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Morphology-tunable WMoO nanowires catalysts for the extremely efficient elimination of tetracycline: kinetics, mechanisms and intermediates

Abstract

The presence of antibiotics in aquatic environment has attracted global concern. Fenton system is one of most popular methods to eliminate the antibiotics in aquatic environment. However, the existed Fenton system is limited due to the potential second pollution and narrow pH range (~3-5). In this study, we report that the bottlenecks for high strength tetracycline (TC) wastewater treatment at neutral condition can be well tackled by one class of mixed-valence W/Mo containing oxides (WMoO-x) with tunable morphologies. Triethanolamine was selected as a structure-directing agent to control the catalysts morphologies from ultrathin nanowires (UTNWs) to wires-tangled nanoballs (WTNBs). As a proof of concept, the most efficient catalyst in the batch samples, WMoO-1 ultrathin nanowires are employed as a model material for TC degradation, in which the coordinatively unsaturated metal atoms with oxygen defects serve as the sites for TC chemisorptions and electron transfer. As a result, 91.75% of TC was degraded in 60 min for the initial TC concentration of 400 μM. Furthermore, LC-MS analysis confirmed that the TC could be degraded to the nontoxic by-products without benzene ring, and finally mineralized to CO2 and H2O. ICP-MS and cycle experiments showed the good stability and reusability of WMoO-1 UTNWs during the Fenton-like system. The findings of this work provide fresh insights into design of nanoscale catalyst morphology and reaffirm the versatility of doping in tuning catalyst activity. It widens the range of the optimal pH values up to neutral conditions, and is significant for the expansion of the heterogeneous Fenton-like family and its application in the field of water treatment.

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Supplementary files

Publication details

The article was received on 09 Oct 2018, accepted on 05 Dec 2018 and first published on 07 Dec 2018


Article type: Paper
DOI: 10.1039/C8NR08162J
Citation: Nanoscale, 2018, Accepted Manuscript
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    Morphology-tunable WMoO nanowires catalysts for the extremely efficient elimination of tetracycline: kinetics, mechanisms and intermediates

    Y. Hu, K. Chen, Y. Li, J. He, K. Zhang, T. Liu, W. Xu, X. Huang, L. Kong and J. Liu, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR08162J

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