Preparation and characterization of Cu-doped TiO2 nanomaterials with anatase/rutile/brookite triphasic structure and their photocatalytic activity

Zhu, Xiaodong; Zhou, Qin; Xia, Yangwen; Wang, Juan; Chen, Hongjin; Xu, Qiao; Liu, Jiawei; Feng, Wei; Chen, Shanhua

doi:10.1007/s10854-021-06660-5

Cited by 45 publications

(22 citation statements)

References 52 publications

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“…The high-resolution spectra of O 1s are shown in Figure 4 c. The O 1s of PT was decomposed into two peaks corresponding to the lattice oxygen (O L ) and surface hydroxyl (O H ), located at 529.9 eV and 531.2 eV, respectively. The peaks of the lattice oxygen and surface hydroxyl of LST sample were at 530.0 eV and 531.1 eV respectively [ 30 ]. It can be observed that the surface hydroxyl peak area of the LST sample was significantly larger than that of PT, indicating that the co-doping advanced the surface adsorption performance and introduced more OH − groups on the particle surface.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photocatalytic Activity of Anatase/Rutile Heterojunctions by Lanthanum and Tin Co-Doping

Zhu

Qin

et al. 2022

IJMS

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Anatase/rutile heterojunctions were prepared using the sol–gel method and modified by La/Sn single doping and co-doping. Sn doping promoted the transformation from anatase to rutile, while La doping inhibited the phase transformation. La and Sn co-doping showed an inhibitory effect. The co-doping of La and Sn did not increase visible-light absorption, but exhibited a synergistic effect on inhibiting the recombination of photogenerated electrons and holes, which improved the photocatalytic activity on the basis of single-element modification. The first-order reaction rate constant of La/Sn co-doped sample was 0.027 min−1, which is 1.8 times higher than that of pure TiO2 (0.015 min−1). Meanwhile, the mechanism of photodegradation of methylene blue (MB) by La/Sn co-doped anatase/rutile heterojunctions was discussed through electrochemical measurements and free-radical trapping experiments.

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Section: Resultsmentioning

confidence: 99%

Enhanced Photocatalytic Activity of Anatase/Rutile Heterojunctions by Lanthanum and Tin Co-Doping

Zhu

Qin

et al. 2022

IJMS

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“…The active species of CT650-R25 and CT650-R0 during the photodegradation process were studied. Ammonium oxalate (AO), 1,4-benzoquinone (BQ) and tert-butanol (TBA) [ 1 ] were added to capture superoxide radical species ·O 2 − , h + and hydroxyl radicals (·OH), respectively. The different degradation results of CT650-R25 are exhibited in Figure 6 a.…”

Section: Resultsmentioning

confidence: 99%

“…With the continuous growth in population and rapid development of the economy, the problem of environmental pollution has increased. Organic dyes such as methyl orange (MO), methylene blue and rhodamine [ 1 ], and antibiotics such as tetracycline (TC) [ 2 , 3 ], have become major pollutants affecting the water environment. Untreated organic dyes are often slowly naturally degraded.…”

Section: Introductionmentioning

confidence: 99%

Controllable Phase Transformation and Enhanced Photocatalytic Performance of Nano-TiO2 by Using Oxalic Acid

et al. 2022

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Degradation of organic pollutants, especially organic dyes and antibiotics, by semiconductor photocatalysts is an efficient strategy for wastewater treatment. TiO2 nanomaterials are considered to be promising photocatalysts due to their high chemical stability, high efficiency and availability. Anatase TiO2 generally has superior photocatalytic activity to the rutile phase. However, the anatase phase can be irreversibly transformed to rutile phase when calcined at an elevated temperature. Methods to improve the stability of anatase are especially important for the TiO2 gas sensors working at high temperatures. The addition of strong acids can effectively suppress this transformation process. However, these strong acids are relatively expensive, corrosive and environmentally unfriendly. Herein, oxalic acid (OA) as a natural acid was used to control the hydrolysis process of tetrabutyl titanate (TBOT), leading to controllable crystalline phase transformation and reduced crystalline size of TiO2 on the nanoscale. What is more, the photocatalytic degradation performances were enhanced continuously when the molar ratio of OA to TBOT increased. The degradation reaction rate constants of CT650-R25 were about 10 times that of CT650-R0. The mechanism study shows that the enhanced photocatalytic activity can be attributed to the improved dispersibility, increased specific surface area and reduced recombination rates of photo-induced charge carriers and decreased energy bands as the concentration of OA increased. Thus, this work provides a simple, mild and effective method for controlling the crystalline forms of nano-TiO2 with enhanced photocatalytic performance towards waste water treatment.

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“…This decrease in band-gap energy shifts wavelengths from the ultraviolet to the visible region. Cu loading increases with the changes in band-gap energy and wavelength and TiO2-conjugated Cu shows more stability with higher photo-catalytic activity in visible light (λ > 400 nm) [8]. This process involves no expense as it occurs at room temperature under atmospheric pressure.…”

Section: Introductionmentioning

confidence: 99%

The Photo-Oxidation of CO from Ambient Air Using Catalytic Asphaltic Pavement

Mohammed¹,

Shnain²,

Alwasiti³

et al. 2023

ETJ

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The effectiveness of the oxidation of carbon dioxide gas emitted by an internal combustion engine was studied.• The CO conversion positively depends on Cu loading, light intensity, and relative humidity.• The best photo-oxidation efficiency of 56.4% was achieved after three hours of operation.Road transportation in urban areas may be considered a major source of environmental pollution. The purpose of this study is to determine the effectiveness of the oxidation of carbon dioxide gas emitted by an internal combustion engine. This is achieved using an asphaltic pavement coated with Cu/TiO 2 nanoparticles by spraying and irradiating with white light under ambient conditions to reduce the air pollution problem (carbon monoxide) caused by vehicles. Using electron microscopy, energy dispersive spectroscopy, and Fourier transform infrared spectroscopy, we determined the physicochemical and morphological characteristics of the photocatalyst. Following the characterization study, the photo-catalytic activity of the asphalt materials was determined.Experimental results showed that CO conversion positively depends on different conditions, including Cu loading, light intensity, and relative humidity. However, the gas flow rate showed a different trend. The optimal operating parameters were determined as follows: Cu loading (3.6% by weight), a flow rate of gas (1 L/min), relative humidity (30%), and light intensity (35 W/m 2 ) to ensure the best photo-oxidation efficiency of 56.4% after three hours of operation. A mathematical correlation related to CO 2 removal as a function of different operating conditions was found with a correlation factor of 0.975 and a variance equal to 0.964. Moreover, a kinetic pathway for photo-oxidation of CO at various oxygen concentrations was presented.

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Preparation and characterization of Cu-doped TiO2 nanomaterials with anatase/rutile/brookite triphasic structure and their photocatalytic activity

Cited by 45 publications

References 52 publications

Enhanced Photocatalytic Activity of Anatase/Rutile Heterojunctions by Lanthanum and Tin Co-Doping

Enhanced Photocatalytic Activity of Anatase/Rutile Heterojunctions by Lanthanum and Tin Co-Doping

Controllable Phase Transformation and Enhanced Photocatalytic Performance of Nano-TiO2 by Using Oxalic Acid

The Photo-Oxidation of CO from Ambient Air Using Catalytic Asphaltic Pavement

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