Photocatalytic removal of bentazon by copper doped zinc oxide nanorods: Reaction pathways and toxicity studies.

Journal of Environmental Management
Mitra GholamiMehdi Shirzad-Siboni

Abstract

In this study, bentazon herbicide was degraded photocatalytically by copper doped zinc oxide nanorods fabricated by using a facile co-precipitation method. The crystal structure, morphology, surface composition, functional groups on the surface and valence state of the nanorods were investigated by XRD, SEM-EDX, FTIR, and XPS material characterization techniques. Environmental parameters including solution pH, catalyst dose, bentazon concentration, purging gases, H2O2 content, organic compound type and reusability affecting the rate of photocatalytic degradation of bentazon were evaluated. Under the optimal conditions, [Bentazon]0 = 20 mg L-1, Cu-ZnO loading = 0.5 g L-1, H2O2 = 2 mM, pH = 7 and in the presence of oxygen gas, 100% of the herbicide was removed within 60 min. By raising bentazon concentration (10-50 mg L-1), kobs decreased to values between 0.14 and 0.006 min-1 and the calculated electrical energy per order (EEo) increased from 38.16 to 727.27 (kWh m-3), respectively. The degradation removal of the herbicide using the UV/Cu-ZnO method (98.28%) was higher than that of the UV/ZnO method (32.14%) process. Interestingly, the photocatalytic performances in the first and fifth reuse cycles during catalyst recyclability ...Continue Reading

References

May 1, 1975·Journal of Agricultural and Food Chemistry·G P Nilles, M J Zabik
Oct 13, 2006·Journal of Hazardous Materials·N DaneshvarF Hosseinzadeh
Dec 18, 2012·Environmental Technology·J K YangM Shirzad Siboni
Dec 15, 2019·Environmental Science and Pollution Research International·Kazem GodiniJae-Kyu Yang

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