Synthesis, characteristics and Photocatalytic degradation of the metronidazole from aqueous solution by ZnO nanoparticles immobilized on a stone surface

سال انتشار: 1400
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 121

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شناسه ملی سند علمی:

NSCEI10_094

تاریخ نمایه سازی: 18 شهریور 1402

چکیده مقاله:

The presence of antibiotics such as metronidazole in wastewater even at low concentrations requires searching for a suitable process such as advanced oxidation process (AOP) to reduce the level of pollutants to a standard level in water. In this study, zinc oxide (ZnO) nanoparticles were synthesized by thermal method using zinc sulfate (ZnSO۴) as a precursor, then, stabilized on stone and was used as a catalyst, in order to degrade metronidazole by photocalytic process. Effective factors on the removal efficiency of metronidazole including the initial metronidazole concentration, contact time, pH, and ۰.۹ gL-۱ ZnO stabilized on the stone surface were investigated.The X-ray diffraction (XRD) studies showed that the synthesized nanomaterials have hexagonal Wurtzite structure. Also, scanning electron microscopy (SEM) analysis revealed that the average crystalline size of the synthesized ZnO particles was in the range of ۱.۹-۳.۲ nm. The spectra represented a sharp absorption edge at ۳۹۰ nm for ZnO nanoparticles corresponding to band gap of ۳.۱۶۸ eV. The maximum removal efficiency was ۹۸.۳۶% for the synthetic solution under a specific condition (pH = ۱۱, reaction time = ۹۰ minutes, ZnO concentration = ۰.۹ gL-۱, and the initial concentration of metronidazole = ۱۰ mgL-۱). The photocatalytic degradation was found to follow pseudo-first-order degradation kinetics. Therefore, the ZnO nanoparticles synthesized by thermal decomposition are suitable and effective photocatalytic materials for degradation of pharmaceutical contaminants.

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نویسندگان

Majid Amiri Gharaghani

Department of Environmental Health Engineering, Sirjan School of Medical Sciences, Sirjan, Iran

Amir Naser Alibeigi

Department of Environmental Health Engineering, Sirjan School of Medical Sciences, Sirjan, Iran