Recently, hollow nanofibers could be fabricated by coaxis electrospinning method or template method. However, they are limited to applications because of the hardship in actual preparation. In this work, hollow γ-AlO nanofibers with loofah-like skins were first fabricated by using a single spinneret during electrospinning. These intriguing nanofibers were explored as new Pt supports with excellently sinter-resistant performance up to 500 °C, attributed to the unique loofah-like surface of γ-AlO nanofibers and the strong metal-support interactions between Pt and γ-AlO. When applied in the catalytic reduction of p-nitrophenol, the Pt/γ-AlO calcined at 500 °C exhibited 4-times higher reaction rate constant (6.8 s·mg) over free Pt nanocrystals.
The molluscicide
niclosamide is found in most of the wetlands of
China. The migration and transformation pathways, and degradation
kinetics of niclosamide in the plant–soil system was analyzed
by with the use of potting experiment. Experimental results showed
that degradation of niclosamide in rhizosphere soil fit the first-order
kinetics, and microorganisms played an important role in the degradation
of niclosamide. It was found that niclosamide degrades to form a series
of aromatic intermediate products both in soil and plants. Niclosamide
could be absorbed from soil to plant by the root and then migrate
to the stem. At an initial concentration of niclosamide of 2.11 mg·kg–1 in soil, the maximum residue of niclosamide in Artemisia somai aerial was 2.47 mg·kg–1 after 10 days of cultivation. This value is close to the pollution
maximum residue limit (3 mg·kg–1) in rice,
and niclosamide and its intermediates can remain about 43 days in
plants. The experimental results demonstrate that the use of niclosamide
in wetlands would have some risk in edible plants and was harmful
for human health.
A new conductive composite composed of nanoscale carbon black (CB) and poly(3,4-ethylenedioxythiophene) (PEDOT) was prepared by a simple in-situ polymerization. The morphology of the composite was characterized by scanning electron microscopy and transmission electron microscopy. The structure and thermal stability were examined by Fourier transform infrared spectroscopy and thermal gravimetric analysis, respectively. The results indicated that the addition of CB improved the agglomerated state of PEDOT. On the one hand, CB effectively hindered the agglomeration of PEDOT during the polymerization. Thus, the obtained CB-PEDOT composite dispersed well in solution, which can facilitate the reprocessing of CB-PEDOT. On the other hand, CB covered most of the surface of PEDOT, which enhanced the electrical conductivity of CB-PEDOT. Furthermore, the interfacial interaction between CB and PEDOT improved the thermal stability of CB-PEDOT. The findings of this research suggest that CB can replace polyelectrolyte poly(styrenesulfonic acid) (PSS) to achieve reprocessable materials for certain applications.
Graphene sheets, a flexible 2D material with excellent absorptive capacity, have great potential as absorbing materials. However, this material has always suffered from irreversible aggregation and thus loses the abundant active sites and large surface area. In this paper, large-scale graphene oxide (GO) sheets were cut and reduced to tiny reduced graphene oxide (RGO) sheets by a cell-break sonicator, for producing numerous defects, which are the center of chemisorption. Furthermore, sodium titanate nanowires functioned as a framework to help to disperse the tiny RGO sheets uniformly. And, in turn, the flexible tiny RGO sheets glued robust nanowires into a free-standing membrane. This novel composite membrane exhibited an ultra-high decoloration efficiency of 99.8% of rhodamine B in a continuous flow mode, and an outstanding absorptive capability of 1.30 × 10 mol g correlated to RGO content in batch reaction, which is about two orders of magnitude higher than other reported graphene-based absorbents. In addition, an efficient and feasible method without any heat treatment for regenerating the membrane is illustrated, and the recycled membrane retains superior decoloration efficiency. The excellent absorptive performance indicates the framework-based disperse strategy has great potential for the construction and application of defect-rich graphene.
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