ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Ling-Feng Shen,Yi-Zhou Zhu,Peng-Fei Zhang,He-Fang Wang
Selectively capturing nanosized titanium dioxide (nano-TiO2) from complex mixtures is a very significant but very formidable task both for enriching the analytical methodology and removing/recycling of nano-TiO2. We presented a novel sustainable strategy for such a task by using the bisphosphonate-functionalized Fe3O4 (BP-Fe3O4) nanoparticles as the highly selective adsorbents toward nano-TiO2. The BP-Fe3O4 exhibited high equilibrium adsorption capacity (Qe) toward nano-TiO2 (2.45 g g–1 for 60 nm anatase TiO2) but negligible Qe toward nano-SiO2 (0.01 g g–1 for 15 nm SiO2). The BP-Fe3O4 also had good adsorption capability toward nano-TiO2 in complex liquid media, or in the solid mixtures containing 10−500 times of coexisting nano-SiO2. This capturing strategy enables the green pretreatment for quantitative analysis of nano-TiO2 in complex real samples with the spike recoveries of 69.9–99.0% and low detection limit of 0.02 ppm. Furthermore, this strategy offers great convenience for identification of the crystal forms and even the morphology of nano-TiO2 existing in complex real samples. Besides, this capturing strategy holds great potential for separating or removing nano-TiO2 from the environment and the sustainable recycling of nano-TiO2.
研究领域:
环境科学
·
纳米技术
·
分析化学
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材料科学
·
可持续化学
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DOI
高影响因子
CHEMOSPHERE
·
2014
·
IF 3.499
Yanjie Li,Chen Yang,Xuetao Guo,Zhi Dang,Xiaoqin Li,Qian Zhang
In this study, humic acids (HAs) from three sources, peat, sediment and straw, used to coat nano-TiO 2 were investigated. The results indicated that HAs isolated from peat were aromatic-rich, whereas those isolated from sediment and straw were aliphatic-rich. The nano-TiO 2 sedimentation experiments indicated that the presence of aromatic-rich HAs was more capable of stabilizing nano-TiO 2 particles than was the presence of aliphatic-rich HAs. This result is because the deionized phenolic groups in the HAs were preferentially adsorbed on the nano-TiO 2 surfaces, which generated a higher charge density on the nano-TiO 2 surfaces and caused stronger repulsive forces among particles. Furthermore, the aromatic-rich TiO 2 -HA complexes exhibited a greater sorption capacity than the aliphatic-rich TiO 2 -HAs complexes and nonlinear phenanthrene sorption because of their higher affinity and the condensed state of aromatic fractions. Note that natural organic matters, such as humic acids, in aquatic environments can not only increase the stability of nanoparticles but can also influence the mobility of hydrophobic organic compounds (HOCs).
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Huaichang Wang,Xiaobo Wang,Mengran Yu,Jianing Li,Juming Liu
As a classical photocatalyst, nano-TiO2 has been widely investigated globally. However, achieving its photocatalytic activity within the spectral range of 400 to 740 nm through a facile approach remains a challenge. Herein, carboxylated carbon species sensitized nano-TiO2 was successfully synthesized by a low-temperature (300 °C) carbonization method using ethanol as carbon source and modifier and commercially available nano-TiO2 as titanium source. The obtained sensitized TiO2 nanoparticles exhibited excellent full visible-light-driven photocatalytic degradation performance. The synthesized TiO2 samples were comprehensively analyzed using a range of characterization techniques. The results indicate that the sensitization of carboxylated carbon species endows the nano-TiO2 with full-visible light spectral response properties and facilitates the separation of photogenerated electron–hole pairs, which leads to excellent full visible-light-driven photocatalytic degradation performance. This study presents a novel strategy for broadening the spectral response and facilitating the industrial scale-up of commercially available nano-TiO2.
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产品关联
DOI
高影响因子
FERROELECTRICS
·
2018
·
IF 0.728
Yuguo Zhuo,Jun Liu,Qingshan Li
Nano-TiO2/MDI-50 based waterborne polyurethane composites were prepared with MDI-50, polypropylene glycol (PPG) and nano-TiO2 as main materials. Nano-TiO2 was modified using r-aminopropyltriethoxysilane (KH550) as modifier in order to improve the dispersion of nano-TiO2 in WPU. The composites morphologies and physical states were investigated using scanning electron microscopy (SEM), thermogravimetry analysis (TG), fourier transform infrared (FTIR) spectroscopy and UV-visible (UV-Vis) spectroscopy. Scanning electron microscopy observations revealed that modified nano-TiO2 has good dispersibility. Results from FTIR and TG suggested that the modified nano-TiO2 had been successfully introduced to the polyurethane molecular chain and the thermal decomposition temperature of nano-TiO2/MDI-50 based waterborne polyurethane composites doubled under the same thermal weight loss. Results from UV-Vis suggested that when 2% of modified nano-TiO2 was added, maximum absorbance of composites were significantly improved and was twice higher than that of pure waterborne polyurethane.
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2012
·
IF 2.103
Fajia Liu,Hu Liu,Xiaoyun Li,Huanyu Zhao,Danping Zhu,Yingying Zheng,Chaorong Li
The antibacterial and photocatalytic PVC film was prepared by doping heteronanostructure of TiO 2 nanowire@Ag nanoparticles. TiO 2 nanowire with 50–60 nm in diameter and 0.1 mm in length was prepared by a hydrothermal method, and Ag nanopartical about 5–10 nm in diameter was grafted on the surface of TiO 2 nanowire evenly in the solution. The antimicrobial ability and the photocatalytic properties of the nano-TiO 2 @Ag/PVC film were systematically investigated by changing the influence factors such as the content of nano-TiO 2 @Ag, pH value and the cultivation condition. It confirmed that the nano-TiO 2 @Ag nanostructure could increase the antibacterial efficiency of the PVC film. Further, nano-TiO 2 @Ag/PVC film also showed enhanced photocatalytic activity to decompose Rhodmine B (RhB).
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产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2017
·Vol. 75
·期 2
·623-635
·
IF 1.43
Zhang Qing,Li Deling,Zhang Hongxia,Su Guixian,Li Guanghui
Poly(lactic acid)/sesbania gum/nano-TiO 2 composites were prepared by melt blending in the mixing chamber of a torque rheometer in this work. The processing rheological properties, mechanical properties, morphologies, thermal properties, and optical properties of the resulting composites were evaluated. Effects of nano-TiO 2 content and plasticizer content on the processing rheological properties and mechanical properties of composites were discussed. Scanning electron microscopy micrographs clearly revealed good dispersion of nano-TiO 2 aggregates in the matrix at the low nano-TiO 2 content, while higher content contributed to easy aggregation within the matrix, which was consistent with the results of mechanical properties, thermal properties, and optical properties. As for the processing rheological properties, a reasonable choice of nano-TiO 2 and plasticizer content should be made depending on the used processing equipment and process.
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产品关联
DOI
高影响因子
Frontiers of Materials Science
·
2020
·Vol. 14
·期 2
·163-176
·
IF 1.747
Zhang Zhiyu,Hu Lixia,Zhang Hui,Yu Liping,Liang Yunxiao
Novel large-sized mesoporous nanofilm-constructed macroporous SiO 2 (LMNCMS) with two sets of well-defined 3D continuous pass-through macropores (pore size of 0.5–1.0 μm, wall thickness of 40–50 nm) was prepared through a dual-templating approach, and used as an advanced support for TiO 2 nanocrystalline photocatalyst. The structural and optical properties of the as-prepared materials were investigated by various characterization techniques in order to explore the connections between catalysts’ features and catalytic performance. The photocatalytic activities were evaluated by degradations of methylene blue (MB) and phenol under the simulated sunlight irradiation. To gain insight into the impact of preparation and operation conditions on photocatalytic degradation processes, experiments were conducted at wide ranges of the TiO 2 loading content, calcination temperature, solution pH, and photocatalyst dosage. Nano-TiO 2 /LMNCMS exhibited high photocatalytic activity and stability. Rapid matter transport, good accessibility of pollutants to TiO 2 and high light harvesting could mainly account for the superior photocatalytic performance. The trapping experiments were performed to identify the main reactive species in the catalytic reactions.
研究领域:
材料科学
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环境科学
·
光催化技术
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DOI
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 152
·期 11
·3453-3464
·
IF 2.936
Zhao Mengqi,Pan Zhiquan,Chen Qingrong,Zhou Hong
Diosgenin is an important intermediate of drugs, the special structure similar to hormone determines its important position in drug synthesis. Diosgenin was generally obtained by sulfuric acid hydrolysis of dioscorea, which produced too much acid wastewater, and caused environmental issues. A new solid acid based on TiO 2 was designed and synthesized through the sulfonation of the prepared TiO 2 , the structure was fully characterized by FTIR, SEM, EDX, XPS and XRD. Under the optimized conditions, the yield of diosgenin reached 30.75%, the value was much higher than that of H 2 SO 4 of the same quality. To explore the factors that affect the yield, the usage amount of the solid acid, the temperature, the solvent volume and the extraction time were taken into the analysis, and the results of the recycling experiments indicated that the prepared solid acid can be used for three time and maintain its high activity. A highly efficient solid acid catalyst for diosgenin extraction from saponins was successfully synthesized, and the extraction method was environmentally friendly. Graphical Abstract
研究领域:
药物化学
·
环境科学
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DOI
高影响因子
Nanomaterials
·
2020
·Vol. 11
·期 1
·60
·
IF 4.324
Xiong Wang,Wenqian Kang,Lin Gao,Guangquan Li,Xuerong Chen,Yi Guo
Porous organic polymers (POPs) have proven to be an efficient support in the olefin polymerization catalyst field. In this paper, nano TiO2beads were used to modulate the pore structure, bulk density, and surface morphology and flowability of the prepared POPs. With the incorporation of the hydrophilic nano TiO2beads, the prepared TiO2/POP supports obtained reasonable specific surface area (100–300 m2/g) and higher bulk density (0.26–0.35 g/mL) and flowability than the pure POP supports. The results show that bulk density of the prepared TiO2/POP particles increased when adding an increased amount of TiO2, and when 37.5% TiO2(weight percent to the total comonomers divinylbenzene (DVB) and 2-hydroxyethyl methacrylate (HEMA)) and 3:1 DVB/HEMA (molar ratio) were added, highly flowable TiO2/POP composites (POP-6 and POP-7) were obtained. With the modulation of the nano TiO2template during the support synthesis, the prepared POP-7 particles successfully achieved a normal distribution with a narrow particle size distribution (PSD) of 0.717 and average particle size of 24.1 μm, a specific surface area (SSA) of 279 m2/g, and relatively high bulk density of 0.30 g/mL. Furthermore, all the prepared TiO2/POP supports obtained higher ethylene polymerization activity than silica gel-supported commercial metallocene catalyst. The immobilized (n-BuCp)2ZrCl2/MAO@POP-7 catalyst exhibited the highest ethylene polymerization activity of 4794 kg PE/mol Zr.bar.h and productivity of 389 g PE/g cat, more than twice that of the commercial counterpart. Even higher catalyst productivity (3197 g PE/g cat) and bulk density of the produced PE (0.36 g/mL) could be obtained in higher ethylene partial pressure at 80 °C for 2 h, and the prepared TiO2/POP catalyst shows no obvious Zr+active sites decay during the ethylene polymerization.
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
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
·
材料科学
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2016
·Vol. 81
·期 3
·850-858
·
IF 1.473
Chen Peng,Liang Xiaoping,Wang Jun,Zhang Di,Yang Shanmin,Wu Weishan,Zhang Wei,Fan Xiaowei,Zhang Dequan
Abstract To develop high performance mixed matrix gel polymer electrolyte, the synergistic effect of blending PVDF (PEO/PVDF weigh ratio of 85:15) and adding nano-TiO 2 (0.5–2 wt.%) to traditional monomer poly (ethylene oxide) was investigated. Thermogravimetric analysis indicated that poly (ethylene oxide)/poly (vinylidene fluoride) blend had an excellent thermal performance. X-ray diffraction analysis revealed that poly (ethylene oxide)/poly (vinylidene fluoride) blend leads to lower crystallinity and the amorphicity of corresponding gel polymer electrolyte increases with increasing nano-TiO 2 concentration. The maximum ionic conductivity (2.12 × 10 −6 and 6.37 × 10 −6 S/cm) of poly (ethylene oxide)/-(TiO 2 ) 0.5 and poly (ethylene oxide)/poly (vinylidene fluoride)/-(TiO 2 ) 0.5 gel polymer electrolyte at room temperature (25 °C) were obtained, respectively. The prepared poly (ethylene oxide)/poly (vinylidene fluoride)-TiO 2 gel polymer electrolyte demonstrated about 2.6 and 1.8-fold increment in the fracture strength as compared to that of poly (ethylene oxide) gel polymer electrolyte and poly (ethylene oxide)-TiO 2 gel polymer electrolyte. The average transmittance of poly (ethylene oxide)/poly (vinylidene fluoride)-TiO 2 gel polymer electrolyte was about 90 % in the visible region. With good electrical, mechanical and optical performance, it is very suitable for being applied in electrochromic glass. Graphical Abstract
研究领域:
材料科学
·
电化学
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DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2018
·
IF 6.042
Hongyan He,Xiuhong Peng,Ying Yu,Zeming Shi,Mo Xu,Shijun Ni,Ying Gao
Photochemical vapor generation (PVG) is emerging as a promising analytical tool for Te determination, thanks to its efficient matrix separation, and simple and green procedure. However, the low PVG generation efficiency of Te is the bottleneck for its wide application in environmental samples containing trace Te. Herein, we reported a high efficient PVG for Te determination by synergistic effect of ferric ion and nano-TiO2. The analytical sensitivity was enhanced approximately 15-fold for Te(IV) in the presence of both ferric ions and nano-TiO2, comparing to conventional PVG. Besides, the use of nano-TiO2 can provide Te(VI) and Te(IV) an equal and high PVG efficiency in the presence of ferric ions, owned to the high photocatalytic performance of TiO2 under short-wavelength UV irradiation (254 and 185 nm). Under the optimized experimental conditions, a detection limit of 1.0 ng L–1 was obtained. The precision of replicate measurements was 2.3% (RSD, n = 7) at 0.5 μg L–1 for Te(IV). The methodology was validated by successful determination of Te in surface waters and two standard reference sediment samples. To our best knowledge, this is the first report of the synergistic enhancement of transitional metal ions and nano-TiO2 in PVG, which possesses potential for highly sensitive determination of vapor-forming elements.
研究领域:
分析化学
·
环境科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）