Biogenic Hierarchical MIL‐125/TiO₂@SiO₂ Derived from Rice Husk and Enhanced Photocatalytic Properties for Dye Degradation

Abstract

The hierarchical porous heterostructured MIL-125/TiO @SiO composites are successfully obtained by biogenic-templated method using rice husk both as biomorphic. The products are characterized by X-ray diffraction, N -adsorption-desorption analysis, scanning electron microscopy and Fourier transform infrared spectroscopy. The results reveal that MIL-125/TiO @SiO possesses a hierarchical porous structure in scale from micrometer to nanometer with high Brunauer-Emmett-Teller (BET) surface area (385.7-902.7 m g ). The photocatalytic mechanism was discussed in detail. Meanwhile, the activity of MIL-125/TiO @SiO 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.

Triethylamine as a tuning agent of the MIL-125 particle morphology and its effect on the photocatalytic activity

“…Research Article SN Applied Sciences (2020) 2:1881 | https://doi.org/10.1007/s42452-020-03683-1 morphologies here reported, like MIL-125_TEA1 [16,18,20] or MIL-125_TEA3 [14,17] (as mentioned in the Sect. 1, without using the Ti-oxocluster as a precursor).…”

“…However, this precursor is barely employed in later reports. Titanium isopropoxide [14][15][16][17][18][19][20][21][22][23] and titanium t-butoxide [24][25][26][27][28][29][30][31] are currently the preferred precursors in the synthesis of MIL-125 materials or derivatives. In the experience of this group, MIL-125 could be obtained from the Ti-oxocluster only by using PARR reactors, with some syntheses failing to lead the desired material.…”

“…MIL-125 has been employed in a range of photocatalytic applications, mainly in advanced heterostructured materials [16,35,36]. Despite its high bandgap, dyes from waste water can be decomposed under visible light with this kind of materials, thanks to the reactions induced from the injection of photogenerated electrons in the dye to the semiconductor, as shown in many works employing TiO 2 [37].…”

Rapid and selective adsorption of a typical aromatic organophosphorus flame retardant on MIL-101-based metal–organic frameworks

“…Compared with other types of MOFs, the materials of MIL series possess higher stability in water environment and nanopores at the range of about 1-4 nm (ref. 19) which may be conducive to the sorption of TPhP molecules whose maximum molecular diameter is about 1.14 nm (calculated by Gaussian 09 soware). Besides, the benzene structures in such MOFs can form p-p interactions with aromatic substances.…”

Compositing Two-Dimensional Materials with TiO2 for Photocatalysis

“…With the massive consumption of fossil energy and serious environmental pollution problems, there is an urgent need for clean energy and more efficient ways to decompose pollutants. Photocatalysis is an advanced technology that uses photon energy to convert chemical reactions occurring under harsh conditions into reactions under mild conditions by appropriate photocatalyst, and thus emerged as recognizable fields such as hydrogen generation [1][2][3][4], sewage treatment [5][6][7], harmful gas removal [8,9], organic pollutant degradation [10][11][12][13] and carbon dioxide reduction [14][15][16].…”