JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2017
·
IF 2.059
Chunyan Chi,Jiaqi Pan,Mingzhu You,Zongjun Dong,Weijie Zhao,Changsheng Song,Yingying Zheng,Chaorong Li
The porous TiO 2 nanotubes/Ag 3 PO 4 heterojunction are synthesized via simple electrospining and chemical co-deposition method. The results of SEM, XRD , TEM and XPS imply that the Ag 3 PO 4 nanoparticles have been introduced on to the surface of TiO 2 nanotubes successfully. Compared with the unmodified samples, the photocatalytic activity of the as-prepared porous TiO 2 nanotubes/Ag 3 PO 4 heterojunction exhibit a remarkable enhancement by the degradation of methylene blue (MB) under the sunlight. Further, the Z-Scheme structure of the samples and the porous-tubular structure of the TiO 2 are considered as the main reasons for the enhancement.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 44
·19192-19200
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IF 3.288
Jixin Ai,Zhiguang Guo
Functional superamphiphobic coatings have attracted great attention due to their promising applications in oil transportation and anti-contamination. Herein, a superamphiphobic cotton fabric with excellent mechanical stability and antifouling property was constructed by coating flower-like TiO2 nanoparticles onto the cotton fabric surface by a facile spraying method and further modification with 1H,1H,2H,2H-perfluorooctyltrichlorosilane (FOTS). The synthetic mechanism, surface structure, chemical composition of the F-TiO2 particles were investigated by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), respectively. The prepared cotton fabrics exhibited high liquid repellency to water, rapeseed oil, glycerol, 1,2-dichloroethane and n-hexadecane with a lower surface tension, showing a contact angle of 159°, 157°, 155°, 153° and152°respectively. Furthermore, the F-TiO2-coated fabrics displayed excellent self-cleaning and self-healing properties. Moreover, the great mechanical stability of F-TiO2 fabrics was confirmed after sand paper abrasion and water-impacting tests. The result indicates that F-TiO2 coatings with versatile abilities exhibited promising potential to achieve numerous applications.
研究领域:
材料科学
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2014
·Vol. 16
·期 16
·3403-3413
·
IF 3.858
Enyan Guo,Longwei Yin,Luyuan Zhang
We report on solar cells based on CdS QD sensitized anatase TiO2 hierarchical nanostructures prepared via a facile and controlled hydrothermal process. To adjust the size of CdS QDs, the TiO2 surfaces were first treated with thiolactic acid which provides a binding site for Cd2+ ions. CdS QDs with controllable size are grown onto the TiO2 hierarchical nanostructures. The CdS QDs/TiO2 hierarchical heterojunction nanocomposites display a red shift from the ultraviolet to the visible light region with a longer wavelength for the absorption edge. The matching of band edges between CdS and TiO2 to form a semiconductor heterojunction plays an important role in effective separation of light induced electrons and holes, providing a promising photoanode for its wide absorption spectrum, high electron injection efficiency, and fast electron transference. Under UV-vis irradiation, both CdS and TiO2 are excited. Under visible light irradiation, photons are captured by CdS QDs, with the photogenerated electron–hole pairs rapidly separated into electrons and holes at the interface between TiO2 and CdS QDs. In addition to this, more photoelectrons are generated from TiO2 by harvesting UV photons. TiO2 collects the photoelectrons from CdS and passes them through to the back contact. The holes (from both CdS and TiO2) generated in the process are transferred to the solid–liquid interface. Under one sun illumination, the solar cells based on CdS QDs/TiO2 hierarchical heterojunction nanocomposites with a smaller average size of 7.6 nm for CdS QDs show a maximum short circuit current density of 6.09 mA cm−2 and a conversion efficiency of 3.06%. The performance improvement of the solar cells based on CdS QDs/TiO2 hierarchical nanostructures can be attributed to the unique microstructure characteristics and the bandgap energy matching between the CdS QDs and TiO2.
研究领域:
材料科学
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纳米技术
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光伏技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Bingcai Chen,Pengpeng Li,Bing Wang,Yingde Wang
CO sensor is helpful to monitor the working state of combustion equipment, such as industrial boilers and engines, and to ensure the production process and human life safety. However, balancing fast response/recovery and high response value for metal oxide CO sensors remains a challenge. In this work, based on band gap engineering, porous TiO 2 /CeO 2 NSs with different TiO 2 coupling amounts were prepared by hydrothermal method combined with flame annealing. The heterojunction composed of TiO 2 and CeO 2 narrowed the energy band width of the composite system and made the electron transmission more efficient, which endowed TiO 2 /CeO 2 NSs with good gas sensing properties. The results indicated that the response value of TiO 2 /CeO 2 NSs is 9.78 time that of CeO 2 NSs. Its ultrafast response/recovery time (2 s/6 s), good CO selectivity and wide CO monitoring range (500 ppb-5000 ppm) are also impressive. The TiO 2 /CeO 2 NSs sensor has great potential for rapid CO monitoring.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Xiaoyuan Liu,Yu Zou,Jiang Jiang
Photocatalytic valorization is a sustainable approach for converting glycerol to value-added chemicals under ambient conditions, which remains challenging. Herein, using Au/TiO 2 as photocatalyst, we report glycerol oxidation reaction in non-pressurized reactor with borate additives. The activity and selectivity of photocatalytic glycerol oxidation depends on Au loading, borate concentration and solution pH. Both superoxide and hydroxyl radicals are generated due to oxygen reduction and water oxidation by photoexcited charge carriers. Apart from coordinating and protecting the oxidized intermediates from further oxidation, borate additives are discovered to up-regulate the superoxide radical generation, beneficial for C3 products formation. In pH 12 solution, C3 products selectivity of 58% and 37% on liquid-phase and carbon basis respectively, was realized at 94% glycerol conversion under AM 1.5 G irradiation for 4 h. Our finding may help guiding future catalyst design for photocatalytic biomass valorizations, where a balanced oxidative power is needed to steer the reaction pathway.
研究领域:
化学工程
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可再生资源转化
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2016
·
IF 0
Xu Cheng,Yue Ming Li,Biao Wang,Jian Ming Jiang
In this paper, low-temperature preparation of rice husk char/TiO2 composite was developed by utilizing agriculture waste. nanosized TiO2 particles were successfully loaded to rice husk char by in-situ thermal treatment of impregnated rice husk. The structural characteristics and photocatalytic activities of obtained composites were investigated. The specific surface area of rice husk char was enlarged due to the catalytic effect of loaded TiO2 during thermal treatment. The porous rice husk char matrix combined with nanosized TiO2 particles offered large specific surface area and good photocatalytic property. This low-temperature preparation method provided a promising way to reuse the waste biomass and extended the applications of charcoal.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
Coatings
·
2021
·Vol. 11
·期 8
·914
·
IF 2.881
Zihao Dong,Ran Li,Yan Gong
With chitosan, nano-TiO2and nano-Ag as raw materials, nano-TiO2and nano-TiO2-Ag were modified by a surface modifier-sodium laurate. Chitosan (CTS), chitosan-nano-TiO2(CTS-TiO2), and chitosan-nano-TiO2-nano-Ag (CTS-TiO2-Ag) composite materials and corresponding films were prepared by a solution co-blending method. Then, the antibacterial performances of the above three types of materials againstEscherichia coli,Staphylococcus aureus, andBacillus subtiliswere compared. Moreover, potato and strawberry weight loss rates, peroxidase activity, and vitamin C contents after different film coating treatments were measured. Compared with CTS films, the CTS-TiO2-Ag and CTS-TiO2composite films both showed better physical properties, and both demonstrated higher antibacterial effects, especially forE.coli. Measurement of physiological indices in fruits and vegetables showed that the freshness-preserving effect of CTS-TiO2-Ag coating films was the most significant. In all, the CTS-TiO2-Ag coating films can actively contribute to the storage of fruits and vegetables at room temperature, and better ensure product quality. Thus, such films are meaningful for research and development of new fruit freshness-keeping techniques and materials.
研究领域:
食品科学
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材料科学
✓ 已验证
DOI
高影响因子
Heliyon
·
2024
·
IF 3.4
Shibin Wu,Jingguang Wang,Zhenze Xie,Chang Du
Nano-TiO 2 photocatalysis technology has attracted wide attention because of its safety, nontoxicity and long-lasting performance. However, traditional nano-TiO 2 has been greatly limited in its application because its wide band gap can only be activated by ultraviolet light (λ < 387 nm). In this paper, nano-TiO 2 was prepared by self-doping method. The synthesized nano-TiO 2 was a single anatase crystal type with a particle size of 10 nm and uniform size. In addition, nano-TiO 2 has high stability and good dispersion. More importantly, nano-TiO 2 exhibits excellent visible light (400–780 nm) activity due to the decrease of bandgap from 3.20 eV to 1.80 eV (less than 2.0 eV) and the presence of a large number of hydroxyl groups on the surface of the nanoparticles. In the antibacterial test, the antibacterial rate of both E.coli and S.aureus was close to 100 % under the irradiation of household low-power LED lamps, showing excellent antibacterial performance, indicating that the prepared nano-TiO 2 has broad application prospects in the field of bactericidal and bacteriostatic.
研究领域:
材料科学
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环境科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Jiangbo Shi,Guiqiu Chen,Guangming Zeng,Anwei Chen,Kai He,Zhenzhen Huang,Liang Hu,Jingwen Zeng,Jing Wu,Weiwei Liu
In this study, graphene wrapped Fe-doped TiO 2 (G-TiO 2 -Fe) spheres were prepared through a simple hydrothermal process. The structural, optical and photocatalytic properties of synthesized composite were characterized by field emission scanning electron microscope (FE-SEM), X-ray diffraction ( XRD), Raman Microprobe (Raman), X-ray photoelectron spectroscopy (XPS) and UV–Vis diffuse reflectance spectrophotometer (DRS). The G-TiO 2 -Fe composite showed a significant red-shift in light response edge as compared with TiO 2 . Meanwhile, the band gap exhibited an obvious decline from 3.24 to 2.99 eV. The photocatalytic capacity of G-TiO 2 -Fe was further evaluated by methylene blue (MB) degradation experiments, and the results indicated that the optimized G-TiO 2 -Fe exhibited a remarkable increase in photocatalytic activity. The superior photocatalytic performance of the novel material could be ascribed to the synthetic effects of doped Fe and wrapped graphene shells. The unique geometrical configuration and constructive component which modified the TiO 2 electronic structure will largely improve the electron transporting efficiency and restrain the electron-hole recombination.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 19
·8693-8700
·
IF 3.591
Xianfeng Zhang,Zongqun Li,Shaowen Xu,Yaowen Ruan
Carbon nanosphere templates were prepared hydrothermally using glucose as a carbon source. A coated composite was formed by encapsulating the nanospheres with n-butyl titanate and calcinating the composite according to a controlled temperature programme to remove the carbon nanosphere templates; hollow-structured TiO2 nanospheres were obtained. Then, a TiO2/CQD nanocomposite was prepared with carbon quantum dots (CQDs) by covalent bonding. The structure and morphology of the carbon sphere templates, CQDs, TiO2 nanospheres and composite were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and other characterization techniques. The photocatalytic degradation of a methyl orange (MO) solution by the TiO2/CQD composite nanomaterial was studied. The results showed that the nanocomposites were hollow TiO2 spheres with a diameter of approximately 1.1 μm, a thickness of approximately 50 nm and a specific surface area of approximately 27.9 m2 g−1. The composite exhibited the highest visible light photocatalytic activity when the CQD content was 4.0%. The corresponding apparent first-order rate constant was 0.00429 min−1, which is 2.6 times greater than that of hollow TiO2.
研究领域:
材料科学
·
纳米技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Zhigang Wei,Yangfei Fang,Zhenrui Wang,Yue Liu,Yang Wu,Kai Liang,Jiahong Yan,Zhanchang Pan,Guanghui Hu
TiO 2 is one of the most cheap materials which can both adsorb arsenic and oxidize arsenite [As(III)] to arsenate [As(V)]. In this study, anatase TiO 2 crystals with different main facets such as {101}, {001} and {100} are synthesized and used to investigate arsenic adsorption kinetics, adsorption isotherms, photocatalytic oxidation (PCO) process and the pH effects. The adsorption kinetics of arsenic on TiO 2 crystals can be described by the pseudo second-order kinetic model. For the adsorption isotherms, the Langmuir model is better than the Freundlich model for arsenic on these TiO 2 crystals. For the PCO process, the rate of As(III) oxidation can be denoted by the pseudo first-order kinetic model. It should be noted that at neutral condition the adsorption and PCO rates of the three kinds of TiO 2 crystals follow the order of {101} > {001} > {100}. The pH effect is above all important for both the arsenic adsorption and its PCO. The highest PCO speed appears at high pH values such as at pH 11 or 12.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Dong Yang,Xuyang Zhao,Yao Chen,Wenjing Wang,Zhiyuan Zhou,Zhanfeng Zhao,Zhongyi Jiang
The g-C3N4 nanosheet/TiO2 (CNNS/TiO2) heterojunctions have been synthesized by using polydopamine (PDA) as both linker and inducer enlightened by the bioadhesion and biomineralization mechanisms existing in mussel and shellfish in this study. In the as-prepared CNNS/TiO2 sample, TiO2 nanoparticles about 5 nm in size distribute on the CNNS surface uniformly. Moreover, the heterojunction structure is formed between TiO2 and CNNS. In contrast with CNNS and TiO2, the CNNS/TiO2 heterojunctions display much more superior Rhodamine B (RhB) photocatalytic degradation activity, which can reach 100% within 60 min under irradiation of visible light and preserves excellent stability after four recycles. The heterojunction structure formed by CNNS and TiO2 is conducive for separation of the photogenerated carriers and thus is favorable for improving photocatalytic performance. This method may develop a novel avenue to broadly synthesizing CNNS-based nanocomposites with superior photocatalytic performance.
研究领域:
材料科学
·
环境科学
·
生物仿生学
✓ 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）