Effect of anion co-existence on ionic organic pollutants removal over Ca based layered double hydroxide

Ping Zhang, Sida Ouyang, Peng Li, Zi Gu, Yun Huang, Shuguang Deng

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The effects of co-existing anions (NO3 or SO4 2−) on the removal of sodium dodecylsulfate (SDS), representing anionic organic pollutants, by Ca-based layered double hydroxide (CaAl-LDH-Cl) are investigated to provide fundamental insights on the ionic surfactant removal in the presence of co-existing anions, and facilitate the establishment of a practical and advanced water treatment for environmental remediation. The SO4 2− system shows higher adsorption capacity (4.43 mmol·g−1) and larger d-spacing of adsorption resultant (3.4 nm) than the control system with no co-existing anion (3.64 mmol·g−1, 3.25 nm) and the NO3 system (3.82 mmol·g−1, 3.27 nm). The macroscopic and microscopic analyses reveal that, NO3 had a little influence on the SDS removal due to strong electrolysis, while SO4 2− could significantly promote the SDS removal. Moreover, the reaction mechanism varies under different molar ratios of DS/SO4 2−.

Original languageEnglish (US)
Pages (from-to)440-446
Number of pages7
JournalJournal of Colloid And Interface Science
Volume534
DOIs
StatePublished - Jan 15 2019

Keywords

  • Calcium based layered double hydroxide (CaAl-LDH-Cl)
  • Co-existing anions
  • Nitrate
  • Removal mechanism
  • Sodium dodecylsulfate (SDS)
  • Sulphate

ASJC Scopus subject areas

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

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