Synthesis and characterization of zinc oxide nanorods and its photocatalytic activities towards degradation of 2,4-D

Meenakshi, G.; Sivasamy, A.

doi:10.1016/j.ecoenv.2016.10.010

Cited by 27 publications

(11 citation statements)

References 41 publications

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“…The bandgap (Eg) of ZnO was found to be around 3.23 eV obtained by using tauc plot [ 65 ] as shown in Fig 4 (inset). Similar values of bandgap was also reported previously in literature [ 50 , 66 ]. The visible light absorption by ZnO nanostructures have been attributed due to the presence of native point defects in the crystal lattice of ZnO which reduce the energy required for exciton pair generation upon photo-excitation [ 67 , 68 ].…”

Section: Resultssupporting

confidence: 91%

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Efficient visible light photocatalysis of benzene, toluene, ethylbenzene and xylene (BTEX) in aqueous solutions using supported zinc oxide nanorods

et al. 2017

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Benzene, toluene, ethylbenzene and xylenes (BTEX) are some of the common environmental pollutants originating mainly from oil and gas industries, which are toxic to human as well as other living organisms in the ecosystem. Here we investigate photocatalytic degradation of BTEX under visible light irradiation using supported zinc oxide (ZnO) nanorods grown on glass substrates using a microwave assisted hydrothermal method. ZnO nanorods were characterized by electron microscopy, X-ray diffraction (XRD), specific surface area, UV/visible absorption and photoluminescence spectroscopy. Visible light photocatalytic degradation products of BTEX are studied for individual components using gas chromatograph/mass spectrometer (GC/MS). ZnO nanorods with significant amount of electronic defect states, due to the fast crystallization of the nanorods under microwave irradiation, exhibited efficient degradation of BTEX under visible light, degrading more than 80% of the individual BTEX components in 180 minutes. Effect of initial concentration of BTEX as individual components is also probed and the photocatalytic activity of the ZnO nanorods in different conditions is explored. Formation of intermediate byproducts such as phenol, benzyl alcohol, benzaldehyde and benzoic acid were confirmed by our HPLC analysis which could be due to the photocatalytic degradation of BTEX. Carbon dioxide was evaluated and showed an increasing pattern over time indicating the mineralization process confirming the conversion of toxic organic compounds into benign products.

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Section: Resultssupporting

confidence: 91%

“…Zinc oxide is applied as anticancer agents [ 45 , 46 ]. Zinc oxide is widely used for photocatalytic degradation of toxic contaminants in water [ 47 – 50 ]. It is also used as antibacterial activity and antifouling [ 51 , 52 ], gas sensing [ 49 , 53 ] and for flame transport approach [ 48 , 54 ].…”

Section: Introductionmentioning

confidence: 99%

Efficient visible light photocatalysis of benzene, toluene, ethylbenzene and xylene (BTEX) in aqueous solutions using supported zinc oxide nanorods

et al. 2017

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“…[13][14][15] They generate reactive oxygen species (ROS) as photocatalysts over wavelength ranges of band gap energies, and induce ROS-mediated toxicity and decomposition in microorganisms after UV treatment. 11,[14][15][16][17] UV irradiation has been studied as an alternative disinfection technique in purification systems, as well as clinics. [17][18][19] In the UV spectra, UV-C (100~280 nm) is generally used for disinfection, which is lethal in bacteria and inactivates viruses due to its damage to genetic materials by absorption at 250~270 nm as a peak germicidal wavelength.…”

Section: Introductionmentioning

confidence: 99%

“…4,5 Thus, the combination of UV and MO nanoparticles can be applied for a future disinfection system. [9][10][11] Adsorption function of MO nanoparticles to microorganisms can induce the disruption of bio-membranes and massive leakage of cell contents, due to their surface characteristics and physicochemical properties. 12 MO nanoparticles also have disinfection potential under UV irradiation, as well as in dark conditions.…”

Section: Introductionmentioning

confidence: 99%

“…8,28 MO nanoparticles generally have a highly crystalline structure, uniform particle shape, nanoscale size, and large surface area with mesopores for chemical and biological adsorption. 7,10 These properties were dependent on the synthesis techniques (e.g., sol-gel processing 11 and thermal evaporation 29 ) and the conditions which affect MO nanocrystal growth. 30 From the sharp peaks in PXRD patterns (Figure 2), ZnO nanoparticles showed a hexagonal Wurzite structure.…”

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confidence: 99%

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Dual UV irradiation-based metal oxide nanoparticles for enhanced antimicrobial activity in <em>Escherichia coli</em> and M13 bacteriophage

Jin¹,

Hwang²,

Lee³

et al. 2017

IJN

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Metal oxide (MO) nanoparticles have been studied as nano-antibiotics due to their antimicrobial activities even in antibiotic-resistant microorganisms. We hypothesized that a hybrid system of dual UV irradiation and MO nanoparticles would have enhanced antimicrobial activities compared with UV or MO nanoparticles alone. In this study, nanoparticles of ZnO, ZnTiO 3 , MgO, and CuO were selected as model nanoparticles. A dual UV collimated beam device of UV-A and UV-C was developed depending upon the lamp divided by coating. Physicochemical properties of MO nanoparticles were determined using powder X-ray diffractometry (PXRD), Brunauer-Emmett-Teller analysis, and field emission-scanning electron microscopy with energy-dispersive X-ray spectroscopy. Atomic force microscopy with an electrostatic force microscopy mode was used to confirm the surface topology and electrostatic characteristics after dual UV irradiation. For antimicrobial activity test, MO nanoparticles under dual UV irradiation were applied to Escherichia coli and M13 bacteriophage (phage). The UV-A and UV-C showed differential intensities in the coated and uncoated areas (UV-A, coated = uncoated; UV-C, coated ≪ uncoated). MO nanoparticles showed sharp peaks in PXRD patterns, matched to pure materials. Their primary particle sizes were less than 100 nm with irregular shapes, which had an 8.6~25.6 m 2 /g of specific surface area with mesopores of 22~262 nm. The electrostatic properties of MO nanoparticles were modulated after UV irradiation. ZnO, MgO, and CuO nanoparticles, except ZnTiO 3 nanoparticles, showed antibacterial effects on E. coli . Antimicrobial effects on E. coli and phages were also enhanced after cyclic exposure of dual UV and MO nanoparticle treatment using the uncoated area, except ZnO nanoparticles. Our results demonstrate that dual UV-MO nanoparticle hybrid system has a potential for disinfection. We anticipate that it can be developed as a next-generation disinfection system in pharmaceutical industries and water purification systems.

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Mechanism and influence factors of 2,4‐D dechlorination by sodium citrate‐activated bimetallic palladium‐zero valent iron nanoparticles

Zhou

Zhao

Xiang

et al. 2019

Applied Organom Chemis

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Nanoscale zero‐valent iron (nZVI) has high removal efficiency and strong reductive ability to organic contaminants, but this reactivity soon ceases and is attributed to rapid passivation of the nZVI surface due to the formation of iron oxides. In the present study, bimetallic palladium‐zero valent iron nanoparticles were activated with sodium citrate (SC‐nPd/Fe) to enhance 2,4‐D dechlorination from aqueous solutions. FTIR and XRD analyses showed that there was no passivation layer on the surface of nZVI after the addition of SC, and XPS analysis confirmed the nZVI after the reaction still maintained high reactivity and surface Pd ratio. The existence of SC facilitated the transfer of electrons from Fe0 to contaminants, thus accelerating the reductive dechlorination of 2,4‐D. The dechlorination efficiency of 2,4‐D on nPd/Fe was only 56.4% in 210 min, while complete dechlorination could be achieved on SC‐nPd/Fe under the same conditions, and simultaneously 97.1% of phenoxyacetic acid (PA) was generated. Moreover, the effect of reaction conditions on the dechlorination such as Pd ratio, SC dosage, initial pH and temperature was also investigated, and it was well described by pseudo‐first‐order kinetic model. In particular, The chelating abilities of SC is similar to EDTA, but it is an environmentally‐friendly chelating agent. Findings from the present study suggested that the SC could be a promising substitute for application in the remediation of 2,4‐D contained water.

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Synthesis and characterization of zinc oxide nanorods and its photocatalytic activities towards degradation of 2,4-D

Cited by 27 publications

References 41 publications

Efficient visible light photocatalysis of benzene, toluene, ethylbenzene and xylene (BTEX) in aqueous solutions using supported zinc oxide nanorods

Efficient visible light photocatalysis of benzene, toluene, ethylbenzene and xylene (BTEX) in aqueous solutions using supported zinc oxide nanorods

Dual UV irradiation-based metal oxide nanoparticles for enhanced antimicrobial activity in <em>Escherichia coli</em> and M13 bacteriophage

Mechanism and influence factors of 2,4‐D dechlorination by sodium citrate‐activated bimetallic palladium‐zero valent iron nanoparticles

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