DALTON TRANSACTIONS
·
2017
·Vol. 47
·期 5
·1666-1673
·
IF 4.029
Yan Lv,Lin Yue,Qian Li,Baoyi Shao,Sen Zhao,Haitao Wang,Shijia Wu,Zhouping Wang
Herein, the design and synthesis of a multifunctional (Fe3O4-NaYF4:Yb,Tm)@TiO2 photocatalyst through a facile sol–gel process combined with electrostatic self-assembly has been reported. Particularly, as an upconversion sensor, NaYF4:Yb,Tm nanoparticles have the ability to convert near-infrared (NIR) light into ultraviolet (UV) emissions, so that the catalytic body TiO2 can indirectly utilize the NIR part of sunlight but not UV light. The excellent photocatalytic activity of the hybrid samples is evaluated using a model of the degradation of methylene blue (MB). Most importantly, the obtained materials exhibit remarkable magnetic properties because of the addition of a magnetic component (Fe3O4), therefore, the photocatalysts possess desired recyclability and reusability, which is significant for actual applications. Finally, the possible photocatalysis mechanism of the nanohybrids is discussed and hydroxyl radicals (OH˙) are confirmed as the main reactive species.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Yuchuan Liu,Zongxue Yu,Yixin Peng,Liangyan Shao,Xiuhui Li,Haojie Zeng
The graphene-based film is an interlayer separation film having a special mass transfer property. In this study, a novel TiO 2 nanorod inserted graphene-based membrane on a CA (Cellulose Acetate) mat was fabricated by a vacuum filtration method for water treatment application. The intercalated TiO 2 nanorods expanded the interlamellar spacing among the graphene sheets and thus advanced the separation efficiency of graphene-based membrane, which exhibited a flux several times higher than some commercial nanofiltration membranes and an extremely high rejection especially for dyes, for MB (99.3%), Rhb (99.4%), MO (99.3%), CR (99.6%).
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2019
·Vol. 10
·期 1
·1-10
·
IF 11.878
Wang Shaolei,Xu Min,Peng Tianyou,Zhang Chengxin,Li Tao,Hussain Irshad,Wang Jingyu,Tan Bien
Significant efforts have been devoted to develop efficient visible-light-driven photocatalysts for the conversion of CO 2 to chemical fuels. The photocatalytic efficiency for this transformation largely depends on CO 2 adsorption and diffusion. However, the CO 2 adsorption on the surface of photocatalysts is generally low due to their low specific surface area and the lack of matched pores. Here we report a well-defined porous hypercrosslinked polymer-TiO 2 -graphene composite structure with relatively high surface area i.e., 988 m 2 g −1 and CO 2 uptake capacity i.e., 12.87 wt%. This composite shows high photocatalytic performance especially for CH 4 production, i.e., 27.62 μmol g −1 h −1 , under mild reaction conditions without the use of sacrificial reagents or precious metal co-catalysts. The enhanced CO 2 reactivity can be ascribed to their improved CO 2 adsorption and diffusion, visible-light absorption, and photo-generated charge separation efficiency. This strategy provides new insights into the combination of microporous organic polymers with photocatalysts for solar-to-fuel conversion.
研究领域:
材料科学
·
环境科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Honghong Liu,Hong Gong,Mingming Zou,Heng Jiang,Rasaki Sefiu Abolaji,Ayesha Khan Tareen,Branislav Viliam Hakala,Minghui Yang
Mo-N-co-doped mesoporous TiO 2 microspheres were synthesized via a solvothermal method, followed by nitriding treatment under ammonia gas flow. The efficiency of the samples was investigated by monitoring the degradation of Rhodamine-B under visible light irradiation. The experimental results revealed that Mo-N-co-doped mesoporous TiO 2 microspheres showed better performances than Mo-TiO 2 microspheres. It was observed that; 0.1% molar quantity of Mo doped on TiO 2 at 500 °C for 2 h under nitriding conditions gave highest photocatalytic activities. The nitridation under ammonia gas of Mo-TiO 2 samples created oxygen vacant sites and led to incorporation of substitutional and interstitial Nitrogen. The enhanced visible light photocatalytic activities of Mo-N-co-doped TiO 2 photocatalyst was attributed to the large surface areas, narrow band gap and intense light absorbance in visible region. This study may create a promising and eco-friendly method towards synthesis of metal and non-metals co-doped on semiconductor materials to improve their photocatalytic activities and applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Xiaohong Wang,Li Qi,Hongyu Wang
Anatase TiO2 used as the sodium-storage anode is coupled with a graphite cathode to construct dual-ion batteries. The batteries display wide voltage window (1.0–4.7 V), long cycling stability (98 mAh g–1 after 1400 cycles at 500 mA g–1), and considerable rate performance (102 mAh g–1 at 1500 mA g–1). Furthermore, the kinetic behaviors of Na+ and PF6– ions are investigated through electrochemical impedance spectroscopy, the galvanostatic intermittent titration technique, and the potentiostatic intermittent titration technique. The corresponding apparent ion diffusion coefficient is calculated, and the results indicate that the transport of PF6– anions in the graphite cathode is swift.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 16
·15754-15765
·
IF 2.195
Sun Jialin,Huang Dejia,Liu Rui,Dai Jingtao,Chen Jian
To improve the visible-light photocatalytic performance of TiO 2 for practical application, Ag/AgBr modified TiO 2 was fabricated in ionic liquid–water medium via a facile hydrothermal-reduction method. The visible-light catalytic activity of as-prepared Ag/AgBr/TiO 2 was measured using tetracycline (TC) as the target pollutant. Characterizations by various techniques (SEM–EDS, XRD, XPS and DRS) and the quenching experiments with scavengers for possible active species (h + , • O 2 − and ·OH) were executed to probe the mechanism underlying the photocatalytic performance. Critical impacts from the catalyst and solution chemistry were evaluated in the mediums of TC solution, simulated wastewater and real wastewater sample. The results suggested that: (1) benefitting from the visible-light sensitive Ag/AgBr and high specific surface area TiO 2 , Ag/AgBr/TiO 2 exhibits fair stability and remarkable visible-light photocatalytic activity; (2) under optimized conditions, Ag/AgBr/TiO 2 provides higher visible-light catalytic activity than Ag/AgBr and TiO 2 ; (3) the coexisting inorganic ions with high concentration in the simulated wastewater sample depress TC photo-degradation, and the impacts varies with the species of inorganic ions; (4) COD removal rate about 65.5% in real wastewater sample proves that Ag/AgBr/TiO 2 can mineralize TC promptly and almost completely.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2013
·
IF 5.521
Jie Xiao,Wenqin Chen,Fangyingkai Wang,Jianzhong Du
TiO2 nanoparticle has been considered as a safe sunscreen agent to reduce the skin cancer risk when exposed to sunlight. However, recently it was found that TiO2 particles accelerate the photodamage of skin due to their photocatalytic degradation activity. To effectively eradicate this unwanted effect, we present a new strategy toward the preparation of organic/inorganic hybrid polymer/TiO2 nanoparticles with highly effective UV-screening property but eliminated photocatalytic activity. We prepared new polymer micelles with corona–shell–core structure based on self-assembly of poly(ethylene oxide)-block-poly(2-(dimethylamino)ethyl methacrylate)-block-poly(styrene) (PEO-b-PDMA-b-PS) triblock copolymer. Selective deposition of hydrophobic tetrabutyl titanate (TBT) in the PDMA shell in polar solvent leads to a thin PDMA/TiO2 hybrid layer (∼8 nm), which can not only effectively reflect UV rays but also eliminate its photocatalytic ability to protect skin. The sol–gel reactions of TBTs in the PS core domain lead to a PS/TiO2 hybrid core, which can also absorb/reflect UV lights by PS/TiO2. The biocompatible PEO coronas can prevent direct contact of TiO2 with skin. Moreover, sol–gel reactions in the PDMA and PS domains can stabilize the triblock copolymer micelles, which offer the promising potential for further formulations in aqueous solution. The ATRP kinetics confirmed that PEO-b-PDMA-b-PS triblock copolymer can be synthesized in one pot, which simplified the synthetic procedure of copolymers. TEM and DLS studies revealed the morphology and size of self-assembled polymer micelles and the subsequent polymer/TiO2 hybrid nanoparticles upon sol–gel reactions. UV experiments confirmed the highly efficient UV screening activity but eliminated photocatalytic property of polymer/TiO2 hybrid nanoparticles. For example, at extremely low TiO2 content in solution (10 ppm of polymer/TiO2 solid), ∼70% UV radiation can be blocked compared to pure organic polymer micelle, which is also much more efficient than commercially available TiO2 nanoparticles (P25). UV and DLS studies confirmed the ultrahigh stability of polymer/TiO2 hybrid nanoparticles upon strong UV radiation, which is suitable for long-term applications. Nitrogen adsorption/desorption experiment revealed that the ultralow surface area of TiO2 nanoparticles (1.6 m2 g–1) is consistent with their extremely poor photocatalytic performance.
研究领域:
材料科学
·
生物医学工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 14
·D663
·
IF 3.662
Xue Bai,Kai Gao,Xin Huang,Caidie Qin,Yi Zhang,Xuan Han
Three-dimensional (3D) metal inorganics have gained tremendous interests for a series of applications. Here, we prepared TiO2 microspheres, urchin-like TiO2, and flower-like TiO2 by hydrothermal method. The morphologies of the three 3D TiO2 nanostructures were characterized by scanning electron microscopy and X-ray diffraction analyses. The electrochemical behaviors of the 3D TiO2 nanostructures were investigated by electrochemical impedance spectroscopy and cyclic voltammetry studies. Results showed that 3D TiO2-modified electrodes exhibited improved electrochemical performance compared with bare electrode. The three 3D nanostructures were then used with a modified glassy carbon electrode to detect dopamine (DA). According to the experimental results, the flower-like TiO2/GCE demonstrated excellent electrochemical performance than the two other electrodes. The enhanced electrochemical performance of the 3D flower-like TiO2/GCE is mainly affected by the structure of anatase crystal, which is the most important factor for the enhanced electrochemical performances toward DA detection. The flower-like TiO2/GCE, urchin-like TiO2/GCE, and TiO2 microspheres/GCE possessed linear ranges of 0.02–160, 1–180, and 1–160 μM, with limit of detection values of 0.007, 0.31, and 0.33 μM, respectively.
研究领域:
材料科学
·
电化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2022
·Vol. 6
·期 12
·1637-1646
·
IF 8.683
Zeju Zhang,Lili Chen,Yanhui Zhao,Jielei Huang,Chenfeng Ding,Chunlei Liu,Yaochun Liu,Xiaofen Hong,Yuan Liu,Chunzhao Liu
Three-dimensional (3D) TiO2 hierarchical micromaterials assembled using high-aspect-ratio nano building blocks have exhibited many unique features of good structural stability, efficient mass transport/charge transfer properties and excellent light harvesting capability, which enable them to be successfully used for photocatalysis application. However, synthesis and structural control of the nano-/micro-materials pose serious challenges in materials design, such as requiring complex and time-consuming procedures, and harsh reaction conditions. Herein, we develop a simple wet-chemistry method combined with stirring procedure to construct new nanowire-assembled TiO2 submicron fibers with hierarchical structures. Results suggest that the mechanical force-driven stirring process increases the diffusion and surface reaction rate of intermediate hydrated titanate nanocrystal growth in the solution phase, leading to the generation of long tortuous nanowires and thereafter the formation of a new 3D nanowire-assembled hierarchical structure. The final 3D TiO2 nanowire-assembled micromaterials have a relatively large surface area of 184 m−2 g−1 with abundant hierarchical pores, which create an ideal micro-reactor for promoting the degradation of 2,4-dichlorophenol and Rhodamine B under UV light. The good photocatalytic performance is attributed to the unique structure of the TiO2 hierarchical nano-micromaterials, including a hierarchical pore structure and a dual-phase-induced rich interface. This work presents a facile and cost-effective approach that is potentially competitive for scaling-up the production of novel TiO2 nano-micromaterials with desired porous hierarchy for advanced application.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Haile Liu,Tursun Abdiryim,Ruxangul Jamal,Xiong Liu,Mariyam Niyaz,Lielie Liu,Hujun Zhang,Dongna Zou,Junxia Li,Yanyan Song,Jin Wei
The ideal material for detecting ultraviolet(UV) is TiO 2 nanorods (TiO 2 NRs). However, the photosensitive response speed and response speed of TiO 2 NRs are affected by its surface defects . We need to choose an appropriate method to solve this problem. In this study, TiO 2 NRs and D-A-D type conducting polymer containing pyridazine as the acceptor unit and 3,4-propylenedioxythiophene as the donor unit 3,6-bis (2- (3,4-propylidene dioxythiophenyl)) pyridazine are electrochemically combined to fabricate UV photodetectors . The structure of the material is analyzed by SEM , mapping, XRD , FT-IR, UV–vis and XPS , indicating the strongly enhanced synergistic effect between PProDOT-Pz and TiO 2 NRs and the homogeneous distribution of polymer on the TiO 2 NRs surface. The results show that under the low power (0.35 mW cm −2 ) UV illumination, the hybrid system has high responsivity (342.19 mA W −1 ) large detectivity (1.36 × 10 11 Jones) fast time pulse response (T rise = 6.2 s, T decay = 7.7 s) and EQE (110.35%) at the bias voltage of 3 V. More importantly, the photodetector works stably with good repeatability, which shows that the device configuration based on TiO 2 NRs and PProDOT-Pz heterojunction is proved to be an excellent candidate device with high sensitivity and fast response for UV signal.
研究领域:
材料科学
·
光电材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Xilin Liao,Hai-Tao Ren,Baolei Shen,Jia-Horng Lin,Ching-Wen Lou,Ting-Ting Li
In this work, TiO 2 nanofiber membrane (NFM) with a complete surface microstructure was prepared through regulating the surface microstructure of TiO 2 NFM by doping Zr. The crystal structures and morphological analyses indicated that the nanofiber membranes were consisted by disordered accumulation of Zr-doped TiO 2 nanofibers with a crack-free surface, small grain size and high aspect ratio . When the doping amount of Zr was 0.8 mL, the tensile strength of the doped membranes reached 1.27 MPa, which was 60.7% higher than that of pure TiO 2 NFM. The photocatalytic performance of Zr-doped TiO 2 NFM was evaluated by the degradation performance of Methylene orange (MO) under simulated sunlight irradiation. Compared with the undoped TiO 2 NFM, the 0.8-Zr/TiO 2 NFM presented a higher catalytic degradation efficiency (improved by 69.6%), and the photocatalytic performance maintained stable after five circulating. It was found that the doping of Zr ions effectively limited the surface crack size and grain size of TiO 2 nanofibers, thereby improving the tensile strength, and enhanced the surface area effect and carrier transfer efficiency of TiO 2 NFM. On the other hand, a narrow band-gap was obtained by doping a small amount of Zr ions, which expanded the visible light response range to improve the photocatalytic performance of TiO 2 nanofibers.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 10
·7138-7149
·
IF 2.993
Liang Zhen,Zhang Xiaojun
In this article, TiO 2 -modified ZnO nanotube arrays (NTAs) are successfully synthesized and used to prepare a nonenzymatic biosensor for the detection of glucose and hydrazine hydrate. In brief, the ZnO@TiO 2 NTAs are synthesized on zinc foil by two steps of simple hydrothermal method. Therefore, it can be directly used as a working electrode and is not needed to be modified to other electrode surface by any means to form a sensor. In the oxidation of glucose and reduction reaction of hydrazine hydrate, it exhibits excellent electrocatalytic performance. Moreover, it has high sensitivity, a fast response time (less than 3 s), and a detection limit as low as 0.5 μM (S/N = 3) toward glucose and hydrazine hydrate respectively. In the selectivity of the target analyte, the Zn–ZnO@TiO 2 nanocomposite electrode can effectively resist the influence of different interferent, including uric acid, dopamine, and l -cysteine.
研究领域:
材料科学
·
分析化学
·
生物传感技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）