Can Cui,Xiaohuan Sun,Chuanqiang Zhou,Yingwei Liu,Huixin Xiong,Yanan Li,Jie Han
Pomegranate-like MnO 2 @polyaniline (PANI) sub-microspheres have been designed and successfully synthesized as a novel and highly effective sorbent material to remove heavy metal ions from water. Herein, pomegranate-like SiO 2 @PANI spheres were firstly fabricated by performing the oxidation polymerization of aniline in silica colloidal solution, followed by the removal of SiO 2 and in situ redox reaction between KMnO 4 and PANI . Compared with the mono-component PANI and MnO 2 materials, the obtained pomegranate-like MnO 2 @PANI sub-microspheres exhibited superior adsorption ability towards Pb(II) ions due to the synergistic effect. Influencing factors, including pH, Pb(II) ions concentration, adsorbents content and other ions on the Pb(II) ion sorption onto the MnO 2 @PANI hybrid were systematically studied. The sorption isotherm, kinetics and thermodynamic properties of the hybrids for Pb(II) ions adsorption were reflected by different models. Moreover, the adsorption ability of pomegranate-like MnO 2 @PANI sub-microspheres towards other heavy metal ions was also explored. This work would provide new insight on the design of hierarchical inorganic/organic nanosorbent.
With the continuous development of self-powered sensing systems, achieving efficient energy self-supply and high-performance signal acquisition simultaneously has emerged as a main trend for next-generation sensors. However, developing functional materials for such sensing systems is still facing crucial challenges. Herein, a multifunctional MnO 2 @PANI (MP) composite material was designed to realize a synchronized “integration” strategy. Specifically, the MP serves as a cathode in photo-assisted zinc-ion batteries (PA-ZIBs), enabling solar energy conversion and storage. The p-n heterojunction formed between MnO 2 and PANI promotes effective separation of photogenerated electron-hole pairs and enhances Zn 2+ kinetics. Therefore, the PA-ZIBs deliver a high self-charging voltage of 1.08 V and 33 % enhancement in specific capacity (reaching 249.5 mAh g −1 at 0.1 A g −1 ) under illumination. Meanwhile, it also functions as the active layer of a flexible strain sensor, achieving efficient mechanical signal detection. The core–shell structure and composite component improve both structural stability and conductivity. As a result, the sensor exhibits high sensitivity, a fast response time of 0.4 s, and excellent durability over 2000 cycles. Furthermore, proof-of-concept demonstrations validate the device’s capability to simultaneously harvest solar energy and detect physiological signals. This work offers a new solution for designing self-powered sensing systems and intelligent healthcare applications by merging energy-autonomous operation with multifunctional sensing capabilities.
危险品化学品经营许可证（带存储）