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Sorption of chlorophenols on microporous minerals: mechanism and influence of metal cations, solution pH, and humic acid
- Source :
- Environmental Science and Pollution Research. 23:19266-19280
- Publication Year :
- 2016
- Publisher :
- Springer Science and Business Media LLC, 2016.
-
Abstract
- Sorption of 2-chlorophenol (2-CP), 2,4-dichlorophenol (2,4-DCP), and 2,4,6-trichlorophenol (2,4,6-TCP) on a range of dealuminated zeolites were investigated to understand the mechanism of their sorption on microporous minerals, while the influence of common metal cations, solution pH, and humic acid was also studied. Sorption of chlorophenols was found to increase with the hydrophobicity of the sorbates and that of the microporous minerals, indicating the important role of hydrophobic interactions, while sorption was also stronger in the micropores of narrower sizes because of greater enhancement of the dispersion interactions. The presence of metal cations could enhance chlorophenol sorption due to the additional electrostatic attraction between metal cations exchanged into the mineral micropores and the chlorophenolates, and this effect was apparent on the mineral sorbent with a high density of surface cations (2.62 sites/nm(2)) in its micropores. Under circum-neutral or acidic conditions, neutral chlorophenol molecules adsorbed into the hydrophobic micropores through displacing the "loosely bound" water molecules, while their sorption was negligible under moderately alkaline conditions due to electrostatic repulsion between the negatively charged zeolite framework and anionic chlorophenolates. The influence of humic acid on sorption of chlorophenols on dealuminated Y zeolites suggests that its molecules did not block the micropores but created a secondary sorption sites by forming a "coating layer" on the external surface of the zeolites. These mechanistic insights could help better understand the interactions of ionizable chlorophenols and metal cations in mineral micropores and guide the selection and design of reusable microporous mineral sorbents for sorptive removal of chlorophenols from aqueous stream.
- Subjects :
- Iron
Health, Toxicology and Mutagenesis
Inorganic chemistry
02 engineering and technology
010501 environmental sciences
01 natural sciences
Hydrophobic effect
chemistry.chemical_compound
Adsorption
Cations
Environmental Chemistry
Humic acid
Zeolite
Humic Substances
0105 earth and related environmental sciences
Chlorophenol
chemistry.chemical_classification
Minerals
Aqueous solution
Sorption
General Medicine
Microporous material
Hydrogen-Ion Concentration
021001 nanoscience & nanotechnology
Pollution
Solutions
chemistry
Zeolites
Environmental Pollutants
0210 nano-technology
Hydrophobic and Hydrophilic Interactions
Porosity
Copper
Chlorophenols
Subjects
Details
- ISSN :
- 16147499 and 09441344
- Volume :
- 23
- Database :
- OpenAIRE
- Journal :
- Environmental Science and Pollution Research
- Accession number :
- edsair.doi.dedup.....02239cdccd1107eb190e4eb215d42c61