Although nano‐porous materials are widely used, they are still difficult to prepare in large size and expand flexibly. In this work, a new method for the synthesis of porous materials is proposed. First, the block polymers were prepared by atom transfer radical polymerization. Through electrostatic spinning, the fiber films were fabricated, then the fibers were modified by surface post‐treatment and related Friedel–Crafts alkylation reaction. The pore and CO2 adsorption properties of the porous fiber films are characterized by nitrogen adsorption–desorption isotherm. In order to improve the pore properties and CO2 adsorption properties of thin films, the additives and pretreatment process are optimized. The maximum specific surface area of the porous fiber membrane is determined to be 640 m2/g, and the CO2 adsorption capacity is high up to 36.3 wt.% (8.68 mmol/g). Moreover, the porous fiber membrane derived from this strategy is superior in the aspects of large size, convenient adjustment and simple processing, which makes up for the drawbacks of traditional porous materials. The fiber membrane obtained by this strategy has high productivity, and the fiber membrane is easy to be postprocessed, which can be integrated into functional devices, and is widely used.

No abstract

Zinc is one of the heavy metals present in textile wastewater with high concentrations. However, the chronic toxic effects of zinc on aquatic vertebrates are still ambiguous. Zinc accumulation in zebrafish after chronic zinc exposure and toxic effects on the intestines, muscles, and gills were investigated in this study. The results showed that a significant accumulation of zinc in the intestine, muscle, and gill was observed after 25 d of zinc exposure. The toxic effects of zinc were mainly in the form of zinc-induced oxidative stress in zebrafish, potential neurotoxicity, and changes in intestinal microbes. Significant changes in the levels of superoxide dismutase, catalase, metallothionein, glutathione, and malondialdehyde indicated that zinc damaged the antioxidant system of adult zebrafish. Zinc exposure resulted in a significant decrease in acetylcholinesterase activity and abnormal neural signaling. Furthermore, zinc exposure resulted in increased intestinal microbial richness and decreased the Simpson index in adult zebrafish. At the phylum and genus levels, the predominant microbes in the intestine are altered by zinc. In summary, this study provides an analysis of the toxic effects of chronic zinc exposure on adult zebrafish and the potential mechanisms, which are important for assessing the dual effects of zinc on aquatic organisms.

No abstract

No abstract