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TiO 2 /g-C 3 N 4 nanofibers with diameter of 100–200 nm were prepared by electrospinning method after calcination at high temperature, using polyvinylpyrrolidone (PVP), Melamine (C 3 H 6 N 6 ), Ti(OC 4 H 9 ) 4 as raw materials. The composite nanofibers were characterized by XRD, FT-IR, SEM, UV–vis and PL respectively. The effects of different g-C 3 N 4 contents on structure and photocatalytic degradation of the composite nanofibers were investigated. The results indicated that with increasing g-C 3 N 4 content, the diameter of the composite fibers increased and the morphology changed from uniform structure to a nonuniform one, containing beads. The composite nanofibers displayed the best photocatalytic degradation on RhB, when the g-C 3 N 4 content was 0.8 wt%. The degree of degradation was up to 99% at the optimal conditions of 40 min. The degradation activity of the composite nanofibers on RhB, MB and MO was found to be higher than that of the TiO 2 nanofibers. [ABSTRACT FROM AUTHOR]

In article number 1802607, Ning Wang, Xiaolin Wang, Hui Wu and co‐workers present a new strategy based on pre‐amidoximation and blow spinning technique for industry scale production of fully amidoximated poly(imide dioxime) nanofiber adsorbent with significantly enhanced capacity and practicability for uranium extraction from natural seawater. The outstanding performance is attributed to the full coverage of chelating sites, excellent hydrophilicity, 3D porous architecture and good mechanical properties. [ABSTRACT FROM AUTHOR]

The oceans contain hundreds of times more uranium than terrestrial ores. Fiber‐based adsorption is considered to be the most promising method to realize the industrialization of uranium extraction from seawater. In this work, a pre‐amidoximation with a blow spinning strategy is developed for mass production of poly(imide dioxime) nanofiber (PIDO NF) adsorbents with many chelating sites, excellent hydrophilicity, 3D porous architecture, and good mechanical properties. The structural evidences from 13C NMR spectra confirm that the main functional group responsible for the uranyl binding is not "amidoxime" but cyclic "imidedioxime." The uranium adsorption capacity of the PIDO NF adsorbent reaches 951 mg‐U per g‐Ads in uranium (8 ppm) spiked natural seawater. An average adsorption capacity of 8.7 mg‐U per g‐Ads is obtained after 56 d of exposure in natural seawater via a flow‐through column system. Moreover, up to 98.5% of the adsorbed uranium can be rapidly eluted out and the adsorbent can be regenerated and reused for over eight cycles of adsorption–desorption. This new blow spun PIDO nanofabric shows great potential as a new generation adsorbent for uranium extraction from seawater. Over hundreds of times more uranium exists in the oceans than exists in terrestrial ores. A novel strategy based on preamidoximation with blow spinning is developed for industrial scale production of fully amidoximated nanofiber adsorbents with significantly enhanced capacity and practicability for application in uranium extraction from natural seawater. [ABSTRACT FROM AUTHOR]