JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Hui Li,Zixue Su
In this work, 3D ordered nano-micro hierarchical ammonium oxofluorotitanates are synthesized by in-situ dissolution of anodically grown TiO 2 nanotubes and subsequent hydrolysis of (NH 4 ) 2 TiF 6 in an electrochemical cell via a nonclassical crystallization process by external electric field driven oriented particle attachment. The obtained ammonium oxofluorotitanate products are of mesocrystalline structure consisting of nanocrystalline building units oriented aligned at atomic level. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) characterizations are applied to reveal the morphology, structure and crystal phase of grown samples. By controlling the current density or/and content of ammonium fluoride , it is able to grow well-defined (NH 4 ) 3 TiOF 5 octahedrons and truncated octahedrons, (NH 4 ) 2 TiOF 4 nanorods and NH 4 TiOF 3 disks. The transformation from (NH 4 ) 3 TiOF 5 octahedrons to truncated octahedrons is ascribed to the different ratios of growth rate for {1 1 1} planes and {1 0 0} planes. While the decrease of concentration of ammonium fluoride accounts for the crystal phase changes from (NH 4 ) 3 TiOF 5 to (NH 4 ) 2 TiOF 4 and finally to NH 4 TiOF 3 disks. Upon thermal annealing, all these ammonium oxofluorotitanates could be converted to mesoporous hierarchical anatase TiO 2 retaining their exterior morphology and keeping the orientation ordering of subunit nanoparticles , which could exhibit excellent photocatalytic activity when acting as photocatalyst in the photo-degradation of methylene blue .
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 5
·2667-2676
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IF 2.779
Chen Jiajian,Deng Wei,Ren Yuanyuan,Qu Kexin,Li Guoan
Dielectric capacitor has been rapidly developed in recent years, and the ceramics nanofibers/polymer nanocomposites with improved dielectric properties have huge potential in exploitation and application. In this article, the barium titanate (BT) nanofibers were synthesized by electrospinning and encapsulated by titanium dioxide (TiO 2 ) via sol–gel method to prepare the core–shell structured BT@TiO 2 nanofibers and then utilized to prepare poly(vinylidene fluoride) (PVDF)-based nanocomposites. The study we have performed shows that the dielectric constant of BT@TiO 2 /PVDF composites with 4 vol% fillers increase to 24 at 1 kHz, accompanied with the low dielectric loss of 0.019. The breakdown strength of BT@TiO 2 /PVDF composites achieves 128 kV/mm at the content of 2 vol% BT@TiO 2 nanofibers, which is 150% of PVDF and 170% of BT/PVDF composites with the same content of fillers. Meanwhile, the tensile stress of BT@TiO 2 /PVDF composites also reaches the highest value of 44.01 MPa with 2 vol% fillers. In addition, the initial thermal decomposition temperature decreases with the increasing of BT@TiO 2 nanofibers.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2022
·Vol. 414
·期 6
·2065-2078
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IF 4.478
Ou Panpan,Wu Jiawen,Lin Yu,Tan Xuecai,Wu Yeyu,Chen Zhifan,Wei Fucun,Huang Kejing
Chloramphenicol (CAP) is widely used in the food industry and animal husbandry due to its effective antibiotic effect active against gram-positive and gram-negative microorganisms. However, research shows that it can cause serious adverse reactions and side effects in the human body. In order to effectively monitor the residues of CAP, a novel and simple photoelectrochemical (PEC) sensor for sensitive detection of CAP is fabricated based on M-TiO 2 -CdTe QDs/CdS QDs composite. The results show that the prepared M-TiO 2 not only retains the original morphology and structure of MIL-125(Ti), but also exhibits more abundant pore structure and good photoelectrochemical properties. Compared with M-TiO 2 , the as-prepared M-TiO 2 -CdTe QDs/CdS QDs composite exhibits excellent PEC performances including about ninefold enhancement of photocurrent intensity, which is ascribed to the large surface of M-TiO 2 and the introduction of CdTe QDs and CdS QDs. Based on the selective inhibitory effect of CAP in the photocurrent intensity of the M-TiO 2 -CdTe QDs/CdS QDs PEC system, a novel PEC sensor for CAP concentration determination is constructed. The designed PEC sensor demonstrates a linear range from 1 to 140 nmol L −1 with a detection limit of 0.14 nmol L −1 (S/N = 3). Moreover, the method is applied to real milk samples to quantify the CAP residues with spiked recoveries in the range of 96.3–106%, and the possible detection mechanism of the M-TiO 2 -CdTe QDs/CdS QDs PEC system is also discussed. Graphical abstract
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Ming-Yu Qi,Qiong Lin,Zi-Rong Tang,Yi-Jun Xu
Coupling CO 2 photoreduction with selective organic synthesis offers a promising modus operandi to enable simultaneous utilization of photogenerated electrons and holes to realize solar fuels production and chemicals synthesis. Herein, we report a bifunctional zero-dimensional cadmium sulfide quantum dots-two-dimensional titanium dioxide nanosheets (CdS/TNS) heterostructure for photoredox-catalyzed coupling of C–C bond synthesis via selective oxidation of benzyl alcohol with CO 2 photoreduction to CO under visible light. The compositing heterointerface is beneficial for the adsorption and activation of CO 2 , thereby promoting the photoreduction of CO 2 . Remarkably, the synergistic interaction between CdS and TNS tunes the selectivity of benzyl alcohol oxidation from carbonyl compound to the C–C coupled products. Mechanistic studies unveil that the generation of C–C coupled products processes via key radical •CH(OH)Ph intermediates. Theoretical simulations reveal that the weaker adsorption of •CH(OH)Ph radical over CdS/TNS than bare CdS contributes to the formation of highly selective C–C coupled products. The findings are expected to offer instructive guidance on rationally designing the dual-functional catalysts with efficient photoredox-catalyzed coupling reaction systems for integrating CO 2 reduction with selective organic transformations.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 8
·5886-5898
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IF 2.779
Tong Xingyu,Li Wei,Li Jiaying,Lu Shaowei,Wang Baichen,Ma Keming,Yang Chun,Li Qiuwen
Multi-component composite can effectively improve the electromagnetic interference shielding effectiveness (EMI SE) due to the synergistic effects. Herein, graphene aerogel (GA) provides a three-dimensional network framework and in situ generation of titanium dioxide (TiO 2 ) on its network layer by the sol–gel method. After microwave irradiation reduction, the titanium dioxide/microwave-reduced GA (TiO 2 /MRGA) was immersed in epoxy resin solution and cured to obtain its composite. The existence of the Ti–O–C bond proves the favorable combination of TiO 2 and MRGA. Under electromagnetic radiation, MRGA and TiO 2 generate a synergistic effect to improve the EMI SE of the composite. When the mass ratio of TiO 2 to MRGA is 1.5:1 (2.1 wt%+1.4 wt%), the composite exhibits a maximum EMI SE of 32.5 dB in the X band. Moreover, when the mass ratio of TiO 2 to MRGA is in the range of 1 to 1.8, the average EMI SE of the composites increases by 37% compared with that of the MRGA/Epoxy composite. The research indicates that this kind of EMI shielding composite has enormous application potential.
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CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Yuan Liu,Weiwei Liu,Yang Zhou,Jingbo Chen,Zhiguo Wang,Wen Du,Jianhui Wen,Jun Cao,Dou Zhang
To investigate the influence of modification of ceramic fillers on the dielectric properties of polymer-based composites, TiO 2 and core-shell structured TiO 2 @HfO 2 nanowires were synthesized, and investigated in this study. TiO 2 nanowires/polyvinylidene fluoride (PVDF) and TiO 2 @HfO 2 nanowires/PVDF nanocomposites were prepared using the solution casting method. The experimental results showed that the TiO 2 @HfO 2 nanowires/PVDF composites had improved dielectric properties compared with that of the TiO 2 nanowires/PVDF composites. Owing to the enhanced interfacial polarisation by the multilevel interface, the composites with 10 wt % TiO 2 @HfO 2 nanowires achieved the highest permittivity of 12.56 at 1 kHz, which was enhanced by ∼72% compared to the PVDF matrix. The electric field was evenly distributed by building the fillers with a gradient dielectric constant. The characteristic breakdown strength of the composite with 5 wt % TiO 2 @HfO 2 reached 377.76 kV/mm, compared with that of 334.37 kV/mm for the composite with 5 wt % TiO 2 nanowires. This study initiated a novel strategy for preparing dielectrics with high dielectric constant and improved breakdown strength.
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CHEMOSPHERE
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2022
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IF 8.943
Chen Li,Guoqing Feng,Menghan Sun,Zonglin Pan,Xiaoqing Yan,Xinfei Fan,Chengwen Song,Tonghua Wang
Acidic organic wastewater with toxic and carcinogenic properties has long been a tough problem for industrial treatment. To break down the barrier of poor acidic stability as well as the high cost of materials and reactors, a novel strategy of utilizing a high-performance and acid-tolerant TiO 2 /carbon electrocatalytic membrane (TiO 2 /CEM) for acidic organic wastewater treatment was proposed. Study results showed that high concentrations of organic pollutants were separated and degraded by the synergistic effects of membrane separation and electrocatalytic oxidation simultaneously on the TiO 2 /CEM. The great treatment performance with membrane removal efficiency of >97.4% was obtained by treating acidic rhodamine B (RhB) dye wastewater under optimized applied voltage. Treatment experiments under various pH and electrochemical tests demonstrated the outstanding acid-tolerant property and long service life of TiO 2 /CEM. Furthermore, the feasibility of TiO 2 /CEM for industrial application and various acidic organic wastewater treatment was proved by treating typical organic pollutants (phenol, tetracycline and oil) under high acidic circumstances.
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NANO
·
2022
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IF 1.438
Mengfan Wang,Wenbo Miao,Hongliang Xu,Chaoning Huang,Mingliang Li,Gang Shao,Hailong Wang,Hongxia Lu,Rui Zhang
g–C 3 N 4 nanosheets were first synthesized by calcining the mixture of hydrochloric acid-pretreated melamine and ammonium chloride. Then, by the aiding of solvothermal method and hydrofluoric acid as morphology modifier, 001-TiO 2 /g–C 3 N 4 (TCN-X, X = 5 , 3, 2, 1) nanocomposites were synthesized using g–C 3 N 4 nanosheets and tetrabutyl titanate, with the mass ratio of g–C 3 N 4 to TiO 2 was 5:1, 3:1, 2:1 and 1:1, respectively. The as-synthesized samples were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscopy, Fourier transform infrared spectroscopy, nitrogen adsorption–desorption method, ultraviolet–visible diffuse reflectance spectrum, photoluminescence spectrum, etc. Their photocatalytic properties were evaluated under visible light irradiation with rhodamine B (RhB) as the target pollutant. The results reveal that the TCN-3 composites had a large specific surface area of 67.38 m 2 /g and consisted of g–C 3 N 4 nanosheets and anatase TiO 2 crystals about 10–20 nm in size. The (001) crystal planes of TiO 2 can be easily observed in TCN-X composites. All TiO 2 /g–C 3 N 4 composites exhibited excellent photocatalytic activity compared with the pure g–C 3 N 4 did. The photocatalytic property of TCN-X samples varied with the mass ratio of g–C 3 N 4 to TiO 2 , and TCN-3 presented the optimum photocatalytic performance. In total, 50 mg of TCN-3 completely degraded 50 mL and 100 mL of RhB solution (10 mg/L) in 15 min and 40 min, respectively. The reaction rate constant of TCN-3 was 6.7 times as large as that of pure g–C 3 N 4 . TCN-3 also presented outstanding activity for the photocatalytic degradation of the colorless tetracycline solution. The significant improvement in photocatalytic activity of TCN-3 was attributed to the evenly distribution of TiO 2 on g–C 3 N 4 , the enhanced specific surface area and the construction of 001-TiO 2 /g–C 3 N 4 heterojunction between the g–C 3 N 4 nanosheets and the (001) crystal planes of anatase TiO 2 , which greatly reduced the recombination rate of the photo-generated electron and hole.
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JOURNAL OF SOLID STATE CHEMISTRY
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2021
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IF 3.498
Jun Jiang,Zhidong Chen,Peng Wang,Pei-Yang Gu,Jiadi Liu,Zhuzhu Zhang,Qingfeng Xu
At present, hexavalent chromium (Cr(VI)) has a serious impact on the water environment and human beings since it can be easily absorbed by the human body, lethal to aquatic organisms and carcinogenic to humans. Based on this, a black hollow TiO 2 nanotube supported polydopamine (PDA)@Ag 2 S composite photocatalytic material was prepared, which can be used for the efficient photocatalytic reduction of Cr(VI) in wastewater. Both black hollow TiO 2 and Ag 2 S have the shortcoming of undergoing ready recombination of photogenerated carriers. The introduction of PDA can not only improve the photogeneration of composite photocatalytic materials, but also broaden the absorption range in the visible-light region. A detailed mechanism for the TiO 2-x @PDA@Ag 2 S photocatalytic system has been proposed at the same time. This work provides a new methodology for the design and synthesis of sandwich organic-inorganic hybrid photocatalytic materials.
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Molecular Catalysis
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2021
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IF 5.062
Jing Zhao,Hucheng Zhang,Haiyan Wang,Jianji Wang
A highly attractive aim is to turn CO 2 into useful chemicals selectively and efficiently, but it still retains great challenging to understand the relations between catalytic performances and interface properties. Here, we report an alternative solution to relate the catalytic activity with the strengths of Lewis acids and bases on the Pd-CoO x interfaces. CoO∙TiO 2 /TiO 2 and CoO x /TiO 2 possess the wide spectrum of Lewis acid/base centres, and give the low selectivity and conversion. The introduction of Pd can focus them on the intrinsic centres, and makes Pd-CoO∙TiO 2 /TiO 2 and Pd-CoO x /TiO 2 represent the ideal catalysis. With temperature-programmed desorptions of CO 2 , CO and NH 3 , it is evidenced that the catalytic hydrogenations of CO 2 to CO, CH 4 and CH 3 OH depend on the cooperation of the Lewis acidic/alkaline centres on the interfaces. The studies provide guidelines for rational design and synthesis of heterogeneous catalysts including but not limited to CO 2 hydrogenation.
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APPLIED SURFACE SCIENCE
·
2023
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IF 6.7
Xiaolin Huang,Lianhang Sun,Xing Liu,Min Ge,Bin Zhao,Yibing Bai,Yuning Wang,Shiyan Han,Yudong Li,Youqi Han,Chunlei Zhang
Recombination of photogenerated carriers severely reduces the efficiency of photocatalytic reactions. Herein, Bio-CDs/TiO 2 were produced using the hydrothermal method to tightly load biomass-based carbon dots (Bio-CDs) onto the surface of TiO 2 via Ti-O-C bonds. Finite-difference time-domain (FDTD) simulations showed that the Bio-CDs act as electron storage pools in the Bio-CDs/TiO 2 , enhancing optical absorption and promoting the transfer and storage of photogenerated electrons from TiO 2 to the Bio-CDs, and thus effectively inhibiting the recombination of electron-hole pairs. Photocatalytic hydrogen production by the Bio-CDs/TiO 2 was significantly improved compared with that by pristine TiO 2 (603.92 μmol h −1 g −1 vs 94.18 μmol h −1 g −1 ) and, importantly, the Bio-CDs/TiO 2 performed well over several cycles. Surprisingly, Bio-CDs/TiO 2 also exhibits nice catalytic performance for hydrogen production under the combined action of photoelectricity, and its Tafel slope was significantly lower than that of pristine TiO 2 , which confirmed that the same research potential of Bio-CDs/TiO 2 in the field of photoelectrocatalysis. This work introduces new ways to study the synergistic effects of multiple mechanisms (enhanced optical absorption, increased separation of photogenerated carriers and promotion of transfer and storage of photogenerated electrons) in the enhancement of photocatalytic and photoelectrocatalytic activity of semiconductors by carbon dots.
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2023
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IF 4.1
Jinfeng Zhang,Yuying Zou,Liehai Hu,Yu Zhao,Yueying Fen,Hengyi Xu
BACKGROUND TiO 2 nanoparticles (NPs), a widely used food additive in the food industry, have been shown to aggravate the progress of metabolic diseases. Nanoplastics (NPLs) are an emerging contaminant widely present in the food system and have been shown to induce ovarian disorders in mammals. Noteworthy, they can be ingested by humans through ‘contaminated’ food, whereas the potential toxicity of NPLs and TiO 2 NPs combined remains unclear. In the present study, we investigated the potential effects and mechanisms of co-exposure to polystyrene (PS) NPLs and TiO 2 NPs on the ovary in female mice. RESULTS Our results revealed that the co-exposure of TiO 2 NPs and PS NPLs caused significant injury to ovarian structure and function, but individual exposure had no effect. Moreover, compared to the TiO 2 NPs group, co-exposure aggravated the intestinal barrier damage in mice, increasing the bioaccumulation of TiO 2 NPs in the ovary. After being supplemented with the oxidative stress inhibitor N -acetyl- l -cysteine, the expression of ovarian antioxidant genes increased, and the ovarian structural and functional injury in co-exposure mice reverted to normal levels. CONCLUSION The present study demonstrated that co-exposure to PS NPLs and TiO 2 NPs can cause more severe female reproductive dysfunction and deepens the toxicological insights between NPLs and NPs. © 2023 Society of Chemical Industry.
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