Research ArticleNo Access

Transformation of Schwertmannite to erdite nanorod via an alkaline dissolution–recrystallization process for the effective adsorption of oxytetracycline

School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, P. R. China

School of Construction and Environmental Engineering, Shenzhen Polytechnic, Shenzhen 518055, P. R. China

Science and Technology Innovation Center for Municipal Wastewater Treatment and Water Quality Protection, Northeast Normal University, Changchun 130117, P. R. China

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Zhonglei Zhang

Environmental Engineering Part 1, China North Energy Conservation and Environmental Protection Co., Ltd., Beijing 100070, P. R. China

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Xiaoshu Wang

School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, P. R. China

School of Construction and Environmental Engineering, Shenzhen Polytechnic, Shenzhen 518055, P. R. China

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Ying Wang

State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P. R. China

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Jia Zhu

School of Construction and Environmental Engineering, Shenzhen Polytechnic, Shenzhen 518055, P. R. China

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Ming Chang

State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, P. R. China

E-mail Address: [email protected]

Corresponding author.

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, and

Lei Wang

School of Construction and Environmental Engineering, Shenzhen Polytechnic, Shenzhen 518055, P. R. China

The Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control, Guilin University of Technology, Guilin 541004, P. R. China

E-mail Address: [email protected]

Corresponding author.

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https://doi.org/10.1142/S1793604721430074Cited by:3 (Source: Crossref)

This article is part of the issue:

Topical Issue: Interface-Structural Materials for Catalysis and Energy
Guest Editors: Jiangfeng Ni and Feng Yang

Abstract

Schwertmannite (schw) is a common Fe-bearing mineral in the precipitation of mine wastewater and/or steel pickling wastewater. It could be easily converted to goethite and hematite via heating or hydrothermal treatment and could be used as adsorbent to remove contaminants from wastewater. Herein, the spherical schw was converted into erdite nanorod by a simple hydrothermal method with the addition of Na₂S. Schw was spherical particle with a size of 0.4–1.5 $μ$ m. After treatment, it was converted to erdite nanorod particles with 100 nm diameter and 200 nm length. By adding MnO₂ at the $M_{M n / F e}$ ratio of 1, erdite nanorod grew radially to 1–1.5 $μ$ m, whereas MnO₂ was reductively dissolved and recrystallized to rambergite. In the absence of Fe, MnO₂ was directly transformed to octahedral alabandite. The product EN-0, prepared without MnO₂, showed the optimal $q_{m a x}$ of oxytetracycline (OTC, 7479.6 mg/g), which was 12 times that of schw. In OTC-bearing solution, erdite was unstable and automatically hydrolyzed to generate Fe–SH/Fe–OH-bearing flocs, and it exhibited abundant surface functional groups for OTC adsorption. Subsequently, the hydroxyl and amino groups on the side chain of OTC would also be complexed with the Fe–SH group to generate an OTC–Fe–S ligand, in the form of flake-like particles with a smooth surface. The formed Mn-bearing minerals, for example, rambergite and alabandite, also complexed with OTC as OTC–Mn–S ligands to form quadrangular prism with shoulder and length of 10 $μ$ m and 20–100 $μ$ m, respectively. Spherical schw was converted into a well-crystallized erdite nanorod with the addition of MnO₂, and the product showed potential applications in OTC-bearing wastewater treatment.

Keywords:

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Received 8 August 2021

Accepted 6 September 2021

Published: 22 October 2021

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Transformation of Schwertmannite to erdite nanorod via an alkaline dissolution–recrystallization process for the effective adsorption of oxytetracycline

Abstract

References

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Transformation of Schwertmannite to erdite nanorod via an alkaline dissolution–recrystallization process for the effective adsorption of oxytetracycline

Abstract

References

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