Oxidative degradation of the antibiotic oxytetracycline by Cu@Fe3O4 core-shell nanoparticles

Pham, Van Luan; Kim, Do-Gun; Ko, Seok‐Oh

doi:10.1016/j.scitotenv.2018.03.067

Cited by 59 publications

(19 citation statements)

References 56 publications

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“…This is due to the scavenger effects of H2O2, which are illustrated by Eq. ( 9) and ( 10) [16]. On the other hand, the addition of H2O2 also acts as an electron trap and is able to suppress the e -/h + recombination [73], as can be described in Eq.…”

Section: Optimisation Of H2o2 Concentrationmentioning

confidence: 99%

“…Nowadays, the core-shell nanostructure have great potential in catalysis because of their unique chemical and physical characteristics and have many advantages such as an increased number of surface-active sites for the core and promotion by the shell of catalytic activity [13,14]. Moreover, the reactions of all catalysts occur at the same time and the strength of the shell can protect the core and prevent assemblage of the particles [15,16]. In this context, many researchers have used various core shell nanostructures [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

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Superior performance of FeVO4@CeO2 uniform core-shell nanostructures in heterogeneous Fenton-sonophotocatalytic degradation of 4-nitrophenol

Eshaq

Wang

Sun

et al. 2020

Journal of Hazardous Materials

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Porous FeVO4 nanorods decorated on CeO2 nanocubes (FeVO4@CeO2) were successfully prepared via a facile hydrothermal route and tested in the degradation of 4-nitrophenol (4-NP) for enhanced heterogeneous oxidation using ultrasonic (US), ultraviolet (UV), and binary irradiation US/UV, respectively. The nanostructure of the core-shell FeVO4@CeO2 was characterised using XRD, SEM, EDS elemental mapping, TEM, HRTEM, SAED, FTIR, Raman, BET, point of zero charge (PZC), XPS analysis and UV-vis DRS. The effect of various parameters, for examples, nanostructured core-shell amounts, hydrogen peroxide concentration, initial concentration, pH and irradiation time, on 4-NP degradation were investigated for the optimisation of the catalytic performance. The durability and stability of the core-shell nanostructured materials were also investigated and the obtained results revealed that the catalysts can endure the harsh sonophotocatalytic conditions even after six cycles. Mineralisation experiments were investigated using the optimised parameters. The core-shell nanostructured FeVO4@CeO2 h a s h i g h e r P Z C t h a n p u r e F e V O 4 and CeO2, leading to excellent sonophotocatalytic activity even at high pH and stability for the degradation of 4-NP after six cycles. A possible mechanism over the FeVO4@CeO2 was proposed based on the special three-way Fenton-like mechanism and the dissociation of H2O2 with the experiments of active species trapping and calculated band gap energy.

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Section: Optimisation Of H2o2 Concentrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Superior performance of FeVO4@CeO2 uniform core-shell nanostructures in heterogeneous Fenton-sonophotocatalytic degradation of 4-nitrophenol

Eshaq

Wang

Sun

et al. 2020

Journal of Hazardous Materials

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“…The degradation efficiency is enhanced by increasing the amount of catalyst up to 0.3 g L 1 , and then any further increase in catalyst amount reduces the degradation capability of the system. As the catalyst amount increases, the number of the active sites increases, which enhances the rate of cavitation bubble generation and greater H2O2 decomposition to produce a huge number of • OH [81,82]. However, the degradation efficiency decreases upon increasing the catalyst amount, due to the scattering of ultrasound irradiation and the blocking of the transmission of ultrasound waves and energy near the catalyst surface, which in turn decreases degradation efficiency [83].…”

Section: Influence Of Catalyst Amountmentioning

confidence: 99%

Core/shell FeVO4@BiOCl heterojunction as a durable heterogeneous Fenton catalyst for the efficient sonophotocatalytic degradation of p-nitrophenol

Eshaq

Wang

Sun

et al. 2020

Separation and Purification Technology

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In this study, a FeVO4@BiOCl p-n heterojunction with n-type porous FeVO4 nanorods as the core and p-type flower-like BiOCl nanostructures as the shell was successfully prepared by a facile hydrothermal method. The novel heterostructure was investigated as a durable heterogeneous Fenton catalyst for ultrasonic irradiation (US), ultraviolet irradiation (UV) and coupling irradiation systems (US/UV). Characterization of FeVO4@BiOCl core shell heterojunction was conducted by XRD, SEM, EDS elemental mapping, TEM, HRTEM, SAED, FTIR, Raman, BET, PZC, XPS and DRS. Several different experimental parameters, including irradiation time, H2O2 concentration, catalyst amount, initial concentration, and pH value, were optimized. The stability and reusability of the prepared FeVO4@BiOCl core shell heterojunction were evaluated as well. Mineralization experiments were carried out using the optimized parameters. The results showed that FeVO4@BiOCl core shell heterojunction exhibits a superior sonophotocatalytic performance compared to either sonocatalysis or photocatalysis. Moreover, the formation of p-n core@shell nanostructures could significantly increase the pHpzc, and to an excellent stability for the degradation of PNP after six cycles. The remarkable enhancement of the degradation performance of FeVO4@BiOCl core shell heterojunction can be attributed to the unique structure and morphology with a matched energy band structure owing to the internal electric field induced by the p-n junction, a high transfer efficiency and the efficient separation of e -/h + pairs, resulting in a huge number of reactive species for the degradation of PNP. A plausible mechanism over FeVO4@BiOCl core shell heterojunction for the sonophotocatalytic degradation of PNP is proposed based on a special three-way, i.e. one as a photocatalyst and a two-way Fenton-like mechanism with the dissociation of H2O2. Active species trapping and calculated band gap energy were also discussed.

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“…On the other hand, the degradation rate of BTA decreased when the amount of H 2 O 2 increased to 15 µL and 20 µL. This is explained with that the overdose of H 2 O 2 suppresses the enhancement of the photocatalytic activity [58]. In addition, the effect of pH on BTA degradation is depicted in Fig.…”

Section: Photocatalytic Activitymentioning

confidence: 88%

Synthesis of novel α-Fe2O3-Bi2S3-Gr for efficient photocatalytic degradation of environmental pollutants under visible-LED light irradiation

Frindy

2022

Separation and Purification Technology

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nanorods was successfully synthesized via a hydrothermal route with incorporation of graphene obtained from the pyrolysis of alginate, and was employed as a catalyst of the degradation of benzotriazole (BTA) in a photo-Fenton process. Due to the unique combination of graphene and the binary α-Fe 2 O 3 -Bi 2 S 3 nanorod, the sample with 3 wt% graphene loading shows a high catalytic activity of 98% of BTA conversion under LED-visible light. The quenched free radicals are detected with an Electron Spin Resonance (ESR) technique, and the results indicate that hydroxyl radical • OH contributed to the BTA degradation reaction. A mechanism is proposed. Furthermore, the reusability of the catalyst was examined and the catalyst showed high activity over four cyclic runs.

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Oxidative degradation of the antibiotic oxytetracycline by Cu@Fe3O4 core-shell nanoparticles

Cited by 59 publications

References 56 publications

Superior performance of FeVO4@CeO2 uniform core-shell nanostructures in heterogeneous Fenton-sonophotocatalytic degradation of 4-nitrophenol

Superior performance of FeVO4@CeO2 uniform core-shell nanostructures in heterogeneous Fenton-sonophotocatalytic degradation of 4-nitrophenol

Core/shell FeVO4@BiOCl heterojunction as a durable heterogeneous Fenton catalyst for the efficient sonophotocatalytic degradation of p-nitrophenol

Synthesis of novel α-Fe2O3-Bi2S3-Gr for efficient photocatalytic degradation of environmental pollutants under visible-LED light irradiation

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