, Chi-Sun

Advanced Composites and Hybrid Materials 2026

Specifications

NO removal efficiency enhancement

{'zh': '≈2', 'en': '≈2'} ×

NO₂ generation reduction

{'zh': '50', 'en': '50'} %

Advantages

Nearly double NO removal

The MTC-10 composite introduces oxygen vacancies and enhances surface alkalinity via synergistic coupling of MgO and CaCO₃, accelerating carrier migration.

NO₂ byproduct halved

CaCO3 functions as a “transfer hub”, promoting charge redistribution, accelerating ROS generation, and facilitating nitrite-to-nitrate conversion, thereby suppressing toxic NO2/N2O4 intermediates.

Activation via CO₂ mineralization

The cement-based substrate's catalytic functionality enables in situ CaCO₃ generation through CO₂ mineralization, eliminating complex synthesis of additional cocatalysts.

Applications

• photocatalytic air purification：Mixed into cement pavements or facades to photodegrade airborne NOx under sunlight.
• NOₓ abatement：Deployed in high-traffic zones to abate NOx while suppressing secondary NO₂ formation.
• CO₂ mineralization utilization：Mineralizes captured CO₂ into CaCO₃, achieving both carbon sequestration and catalytic enhancement.