Desalination and Water Treatment
·
2014
·
IF 0.987
Wenli Zhang,Jiqin Li,Ziyang Lu,Yingying Luo,Fei Chen,Pengwei Huo,Jianming Pan,Yongsheng Yan
Magnetic TiO2 nanocomposites with good monodispersity were successfully synthesized via a mild sol–gel method, which were used for removal of salicylic acid (SA) residues from aqueous solution. These as-prepared nanocomposites were extensively characterized by transmission electron microscopy, scanning electron microscope, N2 adsorption–desorption isotherm with the Brunauer-Emmett-Teller method, Fourier-transformed infrared spectra, X-ray diffraction, and vibrating sample magnetometer. These results indicated that magnetic TiO2 nanocomposites possessed the core-shell structure of good dispersibility, excellent chemical stability, and magnetic property (Ms = 22.11 emu/g). According to the results of series experiments, magnetic TiO2 nanocomposites showed fast kinetics and satisfied adsorption capacity for adsorption of SA. Under the optimum experimental condition, the adsorption process followed pseudo-second-order reaction kinetics and Langmuir adsorption isotherm. Moreover, the thermodynamic parameters calculated from the adsorption data suggested that the adsorption of SA was a spontaneous and endothermic nature of the process. In addition, magnetic TiO2 nanocomposites were proved to exhibit high catalytic efficiency for photodegradation of SA under visible light irradiation, and the intermediate products of photodegradation were inferred from the mass spectrometry.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2019
·Vol. 20
·期 21
·5497
·
IF 4.183
Jingpeng Li,Minglei Su,Anke Wang,Zaixing Wu,Yuhe Chen,Daochun Qin,Zehui Jiang
We developed a novel green approach for the in situ fabrication of Ag NPs in mesoporous TiO2films via the bamboo self-sacrificing reduction of Ag(NH3)2+ions, which can inhibit fungal growth on the bamboo surface. Mesoporous anatase TiO2(MT) films were first synthesized on bamboo via a hydrothermal method. Then, Ag NPs with a 5.3 nm mean diameter were incorporated into the pore channels of optimal MT/bamboo (MTB) samples at room temperature without the addition of reducing agents, such that the Ag NPs were almost entirely embedded into the MT films. Our analysis indicated that the solubilized lignin from bamboo, which is rich in oxygen-containing functional groups, serves as a green reductant for reducing the Ag(NH3)2+ions to Ag NPs. Antifungal experiments withTrichoderma virideunder dark conditions highlighted that the antifungal activity of the Ag/MT/bamboo samples were greater than those of naked bamboo, MTB, and Ag/bamboo, suggesting that these hybrid nanomaterials produce a synergistic antifungal effect that is unrelated to photoactivity. The inhibition ofPenicillium citrinumeffectively followed a similar trend. This newly developed bamboo protection method may provide a sustainable, eco-friendly, and efficient method for enhancing the antifungal characteristics of traditional bamboo, having the potential to prolong the service life of bamboo materials, particularly under dark conditions.Keywords:bamboo;Ag/TiO2nanocomposites;self-sacrificing reduction;antifungal activity
研究领域:
材料科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Ling Ding,Ting Xiong,Zhibo Zhao,Jun Liao,Yong Zhang
In this study, Al 2 O 3 -TiO 2 nanocomposite was in-situ fabricated using cross-linking-freeze-drying technology for the separation of U(VI). Al 2 O 3 -TiO 2 nanocomposite exhibited an excellent removal property for U(VI) with a removal efficiency of 97.5% and a maximum adsorption capacity of 586.7 mg g −1 , which exceeded those of other TiO 2 -based adsorption materials. After five cycles, the removal percentage for U(VI) on Al 2 O 3 -TiO 2 nanocomposite still maintained more than 90.0%. The study of isotherm and kinetic demonstrated that the removal behavior of Al 2 O 3 -TiO 2 nanocomposite for U(VI) was monolayer chemisorption . Furthermore, the results of pH zpc , BET, SEM, FTIR and XPS analysis manifested that the interactions between Al 2 O 3 -TiO 2 nanocomposite and U(VI) included electrostatic interaction, surface complexation, oxygen vacancy chemistry and redox reactions . In one word, Al 2 O 3 -TiO 2 nanocomposite was a potential candidate as adsorbent in U(VI)-bearing wastewater remediation owing to its simple preparation method and the excellent removal properties.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Jinghui Zhan,Huayao Chen,Hongjun Zhou,Li Hao,Hua Xu,Xinhua Zhou
Nano-scale antibacterial agents have attracted enthusiastic attention due to their size-dependent qualities, effective antibacterial activity, and unique physiochemical properties, which showed great application potential in plant protection and nutrition. In this work, Mt-supported ZnO/TiO 2 nanocomposite was prepared through sol-gel assisted impregnation method, and its antibacterial activity against gram-positive bacteria ( S. aureus ) and the wettability on cucumber leaves was investigated. The results suggested that the pillaring of Mt by TiO 2 increased BET specific surface area, improved Zn-dispersion, enhanced adsorption capacity , forming an exfoliation structure of TiO 2 pillared Mt nanocomposite . Besides, Mt-supported ZnO/TiO 2 nanocomposite showed an obvious increase of antibacterial activity and wetting property over pure ZnO and Mt-supported ZnO composite due to the doping of zinc oxide by carbon atoms and the increase of exposed active sites caused by the effective dispersion of ZnO. In addition, the optimal performance was achieved for 15.04% Zn element content with the diameter of the inhibition zone was 48.53 ± 0.1 mm and the contact angle was 82.5 ± 0.2° attributed to the increased BET surface area (72.33 m 2 /g) and metal oxide interaction between TiO 2 and Zn 2+ . The relatively low cost, green and environment friendly, high antibacterial activity, and wettability of Mt-supported ZnO/TiO 2 nanocomposite offers new avenues for the antibacterial agent in the field of agriculture and crop protection.
研究领域:
农业科学
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材料科学
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 23
·15551
·
IF 4.614
Renguo Liu,Xue Li,Jinhui Huang,Haoliang Pang,Qiongfang Wan,Kun Luo,Ya Pang,Lingyu Wang
g-C3N4/Ag3PO4/TiO2nanocomposite materials were loaded onto a polyvinylidene fluoride (PVDF) membrane using a phase inversion method to obtain a photocatalytic flat membrane for dye removal. The morphology, structure, and photocatalytic activity of the g-C3N4/Ag3PO4/TiO2nanoparticles and composite membrane were evaluated. The g-C3N4/Ag3PO4/TiO2/PVDF membrane exhibited superior morphology, hydrophilic properties, and antifouling performance compared with the raw PVDF membrane. Four-stage filtration was performed to evaluate the self-cleaning and antifouling capacity of the g-C3N4/Ag3PO4/TiO2/PVDF membrane. Upon irradiating the composite membrane with visible light for 30 min, its irreversible fouling resistance (Rir) was low (9%), and its flux recovery rate (FRR) was high (71.0%) after five filtration cycles. The removal rate of rhodamine B (RhB) from the composite membrane under visible light irradiation reached 98.1% owing to the high photocatalytic activity of the membrane, which was superior to that of raw PVDF membrane (42.5%). A mechanism of photocatalytic composite membranes for RhB degradation was proposed. Therefore, this study is expected to broaden prospects in the field of membrane filtration technology.Keywords:g-C3N4/Ag3PO4/TiO2nanocomposite;photocatalytic membrane;self-cleaning;membrane fouling;dye
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Feihong Wang,Qi Zhao,Hongpeng Li,Qiangshun Wu,Luyan Zhang,Yan Li,Liang Qiao,Ye Yuan,Jun Ma,Panpan Wang,Tianming Chen
Chlorophenolic pollutants pose serious threats to the aquatic ecosystem. Photocatalysis technology has broad prospects for decontamination. In this work, MXene-derived TiO 2 nanocomposites with mixed-crystal characteristics and oxygen vacancies (OVs) (E–TiO 2 @rGO) were successfully synthesized by atmosphere modulation. Compared with commercial TiO 2 and N 2 –TiO 2 @rGO (anatase phase), the rate constants of E–TiO 2 @rGO (0.06874 min −1 ) over 2,4,6-trichlorophenol (2,4,6-TCP) degradation increased 4 and 1.3 times, respectively. The enhanced photocatalytic performance was attributed to the co-existence of anatase and rutile phases. On the one hand, the mixed-crystal phase narrowed the band gap, broadening the light absorption range. On the other hand, it induced the generation of OVs, which has been demonstrated by DFT calculation. The presence of OVs improved the adsorption and activation of O 2 and H 2 O molecules, beneficial for the formation of active free radicals. In addition, the incorporation of rGO promoted the separation of electron-hole pairs. The Gibbs free energy of 2,4,6-TCP degradation revealed that the OVs and mixed-crystal could reduce the energy barrier of the rate-determining step, thereby boosting the dichlorination efficiency of 2,4,6-TCP. The superoxide free radical ( O 2 − ) was determined as the dominant active species. Finally, a possible mechanism of 2,4,6-TCP degradation with E–TiO 2 @rGO was clarified clearly. The proposed mixed-crystal defect engineering represents a novel strategy in the design and synthesis of photocatalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Mingzhu Zhou,Long Xiang,Yuanxia Quan,Li Li,Xingran Zhang
Many studies aimed to improve the antibacterial ability and applicability of antibacterial surface materials by altering their chemical composition and structure. In this study, we successfully prepared a multifunctional ZnO X /TiO 2 (0< X ≤ 2) nanocomposites by a sol-gel method, which exhibits visible light responsive self-cleaning, antibacterial adhesion, and antimicrobial properties. In the comparison of the three zinc sources, it was found that the ZnO X /TiO 2 prepared with zinc sulfate doping had a water contact angle of only 1.7°, with enhanced hydrophilicity, and exhibited the best photocatalytic activity under visible light, with a removal rate of up to 90.2% of methylene orange (MO). Antibacterial tests revealed the average diameters of the inhibition halos for Escherichia coli and Staphylococcus aureus were 10 and 12 mm, respectively, thereby showing excellent antibacterial activity under visible light. The low photogenerated electron-hole recombination and the high rates of ·OH and ·O 2 - generation through photo-induced interface charge transfer in ZnO X /TiO 2 composite, which is the main reason for enhancing the photocatalytic antibacterial activity under visible light irradiation. Release of Zn 2+ species, resulting in significant antibacterial performance even under dark conditions. This study combines doping and surface modification, introduce abundant surface hydroxyl groups to endow the composite material surface with superhydrophilicity, anti-bacterial adhesion, and antibacterial properties that can meet the needs of clean and antibacterial surfaces in medical.
研究领域:
材料科学
·
生物医学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 12
·12237-12246
·
IF 2.914
Yang Mi,Shi Xianyang
Biosynthesized nanocomposites are attracting growing interests because they are environmentally friendly. Ag 2 S nanoparticles (Ag 2 S NPs) are deposited in situ on the surfaces of TiO 2 nanotubes (TNTs) via Shewanella oneidensis MR-1 to form Ag 2 S/TNT nanocomposites. The prepared Ag 2 S/TNTs nanocomposites are characterized using high-resolution transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and energy-dispersive X-ray spectroscopy. The results show that Ag 2 S NPs smaller than 8 nm are successfully synthesized and fabricated on the TNT surfaces with relatively uniform distribution. The catalytic performance of the Ag 2 S/TNT nanocomposites is evaluated for catalytic reduction in the presence of NaBH 4 and the photocatalytic degradation of 4-nitrophenol (4-NP) under visible light. The Ag 2 S/TNT nanocomposites show excellent catalytic activity and good stability in the 4-NP reduction process. The 4-NP degradation ratio reaches 98.3% in 50 min, and 87% conversion was achieved after eight cycles. The Ag 2 S/TNT nanocomposites also exhibit excellent photocatalytic activity for 4-NP at a rate of 0.69 h −1 , and the complete degradation of 4-NP was observed within 5 h. Therefore, this study offers an environmentally friendly approach to synthesize nanocomposites for practical applications.
研究领域:
环境科学
·
纳米生物学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Feng Sun,Dabing Ge,Guojing Fan
Heavy metal ions in environmental water have posed a significant risk to human health due to their biodegradability and potential accumulation in aquatic organisms. This study proposed the synthesis of a TiO 2 -graphene nanocomposite for the detection of cadmium ions via an electrochemical route. Then, different methods were used to characterize and analyse the features and morphology of the obtained TiO 2 -graphene nanocomposite. Based on the optimization of the electrochemical detection conditions, this nanocomposite material was applied to the detection of Cd(II) in real water specimens from a tourism area. The electrochemical sensor for Cd(II) detection was proved applicable to protect the environment of this tourism area.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 6
·期 3
·1017-1027
·
IF 8.867
Rutao Wang,Shijie Wang,Yabin Zhang,Dongdong Jin,Xinyong Tao,Li Zhang
Sodium-ion-based capacitors and batteries are considered as a low-cost energy storage technology alternative to their lithium-ion counterparts owing to the abundance of sodium in Earth. Their widespread use is however limited by the lack of high-performance electrode materials. In this work, we report that MXenes-Ti3C2 can be oxidized into a Ti-peroxo complex gel at room temperature by simply adding H2O2, from concentrated to dilute. The highly water-soluble property of this gel allows the synthesis of a graphene-supported TiO2 nanocomposite with highly porous nano-/meso-hybrid architecture via a more facile and environmentally friendly way. The unique hybrid architecture of the produced TiO2–RGO nanocomposite results in pseudocapacitive behavior in Na+ charge storage with high reversibility, fast kinetics, long cyclability, and negligible degradation to the parent structure. By incorporating the TiO2–RGO composite as the anode, a novel sodium-ion capacitor is constructed that is capable of operating at a high voltage of 4.0 V and delivering a maximum energy density of 94.7 W h kg−1, which is comparable to lithium-ion based capacitors. The approach reported here could be potentially extended for fabricating a host of MXenes-derived metal oxide nanomaterials or nanocomposites for numerous applications, particularly in view of the expanding MXenes portfolio.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Xiao Wang,Yang Li,Zhiying Li,Shouwei Zhang,Xiaolong Deng,Gang Zhao,Xijin Xu
Considering the poor sensing abilities and high working temperatures for trace triethylamine (TEA) detection, design and fabrication of TEA gas sensors with high sensitivity and low power consumption are still desired. Decorating p-type substrate with n-type semiconductor to form p-n junction is considered to be an effective approach to enhance their sensing abilities. Herein, regular "droplets on salix leaf" like CuO/TiO 2 nanocomposites were designed and successfully synthesized using a two-step method including a water bath treatment and a TiF 4 solution etching process. Surface characterizations indicated that the CuO substrate exhibited a salix leaf like nanosheets structure with massive TiO 2 nanoparticles (about 11 nm) decorated on its surface. Excitingly, gas sensing results showed that the CuO/TiO 2 sensors exhibited a high sensing response of 12.7–5 ppm TEA at a low working temperature (160 °C) and possessed a low detection limit (0.5 ppm). The sensing mechanism was also proposed and attributed to the massive highly dispersed p-n junctions between CuO and TiO 2 nanoparticles, which could significantly change the electrical conductivity and oxygen adsorption abilities. In addition, X-ray photoelectron spectroscopy and Electron paramagnetic resonance measurements confirmed the existence of large amounts of surface oxygen vacancy regions and chemisorbed and dissociated oxygen species, which were beneficial to their gas sensing abilities. This work provides a new strategy to fabricate highly sensitive trace TEA gas sensing materials with low working temperatures, which will also promote the application of p-type gas sensors.
研究领域:
材料科学
·
化学传感器
·
纳米技术
✓ 已验证
DOI
高影响因子
Nanoscale
·
2013
·Vol. 5
·期 5
·2107-2113
·
IF 6.233
Leyong Zeng,Wenzhi Ren,Lingchao Xiang,Jianjun Zheng,Bin Chen,Aiguo Wu
Multifunctional Fe3O4–TiO2 nanocomposites with Janus structure for magnetic resonance imaging (MRI) and potential photodynamic therapy (PDT) were synthesized, in which Fe3O4 was used as a MRI contrast agent and TiO2 as an inorganic photosensitizer for PDT. Their morphology, structure, and MRI and PDT performance were characterized, respectively. Moreover, the location of Fe3O4–TiO2 nanocomposites in MCF-7 cells was also investigated by the staining of Prussian blue and alizarin red, respectively. The results showed that the as-prepared Fe3O4–TiO2 nanocomposites had good T2-weighted MRI performance, and the MCF-7 cells incubated with nanocomposites could be killed under the irradiation of UV light. Compared with traditional organic photosensitizers, TiO2 inorganic photosensitizers could have more stable PDT performance due to their nanoscale size and anti-photodegradable stability. Therefore, the as-prepared Fe3O4–TiO2 nanocomposites could have potential applications as a new kind of multifunctional agent for both MRI and PDT.
研究领域:
生物医学工程
·
材料科学
·
医学影像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）