COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Jihong Jiang,Han Wang,Junlin Lin,Zhiyong Liu,Laibo Li,Yali Li,Zongjin Li,Lingchao Lu,Yunjian Li,Zeyu Lu
Previous studies primarily considered TiO 2 as a nano-filler to accelerate cement hydration due to the nucleation site effect. However, hydroxyl free radicals (•OH), released from TiO 2 under UV irradiation, also exhibit great potential to accelerate cement hydration owing to their high nucleophilicity arising from unpaired electrons. This study is the first to reveal the accelerating mechanism of •OH generated by photoexcited nano-TiO 2 on cement hydration. Current experimental results indicated that 5.0 wt% addition of photoexcited nano-TiO 2 (under 6 h of UV irradiation during the early curing stage) improved the dissolution rate of tricalcium silicate (C 3 S) by 30 %, followed by a 35 % increase in the hydration degree of cement paste. More importantly, the polymerization degree and high-density content of C–S–H gels were also improved by 26 % and 13 %, accompanied by a 46 % reduction in porosity of the composites. All the aforementioned improvements were attributed to the presence of •OH generated by photoexcited nano-TiO 2 , which significantly accelerated cement hydration by accelerating C 3 S dissolution, facilitating faster nucleation and growth of C–S–H gels. In addition, the Density Functional Theory (DFT) calculations revealed that the accelerating effect of •OH on cement hydration may stem from the stronger interaction between •OH and the Ca ion on the C 3 S surface compared to the water molecule, and the increased surface nucleophilicity due to the dispersion of unpaired elections from •OH to all the O ions in the surface layer. These findings provide a high-efficiency approach to accelerate cement hydration by photoexcited nano-TiO 2 , thereby paving the way for the development of advanced and sustainable cement-based materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2018
·
IF 6.042
Hongyan He,Xiuhong Peng,Ying Yu,Zeming Shi,Mo Xu,Shijun Ni,Ying Gao
Photochemical vapor generation (PVG) is emerging as a promising analytical tool for Te determination, thanks to its efficient matrix separation, and simple and green procedure. However, the low PVG generation efficiency of Te is the bottleneck for its wide application in environmental samples containing trace Te. Herein, we reported a high efficient PVG for Te determination by synergistic effect of ferric ion and nano-TiO2. The analytical sensitivity was enhanced approximately 15-fold for Te(IV) in the presence of both ferric ions and nano-TiO2, comparing to conventional PVG. Besides, the use of nano-TiO2 can provide Te(VI) and Te(IV) an equal and high PVG efficiency in the presence of ferric ions, owned to the high photocatalytic performance of TiO2 under short-wavelength UV irradiation (254 and 185 nm). Under the optimized experimental conditions, a detection limit of 1.0 ng L–1 was obtained. The precision of replicate measurements was 2.3% (RSD, n = 7) at 0.5 μg L–1 for Te(IV). The methodology was validated by successful determination of Te in surface waters and two standard reference sediment samples. To our best knowledge, this is the first report of the synergistic enhancement of transitional metal ions and nano-TiO2 in PVG, which possesses potential for highly sensitive determination of vapor-forming elements.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Yu Zou,Fenghua Shen,Kaisong Xiang,Lele Liu,Haiyang Chen,Qu Yang,Hui Liu
Graphene oxide (GO) is a widely utilized functional anticorrosive material, whereas the presence of numerous oxygen functional groups on its surface tends to cause agglomeration, leading to decrease in anticorrosive properties. In this study, we designed a modification method by using dopamine and nano-TiO 2 to simultaneously enhance the corrosion resistance and thermal stability of GO. The Tafel curves and EIS tests demonstrate that GO modified with dopamine and nano-TiO 2 exhibits superior corrosion resistance. This can be attributed to the adhesive polydopamine formed through the self-polymerization of dopamine, which wraps around the surface of GO, resulting in better dispersion and uniformity of nano-TiO 2 . Additionally, TiO 2 serving as a passivation film enhances the barrier properties of the material. Furthermore, dopamine and nano-TiO 2 effectively cover the C O groups on GO surface, significantly improving its corrosion resistance. Besides, the thermal stability of GO is enhanced due to nano-TiO 2 possessing excellent thermal stability. The enhancement in both corrosion resistance and thermal stability of GO through dopamine and nano-TiO 2 modification is closely related to the amount of added nano-TiO 2 . This work provides valuable insights for simultaneously enhancing both thermal stability and corrosion resistance of GO.
研究领域:
材料科学
·
腐蚀科学
·
表面化学
✓ 已验证
DOI
高影响因子
NanoImpact
·
2016
·
IF 0
Xiaomei Shi,Zaixing Li,Wei Chen,Liwen Qiang,Junchao Xia,Meng Chen,Lingyan Zhu,Pedro J.J. Alvarez
Wastewater treatment plants (WWTPs) can be important point sources for the discharge of engineered nanomaterials to natural surface waters. In this study, we investigated the fate of nano-TiO 2 in two full scale WWTPs and their receiving streams in northern China (i.e., the Binhe and Minxin rivers, which flow to the Xiaohe River). High resolution transmission electron microscopy , energy dispersion X-ray spectroscopy and X-ray photoelectron spectroscopy analyses indicated that Ti in colloids present in the WWTP effluents and receiving streams originated mainly from engineered nano-TiO 2 . Most of the nano-TiO 2 (74–85%) in the influent sewage was removed by the activated sludge , but significant concentrations (27–43 μg/L Ti) remained associated with colloids in the effluents. Surprisingly, the total concentration of Ti in the receiving river streams was higher (52–86 μg/L), indicating the importance of other sources such as urban runoff. These relatively high Ti concentrations are unlikely to originate from natural sources since they are significantly higher than those in the nearby Yuqiao Reservoir (< 5 μg/L), representing regional background levels. Consistently, Ti levels in fish collected from the Xiaohe River (including muscle and other tissues) were significantly higher than those of fish from the reservoir. Overall, TiO 2 releases through WWTP effluents and other sources (including runoff) are contributing to the relatively high observed concentrations of suspended Ti in the Xiaohe River, which results in accumulation in edible fish tissue.
研究领域:
环境科学
·
生态毒理学
✓ 已验证
产品关联
DOI
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yu Liu,Yu Xiang,Hui Xu,Huili Li
Photocatalysis is highly efficient for the treatment of dyeing wastewater. However, the wastewater still contains a large amount of nano-TiO 2 after photocatalysis. In order to reduce the cost of nano-TiO 2 , different coagulants were used to improve the solid/liquid separation efficiency. At the same time, the reuse of flocs has raised increasing attention after coagulation. In this study, we report on the recycling of flocs for the production of AlCl 3 and TiO 2 formed flocs (AT 1 ) and Al 13 and TiO 2 formed flocs (AT 2 ) through a simple calcination process. Results indicated the flocs formation processes under different concentration of CO 3 2– were Al species distribution and coagulant dosage dependent. Without HA molecules, the reaction between Al-based coagulants and CO 3 2– are the controlling steps in the coagulation process, and Al a and Al b species had different reaction processes. The influence of HA molecules was also studied, and the HA-Al aggregates which could bridge the TiO 2 nanoparticles , and thus induce sweep flocculation . Consequently, highly enhanced aggregation rate, due to the heteroaggregation between these aggregates and TiO 2 was observed. After calcination, the AT 2 -10 and AT 2 -20 (CO 3 2– : 10, 20 mmol/L) with petal-like structures (mesoporous), relatively high specific surface areas, i.e. 83.98 m 2 /g and 78.38 m 2 /g and high photocatalytic degradation, i.e. 72.79%, 67.78% (compared to nano-TiO 2 , AT 1 -10 and AT 1 -20), were obtained. Additionally, oxygen vacancy (OV) was generated on the surface of the recycled AT 2 -10 and AT 2 -20, which display strong photocatalytic performance for the degradation of MO greater than 65%, under ultraviolet (UV) irradiation and without any sacrificial reagents. This study proposes a new perspective on recycling coagulated flocs for practical application in wastewater treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Liangfan Qu,Guiyun Chen,Shuang Dong,Yaoxing Huo,Zhonglin Yin,Shuhong Li,Ye Chen
Highly dispersible TiO 2 nanoparticles were prepared through the hydrolysis of titanium alcohol, and a series of TiO 2 -modified zein/chitosan (CS) films were prepared through a process involving blending, solution casting and evaporation. The mechanical properties and the antibacterial capacity of the zein/CS/TiO 2 films were characterized to explore the effects of different TiO 2 nanoparticle contents. Results showed that the addition of nanoscale TiO 2 remarkably improved the mechanical properties and thermal stability of the zein/CS/TiO 2 film. The tensile strength of the zein/CS/TiO 2 films significantly increased (p<0.05) with the increasing TiO 2 loadings in films, reaching a maximum of 28.33 ± 1.53 MPa at 0.15 wt % TiO 2 nanoparticles. The antibacterial effect of the composite films on Gram-positive bacteria ( S. aureus ) was more significant than that of Gram-negative bacteria ( E. coli and S. enteritidis ), and the antibacterial effect of UV light was better than that of dark conditions. In particular, the inhibition zones of zein/CS/TiO 2 (0.15%) film against E. coli , S. enteritidis and S. aureus under UV light condition increased by 21.78%, 21.45%, and 26.44%, respectively, compared with the control. This study suggested that adding highly dispersible TiO 2 nanoparticles is an effective method for improving the mechanical and antimicrobial properties of zein/CS films for various applications, such as medical and food packaging.
研究领域:
材料科学
·
生物学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 9
·2797-2809
·
IF 5.721
Moumita Maiti,Manas Sarkar,Donghong Liu
Nicotine (C10H14N2), a hygroscopic molecule, has long been the focus of intensive research due to its rising number of detrimental impacts on human health, associated with the neuroactive alkaloid in tobacco. Water contamination in the form of nicotine substances is a serious issue, where clean water is one of the basic demands for living systems. This study reports exclusively on nicotine degradation and adsorption activity from its aqueous solution through an anatase-phase nano-TiO2 (20 ± 5 nm)-decorated reduced graphene oxide (rGO–TiO2) composite under ultraviolet (UV) and visible-light irradiation, respectively. In this study, XRD, XPS, FT-IR, Raman, UV-DRS, TEM, and BET analyses were applied for the characterization of the structural, optical, and surface morphological properties of rGO–TiO2. About 80% nicotine (1 mM) decomposition was found using 2 mg rGO–TiO2 after 90 min of UV light exposure, while 60% nicotine (1 mM) adsorption at the surface of the rGO–TiO2 (3 mg) was detected within 90 min of visible light illumination. A kinetic study on free radical generation (O2˙−, ˙OH, 1O2) demonstrated that the rGO–TiO2 nanosystem had a substantial rate (1.7-fold higher than TiO2) of ROS formation. Raman shifts showed the defects in the sp3-hybridized carbon of rGO due to the attachment of TiO2 NPs, thereby altering the electronic energy states of the rGO–TiO2 nanocomposite and leading to its superior adsorption via π–π and cation–π interactions. Nicotine degradation was perceived to follow the pseudo-first-order kinetic law, while the nicotine-adsorption activity due to chemisorption on the disordered rGO–TiO2 surface could be expressed via the Langmuir isotherm model. The application of the rGO–TiO2 nanohybrid is highly suggested to be beneficial on an industrial basis for nullifying the nicotine-prompted carcinogenic effects in aquatic systems.
研究领域:
环境科学
·
材料科学
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Building Engineering
·
2024
·
IF 6.7
Jiaqi Zhu,Chang Chen,Xufu Wang,Shaowu Jiu,Yanxin Chen,Yan Liu
Rock wool, as an external wall insulation material, is crucial in improving the energy efficiency of structures. However, a large amount of rock wool furnace slag (RWFS) generated during the production of rock wool panels manufacturing causes environmental problems. To address these issues, this study focuses on the use of waste RWFS as a precursor in alkali-activated cementitious materials. In addition, the effect of anatase nano-TiO 2 (ANT) and rutile nano-TiO 2 (RNT) as an additive to the alkali-activated rock wool furnace slag cementitious materials (AARWFSCMs) was evaluated and quantified. Scanning Electronic Microscope (SEM), Isothermal Conduction Calorimetry (ICC), Fourier-Transform Infrared Spectroscopy (FT-IR), X-ray diffraction (XRD) analysis were used to identify the effects of modulus 1.0–1.8 water glass modulus (Ms; SiO 2 /Na 2 O), 3%–7% Na 2 O content on AARWFSCMs. Experimental tests was conducted to quantify the properties such as the setting time, the fluidity, the compressive strength of AARWFSCMs after hardening. Results found that the optimal content of Ms, Na 2 O content in preparing AARWFSCM were 1.4, 5 % for obtaining 28-d compressive strength of 96.36 MPa. The atomic percentage of Ca/Si of the hydration products in the AARWFSCMs fluctuated within 0.94–1.50. The hydration products were a mixture of C–S–H and C–A–S–H. Moreover, the experimental results illustrated that the nano-TiO 2 , which highly beneficial in improving the compressive strength of AARWFSCMs. The additions of 0.50 % ANT and 0.75 % RNT resulted in increments of 5.9 % and 12.8 % in the 28-d compressive strength of AARWFSCMs, respectively. The obtained results provide a new method of utilization of RWFS and improving the sustainability of the construction industry.
研究领域:
建筑材料学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2024
·
IF 3.8
Shubing Zhu,Xiaoning Tang
With the rapid development of industrialization and population surge in modern society, noise pollution has been considered as a serious threat to human beings. In order to effectively reduce noise, the application of sound absorbing textile materials has gradually increased, also the rapid development of acoustic coating consists of conventional fiber layers and polymers. In this work, the surface morphology, micro-structure and sound absorption properties of polyvinyl alcohol coated fabric and its composites were studied. It was found that the addition of nano-TiO 2 particles can obviously improve the sound absorption properties, and the absorption coefficient is related to fabric thickness. Furthermore, the surface of the coated fabric was compounded with melt-blown nonwoven fabric, thus to fabricate composite sound absorber. This work indicates the good feasibility and promising application prospect of lightweight polyvinyl alcohol coated fabrics in noise reduction engineering. Highlights Combination of fiber layers and polymers for acoustic coating materials. Adding inorganic nano-TiO 2 particles with different contents. Different modification methods to improve the dispersion of coating. Composite structure with reduced thickness and increased sound absorption.
研究领域:
材料科学
·
纺织工程
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 152
·期 11
·3453-3464
·
IF 2.936
Zhao Mengqi,Pan Zhiquan,Chen Qingrong,Zhou Hong
Diosgenin is an important intermediate of drugs, the special structure similar to hormone determines its important position in drug synthesis. Diosgenin was generally obtained by sulfuric acid hydrolysis of dioscorea, which produced too much acid wastewater, and caused environmental issues. A new solid acid based on TiO 2 was designed and synthesized through the sulfonation of the prepared TiO 2 , the structure was fully characterized by FTIR, SEM, EDX, XPS and XRD. Under the optimized conditions, the yield of diosgenin reached 30.75%, the value was much higher than that of H 2 SO 4 of the same quality. To explore the factors that affect the yield, the usage amount of the solid acid, the temperature, the solvent volume and the extraction time were taken into the analysis, and the results of the recycling experiments indicated that the prepared solid acid can be used for three time and maintain its high activity. A highly efficient solid acid catalyst for diosgenin extraction from saponins was successfully synthesized, and the extraction method was environmentally friendly. Graphical Abstract
研究领域:
药物化学
·
环境科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 11
·期 1
·60
·
IF 4.324
Xiong Wang,Wenqian Kang,Lin Gao,Guangquan Li,Xuerong Chen,Yi Guo
Porous organic polymers (POPs) have proven to be an efficient support in the olefin polymerization catalyst field. In this paper, nano TiO2beads were used to modulate the pore structure, bulk density, and surface morphology and flowability of the prepared POPs. With the incorporation of the hydrophilic nano TiO2beads, the prepared TiO2/POP supports obtained reasonable specific surface area (100–300 m2/g) and higher bulk density (0.26–0.35 g/mL) and flowability than the pure POP supports. The results show that bulk density of the prepared TiO2/POP particles increased when adding an increased amount of TiO2, and when 37.5% TiO2(weight percent to the total comonomers divinylbenzene (DVB) and 2-hydroxyethyl methacrylate (HEMA)) and 3:1 DVB/HEMA (molar ratio) were added, highly flowable TiO2/POP composites (POP-6 and POP-7) were obtained. With the modulation of the nano TiO2template during the support synthesis, the prepared POP-7 particles successfully achieved a normal distribution with a narrow particle size distribution (PSD) of 0.717 and average particle size of 24.1 μm, a specific surface area (SSA) of 279 m2/g, and relatively high bulk density of 0.30 g/mL. Furthermore, all the prepared TiO2/POP supports obtained higher ethylene polymerization activity than silica gel-supported commercial metallocene catalyst. The immobilized (n-BuCp)2ZrCl2/MAO@POP-7 catalyst exhibited the highest ethylene polymerization activity of 4794 kg PE/mol Zr.bar.h and productivity of 389 g PE/g cat, more than twice that of the commercial counterpart. Even higher catalyst productivity (3197 g PE/g cat) and bulk density of the produced PE (0.36 g/mL) could be obtained in higher ethylene partial pressure at 80 °C for 2 h, and the prepared TiO2/POP catalyst shows no obvious Zr+active sites decay during the ethylene polymerization.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Xue-Fei Chen,Xiangping Xian,Wei-Zhi Chen,Binmeng Chen
In this study, a pioneering methodology is delineated, wherein Fe 2 O 3 -enriched recycled red brick aggregates are harnessed as avant-garde carrier substrates, resulting in a profound enhancement of the intrinsic self-cleansing capabilities of TiO 2 . The innate porous core-shell architecture of these recycled aggregates engenders a notable synergistic interaction between nano-TiO 2 and Fe 2 O 3 , culminating in a marked escalation of photocatalytic efficiency. An exhaustive examination of the degradation proficiency across a spectrum of samples against methyl blue, conducted over a gradient of temporal intervals, has been executed. The findings indicate that the rates of degradation for all samples increase progressively with the prolongation of exposure to UV irradiation. The control group, consisting exclusively of white cement, demonstrated the most diminutive degradation rate, achieving merely a 4 % reduction in methyl blue concentration through UV irradiation alone. Conversely, the nano-TiO2-modified recycled grey brick aggregate (NT-RGBA) and recycled red brick aggregate (NT-RRBA) samples showcased substantially elevated degradation rates, a phenomenon attributable to the incorporation of photocatalytic agents capable of capitalizing on UV energy to expedite the degradation process of methyl blue. The NT-RRBA composite, an amalgamation of the photocatalytic attributes of TiO 2 , the synergistic interplay between Fe 2 O 3 and TiO 2 , and the intricate three-dimensional pore framework of RRBA, manifested the most pronounced degradation rate. To delve deeper into the determinants influencing the efficacy of photocatalytic degradation, a fuzzy inference system has been deployed to construct a mathematical model that scrutinizes the effects of variables such as the initial concentration of pollutants and the flow rate. This quantitative methodology affords to establish a functional relationship that encapsulates the underlying dynamics of the photocatalytic degradation phenomenon. Deploying this functional material, a derivative of construction detritus, paves the way for an innovative strategy of closed-loop resource utilization, marking a significant milestone towards sustainable development within the construction sector.
研究领域:
环境科学
·
材料科学
✓ 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）