Nanomaterials
·
2022
·Vol. 12
·期 17
·3019
·
IF 5.719
Jiaqi Chen,Jian Gao,Xiaoyang Liu,Pan Wang,Xue Yu,Feng Zhao,Yan Sun,Wei Feng,Qingyuan Wang
Degradation of organic pollutants, especially organic dyes and antibiotics, by semiconductor photocatalysts is an efficient strategy for wastewater treatment. TiO2nanomaterials are considered to be promising photocatalysts due to their high chemical stability, high efficiency and availability. Anatase TiO2generally has superior photocatalytic activity to the rutile phase. However, the anatase phase can be irreversibly transformed to rutile phase when calcined at an elevated temperature. Methods to improve the stability of anatase are especially important for the TiO2gas sensors working at high temperatures. The addition of strong acids can effectively suppress this transformation process. However, these strong acids are relatively expensive, corrosive and environmentally unfriendly. Herein, oxalic acid (OA) as a natural acid was used to control the hydrolysis process of tetrabutyl titanate (TBOT), leading to controllable crystalline phase transformation and reduced crystalline size of TiO2on the nanoscale. What is more, the photocatalytic degradation performances were enhanced continuously when the molar ratio of OA to TBOT increased. The degradation reaction rate constants of CT650-R25 were about 10 times that of CT650-R0. The mechanism study shows that the enhanced photocatalytic activity can be attributed to the improved dispersibility, increased specific surface area and reduced recombination rates of photo-induced charge carriers and decreased energy bands as the concentration of OA increased. Thus, this work provides a simple, mild and effective method for controlling the crystalline forms of nano-TiO2with enhanced photocatalytic performance towards waste water treatment.Keywords:TiO2;photocatalyst;inhibitor;phase transformation
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2014
·
IF 3.499
Yanjie Li,Chen Yang,Xuetao Guo,Zhi Dang,Xiaoqin Li,Qian Zhang
In this study, humic acids (HAs) from three sources, peat, sediment and straw, used to coat nano-TiO 2 were investigated. The results indicated that HAs isolated from peat were aromatic-rich, whereas those isolated from sediment and straw were aliphatic-rich. The nano-TiO 2 sedimentation experiments indicated that the presence of aromatic-rich HAs was more capable of stabilizing nano-TiO 2 particles than was the presence of aliphatic-rich HAs. This result is because the deionized phenolic groups in the HAs were preferentially adsorbed on the nano-TiO 2 surfaces, which generated a higher charge density on the nano-TiO 2 surfaces and caused stronger repulsive forces among particles. Furthermore, the aromatic-rich TiO 2 -HA complexes exhibited a greater sorption capacity than the aliphatic-rich TiO 2 -HAs complexes and nonlinear phenanthrene sorption because of their higher affinity and the condensed state of aromatic fractions. Note that natural organic matters, such as humic acids, in aquatic environments can not only increase the stability of nanoparticles but can also influence the mobility of hydrophobic organic compounds (HOCs).
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2017
·
IF 2.858
Xian-Wei Cheng,Jin-Ping Guan,Xu-Hong Yang,Ren-Cheng Tang
This research work reported a novel approach to develop flame retardant silk fabric using naturally occurring phytic acid (PA) rich in phosphorus and TiO 2 nanoparticles through a pad-dry-cure technique. A polycarboxylic acid [1,2,3,4–butanetetracarboxylic acid (BTCA)] was employed to stabilize and improve the adhesion of TiO 2 on silk surface. The flame retardancy of the treated silk fabric was determined in terms of limiting oxygen index, vertical burning, and pyrolysis combustion flow calorimetry, and the durability of flame retardancy to washing was discussed. PA and TiO 2 were found to have a joint flame retardant effect. The combination of PA, TiO 2 and BTCA was able to endow silk fabric with excellent flame retardancy, and the good flame retardant ability was kept even after 25 times of washing. The reasons for the good washing durability of the treated silk fabric were discussed. Finally, a significant condensed-phase flame retardant mechanism of the silk fabric treated with the PA/TiO 2 /BTCA system was revealed by the analyses of thermogravimetry and pyrolysis combustion flow calorimetry.
研究领域:
纺织科学
·
材料科学
✓ 已验证
DOI
高影响因子
FERROELECTRICS
·
2018
·
IF 0.728
Yuguo Zhuo,Jun Liu,Qingshan Li
Nano-TiO2/MDI-50 based waterborne polyurethane composites were prepared with MDI-50, polypropylene glycol (PPG) and nano-TiO2 as main materials. Nano-TiO2 was modified using r-aminopropyltriethoxysilane (KH550) as modifier in order to improve the dispersion of nano-TiO2 in WPU. The composites morphologies and physical states were investigated using scanning electron microscopy (SEM), thermogravimetry analysis (TG), fourier transform infrared (FTIR) spectroscopy and UV-visible (UV-Vis) spectroscopy. Scanning electron microscopy observations revealed that modified nano-TiO2 has good dispersibility. Results from FTIR and TG suggested that the modified nano-TiO2 had been successfully introduced to the polyurethane molecular chain and the thermal decomposition temperature of nano-TiO2/MDI-50 based waterborne polyurethane composites doubled under the same thermal weight loss. Results from UV-Vis suggested that when 2% of modified nano-TiO2 was added, maximum absorbance of composites were significantly improved and was twice higher than that of pure waterborne polyurethane.
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
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2025
·
IF 6
Leming Zhen,Qiyuan Qin,Zhaofu Meng,Na Sun,Ze Liu,Ruohan Cheng,Can Xu,Wenhui Liu,Jingbing Xue
With the development of the nanotechnology industry, the possible coexistence of engineering nanoparticles with organic and heavy metal pollutants in aquatic systems has become a hot issue. However, how different nanoparticles affect the environmental behavior of oxytetracycline (OTC) − copper (Cu 2+ ) complex pollution remains unclear. In this study, we investigated the complex adsorption behavior of nano-TiO 2 and graphene oxide (GO) to OTC and Cu 2+ in water, and the differences of adsorption mechanism are discussed with characteristics analyses. When OTC and Cu 2+ coexist, Cu 2+ formed complexes with OTC, consuming oxygen-containing functional groups of OTC and reducing its adsorption on both nanoparticles. OTC does not affect Cu 2+ adsorption on nano-TiO 2 , but promotes Cu 2+ adsorption on GO. The OTC adsorption on nano-TiO 2 was primarily driven by hydrogen bonding and electrostatic attraction, leaving it with potential mobility. In contrast, the adsorption of OTC on GO was mainly through electrostatic attraction, π-π complexation and hydrogen bonding, and OTC reduced GO to rGO. These strong interactions stabilized OTC on GO surface, reducing its environmental mobility. The results of the research are of great environmental significance for exploring the impact of engineered nanoparticles discharged from industrial production in water on the combined pollution of OTC and Cu 2+ .
研究领域:
环境科学
·
纳米技术
·
水污染
✓ 已验证
产品关联
DOI
高影响因子
CEMENT & CONCRETE COMPOSITES
·
2025
·
IF 13.1
Jihong Jiang,Yanchun Miao,Qianping Ran,Yali Li,Yunjian Li,Zongshuo Tao,Zeyu Lu
Fly ash, a by-product of coal combustion, is a pozzolanic solid waste with annual production of 1.63 billion tonnes, which has been widely used to replace cement clinker to develop sustainable concrete. However, the incorporation of high volumes of inert fly ash significantly reduces the early mechanical strength of concrete due to its low pozzolanic activity. This study presents an innovative strategy to effectively enhance the reactivity of fly ash by utilizing hydroxyl free radicals (•OH), highly reactive oxidative species generated by nano-TiO 2 under UV light excitation. Experimental results demonstrated that photoexcited nano-TiO 2 significantly promoted the depolymerization of inert glassy phases in fly ash, resulting in a 28 % increase in Ca(OH) 2 consumption within 72 h. Consequently, the compressive and flexural strengths of mortar at 28 days increased by 37 % and 16 %, respectively, with a strength activity index reaching 95.4 %. In addition, the water absorption and chloride ion diffusion coefficient were reduced by 15 % and 18 %, respectively, due to a more refined pore structure driven by enhanced pozzolanic reactivity. Density Functional Theory (DFT) calculations further revealed that •OH substantially lowered the energy barrier for Si-O-Al bonds cleavage (from 22.93 kcal/mol for OH − to 8.54 kcal/mol for •OH), confirming its superior catalytic efficiency and thermodynamic advantage. In conclusion, the findings confirm that photoexcited nano-TiO 2 can serve as an effective activator for enhancing the utilization efficiency of fly ash in sustainable concrete.
研究领域:
建筑材料学
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可持续发展工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Jiayao Yang,Hengxu Wang,Xiaohuan Liu,Shenyuan Fu,Pingan Song
The intrinsic brittleness has significantly restricted practical applications of epoxy resins. Existing toughening strategies often lead to degraded mechanical strength . Hence, it has been attractive but a huge challenge to design high-performance sustainable additives that can simultaneously improve strength and toughness of epoxy resins. Here, we report the synthesis of a nano-TiO 2 /regenerate cellulose (RC) biohybrid via a facile microwave method for strengthening and toughening a soft epoxy resin system (modulus below 1 GPa). Our results show that with 10 phr nano-TiO 2 /RC, the resultant epoxy composite exhibits simultaneous enhancements in tensile strength and impact toughness , ca. 38% and 40% higher than corresponding values of virgin epoxy resin because of improved interfacial compatibility. Moreover, the addition of as-designed nano-TiO 2 /RC can enhance thermostability of epoxy resin. It has a slightly negative effect on the curing reaction but does not change the curing mechanism of epoxy resins. This study provides a facile, efficient and green method for preparing bifunctional additive for creating strong and tough epoxy composites, which are expected to find wider applications in industries.
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
Materials
·
2014
·Vol. 7
·期 5
·3786-3801
·
IF 1.879
Ruxangul Jamal,Yakupjan Osman,Adalet Rahman,Ahmat Ali,Yu Zhang,Tursun Abdiryim
Poly(3,4-propylenedioxy-2,2′:5′,2″-terthiophene)/TiO2and poly(3,4-(2,2-dimethylenepropylenedioxy)-2,2′:5′,2″-terthiophene)/TiO2nanocomposites were synthesized by a simple solid-state method. Additionally, the poly(3,4-propylenedioxy thiophene)/TiO2and poly(3,4-2,2-dimethylenepropylenedioxythiophene)/TiO2nanocomposites were synthesized in a similar manner for comparison. The structure and morphology were characterized by Fourier transform infrared (FTIR), ultraviolet-visible (UV-Vis) absorption spectroscopy, X-ray diffraction (XRD) and transmission electron microscopy (TEM). The photocatalytic activities of the nanocomposites were examined through the degradation processes of a methylene blue (MB) solution under UV light and sunlight irradiation. The results of FTIR and UV-Vis spectra showed that the composites were successfully synthesized by solid-state method and the poly(3,4-propylenedioxy-2,2′:5′,2″-terthiophene)/TiO2and poly(3,4-(2,2-dimethylenepropylenedioxy)-2,2′:5′,2″-terthiophene)/TiO2nanocomposite had a higher oxidation degree and conjugation length than others. The results also indicated that the TiO2had no effect on the crystallinity of composites, but was well embedded in the polymer matrix. Additionally, the highest degradation efficiency of 90.5% occurred in the case of the poly(3,4-propylenedioxy-2,2′:5′,2″-terthiophene)/TiO2nanocomposite.Keywords:polyterthiophene derivative;nano-TiO2;solid-state method;photocatalyst
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Tian Zhang,Danping Jiang,Yameng Li,Huan Zhang,Zhiping Zhang,Francesco Petracchini,Valerio Paolini,Yang Zhang,Tian Yue,Quanguo Zhang
This study explored the interrelationship between nano-TiO 2 addition and photo-fermentative hydrogen production (PFHP) of corn straw. The maximum cumulative hydrogen volume (CHV) was up to 688.8 mL under the optimal photo-fermentative process conditions with nano-TiO 2 addition of 300 mg/L. Initial pH and interaction between substrate concentration and light intensity had highly significant effects on PFHP of corn straw with nano-TiO 2 addition. With the improvement of CHV, nano-TiO 2 addition decreased the optimal initial pH and substrate concentration for PFHP of corn straw. Moreover, nano-TiO 2 addition promoted the metabolism of butyric acid and acetic acid by photosynthetic bacteria HAU-M1, and significantly reduced the total concentration of intermediate byproducts during hydrogen production to a low level of 1.6–2.5 g/L, thus making the CHV, maximum hydrogen production rate (HPR) and average hydrogen content (HC) increased by 32.6%, 27.9% and 8.3% respectively over the control without nano-TiO 2 addition.
研究领域:
环境生物学
·
能源微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SURFACE AND INTERFACE ANALYSIS
·
2021
·Vol. 54
·期 2
·156-164
·
IF 1.607
Li Jian
The TiO 2 is grafted by triethylamine and is introduced on the surface of the carbon fiber, which improves the wettability and activity of the carbon fiber surface and at the same time strengthens the carbon fiber/polyimide composite. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) confirmed the triethylamine grafting successfully on TiO 2 . Scanning electron microscope (SEM) results show that when the trimethylamine concentration is 1.0%, a uniform coating is formed on the surface of the carbon fiber. The interlaminar shear strength (ILSS) and interfacial shear strength (IFSS) were increased by 32% and 69%, respectively.
研究领域:
材料科学
·
复合材料
✓ 已验证
DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 8
·914
·
IF 2.881
Zihao Dong,Ran Li,Yan Gong
With chitosan, nano-TiO2and nano-Ag as raw materials, nano-TiO2and nano-TiO2-Ag were modified by a surface modifier-sodium laurate. Chitosan (CTS), chitosan-nano-TiO2(CTS-TiO2), and chitosan-nano-TiO2-nano-Ag (CTS-TiO2-Ag) composite materials and corresponding films were prepared by a solution co-blending method. Then, the antibacterial performances of the above three types of materials againstEscherichia coli,Staphylococcus aureus, andBacillus subtiliswere compared. Moreover, potato and strawberry weight loss rates, peroxidase activity, and vitamin C contents after different film coating treatments were measured. Compared with CTS films, the CTS-TiO2-Ag and CTS-TiO2composite films both showed better physical properties, and both demonstrated higher antibacterial effects, especially forE.coli. Measurement of physiological indices in fruits and vegetables showed that the freshness-preserving effect of CTS-TiO2-Ag coating films was the most significant. In all, the CTS-TiO2-Ag coating films can actively contribute to the storage of fruits and vegetables at room temperature, and better ensure product quality. Thus, such films are meaningful for research and development of new fruit freshness-keeping techniques and materials.
研究领域:
食品科学
·
材料科学
✓ 已验证
DOI
高影响因子
Heliyon
·
2024
·
IF 3.4
Shibin Wu,Jingguang Wang,Zhenze Xie,Chang Du
Nano-TiO 2 photocatalysis technology has attracted wide attention because of its safety, nontoxicity and long-lasting performance. However, traditional nano-TiO 2 has been greatly limited in its application because its wide band gap can only be activated by ultraviolet light (λ < 387 nm). In this paper, nano-TiO 2 was prepared by self-doping method. The synthesized nano-TiO 2 was a single anatase crystal type with a particle size of 10 nm and uniform size. In addition, nano-TiO 2 has high stability and good dispersion. More importantly, nano-TiO 2 exhibits excellent visible light (400–780 nm) activity due to the decrease of bandgap from 3.20 eV to 1.80 eV (less than 2.0 eV) and the presence of a large number of hydroxyl groups on the surface of the nanoparticles. In the antibacterial test, the antibacterial rate of both E.coli and S.aureus was close to 100 % under the irradiation of household low-power LED lamps, showing excellent antibacterial performance, indicating that the prepared nano-TiO 2 has broad application prospects in the field of bactericidal and bacteriostatic.
研究领域:
材料科学
·
环境科学
·
生物学
✓ 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）