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 মার্চ 2023
Accepted
15 মে 2023
First published
16 মে 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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