Key Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China; University of Science and Technology of China, Hefei 230026, China.
Key Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China.
J Colloid Interface Sci. 2021 Oct 15;600:752-763. doi: 10.1016/j.jcis.2021.05.071. Epub 2021 May 18.
Developing cheap, green, efficient and renewable adsorbents to address the issue of heavy metal pollution is highly desired for satisfying the requirements of economy sustainability and water security. Herein, a composite aerogel composed of bacterial cellulose (BC) and poly(amidoxime) (PAO) has been fabricated via a facile and scalable self-assembly and in situ oximation transformation for heavy metals removal. Benefiting from the unique three-dimensional (3D) interconnected porous architecture and high density of amidoxime functional moieties, the developed PAO/BC composite aerogel is capable of efficiently sequestrating heavy metals with exceptional sorption capacities, e.g. 571.5 mg g for Pb, 509.2 mg g for Cu, 494 mg g for Zn, 457.2 mg g for Mn, and 382.3 mg g for Cd, outperforming most reported nano-adsorbents. Meanwhile, the sorption equilibrium for the investigated five heavy metals is achieved within 25 min with high removal efficiencies. Significantly, the developed PAO/BC composite aerogels possess superior reusability performance. Furthermore, the PAO/BC aerogels-packed column can continuously and effectively treat the simulated wastewater with multiple heavy metals coexisting to below the threshold value in the drinking water recommended by World Health Organization (WHO), highlighting its feasibility in the complex environmental water.
开发廉价、绿色、高效且可再生的吸附剂以解决重金属污染问题，对于满足经济可持续性和水安全的要求至关重要。在此，通过简便且可扩展的自组装和原位肟化转化，制备了一种由细菌纤维素（BC）和聚（偕胺肟）（PAO）组成的复合气凝胶，用于去除重金属。得益于独特的三维（3D）相互连接的多孔结构和偕胺肟官能团的高密度，所开发的 PAO/BC 复合气凝胶能够高效地螯合重金属，具有出色的吸附容量，例如对 Pb 的吸附容量为 571.5mg/g，对 Cu 的吸附容量为 509.2mg/g，对 Zn 的吸附容量为 494mg/g，对 Mn 的吸附容量为 457.2mg/g，对 Cd 的吸附容量为 382.3mg/g，优于大多数报道的纳米吸附剂。同时，对于所研究的五种重金属，吸附平衡在 25 分钟内达到，去除效率高。重要的是，所开发的 PAO/BC 复合气凝胶具有优异的可重复使用性能。此外，PAO/BC 气凝胶填充柱可以连续有效地处理多种重金属共存的模拟废水，使其浓度降至世界卫生组织（WHO）推荐的饮用水标准以下，突出了其在复杂环境水中的可行性。
