文献类型：期刊文献

英文题名：Adsorption and recovery of palladium from aqueous solution by silica gel incorporated chitosan-based composite nanofibers

作者：Zhang, Qi[1];Meng, Huibiao[2];Shi, Yonggen[2];Shao, Linjun[1];Xing, Guiying[1];Zhang, Xianman[2]

机构：[1]Shaoxing Univ, Zhejiang Key Lab Alternat Technol Fine Chem Proc, Shaoxing 312000, Zhejiang, Peoples R China;[2]Zhejiang Zhongxin Fluoride Mat Co Ltd, Shaoxing 312000, Zhejiang, Peoples R China

年份：2025

外文期刊名：CELLULOSE

收录：SCI-EXPANDED(收录号：WOS:001533617100001)、、Scopus(收录号：2-s2.0-105011160869)、WOS

基金：Not applicable.

语种：英文

外文关键词：Chitosan; Palladium; Adsorption; Silica gel; Nanofibers

外文摘要：The efficient adsorption of precious palladium metal ions from industrial wastewater is crucial for both reducing environmental pollution and recycling valuable palladium resources. In this research, a combination of electrospinning and annealing treatment was employed to fabricate low-cost and stable silica gel incorporated chitosan composite nanofibers, which were served as an efficient adsorbent for adsorbing Pd2+ ions from aqueous solution. The fiber morphology was analyzed by scanning electron microscopy (SEM). Brunauer-Emmett-Teller (BET) analysis and positron annihilation lifetime spectroscopy (PALS) were employed to analyze the microstructure. The surface area of composite nanofibers reaches the maximum of 81.46 m(2)/g with 23.1% loading of silica gel. These fiber adsorbents were used to adsorb the Pd2+ ions in aqueous solution and the related factors of silica gel content, the annealing temperature and the adsorption parameters (e.g. adsorption time, solution pH, and initial Pd2+ concentration) were investigated and optimized. The adsorption results demonstrate that the unique fibrous structure and the incorporation of silica gel significantly enhance the adsorption efficiency for Pd2+ ions with a maximum adsorption capacity of similar to 113 mg/g. The adsorption mechanism analysis reveals the involvement of chelation and electrostatic interaction between the amino groups in chitosan and Pd2+ ions. Thermodynamic analysis indicates that the adsorption process is endothermic and spontaneous with Delta H-0 and Delta S-0 values of - 26.59 kJ/mol and 96.02 J/mol K, respectively. Moreover, the fibrous adsorbent exhibits outstanding recyclability, retaining 85.2% of its initial adsorption capacity after five successive reuse cycles. In conclusion, this low-cost and high-performance fibrous adsorbent holds great potential for the efficient separation and recovery of precious Pd2+ ions from industrial wastewater.