NGHIÊN CỨU XỬ LÝ Cu2+ TRONG MÔI TRƯỜNG NƯỚC BẰNG PHƯƠNG PHÁP HẤP PHỤ SỬ DỤNG VẬT LIỆU NANOSILICA VỎ TRẤU

Tóm tắt

In this study, we investigated adsorptive removal of copper ion Cu2+ in water environment using nanosilica
fabricated from rice husk. The nanosilica was characterized by X-ray diffraction (XRD), and energydispersive X-ray spectroscopy (EDX). Some parameters for removal of Cu2+ using nanosilica through
adsorption technique were adsorption time 90 min, pH 7 and adsorbent dosage 10 mg/mL. Under optimum
conditions, maximum removal of Cu2+ reached to 98.7 %. Adsortion capacity of Cu2+on nanosilica
decreased with increasing ionic strength while adsorption capacity reached to 50.0 mg/g. Adsorption of
Cu2+ on nanosilica in the presence of antibiotic ciprofloxacin (CFX) was higher than that in the absence
of CFX. Adsorption isotherms were well fitted by Freundlich model, suggesting that adsorption induced by
both electrostatic and non-electrostatic interactions.