ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 7
·18522-18534
·
IF 5.19
Wang Teng,Meng Zhaofu,Liu Lin,Li Wenbin
Titanium dioxide (TiO 2 ) nanoparticles interact with organic–inorganic pollutants in the environment, and these interactions affect their environmental behavior. The mechanisms of the interaction between TiO 2 and organic–inorganic pollutants on the surface of clay minerals are still unclear. In this work, isotherm adsorption was studied to explore the interactions between Cd 2+ /tetracycline (TC), TiO 2 nanoparticles, and a zeolite (Zeo). SEM, FT-IR, and XPS were also used to reveal the interaction mechanism between organic–inorganic pollutants and TiO 2 on their stability and mobility in the environment. Compared to the single systems, the adsorption of Cd 2+ and TiO 2 in the Cd + TiO 2 composite system decreased by 3.43% and 9.90%, respectively; the TC and TiO 2 adsorption in the TC + TiO 2 composite system decreased by 14.39% and 45.47%, respectively. The antagonism between Cd 2+ and TiO 2 was due to Cd 2+ and TiO 2 competing for the electrostatic attraction (-OH) and hydrogen bonding sites (Si–O), and TC and TiO 2 competing for the hydrogen bonding sites (-OH and C = O) on Zeo. The presence of TiO 2 will increase the mobility of Cd 2+ and TC on a clay surface, and this effect is more significant for organic pollutants TC. Compared with Cd 2+ , TC has a more significant boosting impact on the TiO 2 mobility.
研究领域:
环境科学
·
纳米技术
·
表面化学
·
污染科学
·
粘土矿物学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 60
·期 15
·2298-2308
·
IF 3.046
Zhaolai Huang,Jiaqi Li,Mengxiao Zhang,Weilin Feng,Chuanjie Fang,Liping Zhu
Polymers of intrinsic microporosity (PIMs) are promising materials for membrane separation because their special rigid and contorted structures contribute to high permeability. However, their chain rearrangement to fill excessive free volume makes the permeability stability a tough challenge. In this work, we report on a new use of rutile nano-TiO 2 to mitigate the physical aging of PIM-1 (a typical PIM) nanofilms for stable permeability by mixing matrix. It was shown that the PIM-1 membrane incorporated with nano-TiO 2 displayed remarkably higher aging resistance with a lower swelling degree in long-term ethanol soaking, having more stable ethanol permeance with only a 5% decrease after 35 days, lower than 25% of the pure one. The mechanism of anti-aging was revealed by molecular simulation, thermal, tensile mechanical, and dynamic mechanical analysis. It was found that nano-TiO 2 had good compatibility with PIM-1 due to strong coordination interaction, making its uniform dispersion in polymer. Additional solvent permeation channels were also created to increase solvent permeance without compromising solute rejection. Due to the reliable interaction of nano-TiO 2 , which makes particles serve as physical crosslinking points, the movement of PIM-1 chains was limited partially to mitigate aging, enabling PIM-1-based membranes to have robust solvent permeation. Graphical
研究领域:
材料科学
·
化学工程
·
高分子科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yan Yang,Xiqing Xu,Jianxiong Zhao,Bin Wang,Cui Li,Xia Chen,Fang Xu
Saturation magnetization (4π M s ) and ferromagnetic resonance linewidth ( ΔH ) are vital parameters for microwave devices application. The material with high 4π M s and low ΔH is available in microwave frequency. In this work, to synthesize a ferrite material applied to X band, high saturation magnetization LiZnBi ferrite ceramics were selected as matrix. Further, in order to reduce magnetic loss of the LiZnBi ferrites sintered at low temperatures, various nano-TiO 2 were added. Interestingly, the nano-TiO 2 can promote grains growth and suitably enhance saturation magnetization and lower coercivity at low sintering temperature . Meanwhile, the ferromagnetic resonance linewidth ( ΔH ) of the ferrites can also be reduced by introducing more nano-TiO 2 particles. At last, a nano-TiO 2 substituted LiZnBi ferrite ceramics (x = 0.25) with high saturation magnetization (4π M s = ∼3367 G), low coercivity ( H c = ∼146.2 A/m) and low ferromagnetic resonance linewidth ( ΔH = ∼192 Oe) were obtained at 880 °C. The ferrite material is serviceable for X band microwave devices, such as phase shifter and circulator.
研究领域:
材料科学
·
电气工程
·
微波技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Ze Li,Zhen-Liang Xu,Ben-Qing Huang,Yu-Xuan Li,Ming Wang
Superior anti-fouling property, excellent mechanical strength, high flux and rejection of the membrane are essential for the separation of oil/water emulsions. In this work, a crack-free TiO 2 layer was fabricated on the inner surface of three-channel stainless steel hollow fiber (TCSSHF) membrane, which was coated with nano-TiO 2 particles suspension and polyvinyl alcohol (PVA) solution and then calcined at 500 °C. The prepared nano-TiO 2 modified three-channel stainless steel hollow fiber (TiO 2 -TCSSHF) membrane was systematically characterized by scanning electron microscopy (SEM), pore size distribution, water contact angle and dynamic underwater oil-adhesion measurement. TiO 2 -TCSSHF membrane showed a permeation flux of 760 L m −2 h −1 and a rejection of 99.8% for the separation of 5000 ppm vegetable oil/water emulsion at 0.10 MPa. The membrane also showed the superior fouling resistance and recyclability. Therefore, TiO 2 -TCSSHF membrane provided a promising potential for the practical application of the oil/water emulsion separation.
研究领域:
膜科学
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环境工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 29
·18393-18403
·
IF 10.7
Fengjie Zhang,Wenhao Fang,Xiangkun Wu,Xingmei Lu
Currently, addressing the challenges posed by the low energy density of lithium titanate (LTO), a prevalent anode material in lithium slurry batteries (LSBs), is crucial for ensuring high stability, storage capacity, and cycle stability, thereby facilitating the commercialization of LSBs. In this study, a heterostructure (LTO-TOB) was created by integrating nano-TiO2(B) (bronze phase) onto the surface of commercial LTO. The coated TiO2(B) layer significantly increases the specific surface area and wettability, guaranteeing fantastic stability. The pseudo-capacitance lithium storage ability of TiO2(B) boosts the power of the electrochemical reaction. The extra interface in the crystalline phase and the presence of oxygen vacancies serve not just as lithium storage sites, but also accelerate the Li+ diffusivity and enhance the electron conductivity. Furthermore, the diffusion mechanism of lithium ions within LTO-TOB anolyte was examined by using a designed in situ Raman cell. The engineered LTO-TOB anolyte assembled reactor boasts a substantial specific capacity of 209.12 mA h g−1 at 0.5C, coupled with remarkable cycle steadiness (with a mere 0.095% capacity loss per 100 cycles). The reactor exhibits favorable electrochemical characteristics in both intermittent mode and static long-term cyclic mode, thereby highlighting the significance of surface heterostructure modification as a key approach in advancing the progress of LSBs.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Yanli Zheng,Xiaoyu Jia,Zhiyong Zhao,Yalin Ran,Meijun Du,Haiyu Ji,Yanfang Pan,Ziqin Li,Xiaowei Ma,Yue Liu,Lihua Duan,Xihong Li
Poly (butylene adipate- co -terephthalate) (PBAT)/polylactic acid (PLA) blended with compatibilizers (polycaprolactone, PCL; poly (ethylene glycol), PEG; titanium dioxide, nano-TiO 2 ) ( [email protected] composites) were developed by melt processing. Natamycin incorporated into [email protected] blend composites formed [email protected] films, which exhibited high tensile strength (24.1–43.5 MPa) and elongation at break (85.8–258.2 %), and exhibited good oxygen permeability, water vapor permeability, surface hydrophobicity and biodegradability. The in vitro results revealed that inhibition of Penicillium expansum cell growth of the [email protected] films with addition of 1.0 wt% natamycin reached 95.72 %. The [email protected] film with natamycin effectively reduced incidence of decay (1.52 %) on grapes, maintained their quality, and inhibited the growth of pathogenic fungi to up to 0.42 log cfu·g −1 . This study generates new insights into the preservation properties of antimicrobial [email protected] film, which endow it with great application potential as a novel and eco-friendly packaging material for the food industry.
研究领域:
材料科学
·
食品科学
·
生物技术
·
包装技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Biophysics
·
2021
·Vol. 16
·期 4
·460-473
·
IF 3.114
Zhang Xiuling,Li Zhen,Ji Run,Li Kun,Zhang Wentao
Biodegradable composite films based on pullulan/carboxymethyl cellulose/nano-TiO 2 were prepared using a solution casting method. In this study, the composite films were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM), and their physical, mechanical and antimicrobial properties were investigated. FTIR and XRD results confirmed that the presence of nano-TiO 2 could enhance the interaction between the film matrix. SEM analysis revealed that the composite films had a homogeneous network structure, and good particle dispersion could be obtained when the nano-TiO 2 particle content was low. DSC results indicated that the composite films possessed good thermal stability. The incorporation of nano-TiO 2 increased the thickness and contact angle while significantly decreasing the water solubility ( p < 0.05). As the content of nano-TiO 2 increased, the water vapor and ultraviolet visible (UV–Vis) light barrier properties of composite films were significantly improved ( p < 0.05). Mechanical analysis demonstrated that the tensile strength of the composite films first increased and then decreased, whereas the elongation at break decreased significantly ( p < 0.05). In addition, the composite films exhibited excellent activity against Escherichia coli and Staphylococcus aureus mainly due to the inactivation of bacteria by nano-TiO 2 photocatalysis. Preservation experiments showed that the composite films could decrease the weight loss significantly and maintain the firmness, titratable acidity, vitamin c and skin color of strawberries, thereby improving the overall quality of strawberries and extending their shelf life. This finding suggested that pullulan/carboxymethyl cellulose/nano-TiO 2 composite films possessed excellent potential for application in food packaging.
研究领域:
材料科学
·
食品科学
·
生物技术
·
化学
·
农业工程
✓ 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）