Liuting Mo,Huiwen Pang,Yi Tan,Shifeng Zhang,Jianzhang Li
The utilization of easily recyclable biosorbent material with ultrahigh adsorption capacity for the removal of heavy metal ions from aqueous environments is an important step towards eradicating water pollution worldwide. In this study, a novel amino-functionalized nanocellulose aerogel adsorbent for efficient and reversible recycle capture of Cu(II) ions was fabricated via self-assembly of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) oxidized cellulose nanofibril (TO-CNF) crosslinked Trimethylolpropane-tris-(2-methyl-1-aziridine) propionate (TMPTAP) and polyethyleneimine (PEI). The TO-CNF was spontaneously reacted with TMPTAP via a ring-opening reaction in an aqueous solution at room temperature and then cross-linked with PEI. The resultant TO-CNF/TMPTAP/PEI aerogel showed a 3D multi-wall perforated cellular structure with plentiful amino groups and oxygen-containing groups. The unique architecture of the TO-CNF/TMPTAP/PEI aerogel allowed an ultrahigh Cu(II) ion adsorption capacity of 485.44 mg/g as-calculated by the Langmuir isotherm model, which is almost the highest value among known biodegradable cellulose-based adsorbents. The TO-CNF/TMPTAP/PEI aerogels also can restore their original architecture after regeneration by EDTA-2Na treatment and be utilized more than four cycles without significant degradation of adsorption performance. The ultrahigh adsorption capacity, good recyclability and reversibility, excellent chemical and structural stability, and ease of separation make these composite aerogels ideal materials for the adsorption of Cu(II) ions in practical wastewater treatment applications.
Wenchang Wei,Shangshi Huang,Xianhao Fan,Chuanyang Li,Jinliang He
With the continual increase in power density and ongoing miniaturization of electronic devices, the design and fabrication of insulating materials must simultaneously deliver high mechanical strength and excellent thermal conductivity to mitigate localized overheating and extend service life. In this study, a nano-MgO/Tempo-oxidized nanocellulose/cellulose (MgO/TO-CNF/cellulose) composite insulating paper was developed through the integration of molecular dynamics (MD) simulations and experimental validation, resulting in synergistic enhancements in mechanical, thermal, and thermal-aging properties. MD simulations revealed that the incorporation of nanofillers significantly reduced the free volume fraction, strengthened intermolecular interactions, and suppressed dipole fluctuations via interfacial hydrogen-bond networks and confinement effects, thereby increasing the mechanical modulus and glass transition temperature while lowering the dielectric constant. Experimentally, the P6 composite paper exhibited the best comprehensive performance, with tensile strength, thermal conductivity, and power-frequency breakdown strength increased by 37.29%, 155.04%, and 32.5%, respectively, compared to pristine cellulose paper. Meanwhile, its dielectric loss and permittivity were markedly reduced, the volume resistivity reached 4.67 × 10 14 Ω·m, and both the degree of polymerization (DP) and electrical stability remained high after 120 days of thermal aging. These results indicate that the synergistic effect between TO-CNF and nano-MgO enables the construction of a multiscale reinforcing network and interfacial trap structures, providing a promising strategy for the design and fabrication of long-lived, high-performance bio-based insulating materials.
危险品化学品经营许可证（带存储）