CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Tong Chang,Yajun Hou,Fengze Wang,Yumei Wang,Yushui Bi
Semiconductor photocatalyst materials based on TiO 2 are potential photosensitizers for photodynamic therapy of cancer. Despite its effectiveness under ultraviolet light, pure TiO 2 shows almost no photocatalytic activity under visible light because of its wide intrinsic band gap energy (anatase, 3.2 eV). Besides, TiO 2 has no magnetic delivery property. In this study, an inorganic nanocomposite, N-TiO 2 /SiO 2 /Fe 3 O 4 , is successfully prepared in three steps by means of co-precipitation, Stöber and sol-gel methods. Deep characterization results by XRD , TEM, XPS , UV–vis DRS, FL and magnetic hysteresis loop reveal that N-TiO 2 /SiO 2 /Fe 3 O 4 has core-shell structure, magnetic property and visible-light-response capability. As a potential photosensitizer for photodynamic therapy, it shows a stronger photodynamic suppression effect on proliferation of HeLa cells than TiO 2 under the irradiation of xenon light.
研究领域:
材料科学
·
生物医学工程
·
肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yang Huang,Weihua Zhang,Maosheng Zhang,Xin Zhang,Yunmeng Zhao
In this study, salicylic acid-TiO 2 @SiO 2 @Ni/nZVI (SA-NFST) nanocomposites with rich hydroxyl groups were synthesized using in situ surface modified, co-precipitation, and sol-gel methods. A variety of techniques, including scanning electron microscopy (SEM), X-ray powder diffraction (XRD), vibrating sample magnetometer (VSM), transmission electron microscopy (TEM), the point of zero charge (PZC), UV–vis diffuse reflectance spectra (UV–vis), infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS), were used to characterize the properties of the nanoparticles. The results showed that the SA-NFST exhibited high visible light-harvesting efficiency, easily magnetic separation, rich hydroxyl groups and hydroxyl radicals, and larger surface area. The adsorption and photo-oxidation of arsenite by the new materials were explored in different experimental conditions, including pH, initial arsenite concentration, catalyst dosage, contact time, and coexisting anions (PO 4 3− , SiO 3 2− , CO 3 2− , and SO 4 2− ). The maximum adsorption capacities ( q m ) of As(III) onto SA-NFST calculated from Langmuir adsorption isotherm were 73.9 and 83.6 mg/g without and with visible light irradiation, respectively. >99.8% of As(III) (5.0 mg/L) was removed in the presence of 0.25 g/L SA-NFST nanoparticles (NPs) under 1.5 h visible light illumination. The residual concentration of As(III) (9.0 µg/L) was less than 10 µg/L, which is below the maximum allowable values in drinking water. As(III) removal may be due to the synergic combined effects of surface adsorption, photocatalytic oxidation under visible light illumination.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Ye Zhu,Zhixuan Cheng,Qun Xiang,Xikun Chen,Jiaqiang Xu
Mesoporous TiO 2 -SiO 2 functionalized with p-hexa-fluoroisopropanol aniline (HFIP) was designed and synthesized to achieve highly sensitive and selective sensing toward nerve agent simulant dimethyl methylphosphonate (DMMP) due to a hydrogen bonding between target DMMP and TiO 2 -SiO 2 -HFIP. The sensing experiments were conducted by coating compounds onto quartz crystal microbalance (QCM) transducers. It was found that the observed frequency shifts gradually and turned saturated in the range from 10 to 60 ppm. Gas sensing test results revealed that sensors had enhanced sensitivity due to the decoration of HFIP on TiO 2 -SiO 2 in a ppb level. Furthermore, when the doping of HFIP reached 20 wt%, the sensors achieved the best sensing performance. In conclusion, the QCM sensor coated with mesoporous TiO 2 -SiO 2 -HFIP exhibited fast response, excellent reversibility and high selectivity to nerve agent stimulant DMMP vapor, implying that mesoporous TiO 2 -SiO 2 -HFIP may be a good candidate for sensing DMMP.
研究领域:
材料科学
·
化学传感
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Chen Li,Liting Wei,Min Chen,Jiayi Zhang,Yang Yang,Boping Liu,Yulong Jin
CrO x /VO x /TiO 2 -SiO 2 was prepared via solvent-free and conventional wet-impregnation process with ethanol as solvent. The results of ICP-OES, N 2 adsorption-desorption, SEM-EDX, Raman and DR-Uv-vis spectra indicate that well-dispersed Cr and V sites in isolated state were the main species. Bimodal ultra-high molecular weight polyethylene/high-density polyethylene in-reactor blends (UHMWPE/HDPE IRBs) could be synthesized with polymerization activity ＞ 1×10 7 gPE·mol −1 Cr·h −1 . Moreover, the two catalysts displayed similar catalytic behaviors in temperature sensitivity, H 2 response and 1-hexene copolymerization efficiency, and their polymer products also show comparable molecular weight and molecular weight distribution , which implies analogous structures of their well-dispersed active sites. By contrast, the catalyst prepared by wet-impregnation process with water as solvent exhibited poor dispersity, which is reflected by its much lower activity and very different catalytic behaviors and polymer properties when compared with the well-dispersed catalysts. Therefore, the economic and green solvent-free process is promising for preparing highly-active CrO x /VO x /TiO 2 -SiO 2 .
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
ACS Omega
·
2023
·
IF 4.1
Lei Wang,Guangyuan Xie,Xiang Mi,Bin Zhang,Yu Du,Qiuyu Zhu,Zhicheng Yu
The grafted modification TiO2@SiO2 composite was fabricated by a liquid-phase deposition method with Na2SiO3 and a grafting reaction with a silane coupling agent. First, the TiO2@SiO2 composite was prepared, and the effect of deposition rate and silica content on the morphology, particle size, dispersibility, and pigmentary property of TiO2@SiO2 composites was investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and ζ-potential. The islandlike TiO2@SiO2 composite had a good particle size and printing performance compared with the dense TiO2@SiO2 composite. The presence of Si was confirmed by EDX elemental analysis and XPS, and a peak at 980 cm–1 belonging to Si–O was observed in the FTIR spectrum, confirming the presence of SiO2 anchored at TiO2 surfaces via Si–O–Ti bonds. Then, the islandlike TiO2@SiO2 composite was modified by grafting with a silane coupling agent. The effect of the silane coupling agent on the hydrophobicity and dispersibility was investigated. The peaks at 2919 and 2846 cm–1 belong to CH2 in the FTIR spectrum, and Si–C in the XPS confirmed the grafting of silane coupling agent to the TiO2@SiO2 composite. The grafted modification of the islandlike TiO2@SiO2 composite using 3-triethoxysilylpropylamine endowed it with weather durability, dispersibility, and good printing performance.
研究领域:
材料科学
·
化学
·
纳米技术
·
印刷技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Xiao-Qiong Wu,Zai-Dong Shao,Qing Liu,Zongli Xie,Fei Zhao,Yu-Ming Zheng
Semiconductor photocatalysis has long been considered as a promising approach for remediation of polluted water. However, the high recombination rate of electrons and holes, as well as a low reaction rate, have impeded its large-scale applications. Therefore, it is of great importance to develop appropriate photocatalysts for promoting its practical application. In this study, a novel TiO 2 /SiO 2 /carbon electrospun nanofiber mat (TSC NFM) with flexibility and porous hierarchy has been successfully designed and fabricated by a facile method of electrospinning and carbonization . Characterization results show that the TSC NFM consists of closely-packed and well-distributed anatase (TiO 2 ) nanocrystals , amorphous SiO 2 nanoparticles , and carbon with interconnected meso - and macro -pores. The photocatalytic performance of the TSC NFM was evaluated by degrading rhodamine B and 4-nitrophenol in batch systems. The results show that TSC NFM exhibits a higher photocatalytic activity than TiO 2 /SiO 2 nanofiber mat, which does not contain carbon. The enhanced performance of the TSC NFM can be attributed to the improved adsorption capacity toward the organic pollutants due to the presence of carbon and to the enhanced interfacial charge separation between TiO 2 nanoparticles and carbon. Besides, the as-prepared TSC NFM displays good stability and reusability. Notably, the flexible TSC NFM can be used in a continuous-flow reactor to efficiently treat wastewater. Our work provides new insights into the fabrication of carbon-based inorganic nanofiber mats, which have great potential in water treatment.
研究领域:
环境科学
·
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Qi Jiang,Jian Huang,Baoguo Ma,Zhengcai Yang,Ting Zhang,Xin Wang
TiO 2 @SiO 2 composite microspheres (TS) were prepared by the deposition of TiO 2 on the raspberry-like SiO 2 @polystyrene microspheres (PSS). The hollow microspheres with hierarchical microtopography possess both improved photocatalytic activity and stabilized TiO 2 particle structure. The results of energy dispersion spectrum (EDS) mapping, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) showed that after calcination, anatase TiO 2 nanoparticles has formed on the raspberry-like PSS template with preferred deposition among interstitials of the drupelet-like structure. The thermal degradation of the polystyrene (PS) core during calcination led to the hollow microspheres. The photocatalytic experiments indicated that the raspberry-like TiO 2 @SiO 2 composite microspheres (TS1-TS3) had higher photocatalytic efficiency than the smooth ones (TS0), due to the hierarchical and hollow structure. The sample TS2 prepared with a moderate ammonia concentration (3 %) not only had relatively more intact hollow spherical structure, but also enhanced photocatalytic activity. The hollow TiO 2 @SiO 2 composite microspheres (TS3) prepared with 4 % ammonia showed the best photocatalytic efficiency. However, the higher ammonia concentration made the drupelet-like structure unstable and the microspheres tend to disintegrate. The raspberry-like microstructure showed a protective effect on the loaded TiO 2 , which resulted in better recyclability with persistent photocatalytic activity. The hierarchical composite microspheres shed light on the potential effective utilization strategy of nano-photocatalyst.
研究领域:
材料科学
·
化学
·
纳米技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Ye Wang,Zhengxuan Hu,Guolong Wu,Xiaonan Zhang,Yanyi Yin,Lin Li,Jianhua Yao
In this study, laser-assisted micro-arc oxidation (LMAO) processing was carried out on Ti6Al4V alloy under laser powers of 30, 45, and 60 W, and the influence of the laser power on the microstructure and wear resistance of the coating was further investigated. The breakdown voltage and termination voltages of LMAO processing decrease gradually as the laser power increases. At the same time, micro-discharges increase in quantity. Within the suitable laser power range (30–45 W), the obtained coating continuously enhances uniformity, thickness, and density with rising power, contributing to higher hardness and adhesion strength . However, raising laser power to 60 W will damage the obtained coating due to the violent micro-discharges, which generate interconnected larger pores in the local area. Laser power also affects the coating's reaction process and phase transition. More electrolyte ions dope into the coating as a consequence of increasing laser power. The Si concentration of the LMAO-45 coating is the highest, whereas that of the LMAO-60 coating comparatively reduces due to localized coating detachment. Moreover, enhancing laser power is more conducive to forming SiO 2 and rutile-TiO 2 phases. Compared with the traditional MAO or other LMAO coatings, the LMAO-45 coating significantly improves wear protection, evidenced by the lowest COF value , the minimum wear rate, and the least peeling during the wear test . Low porosity, surface roughness , high thickness, and increased incorporation of the SiO 2 phase are responsible for the same. However, under 60 W of laser irradiation , the wear resistance of the resultant LMAO coating decreased due to the formation of local damaged areas.
研究领域:
材料科学
·
表面工程
·
生物医学工程
·
生物材料
·
机械工程
·
金属腐蚀与防护
·
纳米材料
·
医用植入材料
✓ 已验证
产品关联
DOI
高影响因子
ENERGY AND BUILDINGS
·
2020
·
IF 4.867
Sai Liu,Dongwei Zhang,Haihui Peng,Yue Jiang,Xingsen Gao,Guofu Zhou,Jun-Ming Liu,Krzysztof Kempa,Jinwei Gao
Smart windows have played a significant role in the privacy protection and energy savings in morden architectures. However, most of those either need complicated structures to operate, or have limited switching ability. In this paper, inspired by the structural properties and performance of the natural, self-forming cracking pattern, combined with the core–shell TiO 2 @SiO 2 particles, two kinds of smart windows have been demonstrated (the “valley” and “mountain” types) based on the way these particles accumulate. We demonstrate, that the inexpensive, soft processed “valley”-type device shows on/off transmittance change as high as 41%. In addition, it has good dynamic tunability, stability, mechanical flexibility, as well as high ultraviolet and near infrared light blocking.
研究领域:
材料科学
·
光学
·
纳米技术
·
能源效率
✓ 已验证
DOI
高影响因子
Journal of Chemistry
·
2019
·
IF 1.727
Shiyun Tang,Jingyu Ran,Junjiang Guo,Anjiang Tang
To obtain high stable and effective TiO2 photocatalyst, nano-N-doped TiO2@SiO2 (TiO2−xNx@SiO2, 0 ≤ x ≤ 2) composite aerogels were synthesized by the sol-gel method combined with supercritical drying and direct oxidation process. The adsorption/photocatalytic degradation efficiency of TiO2−xNx@SiO2 aerogels was evaluated by the degradation of RhB in aqueous solution under visible light irradiation. The physiochemical properties of the aerogels were examined by XRD, FT-IR, TEM, SEM, TG/DTA, and BET methods. It was found that the specific surface areas of all TiO2−xNx@SiO2 samples exceeded 700 m2/g and exhibited a honeycomb porous structure with fine particulate morphology. Photocatalytic activity tests show that the 500-TiO2@SiO2 composite aerogel exhibits the best adsorption/photocatalytic degradation rate for RhB, which obtained about 80% of the degradation rate in 30 min under visible light and over 95% after 120 min. On the one hand, the SiO2 aerogels can significantly inhibit the phase transition of TiO2, and the nano TiO2 can be highly dispersed in the SiO2 aerogels; On the other hand, if the oxidation temperature is selected properly, the N-doped TiO2−xNx@SiO2 aerogel can be obtained by simple TiN@SiO2 aerogel oxidation.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2020
·Vol. 97
·期 2
·398-407
·
IF 2.721
Zhang Huilan,Wang Juan,Zhang Wen,Han Dong,Zhang Aiping
In the paper, a composite TiO 2 /SiO 2 -NHOC-FA was prepared using the coupling method which is a folic acid-targeted silica-coated titanium dioxide. Their structures were characterized by Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), X-ray diffraction (XRD), transmission electron microscope (TEM) and zeta potential method. The results showed that the average diameter of the prepared TiO 2 /SiO 2 -NHOC-FA composite is 18 nm, which is spherical. Compared with unmodified TiO 2 , TiO 2 /SiO 2 -NHOC-FA composite had superior water solubility and dispersion, and enhanced its photokilling activity by folic acid-targeted to FR (+) cells. In addition, photocatalytic TiO 2 /SiO 2 -NHOC-FA arrested cell cycle in G2/M phase of MCF-7 cells, resulting in a significant reduction of mitochondrial membrane potential (MMP), and also made the apoptosis rate, ROS components and intracellular calcium concentration increased. It killed the MCF-7 cells through apoptosis pathway. These results for the TiO 2 /SiO 2 -NHOC-FA composite can provide a theoretical basis for the photodynamic development of TiO 2 .
研究领域:
纳米技术
·
癌症研究
·
光催化
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 38
·19939-19944
·
IF 3.708
Huilin Hou,Lin Wang,Fengmei Gao,Guodong Wei,Jinju Zheng,Bin Tang,Weiyou Yang
While TiO2 nanoparticles are one of the most promising photocatalysts, their applications have been greatly hindered by easy aggregation. One of the effective routes to solve this problem is to incorporate them on/in a solid carrier. In this paper, we report the fabrication of hierarchically porous TiO2/SiO2 fibers via an electrospinning technique combined with subsequent high-temperature calcination treatment, in which the hierarchically porous SiO2 fibers confer a platform to assemble TiO2 nanoparticles with a uniform spatial distribution. The resultant hierarchically porous TiO2/SiO2 fibers have shown an enhanced photocatalytic activity with ∼95% degradation of rhodamine B as compared to ∼75% using our synthesized TiO2 nanoparticles and ∼77% using commercially available Degussa P25 after 120 min illumination.
研究领域:
材料科学
·
环境催化
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）