ChemPlusChem
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2019
·Vol. 84
·期 5
·474-480
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IF 3.441
Yu Fang,Yuanyuan Li,Feng Zhou,Peiyang Gu,Jiadi Liu,Dongyun Chen,Najun Li,Qingfeng Xu,Jianmei Lu
Graphical Rapid removal : A photocatalyst comprising black TiO 2 nanoparticles (BTNs) grown in situ on a porous carbon material (PC) can be used for the efficient photocatalytic degradation of antibiotics and pollutants. Under visible-light irradiation, the photogenerated electrons of BTNs react with O 2 to generate . O 2 − radical species and holes (h + ) which can decompose the adsorbed antibiotics. The PC allows a more efficient adsorption as well as rapid transport of charge carriers and provides more active sites. Porous carbon (PC) materials with high surface area can separate electron–hole pairs and adsorb organic pollutants more effectively. A series of nanocomposites were prepared by anchoring black TiO 2 nanoparticles (BTN) onto PC through a calcination process. Chemical and structural features of samples were examined by X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, powder X-ray diffraction (P-XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses. The resulting adsorption-photocatalysis synergistic effect led to a dramatically improved photocurrent for BTN@PCs, thus indicating the high photocatalytic performance toward water-soluble organic species. For instance, the degradation of tetracycline under visible light reached 90 %, which is higher than that for activated carbon doped onto BTN (57 %) without any additional agents. Moreover, the degradation of other antibiotics (such as oxytetracycline and ciprofloxacin) and methylene blue were also studied, thus showing that this system has the potential to be used for water treatment.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
International Journal of Greenhouse Gas Control
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2016
·
IF 4.064
Yu Zhang,Bo Zhao,Jiazong Jiang,Yuqun Zhuo,Shujuan Wang
The enhancement of absorption of CO 2 by propylene carbonate in the presence of TiO 2 nanoparticles was investigated. The influences of solids loading and particle size of TiO 2 nanoparticles on the absorption rate were studied experimentally. The results show that the gas absorption rate can be enhanced significantly in the presence of TiO 2 nanoparticles. The CO 2 absorption enhancement factor firstly increases and then decreases with the increases of solids loadings, which proves the existence of optimal solids loading. The particle size is also a main factor, which affects CO 2 absorption enhancement factor. As the particle size increases, the optimal solids loading gradually increases. A three-dimensional instantaneous numerous-particle di-mechanism model based on the shuttle mechanism as well as a micro-convection mechanism was developed. The results calculated by the model are close to the experimental results, which showed the model can predict experimental data very well.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
Particuology
·
2017
·
IF 2.621
Chun Shen,Kexia Pang,Le Du,Guangsheng Luo
A facile and green method to prepare Ce-doped TiO 2 nanoparticles supported on porous glass beads is reported. An ion exchange process and subsequent calcination yielded Ce-doped TiO 2 nanoparticles with a mean size of 4.8 ± 0.3 nm. The nanoparticles were dispersed on the surface of porous glass beads. The addition of Ce enhanced the visible light absorption of the TiO 2 nanoparticles in the 400–500 nm spectral window. The band gap of the as-prepared catalyst was 2.80 eV. The Ce-doped TiO 2 nanoparticles immobilized on porous glass beads exhibited excellent photocatalytic activity for the visible-light-degradation of methyl orange (MO) and rhodamine B (RhB); with rate constants of 0.095 and 0.230 min −1 ; respectively. The effects of Ce dosage; reaction duration; and initial solution pH on the conversion of MO and RhB dyes were investigated. The green synthesis and favorable photocatalytic activity makes the Ce-doped TiO 2 nanoparticles immobilized on porous glass an attractive alternative for the efficient degradation of organic pollutants.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Ruochong Zhang,Dan Qiao,Xuqing Liu,Zhiguang Guo,Litian Hu,Lei Shi
The dispersibility of TiO2 nanoparticles in polyalphaolefin (PAO) are improved by the interaction between the chemically modified TiO2 (denoted as TTO) and 1-methyl-2,4-bis (N-octadecylurea) benzene (MOB) gelator. Tribological tests show the outstanding friction-reducing and antiwear performances of PAO10–MOB–TTO under the common friction condition and higher temperature friction condition, respectively. The lubricating property of PAO10–1% MOB–0.5% TTO is further enhanced after UV irradiation for 40 min, which might be attributed to the photocatalytic effect of TTO under UV. The physical adsorption film is enhanced by the immobilization function of MOB. The chemical reaction film including various organic oxides and nitrides are produced for the active element in TTO and MOB. The antiwear performance is further improved by the “mending effect” of TTO with the good dispersibility. The combined effects of various factors promote the excellent lubricating performances of PAO10–1% MOB–0.5% TTO.
研究领域:
材料科学
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机械工程
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
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IF 5.2
Yongkang Shi,Yan Nie,Hualong Xu,Pengyu Bi,Boyang Chen,Xinyue Hou,Hongchao Ma,Meiwen Cao
Surface coating technology is an effective anti-corrosion strategy which can form a layer of anti-corrosion film on metal surface , effectively preventing it from oxidation and corrosion. Among various strategies, silanization treatment of metals is the most commonly used one. However, using silane-based coatings alone often leads to poor anti-corrosion performance due to insufficient mechanical strength and presence of surface defects . In order to improve the corrosion resistance of silane coatings, a hybrid surface coating has been constructed by introducing epoxy resin and Ag/TiO 2 nanoparticles into the silane film in this work. After adding epoxy resin, the thickness of the silane film greatly increases, which improves its mechanical properties . Ag/TiO 2 nanoparticles can enhance the cross-linking between silane molecules and epoxy resin, thereby preventing formation of surface defects. The epoxy resin-silane-Ag/TiO 2 composite surface coating is coated on the surface of AA2024 aluminum alloy using spin coating method. Electrochemical and salt spray tests indicate excellent corrosion resistance performance of the composite coating . This composite coating technology may have potential applications on the surfaces of various metal products such as medical devices and aerospace materials, and will shed light on the development of new surface coating technologies.
研究领域:
材料科学
·
腐蚀与防护
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DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Lin Wang,Hongqiang Chu,Jiaxuan Xie,Mingzhi Guo,Linhua Jiang,Xiang Xi,Yi Fang,Wei Zhao
Concrete corrosion in wastewater pipelines is caused by biogenic sulfuric acid produced locally by sulfur-oxidizing microorganisms. Concrete mixtures are commonly modified to prevent this form of corrosion by adding biocides to inhibit their biological activities. However, using biocides is not always desirable because of their limited lifespan and potential for leaching into the environment. Therefore, there is a need to develop more durable alternatives to prevent microbial-induced corrosion of concrete. In this study, three types of Cu-Ti amorphous alloys (Cu 35 Ti 65 , Cu 50 Ti 50, and Cu 65 Ti 35 ) were prepared by ball milling, and compared with commercially available TiO 2 nanoparticles to assess their effects on the resistance of the microbial-induced corrosion performance of mortar. Detailed investigations were conducted on the appearance, mechanical properties, and corrosion depth of mortars at various exposure durations in an accelerated biocorrosion environment. The results revealed that the mortars mixed with Cu 35 Ti 65 , Cu 50 Ti 50 , Cu 65 Ti 35 , and TiO 2 nanoparticles exhibited significantly better resistance to microbial-induced corrosion than the reference mortars. The resistance to microbial-induced corrosion of the mortar mixed with Cu 50 Ti 50 was the best. The superior antimicrobial corrosion performance of the mortar containing Cu-Ti amorphous alloy is influenced by both smaller particle sizes and higher sterilization performance. These findings can contribute to the development of novel applications of amorphous alloys in functional concrete.
研究领域:
土木工程
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材料科学
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微生物学
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DOI
高影响因子
MACROMOLECULES
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2013
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IF 5.521
Jie Xiao,Wenqin Chen,Fangyingkai Wang,Jianzhong Du
TiO2 nanoparticle has been considered as a safe sunscreen agent to reduce the skin cancer risk when exposed to sunlight. However, recently it was found that TiO2 particles accelerate the photodamage of skin due to their photocatalytic degradation activity. To effectively eradicate this unwanted effect, we present a new strategy toward the preparation of organic/inorganic hybrid polymer/TiO2 nanoparticles with highly effective UV-screening property but eliminated photocatalytic activity. We prepared new polymer micelles with corona–shell–core structure based on self-assembly of poly(ethylene oxide)-block-poly(2-(dimethylamino)ethyl methacrylate)-block-poly(styrene) (PEO-b-PDMA-b-PS) triblock copolymer. Selective deposition of hydrophobic tetrabutyl titanate (TBT) in the PDMA shell in polar solvent leads to a thin PDMA/TiO2 hybrid layer (∼8 nm), which can not only effectively reflect UV rays but also eliminate its photocatalytic ability to protect skin. The sol–gel reactions of TBTs in the PS core domain lead to a PS/TiO2 hybrid core, which can also absorb/reflect UV lights by PS/TiO2. The biocompatible PEO coronas can prevent direct contact of TiO2 with skin. Moreover, sol–gel reactions in the PDMA and PS domains can stabilize the triblock copolymer micelles, which offer the promising potential for further formulations in aqueous solution. The ATRP kinetics confirmed that PEO-b-PDMA-b-PS triblock copolymer can be synthesized in one pot, which simplified the synthetic procedure of copolymers. TEM and DLS studies revealed the morphology and size of self-assembled polymer micelles and the subsequent polymer/TiO2 hybrid nanoparticles upon sol–gel reactions. UV experiments confirmed the highly efficient UV screening activity but eliminated photocatalytic property of polymer/TiO2 hybrid nanoparticles. For example, at extremely low TiO2 content in solution (10 ppm of polymer/TiO2 solid), ∼70% UV radiation can be blocked compared to pure organic polymer micelle, which is also much more efficient than commercially available TiO2 nanoparticles (P25). UV and DLS studies confirmed the ultrahigh stability of polymer/TiO2 hybrid nanoparticles upon strong UV radiation, which is suitable for long-term applications. Nitrogen adsorption/desorption experiment revealed that the ultralow surface area of TiO2 nanoparticles (1.6 m2 g–1) is consistent with their extremely poor photocatalytic performance.
研究领域:
材料科学
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生物医学工程
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化学工程
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DOI
高影响因子
Soft Matter
·
2023
·Vol. 19
·期 29
·5459-5467
·
IF 3.4
Yang Sui,Yi Cui,Peng Wei,Chuanbo Cong,Xiaoyu Meng,Hai-Mu Ye,Qiong Zhou
Considering the molar mass between entanglements to be an intrinsic property of ultra-high molecular weight polyethylene (UHMWPE), the number of entanglements per chain increases with increasing molar mass, correspondingly making the UHMWPE intractable. Herein, we dispersed TiO2 nanoparticles with different characteristics into UHMWPE solutions to disentangle the molecular chains. Compared with the UHMWPE pure solution, the viscosity of the mixture solution declines by 91.22%, and the critical overlap concentration increases from 1 wt% to 1.4 wt%. A rapid precipitation method was utilized to obtain UHMWPE and UHMWPE/TiO2 composites from the solutions. The melting index of UHMWPE/TiO2 is 68.85 mg, which is in sharp contrast to that of UHMWPE which is 0 mg. We characterized the microstructures of UHMWPE/TiO2 nanocomposites using TEM, SAXS, DMA, and DSC. Accordingly, this significant improvement in processability contributed to the reduction of entanglements and a schematic model was proposed to explain the mechanism by which nanoparticles disentangle molecular chains. Simultaneously, the composite demonstrated better mechanical properties than UHMWPE. In summary, we provide a strategy to promote the processability of UHMWPE without sacrificing its outstanding mechanical properties.
研究领域:
材料科学
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纳米技术
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聚合物工程
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 99
·96768-96777
·
IF 3.289
Yuhao Chu,Yuenan Chen,Nanjun Chen,Fanghui Wang,Hong Zhu
Recently a new method for increasing the ion conductivity of anion exchange membranes (AEM) was developed based on the novel materials ionic liquids (ILs). We mixed the ILs into the membrane directly instead of immobilizing onto the polymer backbone as in the traditional way. Nano-TiO2 was introduced to stabilize the ILs in the membrane. The ILs were immobilized by the nano-TiO2, acting as the “active sites” in the membrane, to enhance the mobility of the hydroxyl groups so as to increase the ion conductivity. Both pure ILs composite membranes and ILs–TiO2 composite membranes were synthesized, and their properties were compared. 1H nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy were used to analyze the structures of the composite membranes. The mechanical properties, thermal stabilities, ion conductivities, water uptakes, swelling ratios, and ion exchange capacities of the membranes were investigated. The interaction between the TiO2 and ionic liquids was confirmed by X-ray diffraction. The stability of the ILs in the membrane was measured comprehensively. All these results show that this novel method is effective and promising for AEM applications.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yinchun Hu,Zhenyang Bao,Zhaoshuang Li,Renzhong Wei,Guoen Yang,Yan Qing,Xingong Li,Yiqiang Wu
Soy protein adhesives (SPI) exhibit broad prospects in substituting aldehyde-based resin due to the economic and environmental-friendly characteristics, but still face a challenge because of the dissatisfied bonding strength and terrible water resistance. Herein, prompted by organic-inorganic hierarchy, a multifunctional and novel soy protein adhesive (SPI-RAE-TiO 2 ) consisting of rosin acid emulsion (RAE) and TiO 2 nanoparticles (TiO 2 ) were proposed. In comparison with original SPI, the dry and wet shear strengths of modified adhesive reached 2.01 and 1.21 MPa, respectively, which were increased by 130 % and 200 %. Furthermore, SPI-6RAE-0.5TiO 2 was selected as the best proportion via the method of response surface methodology (RSM). What's more, SPI-6RAE-0.5TiO 2 adhesive demonstrated prominent coating performance in both dry and wet surface conditions. Meanwhile, SPI-6RAE-0.5TiO 2 adhesive possessed excellent mildew resistance and antibacterial ability with Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ), reflecting the antibacterial rates 97.71 % and 98.16 %, respectively. In addition, SPI-6RAE-0.5TiO 2 adhesive also exhibited the outstanding green features such as the reduction of formaldehyde pollution and greenhouse effect through Life Cycle Assessment (LCA). Thus, this work provided a novel and functional approach to design multifunctional, superior-property and low-carbon footprint soy protein adhesive.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS & POLYMER COMPOSITES
·
2021
·
IF 2
Hailiang Hu,Minmin Chen,Mengye Cao
The eco-friendly functionalized TiO2/polymer antifouling (AF) coating was successfully synthesized by dispersing TiO2 nanoparticles in waterborne epoxy-modified tung oil resin. The AF effectiveness of coating was evaluated toward Staphylococcus aureus (S. aureus, ATCC6538), Escherichia coli (E. coli, ATCC8739) and diatom (Cyclotella sp., FACHB-1635). The nanoTiO2/polymer AF coating showed good antimicrobial activity both under the light and dark conditions by comparison with the pristine TiO2 nanoparticles and bulk polymer. Under light irradiation for 50 min, the AF coating showed only 8.4% and 8% survival rate for S. aureus and E. coli. In addition, The AF coatings exhibited favorable inhibition efficacy toward the growth and adhesion of Cyclotella sp., and the efficacy was enhanced with the increase of TiO2 content. It can be concluded that TiO2 nanoparticles endow the AF coatings with promoted fouling resistance properties.
研究领域:
材料科学
·
微生物学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Tianyan Zhong,Huangxin Li,Tianming Zhao,Hongye Guan,Lili Xing,Xinyu Xue
A new self-powered/self-cleaned atmosphere monitoring system has been fabricated from TiO 2 nanoparticles through combining hydrovoltaic, gas sensing and photocatalytic effects. The TiO 2 nanoparticle film can convert natural thermal energy into electricity (hydrovoltaic effect) by the spontaneous water evaporation. The hydrovoltaic/gas-sensing coupling effect of TiO 2 nanoparticle offers the water-evaporation-powered gas detection performance, and the outputting voltage/current has a good response to the surrounding gas atmosphere, directly acting as the gas sensing signal. The zeta potential of TiO 2 is changed by the surface adsorption of gas molecules, and thus affects the electricity output of the system. The outputting electricity can directly power a wireless transmitter for transmitting the sensing information to external platform, and the whole system can work independently without electricity power supply. The rainwater can be used as the fuel of the system, and thus the system can be used outdoors without scheduled maintenance. Moreover, the photocatalytic activity of TiO 2 can effectively degrade the organic pollutants on the film under photo illumination, leading to a self-clean behavior of the system. The system can probably promote the development of green sensing techniques with evaporation-induced ability.
研究领域:
材料科学
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环境科学
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能源技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）