Micro-nanostructured Δ-Bi2O3 with surface oxygen vacancies as superior adsorbents for SeOx 2− ions

Long Liu, Ning Chen, Yong Lei, Xuyan Xue, Lina Li, Jiancheng Wang, Sridhar Komarneni, Huaiyong Zhu, Dongjiang Yang

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Removal of the toxic selenium compounds, selenite (SeO3 2−) and selenate (SeO4 2−), from contaminated water is imperative for environmental protection in both developing and industrialized countries. Providing high selectivity adsorbents to the target ions is a big challenge. Here we report that micro sphere-like δ-Bi2O3 (MS-δ-Bi2O3) with surface oxygen vacancy defects can capture hypertoxic SeOx 2− anions from aqueous solutions with superior capacity and fast uptake rate. High capture selectivity to SeO3 2− anions is observed, since the O atoms of SeO3 2− anions fill the oxygen vacancies on the (111) facet of δ-Bi2O3 forming a stable complex structure. This mechanism is distinctly different from other known mechanisms for anion removal, and implies that we may utilize surface defects as highly efficient and selective sites to capture specific toxic species. Thus, we present a new route here to design superior adsorbents for toxic ions.

Original languageEnglish (US)
Pages (from-to)279-287
Number of pages9
JournalJournal of Hazardous Materials
Volume360
DOIs
StatePublished - Oct 15 2018

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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