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Metal-organic frameworks derived Bi2O2CO3/porous carbon nitride: A nanosized Z-scheme systems with enhanced photocatalytic activity

2020; Elsevier BV; Volume: 267; Linguagem: Inglês

10.1016/j.apcatb.2020.118700

1873-3883

Ziwei Wang, Han Wang, Zhuotong Zeng, Guangming Zeng, Piao Xu, Rong Xiao, Danlian Huang, Xijian Chen, Linwei He, Chengyun Zhou, Yang Yang, Zixuan Wang, Wenjun Wang, Weiping Xiong,

Covalent Organic Framework Applications

A bismuth-based metal-organic frameworks (MOFs) derived strategy is developed to construct nanoscale Bi2O2CO3/porous g-C3N4 Z-scheme heterojunction. Bi2O2CO3 nanoparticles uniformly distribute in the surface, edge and interlayer of g-C3N4 nanosheets, thus significantly increasing intimate contact at the interface. Furthermore, the Z-scheme heterojunctions and doped N atoms escaping from g-C3N4 to Bi2O2CO3 provide a charge transport chain to promote the charge carriers separation and accelerate the oxidation of O2− by holes, as confirmed by photoluminescence, photoelectrochemical and electron spin resonance measurements. Benefitting from these, the optimized composites not only outperform the pristine g-C3N4 in the removal of sulfamethazine (SMT) within 90 min visible light illumination (λ > 420 nm) but also serve to selectively generate singlet oxygen (1O2) during the molecular oxygen activation. The present study provides some guidelines for the design of photocatalysts via a MOF-assisted route toward sustainable environmental remediation.