Tailoring the room temperature ferromagnetism in TiO2 nanoparticles by modulating the concentration of surface oxygen vacancy via La incorporating

Zhang, Hong; Wang, Yuzhu; Zhong, Weijie; Long, Bo; Wu, Yibing; Xie, Zhi

doi:10.1016/j.ceramint.2019.03.222

Cited by 15 publications

(4 citation statements)

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“…And the spin orbit splitting energy between the two peaks of Bi 4f 7/2 and Bi 4f 5/2 is 5.3 eV, indicating the presence of Bi 3+ in four different crystalline phases of Bi 2 O 3 catalysts (α-, β-, δ-, γ-). 39 Moreover, as displayed in Figure 5 40 Interestingly, the sequence of the molar ratios of O sur /(O latt +O sur ) is also consistent with that of their corresponding thermocatalytic performances, as shown in Table 1. The result could be closely related to the fact that surface oxygen vacancies in the metal oxides are favorable to both adsorption and thermal activation of CO 2 through receiving lone pair electrons of carbonyl oxygen in CO 2 .…”

Section: Industrial and Engineering Chemistry Researchsupporting

confidence: 80%

“…The molar ratios of O sur /(O latt +O sur ) for four different Bi 2 O 3 catalysts (α-, β-, δ-, and γ-) involved in this work were calculated and summarized in Table . This result demonstrates that there is a sequence of α-Bi 2 O 3 (61.49%) > β-Bi 2 O 3 (59.33%) > δ-Bi 2 O 3 (51.92%) > γ-Bi 2 O 3 (50.75%) for the molar ratios of O sur /(O latt +O sur ), indicating that α-Bi 2 O 3 has the highest surface oxygen vacancy, since the molar ratio of O sur /(O latt +O sur ) can serve as a semiquantitative method to estimate the concentration of surface oxygen vacancy . Interestingly, the sequence of the molar ratios of O sur /(O latt +O sur ) is also consistent with that of their corresponding thermocatalytic performances, as shown in Table .…”

Section: Origin Of the Difference In Catalytic Activitymentioning

confidence: 83%

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Photothermal Cocatalytic Carbonylation of Isobutyl Amine with CO₂ over Bi₂O₃ Polymorphs under Visible-Light Irradiation

Sun

Yang

Cai

et al. 2023

Ind. Eng. Chem. Res.

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Effective capture and utilization of CO2 is critical to reduce greenhouse gas emissions and to reach the low-carbon economy target. Herein, bismuth oxides with four different crystallized phases (α-, β-, δ-, γ-) are successfully synthesized and employed for the first time as photo, thermal, and photothermal catalysts for the successful catalytic carbonylation of isobutyl amine with CO2 to N,N′-diisobutylurea. The results displayed that the photothermal catalytic performances of Bi2O3 polymorphs followed the order of α-Bi2O3 > δ-Bi2O3 > γ-Bi2O3 > β-Bi2O3, in which the conversion of i-BuNH2 and the selectivity of N,N′-diisobutylurea for α-Bi2O3 was 50.38% and 91.79%, respectively, using N-methyl-2-pirrolidinone (NMP) as solvent and 500 W Xe lamp as the light source under the conditions of 1.0 MPa CO2 (initial pressure at room temperature) and 4 h reaction time at 100 °C. Further characterization of Bi2O3 polymorphs including XRD, SEM, BET, XPS, EPR, TPC, PL, and UV–vis absorption spectra reveals that such differences in the photothermal catalytic activity of Bi2O3 could be closely related to the efficiencies of photoinduced carriers separation. And the surface oxygen vacancies rather than bulk oxygen vacancies are favorable for the improvement of their both thermal and photothermal catalytic performances in the carbonylation of i-BuNH2 with CO2.

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Section: Industrial and Engineering Chemistry Researchsupporting

confidence: 80%

Section: Origin Of the Difference In Catalytic Activitymentioning

confidence: 83%

Photothermal Cocatalytic Carbonylation of Isobutyl Amine with CO₂ over Bi₂O₃ Polymorphs under Visible-Light Irradiation

Sun

Yang

Cai

et al. 2023

Ind. Eng. Chem. Res.

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“…Photocatalyst-coated surface-based reactors have proven to be more practical for long-term operation than photocatalytic powder-based reactors [ 11 , 12 , 13 , 14 ]. As a promising photo-electrode and photocatalyst, titanium dioxide (TiO 2 ) has enjoyed wider applicability in photocatalytic hydrogen generation, solar cells, and the remediation of organic contaminants among other photo-catalytic applications [ 15 , 16 , 17 ]. Furthermore, TiO 2 is recognized as a low-cost, highly effective and photo-catalyst of interest as a result of its promising thermal and chemical stabilities, desirable electronic features, and environmental benignity, among others [ 18 , 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Violet-Assisted Scalable Method to Fabricate Oxygen-Vacancy-Rich Titanium-Dioxide Semiconductor Film for Water Decontamination under Natural Sunlight Irradiation

Alyami

2023

Nanomaterials

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This work reports the fabrication of titanium dioxide (TiO2) nanoparticle (NPs) films using a scalable drop-casting method followed by ultra-violet (UV) irradiation for creating defective oxygen vacancies on the surface of a fabricated TiO2 semiconductor film using an UV lamp with a wavelength oof 255 nm for 3 h. The success of the use of the proposed scalable strategy to fabricate oxygen-vacancy-rich TiO2 films was assessed through UV–Vis spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The Ti 2p XPS spectra acquired from the UV-treated sample showed the presence of additional Ti3+ ions compared with the untreated sample, which contained only Ti4+ ions. The band gap of the untreated TiO2 film was reduced from 3.2 to 2.95 eV after UV exposure due to the created oxygen vacancies, as evident from the presence of Ti3+ ions. Radiation exposure has no significant influence on sample morphology and peak pattern, as revealed by the SEM and XRD analyses, respectively. Furthermore, the photocatalytic activity of the fabricated TiO2 films for methylene-blue-dye removal was found to be 99% for the UV-treated TiO2 films and compared with untreated TiO2 film, which demonstrated only 77% at the same operating conditions under natural-sunlight irradiation. The proposed UV-radiation method of oxygen vacancy has the potential to promote the wider application of photo-catalytic TiO2 semiconductor films under visible-light irradiation for solving many environmental and energy-crisis challenges for many industrial and technological applications.

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“…The larger the crystallite size, the more is the saturation magnetization. Zhang et al 21 conducted a study in which La ions were introduced into TiO 2 NPs without disturbing the tetragonal structure of the anatase phase. The addition of La ions modulates the concentration of oxygen vacancy in the sample which further modulates the room temperature magnetism in the NPs.…”

Section: Introductionmentioning

confidence: 99%

Synthesizing and Optimizing Rutile TiO2 Nanoparticles for Magnetically Guided Drug Delivery

Bhullar¹,

Goyal²,

Gupta³

2022

IJN

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Introduction Titanium dioxide nanoparticles (TiO 2 NPs) have shown tremendous potential in targeted drug-delivery applications. Among various mechanisms, magnetically guided transport of drugs is one such technique for the said purpose. TiO 2 NPs being diamagnetic or sometimes exhibiting very weak ferromagnetism can be modified by treating them with suitable magnetic materials. Methods Rutile TiO 2 NPs were synthesized and doped with Iron Supplement FericipXT and rare-earth metals like cerium, erbium and neodymium via sol–gel technique. FericipXT-coated rutile TiO 2 NPs were synthesized in three different core-shell ratios (1:3, 1:1 and 3:1). The resulting samples were characterized via X-ray Diffraction (XRD), Vibrating Sample Magnetometer (VSM) and High-Resolution Transmission Electron Microscopy (HR-TEM). Results XRD of FericipXT-doped TiO 2 NPs showed a rutile phase for 1% and 3% doping; however, only a small fraction of the maghemite phase was obtained for 5% doping. The XRD plots of Ce-doped, Er-doped and Nd-doped TiO 2 NPs showed a variety of phases of TiO 2 NPs (such as anatase/rutile/mixed) along with the oxide phases of the corresponding rare-earth metal. The presence of various iron titanium oxides and iron oxides was found in core-shell NPs. HR-TEM images confirmed the formation of 1:3, 1:1 and 3:1 core-shell TiO 2 NPs. VSM studies showed that the resulting NPs depicted magnetism in the form of superparamagnetism, ferromagnetism and even paramagnetism. Discussion The doping to 3% does not affect the original phase of the resulting TiO 2 NPs as depicted from the XRD; however, a doping of 5% and more resulted in extra phases corresponding to the dopant added. FericipXT was loaded over TiO 2 NPs in amorphous form. Among all the samples synthesized, FericipXT-coated TiO 2 NPs demonstrated the best magnetic ability. It was deduced that coating with a magnetic material drastically improves the magnetic character of the host NPs.

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Tailoring the room temperature ferromagnetism in TiO2 nanoparticles by modulating the concentration of surface oxygen vacancy via La incorporating

Cited by 15 publications

References 50 publications

Photothermal Cocatalytic Carbonylation of Isobutyl Amine with CO₂ over Bi₂O₃ Polymorphs under Visible-Light Irradiation

Photothermal Cocatalytic Carbonylation of Isobutyl Amine with CO₂ over Bi₂O₃ Polymorphs under Visible-Light Irradiation

Ultra-Violet-Assisted Scalable Method to Fabricate Oxygen-Vacancy-Rich Titanium-Dioxide Semiconductor Film for Water Decontamination under Natural Sunlight Irradiation

Synthesizing and Optimizing Rutile TiO2 Nanoparticles for Magnetically Guided Drug Delivery

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Tailoring the room temperature ferromagnetism in TiO2 nanoparticles by modulating the concentration of surface oxygen vacancy via La incorporating

Cited by 15 publications

References 50 publications

Photothermal Cocatalytic Carbonylation of Isobutyl Amine with CO2 over Bi2O3 Polymorphs under Visible-Light Irradiation

Photothermal Cocatalytic Carbonylation of Isobutyl Amine with CO2 over Bi2O3 Polymorphs under Visible-Light Irradiation

Ultra-Violet-Assisted Scalable Method to Fabricate Oxygen-Vacancy-Rich Titanium-Dioxide Semiconductor Film for Water Decontamination under Natural Sunlight Irradiation

Synthesizing and Optimizing Rutile TiO2 Nanoparticles for Magnetically Guided Drug Delivery

Contact Info

Product

Resources

About

Photothermal Cocatalytic Carbonylation of Isobutyl Amine with CO₂ over Bi₂O₃ Polymorphs under Visible-Light Irradiation

Photothermal Cocatalytic Carbonylation of Isobutyl Amine with CO₂ over Bi₂O₃ Polymorphs under Visible-Light Irradiation