CRYSTENGCOMM
·
2014
·Vol. 17
·期 5
·1086-1091
·
IF 3.858
Fanpeng Cai,Yubin Tang,Hao Shen,Chao Wang,Ao Ren,Lisong Xiao,Wei Gu,Weidong Shi
Novel mix-phase TiO2 nanosheets were successfully synthesized by a facile sol–gel method using graphene oxide (GO) as the sacrifice template for the first time. The SEM, TEM and AFM images revealed that the thickness of mix-phase TiO2 nanosheets was ca. 66 nm, and the TiO2 nanosheets were in a polycrystalline phase and made up of nanoparticles with the diameters of 15–25 nm. In addition, we observed that the proportion of rutile and anatase changed with the amount of tetrabutyltitanate (TBT). The results showed that the sample with 4 mL tetrabutyltitanate (TBT-4) exhibited the highest hydrogen production rate (339 μmol h−1) in all samples, which was 47% higher compared to the bulk sample. It was attributed mainly to the surface phase junction of anatase and rutile and the special morphology of the samples.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Shengxin Cao,Xiaozhou Ye,Huiru Hu,Haoran Jin,Yun Wang,Jianfeng Ye
Mesoporous anatase TiO 2 sphere based materials has long been the focus of intensive research dealing with environmental-related issues due to their significant advantages in terms of structural isotropy, high surface area, structural stability, and low cost. However, in most cases, the employed mesoporous anatase spheres were comprised of nanocrystalline subunits with random crystalline orientations, which means that numerous grain boundaries exist in the sphere-shaped particles, suppressing their performance in various applications. Herein, by using mesocrystalline anatase submicrospheres that were synthesized via utilizing SO 4 2- ions to modulate the growth dynamics of anatase crystals in the green mixed solvents of PEG-400 and H 2 O as both template and reactant, novel sphere-shaped anatase mesocrystal/SrTiO 3 nanodot heterostructures were successfully produced. These spherical anatase mesocrystal/SrTiO 3 heterostructures exhibited noticeably enhanced activity toward reduction of hexavalent chromium (Cr VI ) under stimulated solar light irradiation, which was largely attributed to their favored adsorption of Cr VI , bolstered photogenerated charge carrier separation and well-preserved reduction capability due to the construction of a well-defined type-II heterojunction with tight interfacial contacts and strong interactions. This work will be useful for the designed fabrication of micro/nanostructured TiO 2 based photocatalysts with complex spherical morphologies for photocatalytic applications in environmental purification.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Haixin Zhao,Shu Cui,Lan Yang,Guodong Li,Nan Li,Xiaotian Li
Photocatalysts with a hierarchically porous structure have attracted considerable attention owing to their wide pore size distribution and high surface area , which enhance the efficiency of transporting species to active sites. In this study, hierarchically meso-macroporous TiO 2 photocatalysts decorated with highly dispersed CdS nanoparticles were synthesized via hydrolysis, followed by a hydrothermal treatment . The textural mesopores and interconnected pore framework provided more accessible active sites and efficient mass transport for the photocatalytic process. The light collection efficiency was enhanced because of multiple scattering of incident light in the macropores. Moreover, the formation of a heterojunction between the CdS and TiO 2 nanoparticles extended the photoresponse of TiO 2 to the visible-light range and enhanced the charge separation efficiency. Therefore, the hierarchically meso-macroporous TiO 2 /CdS photocatalysts exhibited excellent photocatalytic activity for the degradation of rhodaming B under visible-light irradiation. Trapping experiments demonstrated that superoxide radicals ( O 2 − ) and hydroxyl radicals ( OH) were the main active species in photocatalysis . A reasonable photocatalytic mechanism of TiO 2 /CdS heterojunction photocatalysts was also presented.
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Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Caili Hou,Tifeng Jiao,Ruirui Xing,Yan Chen,Jingxin Zhou,Lexin Zhang
New poly(vinyl alcohol)/poly(acrylic acid)/carboxyl-functionalized graphene oxide nanocomposite membranes were prepared using electrospinning technique with thermal treatment and modified with TiO 2 nanoparticles. The thus prepared composite membranes are composed of polymeric nanofibers with carboxyl-functionalized graphene oxide sheets, which are anchored on the fibers by heat-induced crosslinking reaction. The preparation process of the designed nanocomposites is facile, eco-friendly, and controllable. The TiO 2 nanoparticles were deposited uniformly and homogeneously onto the surface of the obtained composite membranes. The as-prepared composite membranes demonstrate efficient photocatalytic capacity toward dye degradation, which is primarily due to the specific surface area of electrospun membranes and the photoactivity of TiO 2 nanoparticles. In addition, the composite membranes reported here are easy to regenerate. In comparison with other composite catalysts, the present preparation process is highly eco-friendly and facile to operate and regulate, which demonstrates potential large-scale applications in wastewater treatment and dye removal.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 7
·071513
·
IF 4.316
Xiayu Lu,Li Liu,Yu Cui,Fuhui Wang
TiO2 p-n heterojunctions modified with zeolitic imidazolate framework-67 (ZIF-67), a metal-organic framework, were successfully fabricated by a solution self-assembly method, and their photoelectrochemical and photocathodic performance was investigated. The presence of the organic ligands in ZIF-67 enabled ZIF-67-TiO2 photoanodes to exhibit excellent stable cathodic protection performance under simulated sunlight illumination compared with traditional organic or inorganic cocatalysts. ZIF-67-TiO2 photoanodes could provide 12 h of effective and stable photocathodic protection for 304 stainless steel (304SS) in 3.5 wt% NaCl solution. Experimental results revealed that the morphology of ZIF-67 cocatalysts affected the photoelectrochemical performance of ZIF-67-TiO2 photoanodes. Compared with large (∼900 nm) ZIF-67-modified TiO2, small (∼115 nm) ZIF-67-modified TiO2 demonstrated an upwardly shifted conduction band (CB) and faster separation and migration of photogenerated carriers. Furthermore, a photoanode made from small ZIF-67-modified TiO2 exhibited a lower photogenerated potential (−0.37 V) than the photoanodes made from large ZIF-67-modified TiO2 and TiO2, this photoanode could provide more effective photocathodic protection for 304SS.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Chan Zheng,Jian Lin,Xiaoyi Song,Qingbao Gan,Xiaoying Lin
High emissions of hazardous pollutants into the environment potentially lead to water shortages. New cost-effective water-treatment techniques with high degradation efficiencies are therefore needed. Here, we design an “open-mouth,” hollow, TiO2-nanoparticle-shelled (OMHTNPS), light-induced-bubble-propelled microcleaner for efficiently degrading organic pollutants. OMHTNPS microcleaners with asymmetric structures can be obtained via a facile sol–gel method, with subsequent removal of carbon microspheres by a simple sintering process. The shells of the prepared OMHTNPS microcleaners mainly consist of 20 nm anatase–TiO2 nanoparticles. When exposed to UV light, the OMHNPS microcleaners moved rapidly because of the photocatalytic decomposition of H2O2. The propulsion mechanism was investigated in detail. The OMHNPS microcleaner velocity can be conveniently controlled by the UV irradiation intensity and H2O2 concentration. Light-triggered on/off motion of the prepared microcleaners was also demonstrated. The combination of photocatalysis, self-propulsion, and a specific hollow nanoparticle-shelled structure gave a rhodamine B removal rate of 98% in the first 10 min. This is approximately 11 and 3 times higher than those achieved with a static pattern and solid TiO2 microcleaners, respectively. Deposition of magnetic Fe3O4 particles enabled convenient recycling and reuse of the microcleaners. These novel OMHTNPS microcleaners show outstanding capabilities for the removal of organic pollutants with fast speed and confirm that high efficiency can be achieved through the structure design of the microcleaner. The strategy proposed here provides potential approaches to the large-scale fabrication of asymmetric micromotors and the design of versatile photocatalytic micromotors.
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Weicheng Cui,Hongye Bai,Jianpeng Shang,Fagen Wang,Dongbo Xu,Jinrui Ding,Weiqiang Fan,Weidong Shi
Constructing the high-performance photoanode is critical to improve photoelectrochemical (PEC) efficiency, but it is still an inevitable challenge to rationally fabricate the organic-inorganic hybrid-photoanode system. For the first time, we report a novel hybrid-photoanode built from ultrathin NiFe-MOF and TiO 2 by a sacrifice template method. The in-situ etch of NiFe-layered double hydroxide (LDH) on the surface of TiO 2 has been successfully realized in the coordination environment, for creating coordinately unsaturated metal sites on NiFe-MOF. The coordinately unsaturated metal sites could significantly promote the water oxidation kinetic , compared with conventional electrode/electrolyte interface. The photocurrent density of the NiFe-MOF/TiO 2 has reached about 3.35 times of bare TiO 2 at 1.23 V (vs. RHE), and the incident photon to current conversion efficiency (IPCE) value has been improved up to 42% (at 390 nm). The significant augment of the charge injection ( η injection ) of 92.8% and charge separation ( η separation ) efficiency of 37.4% has also been exhibited. Moreover, NiFe-MOF/TiO 2 shows a long-term stability ( < 10% decay) after 4 h of continuous illumination. This work provided a novel and rational strategy about the integration of the inorganic semiconductor and organic MOF , which can provide a new insight into understanding MOF-based catalysts for PEC water splitting.
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Jinlei Xie,Yefeng Yang,Haiping He,Ding Cheng,Minmin Mao,Qinxu Jiang,Lixin Song,Jie Xiong
Heterostructured semiconductor nanostructures have provoked great interest in the areas of energy, environment and catalysis. Herein, we report a novel hierarchical Ag 3 PO 4 /TiO 2 heterostructure consisting of nearly spherical Ag 3 PO 4 particles firmly coupled on the surface of TiO 2 nanofibers (NFs). The construction of Ag 3 PO 4 /TiO 2 heterostructure with tailored morphologies, compositions and optical properties was simply achieved via a facile and green synthetic strategy involving the electrospinning and solution-based processes. Owing to the synergetic effects of the components, the resulting hybrid heterostructures exhibited much improved visible light photocatalytic performance, which could degrade the RhB dye completely in 7.5 min. In addition, the coupling of Ag 3 PO 4 particles with UV-light-sensitive TiO 2 NFs enabled full utilization of solar energy and less consumption of noble metals, significantly appealing for their practical use in new energy sources and environmental issues. The developed synthetic strategy was considered to be applicable for the rational design and construction of other heterostructured catalysts.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2023
·
IF 3.6
Lianqing Yu,Yanxing Liu,Lijie Duan,Yaping Zhang,Liana Alvares Rodrigues,D. Amaranatha Reddy,Haifeng Zhu
Construction of heterojunctions has been shown to be one of the most promising methods for the preparation of highly efficient catalysts, because it is feasible and effective for the separation of electron-hole pairs, prolonging the lifetime of photogenerated electrons. In this study, TiO 2 was grown on fluorine-doped tin oxide glass (FTO), and then a strontium source was added to obtain heterojunctions between SrTiO 3 and TiO 2 using in-situ ion exchange hydrothermal method. The in-situ grown SrTiO 3 /TiO 2 (TST) composite has a better absorption performance, a narrower band gap, and a lower carrier recombination rate compared to the pure TiO 2 sample, which improves the photoelectrochemical performance. The photocurrent density of TST-10 (hydrothermally treated for 10 h) has the largest value of 0.06 mA·cm −2 , which is about three times higher than that of pure TiO 2 . Then, the first-principles density functional theory (DFT) calculation was used to further explore the photocatalytic mechanism of TST. The exchange correlation energy was based on the Generalised Gradient Approximation (GGA) with Perdew–Burke–Ernzerhof (PBE) functional calculation method to study the electronic and optical properties of SrTiO 3 /TiO 2 heterostructures. The results show that the carrier transfer rate and the optical absorption coefficient of the material increase significantly after the establishment of the in-situ heterojunction. This study offers insight into the heterostructures’ interface significance on photocatalytic activity.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Nan Zhou,Yufan Wu,Yiran Li,Jiankui Yang,Qing Zhou,Yuwei Guo,Mao Xia,Zhi Zhou
As an anode with ultrahigh capacity (4200 mAh g −1 ), silicon (Si) has inherent defects, such as drastic volume change (~300%) and poor conductivity. To cope with these problems, constructing a rigid shell (e.g. TiO 2 ) on the surface of Si particles is an effective method. Typically, monoclinic titanium dioxide (TiO 2 -B) has the more excellent electrochemical performance among the various crystalline of TiO 2 (anatase, rutile, etc.) for its open channel and characteristic pseudocapacitive effect. In addition, carbon nanotubes (CNTs) are good conductor of electricity. It is hopeful to increase the conductivity of the Si anode by adding CNTs . In this work, therefore, a Si@TiO 2 -B/CNTs composite is prepared by hydrothermal method. The composite exhibits superior electrochemical properties during the half-cell test (1184 mAh g −1 under 0.1 A g −1 at 200th cycles). Furthermore, the electrochemical kinetics of the materials were studied by cyclic voltammetry, which demonstrated that coating TiO 2 -B could increase the capacitive effects of the composite (68.75%).
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 2
·739-746
·
IF 3.591
Tao Wang,Xiqing Liu,Mei Liu,Runhua Liao,Hongquan Zhan,Xiaoxue Qi,Yongqing Wang,Yanju Huang
Black TiO2 and metal–organic frameworks (MOF) are great materials with light-harvesting ability, redox power and consequently catalytic activity. Here, the integration of MIL-100(Fe) with TiO2(B) composite was designed for photocatalytic application, which greatly promoted light-harvesting and charge transfer. As expected, the integrated TiO2(B)/MIL-100(Fe) composite showed high photocatalytic activity due to unique Fe–O–Ti bonds that were constructed, which acted as an electronic tunnel to reduce electronic transfer resistance between MIL-100(Fe) and TiO2(B). In addition, the presence of Fe–O clusters in MIL-100(Fe) can also promote the charge dissociation and improve catalytic activity via the Fe3+/Fe2+ redox cycle. This achievement would help us to understand and design charge transfer pathways in the integration of MOF/semiconductor photocatalysts.
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Energy Technology
·
2020
·Vol. 8
·期 7
·2000215
·
IF 3.404
Hao Liu,Zhengping Li,Haiyan Sun,Qifang Lu
Iron titanate is of considerable interest as a potential anode material for electrochemical energy storage and conversion. Herein, a fiber-like Fe 2 TiO 5 –TiO 2 @graphene (rGO–FTO–TO) hybrid structure is rationally designed and delicately fabricated by anchoring reduced graphene oxide (rGO) nanosheets on Fe 2 TiO 5 –TiO 2 (FTO–TO) nanofibers. The effective wrapping of rGO nanosheets can greatly improve the electrical conductivity and reduce the volume expansion. When evaluated as an anode, the rGO–FTO–TO exhibits remarkable lithium storage properties in terms of high capacity, long-term cycling stability, and excellent rate capability. Moreover, there exists a strong electrostatic interaction between rGO nanosheets and FTO–TO nanofibers by the introduction of aminopropyltriethoxysilane to induce the immobilization of a positively charged NH 3 + group on the FTO–TO surface, promoting the bonding with negatively charged carboxylic acid ( COO − ) and hydroxyl ( OH) groups on the rGO. With strong electrostatic interaction, the rGO–FTO–TO exhibits appreciably enhanced initial capacity, elevated capacity retention, and high columbic efficiency compared with those of pristine FTO–TO nanofibers. This work provides a feasible strategy for fabricating a graphene-encapsulated FTO–TO fiber-like composite as a promising high-performance anode for lithium-ion batteries.
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