Synthesis and characterization of bimetallic TiO2/CNT/Pd-Cu for efficient remediation of endocrine disruptors under solar light

Flor, María Patricia de la; Camarillo, Rafael; Martínez, Fabiola; Jiménez, Carlos; Quiles, Rafael; Rincón, Jesusa

doi:10.1016/j.jece.2022.107245

Cited by 25 publications

(14 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Precisely, this very special form prevents us from calculating the band gap energies of composites with the same graphical method described in reference [ 6 ], as happened in previous works [ 8 , 9 ]. For this reason, it is necessary to apply Tauc’s graphical procedure ( Figure S2 ) [ 15 ]. With it, values of band gap energies of about 2.10 eV and 2.40 eV were obtained for N/TiO 2 /CNT and N/TiO 2 /rGO, respectively, proving that the composites have higher visible light absorbance after N-doping and loading of N-TiO 2 [ 55 ].…”

Section: Resultsmentioning

confidence: 99%

“…Even more, the conductive structure of CNT and rGO scaffolds is believed to favor the separation of the photo-generated electron-hole pairs through the formation of heterojunctions (Scottky barrier) at the TiO 2 /CNT or TiO 2 /rGO interfaces [ 13 , 14 ]. Finally, from a morphologic point of view, the support of TiO 2 over CNT and rGO avoids particle agglomeration [ 15 ] and, thus, improves the homogeneous dispersion of this semiconductor and the availability of most active centers.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Photocatalytic Reduction of CO2 with N-Doped TiO2-Based Photocatalysts Obtained in One-Pot Supercritical Synthesis

et al. 2022

Self Cite

View full text Add to dashboard Cite

The objective of this work was to analyze the effect of carbon support on the activity and selectivity of N-doped TiO2 nanoparticles. Thus, N-doped TiO2 and two types of composites, N-doped TiO2/CNT and N-doped TiO2/rGO, were prepared by a new environmentally friendly one-pot method. CNT and rGO were used as supports, triethylamine and urea as N doping agents, and titanium (IV) tetraisopropoxide and ethanol as Ti precursor and hydrolysis agent, respectively. The as-prepared photocatalysts exhibited enhanced photocatalytic performance compared to TiO2 P25 commercial catalyst during the photoreduction of CO2 with water vapor. It was imputed to the synergistic effect of N doping (reduction of semiconductor band gap energy) and carbon support (enlarging e−-h+ recombination time). The activity and selectivity of catalysts varied depending on the investigated material. Thus, whereas N-doped TiO2 nanoparticles led to a gaseous mixture, where CH4 formed the majority compared to CO, N-doped TiO2/CNT and N-doped TiO2/rGO composites almost exclusively generated CO. Regarding the activity of the catalysts, the highest production rates of CO (8 µmol/gTiO2/h) and CH4 (4 µmol/gTiO2/h) were achieved with composite N1/TiO2/rGO and N1/TiO2 nanoparticles, respectively, where superscript represents the ratio mg N/g TiO2. These rates are four times and almost forty times higher than the CO and CH4 production rates observed with commercial TiO2 P25.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocatalytic Reduction of CO2 with N-Doped TiO2-Based Photocatalysts Obtained in One-Pot Supercritical Synthesis

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Figure 3 shows absorption spectra of synthesized pure CuO, Ce doped, W doped and bimetal Ce-W doped CuO nanoparticles recorded between 200-800nm range. As can been seen from the figure 3, doping of Ce results in blue shift in absorption peak which may be attributed to decrease in the crystallite size of nanoparticles [52]. In case of W doped CuO NPs, red shift was observed which is again due to increase in the crystallite size [53].…”

Section: Uv-vis Spectra Analysismentioning

confidence: 77%

Impact of bimetal doping on the structural and optical characteristics of copper oxide nanoparticles to enhance photocatalytic degradation of dyes: an investigative study

Abhilasha,

Kumari,

Gautam

2023

Phys. Scr.

View full text Add to dashboard Cite

Metal oxide nanoparticles have attracted a lot of attention for dye degradation applications as they have better light absorption properties required for the photocatalysis. This paper presents the impact of bi-metal doping (i.e. Cerium and Tungsten) on the structural and optical properties of Copper oxide nanoparticles. Bi-metal doping has shown remarkable impact on the optical properties (i.e. enhanced light absorption) of CuO nanoparticles making it suitable for photocatalytic applications. A simple co-precipitation method was used to synthesize the pure, single-metal doped and bi-metal doped (i.e. Ce, W and Ce-W) CuO nanoparticles. XRD analysis was done to study the structural properties along with crystallite size estimation using Debye-Scherer formula. Absorption band at 852 cm-1 and 650 cm-1 in the FT-IR spectra further confirmed the presence of CeO2 & WO2 in the monoclinic phase of CuO nanoparticles. Maximum absorption wavelength and bandgap are measured using UV-VIS Spectroscopy, and it has been observed that both these quantities depend upon the choice of dopant and can be tailored just by choosing the appropriate dopant. The paper presents an extensive analysis using experimental study to compare the impact of Ce, W and bimetal (Ce-W) doping on the structural, optical and photocatalytic properties of CuO nanoparticles. Enhanced optical absorption in the complete visible range is observed in case of bi-metal doped CuO nanoparticles making it a promising candidate for photocatalytic dye degradation application.

show abstract

“…For further insights into this observation, the oxygen spectra of the samples are also analyzed. The O 1s spectrum of bare-TiO 2 , as displayed in Figure (b), is found to be symmetric and shows two peaks at 529.8 eV that characterize the binding energy of the lattice oxygen (O L ) and a peak at 531.8 eV ascribed to the adsorbed oxygen . In contrast, the O 1s spectrum of Ag–Fe 3 O 4 @TiO 2 is found to be asymmetric.…”

Section: Resultsmentioning

confidence: 96%

Insights into the Photocatalytic Memory Effect of Magneto-Plasmonic Ag–Fe₃O₄@TiO₂ Ternary Nanocomposites for Dye Degradation and H₂ Production under Light and Dark Conditions

et al. 2022

View full text Add to dashboard Cite

This study explores the preparation of Ag plasmons-sensitized magnetic-Fe 3 O 4 integrated TiO 2 (Ag−Fe 3 O 4 @TiO 2 ) ternary nanocomposites and their defectinduced electron storage properties to exploit their photocatalytic memory effect toward dye degradation and H 2 generation under light and dark conditions. The crystalline phase formation and elemental states of the individual materials and elements in the nanocomposite are analyzed using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. The existence of Ti and Fe ions with dual oxidation states of Ti 4+/3+ and Fe 3+/2+ , respectively, is observed by XPS, which revealed the presence of defects in the system. The observed red shift along with a distinct plasmonic band (corresponding to metallic Ag nanoparticles) in the UV−visible absorption spectrum and the observed modified radiative recombination emission in the PL spectrum confirmed the plasmon-driven visible light activity along with the improved carrier separation and transfer characteristics in the synthesized ternary composite. Accordingly, the Ag− Fe 3 O 4 @TiO 2 photocatalyst degraded almost 100% of MB (methylene blue) and RhB (rhodamine B) dyes under simulated solar light in 90 min, while it is found to be around 42% and 36% in 60 min under dark conditions, respectively (which is preirradiated for 60 min). Further, it produced H 2 at the rate of 911 μmol g −1 h −1 under light conditions and is decreased to ∼96 μmol g −1 h −1 under dark conditions which is preirradiated for 1 h. However, when the composite is preirradiated for 3 h, it showed a maximum H 2 evolution of 144 μmol g −1 h −1 under dark. Further, the photocurrent and electrochemical impedance under light and dark conditions suggested the mechanism of photocatalytic charge storage and transfer process in the composite. Although the photocatalytic memory effect of the composite is meager toward H 2 production due to the insufficient potential of the stored−released electrons to reduce the protons (2H + ) to H 2 under dark conditions, their degradation efficiency is considerably good.

show abstract

Synthesis and characterization of bimetallic TiO2/CNT/Pd-Cu for efficient remediation of endocrine disruptors under solar light

Cited by 25 publications

References 55 publications

Photocatalytic Reduction of CO2 with N-Doped TiO2-Based Photocatalysts Obtained in One-Pot Supercritical Synthesis

Photocatalytic Reduction of CO2 with N-Doped TiO2-Based Photocatalysts Obtained in One-Pot Supercritical Synthesis

Impact of bimetal doping on the structural and optical characteristics of copper oxide nanoparticles to enhance photocatalytic degradation of dyes: an investigative study

Insights into the Photocatalytic Memory Effect of Magneto-Plasmonic Ag–Fe₃O₄@TiO₂ Ternary Nanocomposites for Dye Degradation and H₂ Production under Light and Dark Conditions

Contact Info

Product

Resources

About

Synthesis and characterization of bimetallic TiO2/CNT/Pd-Cu for efficient remediation of endocrine disruptors under solar light

Cited by 25 publications

References 55 publications

Photocatalytic Reduction of CO2 with N-Doped TiO2-Based Photocatalysts Obtained in One-Pot Supercritical Synthesis

Photocatalytic Reduction of CO2 with N-Doped TiO2-Based Photocatalysts Obtained in One-Pot Supercritical Synthesis

Impact of bimetal doping on the structural and optical characteristics of copper oxide nanoparticles to enhance photocatalytic degradation of dyes: an investigative study

Insights into the Photocatalytic Memory Effect of Magneto-Plasmonic Ag–Fe3O4@TiO2 Ternary Nanocomposites for Dye Degradation and H2 Production under Light and Dark Conditions

Contact Info

Product

Resources

About

Insights into the Photocatalytic Memory Effect of Magneto-Plasmonic Ag–Fe₃O₄@TiO₂ Ternary Nanocomposites for Dye Degradation and H₂ Production under Light and Dark Conditions