In-situ growth of manganese oxide on self-assembled 3D- magnesium hydroxide coated on polyurethane: Catalytic oxidation mechanism and application for Mn(II) removal

Seok Byum Jang; Choe Earn Choong; Saravanan Pichiah; Jae Young Choi; Yeomin Yoon; Eun Ha Choi; Min Jang

doi:10.1016/j.jhazmat.2021.127267

In-situ growth of manganese oxide on self-assembled 3D- magnesium hydroxide coated on polyurethane: Catalytic oxidation mechanism and application for Mn(II) removal

J Hazard Mater. 2022 Feb 15;424(Pt A):127267. doi: 10.1016/j.jhazmat.2021.127267. Epub 2021 Sep 20.

Authors

Seok Byum Jang¹, Choe Earn Choong², Saravanan Pichiah³, Jae Young Choi⁴, Yeomin Yoon⁵, Eun Ha Choi⁶, Min Jang⁷

Affiliations

¹ Department of Environmental Engineering, Kwangwoon University, 20 Kwangwoon-Ro, Nowon-Gu, Seoul 01897, Republic of Korea; Plasma Bioscience Research Center/Department of Electrical and Biological Physics, Kwangwoon University, Seoul 01897, Republic of Korea.
² Department of Environmental Engineering, Kwangwoon University, 20 Kwangwoon-Ro, Nowon-Gu, Seoul 01897, Republic of Korea; Plasma Bioscience Research Center/Department of Electrical and Biological Physics, Kwangwoon University, Seoul 01897, Republic of Korea. Electronic address: cce_@live.com.
³ Environmental Nanotechnology Laboratory, Department of Environmental Science and Engineering, Indian Institute of Technology (ISM), Dhanbad, India.
⁴ Green City Technology Institute, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-Gu, Seoul 02792, Republic of Korea.
⁵ Department of Civil Environmental Engineering, University of South Carolina, 300 Main Street, Columbia, SC 29208, USA.
⁶ Plasma Bioscience Research Center/Department of Electrical and Biological Physics, Kwangwoon University, Seoul 01897, Republic of Korea.
⁷ Department of Environmental Engineering, Kwangwoon University, 20 Kwangwoon-Ro, Nowon-Gu, Seoul 01897, Republic of Korea; Plasma Bioscience Research Center/Department of Electrical and Biological Physics, Kwangwoon University, Seoul 01897, Republic of Korea. Electronic address: heejaejang@gmail.com.

PMID: 34583162
DOI: 10.1016/j.jhazmat.2021.127267

Abstract

Novel integration of adsorption followed by catalytic oxidation is expected to be more beneficial for higher Mn(II) removal performance. We prepared self-assembled 3D flower-like Mg(OH)₂ coated on granular-sized polyurethane (namely FMHP) via hydrothermal method at 120 °C under a facile synthesis route. The optimized material, FMHP prepared with 7 g MgO and 20 g polyurethane (FMH_0.35P), achieved up to 351.2 mg g^-1 Mn(II) removal capacity by Langmuir isotherm model. Besides, FMHP exhibited high Mn(II) removal in a wide range of NaCl concentration (0~0.1 M) and pH 2-9. Notably, through consecutive kinetics, BET, XPS, XRD, FESEM, and TEM analyses, it was found that the MnO_x layer grows in-situ via ion exchange with Mg(II) on FMHP and further boosts the Mn(II) removal via catalytic oxidation during the Mn(II) removal process. Further, column experiments revealed that the FMH_0.35P exhibited superior Mn(II) removal capacities up to 135.9 mg g^-1 and highly compatible treatment costs ($0.062 m^-3) compared to conventional chemical processes. The granular-sized FMH_0.35P prepared by economic precursors and simple synthesis route revealed a high potential for Mn(II) containing water treatment due to its high removal capacities and easy operation.

Keywords: Catalytic oxidation; Manganese removal; Mg(OH)(2); Polyurethane.