Catalysts
·
2022
·Vol. 12
·期 9
·955
·
IF 4.501
Beilei Cui,Hua Wang,Qingfeng Ge,Xinli Zhu
A series of rutile TiO2-supported Ni catalysts with varying Ni sizes were prepared and reduced at 650 °C to explore the effect of Ni size on the strong metal–support interactions (SMSI) and its consequences on the hydrodeoxygenation (HDO) of m-cresol at 350 °C and atmospheric pressure. When the Ni size increases from 4 to 29.1 nm, the SMSI becomes stronger, e.g., the thickness of the TiOxoverlayer and the coverage extent of TiOxon the Ni particle surface increase. Direct deoxygenation to toluene is the dominant pathway on Ni/TiO2catalysts with varying Ni loadings, with almost no CH4being formed. These results indicate that the TiOxoverlayer significantly alters the property of Ni. That is, the C-C hydrogenolysis activity on bare Ni is completely inhibited due to SMSI, while the deoxygenation activity is improved at the Ni-TiOxinterfacial perimeter sites. Meanwhile, the turnover frequency of HDO on small Ni particles of 4 nm is > 2 times higher than that on large Ni particles of 29.1 nm, indicating that the small Ni particle with moderate SMSI appears to be optimal for the direct deoxygenation of m-cresol to toluene. The results suggest HDO activity may be enhanced by tuning the metal particle size and SMSI degree.Keywords:Ni/TiO2;rutile;strong metal-support interactions;m-cresol;hydrodeoxygenation
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Journal of Physical Chemistry C
·
2022
·
IF 4.177
Tongxin Xiao,Ying Chen,Yuning Liang
The photocatalytic conversion of CO2 into hydrocarbon fuels by utilizing abundant solar energy is a promising and eco-friendly approach to address the energy crisis and global warming. In this work, the sensitizer Ni(II) tetra(4-carboxylphenyl)porphyrin (NiTCPP) was successfully combined with TiO2 nanotube arrays (TiO2NTs) by three methods, and their performances in the photocatalytic reduction of CO2 under simulated solar irradiation were studied. The results showed that NiTCPP/TiO2NTs exhibit a greatly ameliorated photocatalytic activity, and the photocatalytic reduction activities of NiTCPP/TiO2NTs prepared by different methods were different. The catalyst prepared by the impregnation method displayed the highest photoreduction efficiency. The reduction rate of CO2 into CH4 was up to 33.89 μmol/cm2/h with a quantum efficiency of 0.65% (at 420 nm), about 5 times that of the bare TiO2NTs. The introduction of NiTCPP not only efficiently expands the light absorption range but also enhances the charge separation efficiency. Furthermore, a possible mechanism of its CO2 photoreduction performances was systematically presented.
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iScience
·
2025
·
IF 4.1
Hong Qian,Binxia Yuan,Yuhao Liu,Li Wang,Rui Zhu,Pengyu Dong
TiO 2 has low photocatalytic activity due to its easy recombination of photogenerated charges and low visible light utilization efficiency. This study utilized the keto-enol tautomerism principle of fructose in an alkaline environment to successfully obtain Cu 2 O/TiO 2 (CT), Cu 2 O/TiO 2 /Cu (CTC), and TiO 2 /Cu (TC) catalysts. As Cu(I) transformed into Cu(0), the bandgap narrowed, significantly enhancing visible light absorption. Photocatalytic tests showed that CT-0.15 exhibited the highest hydrogen production rate (279.53 μmol g −1 h −1 ), which was 25.18 times higher than that of TC-2. However, CTC-1 had the highest CO production rate (10.58 μmol g −1 h −1 ). Optoelectronic test revealed that CT-0.15 and CTC-1 had higher separation efficiency of photogenerated exciton. Density functional theory (DFT) calculations indicated that the change in the valence state of Cu influenced the reaction mechanism, with CT being favorable for the adsorption of H + in HER and CTC promoting the adsorption of CO 2 in carbon dioxide reduction reaction (CO2RR).
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PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2025
·
IF 5.7
Jiazhuang Chen,Yonglian Zhang,Yingjie Guo,Zan Chen,Cuijia Duan,Claudia Li,Sibudjing Kawi,Yinhui Li
To address the low visible-light absorption of titanium oxide (TiO 2 ) and the agglomeration tendency of covalent-organic-framework (COF), UiO-66 modified by amination was combined with acyl chloride covalent organic framework (AC COF) synthesized by ultrasonic assisted method to successfully form AC COF@UiO-66 core-shell structure. Subsequent TiO 2 loading formed a heterojunction that narrows the band gap, suppresses charge recombination, and extends visible-light absorption. Compared to AC COF, the adsorption performance of the TiO 2 /AC COF@UiO-66 increased by 7.4 times, reaching 432.9 mg/g. The active species that play a main part in the photocatalytic degradation process are h + and ·OH. Experimental results demonstrate that tetracycline (TC) can be entirely degraded within 40 min. In this work, the functional design of adsorption and photocatalysis was carried out on UiO-66 framework material, which overcame the limitations of individual component in the treatment of tetracycline wastewater and provided a new strategy for the design of ternary composite photocatalytic materials.
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Materials Today Bio
·
2026
·
IF 11
Chongqing Yu,Zujiang Liu,Jin Ye,Ruixin Zhang,Min Ren,Fulin Deng,Anning Zhao,Ali Abou-Hassan,Yichun Wang,Yao Zhang,Valentim A.R. Barão,Liqun Xu,Jie Xu,Xi Rao
Visible-light-driven antibacterial photocatalysis holds great promise for infected wound management; however, efficient and biologically compatible heterointerfaces remain limited. Here, we constructed a graphdiyne-enabled TiO 2 /g-C 3 N 4 based bio-heterojunction (TCN/GDY) by growing graphdiyne (GDY) onto a TiO 2 /g-C 3 N 4 scaffold, which couples enhanced visible-light harvesting with antibacterial wound therapy. Structural characterization, photoelectrochemical measurements, valence band analysis, in situ XPS, electron paramagnetic resonance, and density functional theory support interfacial electronic coupling, an enhanced photoresponse, and reactive oxygen species generation. These observations are consistent with a proposed dual S-scheme like mechanism. Under 420 nm LED irradiation, TCN/GDY achieved >99% elimination of Escherichia coli , 99.40 ± 0.34% elimination of Staphylococcus aureus , and 98.65 ± 0.74% elimination of methicillin-resistant S. aureus ( MRSA ), and reduced retained crystal-violet-stained MRSA biofilm biomass by 78.57 ± 2.38% under the tested treatment and washing conditions. Multi-omics analysis identified treatment associated changes in central metabolism and nutrient transport. In an MRSA -infected mouse wound model, visible-light-activated TCN/GDY reduced the bacterial burden by 97.98 ± 1.04% and decreased the residual wound area to 2.93 ± 1.46% by day 11. This study establishes a graphdiyne-enabled TiO 2 /g-C 3 N 4 -based bio-heterojunction as a visible-light antibacterial photocatalytic platform for infected wound healing.
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Catalysts
·
2020
·Vol. 10
·期 5
·575
·
IF 3.52
Luqian Zhang,Chen Wang,Jing Sun,Zhengkai An
Benzene is a typical volatile organic compound (VOC) and is found widely in industrial waste gases. In this study, trimesoyl chloride-melamine copolymer (TMP)-TiO2nanocomposites with excellent photocatalytic efficiency in visible-light degradation of gas-phase benzene were synthesized via an in situ hydrothermal synthesis. The optimal conditions for TMP-TiO2nanocomposite synthesis were determined by orthogonal experiments. The structural, physiochemical, and optoelectronic properties of the samples were studied by various analytical techniques. Ultraviolet-visible diffuse reflectance spectroscopy and surface photovoltage spectra showed that the positions of the light-absorbance edges of the TMP-TiO2nanocomposites were sharply red-shifted to the visible region relative to those of unmodified TiO2. The most efficient TMP-TiO2nanocomposite was used for photocatalytic oxidative degradation of gas-phase benzene (initial concentration 230 mg m−3) under visible-light irradiation (380–800 nm); the degradation rate was 100% within 180 min. Under the same reaction conditions, the degradation rates of unmodified TiO2(hydrothermally synthesized TiO2) and commercial material Degussa P25 were 19% and 23.6%, respectively. This is because the Ti–O–N and Ti–O–C bonds in TMP-modified TiO2reduce the band gap of TMP-TiO2. The amide bonds in the TMP decrease the TiO2nanoparticle size and thus increased the specific surface area. The conjugated structures in the TMP provide abundant active sites for trapping photogenerated electrons and promote the separation and transfer of photogenerated electrons and holes.Keywords:TiO2;visible light;volatile organic compound;benzene;gas degradation
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Materials
·
2022
·Vol. 15
·期 6
·2049
·
IF 3.748
Xiaojian Zhou,Xiaozhen Zhang,Chunhai Zou,Renhua Chen,Lanlan Cheng,Botao Han,Huafeng Liu
Rutile TiO2pigments codoped with chromophore ion Cr3+and various charge-balancing ions (i.e., counterions species of Sb, Nb, W and Mo) were prepared by a solid-phase reaction method. The effects of the counterions and calcination temperatures on the phase structure, color-rendering and spectroscopic properties, microstructure, and stability of the synthesized pigments were investigated in detail. The results showed that the introduction of 5–10% counterions improved the solubility of Cr3+in the TiO2lattice to form the single-phase rutile pigments calcined at 1100 °C for 2 h. The 10% Cr-doped pigment showed a dark brown color. Depending on the content and type of counterions, the color of the codoped pigments was tailored from yellow to reddish or yellowish-orange to black with different brightness and hue. The influence mechanism of counterions was ascribed to the lattice distortion and variation in the charge balance condition. It was found that the addition of Sb, Nb, or Mo resulted in a remarkable improvement in the NIR reflectance of pigments. The grain growth was inhibited with the codoping of Cr/Sb and Cr/Nb to achieve the nano-sized pigments. In addition, the prepared pigments exhibited good acid and alkali corrosion resistance as well as excellent stability and coloring performance in transparent ceramic glazes.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 9
·5404-5416
·
IF 2.599
Yang Guohong,Su Jiafei,Guo Yaping,Xu He,Ke Qinfei
Nanotitanium dioxide (TiO 2 )-based materials have attracted an increasing attention in the application of photocatalysis degradation. In this work, a composite TiO 2 /PI membrane constructed with anatase TiO 2 and PI nanofibers in an interwoven structure was successfully fabricated by simultaneous electrospinning with a post-annealing process. The results showed that the TiO 2 nanofibers endowed the composite membrane with photocatalytic activity, while the PI nanofibers as the structural reinforcements in the composite membrane could remarkably improve the mechanical property of membrane. Most importantly, the photocatalytic activities and mechanical properties of composite membranes could be further tuned by controlling the TiO 2 /PI mass ratio. Our study indicated that the combination of TiO 2 and PI nanofibers via simultaneous electrospinning with a post-annealing process offers a new strategy to construct advanced nano-TiO 2 -based materials, which shows a great potential in the application of photocatalytic degradation of toluene.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yue Du,Jiacheng Hu,Yongxu Jin,Yisi Liu,Qiyun Pan,Kai Wang,Lina Zhou,Zhenhui Liu,Xiaodi Du
The development of fast and high yield route for large scale synthesis porous TiO 2 based catalyst has attracted widespread concern in the field of optoelectronic and catalysis. Up to now, the facile synthesis of mesoporous TiO 2 based composite is still limited to wet chemical synthesis approach (hydrothermal, phase transformation, or sol-gel method etc.). Here, we develop a polyethyleneimine-assisted solvent-free strategy to synthesize of ionic liquid-derived Mo-based mesoporous TiO 2 composite, with molybdenum sites uniformly distributed on TiO 2 matrix. As-synthesized ionic liquid-derived mesoporous MoO x /TiO 2 composite is composed of uniform nano-sized anatase particles and connected by worm-like mesoporous channel. Moreover, the calcination conditions and loading amount of molybdenum-containing ionic liquid have been further optimized. These distinct characteristics endow the prospective MoO x /TiO 2 composite with excellent performance in catalytic oxidation reaction, which can remove refractory organic sulfur compound in the model fuel effectively. Our work opens a new solvent-free avenue to synthesis porous metal based ionic liquids/TiO 2 composite.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Liying Wei,Xiaokun Li,Suxiang Feng
In this paper, a CdSe quantum dots (QDs) sensitized TiO 2 photoanode was synthesized by molten-salt-assisted self-assembly (MASA) on a fluorine-doped tin oxide (FTO)-coated glass (CdSe QDs-TiO 2 /FTO), and an efficient photoelectrochemical (PEC) sensor was constructed for the sensitive detection of rutin. CdSe can transfer photo-excited electrons to the conduction band of TiO 2 , thus enhancing the photoelectric activity of TiO 2 . The experimental results show that the PEC sensor has excellent selectivity, good stability, and a wide linear response range for rutin of 0.025–50.0 μM with a low detection limit of 0.007 μΜ. Moreover, the PEC sensor was successfully applied to the detection of rutin content in serum sample.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2018
·
IF 6.653
Ming Lei,Shun Guo,Zhiying Wang,Lihua Zhu,Heqing Tang
Fast and deep debromination of polybrominated diphenyl ethers (PBDEs) under mild conditions is a challenge in the field of pollution control. A strategy was developed to achieve it by exploiting Cu/TiO2 composites as a noble-metal-free catalyst. Toward the debromination of 2,2′,4,4′-tetrabromodiphenyl ether (BDE47) as a typical PBDE, the use of Cu/TiO2 as a catalyst and hydrazine hydrate (N2H4·H2O) as a reducing agent yielded a degradation removal of 100% and a debromination efficiency of 87.7% in 3 s. A complete debromination of BDE47 at 1500 mg L–1 was possible by successively adding N2H4·H2O. A debromination pathway involving active H atom species was proposed for the catalytic transfer hydrogenation (CTH) of PBDEs according to the identified degradation intermediates. A mechanism was further clarified by density functional theory calculations: electrons are delivered from N2H4·H2O to the metallic Cu atom via a coordination of N in N2H4·H2O with Cu atoms. The electron-trapped Cu atom interacts with adsorbed BDE47 to form a transition complex, and then the debromination of this complex occurs on the surface of Cu nanoparticles due to the hydrogen donation of N2H4·H2O through the CTH process. The new method provides a highly efficient method to remove brominated pollutants.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Fei Dou,Liyi Shi,Pingan Song,Guorong Chen,Juan An,Hongjiang Liu,Dengsong Zhang
Silicon monoxide (SiO) has emerged as one promising anode material for lithium-ion battery owing to its high theoretical capacity and relatively small volume change compared with silicon based anode. However, poor conductivity extremely restricts its specific capacity and cycling stability of SiO, C-SiO is most considered to be addressed this issue. Despite that, the effect of the orderly arrangements of carbon coatings on the overall electrochemical performance of SiO anode remains unclear. It is more important to explore the structure of carbon coatings on the electrochemical properties of silicon based anode. Herein, we have much improved orderly array of carbon coatings for C-SiO by introducing 3% TiO 2 , and evidenced by Raman spectroscopy and HRTEM. The electrochemical results show that the TC-SiO with 3% TiO 2 exhibits striking advantages in cycling stability, high rate charge/discharge and interfacial stability properties compared with C-SiO with disorder carbon coatings. This work provides a new strategy for further improving conductivity and interfacial stability of C-Si based anode materials.
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