4.8 Article

High-capacity removal of oxytetracycline hydrochloride from wastewater via Mikania micrantha Kunth-derived biochar modified by Zn/Fe-layered double hydroxide

期刊

BIORESOURCE TECHNOLOGY
卷 361, 期 -, 页码 -

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ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127646

关键词

Mikania micrantha Kunth; Biochar; Layered double hydroxide; Oxytetracycline hydrochloride; Adsorption

资金

  1. Guangdong Provincial Key Labora- tory of Eco-Circular Agriculture [2019B030301007]
  2. Joint Project of Laboratory of Lingnan Modern Agriculture [NT2021010]
  3. National Natural Science Foundation of China [U1701236, 32071641]

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In this study, ZnFe-LDH/MBC, synthesized from Mikania micrantha Kunth-derived biochar and Zn/Fe layered double hydroxide (LDH), demonstrated excellent performance in removing oxytetracycline (OTC) from water. ZnFe-LDH/MBC exhibited stability and efficiency in OTC adsorption at different pH levels and under interfering conditions with co-existing ions, as well as outstanding regeneration capabilities during adsorption-desorption cycles. The removal of OTC by ZnFe-LDH/MBC involved several processes, including pore filling, hydrogen bonding force, electrostatic interaction, pi-pi interaction, and complexation.
Antibiotic contamination in water has been an increasing global concern, and how to effectively remove antibiotics (e.g., oxytetracycline [OTC] hydrochloride) from wastewater becomes imperative. In this study, the biochar derived from an invasive plant (Mikania micrantha Kunth) was synthesized with Zn/Fe- layered double hydroxide (LDH) by co-precipitation method (ZnFe-LDH/MBC) to remove OTC from water. ZnFe-LDH/MBC posed the highest OTC removal performance of 426.61 mg/g. ZnFe-LDH/MBC exhibited stability and efficiency in OTC adsorption at different pH levels and under interfering conditions with co-existing ions, as well as outstanding regeneration capabilities during adsorption-desorption cycles. Furthermore, the removal of OTC by ZnFe-LDH/MBC was mediated by several processes including pore filling, hydrogen bonding force, electrostatic interaction, pi-pi interaction, as well as complexation. Consequently, ZnFe-LDH/MBC has excellent potential for the purification of OTC pollutants that is low-cost, efficient, and environmentally friendly.

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