TEMPO-Mediated Oxidation for Facilitating In Situ Crystallization of Zeolites on Plant Fibers

In this study, a high-load zeolite/plant fiber composite was successfully fabricated based on the coordination interaction between aluminum ions and carboxyl groups. The bamboo fibers (BF) undergo controlled TEMPO-mediated oxidation modification, followed by the in situ generation of NaA zeolites through hydrothermal crystallization. This result confirmed that the zeolite content of the NaA/BF achieved a maximum value of 63.9%, while exhibiting a specific surface area of 431.5 m 2 /g. The modified composite (NaA/BF@Co) was subsequently synthesized through a sol-gel impregnation process utilizing cobalt chloride aqueous solution. Then the NaA/BF@Co paper exhibited a remarkably high hydroscopic responsiveness, undergoing a pronounced chromatic transition within seconds when exposed to controlled environmental conditions at 50% relative humidity (RH). Graphical The bamboo fiber (BF) was subjected to TEMPO-mediated oxidation, and then it was mixed with the NaAlO 2 solution and NaOH solution. Subsequently, Na 2 SiO 3 9H 2 0 solution was added, and a high-load zeolite/bamboo fiber composite (NaA/BF) was obtained through hydrothermal synthesis. The NaA/BF was immersed in a cobalt chloride solution to obtain the NaA/BF@Co. The NaA/BF@Co paper was prepared by the sheet former and exhibited high water sensitivity.