Enhanced Photocatalytic Activity by Cu₂O Nanoparticles Integrated H₂Ti₃O₇ Nanotubes for Removal of Mercaptan

Abstract

The Cu 2 O@H 2 Ti 3 O 7 nanocomposite was prepared through a facile hydrothermal method. The as-prepared samples were investigated by powder X-ray di®raction (XRD), high resolution transmission electron microscopy (HRTEM), laser Raman spectroscopy (LRS), N 2 adsorptiondesorption measurements and UV-Vis di®use re°ection spectroscopy (UV-Vis-DRS). The photocatalytic performance of the as-prepared Cu 2 O@H 2 Ti 3 O 7 nanocomposite is evaluated by the oxidation of ethyl mercaptan (EM) under sunlight irradiation. The results indicate that the Cu 2 O nanoparticles are integrated uniformly on H 2 Ti 3 O 7 nanotubes, and the absorption edge of the nanocomposite has obviously shifted to visible light region compared to H 2 Ti 3 O 7 nanotubes. There is an obvious synergistic e®ect existing between the dispersed Cu 2 O nanoparticles and H 2 Ti 3 O 7 nanotubes, and the Cu 2 O@H 2 Ti 3 O 7 composite shows stronger visible spectral response and wider absorbance. Then, an enchanced photodegradation activity is obtained for the removal of EM under sunlight irradiation compared to its precursors.

Desulfurization through Photocatalytic Oxidation: A Critical Review

“…[27] These free radicals have adequate redox ability to oxidize the sulfurcontaining compounds into less harmful or non-hazardous substances. [28,29] Since then, the research progress on PODS has witnessed a significant improvement with various ranges of photocatalysts from metallic inorganic substances to metal-free organic polymers, such as CeO 2 , [30] Fe 2 O 3 , [31] MoO 3 , [32] Cu 2 O, [33] TiO 2 , [34] SnO 2 , [35] WO 3 [36] and g-C 3 N 4 . [37] However, there are still research obstacles to be addressed, including the insufficient Xiaoyu Zhou is now a master student in the College of Chemistry and Chemical Engineering at Yangzhou University (China), under the supervision of Prof. Chengyin Wang.…”

Effect of Microstructures on the Acidity and Catalytic Performance for H2Ti3O7 Nanomaterials

“…The H 2 Ti 3 O 7 nanotubes have also three characteristic diffraction peaks with 2θ values of 10.0°, 24.4°and 48.5°, which are attributed to the (200), (110) and (020) crystal planes of protonated trititanate, respectively. [26] The morphological features of the as-prepared samples were characterized by SEM and TEM technologies, and results are showed in Figure 2 have an obvious 2D morphological feature, and the nanosheets appear brighter, which given that the sheet thickness is thinner. [27] The results indicate that the nanosheets come together loosely and appear extremely disordered arrangement.…”

“…One can find that the H 2 Ti 3 O 7 nanosheets and nanotubes show typical IV-type adsorption isotherms, indicating that the samples are mainly mesoporous materials. [26] And the adsorption and desorption isotherms form an IUPAC-type H3 hysteresis loop, which reveals the irregular structure of the pores. On the other hand, it can be seen that the pore-size distribution of the nanosheets is very wide, and the average pore diameter of the nanotubes corresponds to the inner diameter of the nanotubes.…”

“…The peak positioned around 187 cm À 1 is corresponded to the stretching vibration of TiÀ O bond, [30] and the peaks located at 267, 450 and 670 cm À 1 can be attributed to TiÀ O(H)À Ti stretching modes. [26,32,33] The Raman band at 828 cm À 1 can be assigned to TiÀ OÀ H oscillations with a very short TiÀ O distance, and the Raman band around 932 cm À 1 is resulted from TiÀ OÀ H oscillations with a four-coordinate TiÀ O vibration. [23,34,35] Compare with the Raman spectra of nanotubes, H 2 Ti 3 O 7 nanosheets exhibit another four peaks at around 225, 390, 689 and 879 cm À 1 .…”

A reclaimed piezoelectric catalyst of MoS2@TNr composites as high-performance anode materials for supercapacitors

“…Since the edge portions of the less-layered MoS 2 nanosheets possessed more exposed S 2À bonds, 71 the superposition of multiple layers might cause an adverse effect so that the internal piezoelectric elds would cancel each other, which would, in turn, affect the piezoelectric performance. 72 Therefore, the ultra-thin MoS 2 nanosheets existing in single or few layers were composited with the over-long TiO 2 nanorods as the MoS 2 @TNr composite; 25 in this case, the nanosheet stacking was badly restrained, and the carrier separation efficiency was greatly enhanced due to the synergistic effect. Fig.…”