APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Chunquan Li,Zhiming Sun,Ankang Song,Xiongbo Dong,Shuilin Zheng,Dionysios D. Dionysiou
Natural minerals are generally accepted as one of the most suitable carriers to support TiO 2 in photocatalytic and other applications because of their abundance, low cost, large surface area, and easy recyclability. Hence, in this work, a novel 0D/2D TiO 2 /kaolinite composite endowed with presence of oxygen vacancies and surface defect sites was synthesized through a mild sol-gel method combining with nitrogen induction. Ciprofloxacin (CIP) was taken as the main target organic pollutant to study the photocatalytic performance of the synthesized catalyst. The results showed that the nitrogen treated TiO 2 /kaolinite composite exhibited improving degradation performance for adsorption-photocatalytic elimination of CIP within broad radiation spectrum (200–800 nm). The synthesized composite exhibited enhanced reaction rate constant which is nearly 7.00, 2.54 and 3.13 times higher than that of bare TiO 2 treated with air under UV, solar, and visible light, respectively. Moreover, the newly prepared composite also exhibited significant enhancement towards the removal of formaldehyde under both UV and visible light. Radical scavenger experiments and ESR results indicated that holes should be the main oxidizing species within broad spectrum in the degradation system. The enhanced activity of nitrogen treated composite is mainly attributed to the induced oxygen vacancies as well as the intimate interface contact between TiO 2 and kaolinite , resulting in smaller grain size, higher light absorption ability, and faster carrier separation efficiency. It is expected that this high-efficiency composite photocatalyst based on natural minerals will be a promising candidate for the elimination of pharmaceutical and personal care products and volatile organic compounds within broad radiation spectrum.
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PACKAGING TECHNOLOGY AND SCIENCE
·
2018
·Vol. 31
·期 9
·575-584
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IF 1.808
Shuting Huang,Huijie Li,Yixiang Wang,Xinghai Liu,Houbin Li,Zhan Zhan,Ling Jia,Lingyun Chen
Oxygen is crucial to food preservation and food spoilage. For the purpose of monitoring the integrity of modified atmosphere packaging (MAP) by nondestructive testing and controlling the reaction rate during recovery stage, we reported on a convenient and visual colorimetric oxygen indicator based on a graphene/titanium oxide composite, incorporating glycerol, methylene blue (MB), hydroxyethyl cellulose, and polyvinyl alcohol. The graphene/titanium oxide composite was synthesized from a modified Hummers synthesis of graphene oxide, followed by the hydro-thermal treatment with butyl titanate without using any reducing agent, then the morphology and structure characteristics were analysed by X-ray diffraction, Fourier transform infrared, Raman spectra, ultraviolet - visible spectroscopy, SEM, and TEM. Supported by the performance tests using ultraviolet - visible spectroscopy and CIElab, the indicator demonstrated the pseudo first-order kinetics of MB for MAP in detecting stage. The results confirmed that the prepared colorimetric indicator could actually detect the integrity of MAP without destruction. Additionally, the reaction time of indicator in recovery stage can be controlled by changing the concentration of MB because of pseudo first-order kinetics.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Hamidreza Abadikhah,Ehsan Naderi Kalali,Samaneh Khodi,Xin Xu,Simeon Agathopoulos
High desalination performance, dye retention, and antibacterial properties were achieved with a multifunctional thin-film nanocomposite (MTFN) membrane, fabricated by the incorporation of a novel nanocomposite structure of reduced graphene oxide@TiO2@Ag (rGO@TiO2@Ag) into the polyamide active layer. The specific characteristics of the graphene-based nanocomposite, synthesized by the microwave-assisted irradiation process, favored water channelization and provided superhydrophilicity and antibacterial properties to the MTFN membranes. In comparison with the conventional methods, such as multistep chemical process using strong agents for reduction and long-term energy-consuming hydrothermal process, microwave irradiation facilitated a green, fast, and cost-effective route for the fabrication of GO-based nanocomposites for multifunctional applications. Interfacial polymerization was performed on a polyethersulfone/Si3N4 robust hollow fiber substrate using m-phenylenediamine aqueous solution and 1,3,5-benzenetricarbonyltrichloride organic solution. The structural and chemical characteristics of the synthesized nanocomposites and the MTFN membranes were thoroughly studied by a series of characterization analyses (transmission electron microscopy, field emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and atomic force microscopy). The physicochemical properties and the nanofiltration performance of the MTFN membranes were investigated after the incorporation of rGO@TiO2@Ag at various concentrations. The water contact angles confirmed the superb surface hydrophilicity of the MTFN membranes. High permeability (52 L·m–2·h–1), desalination (96% for 1 g/L Na2SO4 feed solution), and dye retention (98% for 0.5 g/L rose bengal feed solution) were recorded for MTFN enriched with 0.2 wt % rGO@TiO2@Ag. A 90% reduction in the number of viable bacteria (Escherichia coli), after 3 h of contact with MTFN membranes, confirmed the superior antibacterial activity of the produced membranes.
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高影响因子
Catalysis Science & Technology
·
2018
·Vol. 8
·期 7
·1936-1944
·
IF 5.365
Zhongmin Liu,Yongchuan Wu,Jitao Chen,Yaru Li,Jingyu Zhao,Kaihua Gao,Ping Na
A bifunctional cake-like TiO2 was successfully synthesized via calcination of MIL-125(Ti) at a suitable temperature by a one-step method and was applied for As(III) removal by simultaneous photocatalytic oxidation and adsorption. The as-synthesized samples were characterized by XRD, TGA/DSC, SEM, TEM, N2 adsorption–desorption isotherms, PL spectra, photocurrent, FTIR and XPS. The effects of calcination temperature on the specific surface areas of the samples, transformation of the TiO2 crystal phase and properties of As(III) removal were investigated. The results showed that higher calcination temperature resulting in a lower specific surface area and more transformations of the TiO2 crystal phase from anatase to rutile. The TiO2 calcined at 380 °C (MIL-125(Ti)-380 °C) exhibited excellent properties for As(III) removal, including photocatalytic oxidation of As(III) and simultaneous adsorption of the generated As(V). In addition, MIL-125(Ti)-380 °C could be reused at least four times without significant reduction in the photocatalytic oxidation and adsorption performances. The excellent photocatalytic oxidation and adsorption abilities of MIL-125(Ti)-380 °C can be attributed to the synergistic effects of strong photogenerated electron–hole separation and high specific surface area. The bifunctional cake-like TiO2 provides a wonderful strategy to remove As(III) completely from contaminated water using a single step.
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CHEMICAL ENGINEERING JOURNAL
·
2013
·
IF 3.473
Ziyang Lu,Weichao Zhou,Pengwei Huo,Yingying Luo,Ming He,Jianming Pan,Chunxiang Li,Yongsheng Yan
Fly-ash cenospheres were obtained from coal fly ash, while coal fly ash, as a kind of by-product produced during the combustion of coal, was a typical solid waste. In order to achieve the purpose of treating wastewater by solid waste and increasing the reuse rate of photocatalyst, the novel TiO 2 photocatalyst was achieved based on a magnetic composite as the carrier via a mild sol–gel method. This magnetic composite was prepared by coating a special layer of macromolecule onto the surface of the floating carboxyl-functionalized fly-ash cenospheres via microemulsion process, and magnetic Fe 3 O 4 nanoparticles were introduced into the special layer of macromolecule. The as-prepared photocatalyst was extensively characterized by scanning electron microscope (SEM), UV–vis diffused reflectance spectra (UV–vis), Fourier-transformed infrared spectra (FT-IR), thermogravimetric analyzer (TGA) and vibrating sample magnetometer (VSM). The results indicated that the as-prepared TiO 2 photocatalyst possessed hollow spherical structure and magnetic properties (Ms = 0.74 emu/g), floated in aqueous solution and had the average diameter between 100 μm and 150 μm. Moreover, this photocatalyst was proved to exhibit high catalytic efficiency and excellent photochemical stability, and the removal efficiency could reach nearly 75.32% for degradation of enrofloxacin hydrochloride residues in 60 min under visible light irradiation. In addition, the influence of calcination temperatures and inorganic salts on photocatalytic activity was also investigated. The results showed that different calcination temperatures and the presence of inorganic salts both had a great impact on the photodegradation of enrofloxacin hydrochloride.
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Nanoscale
·
2013
·Vol. 5
·期 18
·8703-8710
·
IF 6.233
Fang Deng,Lujuan Min,Xubiao Luo,Shaolin Wu,Shenglian Luo
Conductive polypyrrole–polyaniline/TiO2 nanocomposites (PPy–PANI/TiO2) were prepared by in situ oxidative copolymerization of pyrrole and aniline monomers in the presence of TiO2. For comparison studies, polypyrrole/TiO2 (PPy/TiO2) and polyaniline/TiO2 (PANI/TiO2) were also prepared. The samples were characterized by X-ray diffraction, transmission electron microscopy, UV-vis diffuse reflectance spectroscopy, zeta potential analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis and photocurrent tests. In contrast to PPy/TiO2 and PANI/TiO2, PPy–PANI/TiO2 exhibits obvious absorption in the visible-light range, and is much superior to PPy/TiO2 and PANI/TiO2 in thermal stability. It is found that PPy–PANI/TiO2 performs well in the visible-light photocatalytic degradation of 4-nitrophenol. The optimized pyrrole : aniline : TiO2 molar ratio for best performance is 0.75 : 0.25 : 100. The efficacy of PPy–PANI/TiO2 is attributed to its conductivity, conjugated structure, as well as to the synergy amidst polypyrrole, polyaniline and TiO2.
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高影响因子
Nano Research
·
2016
·Vol. 9
·期 3
·745-754
·
IF 8.893
Wu Tianxing,Wang Guozhong,Zhu Xiaoguang,Liu Porun,Zhang Xian,Zhang Haimin,Zhang Yunxia,Zhao Huijun
A chitosan-polyvinyl alcohol (CS/PVA) co-polymer substrate possessing a large number of amino and hydroxyl groups is used as a substrate to induce the direct growth and in situ sequential transformation of titanate crystals under HF vapor phase hydrothermal conditions. The process involves four distinct formation/transformation stages. HTiOF 3 crystals with well-defined hexagonal shapes are formed during stage I, and are subsequently transformed into {001} faceted anatase TiO 2 crystal nanosheets during stage II. Interestingly, the formed anatase TiO 2 crystals are further transformed into cross-shaped and hollow squareshaped HTiOF 3 crystals during stages III and IV, respectively. Although TiO 2 crystal phases and facet transformations under hydrothermal conditions have been previously reported, in situ crystal transformations between different titanate compounds have not been widely reported. Such crystal formation/transformations are likely due to the presence of large numbers of amino groups in the CS/PVA substrate. When celluloses possessing only hydroxyl groups are used as a substrate, the direct formation of {001} faceted TiO 2 nanocrystal sheets is observed (rather than any sequential crystal transformations). This substrate organic functional group-induced crystal formation/transformation approach could be applicable to other material systems.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2017
·
IF 3.012
Anran Liu,Haitao Shan,Mengyao Ma,Li Shangguan,Kunpeng Jiang,Minke Shi,Yuewu Zhao,Songqin Liu,Shufeng Li
Dysregulation of human tumor necrosis factor α (TNF-α) production has been implicated in a variety of human diseases. Serum level of TNF-α is frequently detected in clinical diagnosis of cancer patients. Herein, we present an ultrasensitive photoelectrochemical (PEC) sandwich immunosensor for TNF-α detection by utilizing anti-TNF-α nanobody (Nb) orientedly immobilized to the CdS and Mn cosensitized TiO 2 nanorod arrays electrode. Using highly oriented Nb as receptor molecules and a secondary anti-TNF-α nanobody conjugated with ZnS nanoparticles as the signal amplification element, the PEC immunosensor for TNF-α was developed by monitoring the changes in the photocurrent intensity of the electrode resulting from immunoreaction. The proposed method has the linear range from 2.0 pg/mL to 200 ng/mL and the detection limit was 1.0 pg/mL. The method also reveals high specificity to detect TNF-α, with acceptable intra-assay precision and excellent stability. The results for the detection of ten serum samples from lung cancer patients and normal human have good agreement with the clinical data.
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高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Yakun Tang,Lang Liu,Xingchao Wang,Dianzeng Jia,Wei Xia,Zongbin Zhao,Jieshan Qiu
TiO 2 quantum dots embedded in bamboo-like porous carbon nanotubes have been constructed through the pyrolysis of sulfonated polymer nanotubes and TiO 2 hybrids. The TiO 2 quantum dots are formed during the pyrolysis, due to the space confinement within the highly cross-linked copolymer networks. The sulfonation degree of the polymer nanotubes is a critical factor to ensure the formation of the unique interpenetrating structure. The nanocomposites exhibit high reversible capacity of 523 mAh g −1 at 100 mA g −1 after 200 cycles, excellent rate capability and superior long-term cycling stability at high current density , which could attain a high discharge capacity of 189 mAh g −1 at 2000 mA g −1 for up to 2000 cycles. The enhanced electrochemical performance of the nanocomposites benefit from the uniform distribution of TiO 2 quantum dots, high electronic conductivity of porous carbons and unique interpenetrating structure, which simultaneously solved the major problems of TiO 2 anode facing the pulverization , loss of electrical contact and particle aggregation.
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高影响因子
Journal of the American Chemical Society
·
2017
·
IF 13.858
Fen Liu,Ningdong Feng,Qiang Wang,Jun Xu,Guodong Qi,Chao Wang,Feng Deng
The detailed structure–activity relationship of surface hydroxyl groups (Ti–OH) and adsorbed water (H2O) on the TiO2 surface should be the key to clarifying the photogenerated hole (h+) transfer mechanism for photocatalytic water splitting, which however is still not well understood. Herein, one- and two-dimensional 1H solid-state NMR techniques were employed to identify surface hydroxyl groups and adsorbed water molecules as well as their spatial proximity/interaction in TiO2 photocatalysts. It was found that although the two different types of Ti–OH (bridging hydroxyl (OHB) and terminal hydroxyl (OHT) groups were present on the TiO2 surface, only the former is in close spatial proximity to adsorbed H2O, forming hydrated OHB. In situ 1H and 13C NMR studies of the photocatalytic reaction on TiO2 with different Ti–OH groups and different H2O loadings illustrated that the enhanced activity was closely correlated to the amount of hydrated OHB groups. To gain insight into the role of hydrated OHB groups in the h+ transfer process, in situ ESR experiments were performed on TiO2 with variable H2O loading, which revealed that the hydrated OHB groups offer a channel for the transfer of photogenerated holes in the photocatalytic reaction, and the adsorbed H2O could have a synergistic effect with the neighboring OHB group to facilitate the formation and evolution of active paramagnetic intermediates. On the basis of experimental observations, the detailed photocatalytic mechanism of water splitting on the surface of TiO2 was proposed.
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高影响因子
ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2016
·Vol. 72
·期 1
·153-165
·
IF 2.039
Ma Taowu,Wang Meng,Gong Shuangjiao,Tian Bin
The environmental factors are expected to affect the ecotoxicity of heavy metals in the presence of engineered nanoparticles (NPs) in aquatic ecosystems. However, in sediment scenario, little is known regarding their impacts on the ecotoxicity of co-exposure of sediment-associated heavy metals and NPs. This study evaluated the impacts of different levels of organic matter (OM) (4.8–11.6%) and pH (6–9) on the ecotoxicological effects of co-exposure of sediment-associated titanium dioxide nanoparticles (TiO 2 -NPs) and cadmium (Cd) to a freshwater gastropod Bellamya aeruginosa . The burdens of Ti and Cd and biomarkers of DNA damage, Na + /K + -ATPase, lipid peroxidation (LPO), and protein carbonylation (PC) in the hepatopancreas were determined following 21 days of exposure. At background level of OM (4.8%) in sediments, TiO 2 -NPs significantly promoted Cd accumulation in low-Cd treatments (5 mg/kg) but did not promote Cd accumulation in high-Cd treatments (25 mg/kg). At the relatively higher OM levels (7.1 and 11.6%), TiO 2 -NPs significantly enhanced Cd accumulation and toxicity as evidenced by aggravated DNA damage, decreased Na + /K + -ATPase activities, and increased LPO and PC levels. Moreover, Cd burdens in both low-Cd and high-Cd treatment were positively correlated with corresponding Ti burdens, indicating TiO 2 -NPs partially acted as carrier of Cd. At all pH levels, in low-Cd treatments, TiO 2 -NPs did not affect Cd accumulation, LPO, and PC levels but significantly enhanced DNA damage and slightly facilitated the inhibition of Na + /K + -ATPase activities. In high-Cd treatments, only at pH 9, TiO 2 -NPs significantly enhanced Cd accumulation and toxicity. Our results implied that interaction between TiO 2 -NPs and OM or pH significantly affected the accumulation and toxicity of Cd in B. aeruginosa , but the underlying mechanisms need further investigation. Additionally, it should be noted that the potential ecological risk of co-exposure of NPs and coexisting pollutants might be closely species-specific and related to environmental media.
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JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 24
·期 1
·45-54
·
IF 1.385
Ma Jing,Xu Shangyuan,Chu Jia,Xue Juanqin,Tang Jieli,Qiang Liangsheng
In this paper, a series of metal supported TiO 2 /SBA-16 photocatalysts were successfully synthesized by wet impregnation method. The synthesized samples were characterized by X-ray diffraction (XRD), Raman spectra, N 2 adsorption–desorption, transmission electron microscopy (TEM), UV–visible absorption spectra (UV-vis) and X-ray photoelectron spectroscopy (XPS). It was found that SBA-16 retained the ordered mesostructure after modification. The results shown that loading different metal elements was found to have significant influences on the crystallographic structure and physical properties. Moreover, the prepared materials were evaluated on photodegradation of Rhodamine B (RhB). Experiment results showed that the degradation of RhB by these catalysts follows the pseudo-first-order kinetic model. The effect of metal element on photocatalytic activity can be attributed that the appropriate amounts of metal concentration can enhance the photocurrent due to the reduced electron–hole recombination, which can improve the efficiency of photocatalytic reactions.
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