JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Tao Ke,Shuyi Shen,Krishnamoorthy Rajavel,Kun Yang,Daohui Lin
Construction of heterojunction and nitrogen doping is an effective approach for synthesizing photocatalysts with high quantum yield and efficient electron-hole separation. 2D MXene Ti 3 C 2 has been considered a good carbonaceous nanomaterial for designing heterojunction, while the original surface groups and stacked structure limit the electron-hole separation. Herein, a hybrid of nitrogen-doped Ti 3 C 2 nanosheets and TiO 2 nanoparticles (NPs) composed of TiO 2 NPs in situ growing on isopropyl amine (iPA) modified Ti 3 C 2 (iN-Ti 3 C 2 ) was developed for the first time. The novel iN-Ti 3 C 2 /TiO 2 hybrid exhibited an excellent ultraviolet-light photodegradation of methylene blue (MB), with a degradation rate (0.02642 min −1 ) significantly higher than that of pure TiO 2 NPs, bulk-Ti 3 C 2 /TiO 2 , dimethyl sulfoxide modified Ti 3 C 2 /TiO 2 hybrid, and hydrazine monohydrate modified Ti 3 C 2 /TiO 2 hybrid. The formation of heterojunction between iN-Ti 3 C 2 and TiO 2 and its role in the photocatalysis were systematically analyzed using various characterization techniques and density functional theory calculation. The iPA modification exfoliated Ti 3 C 2 and doped N on Ti 3 C 2 nanosheets; the in situ grown TiO 2 NPs formed efficient heterojunctions with the nanosheets; the N-doping facilitated electron migration in Ti 3 C 2 and inhibited the recombination of photogenerated electron-hole pairs; •OH dominated the photodegradation of MB. This work provides a new approach of constructing efficient photocatalysts for the treatment of organics-polluted water.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2020
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IF 3.594
Qing Shan,Yong Liu,Xinlei Zhang,Jinfa Shao,Daqian Hei,Yongsheng Ling,Wenbao Jia
In this work, the biological enrichment of TiO 2 nanoparticles (NPs) by Salvinia natans was studied, and the EDXRF technology was used to evaluate the ability of Salvinia natans to enrich TiO 2 NPs. At the same time, with the accumulation of TiO 2 Nps in Salvinia natans, the changes of nutrient elements (P, S, Ca, Fe, and Zn) in its leaves and root tissues of Salvinia natans were observed simultaneously. The experimental results indicate that the Salvinia natans showed a strong potential to enrich the TiO 2 NPs. It had accumulated about 14.9 mg/g and 2.2 mg/g of titanium in roots and leaves when they were cultured in the highest TiO 2 NPs concentration (20 mg/L) to saturation. By calculating the bioconcentration factors (BCF), the enrichment ability of TiO 2 NPs in S. natans was evaluated. It was found that the enrichment effect of Salvinia natans on TiO 2 NPs showed negative correlation with the culture concentration. As to nutrient elements, the contents of P, S, and Ca in the roots and leaves were significantly increased with the increase of Ti enrichment. It might mean that the TiO 2 NPs have a positive effect on the growth and development of Salvinia natans. Besides, the reduction of Fe might indicate that the absorption of TiO 2 NPs affects the bioaccumulation of metal ions in Salvinia natans.
研究领域:
环境科学
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植物学
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DOI
高影响因子
International Journal of Nanomedicine
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2023
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IF 8
Wenshu Cheng,Xinyue Xu,Yuanyuan Lang,Zugen Cheng,Mohammad Rizwan,Xiaomin Tang,Lixin Xie,Yanling Liu,Hengyi Xu,Yang Liu
Purpose To evaluate the effects of anatase and rutile TiO2 nanoparticles (NPs) on the growth and development of bones in young rats and explore their possible mechanisms.Methods Three-week-old male rats were orally administered anatase TiO2 NPs and rutile TiO2 NPs for 28 days. The indicators of rat growth and development, liver function, bone metabolism, and insulin-like growth factor-1 (IGF-1) levels were evaluated. Micro-computed tomography (micro-CT) and immunohistochemistry were used to evaluate the tibia.Results No significant differences were observed among growth and development indicators in young rats. Significant differences were found in IGF-1 levels, phosphorus levels, and liver function. Micro-CT revealed osteoporosis in the bones. The micro-CT data supported the same result. Bone immunohistochemistry results showed that the expression of osteoprotegerin (OPG) was decreased and the expression of receptor activator of nuclear factor-κB ligand (RANKL) and cathepsin K (CTSK) was increased.Conclusion This study demonstrated that TiO2 NPs can damage bones via the IGF-1/OPG/RANKL/CTSK pathway in young rats. Furthermore, rutile TiO2 NPs damaged the bones more seriously than anatase TiO2 NPs.
研究领域:
纳米技术
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生物材料
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骨骼生物学
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毒理学
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产品关联
DOI
PubMed
高影响因子
POLYMER ENGINEERING AND SCIENCE
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2024
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IF 3.2
Xiaohui Wang,Xinmei Li
To address the escalating issue of oily wastewater, separation membranes with special wettability on the surface are widely used in oil–water separation. The development of separation membranes with not only stable separation flux but also anti-fouling properties is an urgent problem. Therefore, polystyrene/polyacrylonitrile-polyvinylidene fluoride/polydimethylsiloxane-titanium dioxide nanoparticle (PS/PAN-PVDF/PDMS@TiO 2 ) composite membranes with superhydrophobicity and lipophilicity were prepared by electrospinning technique. By changing the doping amount of TiO 2 nanoparticles, the multilevel rough structure was constructed on the surface, and the transformation of the Ti–O–C chemical bond to the Si–O–Ti chemical bond was realized inside the composite membrane. The results showed that the composite membrane had excellent superhydrophobicity (154.9°) and mechanical properties (tensile strength of 3.54 MPa, elongation of 60.95%). The membrane can absorb ultraviolet light and exhibits enhanced resistance to fouling when exposed to visible-UV light. Additionally, the composite membrane demonstrates an adsorption capacity of 30–100 g/g for a wide range of oils. In corrosive environments, the composite membrane maintains superhydrophobicity (above 150°) and achieves high oil–water separation efficiency (97%). After 40 cycles, the separation flux of 6000 L.h −1 m −2 can be maintained. Hence, superhydrophobic oleophilic composite membranes with a stable separation flux and resistance to fouling can be employed in the field of oil–water separation. Highlights PS/PAN-PVDF/PDMS@TiO2 composite membrane with multilevel rough structure. PS/PAN-PVDF/PDMS@TiO2 composite membrane with excellent UV absorption and self-cleaning ability. PS/PAN-PVDF/PDMS@TiO2 composite membrane with stable oil–water separation efficiency in harsh environments.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yangyang Dai,Tian Fang,Shumin Li,Yuanyuan Wang,Suyue Zhong,Wenjun Su,Jian Li
While mixed matrix membranes (MMMs) containing two-dimensional (2D) layered materials (such as, GO, g-C 3 N 4 and MXene , etc.) have revealed potential application prospects for gas separation applications, it still faces a serious challenge to enhance the performance of CO 2 separation. Owing to the structural defects of g-C 3 N 4 nanosheets produced during the exfoliation process, which has greatly reduced the gas selectivity. Herein, we describe the construction of g-C 3 N 4 -MXene/Pebax MMM composed by MXene modified the structural defects in g-C 3 N 4 nanosheets to surmount the low gas selectivity of g-C 3 N 4 membrane. However, the stacking of nanosheets on each other hinder the gas transport channels. The TiO 2 nanoparticles derived in-situ from MXene semi-oxidation can support an intermediate layer between g-C 3 N 4 nanosheet and MXene nanosheet to expand the gas transport channels. Eventually, a novel g-C 3 N 4 -TiO 2 @MXene/Pebax MMM was obtained that exhibited maximum CO 2 permeability of 1673.69 Barrer in separation of CO 2 /CH 4 , CO 2 /N 2 selectivity of 45.13, and CO 2 /CH 4 selectivity of 47.76, exceeding the bond 2008 limit on Robeson. What's more, the MMM within 100 h (1 bar and 298 K) are measured to have outstanding separation performance. Overall, this concept offers a novel strategy to enhance CO 2 separation by MXene modified defects in g-C 3 N 4 nanosheets.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2014
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IF 3.163
Bin Xia,Bijuan Chen,Xuemei Sun,Keming Qu,Feifei Ma,Meirong Du
The toxicity of TiO 2 engineered nanoparticles (NPs) to the marine microalga Nitzschia closterium was investigated by examining growth inhibition, oxidative stress and uptake. The results indicated that the toxicity of TiO 2 particles to algal cells significantly increased with decreasing nominal particle size, which was evidenced by the 96 EC 50 values of 88.78, 118.80 and 179.05 mg/L for 21 nm, 60 nm and 400 nm TiO 2 particles, respectively. The growth rate was significantly inhibited when the alga was exposed to 5 mg/L TiO 2 NPs (21 nm). Measurements of antioxidant enzyme activities showed that superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) activities were first induced and subsequently inhibited following exposure to 5 mg/L TiO 2 NPs. The depletion of antioxidant enzymes with a concomitant increase in malondialdehyde (MDA) levels and reactive oxygen species (ROS) posed a hazard to membrane integrity. A combination of flow cytometry analysis, transmission electron microscopy and Ti content measurement indicated that TiO 2 NPs were internalized in N. closterium cells. The level of extracellular ROS, which was induced by TiO 2 NPs under visible light, was negligible when compared with the intracellular ROS level (accounting for less than 6.0% of the total ROS level). These findings suggest that elevated TiO 2 nanotoxicity in marine environments is related to increased ROS levels caused by internalization of TiO 2 NPs.
研究领域:
环境科学
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毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
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2023
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IF 3.9
Qiong Li,Jing Wen,Ziyi Yan,Hang Sun,Erqun Song,Yang Song
Humans may intendedly or unintendedly be exposed to nanomaterials through food, water, and air. Upon exposure, nanomaterials can pierce the bloodstream and translocate to secondary organs, including the brain, which warrants increased concern for the potential health impacts of nanomaterials. Due to their large surface area and interaction energy, nanomaterials can adsorb surrounding proteins. The misfolding and self-aggregation of amyloid-β (Aβ) have been considered significant factors in the pathogenesis of Alzheimer’s disease. We thus hypothesize that brain-targeted nanomaterials may modulate Aβ aggregation and cause related neurotoxicity. Here, we showed that TiO2 nanoparticles (NPs) and their aminated analogue (TiO2-NH2 NPs) adsorb the Aβ42 peptide and accelerate its early oligomerization. Molecular dynamics simulation indicated that the adsorption onto TiO2 NPs and TiO2-NH2 NPs surfaces can stabilize the β-sheet-rich conformations formed by the Aβ42 peptide. The binding sites between TiO2-NH2 NPs and the Aβ42 oligomer surface were mainly concentrated in the hydrophobic core region, and the β-sheet conformation spontaneously formed by Aβ42 oligomers can be better stabilized through a hydrogen bond, electrostatic attraction, and hydrophobic interaction. This study will further help in the understanding of nanomaterial-related neurotoxicities and the regulation of their applications.
研究领域:
生物医学
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纳米毒理学
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蛋白质化学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2022
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IF 11.357
Jing Li,Jiawei Dong,Yanshan Huang,Jiana Su,Yu Xie,Yundang Wu,Wei Tang,Yongtao Li,Weilin Huang,Chengyu Chen
Dermal penetration potentials of titanium dioxide nanoparticles (TiO2 NPs) may be affected by aggregation upon contact with sweat. This study investigated the aggregation kinetics of three TiO2 NPs in thirty human sweat samples and four artificial sweat standards. Effects of particle concentration, sweat type, and inorganic (sodium chloride, disodium hydrogen phosphate, and sodium dihydrogen phosphate) and organic (l-histidine, lactic acid, and urea) constituents were examined. Three TiO2 NPs remained colloidally stable in >20/30 human sweat samples and showed significant negative correlations (P < 0.01) between aggregation rates and |zeta potentials|. They aggregated rapidly over 20 min to >750 nm in three artificial sweat standards, while remained more stable in the International-Standard-Organization-pH-5.5 standard. Aggregation behaviors of three TiO2 NPs mostly followed the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory, allowing for determining their critical coagulation concentrations in inorganic constituents (15–491 mM) and Hamaker constants (3.3–7.9 × 10–21 J). Higher concentrations of particles, inorganic constituents, and l-histidine destabilized three TiO2 NPs, whereas urea inhibited aggregation. Three TiO2 NPs adsorbed organic sweat constituents via complexation with amino or carboxyl groups, with isotherms following the Langmuir model. Correlation analyses further suggested that the adsorbed organic constituents may stabilize three TiO2 NPs against aggregation in sweat by steric hindrance.
研究领域:
毒理学
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纳米科学
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环境健康
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产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
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2024
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IF 8.9
Xuan Luo,Zepeng Pu,Haowei Li,Enyan Zhao,Xiaohui Yang,Aiping Fu,Xuehua Liu,Yu-Guo Guo,Hongliang Li
Lithium‑sulfur batteries (LSBs) with a high theoretical specific capacity are considered as one of the most promising energy storage devices for next-generation. However, issues such as the insulation of pristine sulfur, the shuttle effect of polysulfides (LiPSs), and the volume change of sulfur cathode during cycling hinder their commercial applications. In this work, composite microspheres of TiO 2 @p-C consisting of porous carbon decorated with TiO 2 nanoparticles, have been designed and synthesized aiming to confine and trap the polysulfides inside the porous substrates and to improve the kinetics of the electrochemical reaction therein. TiO 2 particles with size of a few nanometers are prepared by a tetraethyl ammonium hydroxide assisted sol-gel method. Composite microspheres of TiO 2 @p-C are created through spray drying technique using chitosan as carbon source, and nanoparticles of SiO 2 with TiO 2 as co-template while selectively etching of the former. The confinement effects via the pores in the TiO 2 @p-C microspheres and the affinity between the polar TiO 2 moieties and the polysulfide species work synergistically, alleviating the effusion of the polysulfides and promoting the conversion reaction of them as well. As a result, the shuttle effect of polysulfides can be inhibited obviously. Significantly, the S@TiO 2 @p-C-2 composite cathode exhibits excellent cyclic performance of 1263 mAh g −1 at 0.2C and maintains still a discharge capacity of 809 mAh g −1 after 100 charge and discharge cycles. At a current density of 2C, it still delivers an outstanding specific capacity of 772 mAh g −1 . In the case of high sulfur load up to 90 wt%, the discharge capacity of S@TiO 2 @p-C-2 composite electrode could still maintain at 469.5 mAh g −1 after 100 cycles under current density of 0.2C.
研究领域:
材料科学
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能源存储技术
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
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2024
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IF 5.7
Qiang Wu,Xuan Wang,Yixin Li,Junhao Zhou,Ziqiang Liu,Maolin Sun,Xiaolong Lu,Chunrui Wu
Electrospun nanofiber membranes show significant advantages and potential in membrane distillation (MD) technology due to their high water flux and low mass transfer resistance. However, their further development is limited by the unsatisfactory pore size distribution and insufficient hydrophobicity that makes them prone to wetting. Hence, we prepared TNPs/PDMS colloidal particles by combining TiO 2 nanoparticles (TNPs) and polydimethylsiloxane (PDMS) by a simple method with electrospun nanofiber membranes as the support layer, and prepared nanofiber membranes with dense superhydrophobic skin layer by depositing them on the membrane surface by vacuum filtration. The membrane obtained under optimal conditions had a reduced average pore size of 0.37 μm from 0.84 μm in the original membrane and had a water contact angle higher than 160° and a sliding angle less than 20°, which gave it a liquid entry pressure (LEP) of 1.58 bar. It has shown impressive resistance to wetting when treating 3.5 wt% NaCl solution containing 0.1–0.4 mM SDS and natural seawater . In addition, it has a durability of up to 60 h, a high water flux of 38.7 kg·m −2 ·h −1 , and a retention rate of more than 99.99%.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
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2024
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IF 3.7
Yunwu Yu,Yan Wu,Yong Yuan,Yan Wang,Changwei Xu,Yanfeng Fang,Yaxin Gu,Peng Liu,Ye Wan,Lihua Wang,Xiaowei Sun
Based on the previous study, the properties, separation efficiencies, and anti-fouling performances of TiO 2 nanoparticle embedded PEEKWC/PEI cross-linked ultrafiltration membrane made via non-solvent-induced phase separation were investigated. SEM, contact angle measurement , ATR-FTIR, and other methods were used to characterize the membranes, and then the pure water flux (PWF) and dye rejection were measured. The TiO 2 nanoparticle embedded PEEKWC/PEI cross-linked ultrafiltration membranes were prepared by stepwise solution blending method. Compared to the pristine PEEKWC/PEI cross-linked ultrafiltration membrane, the anti-fouling and pure water flux performances were enhanced as the addition of TiO2 nanoparticles. The pure water flux of TiO 2 nanoparticle embedded membranes was significantly increased and could even reach 3368.2 LMH at 5 bar much greater than that of the pristine PEEKWC/PEI ultrafiltration membrane (1423.8 LMH), remaining a retention rate for BBR higher than 98.5%. And the TiO 2 nanoparticle embedded PEEKWC/PEI cross-linked ultrafiltration membranes exhibited a certain degree of increase of FRR (higher than 80%) after UV illumination. After a series of characterisation, the dye wastewater treatment property of membranes was assessed through filtration of Coomassie brilliant blue and Congo red solutions and researches were conducted on the anti-fouling capabilities of membranes. The TiO 2 nanoparticle embedded PEEKWC/PEI cross-linked ultrafiltration membranes exhibited self-cleaning efficiency with lower irreversible fouling ratio. The pure water flux recovery ratio following dye fouling was higher after being exposed to UV irradiation, which could be attributed to the TiO 2 nanoparticles' photocatalytic destruction of organic pollutants .
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
Bioactive Materials
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2020
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IF 8.724
Yawei Ren,Yajing Han,Zhaoyang Li,Xiangmei Liu,Shengli Zhu,Yanqin Liang,Kelvin Wai Kwok Yeung,Shuilin Wu
Bacterial infection and related diseases are threatening the health of human beings. Photocatalytic disinfection as a simple and low-cost disinfection strategy is attracting more and more attention. In this work, TiO 2 nanoparticles (NPs) were modified by co-doping of Ce and Er using the sol–gel method, which endowed TiO 2 NPs with enhanced visible light photocatalytic performance but not pure ultraviolet photocatalytic properties compared the untreated TiO 2 . Our results disclosed that as the doping content of Er increased, the photocatalytic activity of modified TiO 2 NPs initially increased and subsequently decreased. The same trend occurred for Ce doping. When the doping dose of Er and Ce is 0.5 mol% and 0.2 mol%, the 0.5Ce0.2Ti–O calcined at 800 °C presented the best antibacterial properties, with the antibacterial efficiency of 91.23% and 92.8% for Staphylococcus aureus and Escherichia coli , respectively. The existence of Er ions is thought to successfully turn the near-infrared radiation into visible region, which is easier to be absorbed by TiO 2 NPs. Meanwhile, the addition of Ce ions can effectively extend spectral response range and inhibit the recombination of electrons and holes, enhancing the photocatalytic disinfection activity of co-doped TiO 2 .
研究领域:
材料科学
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微生物学
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光催化技术
✓ 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）