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 language | English (US) |
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Pages (from-to) | 440-446 |
Number of pages | 7 |
Journal | Journal of Colloid And Interface Science |
Volume | 534 |
DOIs | |
State | Published - 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