Nano-Micro Letters
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2020
·Vol. 12
·期 1
·1-16
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IF 12.264
Deng Baiwen,Xiang Zhen,Xiong Juan,Liu Zhicheng,Yu Lunzhou,Lu Wei
Sandwich-like laminated Fe&TiO 2 @C nanocomposites were successfully prepared from the MXene–MOFs hybrids.
A broad effective bandwidth of 6.5 GHz at a thickness of only 1.6 mm was achieved.
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Catalysts
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2020
·Vol. 10
·期 8
·942
·
IF 3.52
Zhiying Yan,Zijuan He,Mi Li,Lin Zhang,Yao Luo,Jiao He,Yongjuan Chen,Jiaqiang Wang
In order to further improve the photocatalytic performance of the SiO2/TiO2composite under visible light irradiation, curcumin-doped SiO2/TiO2nanocomposites were synthesized via directly incorporating it into the structure of SiO2/TiO2during the synthesis using an inexpensive and readily available natural pigment (curcumin) as doping agent. The physicochemical properties of SiO2/TiO2nanocomposites were characterized in detail by X-ray diffraction, transmission electron microscopy, Fourier transform-infrared spectroscopy, N2adsorption–desorption isotherms, X-ray photoelectron spectroscopy, and UV-vis diffuse reflectance spectroscopy. The results indicate that all SiO2/TiO2nanocomposites exhibited an anatase phase with a typical mesoporous structure. It was found that the dope of curcumin in the SiO2/TiO2composite could decrease the crystal size, slightly improve the specific surface areas, significantly enhance the visible light absorption, and effectively narrow the band gap energy from 3.04 to 10(eV). Compared with bare SiO2/TiO2, the curcumin-doped SiO2/TiO2resulted in enhanced photocatalytic reduction activity for Cr(VI) under visible light irradiation, and the CTS (12) sample with the appropriate content of curcumin of 12 wt % shows the photocatalytic yield reaching 100% within 2.5 hours, which is larger than CT (12) without silica. This could be attributed to the curcumin doping and the synergetic effects of SiO2and TiO2in SiO2/TiO2nanocomposites.Keywords:curcumin pigment;SiO2/TiO2nanocomposites;visible photocatalyst;reduction of Cr (VI)
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NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 36
·15475-15482
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IF 3.288
Xiaoshu Qu,Yu Fu,Chao Ma,Yanyan Yang,Dan Shi,Dongxue Chu,Xiaoyang Yu
Multifunctional electrode materials have been widely studied in recent years, owing to their various excellent performances. Herein, we report a nanocomposite film based on Dawson-type monolacunary polyoxotungtate K10P2W17O61 and TiO2 nanowires fabricated via hydrothermal and layer-by-layer self-assembly combination methods, in which the bifunctional combination of electrochromism energy storage was successfully realized. Compared to individual K10P2W17O61 thin films, the nanocomposite films showed outstanding electrochromic properties of high coloration efficiency (150.34 cm2 C−1 at 600 nm) and cyclic stability, and the volumetric capacitance of the composite film reaches 172.3 F cm−3 with a working voltage window of 1.77 V. The greater electrochemical properties could be due to the unique 3D structure of the TiO2 NW arrays, which provides a larger electrolyte contact area and a shorter ion diffusion pathway available for the redox reactions. Our study provides a new route to design bifunctional electrode materials with enhanced electrochromism and energy storage functions, making polyoxometalate-based electrode materials more attractive for practical applications.
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ANALYTICAL CHEMISTRY
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2020
·
IF 6.785
Yang Si,Ai-Yong Zhang,Chang Liu,Dan-Ni Pei,Han-Qing Yu
Photochemical oxidation is able to effectively regenerate the fouled electrode in electrochemical pollutant monitoring, while its regeneration capacity is limited by the surface-bound hydroxyl radical speciation with low activity and mobility, which is attributed to the dissociated water adsorption on hydrophilic metal oxides. In this work, fluorine-terminated {001}-exposed TiO2 single crystals (F–TiO2) are rationally designed to construct an Au-based electrochemical sensor (Au/F–TiO2) for dopamine (DA) detection in different matrices. The Au/F–TiO2 sensor exhibits an efficient and stable detection capacity in both environmental and biological samples. A superior photochemical regeneration capacity is obtained on the Au/F–TiO2 electrode with much reduced matrix effects under UV irradiation. Spectral observation, crystallographic analysis, pollutant degradation performance, radical inhibition, and surface enhanced Raman scattering tests reveal that both the fluorine-terminated surface chemical features and the bulk-free radical speciation are mainly responsible for the superior photochemical regeneration capacity of the Au/F–TiO2 electrode. Even for the real biological samples, a stable electrochemical DA detection is also achieved on the Au/F–TiO2 sensor. Our work establishes a new approach to refine electrochemical sensors for stable monitoring and provides a robust photoactive electrode substrate with high efficiency and low cost for practical applications.
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Coatings
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2020
·Vol. 10
·期 2
·179
·
IF 2.436
Hui Shu,Ming Yang,Qiang Liu,Maobin Luo
Coating materials can effectively protect stone-built cultural heritage and, as such, research into coating materials has gained comprehensive attention from researchers. The aim of this work is to prepare a TiO2-modified sol coating material (TSCM) and study its protective effects on stone-built cultural heritage. TSCM and pure TiO2sol (p-sol, unmodified; for comparison) were applied evenly over the entire surface of stone samples. The prepared stone samples included untreated stone, stone treated with pure sol, and stone treated with TSCM. The protective effects of TSCM were evaluated by water absorption, water vapor permeability, acid resistance, and weather resistance experiments. The results show that stone treated with TSCM has excellent water absorption and water vapor permeability, strong acid resistance, and good weather resistance, compared with untreated stone or stone treated with p-sol. The acid resistance of stone treated by TSCM was 1.75 times higher than that treated with traditional coating materials. The weather resistance cycle number of stone treated by TSCM was four times higher than that treated with organic protective materials. These findings are expected to provide useful suggestions for the protection of stone-built cultural heritage.Keywords:stone-built cultural heritage protection;TiO2-modified sol;coating material;weather resistance;acid corrosion resistance
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CATALYSIS LETTERS
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2020
·Vol. 150
·期 7
·1890-1897
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IF 2.482
Zhou Na,Yan Ruiyao,Pan Yanlin,Fang Xue-Qian
The fast recombination of photogenerated electrons and holes in the pure TiO 2 leads to a low photocatalytic efficiency in hydrogen generation or solar energy conversion. Noble metal nanoparticles have been used to combine with TiO 2 for effective photocatalysis. Herein, Au@Ag@TiO 2 nanorods (NRs) with core–shell structure have been prepared by hydrolysis the precursor of titanium in acid environment. UV light–driven H 2 generation rate of Au@Ag@TiO 2 samples demonstrated 14 times enhancement compared to P25 TiO 2 at the same experimental conditions. The improved photocatalytic performance was due to the charge transfer from the conduction band of excited TiO 2 to Au@Ag NRs leading to effective separation of electron–hole pairs. This mechanism has been proved by transient absorption spectroscopy and photo-electrochemical (PEC) measurements. The time resolved photocurrents of P25 TiO 2 NPs is ~ 13 times higher that of Au@Ag@TiO 2 , indicating that a fraction of the photogenerated electrons of TiO 2 driven by UV light transfer to Au@Ag nanocores instead of transporting entirely to the ITO substrates. The ultrafast transient absorption and pump-probe measurements demonstrated a faster decay in Au@Ag@TiO 2 NRs compared to pure TiO 2 system, indicating that the photogenerated electron–hole recombination in TiO 2 is substantially suppressed by Au@Ag@TiO 2 NRs attributed to the effective trapping of the photogenerated electrons by the Au@Ag cores. Graphic Abstract Au@Ag@TiO 2 nanocomposites with core-shell structure have been prepared and its UV light–driven H 2 generation rate has been demonstrated 14 times enhancement compared to P25 TiO 2 at the same experimental conditions. The improved photocatalytic performance was due to the charge transfer, which has been proved by photocurrent measurement and the ultrafast transient absorption and pump-probe measurements.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Jingju Cai,Minghua Zhou,Xin Xu,Xuedong Du
Anode materials are crucial to anodic oxidation for wastewater treatment. In this regard, stable boron and cobalt co-doped TiO 2 nanotube (B, Co-TNT) was prepared for the first time, and its lifetime was found increased significantly while electrocatalytic activity decreased with the increase of Co(NO 3 ) 2 in preparation from 1 to 10 mM. Characterized by scanning electron microscope (SEM), X-Ray Diffraction (XRD) and X-ray Photo-electronic Spectroscopy (XPS), B and Co content were optimized and successfully doped on TNT, which was more smooth without ripple with Co content of 0.038 mg/cm 2 in a valence of +2, and B atomic content of 2.17 at.% in form of Ti-B-O. This optimized anode enhanced electrode lifetime 122.8 times while the electrochemical activity decreased slightly when compared to the undoped TNT. The effects of current density, initial pH and initial 2,4-dichlorophenoxyacetic acid (2,4-D) concentration were investigated, and the mainly responsible radical for degradation was confirmed to be the surface OH on B, Co-TNT anode. This anode had better performance on the TOC removal, mineralization current density (MCE) and energy consumption (Ec) when compared with BDD, PbO 2 , DSA and Pt anodes, and it also presented a very stable degradation for 10 cycles oxidation of 20 mg/L 2,4-D with allowable Co leaching. Therefore, B, Co-TNT anode is a promising, stable, safety and cost-effective anode for application in electrochemical advanced oxidation processes (EAOPs).
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CERAMICS INTERNATIONAL
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2020
·
IF 3.83
Zhenyu Tan,Kaixin Song,Hadi Barzegar Bafrooei,Bing Liu,Jun Wu,Junming Xu,Huixing Lin,Dawei Wang
In this paper, thermal stable Y 3 MgAl 3 SibO 12 -TiO 2 microwave composite ceramics were firstly fabricated by the high temperature solid phase reaction method. The influence of the sintering temperature , microstructure on microwave dielectric properties of Y 3 MgAl 3 SiO 12 by doping TiO 2 were investigated in detailed. TiO 2 addition reduced the ceramic sintering temperature and improved the distribution of grain size. The negative temperature coefficient of resonant frequency (τ f = −32 ppm/°C) of Y 3 MgAl 3 SiO 12 was adjusted to near zero value. 0.8Y 3 MgAl 3 SiO 12 -0.2TiO 2 ceramic sintered at 1475 °C for 6 h achieved the optimized microwave dielectric properties: ε r = 12.2, Q × f = 21,050 GHz, τ f = +5.2 ppm/°C, which indicated that 0.8Y 3 MgAl 3 SiO 12 -0.2TiO 2 is a potential candidate for dielectric patch antenna and substrate.
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ChemPhotoChem
·
2020
·Vol. 4
·期 5
·366-372
·
IF 2.838
Yajun Bi,Jiadong Li,Changchang Dong,Wei Mu,Xiaojun Han
Graphical Clean up, clean up : A new heterostructured photocatalyst, MnCo 2 O 4.5 deposited TiO 2 nanotube arrays, was synthesized via a two-step anodization and chemical bath deposition method. The catalyst exhibited enhanced photocatalytic activity in the degradation of tetracycline under visible light irradiation compared with pure TiO 2 nanotube arrays. A novel type of heterostructured photocatalyst, MnCo 2 O 4.5 deposited TiO 2 nanotube arrays (TNAs), was successfully synthesized via a two-step anodization and chemical bath deposition method. The decoration of MnCo 2 O 4.5 nanoparticles on anatase TNAs significantly enhances its photocatalytic degradation activity of tetracycline (TC). The optimized 140MnCo 2 O 4.5 /TiO 2 nanotube arrays (140 M/TNA) catalyst exhibited the highest photocatalytic degradation of TC with an efficiency of 93.1 % after 2 h illumination. Meanwhile, the material showed good stability after a 5 cycle test. The mechanism of increased activity is attributed to the MnCo 2 O 4.5 /TiO 2 heterostructure, which extends the response range to visible light and promotes electron–hole separation. Further radical capture experiment reveals that . O 2 − is vital as an active species for degrading TC in this system. The photocatalyst obtained via this rational synthesis strategy can effectively remove organic pollutants from waste water under visible light irradiation.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Wenliang Feng,Rudi Ruben Maça,Vinodkumar Etacheri
Sodium-ion hybrid capacitors are known for their high power densities and superior cycle life compared to Na-ion batteries. However, low energy densities (<100 Wh kg–1) due to the lack of high-capacity (>150 mAh g–1) anodes capable of fast charging are delaying their practical implementation. Herein, we report a high-performance Na-ion hybrid capacitor based on an interface-engineered hierarchical TiO2 nanosheet anode consisting of bronze (∼15%) and anatase (∼85%) crystallites (∼10 nm). This pseudocapacitive dual-phase anode demonstrated exceptional specific capacity of 289 mAh g–1 at 0.025 A g–1 and excellent rate capability (110 mAh g–1 at 1.0 A g–1). The Na-ion hybrid capacitor integrating a dual-phase hierarchical TiO2 nanosheet anode and an activated carbon cathode exhibited a high energy density of 200 Wh kg–1 (based on the total mass of active materials in both electrodes) and power density of 6191 W kg–1. These values are in the energy and power density range of Li-ion batteries (100–300 Wh kg–1) and supercapacitors (5000–15 000 W kg–1), respectively. Furthermore, exceptional capacity retention of 80% is observed after 5000 charge–discharge cycles. Outstanding electrochemical performance of the demonstrated Na-ion hybrid capacitor is credited to the enhanced pseudocapacitive Na-ion intercalation of the two-dimensional TiO2 anode resulting from nanointerfaces between bronze and anatase crystallites. Mechanistic investigations evidenced Na-ion storage through intercalation pseudocapacitance with minimal structural changes. This approach of nanointerface-induced pseudocapacitance presents great opportunities toward developing advanced electrode materials for next-generation Na-ion hybrid capacitors.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Dandan Cao,Qingyao Wang,Yue Wu,Shuxu Zhu,Yao Jia,Renliang Wang
Bi/Bi 2 MoO 6 /TiO 2 NTs photocatalysts were synthesized on the basis of TiO 2 NTs by a solvothermal method using glucose as the reducing agent. The removal of organic dyes such as RhB and MB and heavy metal ions like Cr(VI) were used to simulate industrial wastewater for the photocatalytic activity assessment of Bi/Bi 2 MoO 6 /TiO 2 NTs. Na 2 S/Na 2 SO 3 solution was used as sacrificial agent to study the photocatalytic hydrogen generation performance of samples. The results showed that Bi 3+ was successfully reduced to metal Bi and deposited on the surface of Bi 2 MoO 6 . The removal efficiencies of RhB, MB and Cr(VI) reached 73.21%, 92.98% and 70.54%, respectively, which confirmed the excellent photocatalytic activity of samples. The photocatalytic hydrogen production performance of the sample was also remarkable and the hydrogen generation rate reached 173.41 μmol·h −1 ·cm −2 . The active species and photocatalytic mechanism of pollutant degradation and hydrogen generation were proposed based on the photoelectrochemical data. The excellent photocatalytic performances of Bi/Bi 2 MoO 6 /TiO 2 NTs will exhibit prospective guidance for the preparation and photocatalytic water splitting of bismuth-based photocatalysts.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2020
·
IF 3.306
Xiangming Fang,Guanhong Lu,Asad Mahmood,Zhihong Tang,Ziwei Liu,Linlin Zhang,Yan Wang,Jing Sun
A novel ternary mica/TiO 2 /Fe 2 O 3 composite pearlescent pigment has been designed for the photocatalytic oxidation of gas-phase acetaldehyde in the application of indoor air purification. The mica/TiO 2 /Fe 2 O 3 -x (MTF-x, x = m Fe2O3 : m TiO2 = 0.5–2: 100) composites were synthesized by a sol-gel assisted hydrothermal method. The MTF-1.5 composite shows optimal photocatalytic performance, which is 1.8 times photodegradation efficiency and 2.2 times CO 2 mineralization efficiency higher than those of pure TiO 2 . The enhanced photocatalytic performance of MTF-x (x = 0.5–2) composites could be associated with enhanced reflectivity of mica, which eventually improved the light absorption properties. Also, the presence of TiO 2 /Fe 2 O 3 heterostructure facilitated charge separation in the MTF ternary composite. Besides, superoxide radical was proven as the decisive active species for the degradation of gaseous acetaldehyde. This work provides a systematic approach to develop a potential multi-functional pearlescent pigment to purify indoor air.
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