JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Liwen Qiang,Nan Zhao,Kaizhen Liao,Xichao Sun,Qiang Wang,Hangbiao Jin
Engineered nanoparticles (ENPs) can resist heavy metal toxicity in plants, but their coexposure still exhibits toxicity to plants compared to plants without exposure to ENPs and heavy metals. There have been few studies on the toxic mechanism of nano TiO 2 -heavy metal coexposure and the effect mechanism of nano TiO 2 in plants. Thus, transcriptomics and metabolomics were used to study the toxic mechanism of rutile nano TiO 2 or TiO 2 -Cd (rutile nano TiO 2 and CdCl 2 mixture) on rice ( Oryza sativa L.). After 40 days of exposure, the plant height and root dry weight of rice were significantly decreased in the nano TiO 2 -Cd group compared to the blank group (nano TiO 2 and CdCl 2 free). After Cd treatment, 423 differentially expressed genes (DEGs) and 16 differential metabolites were identified. Nano TiO 2 exposure induced significant regulation of 299 DEGs and 6 metabolites. After nano TiO 2 -Cd coexposure, 1660 DEGs and 181 differential metabolites were identified. Notably, the EDGs (e.g., chalcone isomerase and hydroxycinnamoyl transferase) and differential metabolites (e.g., chrysin and galangin) demonstrated the disruption of flavonoid biosynthesis in Cd-treated rice. After rice was exposed to nano TiO 2 , the DEGs were related to ribosome, whereas the differential metabolites were associated with pyruvate metabolism and valine, leucine , and isoleucine biosynthesis. Furthermore, 14 DEGs (e.g., asparaginyl-tRNA synthetase and methionyl-tRNA formyltransferase) involved in aminoacyl-tRNA biosynthetic pathways were significantly upregulated in rice treated with nano TiO 2 -Cd, in line with the changes in related metabolites (e.g., L -asparagine and 10-formyltetrahydrofolate). Our results show that it is necessary to pay close attention to the toxicity of nano TiO 2 -Cd coexposure in paddy ecosystems and use ENPs with caution to combat the phytotoxicity of heavy metals.
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PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Hao Yang,Ping He,Henglun Cheng,Baoqing Shentu
To promote the anti-aging performance of thermoplastic vulcanizates (TPVs) versus ultraviolet (UV)/O3 exposure, a nano-TiO2-loaded antioxidant (TiO2-KH570-MB) was prepared by a thiol–ene reaction between 2-mercaptobenzimidazole (MB) and modified nano-TiO2 (TiO2-KH570). Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis demonstrated the chemical linkage between MB and modified nano-TiO2, and the loading amount of MB was approximately 5.19 wt %. The contact angle test showed that the surface hydrophobicity of TiO2-KH570-MB was significantly increased due to the immobilization of MB. Scanning electron microscopy revealed that TiO2-KH570-MB was uniformly distributed in the TPV matrix. The anti-aging property of TPV compounds was tested in the device with high-intensity ultraviolet radiation and high-concentration ozone. The effects of UV/O3 comprehensive aging on the TPV compounds were evaluated by means of the variations of surface morphology, tensile test, hardness, gel content, and carbonyl index with aging time. On the basis of the aging behavior, we concluded that TPV/TiO2-KH570-MB exhibited excellent stability against UV/O3 aging, due to the homogeneous dispersion, low level of migration, and low volatility of TiO2-KH570-MB.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Cheng Liu,Yao Qin,Wei Guo,Yingzhang Shi,Zhiwen Wang,Yan Yu,Ling Wu
Enormous efforts have been devoted to exploring the influence of the materials’ morphology on photocatalytic performance, while the role of active site between them attracts less attention. Herein, three types of anatase nano-TiO 2 with different morphologies were successfully prepared for visible-light-driven photocatalytic selective oxidation of benzylamine. The material properties of the samples were systematically studied by various characterization techniques such as XRD, SEM, TEM, AFM, XPS, UV–vis DRS, ESR and in situ FTIR. Due to possessing clear advantages especially for having more active sites (coordinatively unsaturated Ti atoms and oxygen vacancies), the TiO 2 with porous structure shows more excellent photocatalytic performance than the other samples. Coordinatively unsaturated Ti atoms can chemisorb and activate benzylamine molecules via forming H-N … Ti coordination species, whose absorption property of visible light guarantees that TiO 2 samples can achieve the photocatalytic process under visible light. Oxygen vacancies can chemisorb and activate oxygen molecules to form reactive oxygen species (superoxide radical) by the reduction of photogenerated electrons. Finally, a possible synergetic mechanism based on the interaction of reactants and catalyst interfaces was proposed at the molecular level to illustrate the photocatalytic process.
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高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2020
·
IF 4.419
Jinfeng Sun,Liang Tian,Zhuqing Yu,Yu Zhang,Chengdong Li,Guihua Hou,Xiaodong Shen
The effects of using different sizes of nano-TiO 2 (NT) on the hydration characteristics of Portland cement with different water to solid ratios (w/s, solid: cement + NT) were investigated in this study. Cement was partially replaced by NT with two sizes, 5 nm and 25 nm, at weight fractions of 0, 0.5%, 1.0%, 1.5% and 2.0%. The compressive strength, hydration products, hydration degree, pore structures and morphologies of the modified cement pastes were systematically evaluated. The experimental results showed that a suitable NT content effectively enhanced the compressive strength of the cement paste, and this enhancement directly depended on the NT particle size. Cement paste mixed with 5-nm NT resulted in a higher compressive strength than 25-nm NT, irrespective of the w/s ratio. The cement paste with a maximum compressive strength at all the curing ages was obtained using a 0.3 w/s ratio and 0.5 wt% of 5-nm NT (which were therefore identified as the optimal NT parameters). The compressive strength of this cement paste increased by 41.4%, 15.9%, 18.7% and 24.35% at 1, 3, 7 and 28 days, respectively, compared to a control sample. For both NT sizes, the w/s ratio and the NT content controlled the compressive strength development of the paste during the early and late ages, respectively. Compared with 25-nm NT, replacing cement by 5-nm NT within the optimum content range was more effective in accelerating cement hydration, increasing the hydration degree, decreasing the crystal size of Ca(OH) 2 , refining the pore structure and densifying the cement paste at the microscale, all of which increased the compressive strength at the macroscale.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 30
·期 5
·1908309
·
IF 15.621
Sainan Luo,Tao Yuan,Luke Soule,Jiafeng Ruan,Yahui Zhao,Dalin Sun,Junhe Yang,Meilin Liu,Shiyou Zheng
Ion-insertion capacitors show promise to bridge the gap between supercapacitors of high power densities and batteries of high energy densities. While research efforts have primarily focused on Li + -based capacitors (LICs), Na + -based capacitors (SICs) are theoretically cheaper and more sustainable. Owing to the larger size of Na + compared to Li + , finding high-rate anode materials for SICs has been challenging. Herein, an SIC anode architecture is reported consisting of TiO 2 nanoparticles anchored on a sheared-carbon nanotubes backbone (TiO 2 /SCNT). The SCNT architecture provides advantages over other carbon architectures commonly used, such as reduced graphene oxide and CNT. In a half-cell, the TiO 2 /SCNT electrode shows a capacity of 267 mAh g −1 at a 1 C charge/discharge rate and a capacity of 136 mAh g −1 at 10 C while maintaining 87% of initial capacity over 1000 cycles. When combined with activated carbon (AC) in a full cell, an energy density and power density of 54.9 Wh kg −1 and 1410 W kg −1 , respectively, are achieved while retaining a 90% capacity retention over 5000 cycles. The favorable rate capability, energy and power density, and durability of the electrode is attributed to the enhanced electronic and Na + conductivity of the TiO 2 /SCNT architecture.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 31
·
IF 1.866
Wu Kuang,Zhongnan Liu,Guodong Kang,Dandan Liu,Meiqing Zhou,Yiming Cao
The poly(2-hydroxyethyl methacrylate) grafted titanium dioxide nanoparticles were synthesized and added to the substrate of flat-sheet thin film composite forward osmosis (TFC-FO) membranes. The hydrophilicity of substrate was improved, which was advantageous to enhance the water flux of TFC-FO membranes. The membranes containing a 3 wt % TiO 2 -PHEMA in the substrate exhibited a finger-like structure combined with sponge-like structure, while those with lower or without TiO 2 -PHEMA content showed fully finger-like structures. As for FO performance, the TFC-FO membranes with 3 wt % TiO 2 -PHEMA content achieved the highest water flux of 42.8 LMH and 24.2 LMH against the DI water using 2 M NaCl as the draw solution tested under the active layer against draw solution (AL-DS) mode and active layer against feed solution (AL-FS) mode, respectively. It was proven that the hydrophilic property of membrane substrates was a strong factor influencing the water flux in FO tests. Furthermore, the structural parameter was remarkably decreased with an increase of TiO 2 -PHEMA content in membrane substrate, indicating the reducing of internal concentration polarization. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43719.
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高影响因子
NANO
·
2016
·
IF 0.951
Zhiguo Sun,Jitao Yang,Li Zhang,Hongyong Xie
A new photocatalyst of sodium humate (HA–Na)/Nano-TiO 2 coating on the glass spheres for flue gas denitrification (DeNO x ) was prepared using the impregnation method. The HA–Na/TiO 2 is characterized by Brunauer–Emmett–Teller (BET), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscope (SEM). The photocatalytic activity of HA–Na/TiO 2 on removing NO x was investigated in a self-designed photocatalytic reactor. The synergistic mechanism of HA–Na and TiO 2 on DeNO x is also proposed and demonstrated. The experimental results indicate that specific surface area and average pore size of HA–Na are improved owing to the mixed TiO 2 nanoparticles. The crystal structure of TiO 2 has little change after mixing with HA–Na. Due to high photocatalytic performance of TiO 2 , NO was oxidized to NO 2 and HNO 3 eventually. On the other hand, HA–Na support can absorb and react with HNO 3 , which accelerates 10% of the catalytic reaction of TiO 2 and the utilization of light source. The chemical and physiological activity of oxidized HA–Na are improved than the original humate. The HA–Na/TiO 2 photocatalysts show great property on eliminating NO x because of the promoting effect between HA–Na and TiO 2 , and the NO removal efficiency can reach to 80% at the optimum condition.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Jianhua Sha,Yunkai Sun,Haiyan Yu,Zitong Yang,Hongwei Chu,Yan Wang,Qinyan Yue,Weiyan Yin,Shiping Xu
To overcome the recovery challenge of nanoscale photocatalysts, great endeavor has been paid to explore effective nano-TiO 2 immobilization approaches, but comprehensive comparison between these methods is still lacking. Herein, four approaches, namely impregnation-calcination, sol-gel, solvothermal route and click chemistry strategy were fully compared to immobilize nano-TiO 2 onto biochar from the viewpoint of properties characterization, photocatalytic activity, structure stability and pollutant degradation pathway. It was found that, compared to other three methods, product obtained by click chemistry (CC-P25/BC) showed superior adsorption-photocatalysis synergy and persistent long-term stability. These superiorities were not attributed to pore structure, crystallinity or light absorption , but predominated by the robust chemical bonds between TiO 2 and biochar, which served as an effective internal channel for electrons transportation. Besides, with CC-P25/BC as photocatalyst, a unique self-acceleration period was observed during methylene orange (MO) degradation. Via investigating MO degradation pathway and solution environment, we found that it was the strong photocatalytic activity of CC-P25/BC that selectively accelerated MO demethylation, thus leading to solution pH drop and subsequent MO adsorption enhancement and then degradation acceleration. Thus, this study confirmed the superiority of click chemistry in nanoscale photocatalyst immobilization, and affirmed the importance of pollutant degradation process in governing its degradation rate.
研究领域:
环境科学
·
材料科学
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高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Xu’an Fang,Yuan-Jun Tong,Nan Li,Lu-Dan Yu,Gangfeng Ouyang,Fang Zhu
Currently, nano-titanium dioxide (nTiO 2 ) is considered an emerging environmental contaminant . Bottlenecked by the traditional destructive and lethal sampling methods, nTiO 2 ’s effect in living plants is poorly investigated. Here, in vivo tracing of endogenous salicylic acids at regular intervals was performed by using solid phase microextraction (SPME) technique for evaluating the effects of nTiO 2 on plants. By planting aloe in soil containing varying amounts of nTiO 2 , the titanium (Ti) element accumulated in the leaves to concentrations and then reached the maximum of 1.1 ± 0.4 μg/g after nTiO 2 exceeding 0.1 g/kg. The levels of salicylic acid (SA) and acetylsalicylic acid (ASA) were up-regulated upon the exposure to nTiO 2 , while were positively correlated to the contents of Ti. Moreover, the increased malondialdehyde, decreased total superoxide dismutase and fluctuated glutathione along with the addition of nTiO 2 demonstrated the oxidative stress caused by nTiO 2 . Meanwhile, apparent growth indicators including leaf elongation, plant fresh weight and root development were influenced, which further confirmed the toxicity of nTiO 2 imparted on aloe. This study presents the possibility of using salicylic acids as biomarkers for revealing the toxicity of nTiO 2 on plants in addition to the other biomarkers and biomass data, and the in vivo SPME technique is powerful for their monitoring.
研究领域:
环境科学
·
植物生理学
·
毒理学
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DOI
PubMed
高影响因子
Frontiers of Materials Science
·
2025
·Vol. 19
·期 4
·250743
·
IF 2.3
Zhang Hang,Liu Shuhui,Zhang Xingxiang,Li Wei
A new method of incorporating nano-sized titanium dioxide (nano-TiO 2 ) particles onto the shell of photochromic microencapsulated phase change materials was introduced, in order to address issues of easy degradation of photochromic dyes’ core components caused by ultraviolet (UV) irradiation and residual organic emulsifiers. Using nano-TiO 2 as the Pickering emulsion stabilizer and cross-linked polyurethane as the shell material, a composite protective structure was constructed to encapsulate core materials with phase-change and photochromic properties, thereby forming photochromic phase change microcapsules (TPT-MPCMs) with UV protection and thermal insulation. Characterization results show that the core–shell structured TPT-MPCMs possessed high light transmittance, with a particle size of 5–15 µm and a latent heat of 116.2 J·g −1 . The highly cross-linked shell formed by xylitol and isophorone diisocyanate effectively protected the core from thermal degradation up to 180 °C, while the nano-TiO 2 shell surface allowed maintaining the UV responsiveness of microcapsules after exposure to intense UV irradiation for 5 h. This strategy significantly improves the long-term stability and service life of photochromic microcapsules under harsh environments, opening up broad prospects for their applications in fields such as outdoor anti-counterfeiting labels, intelligent temperature-controlled coatings, and multifunctional smart textiles.
研究领域:
材料科学
·
智能材料
·
纳米技术
·
热能存储
·
功能涂层
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2012
·
IF 4.173
Zhujian Huang,Pingxiao Wu,Yonghong Lu,Xiaorong Wang,Nengwu Zhu,Zhi Dang
The organic layered double hydroxides (LHDs)/TiO 2 composites with various mass ratios were prepared by the reconstruction of mixed metal oxides to photodegrade dimethyl phthalate (DMP). The physicochemical properties of the obtained products were analyzed by X-ray diffraction (XRD) spectra, X-ray photoelectron spectra (XPS), UV–vis diffuse reflectance spectroscope and scanning electron microscope (SEM). The results showed that the TiO 2 particles and the organic LDHs were combined together through chemical bonds, and TiO 2 particles were well distributed on the surface of the interconnecting organic LDHs nano-flakes. According to the experimental results of adsorptive and photodegradation of DMP, the organic LDHs with flaky structure could effectively adsorb the DMP molecules and the adsorption isotherm by the composites modeled well with the Langmuir equation. The enrichment of DMP onto the composites and the external hydroxyl groups of the composites produce a synergistic effect leading to greatly enhance the rate of DMP photocatalytic degradation by the obtained composites.
研究领域:
环境化学
·
材料科学
·
光催化
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环境污染治理
·
纳米复合材料
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DOI
高影响因子
Agronomy-Basel
·
2026
·Vol. 16
·期 3
·
IF 3.4
Xiang Ye,Ruijiao Song,Juncang Qi
Nanotechnology holds great promise for alleviating drought stress in crops. This study elucidates and compares the distinct physiological mechanisms by which two nanomaterials, nano-cerium oxide (CeO2) and nano-titanium dioxide (TiO2), function as seed-priming agents to enhance drought tolerance in barley. A comprehensive analysis encompassing germination performance, hormonal dynamics, starch metabolism, osmotic adjustment, photosynthetic pigments, and the antioxidant system revealed that each nanomaterial operates through a unique pathway. Specifically, priming with 150 mg·L−1nano-CeO2(CP-150) primarily promoted root development and stress resilience. This effect was achieved by persistently reducing abscisic acid (ABA) levels, elevating gibberellin (GA3), enhancing amylase activity to mobilize seed reserves, and increasing soluble protein accumulation in roots. In contrast, priming with 500 mg·L−1nano-TiO2(TP-500) was more effective in enhancing shoot physiology and adaptive capacity by rapidly inducing auxin (IAA), robustly stimulating the antioxidant enzyme system, and increasing photosynthetic pigment content. The temporally and spatially complementary actions of these nanomaterials, with nano-CeO2fostering root-based resilience and nano-TiO2boosting shoot-level functions, synergistically support seed germination and seedling establishment under drought conditions. This study provides a mechanistic foundation for designing targeted nano-priming strategies to improve crop drought resistance.
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高影响因子
危险品化学品经营许可证（带存储）