FUEL
·
2023
·
IF 7.4
Puxiang Yan,Haiyong Wang,Yuhe Liao,Chenguang Wang
Upgrading biomass to renewable diesel and jet fuels is essential to achieve carbon neutrality. Herein, diesel and jet fuels range alkanes were produced by HAA of 2-methylfuran and furfural over solid acid SO 4 2- /TiO 2 and subsequent HDO over Pd/NbOPO 4 . A series of SO 4 2- /TiO 2 catalysts were synthesized by wetness impregnation to produce C15 fuel precursors. S/Ti-450 with a calcination temperature of 450 °C exhibited the highest activity, affording 97.9 % yield of C15 fuel precursor. Sufficient Brønsted acid sites and moderate Brønsted acid strength are responsible for the super catalytic performance of S/Ti-450. Stability studies demonstrated that S/Ti-450 could be regenerated. Furthermore, the application of S/Ti-450 in the HAA reaction was extended to other carbonyl compounds (e.g., butanal, cyclohexanone and acetone) and high yields of desired fuel precursors were obtained. Finally, C15 fuel precursor was further converted to long-chain alkanes via HDO over Pd/NbOPO 4 , yielding 85.0 % diesel and jet fuels range alkanes.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Guobo Li,Shipeng Ding,Xueyan Hou,Kai Shen,Shule Zhang,Yaping Zhang
Controlling chlorobenzene (CB) and NO x emissions via catalytic oxidation and selective catalytic reduction necessitates high redox performance catalysts, and construction of active centers with multiple adsorption centers towards reactants is prerequisite for developing such catalysts. Herein, the electronic structure and active centers of the PdV/TiO 2 bimetallic catalyst were modulated by Sb modification. The neighboring antimony (Sb) promoted the charge transfer between V and Pd centers, and suppressed the adsorption of SO 2 on active sites, thus accelerating CB/NO x conversion and significantly avoiding the deposition of sulfur species on the active centers, especially the Pd species. The detailed plausible CB/NO x catalytic removal pathway (CB free → CB ads → C 6 H 5 ads + Cl ads + O species (O latt and O ads ) → C x H y O z + Cl ads + Brønsted → CO 2 + H 2 O + HCl on SbPdV/TiO 2 catalyst surface was further established. This research provided a strategy for the development of improved CB catalytic oxidation + selective catalytic reduction (CBCO + SCR) catalysts by tuning the electronic structure of active centers.
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Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Kané Rabé,Lifen Liu,Noor Ahmed Nahyoon,Yizhen Zhang,Ahmed Mahmoud Idris,Jiaqi Sun,Lixin Yuan
We have prepared and studied a novel low cost catalyst of g-C 3 N 4 /Fe 0 (1%)/TiO 2, using a simple process involving the formation of zero valence iron by chemical reduction . This ternary catalyst g-C 3 N 4 /Fe 0 (1%)/TiO 2 was characterized using XRD (X-Ray diffraction), UV–vis spectrum, EDS (Energy Dispersive spectrum) and TEM (transmission electron microscopy), it demonstrated high-visible-light activity in a wide range of pH condition, it can photo-catalytically degraded Rhodamine B (RhB), Tetracycline (TC), and Berberine hydrogen chloride (BH) (∼98% in 90 min) under visible light. The high activity arises from the increased harvest of more visible light and the improved separation of photo-excited electrons and holes via Z-scheme and heterojunctions mechanism. Also, the time required to remove 100% RhB, TC, and 96% BH can be shortened from 90 min to 60 min by introducing 3.18 mM Na 2 SO 3 to this photocatalysis system that assisted the generation of reactive oxidizing species and pollutant degradation. The results showed promising application prospect for this developed catalyst and the tested photocatalysis pollutant degradation system.
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DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 20
·6846-6852
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IF 4.052
Chenle Zhang,Jingbo Yang,Hongwei Mi,Yongliang Li,Peixin Zhang,Han Zhang
Silicon (Si) is an attractive anode material for lithium-ion batteries due to its high gravimetric and volumetric capacity. However, the challenges for Si anodes are low conductivity, unstable solid electrolyte interphase (SEI) layer and big volume expansion during the charge/discharge process. Inspired by the structure of carob, we propose a yolk–shell structured Si anode which tackles all the problems mentioned above. The non-filling Si clusters protected by atomic layer-deposited TiO2 are embedded in highly conductive one-dimensional carbon nanofibers, which leaves enough space for the expansion and contraction of Si during lithiation/delithiation. Moreover, the SEI layer will form at the outer surface of carbon nanofibers instead of on individual Si nanoparticles and can remain stable and spatially confined. Therefore, the yolk–shell composite electrode exhibits good electrochemical performance and reversible capacities of 1156 mA h g−1 at a current density of 600 mA g−1 after 500 cycles and 485 mA h g−1 at the current density of 9600 mA g−1 after 2000 cycles are obtained.
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高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-14
·
IF 4.011
Wang Yizheng,Yu Jiang,Peng Weidong,Tian Jing,Yang Chun
In this paper, we used a facile ball milling, microwave radiation and heating treatment method to achieve the surface modification of TiO 2 with low g-C 3 N 4 concentration, and a multilayer heterojunction composite with TiO 2 as the main part and g-C 3 N 4 as the modification agent was obtained. The obtained materials were analyzed by several characterizations to get information on their chemical composition, crystalline structure, vibrational features and optical properties. The photocatalytic performance was evaluated by degradation of rhodamine B (RhB) and methylene blue (MB) under UV, visible and direct solar light irradiation. Its photocatalytic activity was enhanced depended on the novel structure of g-C 3 N 4 /TiO 2 hybrid and the special Z-scheme electron-hole transfer model of multilayer heterointerfaces. The material preparation and structural features could be useful for the design and development of other photocatalysts with high photocatalytic activity.
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Nanomaterials
·
2019
·Vol. 9
·期 2
·298
·
IF 4.034
Shufang Wu,Xunjun Chen,Minghao Yi,Jianfang Ge,Guoqiang Yin,Xinming Li,Ming He
In this study, feather keratin/polyvinyl alcohol/tris(hydroxymethyl)aminomethane (FK/PVA/Tris) bionanocomposite films containing two types of nanoparticles, namely one-dimensional sodium montmorillonite (MMT) clay platelets (0.5, 1, 3, and 5 wt%) and three-dimensional TiO2nanospheres (0.5, 1, 3, and 5 wt%), are prepared using solvent casting method. X-ray diffraction studies confirm the completely exfoliated structure of FK/PVA/Tris/MMT nanocomposites. The successful formation of new hydrogen bonds between the hydroxyl groups of the film matrix and the nanofillers is confirmed by Fourier transform infrared spectroscopy. The tensile strength, elongation at break, and initial degradation temperature of the films are enhanced after MMT and TiO2incorporation. The water vapor permeability, oxygen permeability, and light transmittance decrease with increase in TiO2and MMT contents. In summary, nanoblending is an effective method to promote the application of FK/PVA/Tris blend films in the packaging field.Keywords:feather keratin;tris(hydroxymethyl)aminomethane;sodium montmorillonite;TiO2;solvent casting;nanocomposite
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 8
·1-9
·
IF 5.479
Kong Weisu,Li Qin,Xia Lian,Li Xiaomeng,Sun Han,Kong Rong-Mei,Qu Fengli
A photoelectrochemical (PEC) method has been developed for sensitive detection of trypsin. It is based on the use of a composite consisting of MoS 2 nanosheets and TiO 2 nanorods (MoS 2 -TiO 2 ). The material has a high specific surface area, superior electrical conductivity, excellent biocompatibility and good band gap matching. The composite was synthesized by a one-pot method using TiO 2 as a template. This results in a uniform distribution of the MoS 2 nanosheets (<5 layers) in the composite. If the composite, placed on an indium tin oxide (ITO) electrode, is coupled to apoferritin, the photocurrent response decreases due to the insulating effect of the protein. Trypsin, in acting as an alkaline protease, decomposes the apoferritin. This results in the recovery of the PEC signal. Attractive features of this PEC method include (a) a superior PEC signal, (b) sensor stability, (c) simple operation, and (d) the lack of any additional modifications of the biosensor. This warrants high sensitivity, reproducibility, repeatability and practicality. The ITO sensor has a linear response in the 1 to 1000 ng·mL −1 trypsin concentration range and a 0.82 ng·mL −1 detection limit. The assay was applied to the determination of trypsin in spiked serum samples and gave satisfactory results.
Schematic presentation of an indium tin oxide (ITO)/MoS 2 -TiO 2 sensor for detecting trypsin. The PEC signal was decreased after immobilization of apoferritin (APO) on the modified ITO. Trypsin catalytically hydrolyzes APO specifically and induces the PEC signal to recover.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xin Jiang,Di Yin,Ming Yang,Juan Du,Weie Wang,Lei Zhang,Libin Yang,Xiaoxia Han,Bing Zhao
The strong interface interaction, especially interfacial charge transfer (CT) behavior, in TiO 2 /reduced graphene oxide (TiO 2 /rGO) nanocomposite endows the advanced hybrid material with extensive availability in dye-sensitized solar cells, photocatalysis , etc. Thus, revealing and understanding of the interfacial CT process are a crucial and interesting issue, owing to its vital contributions to optoelectronic and electronic properties. In this work, the TiO 2 /rGO nanocomposites with anchoring of TiO 2 nanoparticles on rGO nanosheets have been fabricated, and a surface-enhanced Raman scattering (SERS) strategy with 4-mercaptobenzoic acid (4-MBA) as probe was performed to reveal the interfacial CT in the nanocomposites. There are obvious enhancements in the SERS intensity and the degree of CT (ρ CT ) in the 4-MBA/TiO 2 /rGO/4-MBA system compared with those of 4-MBA/TiO 2 and 4-MBA/TiO 2 + rGO/4-MBA (TiO 2 + rGO is a physical mixture of TiO 2 and rGO) due to the chemical interaction and the interfacial CT between TiO 2 and rGO in the nanocomposite. It is indicated that the interfacial chemical interaction in the nanocomposite is an essential requirement for occurrence of the interfacial CT. The interfacial CT process can be evaluated quantitatively by the ρ CT in SERS spectrum. The ρ CT shows an obvious increasing trend with the increase of rGO amount in TiO 2 /rGO nanocomposites, and then reaches a saturation when the amount of rGO is 1.0%. And also, to further understanding of this CT progress, the model of the CT mechanism has been proposed. Furthermore, as-prepared TiO 2 /rGO nanocomposite can also be served as an effective SERS-active substrate for the ultrasensitive detection of analytes. The minimum detectable concentration of 4-MBA on the TiO 2 /rGO substrate can reach to 1 × 10 −7 mol/L, which is comparable to a noble metal substrate. Even, for p -aminothiophenol target molecule whose SERS signals cannot almost be observed on the ordinary TiO 2 substrate, the minimum detectable concentration can reach to a value as low as 1 × 10 −8 mol/L on the TiO 2 /rGO substrate.
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Environmental Science-Nano
·
2019
·Vol. 6
·期 3
·948-958
·
IF 7.704
Weiping Zhang,Guiying Li,Hongli Liu,Jiangyao Chen,Shengtao Ma,Taicheng An
A facile micro/nano-bubble method was firstly applied to synthesize an Au/TiO2@CNT composite photocatalyst for photocatalytic degradation of gaseous styrene. The morphologies, structures and compositions of the photocatalysts were investigated by using a series of analytical techniques (scanning and transmission electron microscopy, FT-IR spectroscopy, Raman spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy). The micro/nano-bubbles can effectively facilitate the reaction of Au and TiO2 NPs decorated onto CNTs, forming a stable ternary composite structure. The photocatalytic performance of Au/TiO2@CNTs was investigated by the methodology of central composite design (CCD) in response surface methodology (RSM). The photocatalytic degradation and mineralization of styrene over Au/TiO2@CNTs drastically increased with the rise of reaction temperature due to the formation of a compact structure. The analysis of EPR, UV-vis DRS, electrochemical properties and TPD-O2 further revealed the enhanced photocatalytic mechanism of Au/TiO2@CNTs. The further identification of free radicals showed that the photocatalytic degradation and mineralization of styrene were closely related to oxidative radicals such as hydroxyl radicals and superoxide radicals, which were mainly attributed to the synergistic effects of Au NPs and CNTs to enhance the photocatalytic activity. This work will provide a new insight into designing photocatalysts with high photocatalytic performance and stability for the degradation of hazardous VOCs.
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CHEMOSPHERE
·
2018
·
IF 4.427
Guanghui Wang,Wenzhe Fan,Qin Li,Nansheng Deng
In this work, aspartic acid-β-cyclodextrin (ACD) was synthesized by the reaction of β-cyclodextrin with aspartic acid and epichlorohydrin, and graphene oxide-TiO 2 (GO-TiO 2 ) composite catalyst was prepared by a hydrothermal method. The complexation of ACD with New Coccine (NC) and Pb 2+ was characterized with FT-IR and XPS, respectively, the results show that ACD can simultaneously complex NC and Pb 2+ . XRD analysis and SEM images of GO-TiO 2 show that TiO 2 platelets are well distributed on both sides of the graphene oxide sheets, and display a similar XRD pattern to the pure TiO 2 nanoparticles with the typical diffraction peak of anatase phase. The effects of ACD on the photocatalytic degradation of NC and photocatalytic reduction of Pb 2+ were investigated in the single pollution system, and the synergistic effects on the simultaneous photocatalytic NC degradation and Pb 2+ reduction in the presence of ACD were also evaluated. The results showed that the presence of ACD was favorable to the acceleration of photocatalytic oxidation of NC and photocatalytic reduction of Pb 2+ in the single pollution system, and the photocatalytic reaction rate constants of NC and Pb 2+ in the presence of ACD increased 58% and 42%, respectively. For the combined pollution system, the synergistic effects on the simultaneous conversion of NC and Pb 2+ in aqueous solutions were also further enhanced. ACD enhanced photocatalytic activity was attributed to the improvement of the electron transfer and mass transfer at the GO-TiO 2 interface.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Hamidreza Abadikhah,Ehsan Naderi Kalali,Samaneh Khodi,Xin Xu,Simeon Agathopoulos
High desalination performance, dye retention, and antibacterial properties were achieved with a multifunctional thin-film nanocomposite (MTFN) membrane, fabricated by the incorporation of a novel nanocomposite structure of reduced graphene oxide@TiO2@Ag (rGO@TiO2@Ag) into the polyamide active layer. The specific characteristics of the graphene-based nanocomposite, synthesized by the microwave-assisted irradiation process, favored water channelization and provided superhydrophilicity and antibacterial properties to the MTFN membranes. In comparison with the conventional methods, such as multistep chemical process using strong agents for reduction and long-term energy-consuming hydrothermal process, microwave irradiation facilitated a green, fast, and cost-effective route for the fabrication of GO-based nanocomposites for multifunctional applications. Interfacial polymerization was performed on a polyethersulfone/Si3N4 robust hollow fiber substrate using m-phenylenediamine aqueous solution and 1,3,5-benzenetricarbonyltrichloride organic solution. The structural and chemical characteristics of the synthesized nanocomposites and the MTFN membranes were thoroughly studied by a series of characterization analyses (transmission electron microscopy, field emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and atomic force microscopy). The physicochemical properties and the nanofiltration performance of the MTFN membranes were investigated after the incorporation of rGO@TiO2@Ag at various concentrations. The water contact angles confirmed the superb surface hydrophilicity of the MTFN membranes. High permeability (52 L·m–2·h–1), desalination (96% for 1 g/L Na2SO4 feed solution), and dye retention (98% for 0.5 g/L rose bengal feed solution) were recorded for MTFN enriched with 0.2 wt % rGO@TiO2@Ag. A 90% reduction in the number of viable bacteria (Escherichia coli), after 3 h of contact with MTFN membranes, confirmed the superior antibacterial activity of the produced membranes.
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POLYMER TESTING
·
2018
·
IF 2.247
Lichun Ma,Yingying Zhu,Xiaoru Li,Chao Yang,Ping Han,Guojun Song
To improve the interfacial properties of carbon fiber (CF)/epoxy composites, the growth of titanium dioxide nanorods (TiO 2 NRs) on CF surface was obtained by hydrothermal and supercritical methods. The microstructures, morphologies and mechanical properties of CF-TiO 2 NRs before and after architecture were investigated, which indicated that TiO 2 NRs were grown uniformly onto CFs. The polarity, roughness and wettability of CF-TiO 2 NRs were increased distinctly in comparison with those of untreated CF, especially in supercritical water, indicating that supercritical water has ameliorated the growth efficiency and promoted the TiO 2 NRs onto the CF surface more compactly. The interfacial shear strength (IFSS) and impact strength of composite could be increased as high as 50.7% and 50.0% without deteriorating fiber tensile strength in supercritical water. Meanwhile, the interfacial reinforcing and toughing mechanisms of hybrid fiber composite have also been elaborated. It is believed that the effective method would offer a novel interface design ideology for developing high performance composites.
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危险品化学品经营许可证（带存储）