Compressible nanowood/polymer composite adsorbents for wastewater purification applications
Compressible nanowood/polymer composite adsorbents for wastewater purification applications
复制标题
用于废水净化应用的可压缩纳米木/聚合物复合吸附剂
DOI：
10.1016/j.compscitech.2020.108320
复制
发表时间：
2020-09-29
影响因子：
9.1
通讯作者：
Yang, Zhuohong
中科院分区：
文献类型：
--
作者：
Chu, Zhuangzhuang;Zheng, Peitao;Yang, Zhuohong
重金属污染由于对公众健康和环境的潜在威胁而引起了人们的严重关注。吸附法是去除废水中金属离子的重要方法，但现有的吸附剂存在成本高、吸附效率低、循环性能差等问题。本文中，通过用聚乙烯亚胺（PEI）对木材（NW）进行简单的化学处理来制备具有多孔结构的可压缩复合材料（PEI-NW）。用PEI改性NW能够有效吸附金属离子。PEI-NW显示出优异的吸附效率。吸附的重金属离子可以通过简单地将PEI-NW浸入解吸溶液中而快速解吸。由于PEI-NW具有良好的可压缩性，可通过挤压法重复使用。该吸附剂在50次吸附-脱附循环后仍能保持60%的吸附效率。这种可压缩复合材料为设计用于去除重金属离子的高效清洁剂提供了新的见解，并为生物质基复合材料的功能化发展提供了方法。
Heavy metal pollution has raised serious concerns due to the potential threat to public health and the environment. Adsorption is an important method for removing metal ions from wastewater, but many current adsorbents are limited by high cost, low adsorption efficiency and poor cyclability. Herein, a compressible composite (PEI-NW) with a porous structure is prepared by a simple chemical treatment of nanowood (NW) with polyethyleneimine (PEI). Modification of NW with PEI enables the efficient adsorption of metal ions. PEI-NW shows excellent adsorption efficiency. Adsorbed heavy metal ions can be rapidly desorbed by simply immersing PEI-NW in a desorption solution. PEI-NW can be reused by employing the squeezing method because of its excellent compressibility. The adsorbent can remove the heavy metal ions from polluted water with 60% of adsorption efficiency even after 50 adsorption-desorption cycles. This compressible composite provides new insights for the design of efficient cleaners for heavy metal ion removal and offers approaches to the development of functionalization of biomass-based composites.