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• A novel Ti 1−x Fe x O 2 nanoarchitectures (NAs-Ti 1−x Fe x O 2) was facilely prepared by a hydrothermal process. • NAs-Ti 1−x Fe x O 2 exhibit excellent photocatalytic performance due to the active atoms exposed on (101) and (001) surfaces. • Fe3+ could convert Fe2+ and Fe4+ by capturing carrier (e- and h+) on the (101) and (001) surfaces. • NAs-Ti 1−x Fe x O 2 have promising applications in environmental remediation due to its efficient performance. • Photocatalytic mechanism of degradation of antibiotics was proposed. [Display omitted] Facing the increasing antibiotics pollution, it is essential to develop novel and highly efficient photocatalysts in purification systems. Herein, Fe3+-incorporated tetragonal bipyramid anatase TiO 2 nanoarchitectures (NAs-Ti 1−x Fe x O 2) with exposure of highly active atoms (Fe, O and Ti) on the (101) and (001) surfaces were prepared via a hydrothermal process. Experimental studies show that these fabricated NAs-Ti 1−x Fe x O 2 exhibit excellent photocatalytic performance for degradation of pollutant antibiotics. Based on the stabilization mechanism, a detailed analysis of many active atoms were stabilized on the (101) and (001) surfaces of NAs-Ti 1−x Fe x O 2 due to Ti–O/Ti–F/Fe–F bond attractions. A series of characterization experiments show that Fe3+ is regarded as a significant component and participated in the reaction process for antibiotics degradation. Besides, high exposure of active atoms due to this Fe3+ incorporated tetragonal bipyramid anatase TiO 2 (one dimensional sizes verge on 1–3 nm) further improves the separation efficiency of photogenerated carriers and free radical yield than traditional nanomaterials. What's more, the photoinduced electrons are also easier to transfer to the (101) crystal plane and the holes remained on the (001) crystal plane. In conclusion, excellent performance can be amplified, which is derived from smaller nanometric size. This study provides an insight into the enhanced photocatalytic degradation of pollutant antibiotics employing the Fe3+-incorporated tetragonal bipyramid anatase TiO 2. [ABSTRACT FROM AUTHOR]

The effects of rare-earth (RE) micro-alloying on the microstructures, mechanical properties, and internal friction (IF) of 51CrV4 steels after quenching and tempering were investigated. The addition of RE elements was beneficial for refining the size of the martensite and increasing the fraction of twins in the 51CrV4 steels. The RE-51CrV4 steel possessed a high dislocation density and a large fraction of low-angle grain boundaries after quenching. Cr7C3 carbides of RE-51CrV4 steel tended to precipitate along the lath martensite interfaces and were easily spheroidized during tempering. With the addition of RE elements, the Snoek–Köster–Kê (SKK) peak was increased after quenching but decreased after different tempering times. The results of the IF and high-resolution transmission electron microscopy analyses indicated that RE atoms formed micro-segregations at the lath martensite interfaces and resulted in a pinning effect on the carbon atoms. Therefore, the hardenability of the RE-51CrV4 steel was reduced, whereas its elongation improved significantly due to the presence of high-density twins and spheroidized carbides. • Rare earth (RE) atoms formed micro–segregations at lath martensite interfaces. • RE atoms have a pinning effect on carbon atoms in heat treatment process. • The morphology of the carbides becomes spherification in RE-51CrV4 steel. • The addition of RE elements is helpful to refine the size of martensite. [ABSTRACT FROM AUTHOR]