AI Article Synopsis
- Antibiotic contaminants can be adsorbed onto clay minerals, with experiments showing that montmorillonite has higher sorption capacities for sulfadiazine (SDZ) and ciprofloxacin (CIP) than kaolinite.
- The study used Freundlich and Langmuir models, finding that pH levels significantly impact how well SDZ and CIP adsorb, particularly at pH 5.
- When both antibiotics were present, CIP reduced the adsorption of SDZ onto clays, with complex interactions examined through various competitive sorption models, indicating that pH and chemical characteristics influenced the competitive dynamics.
Article Abstract
Antibiotic contaminants, which are generally present in bi-solute systems, can be competitively adsorbed onto clays. Single- and bi-solute sorptions of sulfadiazine (SDZ) and ciprofloxacin (CIP) onto montmorillonite and kaolinite were investigated at pH values of 5 and 8. Freundlich and Langmuir models were used and fit the experimental data well for single-solute sorption. The sorption isotherms were nonlinear ( = 0.265-0.730), and the maximum sorption capacities () of the SDZ and CIP onto montmorillonite were higher than those onto kaolinite. The octanol-water distribution ratio (), cation exchange capacity (CEC), Brunauer-Emmett-Teller (BET) surface area (A), pore size, point of zero charge (pH), and basal spacing predominantly affected the Freundlich constant () and of SDZ and CIP at pH 5 more than SDZ and CIP at pH 8. For bi-solute sorption, the presence of CIP inhibited the SDZ sorption onto montmorillonite and kaolinite. Competitive sorption models such as Sheindorf-Rebhun-Sheintuch (SRS), Murali-Aylmore (M-A) and the modified extended Langmuir model (MELM) were used; of these, the MELM provided the best prediction with SDZ sorption onto montmorillonite at pH 8 and CIP onto kaolinite at pH 5 and 8 in SDZ/CIP system occurring synergistically, whereas others occurred antagonistically. The distribution coefficient () of the bi-solute sorption decreased with increasing pH in the order cationic > neutral > anionic for SDZ and cationic > zwitterionic > anionic for CIP, which resembled the of single-solute sorption. Fourier transform spectroscopy (FT-IR) spectra indicated that amine in SDZ and keto oxygen in CIP were responsible for the interactions with the montmorillonite and kaolinite.
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| http://dx.doi.org/10.1080/09593330.2018.1459870 | DOI Listing |
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