Bo Wang,Masakazu Anpo,Jing Lin,Can Yang,Yongfan Zhang,Xinchen Wang
The preparation of ternary hexagonal boron carbon nitride (h-BCN) nanosheets was carried out by doping biomass glucose in situ into hexagonal boron nitride (h-BN). With this method, the construction of a two-dimensional (2D) semiconductor with tunable bandgap and characteristic adsorption ability toward organic molecules was achieved by maintaining the specific structure of h-BN and π-π interactions toward aromatic compounds. The ternary 2D h-BCN nanosheets worked effectively not only as a desirable adsorbent but also as an activator to benzene. Furthermore, the unique 2D h-BCN nanosheets were found to work as effective photocatalysts to convert benzene into phenol with less over-oxidation, leading to the development of a new type of Fenton oxidation reaction as the one-step visible light-driven hydroxylation of benzene. An optimal yield of 14.0% and its selectivity of 88.3% for the photocatalytic production of phenol from benzene were achieved by using h-BCN in the presence of FeCl 3 and H 2 O 2 in sustaining the same reactivity even after 4 cycles. This present study reports the latest development of phenol production from benzene by applying 2D h-BCN nanosheets as an artificial photosynthetic catalyst.
CO 2 photoreduction into highly value-added chemicals over metal-free h -BCN has emerged as a promising strategy to address the issue of global warming. However, the serious carrier recombination caused by disordered charger transfer has limited its practical application. To circumvent this issue, fluorine modified h -BCN were synthesized using a facile heat treatment method. The surface halogenation created local spatial polarized electric field, which facilitated the local charge separation and transmission efficiency. Among them, BCN-F-4 exhibited the best photocatalytic CO 2 reduction activitiy with CO and CH 4 yield of 25.38 and 14.11 µmol g −1 h −1 , respectively. The turnover number (TON) of BCN-F-4 reached up to 163.6 μmol g −1 h −1 , 4.4 times that of BCN. Both theoretical simulation and experimental analysis demonstrated a strong covalent interaction between the F atoms and the h -BCN matrix, which gain deep understanding of the mechanism of prominent photocatalytic CO 2 reduction activity boosted by surface halogenation.
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