Journal of Nanomaterials
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2018
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IF 2.207
Ping Niu,Dunqing Wang,Aili Wang,Yuhua Liang,Xinfang Wang
Bifunctional films of Keggin-type polyoxometalates H3PW12O40 (PW12), H4SiW12O40 (SiW12), H3PMo12O40 (PMo12), and TiO2 were successfully built on Fe3O4@SiO2 microspheres using a layer-by-layer method. The characterization by field emission scan electronic microscopy (FESEM) and energy dispersive X-ray spectroscopy (EDX) shows that TiO2 nanoparticles and polyoxometalate (POM) anions are successfully assembled. The photodegradation of methyl orange (MO) was used to test the photocatalytic efficiency of magnetic catalysts under UV irradiation. For MO decomposition, multilayer films that combine PW12 and SiW12 with TiO2 show high efficiency, which can be attributed to the synergistic effect between POMs and TiO2. The degradation of the model contaminant was also systematically checked under different conditions such as bilayer number deposited on magnetic microspheres, catalyst concentration, inorganic oxidants, and salts. The oxidation process of MO follows an apparent first-order reaction. Furthermore, the composite catalysts deposited on Fe3O4@SiO2 magnetic microspheres can be conveniently, quickly, and efficiently separated by an external magnet from a solution.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2019
·
IF 5.155
Peng Lv,Chongyang Zhao,Woo Jae Lee,Siping Huo,Se-Hun Kwon,Jun Fang,Yang Yang
Zero-dimensional/two-dimensional (0D/2D) TiO 2 /g-C 3 N 4 heterostructural photocatalysts were fabricated via ALD technique. TiO 2 nanoparticles were “site-selectively grown” on g-C 3 N 4 nanosheets and the surface modification induced band engineering of the composite photocatalysts. Thus, the redox properties of the photocatalysts were fine tuned. Under visible light , since only g-C 3 N 4 was excited, TiO 2 was acting as the electron transport channel in the optimized interfacial structures . They effectively suppressed the recombination and facilitated the transfer of photogenerated charges, improving the photocatalytic activity. When both the components were excited under UV–vis light, the dynamic equilibrium of the conduction band positions on these n–n type semiconductor heterojunctions led to the increased recombination rate of charges, decreasing the reactivity for H 2 evolution. However, the photocatalytic degradation of organic pollutants by these composite photocatalysts exhibited enhanced activities, resulting from the photogenerated holes on VB of TiO 2 which could promote oxidation of organic pollutants with strong oxidation potentials. Furthermore, TiO 2 /g-C 3 N 4 photocatalysts with limited numbers of deposition cycles exhibited optimal photocatalytic activity under visible light. In contrast, excessive deposition cycles on g-C 3 N 4 for TiO 2 /g-C 3 N 4 led to continuous film and increased thickness of TiO 2 , resulting in the attenuation of the reactivity. We verified this TiO 2 /g-C 3 N 4 photocatalysts with less mass-loading, but more enhanced photocatalytic activity.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Zhihang Long,Xin Tong,Cheng Liu,Ali Imran Channa,Rui Wang,Xin Li,Feng Lin,Alberto Vomiero,Zhiming M. Wang
Colloidal semiconductor quantum dots (QDs) are promising building-blocks for the manufacture of cost-effective photoelectrochemical (PEC) cells towards efficient solar-to-hydrogen conversion. Nevertheless, the state-of-the-art QDs-based PEC systems still suffer from the frequent utilization of highly toxic elements in QDs (Cd and Pb), hindering their future practical applications and potential commercialization. Here, we report a PEC device fabricated using eco-friendly, near-infrared (NIR) ZnAgInSe (ZAISe) QDs and hybrid TiO 2 /graphene oxide (GO) film. Based on the synergistic effect of QD’s broad light absorption and excellent charge extraction/transport properties of TiO 2 /GO film, as-assembled QDs-photoanode exhibits an outstanding saturated photocurrent density of ~6.7 mA/cm 2 with good stability under standard 1 sun illumination. The introduction of functional GO can lead to the reduced charge transfer resistance, suppressed charge recombination, and enhanced electron transport within the QDs-TiO 2 photoanodes. The results offer a facile and effective method to enhance the performance of environmentally friendly QDs-based PEC devices and shed light on the development of low-cost, “green” and high-efficiency solar-to-hydrogen conversion system.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2023
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IF 6.6
Yuhua Dong,Xueyan Du,Yutong Xie,Kexin Wu,Qiong Zhou
A quaternary composite of Ti 3 C 2 /TiO 2 /TiN/polyaniline was synthesized by doping TiN nanoparticles on the calcined Ti 3 C 2 MXene nanosheets , and then polyaniline was deposited through chemical oxidation . The bandgap and flat band potential of composite were determined by X-ray diffraction and ultraviolet–visible spectroscopy. In order to prepare photoanode and photocathodic protective coating, the quaternary composite was added to the polyvinyl alcohol solution and epoxy resin to. Photoelectrochemical results indicated that photoanode and relevant photocathodic protective coating had similar photocurrent with about 5 μA cm −2 , but open circuit potential of the photocathodic protective coating was more negative than that of photoanode. The R ct of photoanode with illumination was 5.5 kΩ, while that of photocathodic coating was 136 kΩ. The 304 stainless steel could be well protected by the photoanode and photocathodic protective coating whether illumination or not, due to synergistic effect of local surface plasmonic resonance of TiN, “electron pool” of polyaniline and non-interfacial contact of TiO 2 and MXene. Moreover, the epoxy resin in the photocathodic coating could act as a kind of physical barrier in the dark environment. Additionally, results of long-term protection test indicated that the photocathodic protective coating under intermittent illumination had better protection property than that of the coating without illumination.
研究领域:
材料科学
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电化学
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防腐蚀工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Han Zhang,Sijia Sun,Hao Ding,Ying Chen
Using amorphous SiO 2 (A-SiO 2 ) and tetrabutyl titanate (TBOT) as raw material, a composite photocatalyst with surface loaded quantum dot size TiO 2 (A-SiO 2 /TiO 2 , AST) was prepared. The degradation of tetracycline hydrochloride as well as mechanism of performance improvement by A-SiO 2 were investigated. The TiO 2 on the composite was anatase with a content of 9.96 wt% and a size of 7–8 nm (quantum dot level). TiO 2 was uniformly distributed and was closely bonded at the interface by chemical bonds. The degradation rate of AST was 95% after 60 min UV exposure, which was comparable to pure nano-TiO 2 . The particle size of TiO 2 in AST was reduced from 20–50 nm to 7–8 nm comparing with pure nano-TiO 2 and changed from a highly agglomerated to a well-dispersed state due to abundant hydroxyl groups on A-SiO 2 surface. TiO 2 bandgap width increased from 3.25 eV to 3.39 eV. These led to the exposing of active sites on TiO 2 and significantly increased photogenerated carrier separation efficiency. This study provides a feasible and simple method to improve TiO 2 nanoparticles’ photocatalytic activity, reduce the usage and achieve recycling to cut the application cost by surface coated.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Nianbing Zhong,Ming Chen,Haixing Chang,Tianheng Zhang,Zhengkun Wang,Xin Xin
We present a high-selectivity photochemical fiber-optic sensor in which a plastic optical fiber (POF), TiO 2 -based composite, and polymer membrane are coupled for detection of phenol concentrations in water. A thinned POF is coated with TiO 2 -based composite, which is composed of Er 3+ :YAlO 3 /SiO 2 /TiO 2 (EYST) and acts as the sensing region. The EYST coating shows good light-inducing capacity at the core–coating interface and high photocatalytic activity in the visible light region. The polymer membrane is synthesized using PEBA2533 doped with β-cyclodextrin and shows high phenol selectivity and permeability; thus, phenol molecules can freely permeate the membrane and are then transferred, become attached to the surface of TiO 2 nanoparticles, and are photocatalytically degraded. Photocatalytic degradation of phenol improves the refractive index (RI) and absorbance of the solution because of the photocatalytic byproducts; consequently, the transmitted output light intensity of the sensor changes, and the phenol concentration is accurately detected by measuring the change in the light intensity. Experimental results indicate that the prepared device detects phenol in water with high selectivity and pH independence; in phenol detection, the novel sensor shows a sensitivity of −0.195 × 10 −3 (mg/L) −1 and a low limit of detection of 40 μg/L.
研究领域:
环境科学
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分析化学
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材料科学
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光学
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产品关联
DOI
高影响因子
International Journal of Nanomedicine
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2023
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IF 8
Wenshu Cheng,Xinyue Xu,Yuanyuan Lang,Zugen Cheng,Mohammad Rizwan,Xiaomin Tang,Lixin Xie,Yanling Liu,Hengyi Xu,Yang Liu
Purpose To evaluate the effects of anatase and rutile TiO2 nanoparticles (NPs) on the growth and development of bones in young rats and explore their possible mechanisms.Methods Three-week-old male rats were orally administered anatase TiO2 NPs and rutile TiO2 NPs for 28 days. The indicators of rat growth and development, liver function, bone metabolism, and insulin-like growth factor-1 (IGF-1) levels were evaluated. Micro-computed tomography (micro-CT) and immunohistochemistry were used to evaluate the tibia.Results No significant differences were observed among growth and development indicators in young rats. Significant differences were found in IGF-1 levels, phosphorus levels, and liver function. Micro-CT revealed osteoporosis in the bones. The micro-CT data supported the same result. Bone immunohistochemistry results showed that the expression of osteoprotegerin (OPG) was decreased and the expression of receptor activator of nuclear factor-κB ligand (RANKL) and cathepsin K (CTSK) was increased.Conclusion This study demonstrated that TiO2 NPs can damage bones via the IGF-1/OPG/RANKL/CTSK pathway in young rats. Furthermore, rutile TiO2 NPs damaged the bones more seriously than anatase TiO2 NPs.
研究领域:
纳米技术
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生物材料
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骨骼生物学
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毒理学
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产品关联
DOI
PubMed
高影响因子
SURFACE ENGINEERING
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2020
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IF 2.433
Zhen He,Di Cao,Fangcheng Cao,Shengping Zhang,Yuxin Wang
The effects of heat treatment on the properties of electrodeposited Co–P–TiO2 nanocomposite coatings were systematically investigated. The TiO2 nanoparticles-reinforced Co–P–TiO2 nanocomposites were heat-treated at different temperatures. Thermal analysis was conducted to characterize the structural transitions. The phase constituents and surface morphology of nanocomposites were identified. The mechanical properties including microhardness and wear tests were examined, and the electrochemical behaviour of Co–P–TiO2 was determined. At the increasing heating temperature, the structure of Co–P–TiO2 was gradually changed from amorphous into crystalline, with its surface morphology being smoother. Proper heat treatment can significantly improve the mechanical properties and corrosion resistance of coatings. When Co–P–TiO2 coating was heat-treated at 350°C, a smooth and flat surface morphology was obtained and optimal physicochemical performance among the examined coatings was achieved.
研究领域:
材料科学
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电化学
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DOI
高影响因子
CRYSTENGCOMM
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2013
·Vol. 16
·期 9
·1681-1686
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IF 3.879
Chao Chen,Jia Wang,Zhimin Ren,Guodong Qian,Zhiyu Wang
Oriented attachment, as aggregation based crystallization, is one of the most promising approaches in designing novel nanostructures. A two-step solvothermal method is reported in this work to synthesize TiO2 nanochains with one-dimensional single-crystalline nature, which is formed by oriented attachment and with tunable length. We achieved selectively reducing the stereo-hindrance effect at (001) surfaces and making the processes of Ostwald ripening and oriented attachment asynchronous. By virtue of the 1D single crystalline nature, the conversion efficiency of dye-sensitized solar cell was improved. This approach opens the door for controllable oriented attachment, and it is meaningful for designing novel nanoarchitectures.
研究领域:
材料科学
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纳米技术
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能源科学
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
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2023
·Vol. 17
·期 12
·1925-1936
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IF 4.5
Ma Jianzhong,Wen Lu,Fan Qianqian,Wei Siying,Hu Xueyun,Yang Fan
In recent years, limited photocatalysis efficiency and wide band gap have hindered the application of TiO 2 in the field of photocatalysis. A leading star in photocatalysis has been revealed as lead-free Cs 2 AgBiBr 6 double halide perovskite nanocrystals, owing to its strong visible light absorption and tunable band gap. In this work, this photocatalytic process was facilitated by a unique TiO 2 /Cs 2 AgBiBr 6 composite, which was identified as an S-cheme heterojunction. TiO 2 /Cs 2 AgBiBr 6 composite was investigated for its structure and photocatalytic behavior. The results showed that when the perovskite dosage is 40%, the photocatalytic rate of TiO 2 could be boosted to 0.1369 min −1 . This paper discusses and proposes the band gap matching, carrier separation, and photocatalytic mechanism of TiO 2 /Cs 2 AgBiBr 6 composites, which will facilitate the generation of new ideas for improving TiO 2 ’s photocatalytic performance.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
Coatings
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2021
·Vol. 11
·期 10
·1178
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IF 2.881
Min Zhang,Zhenjiang Li,Yunfei Zhao,Zhaofeng Wu,Jun Zhang,Linyu Yang,Shuying Wang,Shiqing Li
In this study, ultraviolet detectors based on NaTaO3/TiO2were fabricated with enhanced detection performance towards solar-blind (200–280 nm) light. A TiO2seed layer was introduced and served as a buffer layer between the fluorine tin oxide (FTO)-coated glass substrate and the TiO2film, which increased the adhesion between them. The periodic stability and photoelectric characteristics of the detectors were studied and analyzed. The detectors showed a high performance when illuminated by 265 nm and 254 nm UV light. At −15 V bias, the dark current of the detector was only 70 pA. Under the bias of −15 V and the illumination of 254 nm, the maximum photo-to-dark current ratio reached 20, and the response time was less than 300 ms. Moreover, the detector exhibited a fast response time and remained very stable after numerous testing cycles. These results demonstrate the potential application of NaTaO3/TiO2composites in UV detection.
研究领域:
材料科学
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光电子学
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2021
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IF 4.527
Yanhong Li,Qifeng Zhang,Yi Lu,Zhiting Song,Changjiang Wang,Dongshuo Li,Xiao Tang,Xianju Zhou
The photocatalytic degradation of tetracycline in aqueous solution is a typical heterogeneous reaction, and thus the design of efficient photocatalysts for tetracycline degradation should revolve the process features of heterogeneous reaction closely. In the present work, TiO 2 -P/ g -C 3 N 4 composites with abundant surface hydroxyls were prepared by coupled g -C 3 N 4 nanosheets with plasma treated TiO 2 (TiO 2 -P) nanoparticles . The resultant TiO 2 -P/ g -C 3 N 4 as photocatalysts showed higher activity for the degradation of tetracycline in aqueous solution than g -C 3 N 4 , TiO 2 , TiO 2 -P and TiO 2 / g -C 3 N 4 under visible light irradiation. The better activity of TiO 2 -P/ g -C 3 N 4 photocatalysts for tetracycline degradation could be ascribed to the good synergy between TiO 2 -P and g -C 3 N 4 . Specifically, due to the presence of surface hydroxyls on TiO 2 -P, the tetracycline adsorption activity, electrons-holes separation property as well as H 2 O 2 activating activity of TiO 2 -P/ g -C 3 N 4 during tetracycline degradation were improved. By integrating the property of g-C 3 N 4 photocatalyst in H 2 O 2 production, as well as the property of TiO 2 -P in activating H 2 O 2 into •OH and •O 2 - , efficient photo-Fenton degradation of tetracycline was achieved in the TiO 2 -P/ g -C 3 N 4 photocatalytic system. Our study on TiO 2 / g -C 3 N 4 composite photocatalyst provides helpful inspiration to design photocatalysts with high-activity for the photo-Fenton degradation of organic pollutants .
研究领域:
环境催化
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材料化学
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环境污染治理
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光化学
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纳米材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）