CRYSTENGCOMM
·
2017
·Vol. 19
·期 18
·2509-2516
·
IF 3.474
Dedong Jia,Zhen Qi,Xuequan Li,Linlin Li,Li-Hua Shao,Hong Liu
TiO2 is one of the most extensively investigated materials owing to its unique properties and several promising applications. The properties of TiO2 are highly dependent on its microstructure and feature size. Herein, we report a strategy for the synthesis of hierarchical porous TiO2 with two distinguishable scales of ligament sizes, which consists of both macro-pores and meso-pores. A metallic melt dealloying process with CuTi alloy was followed to form a porous Ti precursor. Subsequently, this precursor was used as a substrate for anodization to form TiO2. By controlling the anodization potential, time and initial porous Ti ligament size, nanotubular nanotubes or nanoporous TiO2 were distributed uniformly on the ligaments of porous Ti. Both the sizes of the macropore (400 nm to 2 μm) and mesopore (10 to 30 nm) can be tuned. A core–shell structured TiO2/Ti composite with a nanoporous or nanotubular structure in the shell and un-anodized porous Ti in the core can be achieved by partial anodization. The hierarchical structure with high surface area is essential for mass transport (large pore) and functionality (small pore), which makes it a potential candidate for various applications such as in sensors and catalysts.
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Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 4
·1011-1021
·
IF 5.934
Junping Ma,Qiuyu Zhao,Dongli Wei,Haiqiang Liu,Xiangke Wang,Zhe Chen,Jianjun Wang
The adsorption remediation of radioactive contamination from wastewater is scientifically and economically important. In this work, titanium dioxide-modified manganese dioxide (MnO2@TiO2) was prepared by immobilizing crystalline anatase titanium dioxide (TiO2) on the surface of alpha manganese dioxide nanowire (MnO2). The base material MnO2 nanowire acted as a physical template for the guest TiO2, and the formed MnO2@TiO2 composite exhibited a highly uniform core–shell nanorod structure. The MnO2@TiO2 composite was investigated as an efficient adsorbent for the removal of U(VI) from aqueous solution. In the same system, MnO2@TiO2 exhibited a much higher maximum adsorption capacity (105.3 mg g−1) for U(VI) as compared with MnO2 (13.3 mg g−1), showing that the performance of the surface-modified MnO2 was greatly improved. The fitting results for kinetic and isothermal models manifested that U(VI) ion adsorption by MnO2@TiO2 involved monolayer chemisorption. Characterization before and after adsorption was performed and the results compared and analyzed carefully, with the conclusion that there might be three kinds of interactions between U(VI) and MnO2@TiO2 during the adsorption process, namely inner-sphere surface complexation, chemical precipitation, and electrostatic interaction. The low-cost, facile fabrication method and efficient performance endow the adsorbent MnO2@TiO2 with a high potential for U(VI) removal from actual wastewater.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 8
·9795-9803
·
IF 2.478
Wei Song,Miao Juhong,Shi Qiuwei,Shao Shaofeng,Zhang Lei
In order to obtain improvement in efficiency and stability of quantum dot light-emitting diodes (QLEDs), it is essential to seek carrier transport layer with higher carrier transport efficiency and better air stability. In terms of the high-performance carrier transport layer, solution-processed inorganic metal oxides show promise for efficient QLEDs because of their suitable energy band, high carrier mobility, especially their outstanding air stability. In this study, we employed high-quality oleic acid-capped TiO 2 nanocrystals as the electron transportation layer to fabricate air-stable inverted QLEDs. These TiO 2 nanocrystals have narrow size distribution, outstanding crystalline property, especially excellent air stability. To improve the interfacial carrier transportation performance of oleic acid-capped TiO 2 nanocrystals, we introduce a thionyl chloride (SOCl 2 ) post-ligand exchange process that replaces organic long-chain ligands with single inorganic ligands efficiently. The stability of oleic acid-capped TiO 2 -based QLEDs were evaluated by comparing with the traditional ZnO-based QLEDs. As a result, oleic acid-capped TiO 2 nanoparticles show excellent long-term air stability. This study offers an alternative strategy to deal with the stability issue of optoelectronic devices.
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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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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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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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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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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
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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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 2
·537-542
·
IF 3.069
Zhenyu Li,Fa Cao,Lei Wang,Zhiwu Chen,Xiaohong Ji
In this article, novel ternary MoS2/MoO3/TiO2 composite catalysts were developed. The photocatalytic performance of the ternary MoS2/MoO3/TiO2 composites was evaluated by photo-degradation of rhodamine B (RhB). It was found that the photocatalytic ability of the composites was strongly dependent on the mass ratio of MoS2–MoO3 to MoS2–MoO3–TiO2. The ternary composite catalyst with optimum composition showed a fast degradation rate (maximum ∼0.138 min−1), which could degrade over 95% of RhB solution (10 mg L−1) within 20 min under visible light (λ > 420 nm) irradiation. The possible photocatalytic mechanism was proposed based on the trapping photocatalytic experiment and band alignment of the composite. The synergistic effect of the strong absorption of the catalyst and the efficient separation of photogenerated electron–hole pairs by the novel ternary composite contributed to the enhanced photocatalytic activity.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Chenghong Qiang,Nan Li,Shixiang Zuo,Zhimin Guo,Wei Zhan,Zhengping Li,Jiangquan Ma
Seeking active and low-cost cocatalysts is a vital task for solving the sluggish kinetics of photocatalysis process in environmental management. Herein, we report a novel and high-efficiency crystallized RuTe 2 cocatalyst, and loaded it onto black TiO 2 to form photocatalytic heterostructure (denoted as RuTe 2 /B-TiO 2 ) for diclofenac (DCF) degradation. To the best of our knowledge, the RuTe 2 as a cocatalyst for photocatalysis based on swift electron capture has not been documented yet. The degradation efficiency of DCF over 0.5% RuTe 2 /B-TiO 2 reached 95.2% for 120 min, which is 1.2 times higher than that of pure B-TiO 2 . In addition, the effects of different calcination temperatures, catalyst amounts, DCF concentrations and solution pH of the as-prepared catalysts were also investigated in depth. Spectroscopy/electrochemistry showed that 0.5% RuTe 2 /B-TiO 2 exhibited a narrower band gap, more active sites and better electrical conductivity than pure B-TiO 2 . Experiments with trapping agents have shown that O 2 – was the main active substance under irradiation. Furthermore, intermediates for the photodegradation of DCF were detected by liquid chromatography mass system (LC-MS) and density functional theory (DFT) calculations. Finally, the degradation pathway was rationalized and a possible photocatalytic mechanism for 0.5% RuTe 2 /B-TiO 2 was proposed.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Dajin Liu,Zhilong Han,Xulai Yang,Shijie Cheng,Jia Xie
SiO x is regarded as a promising anode material for the next-generation lithium-ion batteries (LIBs) because of its high theoretical capacity. In order to relieve the volume variation and enhance the electronic and ionic conductivity , a SiO x @TiO 2 @N-doped carbon (NC) composite is prepared using biopolymer chitin as carbon precursor. The TiO 2 coating layer shields the SiO x in the alkaline chitin solution, enabling the homogeneous and stable dispersion of the SiO x during the synthesis process. After emulsion, freeze-drying, and carbonization, the SiO x @TiO 2 @NC composite is obtained. The dual-confinement of TiO 2 and NC effectively buffers the volume variation of SiO x and enhances the electronic/ionic conductivity. The enhanced structural integrity and conductivity guarantee the superior rate capability and the stable long-term cyclability of the SiO x @TiO 2 @NC composite. After 650 cycles at 0.5 and 1 A g −1 , SiO x @TiO 2 @NC maintains reversible capacities of 633 and 540 mA h g −1 , showing capacity retentions of 92.3% and 96.9%, respectively. After 100 cycles at 0.5 C, the assembled SiO x @TiO 2 @NC//LiFePO 4 full cells can retain a discharge capacity of 121 mA h g −1 , maintaining 90% of the third capacity. This work provides a chance for the industrial application of biopolymer chitin in LIBs, and may alleviate the pressure of environmental protection.
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危险品化学品经营许可证（带存储）