Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, China; Department of Chemistry, City University of Hong Kong, Hong Kong SAR.
Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
J Hazard Mater. 2022 Jan 5;421:126754. doi: 10.1016/j.jhazmat.2021.126754. Epub 2021 Jul 28.
Developing a cost-effective, stable, and recyclable adsorbent with high adsorption capacity and rapid adsorption kinetics is highly demanded for water treatment but has been proven challenging. Herein, we report a one-step strategy to synthesize tough porous nanocomposite hydrogel, by introducing biochar nanoparticles and interconnected pores into a polyacrylamide hydrogel matrix as an exemplary system. The polyacrylamide hydrogel provides the overall mechanical strength to carry loads and facilitate recycling, the biochar provides adsorptive locus for high adsorption capacity, and the interconnected pores expedite solvent transport for rapid adsorption kinetics. Mechanical characterizations manifest that the porous biochar hydrogel possesses a tensile strength of 128 kPa, a stretchability of 5.9, and a toughness of 538 J m. Porous structure analysis reveals that the hydrogel contains an increscent specific surface area by 441% and an augmented pore volume by 279% compared to pure polyacrylamide hydrogel. Experiments pertaining to adsorption isotherms and kinetics, with methylene blue as the model adsorbate, indicate enhanced adsorption performances. The tough hydrogel also allows facile recycling and maintains mechanical robustness after five regeneration cycles. Furthermore, biocompatibility is endorsed by cytotoxicity test. The proposed method could open an ample space for designing and synthesizing tough porous nanocomposite hydrogels for water treatment.
开发一种具有高吸附容量和快速吸附动力学的经济高效、稳定和可回收的吸附剂，对于水处理来说是非常需要的，但已被证明具有挑战性。在此，我们报告了一种一步策略，通过将生物炭纳米颗粒和相互连接的孔引入聚丙烯酰胺水凝胶基质中，来合成坚韧的多孔纳米复合水凝胶，作为一个典型的体系。聚丙烯酰胺水凝胶提供了整体机械强度来承载负荷并促进回收，生物炭提供了高吸附容量的吸附位置，而相互连接的孔则加速了溶剂的传输以实现快速的吸附动力学。力学特性表明，多孔生物炭水凝胶具有 128 kPa 的拉伸强度、5.9 的拉伸性和 538 J m 的韧性。多孔结构分析表明，与纯聚丙烯酰胺水凝胶相比，水凝胶的比表面积增加了 441%，孔体积增加了 279%。涉及吸附等温线和动力学的实验，以亚甲蓝作为模型吸附剂，表明吸附性能得到了增强。坚韧的水凝胶还可以在五次再生循环后轻松回收并保持机械强度。此外，细胞毒性试验证明了其生物相容性。该方法为设计和合成用于水处理的坚韧多孔纳米复合水凝胶开辟了广阔的空间。
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