Repository of Research and Investigative Information

Repository of Research and Investigative Information

Kurdistan University of Medical Sciences

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

(2021) Photocatalytic removal of bentazon by copper doped zinc oxide nanorods: Reaction pathways and toxicity studies. Journal of Environmental Management.

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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, Bentazon0 = 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 tests were found to be similar. Generally, the efficacy of the method in the decomposition of bentazon in drinking water (78.95%) and actual sewage (46.77%) declined because of the presence of other anions due to their role as a scavenger of photogenerated reactive species. Intermediate products in the photocatalytic degradation of bentazon identified by gas chromatography/mass spectrometry (GC/MS) analysis were 2-amino-N-isopropyl-benzamide, 2-amino-benzoic acid, N-isopropyl-2-nitro-benzamide, and acids such as pentenedioic acid, oxalic acid and propenoic acid. Furthermore, the main mechanism for the photocatalytic removal of bentazon was determined to be via attack by hydroxyl radicals (�OH). The results of toxicity in the photocatalytic removal of bentazon by D. magna showed LC50 and toxicity unit (TU) 48 h equal to 46.10 and 9.56 vol percent. © 2021 Elsevier Ltd

Item Type: Article
Keywords: acrylic acid; anion; bentazon; benzamide derivative; benzoic acid; copper; drinking water; hydrogen peroxide; hydroxyl radical; nanorod; nitrogen; oxalic acid; oxygen; zinc oxide; zinc oxide nanoparticle, catalysis; catalyst; chemical reaction; decomposition; degradation; drinking water; hydroxyl radical; inorganic compound; pollutant removal; toxicity, Article; crystal structure; Daphnia magna; decomposition; effluent toxicity; energy dispersive X ray spectroscopy; environmental parameters; Fourier transform infrared spectroscopy; isoelectric point; kinetics; mass fragmentography; nonhuman; pH; photocatalysis; photodegradation; reaction analysis; scanning electron microscopy; sewage; surface property; toxicity; ultraviolet radiation; waste component removal; waste water management; X ray diffraction; X ray photoemission spectroscopy, Daphnia magna
Journal or Publication Title: Journal of Environmental Management
Volume: 294
Publisher: Academic Press
Identification Number: https://doi.org/10.1016/j.jenvman.2021.112962
ISSN: 03014797
Depositing User: مسعود رسول آبادی
URI: http://eprints.muk.ac.ir/id/eprint/5205

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