Issue 8, 2021

Self-assembly preparation of lignin–graphene oxide composite nanospheres for highly efficient Cr(vi) removal

Abstract

Recently, research interest in the application of lignin is growing, especially as adsorbent material. However, single lignin shows unsatisfactory adsorption performance, and thus, construction of lignin-based nanocomposites is worth considering. Herein, we introduced graphene oxide (GO) into lignin to form lignin/GO (LGNs) composite nanospheres by a self-assembly method. FTIR and 1H NMR spectroscopy illustrated that lignin and GO are tightly connected by hydrogen bonds. The LGNs as an environmental friendly material, also exhibit excellent performance for Cr(VI) removal. The maximum sorption capacity of LGNs is 368.78 mg g−1, and the sorption efficiency is 1.5 times than that of lignin nanospheres (LNs). The removal process of Cr(VI) via LGNs mainly relies on electrostatic interaction, and it also involves the reduction of Cr(VI) to Cr(III). Moreover, LGNs still have high adsorption performance after repeating five times with the sorption capacity of 150.4 mg g−1 in 200 mg g−1 Cr(VI) solution. Therefore, the prepared lignin–GO composite nanospheres have enormous potential as a low-cost, high-absorbent and recyclable adsorbent, and can be used in wastewater treatment.

Graphical abstract: Self-assembly preparation of lignin–graphene oxide composite nanospheres for highly efficient Cr(vi) removal

Supplementary files

Article information

Article type
Paper
Submitted
28 okt 2020
Accepted
19 jan 2021
First published
25 jan 2021
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2021,11, 4713-4722

Self-assembly preparation of lignin–graphene oxide composite nanospheres for highly efficient Cr(VI) removal

Z. Yan, T. Wu, G. Fang, M. Ran, K. Shen and G. Liao, RSC Adv., 2021, 11, 4713 DOI: 10.1039/D0RA09190A

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