Biogenic Hierarchical MIL‐125/TiO2@SiO2 Derived from Rice Husk and Enhanced Photocatalytic Properties for Dye Degradation. (26th February 2018)

• Record Type: Journal Article
• Authors: Zhaohui, Huang; Hui, Chen; Lei, Zhao; Xuan, He; Weixin, Li; Wei, Fang; Guanghui, Wang
• Is Part Of: Photochemistry and photobiology. Volume 94:Number 3(2018)
• Page Start: 512
• Page End: 520
• Publication Date: 2018-02-26
• Subjects: Photochemistry -- Periodicals; Light -- Physiological effect -- Periodicals; 541.35
• DOI: 10.1111/php.12873
• Languages: English
• ISSNs: 0031-8655

Abstract

Abstract: The hierarchical porous heterostructured MIL‐125/TiO2 @SiO2 composites are successfully obtained by biogenic‐templated method using rice husk both as biomorphic. The products are characterized by X‐ray diffraction, N2 ‐adsorption‐desorption analysis, scanning electron microscopy and Fourier transform infrared spectroscopy. The results reveal that MIL‐125/TiO2 @SiO2 possesses a hierarchical porous structure in scale from micrometer to nanometer with high Brunauer–Emmett–Teller (BET) surface area (385.7–902.7 m 2 g −1 ). The photocatalytic mechanism was discussed in detail. Meanwhile, the activity of MIL‐125/TiO2 @SiO2 for the photocatalytic degradation of rhodamine B in aqueous medium is significantly higher than that of P25. The current work provides some concept and methods in the development of MOF‐based photocatalysts. Abstract : Our approach for artificial catalyst synthesis is to construct hierarchically porous structures with combining semiconducting particles and MOFs to realize efficient light harvesting and photocatalytic degradation of dye. As spirited by photosynthetic system in nature, rice husk was used as bio‐templates to maintain their structural features with pores in macro‐/nanoscale, which were favorable for light harvesting and replicated on the morph‐TiO2 . The results show that MIL‐125/TiO2 @SiO2 composites performed sensitization effect and extending the material range of light absorb. The synergy effect of TiO2 and MOFs component can restrain photoinduced electronic–hole for composite to improve the photoelectric conversion efficiency.