Ti3C2 MXene nanosheet/TiO2 composites for efficient visible light photocatalytic activity

Chen, Long; Ye, Xiaoyun; Chen, Song; Ma, L.A.; Wang, Zhanhui; Wang, Qianting; Hua, Nengbin; Xiao, Xu; Cai, Shuqun; Liu, Xuehua

doi:10.1016/j.ceramint.2020.07.074

Cited by 88 publications

(32 citation statements)

References 67 publications

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“…The product concentration is below the limit of detection when the experiments were carried out in the absence of catalyst or irradiation or in Ar, proving that the detectable CO and CH 4 were derived from photocatalytic CO 2 reduction over (001)TiO 2 /Ti 3 C 2 T x . To further disclose the origin of the products, an isotopically labeled 13 CO 2 experiment was performed. As shown in Figure 4c,d, the strong signals were observed at m/z = 17 and = 29, which were attributed to 13 CH 4 and 13 CO, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…To further disclose the origin of the products, an isotopically labeled 13 CO 2 experiment was performed. As shown in Figure 4c,d, the strong signals were observed at m/z = 17 and = 29, which were attributed to 13 CH 4 and 13 CO, respectively. This result further confirms that the reduction products indeed originate from the CO 2 photoreduction rather than from the impurity or the sample.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, various syntheses for 2 of 13 different-dimension MXenes (e.g., quantum nanodots, nanorods, and nanosheets) have been reported [10]. Among all the MXenes, Ti 3 C 2 is one of the most representative and prevalently studied materials in the field of photocatalysis, especially as a co-catalyst, because of the following reasons: (i) Its intrinsically metallic conductivity assures the efficient separation and transfer of photogenerated charge carriers from semiconductors [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Facile Preparation of Highly Active CO2 Reduction (001)TiO2/Ti3C2Tx Photocatalyst from Ti3AlC2 with Less Fluorine

Tan

et al. 2022

Catalysts

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To date, (001)TiO2/Ti3C2Tx hybridized photocatalyst is usually prepared through the complicated treatment of Ti3AlC2 in the presence of corrosive fluorine with a molar ratio of nF:nTi of more than 20. To reduce the use of corrosive fluorine, herein, exploiting beyond the conventional method, we report a facile synthetic method for (001)TiO2/Ti3C2Tx, elaborately using HF as both an etchant for Al elimination and a morphology control agent for the growth of (001)TiO2 nanosheets, with a sharply diminished use of fluorine (nF:nTi = 4:1) and simplified operation procedures. After optimization, the resulting (001)TiO2/Ti3C2Tx heterojunction exhibited markedly high photocatalytic activity with the CO2 reduction rate of 13.45 μmol g−1 h−1, which even surpasses that of P25 (10.95 μmol g−1 h−1), while the photoelectron selectivity to CH4 is approaching 92.84%. The superior photoactivity is interpreted as the fact that Ti3C2Tx with a lower work function induces photoinduced hole transfer and suppresses the charge recombination, thus facilitating the CO2 multi-electron reduction. This study provides a novel and simple synthesis for (001)TiO2/Ti3C2Tx towards sustainable energy transformations.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Facile Preparation of Highly Active CO2 Reduction (001)TiO2/Ti3C2Tx Photocatalyst from Ti3AlC2 with Less Fluorine

Tan

et al. 2022

Catalysts

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“…The diffraction peaks located at 9.59°, 19.20°, 34.07°, 36.81°, 39.09°, 41.82°, 48.59°, 53.18°, 56.57°, and 60.31° correspond to (002), (004), (101), (103), (104), (105), (107), (108), (109) and (110) crystal planes of Ti 3 AlC 2 , [46–48] respectively. After HF etching, the most intense peak located at 39.09° in Ti 3 AlC 2 disappears, and the low‐angle (002) crystal face exhibits a lower angular shift, indicating that Ti 3 AlC 2 has been successfully converted to Ti 3 C 2 T x [46–48] . The as‐prepared 3D hierarchical Ti 3 C 2 T x was calcined at different temperatures for 1 h, and the corresponding XRD patterns are shown in Figure 4b.…”

Section: Resultsmentioning

confidence: 99%

A 3D Hierarchical Ti₃C₂T_x/TiO₂ Heterojunction for Enhanced Photocatalytic CO₂ Reduction

Song

Cao

2021

ChemNanoMat

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The construction of three‐dimensional (3D) hierarchical photocatalysts from two‐dimensional (2D) nanosheets has attracted lots of interest due to its unique structural properties. Herein we design a 3D hierarchical structure of Ti3C2Tx based on its 2D prototype as a precursor. TiO2 is in‐situ formed on the surface of Ti3C2Tx nanosheet by calcination, thereby obtaining a 3D hierarchical TiO2/Ti3C2Tx heterojunction. The rational design induces the intimate coupling of TiO2 and Ti3C2Tx, and macro‐mesopores in the hierarchical structure. The optimized sample exhibits a relatively high photocatalytic CH4 evolution activity of 4.41 μmol ⋅ g−1 ⋅ h−1, which is almost twice that of P25 (2.32 μmol ⋅ g−1 ⋅ h−1). The enhanced photocatalytic performance arises from the more efficient electron‐hole separation and better light harvesting of the 3D hierarchical structure. Moreover, the excellent CO2 adsorption ability of Ti3C2Tx also ensures effective contact between CO2 molecules and photoinduced electrons from TiO2. This work demonstrates a facile strategy for the preparation of precursor‐induced functional materials toward various applications.

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“…These results are consistent with the previous reports. 37 − 40 The fixed area ratio of Ti 2p 3/2 and Ti 2p 1/2 is around 2:1 with a doublet separation of 5.7 eV. By comparing the valence of Ti in the pristine Ti 3 C 2 T x nanosheets with the prepared TiO 2 /Ti 3 C 2 T x nanocomposite, we can notice the disappearing of the area fraction of Ti(I), Ti(II), and Ti(III) species and an increase in the area fraction of Ti(IV), indicating a transformation of Ti from Ti(I), Ti(II), and Ti(III) to Ti(IV).…”

Section: Results and Discussionmentioning

confidence: 99%

Efficient Photocatalytic Degradation of Organic Dyes by AgNPs/TiO₂/Ti₃C₂T_x MXene Composites under UV and Solar Light

et al. 2021

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Due to their broad applications in various industrial activities, and their well-known negative impacts on the aquatic environment, organic dyes have been continuously identified as serious threat to the quality of ecosystems. The photocatalytic degradation process in aqueous solutions has emerged as an efficient and reliable approach for the removal of organic dyes. MXenes, a new class of two-dimensional (2D) nanomaterials, possess unique chemical composition, surface functionalities, and physicochemical properties. Such characteristics enable MXenes to act as efficient catalysts or cocatalysts to photodegrade organic molecules. This work explores the application of Ti 3 C 2 T x MXene decorated with silver and palladium nanoparticles, using a simple hydrothermal treatment method, for the photocatalytic degradation of methylene blue (MB) and rhodamine B (RhB). The chemical composition of these photocatalysts, as well as their structural properties and morphology, was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) techniques. The photocatalytic degradation abilities of the pristine MXene and the synthesized MXene composites were investigated under ultraviolet and solar light irradiation. A significant improvement in the photocatalytic performances was observed for all oxidized MXene composites when compared to pristine MXene, with a superior degradation efficiency achieved for AgNPs/TiO 2 /Ti 3 C 2 T x . This work broadens the application range of oxidized MXene composites, providing an alternative material for degrading organics dyes and wastewater treatment applications.

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Ti3C2 MXene nanosheet/TiO2 composites for efficient visible light photocatalytic activity

Cited by 88 publications

References 67 publications

Facile Preparation of Highly Active CO2 Reduction (001)TiO2/Ti3C2Tx Photocatalyst from Ti3AlC2 with Less Fluorine

Facile Preparation of Highly Active CO2 Reduction (001)TiO2/Ti3C2Tx Photocatalyst from Ti3AlC2 with Less Fluorine

A 3D Hierarchical Ti₃C₂T_x/TiO₂ Heterojunction for Enhanced Photocatalytic CO₂ Reduction

Efficient Photocatalytic Degradation of Organic Dyes by AgNPs/TiO₂/Ti₃C₂T_x MXene Composites under UV and Solar Light

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Ti3C2 MXene nanosheet/TiO2 composites for efficient visible light photocatalytic activity

Cited by 88 publications

References 67 publications

Facile Preparation of Highly Active CO2 Reduction (001)TiO2/Ti3C2Tx Photocatalyst from Ti3AlC2 with Less Fluorine

Facile Preparation of Highly Active CO2 Reduction (001)TiO2/Ti3C2Tx Photocatalyst from Ti3AlC2 with Less Fluorine

A 3D Hierarchical Ti3C2Tx/TiO2 Heterojunction for Enhanced Photocatalytic CO2 Reduction

Efficient Photocatalytic Degradation of Organic Dyes by AgNPs/TiO2/Ti3C2Tx MXene Composites under UV and Solar Light

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A 3D Hierarchical Ti₃C₂T_x/TiO₂ Heterojunction for Enhanced Photocatalytic CO₂ Reduction

Efficient Photocatalytic Degradation of Organic Dyes by AgNPs/TiO₂/Ti₃C₂T_x MXene Composites under UV and Solar Light