Adsorptive removal of azithromycin from aqueous solutions using raw and saponin-modified nano diatomite | Zendy

Siavash Davoodi | Zendy; Behnaz Dahrazma | Zendy; Nasser Goudarzi | Zendy; Hajar Ghasemian Gorji | Zendy

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Adsorptive removal of azithromycin from aqueous solutions using raw and saponin-modified nano diatomite

Author(s) -

Siavash Davoodi,

Behnaz Dahrazma,

Nasser Goudarzi,

Hajar Ghasemian Gorji

Publication year - 2019

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2019.337

Subject(s) - adsorption , aqueous solution , azithromycin , chemistry , nuclear chemistry , zeta potential , fourier transform infrared spectroscopy , scanning electron microscope , saponin , specific surface area , chromatography , materials science , chemical engineering , organic chemistry , nanotechnology , nanoparticle , composite material , biochemistry , medicine , alternative medicine , catalysis , pathology , engineering , antibiotics

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 m 2 /g, 14-fold higher than that for raw diatomite, and for M-ND it was 90.1 m 2 /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.

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