Back to Search
Start Over
Cosorption of Zn(II) and chlortetracycline onto montmorillonite: pH effects and molecular investigations
- Source :
- Journal of Hazardous Materials. 424:127368
- Publication Year :
- 2022
- Publisher :
- Elsevier BV, 2022.
-
Abstract
- Ionic antibiotics and metals generally coexist, and their interaction can affect their sorption behaviors onto soil minerals, therefore determining their environmental hazards. This study investigated the sorption and cosorption of Zn(II) and chlortetracycline (CTC) onto montmorillonite at different solution pH (3−10) using batch experiments and extended X-ray absorption fine structure (EXAFS) analysis. The Langmuir model could reproduce well the sorption isotherms of Zn(II) and CTC. The presence of CTC/Zn(II) could promote the maximum sorption capacity (Qm) of Zn(II)/CTC, based on site energy distribution (SED) theory. Generally, Zn(II) sorption increased with pH increasing. Comparatively, CTC sorption decreased as pH increased till approximately pH 5.0, then increased continuously with pH increasing. Both CTC and Zn(II) co-existence enhanced their individual sorption in both acidic and neutral environments. The processes behind CTC and Zn(II) sorption mainly included cation exchange and surface complexation. The EXAFS data evidenced that the presence of CTC could alter the species of Zn(II) on montmorillonite via surface complexation at pH 4.5 and 7.5, with Zn-CTC complexes being the predominant species on montmorillonite at pH 7.5. At pH 9.5, Zn(II) may exist onto montmorillonite in precipitated form similar to Zn-Al hydrotalcite-like compound (HTlc) regardless of CTC presence.
- Subjects :
- Chlortetracycline
Environmental Engineering
Health, Toxicology and Mutagenesis
Ionic bonding
chemistry.chemical_element
Zinc
chemistry.chemical_compound
symbols.namesake
medicine
Environmental Chemistry
Waste Management and Disposal
Extended X-ray absorption fine structure
Langmuir adsorption model
Sorption
Hydrogen-Ion Concentration
Pollution
Montmorillonite
chemistry
Bentonite
symbols
Adsorption
Absorption (chemistry)
Nuclear chemistry
medicine.drug
Subjects
Details
- ISSN :
- 03043894
- Volume :
- 424
- Database :
- OpenAIRE
- Journal :
- Journal of Hazardous Materials
- Accession number :
- edsair.doi.dedup.....3a95ae066fe704dddcbaf19aca5b0f45