PROGRESS IN ORGANIC COATINGS
·
2016
·
IF 2.632
Chunling Wang,Xinxin Sheng,Delong Xie,Xinya Zhang,Huiping Zhang
High performance TiO 2 /polymer nanocomposites with enhanced thermal and excellent UV-shielding properties have been successfully prepared by means of the anatase TiO 2 nanoparticles homogeneously dispersed in the poly (methyl methacrylate/butyl acrylate/methacrylic acid) [P (MMA/BA/MAA)] matrix via a miniemulsion polymerization process. Highly crystalline TiO 2 nanoparticles with 5–8 nm diameter, were synthesized by a non-aqueous process and then modified with γ-Methacryloxypropyltrimethoxysilane (A174) to improve the compatibility with polymer. FTIR, TGA and dispersity tests in monomers/water verify that the A174 is chemically bonded onto the surface of TiO 2 nanoparticles. TEM, SEM and EDS analyses indicate that the TiO 2 nanoparticles are homogeneously dispersed in the polymer matrix. TGA and DSC studies confirm that the thermal properties of the resultant nanocomposites are significantly enhanced with respect to the neat polymer. UV–vis transmission spectra results reveal that the films with TiO 2 nanoparticles has an excellent UV-shielding property, even at 1.5 wt% TiO 2 nanoparticles loading can almost block the UV light below 350 nm while still having a high visible transparency. Therefore, the resultant nanocomposite films could be used as transparent UV-shielding 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
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Ailan Qu,Haolong Xie,Xinmei Xu,Yangyu Zhang,Shengwu Wen,Yifan Cui
Graphene quantum dots (GQDs) with high quantum yield (about 23.6% at an excitation wavelength of 320 nm) and GQDs/TiO 2 nanotubes (GQDs/TiO 2 NTs) composites were achieved by a simple hydrothermal method at low temperature. Photoluminescence characterization showed that the GQDs exhibited the down-conversion PL features at excitation from 300 to 420 nm and up-conversion photoluminescence in the range of 600–800 nm. The photocatalytic activity of prepared GQDs/TiO 2 NTs composites on the degradation of methyl orange (MO) was significantly enhanced compared with that of pure TiO 2 nanotubes (TiO 2 NTs). For the composites coupling with 1.5%, 2.5% and 3.5% GQDs, the degradation of MO after 20 min irradiation under UV–vis light irradiation (λ = 380–780 nm) were 80.52%, 94.64% and 51.91%, respectively, which are much higher than that of pure TiO 2 NTs (35.41%). It was inferred from the results of characterization that the improved photocatalytic activity of the GQDs/TiO 2 NTs composites was attributed to the synergetic effect of up-conversion properties of the GQDs, enhanced visible light absorption and efficient separation of photogenerated electron-holes of the GQDs/TiO 2 composite.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
2020
·Vol. 75
·期 1
·115-122
·
IF 1.68
Gao Jie,Zhang Lingfan,Qian Junchao,Chen Feng,Zhang Wenqing
N-doped TiO 2 fiber membranes were prepared by electrospinning method and adsorptive chitosan was added as a nitrogen source. The obtained TiO 2 fiber membranes were analyzed by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The results show that the film has adsorption properties; furthermore, the morphology of the TiO 2 fiber with a chitosan content of 0.5 g after calcination provides the best catalytic performance; An anatase–rutile titania was found in the oxidized fiber film found in the Raman spectrum TiO 2 ; XPS demonstrated that the introduction of chitosan could replace N atom with partial lattice oxygen in TiO 2 . Moreover, the degradation rate of methylene blue of the material was about 60–80% after 4-h reaction, and the maximum degradation rate was achieved by nanofiber film with chitosan concentration of 0.5 g.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2022
·
IF 3.574
Cunfang Zhang,Xinyan Zhang,Song Chen,Jianan Zhang,Shuaishuai Li,Xiaona Li,Toshiyuki Ikoma,Weiyi Chen
Novel silk fibroin-decorated TiO 2 nanowire microspheres were synthesized through in situ decoration of TiO 2 nanowire microspheres with silk fibroin. They exhibited a hierarchical and fibrous structure with a diameter of 400–500 µm and consisted of numerous nanowires with the diameter of 10–20 nm. After incubation with fibroblast L929 cells, they showed an enhanced biocompatibility due to the presence of silk fibroin in contrast to TiO 2 nanowire microspheres.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2021
·Vol. 36
·期 3
·338-346
·
IF 0.957
Shan Hailin,Du Yue,Du Xiaodi,Lei Jiaheng
In order to reduce the emission of SO x in the environment, sulfur compounds must be removed efficiently from fuels. Three-dimensional highly ordered meso-macroporous HPW/TiO 2 (3DO m/M HPW/TiO 2 ) materials were synthesized successfully by sol-gel method and applied as oxidative desulfurization catalyst for the model fuel. The characterization results displayed the existence of highly ordered meso-macroporous structures and the Keggin type of HPW was highly dispersed in TiO 2 framework. The effect of catalyst on desulfurization under different reaction conditions was studied systematically. The results showed that the catalyst exhibited excellent desulfurization performance in the hydrogen peroxide oxidation system, which could be explained by the unique meso-macroporous structure of catalyst. In addition, the catalyst showed good cycling performance and the removal rate of DBT still reached 96.1% even after 6 cycles, providing a feasible method for the development and application of fuel deep desulfurization catalysts.
研究领域:
催化材料
·
环境科学
·
能源化工
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 81
·77777-77785
·
IF 3.289
Lili Yan,Jiaolong Qin,Long Kong,Huibo Zhi,Mingxing Sun,Guoqing Shen,Liang Li
A novel and improved protocol was developed to prepare CuInS2/ZnS:Al-sensitized TiO2 (CIS/ZnS:Al–TiO2) nanocomposites for 1,3-dichloropropene (1,3-D) photodegradation. Response surface methodology was employed to model and optimize the operational parameters of this protocol. The CIS/ZnS:Al quantum dot (QDs) content, ZnS:Al coating time, and TGA/TiO2 molar ratio were chosen as independent variables at three levels by using the Box–Behnken design; their combined effects on the 1,3-D degradation efficiency were investigated. The synthesized CIS/ZnS:Al QDs and CIS/ZnS:Al–TiO2 nanocomposites were characterized by their photoluminescence intensity, UV-vis absorption spectra, X-ray diffraction, and transmission electron microscopy. Based on the experimental results, an empirical expression was established and subsequently applied to predict the 1,3-D degradation efficiency with the prepared photocatalysts. The predicted degradation efficiencies matched well with the experimental values (R2, 0.9874). The ANOVA results showed that the significance of the parameters was ZnS:Al coating time > QDs content > TGA/TiO2 molar ratio. The 3D response surface plots indicated that the optimum synthesis parameters were a CIS/ZnS:Al QDs content of 23%, a coating time of 418 min, and a molar ratio of 1.6. The 1,3-D degradation efficiency with the optimized photocatalyst reached 92% under an irradiation time of 5 h. The photodegradation kinetics of 1,3-D was well fitted with a pseudo-first-order kinetic equation. The experimental design and theoretical prediction methods in this work are of great significance in the design and development of high-performance CIS/ZnS:Al–TiO2 nanocomposites.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Zhen Tang,Longhua Xu,Kaiqian Shu,Jie Yang,Haijun Tang
The spread application of Titanium dioxide (TiO 2 ) is severely limited by the rapid recombination of photogenerated electron-hole pairs (e - -h + ). For many applications, two-dimensional (2D) molybdenum disulfide (MoS 2 ), with large specific surface area and sufficient active sites, has been widely researched as a beneficial support for TiO 2 photocatalytic activity enhancement. The synthesized heterostructures , the 2D MoS 2 nanosheets loaded with brown TiO 2 particles (b-TiO 2 @MoS 2 ) were manufactured through an ultrasound aided electrochemical exfoliation of natural bulk molybdenite coupled with sol-gel technique at low temperature (180 ºC). SEM, TEM , HRTEM, XRD , XPS , UV–vis absorption, Raman, PL spectra, and photocurrent analysis were used to investigate the morphology, microstructure, composition , and charge separation property of the samples. It was determined that b-TiO 2 @MoS 2 heterostructures had photocatalytic activity by observing their degradation of butyl xanthate during 120 min of visible light irradiation. Furthermore, the photocatalytic effectiveness of the 1 wt% b-TiO 2 @MoS 2 heterostructures is 94.80%, with a maximum rate constant (k value) of 0.01764 min −1 . In contrast to brown TiO 2 , the findings indicated that the b-TiO 2 @MoS 2 heterostructures enhanced visible light absorption, the expansion of active sites, the separation and transfer of photogenerated charges. A probable degradation mechanism of photodegradation butyl xanthate and charge transfer process of b-TiO 2 @MoS 2 heterostructures under visible light irradiation were also postulated.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Caixia Deng,Shuang Li,JiaYu Wang,Qiang Yang,Hui Chen,Fenglin Tang,Xiupei Yang
In this work, flower-like TiO 2 (TiO 2 -F) was first prepared by modulating the morphology of TiO 2 , and then, α-Fe 2 O 3 was loaded onto TiO 2 -F to successfully prepare α-Fe 2 O 3 /TiO 2 -F heterojunction materials. The material showed excellent degradation properties of doxycycline hydrochloride under visible light. The photocatalytic degradation efficiency of α-Fe 2 O 3 /TiO 2 -F2 for doxycycline hydrochloride under visible light reached 95.76 % in 120 min, and its pseudo-first-order degradation rate constant was 0.02647 min −1 , which was 3.68 and 2.01 times higher than those of α-Fe 2 O 3 and TiO 2 alone, respectively. This good photocatalytic performance is attributed mainly to the introduction of α-Fe 2 O 3 to form a Type II heterojunction with floral TiO 2 (TiO 2 -F), which is capable of promoting the separation of electron–hole pairs of photocatalysts and exhibiting a stronger redox capacity. The material exhibits notable stability and maintains high degradation efficiency even after undergoing multiple cycles. Furthermore, free radical trapping experiments and electron spin resonance (ESR) characterization revealed that hydroxyl radicals play a dominant role in this system. Finally, the degradation pathways were analyzed, and relevant toxicological analyses were performed, indicating that the toxicity of doxycycline hydrochloride gradually decreased during the photocatalytic degradation process.
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
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Zhiguo Cheng,Kui Cheng,Wenjian Weng
Light-induced cell detachment shows much potential in in vitro cell culture and calls for high-performance light-responsive films. In this study, a smooth and dense SiO2/TiO2 nanocomposite thin film with thickness of around 250 nm was first fabricated on H2O2 treated polystyrene (PS) substrate via a low-temperature sol–gel method. It was observed that the film could well-adhere on the PS surface and the bonding strength became increasingly high with the increase of SiO2 content. The peeling strength and shear strength reached 3.05 and 30.02 MPa, respectively. It was observed the surface of the film could transform into superhydrophilic upon 20 min illumination of ultraviolet with a wavelength of 365 nm (UV365). In cell culture, cells, i.e., NIH3T3 and MC3T3-E1 cells, cultured on SiO2/TiO2 nanocomposite film were easily detached after 10 min of UV365 illumination; the detachment rates reached 90.8% and 88.6%, respectively. Correspondingly, continuous cell sheets with good viability were also easily obtained through the same way. The present work shows that SiO2/TiO2 nanocomposite thin film could be easily prepared on polymeric surface at low temperature. The corresponding film exhibits excellent biocompatibility, high bonding strength, and good light responses. It could be a good candidate for the surface of cell culture utensils with light-induced cell detachment property.
研究领域:
材料科学
·
生物医学工程
·
细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2019
·
IF 2.752
Dong Chen,Yanting Lu,Jiaojiao Wu,Nan Li,Yan-Zhen Zheng,Xia Tao
In this study, a self-powered photoelectrocatalytic (PEC) device was designed using multi-walled carbon nanotubes (CNTs) and methylamine (CH 3 NH 2 ) modified perovskite solar cells (PSCs) as the power source and CNT/TiO 2 as the photoanodes . In the PSCs, CNTs and CH 3 NH 2 were used to modify the interface between the perovskite and carbon electrode to improve the photoelectronic performance. In particular, CH 3 NH 2 induced surface-healing of the CH 3 NH 3 PbI 3 perovskite thin films and the CNTs acted as a charge transport pathway among individual perovskite nanoparticles to facilitate the collection of photogenerated holes by the carbon electrode. A power conversion efficiency of 10.39% was achieved after modification with the CNTs and CH 3 NH 2 . In the photoanodes, the CNT-modified TiO 2 electrode accelerated the electron–hole separation and transportation, thereby improving the degradation performance. After assembling the PSCs modified using CNT and CH 3 NH 2 with CNT/TiO 2 , the solar-driven PEC system exhibited a high PEC degradation rate with rhodamine B (RhB). The optimal degradation efficiency for RhB with the tandem device was close to 100% after 80 min. This low-cost tandem assembly has promising applications in pollutant degradation research.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2019
·
IF 1.901
Hongwei Feng,Hui Xu,Hongtu Feng,Ying Gao,Xinyuan Jin
The sol-gel method was used to synthesize Gd-SiO 2 -TiO 2 composite photocatalysts. When the doping amounts of Si and Gd reached 9.1 mol% and 0.2 mol% respectively, the sample showed the optimal photocatalytic activity during the methylene blue (MB) degradation. When the calcination temperature was lower than 550 °C, Gd-SiO 2 -TiO 2 photocatalyst has an anatase crystal structure. After doping of Si and Gd, the absorption wavelength thresholds of the sample approached 407 nm with the energy gap of 3.05 eV. Gd-SiO 2 -TiO 2 photocatalyst showed the degradation efficiency about 90% to methylene blue (MB) under irradiation of simulated sunlight.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Christine N. Matindi,Sania Kadanyo,Gansheng Liu,Mengyang Hu,Yunxia Hu,Zhenyu Cui,Xiaohua Ma,Feng Yan,Benqiao He,Jianxin Li
Polyethersulphone/sulfonated polysulfone/TiO 2 (PES/SPSf/TiO 2 ) ultrafiltration (UF) mixed matrix membranes (MMMs) were coated with a hybrid layer composed of branched polyethyleneimine (PEI) and TiO 2 nanoparticles (NPs) crosslinked by glutaraldehyde (GA) to enhance its stability. The effect of TiO 2 NPs loadings on the thickness, surface wettability , surface charge and molecular weight cut-off (MWCO) was explored. The corresponding MWCO decreased from 96 kDa for the pristine PES/SPSf/TiO 2 MMM (M0) to 8.5 kDa for PEI-GA@MMMs (M1), and then gradually increased to the range of 15 kDa–40 kDa for PEI-TiO 2 /GA@MMMs. TiO 2 NPs having abundant –OH groups also increased electronegativity and hydrophilicity of the composite membranes. At neutral pH, the zeta potential changed from negative charge of MMMs (−33 mV) into positive charge of M1 (1.3 mV), then into negative charge (−7.4 mV) in the optimum hybrid coated membrane PEI-TiO 2 (0.025 wt%)/GA@MMMs (M3). The underwater oil contact angle (UWOCA) of with hexane , gasoline, dichloromethane and petroleum ether was 165°, 167°, 164° and 135°, respectively. The air/water contact angle (WCA) of M3 was 42°, which is lower than that of M1 (63°). It is important to note that M3 demonstrated a high rejection of different oil-in-water emulsions with <300 nm oil droplets (>90 %) and an improved pure water permeance of 62 LMH bar −1 compared to 44 LMH bar −1 of M1. M3 also exhibited double the antifouling rates of M1 hence corroborating wettability and surface charge results. In summary, our current study provides an available tuning approach to engineering membranes for the treatment of oil-in-water emulsions containing nano-sized oil droplets.
研究领域:
材料科学
·
环境工程
·
膜技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）