Yan Li,Yanan Wen,Lihuan Wang,Jianxin He,Salem S. Al-Deyab,Mohamed El-Newehy,Jianyong Yu,Bin Ding
By virtue of the affinity of pyromellitic dianhydride (PMDA) for lead(II) ion (Pb2+) and the inherent structural merits of electrospun nanofibrous membranes, a novel solid-phase nanofibrous material was facilely fabricated via the modification of deacetylated cellulose acetate membranes with PMDA (DCA-PMDA). The resultant DCA-PMDA can be applied for the simultaneous naked-eye detection and removal of Pb2+ from water matrixes by simple filtration followed by treatment with Na2S solution. Importantly, the color of the DCA-PMDA changes from white to dark yellow-brown due to the formation of PbS, which can be leveraged for the colorimetric detection of Pb2+ by the naked eye with a detection limit of 0.048 μM. Under the same circumstances, the maximum adsorption capacity was determined to be as high as 326.80 mg g−1. Furthermore, the extraction of Pb2+ from DCA-PMDA was possible with HNO3. The regenerated membrane that remained maintained the high sensitivity to Pb2+ and exhibited almost the same adsorption capacity as the original membrane. Therefore, the proposed membrane offers a cost-effective material that can be considered as a viable alternative for effectively detecting and removing toxic Pb2+ from water samples.
As a recent focal point of research, soft electronics encompass various factors that synergistically enhance their mechanical properties and ensure stable electrical performance. However, challenges such as immiscible conductive fillers, poor phase interfaces, and unstable conductive networks hinder the overall efficacy of these materials. To address these issues, a hydrogel featuring an oriented interpenetrating network structure (OIPN) is developed. The pyrrole monomer is in situ polymerized within the confined space of PVA macromolecular chains at low temperatures, resulting in a double network structure. Subsequently, the conductive hydrogel with an OIPN configuration is synthesized through directional freezing combined with salting out techniques. After doping phytic acid (IP6), non-covalent bonds dynamically reinforce the dual network architecture and the pathways for conductivity transfer. Due to its distinctive OIPN structure, the hydrogel containing 50% PPy and 2.3% IP6 exhibits remarkable conductivity (75 µs mm −1 ), excellent stretchability (400%), optimal multi-stimuli sensing responses (mechanical and gaseous stimuli), and outstanding device stability (over 2600 cycles at 40% strain). This multifunctional hydrogel presents a promising strategy for advancing applications in soft electronic materials.
危险品化学品经营许可证（带存储）