JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Qijun Tang,Peiyao Xiong,Haiqiang Wang,Zhongbiao Wu
Photocatalytic CO 2 reduction to produce value-added products is considered a promising solution to solve the global energy crisis and the greenhouse effect. In this study, Ti 3 CN MXene was synthesized using a Lewis acidic etching method without the usage of toxic hydrofluoric acid (HF). Ti 3 CN MXene was then used as a support for the in situ hydrothermal growth of TiO 2 and Ru nanoparticles. In the presence of 0.5 wt% Ru, Ru-Ti 3 CN-TiO 2 shows CO and CH 4 production rates of 99.58 and 8.97 μmol/g, respectively, in 5 h under Xenon lamp irradiation, more than 20.5 and 9.3 times that of commercial P25. The enhancement in photocatalytic activity was attributed to the synergy between the in-situ growth of TiO 2 on Ti 3 CN MXene and Ru nanoparticles. It was proven experimentally that Ti 3 CN MXene can provide abundant pathways for electron transfer. The separation and transfer of the photo-induced charge were further increased with the help of Ru and Ti 3 CN MXene, leaving more electrons to participate in the subsequent CO 2 reduction reaction. We believe that this work will encourage more attention to designing environment-friendly MXene-based photocatalysts for CO 2 photoreduction using the non-HF method.
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 9
·1474
·
IF 5.719
Zhenzi Li,Decai Yang,Hongqi Chu,Liping Guo,Tao Chen,Yifan Mu,Xiangyi He,Xueyan Zhong,Baoxia Huang,Shiyu Zhang,Yue Gao,Yuxiu Wei,Shijie Wang,Wei Zhou
Interface engineering is usually considered to be an efficient strategy to promote the separation and migration of photoexcited electron-hole pairs and improve photocatalytic performance. Herein, reduced graphene oxide/mesoporous titanium dioxide nanotube heterojunction assemblies (rGO/TiO2) are fabricated via a facile hydrothermal method. The rGO is anchored on the surface of TiO2nanosheet assembled nanotubes in a tightly manner due to the laminated effect, in which the formed heterojunction interface becomes efficient charge transfer channels to boost the photocatalytic performance. The resultant rGO/TiO2heterojunction assemblies extend the photoresponse to the visible light region and exhibit an excellent photocatalytic hydrogen production rate of 932.9 μmol h−1g−1under simulated sunlight (AM 1.5G), which is much higher than that of pristine TiO2nanotubes (768.4 μmol h−1g−1). The enhancement can be ascribed to the formation of a heterojunction assembly, establishing effective charge transfer channels and favoring spatial charge separation, the introduced rGO acting as an electron acceptor and the two-dimensional mesoporous nanosheets structure supplying a large surface area and adequate surface active sites. This heterojunction assembly will have potential applications in energy fields.Keywords:TiO2;photocatalysis;mesoporous structure;assembly;heterojunction
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LANGMUIR
·
2022
·
IF 4.331
Qiangtao Zhu,Dongyu Pan,Yangyi Sun,Dongming Qi
Hollow structures in TiO2 materials can enhance the photocatalytic properties by reducing the diffusion length and improving the accessibility of active sites for the reactants. However, existing approaches for preparing hollow TiO2 materials have two drawbacks that restrict their engineering applicability: first, a heavy reliance on templates to form a hollow structure, which makes the preparation laborious, complicated, and costly; second, difficult-to-achieve high crystallization while maintaining the small grain size in calcinated TiO2, which is crucial for enhancing photocatalytic activity. Herein, a simple, effective method is proposed that not only enables the preparation of hybrid TiO2–SiO2 hollow spheres without the template fabrication and removal process via microemulsion technology but also achieves both high crystallization and a small grain size in calcinated TiO2 at once through the calcination of amorphous TiO2 with organosilane at a high temperature of 850 °C. The prepared TiO2–SiO2 hollow spheres with tunable sizes demonstrate high photocatalytic activity with a maximum k value of 133.74 × 10–3 min–1, which is superior to commercial photocatalyst P25 (k = 114.97 × 10–3 min–1). In addition, Au can be doped in the hybrid TiO2–SiO2 shell to gain Au-doped hollow spheres that show a high k value of up to 694.14 × 10–3 min–1, which is 6 times larger than that of P25 and much better than that reported in the literature. This study not only provides an effective approach to stabilize and tune the grain growth of the TiO2 photocatalyst during calcination but also enables the simple preparation of hollow TiO2-based materials with controllable hollow nanostructures.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 15
·7070-7077
·
IF 3.925
Zheng Lu,Wenxian Wei,Jingjing Yang,Qin Xu,Xiao-Ya Hu
A novel Ag triangle nanoparticles/TiO2 nanorod array (AgNTs/TNA) heterostructure was designed as a surface-enhanced Raman scattering (SERS) active substrate for the sensitive detection of Rhodamine 6G (R6G), Crystal Violet (CV), Malachite Green (MG) and Thiram in food samples. The heterostructure was constructed by simply stacking AgNTs and hydrothermally prepared rutile TNA together. On the surface of the heterostructure, the intensity of the Raman scattering intensity was about two times stronger compared with that on the AgNT substrate, using the R6G molecule as a probe. The AgNTs/TNA heterostructure could detect the SERS signal of R6G down to 10−10 M, showing excellent SERS performance. This platform has been successfully applied for the detection of CV and MG residues in crayfish. When irradiated with ultraviolet light, the SERS substrates can be cleaned and reused. This work demonstrated that the AgNTs/TNA metal–semiconductor heterostructure with high sensitivity, reproducibility and recyclability could provide an alternative reliable platform for food additive analysis.
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DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Shen Shen,Kunlin Chen,Hongbo Wang,Jiajia Fu
Element decomposition is a promising modification technique for enhancing the photocatalytic activity of TiO 2 . Firstly, (i) It may accelerate photogenerated electron–hole separation as electron traps , (ii) broaden the sunlight absorption region into the visible range and promote surface electron excitation by plasmon resonances excited under visible light and (iii) modify the surface performance of semiconductors. Herein, we describe the introduction of carbon dots (CDs) as solid-state electron mediator on TiO 2 sheets (TNs) via a highly effective hydrothermal process. The as-prepared CDs/TNs nanocomposites was measured by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy , UV–visible diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy analysis. The results proved that CDs were firmly scattered in the TNs interface. Furthermore, the resultant CDs/TNs nanocomposites exhibited remarkable photocatalytic activity for the degradation of different model pollutants under visible light, which is considerably superior to that of bare TNs. The enhanced photocatalytic activity highlights that CDs can promote the separation and migration efficiency of photoexcited electron–hole pairs. The striking stability of CDs/TNs was investigated by performing five successive cycles of degradation of Congo red. Moreover, the degradation intermediates of three pollutants were monitored by liquid chromatography-tandem mass spectrometry, and potential removal pathways are proposed. We firmly believe that this work may inspire new insights and approaches for the design of highly efficient photocatalysts .
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2022
·Vol. 102
·期 11
·4589-4598
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IF 4.125
Wenshuo Zhang,Xiaojie Liu,Shibo Qiu,Lin Chen,Xinghai Liu
BACKGROUND A shelf-life that is too short is the main problem with strawberries. Nano-TiO 2 can catalyze and oxidize ethylene under ultraviolet (UV) light irradiation to eliminate its ripening effect on fruits and prolong the freshness period. RESULTS In this work, nano-TiO 2 modified by methacryloxy propyl trimethoxyl silane (KH570) was blended with low-density polyethylene (LDPE) to prepare modified atmosphere packaging (MAP), and the influence of TiO 2 content on films was analyzed before and after UV treatment. The results show that the modified nano-TiO 2 (M-TiO 2 ) can be uniformly distributed in LDPE, improving its mechanical strength, hydrophobicity, oxygen barrier and UV shielding properties. A modified atmosphere with low ethylene, low O 2 and high CO 2 can be created to inhibit the ripening and spoilage of strawberries. The weight loss rate of fruit can be effectively reduced. The tendency of fruit firmness decline and nutrient loss can be slowed and stabilized, contributing to controllable shelf-life. Excellent freshness preservation function can be realized without special UV treatment. CONCLUSION Since UV treatment is rare in actual storage and transportation, LDPE/M-TiO 2 composite film has practical value as MAP for strawberry and similar non-climacteric fruits. © 2022 Society of Chemical Industry.
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CHEMOSPHERE
·
2022
·
IF 8.943
Di Liu,Yunning Chen,Renquan Guan,Jie Zhao,Huimin Jin,Siyi Zhang,Qingkun Shang
In this paper, a type of heterojunction photocatalyst S-Tyr-NDI-Tyr/TiO 2 was prepared by self-assembly of tyrosine-substituted naphthamide (NDA) and bonding with titanium dioxide. The self-assembly process and driving force of monomer M-Tyr-NDI-Tyr were simulated by theoretical calculation. Taking atenolol as the target pollutant, the photocatalytic performance of the heterojunction photocatalyst under visible light was studied, and the degradation products were analyzed by mass spectrometry. The environmental toxicity of photocatalytic process was evaluated by luminescent bacteria. The principle of high photocatalytic activity of S-Tyr-NDI-Tyr/TiO 2 heterojunction photocatalyst was proposed by analyzing the fluorescence spectrum, photocurrent density and resistance, electron paramagnetic resonance spectrum, free radical capture experiment and energy band position of S-Tyr-NDI-Tyr/TiO 2 heterojunction photocatalyst. In addition, the photocatalytic degradation of different pollutants by S-Tyr-NDI-Tyr/TiO 2 heterojunction photocatalyst was also studied. This work will provide a useful example for the further development of new and efficient organic supramolecular/inorganic semiconductor composite photocatalysts.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 10
·5505-5519
·
IF 14.511
Xu Tian,Lijia Yao,Xiuxiu Cui,Rongjun Zhao,Ting Chen,Xuechun Xiao,Yude Wang
Two-dimensional nanomaterials have exhibited considerable potential for gas sensing applications in recent years owing to their unique physical and chemical properties such as a large surface-to-volume ratio, abundant edge sites, versatile surface chemistry, etc. Herein, we demonstrate a two-dimensional Ti3C2TX MXene@TiO2/MoS2 nanocomposite gas sensor for ammonia detection at room temperature. MoS2 nanosheets are grown on an etched Ti3C2TX MXene surface by a hydrothermal method, and rectangular TiO2 particles are derived from Ti3C2TX MXene in the hydrothermal process. Meanwhile, nanocomposites with different Ti3C2TX MXene additions are also designed for gas sensing performance comparison. Such a novel hierarchical structure based gas sensor (MTM-0.2 sensor) exhibits fast response/recovery time and excellent long-term stability to ammonia. Meanwhile, outstanding selectivity to ammonia against triethylamine, trimethylamine, n-butanol, acetone, formaldehyde, and nitrogen dioxide at room temperature is also shown. The sensor shows 1.79-fold and 2.75-fold enhancement in the gas sensing response toward 100 ppm ammonia compared with the pristine Ti3C2TX MXene and MoS2 gas sensors, respectively. And its detection limit for ammonia is 500 ppb. The sensing mechanisms of the Ti3C2TX MXene@TiO2/MoS2 nanocomposites toward ammonia are attributed to the layered nanostructure, p–n heterojunction created at the interface of p-type Ti3C2TX MXene and n-type MoS2. Finally, density-functional theory (DFT) is performed to investigate the adsorption behavior and charge transfer of ammonia molecules on the surface of the nanocomposite. The synthesized Ti3C2TX MXene@TiO2/MoS2 nanocomposite can be regarded as a promising candidate for high-performance ammonia detection at room temperature.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Shaodi Sun,Xiaomin Wu,Zhiwei Huang,Huazheng Shen,Huawang Zhao,Guohua Jing
The strong metal-support interaction (SMSI) has received wide attention in heterogeneous catalysis for the room-temperature oxidation of formaldehyde. An interaction between Pt nanoclusters and oxygen vacancy defects will lead to SMSI over the Pt-based catalysts. In this study, defective two-dimensional (2D) TiO 2 nanosheets were synthesized and successfully anchored Pt nanoclusters with a size of 1.3 nm (0.1Pt/TiO 2 -NS). The 0.1Pt/TiO 2 -NS catalyst displayed a superior activity of > 95% HCHO conversion at room temperature, which was ∼ 50% higher than that obtained for a counterpart having the commercial TiO 2 (Degussa P25) support. The abundant oxygen vacancies and stable Pt nanoclusters on 0.1Pt/TiO 2 -NS by introducing SMSI boosted the excellent activity and stability of HCHO oxidation. By exploring electron transfer, suppression of small-molecule adsorption and encapsulation, SMSI was well demonstrated. Furthermore, electron transfer from Pt to TiO 2 -NS led to the electron-deficient Pt surface. The electron-deficient Pt caused by SMSI will enhance the adsorptions of HCHO and H 2 O/O 2 , subsequently improving the catalytic performance. SMSI between Pt nanoclusters and oxygen vacancies endowed the 0.1Pt/TiO 2 -NS catalyst excellent activity and stability to HCHO elimination. In addition, the mechanism for the high HCHO oxidation performance were examined through analysis of in situ HCHO-diffuse reflectance infrared Fourier transform spectra (DRIFTS).
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ELECTROCHEMISTRY COMMUNICATIONS
·
2022
·
IF 5.443
Zixue Su,Hui Li
This work reports an electrochemical synthesis of (NH 4 ) 3 TiOF 5 mesocrystals consisting of nanocrystalline building units, via oriented particle attachment driven by an external electric field. The obtained (NH 4 ) 3 TiOF 5 mesocrystals are octahedral in shape and can be converted to porous anatase TiO 2 , retaining their octahedral morphology after thermal annealing treatment. A distinctive evolution process for the (NH 4 ) 3 TiOF 5 mesocrystals with octahedral morphology is revealed, which includes the nucleation and growth of primary small octahedral particles, oriented aggregation of six primary octahedral particles into one large secondary particle, formation of mesocrystalline octahedrons by crystallographic fusion, dissolution of the octahedrons into small nanoparticles, followed by oriented aggregation of the dissolved nanoparticles to form micrometer-sized octahedrons. The alignment and subsequent oriented attachment of nanoparticles driven by an external electric field enable the rapid growth of (NH 4 ) 3 TiOF 5 mesocrystals within 40 s, compared with the tens of hours usually required for the growth of NH 4 TiOF 3 mesocrystals using a hydrothermal method.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Shasha Tang,Jie Yao,Hongyuan Liu,Yan Zhang
Although considered as a promising candidate for photocatalytic bromate reduction, TiO 2 is restricted by its fast recombination of photo-induced charge carriers. In this paper, a series of efficient photocatalysts (TiO 2 /TC) were prepared by coupling commercial titania (P25) with titanium carbide MXene (Ti 3 C 2 ) via a simple hydrothermal method, where Ti 3 C 2 was utilized as a noble-metal-free cocatalyst. Batch experiments of photocatalytic bromate removal by TiO 2 /TC composites were conducted under UV irradiation. Its performance and mechanism were also investigated. The results showed that more than 95% of bromate could be removed by TiO 2 /TC-1 composite (Ti 3 C 2 and P25 in a mass ratio of 1%) in 15 min, and its removal rate was 4.87 times higher than that of pure P25. The photocatalytic reduction of bromate by TiO 2 /TC was an interfacial reaction, and bromide was the main product. The greatly improved activity of TiO 2 /TC composites was attributed to the improved separation efficiency of photogenerated charge carriers and narrower band gap. TiO 2 /TC-1 composite exhibited a longer lifetime (6.05 ns) of electron-hole pairs than pristine P25 (4.31 ns). Moreover, due to its excellent electrical conductivity, Ti 3 C 2 functioned as “an electron sink” to accumulate photoinduced electrons from the excited P25. And the Schottky barrier formed in the tight Ti 3 C 2 -P25 interface provided a unidirectional channel for electron transfer , facilitating the separation of electron-hole pairs. In addition, TiO 2 /TC-1 composite had a good stability in bromate removal. This work highlights the potential of Ti 3 C 2 as a noble-metal-free photocatalytic cocatalyst and explores the possible expansion of the application of MXene.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yongkang Shi,Yan Nie,Hualong Xu,Pengyu Bi,Boyang Chen,Xinyue Hou,Hongchao Ma,Meiwen Cao
Surface coating technology is an effective anti-corrosion strategy which can form a layer of anti-corrosion film on metal surface , effectively preventing it from oxidation and corrosion. Among various strategies, silanization treatment of metals is the most commonly used one. However, using silane-based coatings alone often leads to poor anti-corrosion performance due to insufficient mechanical strength and presence of surface defects . In order to improve the corrosion resistance of silane coatings, a hybrid surface coating has been constructed by introducing epoxy resin and Ag/TiO 2 nanoparticles into the silane film in this work. After adding epoxy resin, the thickness of the silane film greatly increases, which improves its mechanical properties . Ag/TiO 2 nanoparticles can enhance the cross-linking between silane molecules and epoxy resin, thereby preventing formation of surface defects. The epoxy resin-silane-Ag/TiO 2 composite surface coating is coated on the surface of AA2024 aluminum alloy using spin coating method. Electrochemical and salt spray tests indicate excellent corrosion resistance performance of the composite coating . This composite coating technology may have potential applications on the surfaces of various metal products such as medical devices and aerospace materials, and will shed light on the development of new surface coating technologies.
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