Fabrication of CdTe QDs/BiOI-Promoted TiO2 Hollow Microspheres with Superior Photocatalytic Performance Under Simulated Sunlight

Abstract

Hollow and heterostructured architectures are recognized as an effective approach to improve photocatalytic performance. In this work, ternary TiO 2 /CdTe/BiOI with hollow structure was constructed via a step-by-step method. In addition, the effect of TiO 2 structural regulation and the energy band alignment of BiOI and CdTe quantum dots (CdTe QDs) with TiO 2 in TiO 2 /CdTe/BiOI on photocatalytic dye removal were also studied. The results reveal that the TiO 2 /CdTe/BiOI heterostructures with hollow substrates exhibit much higher photocatalytic activities than pure TiO 2 , P25, TiO 2 /CdTe, and TiO 2 /BiOI and ternary TiO 2 /CdTe/BiOI with solid substrates. For TiO 2 (H)/CdTe/BiOI, several synergistic factors may be responsible for the remarkable visible-light photodegradation performance, such as strong visible-light absorption by BiOI and larger specific surface area.

Wireframe Orbit-Accelerated Bipedal DNA Walker for Electrochemiluminescence Detection of Methyltransferase Activity

“…After the etching of inner cores, there were hollow nanospheres with well-defined boundaries and interior cavities (Figure E), confirming the successful etching of SiO 2 sacrificial template. Furthermore, as clearly shown in the enlarged image of the Rub@TiO 2 NS surface (Figure F), the shell was composed of highly crystalline nanocrystals with the interplanar spacing of ∼0.239 nm corresponding to (004) planes of the anatase TiO 2 with excellent photoelectric activity …”

“…Furthermore, as clearly shown in the enlarged image of the Rub@TiO 2 NS surface (Figure 1F), the shell was composed of highly crystalline nanocrystals with the interplanar spacing of ∼0.239 nm corresponding to (004) planes of the anatase TiO 2 with excellent photoelectric activity. 24 Optical Characterizations of the Prepared Hollow Material. The various optical characterizations of the prepared Rub@TiO 2 NSs were further investigated.…”

Investigations on Multiexciton Generation and Hot Electron Transfer Process in CdTe QD-Decorated TiO2 Nanostructures for Effective Photocatalytic Activity

“…The obtained result matches well with the shift of Ti 2p and indicates the formation of TiO 2 and a CdTe heterojunction. The Cd 3d and Te 3d spectra (Figure d,e) reveal Cd (3d 5/2 and Cd 3d 3/2 ) and Te (3d 5/2 and Cd 3d 3/2 ) states at BEs of 407.1 and 413.6 eV for Cd and at 567.2 and 580.1 eV for Te. , …”

“…For bare TiO 2 NRs and CdTe QDs/TiO 2 NRs, the BEs were observed at 457.6 and 463.3 eV with a blue shift of about 0.5 eV, confirming a strong interaction between CdTe and TiO 2 (Figure 5b). 27 The O 1s core level at 529.5 eV is related to the lattice oxygen in the bare TiO 2 NRs, indicating Ti−O bonds. 28 It is worth noting the shift toward the lower binding energy of the O 1s peak in the CdTe QD-decorated TiO 2 NRs, indicating loss of oxygen ions, which can be ascribed to the partial oxidation of QDs on TiO 2 (Figure .…”

Fabrication and characterization of a TiBs@MCN cable-like photocatalyst with high photocatalytic performance under visible light irradiation

“…[1][2][3][4][5] Among these methods, photocatalysis can transform solar energy into a sustainable chemical combustion, which is considered as one of the most promising green methods for wastewater treatment due to its environmental characteristics. [6][7][8] Thus, developing highly durable and efficient photocatalysts with an effective and eco-friendly strategy is of great importance. [9][10][11][12] TiO 2 is a most widely used photocatalyst due to its nontoxicity, low cost, good oxidation capacity and photostability.…”