Issue 11, 2023

A facile, green and scalable approach to fabricate hierarchical ZnAl-LDH for efficient removal of hexavalent chromium

Abstract

A convenient, green, and scalable production approach to cost-effective adsorbents with large adsorption capacity is exceedingly desirable yet challenging. Herein, a unique hierarchical zinc–aluminum layered double hydroxide (ZnAl-LDH-D) is obtained through a solid–liquid reaction with only zinc oxide (ZnO) and aluminum nitrate [Al(NO3)3] as the feedstocks. The synergistic activation involving hydrolysis of Al3+, etching of ZnO, and reconfiguration of LDH results in a fast-kinetic behavior (less than 1 min), and it is quite easy to produce at least 200 g in one batch in lab-scale. In the removal of CrVI, ZnAl-LDH-D can function steadily under different pH ranges (4–10) with a high adsorption capacity of 73.4 mg g−1 and a strong removal ability (from 10 mg L−1 to 3.3 μg L−1). Using a deuterated experiment and a series of characterization technologies, we clarified the removal mechanism of CrVI and revealed that the hydroxyl groups play a critical role in the removal process, including complexation, replacement, and reduction. Therefore, our work develops a new strategy for convenient scale-up production of ZnAl-LDH-D and provides guidance for exploring efficient adsorbents.

Graphical abstract: A facile, green and scalable approach to fabricate hierarchical ZnAl-LDH for efficient removal of hexavalent chromium

Supplementary files

Article information

Article type
Paper
Submitted
24 3 2023
Accepted
15 5 2023
First published
16 5 2023
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2023,4, 2494-2501

A facile, green and scalable approach to fabricate hierarchical ZnAl-LDH for efficient removal of hexavalent chromium

T. Liu, M. Zheng, K. Ji, X. Xue, J. Yang, M. Shao, H. Duan and X. Kong, Mater. Adv., 2023, 4, 2494 DOI: 10.1039/D3MA00140G

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