Visible-light-driven composite La2O3/TiO2 nanotube arrays: Synthesis and improved photocatalytic activity

Li, Huirong; Feng, Bo

doi:10.1016/j.mssp.2015.11.021

Cited by 28 publications

(4 citation statements)

References 44 publications

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“…The large diameter of the La ion is useful for enhancing the specific surface area (SSA) of TiO 2 , while the strong electron-withdrawing effect that this ion possesses [ 30 ] may contribute to the formation of Lewis acidic sites that provide stability to the semiconductor in an aqueous reaction medium [ 67 , 68 ]. The formation of these acidic sites on the TiO 2 surface allows the effective adsorption of organic contaminants [ 57 , 69 ], such as methylene blue (MB) dye [ 55 ].…”

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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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: 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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“…Evidence from the literature shows that doping semiconductor oxides with La and Ce can reduce crystal growth [ 44 ] and increase the specific surface area and concentration of surface hydroxyl (−OH) groups, as well as improve optical properties of these semiconductors due to the increased concentration of oxygen vacancies. Furthermore, they can enhance the chemical adsorption of organic substrates on the semiconductor surface, which also enhances their photocatalytic efficiency for various applications [ 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 ].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of the Effect of Doping ZnTiO3 with Rare Earths (La and Ce) on the Adsorption and Photodegradation of Cyanide in Aqueous Systems

Jaramillo-Fierro

Cuenca

Ramón

2023

IJMS

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Cyanide is a highly toxic compound that can pose serious health problems to both humans and aquatic organisms. Therefore, the present comparative study focuses on the removal of total cyanide from aqueous solutions by photocatalytic adsorption and degradation methods using ZnTiO3 (ZTO), La/ZnTiO3 (La/ZTO), and Ce/ZnTiO3 (Ce/ZTO). The nanoparticles were synthesized by the sol-gel method and characterized by X-ray powder diffractometry (XRD), Scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDS), Diffuse reflectance spectroscopy (DRS), and Specific surface area (SSA). The adsorption equilibrium data were fitted to the Langmuir and Freundlich isotherm models. Adsorption kinetics were also evaluated using the pseudo-first-order and pseudo-second-order models and the intraparticle diffusion model. Likewise, the photodegradation of cyanide under simulated sunlight was investigated and the reusability of the synthesized nanoparticles for cyanide removal in aqueous systems was determined. The results demonstrated the effectiveness of doping with lanthanum (La) and cerium (Ce) to improve the adsorbent and photocatalytic properties of ZTO. In general, La/ZTO showed the maximum percentage of total cyanide removal (99.0%) followed by Ce/ZTO (97.0%) and ZTO (93.6%). Finally, based on the evidence of this study, a mechanism for the removal of total cyanide from aqueous solutions using the synthesized nanoparticles was proposed.

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“…One of the effective modification strategies in increasing the quantum yield of TiO2 and pairs of electron-hole is a combination of semiconductors [9]. The formation of heterojunctions causes changes in the electronic band structure adjacent to the interface region [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Calcination Temperature on the Preparation of Mixed Oxide SnO2/CeO2/TiO2 to Increase the Photodegradation Activity of Methylene Blue under Visible Light

Husna

Suherman

Natsir

2023

KEM

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Mixed oxide of titanium dioxide was synthesized by adding SnO2 and CeO2 through a precipitation method for the degradation of methylene blue (MB) under visible light. The as-prepared was dried and calcined at various temperatures, i.e. 450-750 °C. The calcined products were characterized by XRD, DRUV, and FTIR. The effect of calcination temperature was studied on the photodegradation of MB under visible light. The photocatalytic activity showed that calcined photocatalytic at 650 °C shows the lowest bandgap energy and the highest photocatalytic activity in the decomposition of methylene blue under visible light.

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Visible-light-driven composite La2O3/TiO2 nanotube arrays: Synthesis and improved photocatalytic activity

Cited by 28 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

Comparative Study of the Effect of Doping ZnTiO3 with Rare Earths (La and Ce) on the Adsorption and Photodegradation of Cyanide in Aqueous Systems

Effect of Calcination Temperature on the Preparation of Mixed Oxide SnO<sub>2</sub>/CeO<sub>2</sub>/TiO<sub>2</sub> to Increase the Photodegradation Activity of Methylene Blue under Visible Light

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