To enhance the adsorption performance of activated carbon fiber (ACF) on volatile organic compounds such as toluene, a series of Fe x /ACF adsorption materials were prepared by impregnation and anaerobic atmosphere calcination. The various adsorption effects of Fe x /ACF on toluene under different synthesis conditions were discussed, and both the modified and unmodified adsorption materials were characterized by using N 2 adsorption–desorption isotherms, XRF, XRD, FT-IR, SEM, and XPS etc methods. The results indicated that iron modified ACF demonstrated the optimal adsorption performance when ACF was loaded with 3 % iron and calcined at 500 °C, and it achieved a saturated toluene adsorption capacity of 218.12 mg/g, which was 24 % higher than that of the unmodified sample. And its adsorption process of toluene followed Yoon-Nelson model. The adsorption capacity was maintained at approximately 70 % when four adsorption/desorption cycle tests. The toluene adsorption performance of Fe 0.03 /ACF-500 on toluene mainly involved surface adsorption (such as n-π interaction, and π-π interaction), pore filling, and complexation between the loaded metal iron and toluene.
Untreated radioactive iodine poses a significant risk to both the environment and human health, so developing efficient adsorbents for the adsorption of radioactive iodine has become a top priority. In this study, we innovatively synthesized two ionic self-assembled single-crystal materials: HBP-PyTS and VBp-PyTS. The former comprises pyridine group organic cation and sulfonic acid group anion, while the latter contains quaternary ammonium group organic cation and sulfonic acid anion. These materials were synthesized using an environmentally friendly, simple, and relatively stable method. Besides, they were composed of ionic bonds and boasted abundant adsorption sites, which are highly effective at capturing iodine. Furthermore, a comparison of the adsorption capacity of these two materials reveals that the pyridine group is more conducive to the adsorption of iodine vapor. The HBP-PyTS material displayed excellent stability in both water and organic solvents, with an adsorption capacity of 2.2 g g −1 for I 2 at 70 °C and an iodine adsorption in iodine-cyclohexane solution of 51.2 mg g −1 . The HBP-PyTS displays a higher adsorption capacity due to the electron transfer complex mechanism and their specific surface area and pore size. This suggests that the material possesses superior adsorption properties compared to other materials, offering a promising strategy for developing a new type of iodine adsorption material.
Yi Jiang,Baoyan Zhang,Xiaobing Jiang,Zinati Baolati,Bin Zhang,Xiangze Jia,Qiang Huang
The development of materials for the control of ethylene concentration is crucial for managing fruit ripening and minimizing postharvest decay. However, commonly used ethylene removal materials, such as activated carbon and zeolite, exhibit weak affinities for ethylene, which hinders their effectiveness in adsorbing ethylene under ambient pressure. In this study, we fabricate a metal-loaded starch aerogel through the in situ reduction of metal ions on starch-fatty acid salt complexes, demonstrating enhanced ethylene adsorption properties for fruit preservation. Characterization analyses, including scanning electron microscopy, transmission electron microscopy, Fourier-transform infrared spectroscopy, micro-computational tomography and X-ray diffraction, revealed a porous structure with a low-density profile in the metal-loaded aerogels. These aerogels significantly surpassed the ethylene adsorption capacities of both the starch aerogel and ZSM-5 zeolite, with the nano-silver@aerogel and nano-copper@aerogel achieving the highest adsorption capacities of 30.5 mL g −1 and 32.5 mL g −1 , respectively. The materials exhibited excellent repeatable gas uptake capabilities and high stability in ethylene adsorption, which was attributed to the strong interactions facilitated by π-complexation. Theoretical calculations and X-ray photoelectron spectroscopy substantiated the π-complexation mechanism between ethylene and the metal centers through electron transfer. Preservation experiments with bananas treated with these aerogels showed that the aerogel effectively maintained fruit freshness by keeping the ethylene concentration at 0 ppm for at least 7 days. This work offers an eco-friendly and reproducible strategy for managing ethylene concentration during fruit storage and preservation, with promising applications in the food industry to reduce postharvest losses.
危险品化学品经营许可证（带存储）