The role of lanthanum in improving the visible-light photocatalytic activity of TiO2 nanoparticles prepared by hydrothermal method

Han, Minglei; Dong, Zhiqiang; Liu, Jiaan; Ren, Guihua; Ling, Meiqi; Yang, Xiaodong; Zhang, Lianren; Xue, Bing; Li, Fangfei

doi:10.1007/s00339-020-04135-8

Cited by 9 publications

(8 citation statements)

References 44 publications

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“…In Figure 1 , the optimized surfaces (101) of TiO 2 and La/TiO 2 are shown comparatively. In this figure, the formation of La-O-Ti bonds on the TiO 2 surface can be observed, which supports the experimental results reported in the literature [ 56 , 59 , 60 , 61 ].…”

Section: Discussionsupporting

confidence: 91%

“…In addition to these advantages, one of the most important characteristics of TiO 2 doping with La 3+ is the reduction in the band gap, which optimizes the ability of the semiconductor to absorb wavelengths with less energy, reducing the recombination of vacant/electron pairs and modifying the adsorption capacity of this photocatalyst surface. Another advantage of doping TiO 2 with La 3+ is the decrease in photogenerated charge recombination as the photogenerated electrons migrate and are captured by the metal particles, which become active sites for oxygen reduction [ 56 ].…”

Section: Discussionmentioning

confidence: 99%

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La3+’s Effect on the Surface (101) of Anatase for Methylene Blue Dye Removal, a DFT Study

2022

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Density functional theory (DFT) is a widely used method for studying matter at the quantum level. In this study, the surface (101) of TiO2 (anatase phase) was considered to develop DFT calculations and explain the effect of lanthanum ion (La3+) on the electronic properties, adsorption capacity, and photocatalytic activity of this semiconductor. Due to the presence of the La3+ ion, the bandgap energy value of La/TiO2 (2.98 eV) was lower than that obtained for TiO2 (3.21 eV). TDOS analysis demonstrated the presence of hybrid levels in La/TiO2 composed mainly of O2p and La5d orbitals. The chemical nature of the La-O bond was estimated from PDOS analysis, Bader charge analysis, and ELF function, resulting in a polar covalent type, due to the combination of covalent and ionic bonds. In general, the adsorption of the methylene blue (MB) molecule on the surface (101) of La/TiO2 was energetically more favorable than on the surface (101) of TiO2. The thermodynamic stability of doping TiO2 with lanthanum was deduced from the negative heat-segmentation values obtained. The evidence from this theoretical study supports the experimental results reported in the literature and suggests that the semiconductor La/TiO2 is a potential catalyst for applications that require sunlight.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

La3+’s Effect on the Surface (101) of Anatase for Methylene Blue Dye Removal, a DFT Study

2022

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“…The samples were taken out every 30 min from the reactor during irradiation, and the absorbance spectra were recorded using UV-3101 PC-Shimadzu double-beam spectrophotometer. The degradation efficiency of MB can be evaluated employing the following equation [23] Degradation efficiency = (…”

Section: Estimation Of Photocatalytic Potential By the Degradation Of A Dyementioning

confidence: 99%

Influence of magnesium doping on microstructure, optical and photocatalytic activity of zinc oxide thin films synthesis by sol–gel route

et al. 2021

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The article deals with the effect of Mg dopant on the properties and the photocatalytic of ZnO films synthesized by the sol-gel technique onto glass substrates. It is found that Mg dopant has a strong influence on the microstructure and functional properties.The EDX analysis revealed that Mg had been incorporated into the ZnO. Structural studies through XRD have shown that the deposited films are of hexagonal structure with a preferential growth along the c-axis and nanometer crystal size. According to AFM analysis; it is found that the roughness of Mg-doped ZnO films increases with the Mg dopant. The film surface depicted wrinkles morphology as observed by ESEM. Optical investigations by spectrophotometry and photoluminescence revealed that as the Mg dopant is increased, the optical band-gap increases. Moreover, near band edge and visible emissions as probed by Photoluminescence can be manipulated by the Mg dopant, as their intensity increases and decreases, respectively. Finally, the photocatalytic activity for degradation of methylene blue is strongly improved all the more as the Mg content is increased.

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“…In the other mechanism, it is considered that there is not enough energy to promote ion substitution in the lattice, so the lanthanide elements can disperse on the TiO 2 surface, creating Ti–O–Ln bonds [ 25 ]. Presence of lanthanides, scattered as surface impurities in the TiO 2 structure, causes vacancies and surface defects that enable capture of the electrons produced on the surface of the photocatalyst, thus reducing recombination of photogenerated charge carriers [ 26 ]. However, an excess of lanthanide dopants on the TiO 2 surface can reduce its photocatalytic capacity, possibly due to generation of elevated density of defects and vacancies, which would behave as recombination centers and not as electron collectors [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Doping TiO2 NPs with Lanthanides (La, Ce and Eu) on the Adsorption and Photodegradation of Cyanide—A Comparative Study

Jaramillo-Fierro

León

2023

Nanomaterials

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Free cyanide is a highly dangerous compound for health and the environment, so treatment of cyanide-contaminated water is extremely important. In the present study, TiO2, La/TiO2, Ce/TiO2, and Eu/TiO2 nanoparticles were synthesized to assess their ability to remove free cyanide from aqueous solutions. Nanoparticles synthesized through the sol–gel method were characterized by X-ray powder diffractometry (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), Fourier-transformed infrared spectroscopy (FTIR), diffuse reflectance spectroscopy (DRS), and specific surface area (SSA). Langmuir and Freundlich isotherm models were utilized to fit the adsorption equilibrium experimental data, and pseudo-first-order, pseudo-second-order, and intraparticle diffusion models were used to fit the adsorption kinetics experimental data. Cyanide photodegradation and the effect of reactive oxygen species (ROS) on the photocatalytic process were investigated under simulated solar light. Finally, reuse of the nanoparticles in five consecutive treatment cycles was determined. The results showed that La/TiO2 has the highest percentage of cyanide removal (98%), followed by Ce/TiO2 (92%), Eu/TiO2 (90%), and TiO2 (88%). From these results, it is suggested that La, Ce, and Eu dopants can improve the properties of TiO2 as well as its ability to remove cyanide species from aqueous solutions.

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The role of lanthanum in improving the visible-light photocatalytic activity of TiO2 nanoparticles prepared by hydrothermal method

Cited by 9 publications

References 44 publications

La3+’s Effect on the Surface (101) of Anatase for Methylene Blue Dye Removal, a DFT Study

La3+’s Effect on the Surface (101) of Anatase for Methylene Blue Dye Removal, a DFT Study

Influence of magnesium doping on microstructure, optical and photocatalytic activity of zinc oxide thin films synthesis by sol–gel route

Effect of Doping TiO2 NPs with Lanthanides (La, Ce and Eu) on the Adsorption and Photodegradation of Cyanide—A Comparative Study

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