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.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2015
·
IF 2.719
Xi Li,Jie Li,Yingchun Li,Kai Xia
8-hydroxyquinoline aluminum/nano-TiO 2 composites were prepared via in situ. In order to make a better combination of the two component, Octavinyl-T8-silsesquioxane (8-vinyl POSS) was introduced into the composite system . The structure and properties of the samples were characterized by XRD , SEM, XPS , UV–visible absorption, Fluorescence spectra and Time-resolved emission-decay. These results show both β-phase and γ-phase of Alq 3 exist in the composite products. Meanwhile, the addition of nano-TiO 2 and 8-vinyl POSS does not change the crystalline and structure of as-prepared Alq 3 . Interestingly, however, XPS spectra shows that two new kinds of interaction forces emerge after the addition of 8-vinyl POSS, owing to the formation of Al–O–Si and Si–O–Ti bond, presumably. Besides, the emission intensity of Alq 3 /nano-TiO 2 and Alq 3 /8-vinyl POSS/nano-TiO 2 increases by 22% and 33%, respectively. The addition of TiO 2 and 8-vinly POSS will not affect the position of emission peak, but will increase the transmission efficiency in electron–hole pairs. In the meantime, surprisingly, the modified Alq 3 has a longer lifetime than as-prepared Alq 3 .
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanomaterials
·
2017
·
IF 1.871
Yaxiong Ji,Xing Rong,Hong Zhong,Yuanhao Wang,Shifeng Wang,Lin Lu
We report a brand new recycling route of waste marble powder, by means of surface modification with homemade nano-TiO2 particles to produce low cost coating materials for the application in air quality improvement. The as-prepared nano-TiO2 in anatase phase exhibits excellent photocatalytic characteristic, reflected by the high degradation rate of over 95% of methylene blue within 6 hours of UV irradiation. The prepared coating consisting of nano-TiO2 clad marble powder was tested by monitoring the decomposition rate of formaldehyde gas. A high degradation efficiency of about 95% within 9 hours of illumination is achieved, demonstrating a promising potential for removing the harmful and toxic organic pollutants in air while applying this coating in buildings both interiorly and exteriorly.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2016
·Vol. 9
·期 4
·230
·
IF 2.728
Lili Ren,Yingchun Cai,Limin Ren,Hong Yang
Beeswax was modified through the direct blending of nano-TiO2, chitosan, acid dyes, and neutral dyes. With the varied modified beeswax, hot waxing was conducted on compressed poplar wood. Treated wood surfaces were characterized with scanning electron microscopy and thermogravimetric analysis. Results show that the C, O, N, Au, S, and Ti elements in modified beeswax successfully penetrated into pits of compressed poplar wood, imparting rich colors to the wood surface. The blending of 10% (mass fraction) beeswax, 0.2% chitosan, and 0.05% neutral red was the best treatment for mulation for improving the in-surface staining uniformity, durability, surface gloss, contact angle, and texture conspicuity of compressed poplar.Keywords:beeswax;chitosan;nano-TiO2;dye;hot waxing;surface properties of compressed wood
研究领域:
材料科学
·
林产品化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Yu Tu,Sijia Sun,Hao Ding,Xuan Wang,Zewei Wu
Photocatalytic activation of persulfate has exhibited tremendous potential in water purification because of its green and environmentally friendly process. However, this process often exhibits low activation efficiencies and difficult recovery of the photocatalyst. Herein, schorl-supported nano-TiO 2 composite photocatalysts (S/TiO 2 ) were prepared by a mechanical grinding method for efficient activation of potassium monopersulfate (PMS). The anatase TiO 2 nanoparticles with particle size of approximately 30 nm was uniformly loaded on the surface of schorl via forming Si-O-Ti bonds. The S/TiO 2 assisted with PMS (S/TiO 2 -PMS) exhibited remarkable degradation performance and stability. In this system (S/TiO 2 -PMS), the C/C 0 value of phenol solution (10 ppm) were decreased to 0.070 and 0 after 30 min and 90 min of irradiation, where the degradation extent were 93.0% and 100% respectively. The rate of phenol degradation with S/TiO 2 -PMS was 12.6 times that seen with TiO 2 -PMS. The oxidation active species were holes and SO 4 •− in S/TiO 2 -PMS system subjected to simulated sunlight. It was demonstrated that the polarization electric field of the schorl enhanced the separation efficiency of the photoinduced electrons and holes for improving the performance of the S/TiO 2 -PMS. On the other hand, the transformations of Fe 3+ and Fe 2+ on the schorl surface further promotes the activation of PMS. This work provides a new choice for designing TiO 2 -based photocatalytic persulfate activation system targeting the field of advanced oxidation water treatment.
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
CEMENT & CONCRETE COMPOSITES
·
2023
·
IF 10.5
Yuanyuan Shen,Long Jiang,Peiliang Shen,Ligang Peng,Chi-sun Poon,Fazhou Wang
A new eco-friendly carbonation coating with a photocatalytic function was developed using dicalcium silicate (C 2 S) and nano TiO 2 , aiming to remove air pollution and enhance the durability of concrete at the same time. The photocatalytic performance, mechanical properties, and durability of the carbonated coatings incorporating different additions of TiO 2 were evaluated, and the development of carbonation products and microstructure were investigated. The results show that the photocatalytic efficiency was increased linearly from 2518 μmol·m −2 ·h to 4392 μmol·m −2 ·h as the TiO 2 doping amount was increased from 1% to 8%. In addition, the composition and microstructure analysis indicated that TiO 2 not only improved the carbonation degree of C 2 S but also promoted the formation of metastable calcium carbonate, including aragonite, vaterite, and amorphous calcium carbonate, leading to a densified microstructure structure. At the same time, the improved carbonation process could capture up to 15.18% CO 2 by mass. As a result, the bonding strength was improved from 3.29 MPa to 4.69 MPa after incorporating 8% TiO 2 , which is much higher than the conventional cement-based coating. Furthermore, the microhardness of the coating increased from 150 HV to 178 HV.
研究领域:
建筑材料学
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环境科学
·
材料化学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Jihong Jiang,Yanchun Miao,Han Wang,Xiaobin Dong,Yali Li,Junlin Lin,Zeyu Lu
Regardless of how good pre-dispersion of nano-TiO 2 in aqueous solutions, re-aggregation rapidly occurs once it is mixed into fresh cement mixtures, limiting the nano-reinforcing efficiency for cement-based materials. In this study, an in-situ release strategy by pre-encapsulating nano-TiO 2 in microscaled ice and post-dispersing into fresh cement matrix during ice-melting process was developed to highly reinforce the microstructure and properties of cement paste. Compared with the conventional dispersion strategy, a much better dispersion of nano-TiO 2 (0.6 wt% by cement) was achieved using the in-situ release strategy, which not only improved the 7- and 28-day compressive strength of cement paste by 9.2% and 10.1%, respectively, but also reduced the cement hydration heat and water adsorption by 36.1% and 4.6%, respectively. In addition to this, the NO degradation efficiency of cement paste was also improved by 20% due to the larger exposed surface area of nano-TiO 2 with better dispersion. These research outcomes demonstrate that the in-situ release strategy facilitates the dispersion of nano-TiO 2 in cement matrix and contributes to highly reinforcing cement paste with lower hydration heat and water adsorption, strong mechanical strength and higher photocatalytic properties.
研究领域:
土木工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Linjuan Pei,Xianmo Gu,Yantao Zhang,Jie Wang,Hao Tan,Pengfei Wang,Zhanfeng Zheng
To improve the photocatalytic performance of TiO 2 and make it easier to recycle, the titanosilicate@anatase core-shell micro-nanostructure photocatalysts were designed. The titanosilicate@anatase core-shell micro-nanostructure was fabricated by a two-step method: an acid-assisted hydrothermal treatment of the hydrogen-form natisite and a subsequent calcination . In the first step, the dissolution and recrystallization of Ti species led to the formation of TiO 2 shell over the titanosilicate; in the second step, the calcination not only facilitated the formation of Ti−O−Si bond, but also improved the crystallization of TiO 2 shell. The rutile TiO 2 was not detected even at 900 °C, which could be attributed to the strong interaction between TiO 2 nanocrystals and the titanosilicate core through Ti−O−Si bond at the interface. The formation of Ti−O−Si bond also changed the surface characteristic of the TiO 2 shell, which facilitated the enrichment of RhB dye molecules around the catalyst and induced the fast production of the O 2 •− . The collaboration of the core and the shell contributed to the quick degradation of RhB under visible light and the excellent recycling performance. The growth kinetics of the core-shell micro-nanostructure has been studied in detail, which provided a novel and facile synthesis strategy for the fabrication of TiO 2 micro-nanostructure easy to be recycled.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
·
2024
·Vol. 36
·期 12
·04024404
·
IF 3.1
Jihong Jiang,Han Wang,Yanchun Miao,Xiaobin Dong,Yali Li,Zeyu Lu
Due to the large specific surface area and strong van der Waals force, bulk aggregation of nano-TiO2 immediately occurs when it is mixed with fresh cement mixture, limiting its reinforcing efficiency to cement-based materials. This study proposes a novel strategy to improve the mechanical and photocatalytic properties of cement mortar using nano-TiO2 hydrosol instead of conventional nano-TiO2 powder. Compared with pure mortar, the 28-day compressive and flexural strength of mortar with 0.6% by weight nano-TiO2 hydrosol were enhanced by 51% and 15%, respectively, the water absorption and chloride ion diffusion coefficient were decreased by 21% and 31%, respectively. The observed improvements were attributed to the denser microstructure and enhanced micromechanical properties in the bulk matrix and around interfacial transition zone (ITZ), resulting from the better dispersion of nano-TiO2 hydrosol in alkaline environment. In addition, compared with the mortar with nano-TiO2 powder, the degradation efficiency of Rhodamine B and NO by the mortar with nano-TiO2 hydrosol (0.6% by weight) was enhanced by 18.3% and 17.1% at 28 days, respectively. The enhancement resulted from the higher intrinsic photocatalytic activity and larger exposed surface area of nano-TiO2 hydrosol due to better dispersion. The research outcomes demonstrate the potential of using nano-TiO2 hydrosol in cement mortar to significantly increase the mechanical strength, durability, and photocatalytic activity, which can lead to the development of cement-based constructions with the integrated design of functionality and structure.
研究领域:
建筑材料
·
环境工程
·
纳米技术
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2018
·
IF 2.955
Xuan Yin,Chenghao Dong,Chunpeng Chai,Yunjun Luo
A new kind of green and functional two-component flame-retardant waterborne polyurethane and its coating were synthesized through adding polyurethane polyol dispersions, hydrophilic nanoTiO 2 and hydrophilic curing agent. The properties and analysis were characterized via FTIR, laser particle analyzer, rheometer, TEM, TGA, TGA-FTIR, LOI tester, SEM, UV–vis spectrum, water and solvent resistance. The results showed the tensile strength counld reach 22.3 MPa. And the nanoTiO 2 delayed speed of thermal decomposition to improve thermostability of two-component waterborne polyurethane. Larger quantities of hydrophilic nanoTiO 2 did not produce a larger unbroken carbon yield surface or thicker carbon layers, but effectively produced a condensed phase flame-retardant effect with OP550 during burning. Besides, LOI and UL-94 also reached over 29.4% and V–0 respectively. The UV and visible light shielding noticeably increased with the adding nanoTiO 2 . The 0.5% content of nanoTiO 2 had the optimal properties in green and functional two-component waterborne polyurethane coatings.
研究领域:
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2015
·
IF 2.729
Airong Mao,Hongbo Li,Zhaosheng Cai,Xiaoya Hu
A glassy carbon electrode modified with nano TiO 2 and multi-walled carbon nanotubes composites dispersed in a novel cationic surfactant was described for the determination of trace mercury(II) by linear anodic stripping voltammetry. Under optimal experimental conditions, the linear sweep anodic stripping peak current was linear with the concentration of Hg(II) in the range of 0.1–100 μmol L −1 with a detection limit of 0.025 μmol L −1 . The sensitivity was found to be 3.7014 A/mol L −1 . The proposed electrode also showed a high selectivity for mercury in the presence of common potential interfering metal ions. Moreover, the proposed electrode revealed good reproducibility and stability. The proposed method was successfully applied for the determination of Hg(II) in river water and industrial wastewater samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2015
·
IF 2.358
Wenzhong Zhai,Zhan-Min Wu,Xiaowen Wang,Pengfei Song,Yufeng He,Rong-Min Wang
Using nano-TiO 2 as stabilizer, a novel waterborne antibacterial Pickering emulsion containing epoxy-acrylate copolymer@nano-TiO 2 composite particles (PkE@NT) has been successfully prepared via emulsion polymerization. The core–shell composite nanoparticles were characterized by dynamic light scattering (DLS), scanning electron microscope (SEM) and transmission electron microscopy (TEM), whose components were also confirmed by FT-IR and TGA. The mechanism of PkE@NT was suggested by monitoring the particle size changes in time. The average particle size was approximately 180 nm. Furthermore, water absorption of PkE@NT film got to 142 wt%, which showed good water absorption. The basic properties and antibacterial property of PkE@NT emulsion for interior coatings were also investigated. It showed that the emulsion had excellent adhesive force and antibacterial activity.
研究领域:
材料科学
·
生物学
✓ 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）