Catalysts
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2018
·Vol. 8
·期 5
·182
·
IF 3.465
Feng Li,Jinrong Liang,Wenxi Zhu,Hua Song,Keliang Wang,Cuiqin Li
Ni/TiO2catalysts with different morphologies (granular, sheet, tubular and spherical) were prepared. Hydrogen was generated from ethanol aqueous-phase reforming over Ni/TiO2in a water-ethanol-m-chloronitrobenzene reaction system and directly applied intom-chloronitrobenzene catalytic hydrogenation. Thereby, in-situ liquid-phase hydrogenation ofm-chloronitrobenzene over Ni/TiO2without addition of molecular hydrogen was successful. Compared with granular, sheet and spherical Ni/TiO2, the nanotubular Ni/TiO2prepared from one-step hydrothermal reaction had larger specific surface area, smaller and uniformly-distributed pore sizes and more Lewis acid sites. In-situ liquid-phase hydrogenation ofm-chloronitrobenzene experiments showed the nanotubular Ni/TiO2had the highest catalytic activity, which was ascribed to both catalyst morphology and acid sites. Firstly, the nanotubular structure endowed the catalysts with a nanoscale confinement effect and thereby high catalytic performance. Secondly, the Lewis acid sites not only accelerated water–gas shift reaction, enhancing the ethanol aqueous-phase reforming activity for hydrogen generation, but also promoted the adsorption and hydrogenation of –NO2on the active sites of the catalysts.Keywords:Ni/TiO2;morphology effect;in-situ hydrogenation;aqueous-phase reforming;m-chloronitrobenzene
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Frontiers of Environmental Science & Engineering
·
2018
·Vol. 12
·期 3
·1-10
·
IF 1.961
Wu Zhichao,Zhang Chang,Peng Kaiming,Wang Qiaoying,Wang Zhiwei
Membrane technology for oil/water separation has received increasing attention in recent years. In this study, the hydrophilic/underwater superoleophobic membrane with enhanced water permeability and antifouling ability were fabricated by synergistically assembling graphene oxide (GO) nanosheets and titanium dioxide (TiO 2 ) nanotubes for oil/water separation. GO/TiO 2 membrane exhibits hydrophilic and underwater superoleophobic properties with water contact angle of 62° and under water oil contact angle of 162.8°. GO/TiO 2 membrane shows greater water permeability with the water flux up to 531 L/ (m2$h$bar), which was more than 5 times that of the pristine GO membrane. Moreover, GO/TiO 2 membrane had excellent oil/water separation efficiency and anti-oil-fouling capability, as oil residual in filtrate after separation was below 5 mg/L and flux recovery ratios were over 80%.The results indicate that the intercalation of TiO 2 nanotubes into adjacent GO nanosheets enlarged the channel structure and modified surface topography of the obtained GO/TiO 2 membranes, which improved the hydrophilicity, permeability and anti-oil-fouling ability of the membranes, enlightening the great prospects of GO/TiO 2 membrane in oil-water treatment.
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FUEL PROCESSING TECHNOLOGY
·
2018
·
IF 3.956
Tian-qi Lei,Yan-hu Cheng,Chang-xi Miao,Wei-ming Hua,Ying-hong Yue,Zi Gao
Dehydrogenation of ethane to ethylene in the presence or absence of CO 2 over silica-doped TiO 2 supported Ga 2 O 3 catalysts was investigated. The silica doping of TiO 2 support greatly improved the dehydrogenation activity in the absence of CO 2 , which can be ascribed to the increased acid sites. The initial activity in the presence of CO 2 decreased after the silica doping, due to the reduction in reverse water-gas shift ability. However, the selectivity as well as the stability increased, resulting in higher steady ethylene yield. A dynamic process consisting of alternative oxidative dehydrogenation/regeneration cycles by gasifying the carbon deposit with air for 10 min after each cycle of 6 h reaction was also performed and relatively stable ethane conversion ~30% and ethylene yield ~25% can be achieved. The different catalytic behaviors are probably associated with the different state of gallium species, caused by the different interaction between the Ga 2 O 3 and support.
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Advanced Materials Interfaces
·
2018
·Vol. 5
·期 22
·1801015
·
IF 4.834
Yang-Fan Xu,Xu-Dong Wang,Jin-Feng Liao,Bai-Xue Chen,Hong-Yan Chen,Dai-Bin Kuang
Artificially photocatalytic reduction of CO 2 into valuable chemicals, responding to the call of carbon neutral economy, has aroused considerable interests so far. Among those photocatalysts screened, an emerging and promising alternative of inorganic CsPbBr 3 perovskite has recently been reported. Here, to attain preferable photocatalytic performance, an amorphous-TiO 2 -encapsulated CsPbBr 3 nanocrystal (CsPbBr 3 NC/a-TiO 2 ) hybrid is demonstrated through a solution processing strategy. After optimizing the a-TiO 2 matrix amount by tuning the tetrabutyl titanate precursor volume, the CsPbBr 3 NC/a-TiO 2 composite exhibits a marvelous 6.5-fold improvement on the consumption of photoelectrons in photocatalytic CO 2 reduction reaction when compared with the individual CsPbBr 3 NC. Such significant enhancement is ascribed to the accelerated electron–hole separation and the multiplied CO 2 adsorption. Thus, as an available prototype, this work offers a rational encapsulation design for efficient halide perovskite photocatalyst.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2018
·
IF 3.649
Yongteng Qian,Jimin Du,Dae Joon Kang
Highly porous nanostructures having large specific surface areas are very desirable for electrochemical supercapacitors to achieve a large energy storage capacity. We synthesized porous Co-doped TiO 2 nanostructures with an average diameter of 450 nm through a simple solvothermal method by using tetrabutyl titanate and cobalt acetate as precursors and polystyrene beads as templates. The optimized 7% Co-doped TiO 2 nanostructures-based supercapacitor electrodes exhibited a specific capacitance of 352 F g -1 at a current density of 0.5 A g −1 while retaining a capacity of 97.2% after 3000 cycles. This excellent electrochemical performance may be ascribed to the synergistic effects originating from conductivity enhancement of TiO 2 through optimized Co-doping and larger specific surface areas rendered by structural porosity, when compared to the undoped TiO 2 samples. Our results suggest that porous Co-doped TiO 2 nanostructures can be explored for potential electrochemical applications.
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CHEMICAL PHYSICS
·
2018
·
IF 1.707
Hang Zhang,Yan Zhang,Junwei Yin,Zhenzi Li,Qi Zhu,Zipeng Xing
In-situ N-doped mesoporous black TiO 2 photocatalyst is fabricated by a facile sol-gel method combined with an in-situ solid-state chemical reduction technique, using urea as nitrogen resource. The N-doped mesoporous black TiO 2 possesses high surface area of 96 m 2 g −1 , large pore size of 5.4 nm and narrow band gap of 2.05 eV. Meanwhile, the optical absorption extends to visible light region because of Ti 3+ and N co-doping. The N-doped mesoporous black TiO 2 exhibits higher photocatalytic activity than that of others under visible light irradiation for photocatalytic degradation of methyl orange (MO) and rhodamine B (RhB), which is up to 93.27% and 93.64%, respectively. The enhancement is ascribed to the synergistic effect of the N and Ti 3+ co-doping extending the visible light absorption, the separation efficiency of photogenerated charge carriers, and the mesoporous structure with large surface area offering more surface active sites, which is beneficial for improving the photocatalytic activity.
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Materials
·
2019
·Vol. 12
·期 17
·2813
·
IF 2.972
Haijuan Li,Ling Li,Shuaizhi Zheng,Xinming Wang,Zengsheng Ma
To improve the thermal shrinkage and ionic conductivity of the separator for lithium-ion batteries, adding carboxylic titanium dioxide nanofiber materials into the matrix is proposed as an effective strategy. In this regard, a poly(vinylidene fluoride-hexafluoro propylene)/dibutyl phthalate/carboxylic titanium dioxide (PVDF-HFP/DBP/C-TiO2) composite separator is prepared with the phase inversion method. When the content of TiO2nanofibers reaches 5%, the electrochemical performance of the battery and ion conductivity of the separator are optimal. The PVDF-HFP/DBP/C-TiO2(5%) composite separator shows about 55.5% of porosity and 277.9% of electrolyte uptake. The PVDF-HFP/DBP/C-TiO2(5%) composite separator has a superior ionic conductivity of 1.26 × 10−3S cm−1and lower interface impedance at room temperature, which brings about better cycle and rate performance. In addition, the cell assembled with a PVDF-HFP/DBP/C-TiO2separator can be charged or discharged normally and has an outstanding discharge capacity of about 150 mAh g−1at 110 °C. The battery assembled with the PVDF-HFP/DBP/C-TiO2composite separator exhibits excellent electrochemical performance under high and room temperature environments.Keywords:TiO2nanofiber;PVDF-HFP;composite separator;phase inversion;thermal shrinkage;ionic conductivity
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Hanyang Gao,Guoxin Hu,Juan Sui,Chao Mu,Wenfeng Shangguan,Min Kong,Wei Shentu
In this research, two interesting phenomena were reported and analyzed: First, two-dimensional tiny titania nanoplates (4–5 nm lateral size, 0.4–0.5 nm thickness) with rich edge-defects were found to self-assemble into free-standing thin sheets with large lateral size in a freeze-drying process with the aid of linker; Second, when subjected to a moderate hydrogenation treatment, these self-assembled sheets could be crystallized into integral anatase sheets while the edge-defects of the building blocks were maintained on the surface or inside the body of the crystal and the flexible sheet-like shape were also maintained. Based on these observations, a method for scalable preparing free-standing defect-rich TiO 2 with a two-dimensional sheet-like morphology was proposed. The defects (oxygen vacancies) endowed the TiO 2 a grayish-black color and visible-light responsibility. By using the dispersion of these defect-rich anatase sheets, a film could be densely deposited on flexible substrates in a layered structure and showed an efficient performance in acetaldehyde decomposition under the irradiation of visible light. Since it has always been a technical challenge to prepare crystallized visible-light-driven TiO 2 films on plastic substrates with a low heat tolerance, this work may also provide a new approach to this problem.
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Sustainable Energy & Fuels
·
2017
·Vol. 2
·期 3
·616-625
·
IF 0
Bin Xue,Tongtao Li,Biwei Wang,Li Ji,Dong Yang,Angang Dong
Rational design of nanostructured anode materials is of importance for promoting the performance of lithium ion batteries (LIBs). Here the Fe3O4 nanoparticles (NPs) were controllably inserted into the matrix of TiO2 nanorods (NRs) to obtain doped-superparticles (SPs) by a facile colloidal self-assembly route and subsequent calcination. To justify the effects of the doping, the lithium storage performances of the doped-SPs were evaluated as anode materials for LIBs. The results indicated that even a slight doping of Fe3O4 NPs can effectively enhance the properties of the anode materials compared with raw TiO2 NR SPs. Additionally, the Fe3O4/(TiO2)70 SPs showed an optimal performance in term of specific capacity, rate capacity, and cycling stability, whose reversible capacity maintained around 550 mA h g−1 at a current density of 1000 mA g−1 after 400 cycles. The highly enhanced lithium storage of the Fe3O4 NP doped-TiO2 NR SPs can substantially be attributed to the synergism of the doped-superstructure, in which the individual merits of the Fe3O4 NPs and TiO2 NRs are fully played out. This work not only demonstrates the significant effects of Fe3O4 NP doping for TiO2 NR SP anode materials in LIBs, but also opens an avenue for the self-assembly synthesis of doped-SPs with extended applications.
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THIN SOLID FILMS
·
2017
·
IF 1.879
Yi-Yi Liu,Yi-Lin Wang,Xin-Yu Ye,Xiao-Dong Qiao,Qiu-Ping Luo,Bing-Xin Lei,Wei Sun,Zhen-Fan Sun
The ultra-long hierarchical bud-like branched TiO 2 nanowire arrays on fluorine-doped tin oxide glass substrate have been prepared via a two-step solution route, which involves the growth of the anatase TiO 2 nanowires with the length of 48 μm on fluorine-doped tin oxide glass substrate, followed by a secondary growth of the rutile TiO 2 nanorods on the as-grown TiO 2 nanowires backbone. The dye-sensitized solar cell based on the hierarchical bud-like branched TiO 2 nanowire arrays shows a power conversion efficiency of 6.00%, which is nearly 2.88 times as high as that of bare TiO 2 nanowire arrays because of the preferable nanostructure , which not only retains the efficient charge separation and transport properties of one-dimensional TiO 2 nanostructures, but also improves the amount of dye adsorption and light-scattering ability due to the branched structure.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-8
·
IF 4.259
Zhang Hui,Li Yuqi,Lu Zexiang,Chen Lihui,Huang Liulian,Fan Mizi
Oil-water separation has recently become a worldwide concern because of the increasing oil spill accidents and industrial oily wastewater generation. Herein, a facile method with the combined superhydrophobic coating and adhesive was used to fabricate superhydrophobic TiO 2 NPs coated cellulose sponge. The developed materials exhibited excellent superhydrophobicity (WCA = 171°) and superoleophilicity (OCA = 0°), which can separate a variety of oil-water mixtures, including chloroform, toluene, kerosene and other contaminations. A high separation efficiency up to 98.5% for chloroform-water mixture was achieved when used for gravity-driven oil/water separation test. More importantly, the as-prepared samples exhibited excellent chemical stability and mechanical abrasion resistance even towards various corrosive oil/water mixtures (such as strong acid, alkali solution and salt-water environment) or a strong abrasion by aluminium oxide sandpaper of 600 mesh. In addition, the separation efficiency remained above 93% even after 40 scratch cycles, and the materials could be reused with a stable hydrophobicity, indicating a strong potential for industrial application.
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RSC Advances
·
2017
·Vol. 7
·期 83
·52755-52761
·
IF 3.108
Maolin Zhang,Tiedan Chen,Yunjian Wang
Despite the enormous efforts devoted to the research of titanium dioxide (TiO2), controlling TiO2 polymorphism, size and morphology still represents an interesting challenge since its stabilities, transitions and properties vary with them. Herein, we report a novel selective-synthesis of high purity anatase (A), rutile (R) and brookite (B) phase TiO2 from solution under mild hydrothermal conditions. By adjusting the concentrations of chloroacetic acid, urea and sodium hydroxide, A-TiO2 nanocrystals, R-TiO2 nanorods and B-TiO2 hollow spheres and nanorods can be easily produced as investigated by XRD and TEM characterisation. Based on time-varied experiments, two distinct phase transitions were observed under different hydrothermal conditions, namely the initially formed A-TiO2 nanocrystals would transform into R-TiO2 nanorods with augmented crystalline size under acidic conditions while they transformed into B-TiO2 hollow spheres under basic conditions. Moreover, polymorph formation and transition mechanism were explored in detail based on systematic investigation into the effects of synthetic parameters on the products. Finally, the spectra and photocatalytic properties of the three polymorphs were investigated and discussed. The synthetic approach reported here allows for full control over polymorph selection in TiO2 crystallization and provides new insights in this area.
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