Simultaneous catalytic ozonation degradation of metronidazole and removal of heavy metal from aqueous solution using nano-magnesium hydroxide
2021
Sun, Qi | Zhu, Guangcan | Wu, Jun | Lu, Jian | Zhang, Zhenhua
Simultaneous removal of the antibiotics and heavy metals has attracted increasing attention since these contaminants are frequently detected in the aquatic environment. In this study, highly active nano-Mg(OH)₂ was synthesized and firstly applied in catalytic ozonation system for simultaneous removal of metronidazole (MNZ) and heavy metal ions (Cu²⁺ and Zn²⁺). The results showed that the synthesized Mg(OH)₂ nanoparticles exhibited high efficiencies of removing both MNZ and heavy metal ions (Cu²⁺ and Zn²⁺) in the catalytic ozonation process. Surprisingly, the removal efficiency of MNZ in the catalytic ozonation system with nano-Mg(OH)₂ catalyst was improved in the presence of Cu²⁺ and Zn²⁺. Some parameters such as catalyst dosage, initial concentration of MNZ, initial concentration of heavy metal and reaction temperature could affect the simultaneous removal of MNZ and heavy metal ions (Cu²⁺ and Zn²⁺). This study provides an innovative and effective method for the simultaneous removal of antibiotics and heavy metals from the aquatic environment.
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