Modification and functional investigation of self-assembled two-dimensional TiO2 nanosheets with abundant hydroxyl groups

Yang, Jing; Deng, Penghao; Wang, Xinyu; Huang, Jifa; Li, Pengkai

doi:10.1016/j.solidstatesciences.2020.106151

Cited by 5 publications

(1 citation statement)

References 26 publications

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“…The difference between photocatalytic results of composites prepared by physical blending and the hydrothermal method also supported this statement. The electron–hole pairs reacted with the surface-adsorbed H 2 O/OH – to produce • OH, which subsequently participated in the photocatalytic degradation reaction. ,, Meanwhile, a part of h + on the valence band could be directly transferred to oxidize methyl orange . Moreover, acting as remarkable electron collectors and transporters, CQDs could collect and store photogenerated electron from the conduction band of TiO 2 , thereby hindering the recombination of electron–hole pairs and further promoting the photocatalytic activity. ,, …”

Section: Resultsmentioning

confidence: 99%

Visible–Ultraviolet Upconversion Carbon Quantum Dots for Enhancement of the Photocatalytic Activity of Titanium Dioxide

Deng

Chen

et al. 2021

ACS Omega

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Visible–ultraviolet upconversion carbon quantum dots (CQDs) are synthesized with a hydrothermal method using l -glutamic acid ( l -Glu) and m -phenylenediamine (MPD) and then combined with commercial nano-TiO 2 to prepare CQDs/TiO 2 composites. The fluorescence spectra prove that the prepared CQDs can convert approximately 600 nm visible light into 350 nm ultraviolet light. In photocatalysis experiments, CT-1, a CQDs/TiO 2 composite with 1:1 molar ratio of l -Glu to TiO 2 , has the best degradation efficiency for methyl orange (MO). Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) experiments confirm that CT-1 is composed of quasi-spherical nano-TiO 2 and CQDs with a crystal plane of graphitic carbon. CT-1 can degrade 70.56% of MO (40 ppm) within 6 h under the irradiation of a 600 nm light source, which is close to its degradation rate of 78.75% under 365 nm ultraviolet light. The apparent rate constant of CT-1 degradation equation is 12.7 times that of TiO 2 . Free radical scavenging experiments and electron spin resonance (ESR) tests show that the degradation ability should be attributed to the existence of h + and • OH under visible light. Therefore, we provide a simple and low-cost solution with heavy-metal-free products to improve the photocatalytic performance of TiO 2 .

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