NÂNG CAO HIỆU QUẢ XỬ LÝ KHÁNG SINH CIPROFLOXACIN TRONG MÔI TRƯỜNG NƯỚC CỦA CÁC VẬT LIỆU HYDROTALCITE BIẾN TÍNH BẰNG ION Co2+

Tóm tắt

Hydrotalcite materials Mg0.667Al0.333(OH)2(CO3)0.167.0.5H2O modified by different amounts of Co2+ ions were
synthesized by the co-precipitation method at pH = 9.5. Characteristics of the materials showed that all six
synthetic material samples had a double layered structure similar to hydrotalcite. BET specific surface
increased slightly from 5.03 to 12.03 and 12.85 m2
/g when increasing the molar ratio of Co2+ in the MgAlH,
1.5CoMgH, 3.0CoMgH samples. The band gap energy (Eg) decreased from 3.64 eV to 1.99 eV when
increasing the ratio of Co2+ in the material samples from 0 - 3.0. All synthesized material samples exhibited
good adsorption capacity of ciprofloxacin (CIP) at pH = 10,0 with qmax = 158.7 mg/g according to
Langmuir model. The highest adsorption efficiency for a CIP solution with an initial concentration of 25
ppm was about 80% on sample 1.5CoMgH. The photocatalytic and adsorption activities of hydrotalcite
material samples modified with Co2+ ions were consistent with the results of structural characteristics,
especially UV-Vis DRS spectra. General performance for both adsorption and absorption processes
reached 67 - 80% after 240 minutes of adsorption and illumination at an initial pH of 6.5.