Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan 430030, China.
Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan 430030, China.
J Hazard Mater. 2020 Dec 5;400:123184. doi: 10.1016/j.jhazmat.2020.123184. Epub 2020 Jun 11.
With the increasing production and rapid market penetration as well as the confirmation of the toxic effects, silver nanoparticles (AgNPs) are one kind of newly emerging environmental contaminants of high concern. It is urgent to develop the efficient method to remove them from the environment. In this study, the sponge-like hierarchically porous thiourea-formaldehyde (TF) resin rich with nitrogen and sulfur was for the first time proposed as the adsorbent to achieve this goal. With enormous interconnected layer structure and plentiful macropores, the porous TF resin provided abundant available interaction sites and fast mass transfer to adsorb citrate stabilized AgNPs (citrate-AgNPs). Fast adsorption rate and high adsorption capacity (2478 mg/g) were obtained based on the electrostatic and metal-ligand interactions. Heterogeneous aggregation and simultaneous adsorption contributed to this removal process. Furthermore, with the assistance of NaCl, the porous TF resin exhibited largely enhanced removal efficiency towards citrate-AgNPs up to 98.7 % in 5 min, possibly due to the co-operation of adsorption and coagulation. This study proposed a promising adsorbent to remove AgNPs and provided a referential strategy to design highly efficient adsorbents for removal of nanoparticles.
随着生产的增加和市场的快速渗透，以及毒性作用的确认，银纳米颗粒（AgNPs）是一种新出现的高关注环境污染物。迫切需要开发有效的方法从环境中去除它们。在这项研究中，首次提出了具有丰富氮和硫的海绵状分级多孔硫脲-甲醛（TF）树脂作为吸附剂来实现这一目标。多孔 TF 树脂具有巨大的互联层结构和丰富的大孔，为吸附柠檬酸稳定的 AgNPs（柠檬酸-AgNPs）提供了丰富的可用相互作用位点和快速的传质。基于静电和金属配体相互作用，获得了快速的吸附速率和高的吸附容量（2478mg/g）。非均相聚集和同时吸附有助于这个去除过程。此外，在 NaCl 的帮助下，多孔 TF 树脂在 5 分钟内对柠檬酸-AgNPs 的去除效率大大提高，达到 98.7%，可能是由于吸附和凝聚的协同作用。本研究提出了一种有前途的去除 AgNPs 的吸附剂，并为设计高效去除纳米颗粒的吸附剂提供了一种参考策略。
