Enhanced photocatalytic degradation of tetracycline from aqueous solution by a novel magnetically separable FeNi3/SiO2/ZnO nano-composite under simulated sunlight: Efficiency, stability, and kinetic studies

Nasseh, Negin; Panahi, Ayat Hossein; Esmati, Marzie; Dağlioğlu, Nebīle; Asadi, Anvar; Rajati, Hajar; Khodadoost, Faranak

doi:10.1016/j.molliq.2019.112434

Cited by 64 publications

(16 citation statements)

References 52 publications

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“…Close to 100% degradation was reported. Similar composites with zinc oxide (ZnO) in the outermost shell as opposed to titanium dioxide (average size, 39 nm) was reported both by Khodadoost et al [127] and Panahi et al [128] who both demonstrated the ability to photocatalytically degrade organic contaminants, namely the antibiotic tetracycline and the anticancer drug tamoxifen both with 100% efficiency under simulated sunlight. FeNi 3 @SiO 2 composites, (size range, 45-50 nm), which do not possess a third outer shell were reported by Mahvi et al [128] and Allahresani et al [129] who used the composites for the Fenton style catalytic degradation of tetracycline (87% removal) and metronidazole (84% removal), respectively.…”

Section: Metallic/metal Oxide/magnetic Nanoparticle-based Nanocompositessupporting

confidence: 57%

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Govan

2020

Magnetochemistry

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Water resources are of extreme importance for both human society and the environment. However, human activity has increasingly resulted in the contamination of these resources with a wide range of materials that can prevent their use. Nanomaterials provide a possible means to reduce this contamination, but their removal from water after use may be difficult. The addition of a magnetic character to nanomaterials makes their retrieval after use much easier. The following review comprises a short survey of the most recent reports in this field. It comprises five sections, an introduction into the theme, reports on single magnetic nanoparticles, magnetic nanocomposites containing two of more nanomaterials, magnetic nanocomposites containing material of a biologic origin and finally, observations about the reported research with a view to future developments. This review should provide a snapshot of developments in what is a vibrant and fast-moving area of research.

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Section: Metallic/metal Oxide/magnetic Nanoparticle-based Nanocompositessupporting

confidence: 57%

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Govan

2020

Magnetochemistry

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“…However, at pH 9, an opposite trend was observed. At alkaline pH, negatively charged TC species tend to attract reactive groups such as ● OH due to their high electronic density on the ring system, which would result in the enhancement of removal efficiency of TC [ 33 , 34 ]. However, the degradation rate of TC is inhibited when the pH > 10, since the ● OH will compete with TC to be adsorbed on the photocatalyst surface [ 35 , 36 , 37 ].…”

Section: Resultsmentioning

confidence: 99%

Floating ZnO QDs-Modified TiO2/LLDPE Hybrid Polymer Film for the Effective Photodegradation of Tetracycline under Fluorescent Light Irradiation: Synthesis and Characterisation

et al. 2021

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In this work, mesoporous TiO2-modified ZnO quantum dots (QDs) were immobilised on a linear low-density polyethylene (LLDPE) polymer using a solution casting method for the photodegradation of tetracycline (TC) antibiotics under fluorescent light irradiation. Various spectroscopic and microscopic techniques were used to investigate the physicochemical properties of the floating hybrid polymer film catalyst (8%-ZT@LLDPE). The highest removal (89.5%) of TC (40 mg/L) was achieved within 90 min at pH 9 due to enhanced water uptake by the LDDPE film and the surface roughness of the hybrid film. The formation of heterojunctions increased the separation of photogenerated electron-hole pairs. The QDs size-dependent quantum confinement effect leads to the displacement of the conduction band potential of ZnO QDs to more negative energy values than TiO2. The displacement generates more reactive species with higher oxidation ability. The highly stable film photocatalyst can be separated easily and can be repeatedly used up to 8 cycles without significant loss in the photocatalytic ability. The scavenging test indicates that the main species responsible for the photodegradation was O2●−. The proposed photodegradation mechanism of TC was demonstrated in further detail based on the intermediates detected by LC-time-of-flight/mass spectrometry (LC/TOF-MS).

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“…At pH values below 4, TC exists mainly in its protonated form, whereas TZQ adopts a surface charge at Ph ~4 at pH conditions below the point-of-zero-charge (PZC = 6.9), and TC is adsorbed to a lesser extent due to the role of repulsive interactions. In turn, the positive surface charge on TZQ results in a lower TC removal [45,46]. The TC removal at pH 3 was 56.1%.…”

Section: The Effect Of the Initial Ph Of The Solutionmentioning

confidence: 98%

“…The photodegradation of TC was found to adhere to the pseudo-first-order kinetic model (cf. Table 4) [45,46]. The order of photocatalytic degradation efficiency of TC adopts the following order: TZQ (20.52 × 10 −3 min −1 ) > ZnO QDs (11.24 × 10 −3 min −1 ) > meso-TiO 2 (6.91 × 10 −3 min −1 ) > P25 (3.21 × 10 −3 min −1 ), where the bracketed values represent the pseudo-first-order rate constant (k).…”

Section: Photocatalytic Activity 221 the Effect Of Different Types Of Photocatalystmentioning

confidence: 99%

Mesoporous TiO2 Implanted ZnO QDs for the Photodegradation of Tetracycline: Material Design, Structural Characterization and Photodegradation Mechanism

et al. 2021

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A sol-gel method was used to prepare a mesoporous TiO2 implanted with a ZnO quantum dot photocatalyst (TZQ) for the photodegradation of tetracycline (TC) under fluorescent light irradiation. Scanning electron microscopy (SEM) shows the presence of cavities on the photocatalyst surface due to the use of starch as a synthetic template, where the nitrogen sorption results indicate that TZQ contains mesopores with reduced size (ca. 4.3 nm) versus the pore size of the parent meso-TiO2 (ca. 7.5 nm). The addition of ZnO quantum dots (QDs) resulted in spherically-shaped binary composite particles in layers onto the surface of TiO2. The coexistence of the ZnO QDs and TiO2 phase was observed using high resolution-transmission electron microscopy (HR-TEM). The photodegradation of TC was carried out in a homemade reactor equipped with two fluorescent lights (24 W each) and within 90 min of irradiation, 94.6% of TC (40 mg L−1) was photodegraded using 250 mg L−1 of TZQ at pH 9. The major reactive oxygen species identified from the scavenging tests were O2●− followed by HO●. The deconvolution of the photoluminescence spectrum of TZQ indicates the presence of a strong quantum confinement effect (QCE) of the ZnO QDs, a defect related to Ti-species and oxygen. The analysis of the intermediates detected by LC-time-of-flight/mass spectrometry (LC/TOF-MS) suggest two photodegradation pathways. The pathways were validated using the Fukui function approach and the Wheland localisation approach. This simple and efficient photocatalytic technology is anticipated to benefit small-scale animal husbandries and aquaculture operators that have limited access to sustainable water treatment technology.

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Enhanced photocatalytic degradation of tetracycline from aqueous solution by a novel magnetically separable FeNi3/SiO2/ZnO nano-composite under simulated sunlight: Efficiency, stability, and kinetic studies

Cited by 64 publications

References 52 publications

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Floating ZnO QDs-Modified TiO2/LLDPE Hybrid Polymer Film for the Effective Photodegradation of Tetracycline under Fluorescent Light Irradiation: Synthesis and Characterisation

Mesoporous TiO2 Implanted ZnO QDs for the Photodegradation of Tetracycline: Material Design, Structural Characterization and Photodegradation Mechanism

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