The tetracyclines removal by MgAl layered double oxide in the presence of phosphate or nitrate: Behaviors and mechanism exploration

Ping Zhang, Tao He, Han Chen, Peng Li, Mingxue Xiang, Nengshui Ding, Shuguang Deng

Research output: Contribution to journalArticle

Abstract

Pollution of tetracyclines (TCs) in swine wastewater has been a critical concern worldwide. Notably, multiple anions (e.g. PO4 3−, NO3 ) coexist in the actual environments, which could significantly influence the TCs removal. In the current study, MgAl layered double oxide (MgAl-LDO) was adopted for investigating the TC removal performance with/without PO4 3− or NO3 . In all systems, the adsorption performance exhibited two different approaches between low and high TC concentrations. In the single system, pseudo-second-order and the Freundlich model fitted well to the equilibrium adsorption data when TC concentration was below 125 mg·L−1, while the pseudo-first-order and the linear model could describe the removal process at high TC concentration (>125 mg·L−1). The maximum adsorption capacity was 83.56 mg·g−1. In the co-existing system, the adsorption capacity was slightly enhanced when TC concentration below 150 mg·L−1 however was inhibited at high concentration (>150 mg·L−1). Combined with the characterization analyses, the interaction mechanism at low concentration was primarily surface adsorption on reconstructed LDH from LDO in the TC-alone system. It is worth mention that both PO4 3− and NO3 facilitated the formation of LDH via rehydration of LDO which enhanced surface adsorption in the co-existing system. At high TC concentration, the formation of tetracycline-metal complexes played a dominant role in TC removal in the single system, whereas diminished complexation in the binary system led to the decreased TC removal. This study provides a theoretical and practical guidance for MgAl-LDO on the efficient remediation of actual tetracyclines wastewater.

Original languageEnglish (US)
Pages (from-to)124-134
Number of pages11
JournalJournal of Colloid And Interface Science
Volume578
DOIs
StatePublished - Oct 15 2020

Keywords

  • Co-existing ions
  • Complexation
  • MgAl layered double oxide (MgAl-LDO)
  • Surface adsorption
  • Tetracycline (TC)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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