Preparation of S–N co-doped CoFe2O4@rGO@TiO2 nanoparticles and their superior UV-Vis light photocatalytic activities

Wei, Fengyu; Wang, Hui; Wei, Ran; Liu, Tao; Liu, Xueting

doi:10.1039/c8ra10238d

Cited by 42 publications

(15 citation statements)

References 52 publications

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“…4(c), the calculated k app value was 2.141 min −1 , 2.417 min −1 , 2.065 min −1 , and 2.069 min −1 , for CoF, NiF, CuF, and ZnF, respectively. The kinetic rate of degradation for ferrite photocatalysts in this study was found significantly higher than those reported in the literature 32,33 . The parameters evaluated from the kinetic model, along with the linear regression value, have been displayed in Supplementary Table 3.…”

Section: Resultscontrasting

confidence: 84%

Photocatalytic Degradation of Organic Pollutants over MFe2O4 (M = Co, Ni, Cu, Zn) Nanoparticles at Neutral pH

Gupta

Ghaffari

Kim

et al. 2020

Sci Rep

154

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in this study, we report a surfactant-mediated synthesis of ferrites (Mfe 2 o 4 : M = co, ni, cu, Zn) using the co-precipitation-oxidation method. The band gap calculated from UV-Visible diffuse reflectance spectra were found in the range of 1.11-1.81 eV. These ferrite nanocatalysts were studied for the photocatalytic degradation of multiple organic dyes in a 32 W UV-C/H 2 o 2 system. All the four ferrites showed an excellent dye degradation rate in the range of 2.065-2.417 min −1 at neutral pH. in the optimized condition, NiF was found to degrade 89%, 92%, 93%, and 78% of methylene blue, methyl orange, bromo green, and methyl red, respectively within 1 min of UV-irradiation. A 40% TOC removal was recorded after 5 min of degradation reaction, which increased to 60% after 50 min. Mechanism elucidated by scavenger studies and fluorescence spectroscopy revealed that • oH and holes were the primary reactive radicals responsible for the degradation process. ferrite photocatalysts showed an insignificant performance loss in seven consecutive cycles. The photocatalyst was found efficient in the presence of a high concentration of salts. thus, it was concluded that these photocatalysts are highly suitable for the remediation of dye-contaminated wastewater. The ever-increasing population, coupled with rapid urbanization and industrialization, have deteriorated the quality of life. Excessive contamination of water bodies could be a severe threat to both human beings and other life forms. Organic dyes are considered as one of the major pollutants discharged into the environment by textile, printing, food, and leather industries 1. Though a large segment of these synthetic dyes is non-toxic or less toxic, their presence in water increases the oxygen demand, which in turn affects aquatic animals 2. Among the dyes consumed in industries, up to 70% belong to azo dye family (those with azo-functional group "-N = N-"). Azo dyes have genotoxic, mutagenic, and carcinogenic effects on living beings 3. Some of the azo dyes are known to be carcinogenic in the non-cleaved state, and for many of the azo dyes, their cleaved products such as benzidine are known to induce tumors 4. Conventional biological, chemical, and physical methods like adsorption 5,6 , chemical precipitation 7 , and microbial degradation 8 have been established for the remediation of dye-contaminated wastewater. The practical application of these processes suffers due to high operational cost, sludge production, or formation of secondary pollutants. For a complete or partial degradation of organic dyes (into non-toxic byproducts), degradation by adopting the photocatalytic process is one of the viable options. In recent years, advanced oxidation processes based on the generation of highly reactive hydroxyl radicals have gained momentum for the degradation of toxic organic pollutants 9. Though the Fenton process is easier to operate, it suffers badly due to a slow regeneration of Fe 2+ ions 10. Thus, the ultraviolet radiation or electrochemical method is generally cou...

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Section: Resultscontrasting

confidence: 84%

Photocatalytic Degradation of Organic Pollutants over MFe2O4 (M = Co, Ni, Cu, Zn) Nanoparticles at Neutral pH

Gupta

Ghaffari

Kim

et al. 2020

Sci Rep

154

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“…Moreover, the peak observed at 531.15 eV can be correlated with an oxygen vacancy, which plays a crucial role in the catalytic process as it acts as an electron trapping centre and also a substrate anchoring site. 16,35 Similar types of bands were observed for sulphur and boron-doped carbon-modied TiO 2 , with a slight shi in the peak position. For S-doped CT, the peaks located at binding energies of 530.21, 531.12 and 532.06 eV can be assigned to Ti-O, S-Ti-O and S-O bonds, respectively, indicating that some of the O atoms in TiO 2 have been replaced by S atoms.…”

Section: Chemical Composition (Xps) Analysissupporting

confidence: 67%

Bandgap engineering via boron and sulphur doped carbon modified anatase TiO₂: a visible light stimulated photocatalyst for photo-fixation of N₂ and TCH degradation

et al. 2020

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“…Given that the ZnO–rGO hybrid has the effect of completely degrading the dye in 40 minutes, it would appear to outperform other similar types of composite and hybrid catalysts. For example, S/N co‐doped CoFe 2 O 4 @rGO@TiO 2 NPs were able to photo‐catalytically degrade RhB in 120 min, while ZnO crystals combined with few‐layered graphene flakes reached 100 % RhB degradation in 55 min…”

Section: Resultsmentioning

confidence: 99%

Microwave‐Assisted Synthesis of ZnO–rGO Core–Shell Nanorod Hybrids with Photo‐ and Electro‐Catalytic Activity

Jana

Gregory

2020

Chemistry A European J

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The unique two-dimensional structure and surface chemistry of reduced graphene oxide (rGO) along with its high electrical conductivity can be exploitedt om odify the electrochemical properties of ZnO nanoparticles (NPs). ZnO-rGO nanohybrids can be engineered in as imple new twostep synthesis, which is both fast and energy-efficient. The resulting hybrid materials show excellent electrocatalytic and photocatalytic activity.T he structure and compositiono f the as-prepared bare ZnO nanorods (NRs) andt he ZnO-rGO hybrids have been extensively characterised and the optical properties subsequently studied by UV/Vis spectroscopy and photoluminescence (PL) spectroscopy (including decay life-time measurements). The photocatalytic degradation of Rhodamine B( RhB) dye is enhanced using the ZnO-rGO hybrids as compared to bare ZnO NRs. Furthermore, potentiometry comparing ZnO and ZnO-rGO electrodes reveals af eatureless capacitive backgroundf or an Ar-saturated solution whereas for an O 2 -saturated solution aw ell-definedr edox peak was observed using both electrodes. The change in reductionp otential and significant increasei nc urrent density demonstrates that the hybrid core-shell NRs possess remarkable electrocatalytic activityf or the oxygen reduction reaction (ORR) as compared to NRs of ZnO alone. Figure 6. (a) Photoluminescences pectra of ZnO NRs and ZnO-rGO NRs, (b) proposedb and diagram of ZnO-rGO hybrid NRs.

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Preparation of S–N co-doped CoFe₂O₄@rGO@TiO₂ nanoparticles and their superior UV-Vis light photocatalytic activities

Abstract: A magnetic recoverable S–N co-doped CoFe2O4@rGO@TiO2 (CFGT-S/N) nanocomposite was synthesized via a facile vapor-thermal method. CFGT-S/N is an excellent UV-Vis photocatalyst because of the synergetic effects of S, N co-doping, the introduction of CoFe2O4 and rGO.

Cited by 42 publications

References 52 publications

Photocatalytic Degradation of Organic Pollutants over MFe2O4 (M = Co, Ni, Cu, Zn) Nanoparticles at Neutral pH

Photocatalytic Degradation of Organic Pollutants over MFe2O4 (M = Co, Ni, Cu, Zn) Nanoparticles at Neutral pH

Bandgap engineering via boron and sulphur doped carbon modified anatase TiO₂: a visible light stimulated photocatalyst for photo-fixation of N₂ and TCH degradation

Microwave‐Assisted Synthesis of ZnO–rGO Core–Shell Nanorod Hybrids with Photo‐ and Electro‐Catalytic Activity

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Preparation of S–N co-doped CoFe2O4@rGO@TiO2 nanoparticles and their superior UV-Vis light photocatalytic activities

Abstract: A magnetic recoverable S–N co-doped CoFe2O4@rGO@TiO2 (CFGT-S/N) nanocomposite was synthesized via a facile vapor-thermal method. CFGT-S/N is an excellent UV-Vis photocatalyst because of the synergetic effects of S, N co-doping, the introduction of CoFe2O4 and rGO.

Cited by 42 publications

References 52 publications

Photocatalytic Degradation of Organic Pollutants over MFe2O4 (M = Co, Ni, Cu, Zn) Nanoparticles at Neutral pH

Photocatalytic Degradation of Organic Pollutants over MFe2O4 (M = Co, Ni, Cu, Zn) Nanoparticles at Neutral pH

Bandgap engineering via boron and sulphur doped carbon modified anatase TiO2: a visible light stimulated photocatalyst for photo-fixation of N2 and TCH degradation

Microwave‐Assisted Synthesis of ZnO–rGO Core–Shell Nanorod Hybrids with Photo‐ and Electro‐Catalytic Activity

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Preparation of S–N co-doped CoFe₂O₄@rGO@TiO₂ nanoparticles and their superior UV-Vis light photocatalytic activities

Bandgap engineering via boron and sulphur doped carbon modified anatase TiO₂: a visible light stimulated photocatalyst for photo-fixation of N₂ and TCH degradation