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- Title
A post-synthetic modified NH2-MIL-125 (Ti) catalyst for boosting photochemical Cr (VI) reduction.
- Authors
Zhang, Xin; Huang, Yuting; Bao, Mingjun; Gao, Yue; Zhou, Xiaoxue; Liu, Lexin; Hu, Ye; Zhang, Zhiguang
- Abstract
MOFs-based composites with visible light response have gradually attracted wide researchers' attention to water environmental remediation. Herein, a series of post-synthesis modified (PSM) NH 2 -MIL-125 (Ti) (R-BA-MIL-125 (Ti)) with phenyl-Schiff base-phenyl conjugate systems were successfully synthesized by a simple post-synthetic modification method. Under the optimization of catalyst structure designing, the photocatalytic reduction of Cr (VI) follows the order: –OH > -CH 3 > -H > -Cl > -NO 2 -BA-MIL-125 (Ti) > NH 2 -MIL-125 (Ti). Among them, 4-hydroxybenzaldehyde-modified NH 2 -MIL-125 (Ti) (OH-BA-MIL-125 (Ti)) exhibited the highest photocatalytic removal efficiency of hexavalent chromium (Cr (VI)) at visible light conditions and the removal rate for Cr (VI) reached 98.3% under 90 min with only 5 mg photocatalyst, which displayed 2.07 times that of NH 2 -MIL-125 (Ti). The introduction of para-substituted benzaldehydes not only extended the conjugated chain length, but also subtly reduced the band-gap energy (E g) of NH 2 -MIL-125 (Ti). Benefitting from broadening the range of photo-response and enhancing the ability of photoelectron generation, it could significantly enhance the ability of NH 2 -MIL-125 (Ti) to remove Cr (VI). ESR analyses indicate that e- and •O 2 - are the main active species. In addition, OH-BA-MIL-125 (Ti) exhibited good reusability and stability over 5 cycles. Therefore, this work will provide new insights into the fabrication of highly active catalysts by PSM for the remediation of chromium-containing wastewater. [Display omitted]
- Subjects
CATALYST structure; VISIBLE spectra; PHOTOREDUCTION; ENVIRONMENTAL remediation; CATALYSTS; HEXAVALENT chromium; PHOTOELECTRONS; CHROMIUM removal (Water purification)
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2023, Vol 172, p778
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2023.02.055