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Adsorptive removal of azithromycin from aqueous solutions using raw and saponin-modified nano diatomite
- Source :
- Water Science and Technology. 80:939-949
- Publication Year :
- 2019
- Publisher :
- IWA Publishing, 2019.
-
Abstract
- This study aims to investigate the performance and mechanism of raw (R-ND) and saponin-modified nano diatomite (M-ND) in the removal of azithromycin from aqueous solutions. Adsorbent characterization was performed using X-ray fluorescence, Brunauer–Emmett–Teller (BET), scanning electron spectroscopy, dynamic light scattering and energy-dispersive X-ray analyses. It was shown that the specific surface area of R-ND was 119.5 m2/g, 14-fold higher than that for raw diatomite, and for M-ND it was 90.1 m2/g. Various adsorption conditions, i.e. adsorbent dosage, pH, initial concentration and contact time were investigated. According to the results, despite reducing the specific surface area by 25%, modification of nano diatomite by saponin markedly enhanced its performance in the removal of azithromycin. The maximum adsorption capacity of R-ND and M-ND in the removal of azithromycin was 68 and 91.7 mg/g, respectively. Fourier transform infrared spectroscopy results revealed that azithromycin was adsorbed by O-H groups on the diatomite surface. Weber–Morris intra-particle diffusion (IPD) model suggested that while IPD is not the rate-controlling step in high concentrations of azithromycin, it is the only step that controls the rate of adsorption in low concentrations. In comparison to R-ND, M-ND showed a higher efficiency in the removal of azithromycin and, therefore, it can be used as a promising low-cost adsorbent to remove azithromycin from aqueous solutions.
- Subjects :
- Environmental Engineering
Scanning electron microscope
Diffusion
02 engineering and technology
Azithromycin
010501 environmental sciences
01 natural sciences
Adsorption
Dynamic light scattering
Specific surface area
Spectroscopy, Fourier Transform Infrared
Nano
Fourier transform infrared spectroscopy
0105 earth and related environmental sciences
Water Science and Technology
Aqueous solution
Chemistry
Hydrogen-Ion Concentration
Saponins
021001 nanoscience & nanotechnology
Diatomaceous Earth
Solutions
Kinetics
0210 nano-technology
Water Pollutants, Chemical
Nuclear chemistry
Subjects
Details
- ISSN :
- 19969732 and 02731223
- Volume :
- 80
- Database :
- OpenAIRE
- Journal :
- Water Science and Technology
- Accession number :
- edsair.doi.dedup.....a02a42e2ffcef49bb8ff9fa132d70a64
- Full Text :
- https://doi.org/10.2166/wst.2019.337