Abstract
By taking advantage of cellulose, graphene oxide (GO), and the process for crosslinking using epichlorohydrin (ECH), we propose a simple and novel method to prepare GO/cellulose hydrogel with good potential to adsorb metal ions. GO nanosheets containing carboxyl and hydroxyl groups were introduced into the surface of the cellulose hydrogel with retention of the gel structure and its nanoporous property. Due to the introduction of GO, the GO/cellulose composite hydrogels exhibited good compressive strength. Adsorption capacity of Cu2+ significantly increases with an increase in the GO/cellulose ratio and GO/cellulose hydrogel showed high adsorption rates. The calculated adsorption capacities at equilibrium () for GO/cellulose hydrogel (GO:cellulose = 20:100 in weight) was up to 94.34 mg·g−1, which was much higher than that of the pristine cellulose hydrogels. Furthermore, GO/cellulose hydrogel exhibited high efficient regeneration and metal ion recovery, and high adsorption capacity for Zn2+, Fe3+, and Pb2+.
Highlights
Due to the industrialization process, the serious threat of heavy metal ions to the environment is a particular concern worldwide
The results indicated that the crosslinking reaction of cellulose and graphene oxide (GO) in NaOH/urea aqueous solution with ECH occurred
Compared with the cellulose hydrogel without GO, two distinct band observed at 1605 cm1 and
Summary
Due to the industrialization process, the serious threat of heavy metal ions to the environment is a particular concern worldwide. The hydrogels obtained from cellulose have spurred great interest in the adsorption of heavy metal ions from aqueous solutions, because of their particular physicochemical properties, such as the facility of the incorporation of different chelating groups into the polymeric networks, the internal porous structure, are eco-friendly, cost-effective, and have a high specific surface area [5]. To the best of our knowledge, there has been no attempt, and the systemic investigations have been reported, on hydrogel prepared from GO and cellulose in the NaOH/urea aqueous system by using epichlorohydrin (ECH) as cross-linker In view of these facts mentioned above, we show a simple, novel, and environmental-friendly preparation of cellulose-based hydrogel by incorporating GO into the cellulose matrix using. Due to the introduction of GO, the GO/cellulose composite hydrogels exhibited good adsorption capacities for heavy metal ions and high compressive strength. This study provided a highly efficient bioadsorbent for the removal of heavy metals from aqueous solution
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