NDLI: Soy protein-based polyethylenimine hydrogel and its high selectivity for copper ion removal in wastewater treatment

Content Provider	Royal Society of Chemistry (RSC)
Author	Liu, Jie Yao, Jinrong Chen, Xin Huang, Yufang Shao, Zhengzhong Su, Dihan
Copyright Year	2017
Abstract	The pollution of water resources has become a worldwide concern because of the indiscriminate disposal of heavy metal ions and toxic organics in the past few decades. In this study, we use a sustainable, low cost, and abundant plant protein, soy protein isolate (SPI) as a matrix, polyethyleneimine (PEI) as a functional component to prepare the SPI/PEI composite hydrogels through a facile chemical crosslinking method. The results show that the SPI/PEI composite hydrogels can effectively adsorb Cu(II) ions from aqueous solution. In particular, the SPI/PEI composite hydrogel with a 50% PEI content demonstrates an excellent selectivity for the removal of Cu(II) ions when co-existing competitive heavy metal ions, including Zn(II), Cd(II), and Pb(II), especially the selectivity coefficient for Cu(II)/Zn(II), reaches about 250. Furthermore, the adsorbed Cu(II) ions in the composite hydrogel can be reduced easily in situ by NaBH4 to form uniformly dispersed copper nanoparticles (Cu NPs), which gives a Cu NP-loaded-SPI/PEI composite hydrogel. Such a material is found to be able to act as a catalyst to catalyse the model reaction, i.e., the reduction of 4-nitrophenol with a high efficiency. These results suggest that such a SPI-based hydrogel is a good candidate to selectively adsorb and recycle copper element for the waste disposal industry. In addition, we also provide a strategy to keep the natural resources sustainable, i.e., to select a natural and sustainable material (SPI) to protect the environment (wastewater treatment), and to recycle metals (copper and possibly others).
Starting Page	4163
Ending Page	4171
Page Count	9
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	5
Issue Number	8
Journal	Journal of Materials Chemistry A
DOI	10.1039/c6ta10814h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Heavy metals Protein Soy protein Composite material Polyethylenimine Gel Lead Sodium borohydride Copper 4-Nitrophenol Wastewater
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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