ELECTROCHIMICA ACTA
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2020
·
IF 6.215
Tong Wu,Guiru Sun,Wei Lu,Liping Zhao,Alain Mauger,Christian M. Julien,Liqun Sun,Haiming Xie,Jinghai Liu
The inhibition of the shuttle of lithium polysulfides (LiPSs) and enhancement of the electrical conductivity of the cathodes are desirable to improve the performance of lithium-sulfur batteries. In the present work, we report a cathode acting simultaneously as a highly efficient LiPSs immobilizer and sulfur host. It is composed of sulfur embedded inside a hollow sphere, the shell of which is made of hollow black TiO 2 (b-TiO 2 ) spherical nanoparticles . The particles of the composite are then coated with a polypyrrole (PPy) layer to form the active cathode element (b-TiO 2 /S@PPy). The particular topology of the b-TiO 2 layer provides enough space to alleviate the volume expansion of LiPSs. Equally, the PPy coating layer can not only improve the conductivity of the cathodes, but also restrain the shuttle of LiPSs by chemical adsorption . With the sulfur content of 59.6 wt% corresponding to a sulfur loading of 1.5–1.8 mg cm −2 , the lithium-sulfur batteries with the b-TiO 2 /S@PPy cathode exhibits a high initial discharge capacity (1374 mAh g −1 at 0.1C), a superior cycling stability (910 mAh g −1 after 200 cycles at 0.1C), and a good rate performance (725 mAh g −1 at 2C).
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Ning Liu,Ming Zhu,Niu Niu,Jia Ren,Na Yang,Cong Yu
As an important noninvasive tumor treatment method, phototherapy has drawn extensive research interest. However, the requirements of separate excitation wavelengths, high degree of electron–hole recombination, and low reactive oxygen species (ROS) production capability are still the major barriers. This work reports the construction of a novel nanoplatform: design and synthesis of an aza-BODIPY (AB) probe-decorated mesoporous black titanium dioxide (TiO2) (MT) nanoparticles (NPs) for enhanced photodynamic therapy and photothermal therapy under single-wavelength near-infrared (NIR) laser irradiation for the first time. AB probe-decorated MT NPs (abbreviated as MTAB) were synthesized through the Al reduction of mesoporous anatase TiO2 NPs and subsequent adsorption of the AB probe. The mesoporous structure of MT ensured AB loading capacity and avoided the complicated modification and synthesis processes. Heterogeneous MTAB, which possessed staggered energy levels, were assessed for their capability for effective separation of photogenerated electrons and holes for the first time. Upon NIR laser light irradiation, MTAB exhibited sufficient ROS generation, resulting in distinct tumor cell killing and tumor tissue elimination. This unique heterogeneous nanoplatform with staggered energy levels provides a new strategy to enhance ROS generation and improve the therapeutic efficacy.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Guanghui Wang,Jialing Dai,Qiuyan Luo,Nansheng Deng
In this work, a novel titanium dioxide@aspartic acid-β-cyclodextrin@reduced graphene oxide (TiO 2 @ACD@RGO) composite photocatalyst was successfully synthesized by photochemical method and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform- infrared spectroscopy (FT-IR), Raman spectroscopy, Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA). The photocatalytic degradation behavior of bisphenol A (BPA) was investigated under UV irradiation (λ < 365 nm), the mechanism of photocatalytic degradation of BPA on TiO 2 @ACD@RGO was explained, and the stability and reusability of TiO 2 @ACD@RGO composite was also evaluated. The photocatalytic investigations showed that the TiO 2 @ACD@RGO possessed high photocatalytic efficiency for the degradation of BPA, which was better than that of TiO 2 and TiO 2 @RGO. The reaction constant of TiO 2 @ACD@RGO for BPA was 0.739 mg/L·min, which was 1.34 times of TiO 2 @RGO and 1.87 times of TiO 2 , respectively. The predominant reactive oxygen species for BPA degradation was identified to be the O 2 − and h + . The high photocatalytic activity was attributed to the improvement of the electron transfer and mass transfer at the TiO 2 @ACD@RGO interface. Additionally, the TiO 2 @ACD@RGO presented excellent stability and reusability after five cycles.
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 34
·345603
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IF 3.551
Tao Ke,Shuyi Shen,Kun Yang,Daohui Lin
Constructing effective heterojunctions between semiconductors and appropriate cocatalysts and exposing highly active crystal facets have been considered an effective approach to obtain efficient photocatalysts. Herein, a novel BiOI/(001)TiO2/Ti3C2 (BTT) hybrid was for the first time synthesized by in situ growing (001)TiO2 nanosheets on a 2D MXene nanomaterial (Ti3C2) and subsequent deposition of flower-like nanoflake BiOI on the obtained (001)TiO2/Ti3C2 hybrid. The BTT hybrid exhibited excellent photocatalytic performance for degradation of Rhodamine B under visible light irradiation, with the highest degradation rate being 6.26, 1.72, and 1.35 times of that of a pure BiOI, BiOI/TiO2 hybrid, and BiOI/Ti3C2 hybrid, respectively. The staggeringly enhanced photoactivity of BTT was attributed to the separation of photogenerated carriers by a multiple charge transfer channels because of the formed p-n and Schottky double junctions. This study demonstrates that (001)TiO2/Ti3C2 obtained by simple hydrothermal oxidation of Ti3C2 can be a good cocatalyst for fabricating excellent visible-light-driven photocatalyst.
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Journal of the Taiwan Institute of Chemical Engineers
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2020
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IF 4.794
Siyu Wei,Yingbo Chen,Xiaoyu Hu,Chunhao Wang,Xiujing Huang,Dongqing Liu,Yufeng Zhang
Nanofiltration is widely used in separation of ions with different sizes and charges. However, thin-film composite nanofiltration membrane is hard to reach satisfied selectivity for monovalent ions from divalent ions. In this study, polyamide thin film nanocomposite (TFN) nanofiltration membranes were prepared via interfacial polymerization of piperazine and trimesoyl chloride on a PES substrate by incorporation of aminated titanium dioxide (APTES-TiO 2 ). Surface morphology, roughness of the TFN membranes with varied concentration of aminated TiO 2 were tested by SEM, AFM and Zeta analysis. The results showed membrane containing 0.3(w/v%) amino-modified titanium dioxide with ion-selective properties had greatly improved pure water flux while the Na 2 SO 4 rejection keeps at a relative high level (>95%). For the separation of single salt solution, 0.3(w/v%) TFN has a higher rejection for sodium chloride (23.2%) and sodium sulfate (99.7%). For monovalent/divalent mixed salt solution has a separation factor of 477.89 in terms of chloride ion (Cl − ) and sulfate (SO 4 2− ) in the mixed solution with a salt concentration ratio of 1:19, which was higher than that of the conventional commercial NF membranes, such as Desal-DL, NF 270. This method provides the possibility of recovering concentrated brine and industrial separation of monovalent and divalent ions.
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JOURNAL OF POWER SOURCES
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2020
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IF 8.247
Yunshan Zheng,Fu Chen,Xinling Liu,Xiaoyu Guo,Ye Ying,Yiping Wu,Ying Wen,Haifeng Yang
Rational design of the durable catalysts is an important issue for improving the application performance of synthesized electrocatalysts for methanol oxidation reaction (MOR). In this work, mesoporous Pd 6 Ru 4 /TiO 2-1 composite catalyst is prepared by using two-step reaction. Compared with 20%Pd/C, PdRu, Ru/TiO 2-1 , and Pd/TiO 2-1 catalysts, Pd 6 Ru 4 /TiO 2-1 catalyst has several merits of abundant electrochemical surface areas, excellent electrocatalytic activity and long-term-use stability. Ru doping into Pd/TiO 2-1 greatly optimizes the electronic structure of Pd by decreasing its electron density. Pd 6 Ru 4 /TiO 2-1 also exhibits high turnover number (TON), low activation energy ( ΔEa ) values for MOR, and higher tolerance to CO-poisoning. A satisfactory level of methanol conversion to the final products is validated by chromatographic results. Density functional theory (DFT) calculation could deepen the understanding of excellent tolerance to CO-poisoning.
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RSC Advances
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2020
·Vol. 10
·期 28
·16776-16782
·
IF 3.119
Guo-Min Liu,Wen-Yuan Jia,Qiu-Shi Jiang,Zhi-Qiang Cheng
Exploiting photocatalysts with characteristics of low cost, high reactivity and good recyclability is a great significance for environmental remediation and energy conversion. Herein, hollow TiO2 nanotubes were fabricated by a novel and efficient method via electrospinning and an impregnation calcination method. With the hydrothermal method, the CdS nanoparticles were modified on the surface and in walls of the TiO2 nanotubes. By changing the reaction conditions, the morphology of CdS nanoparticles presents a controllable three-dimensional (3D) structure. The morphology of the samples was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The structure and components of samples were characterized by X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX) and X-ray photoelectron spectroscopy (XPS). The light absorption efficiency was detected using UV-vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL). The photocatalytic properties were evaluated by degradation of methyl orange (MO) and photocatalytic hydrogen evolution under visible light irradiation. From the results, the TiO2/CdS nanotubes exhibit better photocatalytic activity than the pure TiO2. The synthetic mechanism of TiO2/CdS heterostructures and a possible photocatalytic mechanism based on the experimental results were proposed.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Yutang Kang,Shihui Jiao,Yue Zhao,Boran Wang,Zhenwei Zhang,Wen Yin,Yumei Tan,Guangsheng Pang
Both high permeability and high selectivity are advantageous for separation membrane materials. It is a huge challenge to fabricate a membrane that simultaneously possesses both high permeability and high rejection. Here, we fabricated a TiO 2 nanofibers ultrafiltration membrane by depositing hydrogen titanate nanofibers on a porous titanium substrate and sintering at 450 °C. The porous titanium supported TiO 2 nanofibers ultrafiltration membrane has a superhydrophilic separation layer and a high pure water flux of 940 L m −2 h −1 bar −1 . The average pore size of the TiO 2 nanofibers ultrafiltration membrane is 14 nm. The nanoparticles that particle size is smaller than pore size of TiO 2 nanofibers ultrafiltration membrane such as Bovine serum albumin (BSA, 11 nm) and 3 nm TiO 2 nanoparticles can be rejected with high permeation flux and high rejection efficiency. The obtained ultrafiltration membrane exhibits excellent antifouling property, the flux recovery ratio reaches to 97%. Also, the fouling of the TiO 2 nanofibers ultrafiltration membrane can be removed by heating treatment, the permeation flux of the membrane can be easily recovered.
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CHINESE JOURNAL OF CATALYSIS
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2020
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IF 6.146
He Ma,Changhua Wang,Songmei Li,Xintong Zhang,Yichun Liu
Semiconductor oxides are widely used to achieve photocatalytic removal of NO x (NO and NO 2 ) species. These materials also exhibit enhanced oxidation ability in thermally assisted photocatalysis ; however, many of them tend to be deactivated at high relative humidity (RH) levels. In the case of the benchmark P25 TiO 2 photocatalyst, we observe a significant decrease in non-NO 2 selectivity from 95.02% to 58.33% when RH increases from 20% to 80%. Interestingly, the porous TiO 2 (B) microspheres synthesized in this work exhibit 99% selectivity at 20% RH; the selectivity remains as high as 96.18% at 80% RH. The high humidity tolerance of the TiO 2 (B) sample can be ascribed to its strong water desorption capacity and easy O 2 adsorption at elevated temperatures, which reflects the fact that the superoxide radical is the main active species for the deep oxidation of NO x . This work may inspire the design of efficient photothermal catalysts with application in NO x removal in hot and humid environments.
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Nanomaterials
·
2020
·Vol. 10
·期 4
·805
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IF 4.324
Bo Zhang,Xiangfeng Peng,Zhao Wang
Composites of g-C3N4/TiO2were one-step prepared using electron impact with dielectric barrier discharge (DBD) plasma as the electron source. Due to the low operation temperature, TiO2by the plasma method shows higher specific surface area and smaller particle size than that prepared via conventional calcination. Most interestingly, electron impact produces more oxygen vacancy on TiO2, which facilitates the recombination and formation of heterostructure of g-C3N4/TiO2. The composites have higher light absorption capacity and lower charge recombination efficiency. g-C3N4/TiO2by plasma can produce hydrogen at a rate of 219.9 μmol·g−1·h−1and completely degrade Rhodamine B (20mg·L−1) in two hours. Its hydrogen production rates were 3 and 1.5 times higher than that by calcination and pure g-C3N4, respectively. Electron impact, ozone and oxygen radical also play key roles in plasma preparation. Plasma has unique advantages in metal oxides defect engineering and the preparation of heterostructured composites with prospective applications as photocatalysts for pollutant degradation and water splitting.Keywords:dielectric barrier discharge plasma;oxygen vacancy;g-C3N4/TiO2;photodegradation;H2evolution
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SEPARATION SCIENCE AND TECHNOLOGY
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2019
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IF 1.354
Airong Li,Dan Luo,Lele Jiang,Jie Wang,Yi Zhou
A series of experiments on CO2 hydrate formation were carried out in the presence of titanium dioxide (TiO2), silicon dioxide (SiO2), multi-walled carbon nanotubes (MWNTs) nanoparticles. The effects of these nanoparticles on induction time, final gas consumption, and gas storage capacity have been investigated at the temperature of 274.15 K and the initial pressure of 5.0 MPa.g. The induction time of CO2 hydrate formation was remarkably shortened to 12.5 min in the presence of 0.005 wt% MWNTs nanoparticles. The high thermal conductivity and heat capacity of MWNTs nanoparticles presented better heat transfer, and large surface area provided more suitable sites for heterogeneous nucleation of CO2 hydrate.
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ACS Omega
·
2019
·
IF 2.584
Shuaishuai Ma,Jiandong Gu,Yingxia Han,Yuan Gao,Yuqing Zong,Zhaolian Ye,Jinjuan Xue
Visible-lightdriven C–TiO2 nanocomposites were prepared via a simple calcination and acid etching process. The C–TiO2 nanocomposites were characterized by X-ray photoelectron spectroscopy, Raman spectroscopy, X-ray diffraction, transmission electron microscopy, and high-resolution TEM. The results showed that TiO2 nanoparticles were combined with a porous carbon layer through surface C–O groups, which facilitates the strong interface interaction. The interface combination of nano-TiO2 and carbon material increases the specific surface area of nano-TiO2, widens the range of light response, and improves the efficiency of light-induced electron migration. The visible-light photocatalytic activity of the prepared photocatalyst was evaluated by the decomposition of tetracycline aqueous solution. Compared with that of pure TiO2, the photocatalytic activity of C–TiO2 nanocomposites was significantly improved. Furthermore, a possible photocatalytic mechanism was also tentatively proposed. This work can promote the development of active photocatalysts under solar light for the photodegradation of environmental pollutants.
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