LAUSR

The present study aims to improve the adsorption of tetracycline (TC) antibiotic onto dioxide silicon nanoparticles (SiO2 NPs) biosynthesized from the extract of Nerium oleander leaves. The SiO2 NPs were characterized using SEM-EDX, BET-BJH, FTIR-ATR, TEM, and XRD. TC adsorption on SiO2 NPs followed the pseudo 2nd order model and the Langmuir isotherm model with Qm was 552.48 mg g-1. The removal of TC using SiO2 NPs was 99.56% at conditions (SiO2 NPs amount = 0.25 g L-1, C0 = 25 mg L-1, and t = 40 min) based on design-optimization. Electrostatic interaction governs the adsorption mechanism is attributed. The reusability of SiO2 NPs was tested, and the performance adsorption was 85.36% after the five cycles. The synthesized SiO2 NPs as promising adsorbent has a potential application for antibiotics removal from wastewaters.