Optimizing the removal of nitrate from aqueous solutions via reduced graphite oxide–supported nZVI: synthesis, characterization, kinetics, and reduction mechanism

Shengyan Pu, Daili Deng, Kexin Wang, Miaoting Wang, Ying Zhang, Lixiang Shangguan, Wei Chu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)

Abstract

Graphene has been considered an ideal absorbent and excellent carrier for nanoparticles. Reduced graphite oxide (rGO)–supported nanoscale zero-valent iron (nZVI@rGO) is an effective material for removing nitrate from water. nZVI@rGO nanocomposites were prepared by a liquid-phase reduction method and then applied for nitrate-nitrogen (NO 3 -N) removal in aqueous solution under anaerobic conditions. The experimental results showed that the stability and activity of the nZVI@rGO nanocomposites were enhanced compared with those of nZVI. The influence of the reaction conditions, including the initial concentration of NO 3 -N, coexisting anions, initial pH of the solution, and water temperature, on NO 3 -N removal was also investigated by batch experiments. In a neutral or slightly alkaline environment, 90% of NO 3 -N at a concentration less than 50 mg/L could be removed within 1 h, and nitrogen production was approximately 15%. The process of NO 3 -N removal by nZVI@rGO fits well with different reaction kinetics. In addition, magnetite was the main oxidation product. RGO-supported nZVI might become a promising filler in the permeable reactive barrier process for groundwater remediation.

Original languageEnglish
Pages (from-to)3932-3945
Number of pages14
JournalEnvironmental Science and Pollution Research
Volume26
Issue number4
DOIs
Publication statusPublished - 8 Feb 2019

Keywords

  • Denitrification
  • Groundwater remediation
  • Nitrate
  • nZVI@rGO
  • Reduced graphite oxide

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis

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