Fabrication, performance and mechanism of MgO meso-/macroporous nanostructures for simultaneous removal of As(iii) and F in a groundwater system

Panpan Gao, Xike Tian, Chao Yang, Zhaoxin Zhou, Yong Li, Yanxin Wang, Sridhar Komarneni

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

The coexistence of arsenic and fluoride in groundwater has attracted extensive attention worldwide, and it is of crucial importance to efficiently remove them. In this study, hierarchically meso-/macroporous MgO using nanosheets as building blocks and with pore size distribution in the range of 10 to 150 nm was synthesized. The maximum adsorption capacities for As(iii) and F were found to be about 540.9 mg g-1 (7.22 mmol g-1) and 290.67 mg g-1 (15.30 mmol g-1), respectively. Research indicated that a broad and multimodal pore size distribution provided suitable channels for ion diffusion, which were conducive to the proximity of contaminants to the internal surfaces of the adsorbent. Thermodynamic adsorption models demonstrated that two types of active sites coexisted on the MgO surface. The adsorption mechanisms of As(iii) and F were proposed to include surface complexation as well as exchanges with hydroxyl and carbonate groups. Moreover, the removal rates of As(iii) and F for a co-contaminated groundwater sample were determined to be 98.9% and 95%, respectively.

Original languageEnglish (US)
Pages (from-to)1416-1424
Number of pages9
JournalEnvironmental Science: Nano
Volume3
Issue number6
DOIs
StatePublished - Jan 1 2016

All Science Journal Classification (ASJC) codes

  • Materials Science (miscellaneous)
  • Environmental Science(all)

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