ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 5
·4997-5007
·
IF 2.914
Zhang Lixin,Rao Lei,Wang Peifang,Guo Xiang,Wang Yuxiong
Herein, we present the preparation of nano-TiO 2 –silicone resin composite films by double liquid phase spray deposition. The films exhibit better adhesion stability and photocatalytic activity under a hydrodynamic erosion condition than conventional nano-TiO 2 composite films. The TiO 2 layer morphology and effective TiO 2 coverage ratio (CR) were affected by the initial curing time (ICT) of the silicone resin, e.g., the increase in an ICT from 10 to 40 min resulted in a CR change from 79.1 to 98.7%. The surface morphology evolution of composite films was studied under a hydrodynamic erosion period of 4 weeks. Obtained results allowed the 4-week evolution to be divided into four stages (pitting, crack pregnant, banded stripping, and surface stripping periods), additionally revealed that the CR of all samples was remained above 65%. The photocatalytic activity of composite films before and after 4-week hydrodynamic erosion was evaluated by rhodamine B degradation experiments. The 4-week erosion only led to the decrease of the photodegradation efficiencies by less than 40% in all cases. Thus, the fabricated TiO 2 –silicone composite films demonstrated excellent durability and photocatalytic activity under the conditions of long-term hydrodynamic erosion, allowing one to conclude that this work paves the way to the fabrication of next-generation photocatalytic materials for industrial applications.
研究领域:
材料科学
·
环境科学
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DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Liangfan Qu,Guiyun Chen,Shuang Dong,Yaoxing Huo,Zhonglin Yin,Shuhong Li,Ye Chen
Highly dispersible TiO 2 nanoparticles were prepared through the hydrolysis of titanium alcohol, and a series of TiO 2 -modified zein/chitosan (CS) films were prepared through a process involving blending, solution casting and evaporation. The mechanical properties and the antibacterial capacity of the zein/CS/TiO 2 films were characterized to explore the effects of different TiO 2 nanoparticle contents. Results showed that the addition of nanoscale TiO 2 remarkably improved the mechanical properties and thermal stability of the zein/CS/TiO 2 film. The tensile strength of the zein/CS/TiO 2 films significantly increased (p<0.05) with the increasing TiO 2 loadings in films, reaching a maximum of 28.33 ± 1.53 MPa at 0.15 wt % TiO 2 nanoparticles. The antibacterial effect of the composite films on Gram-positive bacteria ( S. aureus ) was more significant than that of Gram-negative bacteria ( E. coli and S. enteritidis ), and the antibacterial effect of UV light was better than that of dark conditions. In particular, the inhibition zones of zein/CS/TiO 2 (0.15%) film against E. coli , S. enteritidis and S. aureus under UV light condition increased by 21.78%, 21.45%, and 26.44%, respectively, compared with the control. This study suggested that adding highly dispersible TiO 2 nanoparticles is an effective method for improving the mechanical and antimicrobial properties of zein/CS films for various applications, such as medical and food packaging.
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高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-11
·
IF 4.011
Sun Saiwu,He Huijun,Yang Chunping,Cheng Yan,Liu Yongpan
In this study, the adsorption and UV photocatalytic degradation of atrazine using nano-TiO 2 particles were studied systematically, and the colloidal stability of nano-TiO 2 particles in solution was also investigated to reveal the removal mechanism. Experiments which contained the first 6.0 hours darkness and 4.0 hours UV illumination later were conducted at different concentrations of Ca 2+ and/or fulvic acids (FA) at pH = 7.0. Results showed that the adsorption rate of atrazine onto nano-TiO 2 particles decreased with the increase of Ca 2+ and/or FA concentrations, which could be explained well by the colloidal stability of nanoparticles. When the solution contained Ca 2+ or Ca 2+ -FA, the nanoparticles were aggregated together leading to the decrease of the contact surface area. Besides, there existed competitive adsorption between FA and atrazine on the particle surface. During photocatalytic degradation, the increase of Ca 2+ and/or FA concentration accelerated the aggregation of nano-TiO 2 particles and that reduced the degradation efficiency of atrazine. The particle sizes by SEM were in accordance with the aggregation degree of nanoparticles in the solutions. Sedimentation experiments of nano-TiO 2 particles displayed that the fastest sedimentation was happened in the CaCl 2 and FA coexistent system and followed by CaCl 2 alone, and the results well demonstrated the photodegradation efficiency trends of atrazine by nano-TiO 2 particles under the different sedimentation conditions.
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PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 131
·期 3
·
IF 1.395
Peng Fei,Benhua Fei,Yan Yu,Hanguo Xiong,Jun Tan
In this study, bamboo fiber/high-density polyethylene (HDPE) composites were prepared, and the effects of nano-TiO 2 on their thermal properties and crystallization behavior were investigated via thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The results show that the addition of nano-TiO 2 improved the thermal stability and had a dual function in the crystallization behavior of the composites. On one hand, it functioned as a nucleating agent. The addition of 2 wt % nano-TiO 2 promoted the crystallization, which caused the increase of the crystallization rate and crystallinity degree, as well as the micronization of the crystalline grain. On the other hand, intermolecular hydrogen bonds and covalent bonds were formed between nano-TiO 2 and the polymer matrix, which hindered the crystallization of the composites. When the content of nano-TiO 2 was continually increased, the inhibitory effect of the crystallization was gradually enhanced, which resulted in a decrease in the crystallization rate and crystallinity degree of the composites. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 39846.
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高影响因子
CONSTRUCTION AND BUILDING MATERIALS
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2016
·
IF 2.421
Peng Fei,Hanguo Xiong,Jie Cai,Chao Liu,Zia-ud-Din,Yan Yu
This paper analyzes the impact of rutile nano-titanium dioxide (nano-TiO 2 ) on the weatherability of bamboo fiber/high-density polyethylene (HDPE) composites using xenon-arc weathering accelerated tests. The results showed that a series of performance reduction containing color fading, surface cracking, structural transformations and loss of mechanical properties appeared on the composites during the accelerated weathering process. These attributes could be minimized to a greater extent using rutile nano-TiO 2 . The analysis revealed that, although free-radicals created by nano-TiO 2 after absorbed UV light may resulted in the oxidization of bamboo fiber and HDPE , rutile nano-TiO 2 mainly acted as light screening agent and ultraviolet absorbent, which retarded the photo-oxidative of the composites. Moreover, rutile nano-TiO 2 enhanced the thermal stability by interacting with the molecular chain of bamboo fiber and HDPE which resulted into reduced thermo-oxidative aging of composites.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 5
·1-9
·
IF 1.784
Feng Guyu,Wang Xinyue,Zhang Diantang,Xiao Xueliang,Qian Kun
The performance degradation of polypropylene (PP) fibers which induced by ultraviolet (UV) irradiation are commonly defect in service, especially in the outdoor environment. In this study, ZnO coated nano-TiO 2 with resistance in full range of UV irradiation is prepared by ultrasonic-microwave homogeneous precipitation method. The chemical structure, physical–chemical property, and atomic structure and surface morphology of the ZnO coated nano-TiO 2 are systematically investigated by FTIR, XRD, BET and TEM analysis. The uvioresistant PP fibers are prepared by melting blending method with PP and coated nano-TiO 2 as raw materials. The effect of coated nano-TiO 2 on UV resistance of PP fibers is described by carbonyl index, molecular weight and mechanical property. Results showed that PP fibers with coated nano-TiO 2 exhibited excellent UV shielding effect in full range of UV irradiation.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
COMPOSITE INTERFACES
·
2020
·
IF 2.32
Lele Liu,Piqi Zhao,Shoude Wang,Ning Xie,Han Wang,Valeria Strokova,Lingchao Lu,Xin Cheng
How to give a full play of the photocatalytic performance of TiO2 in coatings has attracted immense academic interests in recent years. A major challenge is the good dispersion, more reactivity area and cost-effective fabrication. Here, TiO2-silica aerogel composite (AG/TiO2) was achieved in one step by silane coupling reaction. And the absorbance test proved that the bonding between them possessed satisfactory mechanical stability. SEM-EDS and BET analysis showed TiO2 could be well dispersed on the surface of AG clusters until it reached the maximum load amount approximate 6 wt%, which was in accordance with the regularity of photocatalytic performance. In the case of the optimum, the RhB degradation rate of AG/TiO2 could reach 82% by UV irradiation for 4 h. Subsequently, AG/TiO2 was mixed with polyacrylate emulsion to prepare photocatalytic functional coating. During the film formation process, the AG/TiO2 particles were supposed to migrate up spontaneously, which was proved by semi-quantitative XPS analysis of Si-dispersion. It would undoubtedly improve the rate of effective utilization of TiO2 in coatings. And the photocatalytic efficiency of RhB could be up to 88% at a low percentage (6%) after 8 h UV illumination. Furthermore, we also proved that the gradient-dispersed AG/TiO2 did not impair the mechanical properties of PAE coating.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 29
·期 3
·799-805
·
IF 1.637
Zhao Piqi,Liu Honghua,Guo Xiangyang,Wang Han,Wang Shoude,Lu Lingchao,Cheng Xin
The bamboo charcoal/nano-TiO 2 (BC/TiO 2 ) composite material is designed and prepared for further improving photocatalytic property of TiO 2 . Assessment of BC/TiO 2 composite material and its application in photocatalytic coating are investigated by nitrogen absorption test, scanning electron microscopy-energy disperse spectroscopy (SEM-EDS) characterization and photocatalytic and mechanical properties analysis. The results show that optimal ratio of TiO 2 to BC is 0.03. Rhodamine B (RhB) degradation ratio can reach 62.9% under 4 h UV light irradiation, which is 43.7% higher than pure TiO 2 sample. The specific surface area (S BET ) and the total average pore size ( \(\overline {D}\) ) of BC/TiO 2 can reach 388.33 m 2 /g and 3.71 nm, respectively. Moreover, the photocatalytic coatings prepared mainly by BC/TiO 2 and polyacrylic emulsion (PAE), not only show satisfactory mechanical properties, but also have excellent photocatalytic property. When the addition of BC/TiO 2 composite materials is 6%, the photocatalytic property of coating is optimal, RhB degradation ratio can reach 83.7% under 8 h UV light irradiation. Also the adhesion, pencil hardness and impact resistance reach 2 level, 2H and 44 kg cm, respectively.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
Journal of Food Measurement and Characterization
·
2025
·
IF 3.3
Zeng Liping,Yang Ruopeng,Deng Qiuhong,Hu Chunyuan,Tian Ruijin,Yang Guangming,Liu Sha,Fan Aiping
This study successfully prepared polylactic acid (PLA) composite films containing Litsea cubeba oil (LCO, 9 wt%) and different concentrations of nano-TiO 2 (0 wt%, 1 wt%, 2 wt%, and 3 wt%), and evaluated their efficacy in preserving fresh-cut jackfruit. The results showed that LCO and nano-TiO 2 could be successfully incorporated into the PLA matrix, which improved the composite films’ structure, flexibility, water and UV resistance, and antioxidant and antimicrobial activities. Notably, the composite film with 2 wt% nano-TiO 2 content exhibited the best overall performance among all the packaging materials. Experiments on fresh-cut jackfruit preservation revealed that the composite films suppressed the proliferation of microorganisms like total bacterial count, mold and yeast, and to varying degrees, inhibited their growth and slowed down the quality deterioration of fresh-cut jackfruit. In addition, composite film with 2 wt% nano-TiO 2 content was the most effective in inhibiting microorganisms, respiratory rate, enzyme activity, and malondialdehyde (MDA) content as well as in maintaining weight loss, color, firmness, flavor, and vitamin C (VC) content, ultimately extended the shelf-life of fresh-cut jackfruit from 6 to 15 days at 10 °C. This work demonstrates the feasibility of bioactive PLA films as safe antimicrobial packaging for tropical fruits.
研究领域:
食品科学与技术
·
高分子材料
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活性包装
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采后保鲜
·
纳米复合材料
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产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Yu Zou,Fenghua Shen,Kaisong Xiang,Lele Liu,Haiyang Chen,Qu Yang,Hui Liu
Graphene oxide (GO) is a widely utilized functional anticorrosive material, whereas the presence of numerous oxygen functional groups on its surface tends to cause agglomeration, leading to decrease in anticorrosive properties. In this study, we designed a modification method by using dopamine and nano-TiO 2 to simultaneously enhance the corrosion resistance and thermal stability of GO. The Tafel curves and EIS tests demonstrate that GO modified with dopamine and nano-TiO 2 exhibits superior corrosion resistance. This can be attributed to the adhesive polydopamine formed through the self-polymerization of dopamine, which wraps around the surface of GO, resulting in better dispersion and uniformity of nano-TiO 2 . Additionally, TiO 2 serving as a passivation film enhances the barrier properties of the material. Furthermore, dopamine and nano-TiO 2 effectively cover the C O groups on GO surface, significantly improving its corrosion resistance. Besides, the thermal stability of GO is enhanced due to nano-TiO 2 possessing excellent thermal stability. The enhancement in both corrosion resistance and thermal stability of GO through dopamine and nano-TiO 2 modification is closely related to the amount of added nano-TiO 2 . This work provides valuable insights for simultaneously enhancing both thermal stability and corrosion resistance of GO.
研究领域:
材料科学
·
腐蚀科学
·
表面化学
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DOI
高影响因子
Materials Today Sustainability
·
2023
·
IF 7.8
A. Shan,Y. Lu,L. Cheng,Z. Hou,D. Xili,Y. Li,J. Liu,H. Ma,J. Yang
Due to the high electronegativity , dissolved O 2 molecules can form strong chemisorption on oxygen-deficient nano-TiO 2 , which can alter the photocatalytic degradation process . Regarding this point, there is a lack of sufficient investigation so far, although there have been many reports on oxygen-deficient nano-TiO 2 . Here, we make the dissolved O 2 adsorbed on the oxygen-deficient nano-TiO 2 by simply stirring for a long time. The characterization and theoretical calculation results show that the chemisorption of O 2 significantly enhances the surface hydrogen bonding and results in a substantial increase in the co-adsorbed H 2 O molecules and –OH groups. The co-chemisorbed oxygen species promote the separation of electron-hole pairs, meanwhile accelerate the migration and accumulation of holes to the surface, which effectively enhances the direct oxidation of photogenerated holes. The findings of this work suggest that for long continuous reactions, the role of chemisorbed dissolved O 2 molecules on the photocatalytic degradation activity of oxygen-deficient nano-TiO 2 has to be considered.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 11
·e53618
·
IF 3
Datuan Li,Xingxu Gao,Min Cao,Lei Sheng,Ling Yang,Xin Xie,Yun Gong,Qingyang Hu,Qiangqiang Xie,Tao Wang,Jianping He,Xianli Huang
Traditional polyolefin separators cannot guarantee safety for lithium-ion batteries at high temperature due to their low melting point, especially for high power discharge. Therefore, it is imperative to develop separators with excellent thermal stability. In this paper, we have prepared TiO 2 modified PVDF composite separators by electrospinning. When compared with commercial PE separators, this kind of composite separators show superior thermal stability at 160°C. In addition, it is found that the 0.5-TiO 2 @PVDF separator exhibits excellent flame retardant and optimal tension strength. Meanwhile, the 0.5-TiO 2 @PVDF separator exhibits ideal liquid electrolyte storage capacity, which improves the ionic conductivity (0.68 mS cm −1 ). As a result, the LiCoO 2 ||Li cells with 0.5-TiO 2 @PVDF separator have high discharge capacity retention rate at a current density of 1 C (300 cycles) and excellent rate performance (1.75 mAh at 5 C). In short, nano-TiO 2 modified PVDF separator has a great application prospect in high-performance and high-safety lithium-ion batteries.
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高影响因子
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