JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 14
·10302-10312
·
IF 2.993
Fan Hongmei,Wu Rong,Liu Haiyang,Yang Xi,Sun Yanfei,Chen Chu
Hybrid-phase-MoS 2 (1T@2H-MoS 2 ) nanosheet-coated black TiO 2 spheres (1T@2H-MoS 2 /B-TiO 2 ) were prepared using a hydrothermal method and a chemical reduction method under an argon atmosphere. X-ray diffraction, transmission electron microscope, Raman spectra and X-ray photoelectron spectroscopy indicated the generation of the 1T@2H-MoS 2 and black TiO 2 . The efficiency of the 1T@2H-MoS 2 /B-TiO 2 core–shell structure degradation of rhodamine B (RhB) reached 98.0%. The high photocatalytic activity was due to the presence of 1T-MoS 2 , which accelerated the electron transfer to participate in the redox reaction. In addition, the presence of B-TiO 2 suppressed the undesirable electron–hole recombination. Finally, the synergistic effect between 1T@2H-MoS 2 and B-TiO 2 promoted the separation of the photoelectron–hole pairs. Moreover, scavenger studies found that the hydroxyl radical ( • OH) was the dominant reactive oxygen species in the degradation of RhB under visible light irradiation. The possible growth mechanism and photocatalytic mechanism are discussed in detail. The results of this study will contribute to the improvement in the visible light absorption and photocatalytic degradation of catalysts.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Bo Yu,Fanming Meng,Muhammad Wasim Khan,Rui Qin,Xingbin Liu
Traditional bulk photocatalysts often experience serious charge recombination and poor visible-light capturing, resulting in inefficient photocatalytic activity. However, proper nanostructure design usually helps to increase the activity of composite photocatalysts. Here, hollow TiO 2 @g-C 3 N 4 /Co 3 O 4 core-shell microspheres are first reported. The hollow structure of the heterostructured will directionally separate the photogenerated carriers, and the photogenerated holes transferred to the surface will be further captured by Co 3 O 4 to achieve an exposed oxidized surface. The novel multi-stage hollow microspheres can simultaneously achieve effective transfer of photogenerated carriers and extended light absorption. Benefiting from these structural and compositional characteristics, the optimized TiO 2 @g-C 3 N 4 /Co 3 O 4 nanospheres have excellent photodegradation activity for tetracycline and MO. Under simulated sunlight, the degradation rates of TC (10 mg/L) and MO (25 mg/L) at 60 min are 91.6% and 97.8%, respectively. At the same time, high activity is maintained after multiple cycles of testing. Possible transfer paths for photogenerated carriers have also been proposed. This work will provide more inspiration for the design of multi-stage hollow photocatalytic systems.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Di Pang,Yue Liu,Haiou Song,Duozhe Chen,Weiqing Zhu,Rumeng Liu,Hu Yang,Aimin Li,Shupeng Zhang
A trace Ti 3+ - and N-codoped TiO 2 nanotube array (TiON) anode is fabricated by electrochemical reduction after introducing nitrogen into the TiON. The TiON anode material is characterized by scanning electron microscopy, X-ray diffraction, Raman spectra and X-ray photoelectron spectroscopy. Electrochemical analyses of TiON, including cyclic voltammetry, electrochemical impedance spectroscopy and linear scan voltammetry, are conducted to confirm that the electrochemical performance could be significantly improved by electrochemical reduction and N doping. The achieved TiON anode is applied to the electrocatalytic oxidation of tetracycline (TC) and metronidazole (MNZ). The effect of applied current density, initial solution pH and initial TC/MNZ concentration on the reaction kinetics is systematically evaluated to obtain the optimal conditions. The degradation processes follow an apparent first-order kinetic model in all conditions. After 240 min of reaction time, the TC removal efficiency, chemical oxygen demand (COD) removal rate and total organic carbon (TOC) removal rate are >99%, 92.86% and 74.98%, respectively. The MNZ removal efficiency, COD and TOC removal rate achieved are >99%, 93.03% and 79.30%, respectively, after 240 min of degradation. The excellent removal efficiency of TC and MNZ indicates that this TiON anode is a promising material in the practical application of removing antibiotics from water.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Miao Xu,Shen Wang,Shengyu Zhou,Wenhai Sun,Zhenmin Ding,Xiang Zhang,Jiupeng Zhao,Yao Li
In this study, a novel TiO 2 @C@Prussian Blue core-shell nanorod arrays film was constructed through two-step hydrothermal and electrodeposition methods. Such a designed structure could increase the specific surface area, reactive site, and conductivity of Prussian Blue (PB) and reduce the diffusion distance of ions due to the nano-architecture arrays of TiO 2 and the high conductivity of the carbon layer, thus leading to the remarkably improved storage capacity and reaction speed of ions during the electrochromic (EC) process of PB. Moreover, porous morphology and strong adhesion on the FTO substrate of the TiO 2 nanorod arrays could alleviate the lattice stress and volume expansion and enhance the binding force, thus improving the cycle stability of EC. Given these benefits, the TiO 2 @C@PB films display a large optical modulation range (67%), fast switching speed (t c /t b = 1.25 s/2.71 s), and high coloration efficiency (129.4 cm 2 /C). In particular, the EC cycle stability is remarkably improved (96.3% after 5000 cycles), implying a promising application in high-performance EC devices (ECDs).
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NANOTECHNOLOGY
·
2018
·Vol. 30
·期 7
·075601
·
IF 3.404
Liang Shi,Chonglei Xu,Daixun Jiang,Xun Sun,Xiaopeng Wang,Qicong Wang,Yelong Zhang,Xiaofei Qu,Fanglin Du
Heterostructured photocatalysts play a significant role in the removal of contaminants by decreasing the recombination of the photo-induced charges. Herein, we presented novel TiO2/C/BiVO4 ternary hybrids employing a 2D layered Ti3C2 MXene precursor, overcoming the lattice mismatching of TiO2/BiVO4 binary heterostructures simultaneously. Raman and XPS analyses proved the strong coupling effects of TiO2, carbon and BiVO4 components, and the heterostructures were identified from high-resolution transmission electron microscopy results. Moreover, the ternary TiO2/C/BiVO4 composites exhibit excellent photocatalytic performance of Rhodamine B degradation, which is about four times higher than pure BiVO4 and twice that of binary TiO2/BiVO4 heterostructures, reaching a reaction constant of 13.7 × 10−3 min−1 under visible-light irradiation (λ > 420 nm). In addition, for the possible mechanism for dye elimination it was proposed that RhB molecule be directly oxidized by photo-induced holes (h+) on the BiVO4 components and superoxide radical ({{{\rm{O}}}_{2}}^{\cdot -}) generated from conduction band electrons of the heterostructures. This work will provide possibilities for developing visible-light responsive nanomaterials for efficient solar utilization.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2017
·Vol. 164
·期 12
·H707
·
IF 3.259
Xingzhi Wang,Zhuang Wang,Miao Zhang,Xishun Jiang,Yanfen Wang,Jianguo Lv,Gang He,Zhaoqi Sun
TiO2 nanorod (TNR) arrays have been sensitized by CdS, PbS, CdS/PbS, and PbS/CdS quantum-dots (QDs). The TNR arrays were synthesized by a hydrothermal treatment, and QDs were deposited on the arrays by a successive ionic layer adsorption and reaction (SILAR) technique. The morphology, structure, composition, optical, photoelectrochemical (PEC), and photocatalytic (PC) properties were systematically investigated. The results demonstrate that TNR/QDs can effectively facilitate photoinduced carrier transport, suppress the recombination rate of electron-hole pairs, and improve the visible light absorption, PEC, and PC properties. The TNR/CdS(7)/PbS(3) sample shows the maximal photocurrent density (0.91 mA/cm2) and photodegradation efficiency (97.3%), which is nearly 37.9 and 2.89 times higher than those of bare TNR, respectively. The enhanced properties are attributed to the narrow band gaps and high absorption coefficients of QDs, and the type-II nanoheterostructures with a staggered alignment of band edges at the hetero-interface that can facilitate the spatial separation of electron-hole pairs.
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ChemElectroChem
·
2020
·Vol. 8
·期 1
·90-95
·
IF 4.154
Chu Qi,Huilan Li,Jia Wang,Chengcheng Zhao,Cuimei Fu,Lina Wang,Tianxi Liu
Graphical MOF to a flame : This work demonstrates Ti-metal-organic-framework (Ti−MOF)-derived TiO 2 /C skeletons with in situ generated hierarchical pores and TiO 2 crystalline grains, which effectively encapsulate sulfur species and accelerate polysulfide conversion kinetics in lithium-sulfur batteries. The undesired internal shuttling of soluble polysulfide intermediates (Li 2 S n , 2
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Qingping Wu,Yao Cheng,Feng Huang,Xiao Li,Xiangshui Cui,Ju Xu,Yuansheng Wang
Atomic defects (e.g., Ti 3+ , oxygen vacancies) have been intenstively investigated for modifying TiO 2 in order to reach visible light active photocatalytic H 2 production. However, the atomic defects within TiO 2 could easily act as photo-generated charge-carrier recombination centers, resulting in relatively low H 2 conversion efficiency. In this paper, semicrystalline yellow TiO 2 nanoparticles rich of superoxide ions are new synthesized by a simple aqueous solution method. Instead of introducing atomic defects, we show for the first time that catalytic performance can also be significantly improved via in-situ creating lattice O O bonds within metastable semicrystalline TiO 2 . The synthesized semicrystalline yellow TiO 2 exhibits significantly enhanced photocatalytic activity for H 2 production after cycle tests. The formaldehyde in aqueous solution is used as target pollutant to simulate industrial wastewater. In-situ created elastic lattice O O bonds are proposed to improve catalytic performance through facilitating the breakage of C H bonds of HCHO. A series of internally consistent reaction equations is proposed that describes the role of in-situ created lattice O O bonds for improving the catalytic performance. This is strongly supported by that the H 2 production rate at the end of the fourth cycle test is significantly more than that of the beginning of the first cycle test.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 25
·11119-11129
·
IF 3.591
Zhenming Qi,Kuang Wang,Jiayi Chen,Dawei Gao,Yu Ren,Chunxia Wang
In this article, amino-functionalized TiO2 (TiO2/KH550) was obtained via a mild reaction between 3-aminopropyltriethoxysilane and TiO2 with the aid of concentrated ammonia solution. 4-((4,6-Dichloro-1,3,5-triazine-2-yl)amino) sodium benzenesulfonate (SAT) was synthesized and characterized using 1H NMR and Fourier transform infrared spectroscopy (FT-IR). Self-dispersive and reactive TiO2 (TiO2/KH550/SAT) was prepared via a nucleophile substitution reaction between TiO2/KH550 and SAT. Finally, cotton fabric samples loaded with different amounts of TiO2/KH550/SAT were achieved via an exhaust dyeing method. The chemical structures, dispersions, and thermal performances of TiO2, TiO2/KH550, and TiO2/KH550/SAT were investigated using FT-IR, zeta potential measurements, and thermogravimetric analysis (TG). The crystalline phase, morphology, chemical composition, and optical absorption properties of the cotton fabrics were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS). Moreover, the anti-ultraviolet, self-cleaning, and washing fastness properties of the cotton fabrics were investigated. It was found that TiO2/KH550/SAT demonstrated excellent dispersion stability in aqueous solution, even after standing for a month. Cotton fabrics loaded with TiO2/KH550/SAT exhibited attractive anti-ultraviolet performance, highly efficient and durable self-cleaning activity, and appreciable washing fastness. A mechanism and possible reactions related to the preparation of the self-cleaning cotton fabrics loaded with TiO2/KH550/SAT were proposed.
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高影响因子
SURFACE AND INTERFACE ANALYSIS
·
2021
·Vol. 54
·期 2
·156-164
·
IF 1.607
Li Jian
The TiO 2 is grafted by triethylamine and is introduced on the surface of the carbon fiber, which improves the wettability and activity of the carbon fiber surface and at the same time strengthens the carbon fiber/polyimide composite. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) confirmed the triethylamine grafting successfully on TiO 2 . Scanning electron microscope (SEM) results show that when the trimethylamine concentration is 1.0%, a uniform coating is formed on the surface of the carbon fiber. The interlaminar shear strength (ILSS) and interfacial shear strength (IFSS) were increased by 32% and 69%, respectively.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 8
·3487-3492
·
IF 3.288
Guopeng Chen,Guofeng Zhang,Fuchao Yang
Stimuli-responsive materials with appealing interactions can serve as key modules for smart devices and have a broad scope of application. In this study, Fe3O4@PDA@TiO2 microspheres with a core–shell structure were assembled. The hollow microspheres have a mesoporous structure and were characterized by SEM, TEM, XRD, Raman, BET, XPS, UV-vis and TGA analyses. Then, a photoresponsive coating with reversibly switchable wettability was prepared by a simple sieve-deposition method using Fe3O4@PDA@TiO2 powder. In addition, the Fe3O4@PDA@TiO2 coated fiber textile was obtained by a dipping method and was used for oil–water separation due to its underwater superoleophobicity. Finally, it was found that this material with its hollow and mesoporous structure can be used for dye adsorption, while the anatase TiO2 ingredient shows good photocatalysis performance.
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高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Changshui Tian,Wenlong Sheng,Heng Tan,Hong Jiang,Chunrong Xiong
In the past decades, enormous efforts have been made to synthesize photocatalysts for N2 conversion driven by visible light. However, it is still a major challenge to develop an efficient photocatalyst. In this paper, monodoped and codoped TiO2 nanofibers were fabricated by vapor-phase growth. Vapor-phase implantation of the guest atoms into TiO2 nanofibers may greatly prolong the lifetime of electron–hole pairs. The doped TiO2 nanofibers were demonstrated to be an excellent photocatalyst for nitrogen photofixation under a 300 W Xe-lamp irradiation. The amount of ammonia produced over the Fe, V codoped TiO2 nanofibers reached 14 783 μmol/L·g-cata after irradiation for 2 h. The strategy could be easily extended to prepare other species doped TiO2 nanofibers as high-efficiency photocatalysts.
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高影响因子
危险品化学品经营许可证（带存储）