Facile synthesis of 2D α-MnO2nanosheets for the removal of heavy metal ions

Hao Li; Lin Gui; Zhanyang Gao; Feipeng Ren; Honglei Zhang; Ruichao Peng

doi:10.1088/1361-6528/abe001

Facile synthesis of 2D α-MnO₂nanosheets for the removal of heavy metal ions

Nanotechnology. 2021 Mar 3;32(21). doi: 10.1088/1361-6528/abe001.

Authors

Hao Li¹, Lin Gui², Zhanyang Gao³, Feipeng Ren¹, Honglei Zhang⁴, Ruichao Peng³

Affiliations

¹ Changjiang River Scientific Research Institute, Engineering Technology Research Center of Mountain flood Geological Disaster Prevention and Control, Ministry of Water Resources, Wuhan 430010, People's Republic of China.
² China Ship Development and Design Center, Wuhan 430072, People's Republic of China.
³ Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, College of Chemistry & Molecular Sciences, Wuhan University, Wuhan 430072, People's Republic of China.
⁴ School of Resource and Environmental Sciences, Wuhan University, Wuhan 430072, People's Republic of China.

PMID: 33498039
DOI: 10.1088/1361-6528/abe001

Abstract

Removal of heavy metal ions (HMIs) has attracted great attentions due to the fact that they have serious effect on environment and human beings. Manganese oxide (MnO₂) was widely used as absorbent for the HMIs removal on account of its low-cost, eco-friendly and biocompatibility. The modification of morphological and structure is recognized as the effective route to improve the adsorption capacity. In this work, 2Dα-MnO₂nanosheets were synthesized by hydrothermal method with Al³⁺additive. With the merits of high specific surface area, high dispersity in aqueous solution and abundant surface defects, 2Dα-MnO₂nanosheets exhibited excellent HMIs adsorption performance. The maximum adsorption capacity of 2Dα-MnO₂nanosheets reached 1.604 mmol g^-1(Pb²⁺) and 0.813 mmol g^-1(Cd²⁺), respectively and can maintain stable after five cycles. Besides, the established adsorption kinetics fitted well with pseudo-second-order adsorption kinetics model. Based on the above results, 2Dα-MnO₂is efficient for the removal of HMIs and possesses remarkable practical application potential.

Keywords: adsorption; heavy metal ions; manganese oxide; selectivity; two-dimensional.