Coatings
·
2022
·Vol. 12
·期 10
·1407
·
IF 3.236
Renhua Chen,Suying Ding,Bo Wang,Xuechang Ren
ZnFe2O4microspheres were prepared by solvothermal method, and a novel ZnFe2O4@TiO2core-shell composite photocatalyst was prepared by ultrasonic (denoted as ZT-x) and mechanical stirring (denoted as ZTM-1.2). The morphology, structure, magnetic, and optoelectronic properties of the catalyst were investigated comprehensively, and the degradation performance of the catalyst was explored through the photocatalytic degradation of Rhodamine B (RhB) under UV light. The concentration of RhB was 10 mg/L, and the catalyst concentration was 0.3 g/L. ZT-1.2 showed the best photocatalytic degradation activity, and the degradation rate of RhB reached 97.3% within 60 min. The degradation ability of the catalyst was further evaluated by Methylene blue (MB), Methyl orange (MO), Phenol, and Ofloxacin (OFX). ZT-1.2 also exhibited excellent stability. The improved catalyst degradation performance was attributed to constructing a Z-type heterojunction. Moreover, the low-efficiency degradation of ZTM-1.2 was caused by catalyst agglomeration and low TiO2loading, confirming the superiority of the ultrasonic method and providing a new method for the preparation of magnetically recoverable TiO2-based core-shell photocatalyst.Keywords:ZnFe2O4@TiO2;ultrasonic;nanocomposites;photocatalysis
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Ziwei Zhao,Qi Ling,Ziliang Li,Kui Yan,Chunsheng Ding,Peng Chen,Lei Yang,Zhaoqi Sun,Miao Zhang
The combination of light energy and mechanical energy is thought to be an effective way to manage environmental resources and create sustainable energy. In this study, thin-film catalysts compounded with photocatalytic material TiO 2 and piezoelectric material BaTiO 3 were successfully prepared by a simple hydrothermal method on glass sheets, avoiding the possibility of secondary contamination of powder catalysts. The synergistic effect of light and ultrasound enhanced the degradation of norfloxacin by heterojunction BaTiO 3 /TiO 2 . After 60 min, the norfloxacin degradation was 91.7 % complete, with a rate constant of 43 × 10 −3 min −1 . This rate constant was 2.69 times higher than the rate constant for TiO 2 at 16 × 10 −3 min −1 . The built-in electric field generated by ultrasound is thought to improve the catalytic and optoelectronic properties of the composite by separating photogenerated electrons and holes. In addition, the stability and general usability of the composites were investigated. The effects of norfloxacin concentration, solution pH, and anions on the experiments were also analyzed. Free radical trapping experiments were conducted on the composites to identify the active species. The results showed that h + and ·OH were the main active species. In addition, it was determined that S-Scheme heterojunctions were likely involved in the catalytic process.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2018
·
IF 3.525
Lili Ling,Longfei Liu,Yawei Feng,Jian Zhu,Zhenfeng Bian
TiO 2 mesocrystals can considerably enhance charge separation owing to their oriented superstructures, with fewer internal defects and porous properties providing more active sites. In this work, we prepared TiO 2 mesocrystal films by a direct annealing method. The morphology and crystal phase of the film were controlled by adjusting the ratio of NH 4 F and the calcination temperature. Moreover, we found that Au nanoparticles loaded on a TiO 2 mesocrystal film enabled highly efficient visible light photocatalytic properties. The photocatalytic activities were studied by hydrogen generation and photoreduction of Cr(VI). This work represents a considerable advance in the development and application of the TiO 2 mesocrystals.
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
ECS Journal of Solid State Science and Technology
·
2021
·Vol. 10
·期 5
·055018
·
IF 2.07
Mingxing Xiao,Rajesh Pathak,Dongping Zheng,Yuanyuan Jiang,Yingjie Zhang,Kaiwen Wei,Fan Wu
In this paper, two different nanostructures of CuO seeds layer and CuO nanocones array as photocathode were introduced for TiO2/Sb2S3 heterojunction to study the photoelectrochemical properties. The all-solid FTO/TiO2/Sb2S3/CuO seeds layer/FTO device and FTO/TiO2/Sb2S3/CuO nanocones array/FTO device could realize photoelectric conversion with a small photocurrent and photovoltage, and the photoelectrochemical properties of FTO/TiO2/Sb2S3/CuO nanocones array/FTO is even lower than that of the FTO/TiO2/Sb2S3/CuO seeds layer/FTO device due to the limited contact area between Sb2S3 and CuO nanocones. When the electrolyte I3−/I− was filled into space between Sb2S3 and CuO seeds (nanocones array) photocathode, the photoelectrochemical performance was significantly improved, especially, the photocurrent is enhanced by two (four) orders of magnitude and the photovoltage is enhanced by two orders of magnitude than the device for both photocathodes without electrolyte. For better understanding the photoelectrochemical mechanism of different CuO nanostructure photocathodes, dynamic characterization of intensity-modulated photocurrent/photovoltage spectroscopy and photoelectrochemical impedance spectroscopy were carried out to study photo-generated electron and hole behaviors. Results showed that charge transfer rate in device with CuO seeds layer photocathode is significantly enhanced by CuO nanocones array photocathode. The better hole transfer also improved the charge separation in Sb2S3 and reduced their recombination rate, which results in the enhanced photocurrent and photovoltage by CuO nanocones array photocathode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Peng Wang,Tong Song,Guanggang Gao,Katarzyna Matras-Postolek,Ping Yang
SnO 2 clusters were embedded in superior thin TiO 2 nanosheets to form heterostructures via a two-step solvothermal synthesis . Superior thin TiO 2 (B) nanosheets were firstly prepared, in which these nanosheets exhibited homogeneously sheet structure without aggregation. After deposition of SnO 2 clusters, the mixture phase consisted of anatase and TiO 2 (B) was obtained even though the nanosheet morphology remained unchanged. The ratio of SnO 2 and TiO 2 was adjusted to get enhanced gas sensing performance. The gas sensing activity of samples for volatile organic compounds including acetone, ethanol and triethylamine was tested. Results indicates that SnO 2 /TiO 2 heterostructure with an optimal SnO 2 weight ratio of 10% is remarkably responsive to acetone, ethanol and triethylamine . Especially, the response time to triethylamine is only 10 s. In the case of 2 ppm, the sample still revealed a significant response to triethylamine. The enhanced sensing performance has to ascribed to the significant increase of reactive active sites by loading SnO 2 clusters. In addition, ultra-thin morphology and mixed phase composition of TiO 2 also enhance the property of the composite. This work supplied an idea for the preparation of SnO 2 based gas sensors.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yi Hu,Yuqiang Guo,Fenghua Zhao,Rui Zuo,Xugang Lu,Shibing Xiong,Ping Huang,Bangcheng Yang
In the field of hard tissue repair, titanium-based materials have excellent mechanical properties and magnesium-based materials have good bioactivity, but their shortcomings are that titanium-based materials do not have good bioactivity, while magnesium-based materials are limited in application due to their rapid degradation rate. In order to give full play to the advantages of these two materials, the TiO 2 –MgO composite ceramic materials were prepared by combining the two elements and sintering at high temperature. By changing sintering temperature and MgO content, the structure composition and bioactivity of composite ceramic materials can be controlled. The surface morphology , mineralization ability in vitro, cytotoxicity and bone-promoting properties of composite ceramic materials were studied. The experimental results show that high MgO content composite ceramic materials will bring too strong alkalinity to the environment, which will accelerate the mineralization ability of materials, but is not conducive to the survival of cells. Composite ceramic materials with suitable sintering temperature and MgO content have good bioactivity and bone-promoting performance, while the porous structure produced by MgO degradation is beneficial to cell spreading and can form a good combination between the material and bone tissue at an early stage. Porous structure and Mg 2+ can adjust the bone-promoting properties of materials together. Through the above experimental research, it is found that TiO 2 –MgO composite ceramic material is a new type of material which is used in the field of hard tissue repair due to its good bioactivity.
研究领域:
生物材料学
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组织工程学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Zhengfeng Huang,Kaiming Xue,Yanzhao Zhang,Xudong Cheng,Peimei Dong,Xiwen Zhang
To integrate the CO 2 capture and photoreduction processes into a single system, MOFs-derived TiO 2 was loaded onto polyethersulfone (PES) or polyethylenimine (PEI)/PES electrospun mats using electrospray method. The mats incorporated with PEI has exhibited excellent CO 2 capture capacity and MOFs-derived TiO 2 doped with C (denoted as C/TiO 2 ) extended the absorption edge to >400 nm. The introduction of PEI that resulted in the C/TiO 2 -PEI/PES sample has significantly increased the CO 2 photoreduction yield by 81% when compared to C/TiO 2 -PES sample. The C/TiO 2 -PEI/PES sample could still capture and convert CO 2 into CO even in the low CO 2 atmosphere.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2018
·
IF 6.377
Lei Shi,Yurong He,Xinzhi Wang,Yanwei Hu
In recent years, nanoscale particles have been applied in the utilisation of solar energy due to their excellent properties. In light of the multiple functions of composite nanoparticles, some solar-assisted systems have been developed and exhibited comprehensive photoelectric and photo-thermal transformation effects. However, the presence of nanoparticles in these systems can cause secondary pollution and severely limit large-scale application of the solar technology. Herein we developed a recyclable photo-thermal conversion and purification system based on Fe 3 O 4 nanoparticles decorated with TiO 2 nanoparticles, which could be separated from water under the action of a magnetic force. Under the solar illumination power of 1 sun (1 sun = 1000 W·m −2 ), thermal receiver efficiency of 76.4% and Rhodamine B degradation efficiency of 85% were obtained with a 0.1 g/L Fe 3 O 4 @TiO 2 nanofluid. With the increase of the solar illumination power, the degradation efficiency has been increased to 94%. The recovery rate and efficiency could be controlled by adjusting the magnetic field strength and the magnetic property of Fe 3 O 4 @TiO 2 nanoparticles. This study provides an approach to not only significantly reduce material consumption in the design of solar devices, but also to realise broad solar energy applications for water purification and photo-thermal conversion.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 107
·期 1
·178-189
·
IF 2.606
Li Qing,Qian Fuping,Yuan Ke,Dong Wei,Han Yunlong,Lu Jinli
In order to solve the problem of blocking the filter media when bag filters are used to deal with high-humidity dust, hydrophobic surface-modified filter media were prepared. Here we constructed a multi-layer rough structure using TiO 2 and SiO 2 , with polydimethylsiloxane (PDMS) subsequently deposited to reduce its surface energy to prepare stable and robust TiO2–SiO2@PDMS modified superhydrophobic filter media. Through modification of the filter media, its surface was changed from superhydrophilic to superhydrophobic, and the water contact angle reached 158°. For the particles with 0.3 μm, the filtration efficiency and quality factor of the modified filter media are higher than those of the unmodified filter media at a flow velocity of 0.043–0.127 m/s, which improves the filtration performance of the filter media. In addition, the modified filter media has strong durability in harsh environmental conditions (such as mechanical wear, strong acid or alkali solution), and has excellent self-cleaning performance. Therefore, such superhydrophobic filter media have great potential for the application of bag filters in various industrial production processes.
Graphical abstract
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2023
·
IF 2.8
Chunzheng Wu,Ling Fang,Fangjie Ding,Genxiang Mao,Xiaogu Huang,Shun Lu
Ultra-small Pt nanoparticles loaded on TiO 2 through in-situ photo-deposition for H 2 production via photo reforming of wastepaper was prepared in this study. The effect of noble metal cocatalyst, Pt loading, content of paper (e.g., napkin), and concentration of NaOH was investigated. Consequently, a highest H 2 production rate of 614.7 µmol/g/h was achieved in the optimum condition. It was found that both the solid paper and the dissolved part in the NaOH solution could scavenge the photo-generated holes and contribute to H 2 production. Our research provides a potential route for the reuse of wastepaper to produce clean fuel.
研究领域:
环境科学
·
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2023
·
IF 5.6
Ao Jiang,Yuli Di,Shanhua Chen,Dafu Zhang,Xingyu Chen,Zhengdong Zhang,Xinyi Zhang,Qi Dong
The sol-gel method was used to prepare a series of muscovite/TiO 2 heterostructures for photocathodic protection of 304 stainless steels (304SS). The effects of different mass ratio of muscovite to TiO 2 (1:0.5, 1:1 and 1:1.5, denoted as MT-0.5, MT-1 and MT-1.5, respectively) on the crystal phase, grain size, light absorption properties and photoelectrochemical properties of TiO 2 and muscovite/TiO 2 heterostructures were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV–visible diffuse reflection spectroscopy (UV–vis DRS). The corrosion resistances and photoelectrochemical properties of the 304SS coated with muscovite/TiO 2 heterostructures (304SS/MT) were studied through corrosion immersion test and electrochemical workstation in 3.5 wt% NaCl solution, respectively. In addition, Tafel curves and the electrochemical impedance spectroscopy (EIS) measurements were carried out to evaluate the photogenerated electron separation and transfer efficiency, and the interfacial charge transfer resistance of the 304SS and 304SS/MT electrodes, respectively. The time-dependent photocurrent responses of the MT-1 heterostructures demonstrated an enhanced photo-generated cathodic protection performance for 304SS substrates under visible light irradiation compared to TiO 2 . A photoinduced potential drop value for 304SS coated with MT-1 in 3.5 wt% NaCl solution was −0.54 V (vs. SCE). After immersion test, the corrosion image analyses of the 304SS, 304SS-MT, and 304SS coated with physically mixed muscovite/TiO 2 samples showed that the 304SS/MT-1 exhibits the best corrosion resistances . After connecting with 304SS/MT-1 in 3.5 wt% NaCl solution, the corrosion current densities ( i corr ) of 304SS increased significantly under the white light illumination, indicating more photoinduced electrons were migrated from the muscovite/TiO 2 heterostructures to the 304SS compared with that from pure TiO 2 . Furthermore, the simulated charge transfer resistance ( R ct ) of 304SS/MT-1 electrode is smaller than that of the 304SS electrode coated with TiO 2 , indicating that there exists an effective separation of the photogenerated electrons and holes, and a fast interfacial charge transfer after coating muscovite/TiO 2 heterostructures.
研究领域:
材料科学
·
电化学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Yi-Yan Liao,Qiang Sun,Xu-Ping Jiang,Hao Wu,Bang-Zhou Tian,Ze-Gao Wang,Kun Zheng,Lei Yang
The coupling of charge carrier and phonon transport limits the application of Ag 2 Se as a low-toxic near-room-temperature thermoelectric material. Strategies that reduce the thermal conductivity via enhancing the phonon scattering usually lead to reduced carrier mobility due to high grain boundary potential barrier. In this study, we developed a cell-membrane-mimic grain boundary engineering strategy for decoupling the charge carrier and phonon scattering through decorating high-dielectric-constant rutile TiO 2 at Ag 2 Se grain boundaries to enable the charge carrier/phonon selective permeability. The nano-sized TiO 2 with high dielectric permittivity can secure the charge carrier transport by shielding the interfacial Coulomb potential to lower the energy barrier of grain boundaries, rendering an enhanced power factor. Additionally, benefited from the enhanced phonon scattering by TiO 2 nanoparticles, a significantly decreased lattice thermal conductivity of ∼0.20 W m −1 K −1 and a high zT of ∼0.97 at 390 K are obtained in the Ag 2 Se-based nanocomposites. This work demonstrates that such cell-membrane-mimic grain boundary engineering strategy may shed light on developing high-performance thermoelectric materials.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）