Removal of pharmaceutical pollutant cefixime from aqueous solutions using SBA-16 mesostructure modified with NH2 group and optimization of effective parameters by experiment design software

Soleymani, Samaneh; Razavimehr, Maryam; Saki, Fatemeh

doi:10.66437/JNS.2412.1005.1.1.5

Removal of pharmaceutical pollutant cefixime from aqueous solutions using SBA-16 mesostructure modified with NH2 group and optimization of effective parameters by experiment design software

Document Type : Original Article

Authors

Samaneh Soleymani ¹

Maryam Razavimehr ²

Fatemeh Saki ¹

¹ PhD in Chemistry, Physical Chemistry, Lorestan University, Khorramabad, Iran

² Department of Education, Faculty of Teacher Education, Farhangian University, Boroujerd, Iran

10.66437/JNS.2412.1005.1.1.5

Abstract

In this research, the mesostructure of SBA-16 was synthesized and its surface was modified by NH₂ group to increase efficiency. And then the prepared SBA-16-NH₂ was used as an adsorbent to remove the pharmaceutical pollutant cefixime from aqueous environments. The mesoporous structure of SBA-16-NH₂ was analyzed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Then, the effect of different parameters such as pH, initial concentration of cefixime, amount of SBA-16-NH₂ adsorbent, temperature and contact time on the absorption of medicinal pollutant cefixime by the prepared adsorbent was investigated with the help of experiment design software. The results of the predicted experiments showed that the highest absorption of cefixime is seen at pH=4, temperature 43℃, contact time 35 min., initial adsorbent concentration 10 ppm and adsorbent amount 0.049 g. In optimal conditions, SBA-16-NH₂ adsorbent could remove 98.88% of cefixime from aqueous medium. Also, Langmuir, Freundlich and Temkin isotherms were investigated and the results indicated that the adsorption behavior is mostmostly consistent with Langmuir isotherm. The results of thermodynamic experiments also indicated that the absorption process is exothermic and spontaneous

Keywords

Nanomesoporous SBA-16-NH2

Pharmaceutical pollutants

Antibiotic

Cefixime

Experimental design

Response surface method