Yixiong Wu,Yanqi Xu,Cunjun Li,Hai Wang,Xinyu Wang,Aimiao Qin,Haiqing Qin,Linjiang Wang
One-step selectively photocatalytic phenol hydroxylation to produce Dihydroxybenzenes (DHB) is an attractive and challenging strategy. However, the rapid recombination of photogenerated carriers existed in single component photocatalyst seriously hinders the photocatalytic efficiency. The heterojunction strategy can optimize the band structure of the photocatalyst, and effectively improve the carriers' separation and transfer during the photocatalytic process. Herein, we successfully designed and prepared a 3D TiO 2 @Ni 3 Fe 1 -LDH core-shell heterostructure photocatalyst by coupling TiO 2 nanorods with Ni 3 Fe 1 -LDH nanosheets for the photocatalytic phenol hydroxylation to produce DHB. The results showed that the 3D TiO 2 @Ni 3 Fe 1 -LDH core-shell heterostructure had a suitable energy band structure for the photocatalytic phenol hydroxylation and the heterostructure accelerated the carriers’ separation and transfer. Meanwhile, the high porosity and abundant active sites were conducive to the adsorption of H 2 O 2 and the photogenerated carriers transfer efficiency from the photocatalyst to H 2 O 2 . The 3D TiO 2 @Ni 3 Fe 1 -LDH core-shell heterostructure showed excellent photocatalytic performance of phenol hydroxylation, where the phenol conversion was 48.6%, and the selectivity of DHB was 81.1% at 25 °C and 4 h of light illumination. Furthermore, the as-prepared photocatalysts exhibited good stability after four cycles of experiment. This work provided a convenient and efficient method for the green synthesis of DHB.
Yanqi Xu,Yixiong Wu,Hai Wang,Shuzhen Ma,Luyang Gan,Cunjun Li,Linjiang Wang
The efficiency of photocatalytic activity for hydroxylation of phenol is often hindered by rapid recombination of photogenerated charge carriers, posing a challenge for practical applications. Developing heterostructure photocatalysts that facilitate effective charge separation while ensuring ease of recovery is crucial. In this study, we report a TiO 2 @NiFe-LDH/Fe 3 O 4 heterostructure photocatalyst with a 3D core-shell architecture, fabricated via co-precipitation of Fe 3 O 4 nanoparticles onto NiFe-layered double hydroxide nanosheets (NiFe-LDH) supported on TiO 2 nanorods (TiO 2 NRs). This magnetic heterostructure demonstrated prefect photocatalytic performance for hydroxylation of phenol to dihydroxybenzenes (DHB), where the phenol conversion and DHB selectivity achieved 51.2% and 91.2%, outperforming individual TiO 2 NRs, Fe 3 O 4 , NiFe-LDH, and TiO 2 @NiFe-LDH. The outstanding activity can be attributed to efficient charge separation and rapid redox capabilities. Moreover, recycling experiments confirmed the photocatalyst's robust stability and ease of recovery. This work underscores the potential of heterostructure strategies in developing high-performance, recyclable photocatalysts for industrial applications. Graphical A 3D core-shell TiO 2 @NiFe-LDH/Fe 3 O 4 heterostructure enhances charge separation via directional electron/hole transfer, achieving 51.2% phenol conversion and 91.2% DHB selectivity. Magnetic Fe 3 O 4 enables facile recovery over 5 cycles, demonstrating scalable photocatalytic design.
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