Polymers
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2020
·Vol. 13
·期 1
·105
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IF 3.426
Da Shen,Qilong Zhang,Zhao Zhang,Hui Yang,Jiansong Sheng
In this research, we designed a feasible method to prepare composite films with high permittivity and significantly enhanced hydrophobic performance, which showed huge potential in the electrowetting field. TiO2nanowire arrays were prepared by a one-step hydrothermal process, and poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) was spin-coated on the nanowire arrays to form composite, the surface of which was modified by electrospinning. Due to the great orientation of TiO2nanowires, dipoles and space charges are in ordered arrangement along the electric field, and this strongly reinforced the Maxwell–Wagner–Sillars (MWS) polarization, thus the permittivity of the composite (TiO2nanowire length/film thickness is 0.769) reaches 53 at 1 kHz, which is nearly 3 times higher than pure P(VDF-TrFE). Meanwhile the composite film possesses low dielectric loss (0.07) and low conductivity (2.69 × 10−9S/cm), showing good insulation. The contact angle of the composite after electrospinning (about 137°) was greatly enhanced from pure P(VDF-TrFE) spin-coated film (about 89°), which can be attributed to the microrough structure built by P(VDF-TrFE) nanofibers.Keywords:TiO2nanowire arrays;poly(vinylidene fluoride-trifluoroethylene);electrospinning;high permittivity;high contact angle
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MATERIALS & DESIGN
·
2020
·
IF 6.289
Changjiang Pan,Tingting Liu,Ya Yang,Tao Liu,Zhihao Gong,Yanchun Wei,Li Quan,Zhongmei Yang,Sen Liu
Osteogenic and antibacterial activities are two basic requirements for orthopedic implants. The present study mainly focused on the investigation of the osteoblast behaviors and antibacterial activities of Sr/Ag-incorporated titanium dioxide (TiO 2 ) nanotube array (TNT) on the titanium surface. To this end, the Sr-incorporated TNT was firstly fabricated on the titanium surface by electrochemical anodization and hydrothermal treatment, and then Ag nanoparticles (AgNPs) were incorporated onto the nanotubes by reduction of the adsorbed Ag + through ultraviolet (UV) irradiation. The TiO 2 nanotubes had excellent hydrophilicity and Sr incorporation can further enhance the hydrophilicity; however, the AgNPs loading could slightly increase water contact angle. The release of Sr 2+ can not only promote osteoblast adhesion, proliferation and mineralization, but also up-regulate the alkaline phosphatase (ALP) and osteocalcin (OCN) expression. The introduction of AgNPs on Sr-incorporated nanotubes did not significantly influence the osteoblast cell behaviors; however, it can effectively inhibit the adhesion and growth of Escherichia coli . Therefore, the method of the present study is expected to be suitable for surface modification of titanium surface to simultaneously enhance the osteo-bonding ability and antibacterial activities for bone repair.
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ENERGY & FUELS
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2020
·
IF 3.421
Wanxian Cai,Yanqi Lv,Koucheng Chen,Zhaobin Zhang,Yuanzeng Jin,Xingfu Zhou
Recently, carbon-based all-inorganic perovskite solar cells (PSCs) caught the attention of photovoltaic researchers due to their remarkable stability. Herein, we report a carbon-based all-inorganic CsPbI2Br PSC using TiO2 nanorod arrays (TiO2 NRAs) as an electron transporting layer. The method of using TiO2 NRAs as an electron pathway has the advantage of increasing the electron–hole separation effectively and enables a thicker active perovskite layer to obtain a stronger absorbance. In addition, a water–alcohol soluble CsCl was used to modify the interface between TiO2 NRAs and the CsPbI2Br active layer to reduce interfacial recombination of charge carriers in the cells, and the CsCl interface-modified device showed a 10.6% increase in the open-circuit voltage. An optimized power conversion efficiency of 11.45% has been obtained, which is one of the superior performances reported for the carbon-based pure CsPbI2Br PSCs to date.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Jinhui Yang,Xiaogang Luo
Photocatalytic degradation is a promising method to solve the problem of ceftriaxone sodium wastewater. In this paper, Ag/TiO 2 @C composite materials with different Ag molar contents, where cellulose-derived carbon beads used as the carrier, were successfully prepared by the One-Pot method. In Ag/TiO 2 @C composite photocatalyst, Ag nanoparticles were deposited on TiO 2 particles to form a metal-semiconductor structure, where charge carriers were effectively separated under the Surface Plasmon Resonance effect of Ag nanoparticles, thereby extending the lifetime of charge carriers. Ag/TiO 2 @C has been found of higher photocatalytic degradation performance compared to pure TiO 2 and pure carbon beads. Among all, Ag (0.5%)/TiO 2 @C has the best catalytic performance. According to the Langmuir-Hinshelwood model, the photodegradation rate followed first-order kinetics, with the highest apparent rate of 0.0091 min −1 . According to the results of mass spectrometry, ceftriaxone sodium was degraded into small molecules and eventually degraded into CO 2 , H 2 O, and we proposed possible pathways and photocatalytic mechanism accordingly.
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RSC Advances
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2020
·Vol. 10
·期 70
·42860-42873
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IF 3.119
Yue Jian,Huayang Liu,Jiaming Zhu,Yaqiong Zeng,Zuohua Liu,Chentao Hou,Shihua Pu
The anatase type cluster TiO2-{001/101} was rapidly generated by a one-step hydrothermal method. The transformation process of coral-like TiOF2 nanoparticles to cluster TiO2-{001/101} was investigated for the first time, and the sensitization between cluster TiO2-{001/101} and tetracycline hydrochloride (TCH) was also discussed. The degradation rate of TCH by cluster TiO2-{001/101} under simulated sunlight was 92.3%, and the total removal rate was 1.76 times that of P25. Besides, cluster TiO2-{001/101} settles more easily than P25 in deionized water. The study showed that cluster TiO2-{001/101} derived from coral-like TiOF2 nanoparticles had a strong adsorption effect on TCH, which was attributed to the oxygen vacancy (Ov) and {001} facets of cluster TiO2-{001/101}. The strong adsorption effect promoted the sensitization between cluster TiO2-{001/101} and TCH, and widened the visible light absorption range of cluster TiO2-{001/101}. In addition, the fluorescence emission spectrum showed that cluster TiO2-{001/101} had a lower luminous intensity, which was attributed to the heterojunction formed by {001} facets and {101} facets that reduces the recombination rate of carriers. It should be noted that cluster TiO2-{001/101} still has good degradation performance for TCH after five cycles of degradation. This study provides a new idea for the synthesis of cluster TiO2-{001/101} with high photocatalytic performance for the treatment of TCH wastewater.
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CATALYSIS LETTERS
·
2020
·Vol. 151
·期 6
·1755-1765
·
IF 2.482
Meng Fanyu,Zhang Mingjia,Zhou Fayang,Zou Haocheng,Zhu Boming,Zeng Yiqing,Zhang Shule,Zhong Qin
Abstract CrO x /black-TiO 2 catalysts were prepared by ligand-assisted (citric acid, oxalic acid and ethylenediaminetetraacetic acid) impregnation method. These catalysts were characterized in detail by means of X-ray diffraction, Raman, BET, X-ray photoelectron spectroscopy, H 2 and O 2 (NO) temperature programmed reduction or desorption and in-suit DFTIR spectra. The results indicated that ligands assistance was beneficial for CrO x interacted with oxygen vacancies and O–Ti–O structures. Among all the catalysts, CrO x /black-TiO 2 /CA (modified by citric acid) revealed excellent catalytic activity and stability for NO oxidation in the temperature range of 200–450 °C. The characterization results exhibited that the interaction existed between CrO x and oxygen vacancies resulting in more Cr 6+ . Moreover, the strong interaction between CrO x and O–Ti–O was attributed to the modification of carboxylic acid, which increased the content of Cr 3+ and chemical adsorption oxygen. High content of chemical adsorption oxygen promoted the adsorption ability of O 2 , and Cr 6+ enhanced the adsorption capacity of NO. Hence, chemical adsorption oxygen and Cr 6+ synergistically promoted the NO oxidation. Graphic Abstract
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Applied Materials Today
·
2020
·
IF 8.352
Ying Zhang,Jing Gao,Xin Xin,Lihui Wang,Heyu Li,Xiaobing Zheng,Yanjun Jiang
The successful combination of enzymes and photocatalysts in one pot is an elegant approach for the reactions with high efficiency. This combination usually requires both enzymes and photocatalysts with reasonable activity under the same condition. Herein, a photo-enzyme integrated catalyst by immobilizing laccase on clustered porous TiO 2 heterophase junction (HPJs) microsphere (denoted as mTiO 2 -CVs) is synthesized for the first time. The TiO 2 microsphere with ordered regular radial structure and controllable heterophase junction (anatase/rutile) composition is prepared by a pressure-driven hydrothermal assembly method. The ratio of rutile and anatase phase of mTiO 2 -CVs can be controlled by adjusting the amount of hydrochloric acid in the preparing process. The characterization results of mTiO 2 -CVs prove that the mTiO 2 -CVs has regular morphology, uniform mesoporous structure, larger specific surface area and narrower band gap, and can realize the effective utilization of visible light. After immobilizing laccase on mTiO 2 -CVs by adsorption method, the integrated catalyst (mTiO 2 -CVs2.5@lac) can be obtained. Compared with free laccase, mTiO 2 -CVs2.5, and commercial P25, mTiO 2 -CVs2.5@lac shows higher catalytic efficiency in the emerging contaminants degradation under visible light. Therefore, the photo-enzyme integrated catalyst presented in this study provides a promising platform for emerging organic pollutants degradation by combining the enzymes with photocatalysts
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JOURNAL OF CATALYSIS
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2020
·
IF 7.888
Xiqiang Tian,Muhammad Zahid,Jiang Li,Wang Sun,Xiaoyu Niu,Yujun Zhu
The addition of a suitable co-catalyst is an encouraging way to enhance the catalytic performance of Pd based catalyst with low content. Herein, we describe an easy synthesis of Mo 2 N-TiO 2 with well-dispersed Mo 2 N nanoparticles through one pot evaporation-induced self-assembly and nitridation treatment method. Moreover, a green bio-reductive approach with Catalpa Fruit ( CF ) extract was adopted to fabricate Pd/Mo 2 N-TiO 2 catalysts for promoting selective hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) as model reaction. Among these Pd/Mo 2 N-TiO 2 catalysts, 0.8 wt%Pd/Mo 2 N-TiO 2 exhibits significantly high catalytic activity for selective hydrogenation of various nitrophenols and cinnmaldehyde. Importantly, the catalytic activity of the catalyst prepared by the reduction method of the CF extract is higher than that prepared by the reduction method of NaBH 4 . A serials of characterization, including XRD, N 2 adsorption–desorption, TEM, XPS, CO chemisorption and CO-FTIR etc., was carried out to investigate the influence of the prepared method on the surface Pd species and activity. The high performance can be attributed to the specific nanostructure characteristics of the catalyst and the good synergistic effect between Pd and Mo 2 N, improving the dispersion of Pd nanoparticles atoms and the exposure of more active Pd atoms (surface Pd 0 species) on 0.8 wt%Pd/Mo 2 N-TiO 2 due to the CF extract as reductant.
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MATERIALS & DESIGN
·
2021
·
IF 7.991
Baolin Chen,Xun Wang,Xia Gao,Jie Jiang,Mancheng Hu,Shuni Li,Quanguo Zhai,Yucheng Jiang
In this work, TiO 2 nano particle was used for two purposes: it played as a role of a solid carrier for immobilization of HRP, and meanwhile acted as a photo-catalyst itself. In this way, the loss of enzymatic activity during enzyme immobilization can be compensated by the coupling of TiO 2 photo-catalysis. Then, the surface of TiO 2 nanoparticles were modified by phase-transitioned lysozyme (PTL) and connected with horseradish peroxidase (HRP) via a DNA helix ( [email protected] 2 ). The DNA double helix chain was utilized as a flexible spacer arm to keep the flexibility of the immobilized enzyme. The [email protected] 2 showed a high recovered activity (90.52%) of the original activity of free HRP. This data is better than most reported activity recovery of immobilized enzyme. Moreover, [email protected] 2 can maintain high catalytic activity, stability and reusability when degrading phenol in wastewater. The phenol of 0.5 mmol∙L −1 could be totally degraded within 10 min. Moreover, a visual colorimetric method for phenol concentration by [email protected] 2 was established, and the phenol concentration of 0–0.2 mmol∙L −1 can be visually detected with naked eyes. Furthermore, an enzymatic-photocatalytic synergetic effect of [email protected] 2 is found and investigated. The efficiency of [email protected] 2 ensures it a potential application in the wastewater treatment.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Lifang Fan,Guifang Liang,Caiyun Zhang,Li Fan,Wenjun Yan,Yujing Guo,Shaomin Shuang,Yingpu Bi,Feng Li,Chuan Dong
In this work, a visible-light-driven photoelectrochemical (PEC) sensing platform was developed based on BiOI nanoflowers/TiO 2 nanotubes (BiOI NFs/TiO 2 NTs) for detection of atrazine (ATZ). The BiOI NFs/TiO 2 NTs p–n heterojunctions synthesized by decorating BiOI NFs on TiO 2 NTs via simple hydrothermal approach exhibit strong visible-light absorption ability, high photocurrent response and PEC activity. Thus BiOI NFs/TiO 2 NTs heterostructures were first explored to act as the photoelectrode for the immobilization of the anti-ATZ aptamer to develop a PEC sensing platform. The design PEC aptasensing platform exhibits prominent analytical performance for determination of ATZ with a low detection limit of 0.5 pM under visible-light irradiation, and displays good selectivity for ATZ in the control experiments. The superior behavior of the sensing platform could be ascribed to the design of the appropriate sensing material with tubular microstructure, excellent PEC response of the photoelectrode, and the large loading amount of aptamer. Meanwhile, the PEC sensing platform was used to determine ATZ in environmental samples and a satisfied result was obtained.
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ChemElectroChem
·
2020
·Vol. 7
·期 24
·4963-4970
·
IF 4.154
Dongyang Qu,Zhonghui Sun,Shiyu Gan,Lifang Gao,Zhongqian Song,Huijun Kong,Jianan Xu,Xiandui Dong,Li Niu
Graphical The 2D structured Fe 2 O 3 /TiO 2 composite nanoplates offers open channels for favorable ion and electron transports. The combination of TiO 2 with a steady structure further provides sufficient volume fluctuation space for Fe 2 O 3 . Fe 2 O 3 /TiO 2 nanoplates as an anode material thus exhibit favorable rate and cycle performances for lithium-ion batteries compared with Fe 2 O 3 . After assembled with LiFePO 4 cathode, the full cell also demonstrates stable cycle capacity (132 mAh g −1 at 0.1 A g −1 after 150 cycles). The rapid capacity decay is one of the challenges for the anodes of metal oxides-based lithium-ion batteries (LIBs). Herein, we report a characteristic nanoplate-structured metal oxide anode consisting of hexagonal Fe 2 O 3 and TiO 2 (denoted as Fe 2 O 3 /TiO 2 ) via a facile hydrothermal strategy. Owing to two-dimensional (2D) structured and stable TiO 2 modifier, Fe 2 O 3 /TiO 2 composite demonstrates significantly improved electrochemical LIBs performances. The Fe 2 O 3 /TiO 2 composite material buffers the volume expansion of Fe 2 O 3 and improves the rate capability and cycling performances. Upon 1000 long-term cycles, the anode electrode delivers high discharge capacity of 1056 mAh g −1 at 0.5 A g −1 . The full cell that is composed of Fe 2 O 3 /TiO 2 as the anode and commercial LiFePO 4 as the cathode delivers superior rate capacity (84 mAh g −1 at 2 A g −1 ) and stable cycle capacity (132 mAh g −1 at 0.1 A g −1 after 150 cycles). This 2D composite nanostructure offers an approach to improve the metal oxide-based anodes of LIBs.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2020
·
IF 4.872
Xiarong Zheng,Yuanqiong Liu,Xiaobin Liu,Qingbiao Li,Yanmei Zheng
A novel composite electrospun fiber with high photocatalytic efficiency, good stability, strong hydrophobicity, good pollution resistance, and easy separation and recovery was synthesized. The TiO 2 @g-C 3 N 4 (TCN) with special core-shell structure (5–10 nm shell) facilitated the separation of photogenerated electron-holes and had high photocatalytic performance. The poly (vinylidene fluoride) (PVDF) electrospun fiber immobilized with TCN was successfully fabricated (PVDF-TCN) with uniform distribution and size of nanofibers by using electrospinning, which was used for degrading tetracycline under visible-light irradiation (> 400 nm). A special rougher surface of electrospun fiber obtained by washing of sacrificial PVP increased the specific surface area, which became more conducive to the adhesion of the catalyst. The water contact angle and FTIR results demonstrated that the electrospun fiber became extremely hydrophilic after adding TCN catalyst, which could effectively mitigate the fiber pollution. The PVDF-TCN-0.2g electrospun fiber exhibited excellent photocatalytic performance and the degradation efficiency of tetracycline was up to 97% in 300 min under visible-light irradiation. The mechanism of PVDF-TCN electrospun fiber degradation of tetracycline in the photocatalytic process was also proposed. In addition, the PVDF-TCN-0.2g exhibited a stable activity after 4 cycles experiments since the degradation efficiency remained about 90%. Therefore, we believed this study provided a new strategy in catalyst immobilization and wastewater treatment.
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