JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 54
·期 1
·592-604
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IF 2.993
Chen Jin,Wang Enqi,Mu Jiechen,Ai Bing,Zhang Tiezhu,Ge Wenqing,Zhang Lipeng
CNTs–C@TiO 2 composite with 3D networks as electrode has been synthesized for lithium ion batteries (LIBs)/sodium ion batteries (SIBs) by a traditional solvothermal process. The composites were characterized by scanning electron microscopy, field emission electron microscopy, X-ray diffraction, Raman spectroscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy. The continuous 3D conductive networks, which consisted of acid-treated CNTs, provided numerous attachment sites for TiO 2 particles and carbon layers (similar to a shell) produced by the Ti 4+ -induced polymerization of ethylene glycol, thereby promoting electron and ion transfer. The composites contained 10.09 wt% CNTs (excellent conductor) and 12.75 wt% pyrolytic carbon. The Raman spectra confirmed the high degree of graphitization of the composites, and the improved conductivity resulted in outstanding electrochemical behavior. The electrochemical performance in the Li + /Na + storage of CNTs–C@TiO 2 composites was greatly enhanced, as revealed by this material’s outstanding capacity of 205 mA h g −1 at a current density of 0.1 A g −1 after 200 scanning cycles for LIBs and 148 mA h g −1 at 0.1 A g −1 over 100 cycles for SIBs.
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Royal Society Open Science
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2018
·Vol. 5
·期 8
·
IF 2.504
Haijin Liu,Peiyao Li,Haokun Bai,Cuiwei Du,Dandan Wei,Yuzhao Su,Yuqian Wang,Lin Yang
Anatase TiO2 with {001} facets is much more active than that with {101} facets, which has been verified via experiments and theoretical calculations. Graphene has garnered much attention since it was initially synthesized, due to its unique properties. In this study, reduced graphene oxide (RGO)/{001} faceted TiO2 composites were fabricated via a solvothermal method. The composites were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectrophotometry, photoluminescence and Raman analysis. The results revealed that the graphene oxide was reduced during the preparation process of the {001} faceted TiO2, and combined with the surface of {001} TiO2. The photocatalytic activities of the composites were evaluated through the degradation of basic violet, under both white light (λ > 390 nm) and visible light (λ = 420 nm) irradiation. The results indicated that the photocatalytic activities of the {001} faceted TiO2 were significantly improved following the incorporation of RGO, particularly under visible light irradiation. Theoretical calculations showed that the band structure of the {001} faceted TiO2 was modified via graphene hybridization, where the separation of photoinduced electron–hole pairs was promoted; thus, the photocatalytic activity was enhanced.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2018
·
IF 4.61
Xinyue Wang,Yingnan Sun,Lu Yang,Qingkun Shang,Dan Wang,Tongtong Guo,Yihang Guo
Photocatalysis is one of the effective strategies to eliminate various organic pollutants in water body. In this paper we have prepared a series of new composite photocatalysts to degrade phenol and norfloxacin under visible light irradiation. They were [Fe II (dpbpy) 2 (H 2 O) 2 ]/TiO 2 , [Fe II (dpbpy)(phen) 2 ]/TiO 2 and [Fe II (dpbpy)(bpy) 2 ]/TiO 2 (dpbpy: 2,2′-bipyridine-4,4′-diphosphoric acid, phen: 1,10-phenanthroline, bpy: 2,2-bipyridyl). The results show that their photocatalytic performance and cyclic stability are much better than that of pure TiO 2 or P25. Phenol can be degraded almost completely and the active groups or substituents of norfloxacin (NOR) can be destroyed also, which greatly reduced the biological toxicity of phenol and norfloxacin in water. The possible mechanisms of improving the photocatalytic activity and stability of TiO 2 by using Fe-complex are proposed based on free radical capture test and density functional theory calculation. It is clearly that the interfacial interaction between Fe-complex and titanium dioxide directly affects the photocatalytic activity and stability of the composite photocatalyst. The conjugated structure of the complexes plays a crucial role.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 45
·期 2
·757-768
·
IF 1.674
Li Qiang,Wang Lifang,Zhang Li,Xie Hongyong
In this study, rapid degradation of Tetrabromobisphenol A (TBBPA) is explored by using photocatalysis of homo/heterogeneous UV/TiO 2 /potassium persulfate (KPS) systems in alkaline solutions. The experimental results show increasing pH values and decreasing the initial concentration of TBBPA could increase the degradation degree, while the loading amount of TiO 2 and dosage of potassium persulfate have optimum values to increase the degradation degree. TBBPA can be almost completely degraded and 70% of TOC removal efficiency is achieved in the UV/TiO 2 /KPS homo/heterogeneous photocatalysis, much more than the UV/KPS system and UV/TiO 2 system. Roles of radicals \(\text{SO}_{\text{4}}^{ \cdot - }\) and OH · in the photocatalysis systems are discussed based on experimental measurements. The significant TOC removal efficiency and increased bromide ion concentration yield show that there exist synergistic effects in the UV/TiO 2 /KPS homo/heterogeneous photocatalysis, which can mineralize TBBPA into inorganic small molecules relatively thoroughly, thus much less intermediates are formed in the UV/TiO 2 /KPS homo/heterogeneous photocatalysis.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Xinlu Li,Yin Liu,Xinlin Zhang,Cong Yao,Ronghua Wang,Chaohe Xu,Juan Lei
A porous spherical hybrid of TiO 2 (B)/anatase entwined by graphene nanoribbons (GNRs) was synthesized by a facile and scalable method. The entwining of GNRs can adhere on the surface of TiO 2 by electrostatic interactions and prevent TiO 2 nanoribbons from self-scrolling to nanotubes , facilitating large lithium storage and high rate capability. The TiO 2 /GNRs nanocomposite exhibited high rate capability in galvanostatic charge-discharge experiments, providing a capacity of 131 mAh g −1 with a coulombic efficiency of 99.2% at a charge rate of 10C (1 C = 335 mA g −1 ) over 1400 cycles. The appealing electrochemical performance can be attributed to the synergistic effect of TiO 2 nanoribbons entwined by GNRs.
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SURFACE AND INTERFACE ANALYSIS
·
2018
·Vol. 51
·期 2
·169-176
·
IF 1.263
Xuebin Hou,Yibing Cai,Xiaofei Song,Yue Wu,Junhao Zhang,Qufu Wei
Controlled polydopamine (PDA)-coated TiO 2 composite nanofibers (NFs) were successfully fabricated via a facile electrospinning process and exposing TiO 2 NFs into a slightly alkaline dopamine solution. Chemical composition, structural morphology, and photocatalytic degradation property of as-prepared TiO 2 NFs and PDA-coated TiO 2 composite NFs were characterized by Fourier transfer infrared, X-ray photoelectron spectra, transmission electron microscopy, UV-vis diffuse reflectance spectra, and photocatalytic degradation experiments. The results indicated that the core-shell TiO 2 @PDA composite NFs were successfully prepared and the thickness of PDA shell was highly controlled within several nanometers. And obtained TiO 2 @PDA composite NFs exhibited improved photocatalytic performance after PDA coating, which is attributed to the photosensitization of PDA shell. Moreover, with increased pH values of initial solution, both absorption capacity in the dark and photocatalytic performance of TiO 2 @PDA composite NFs showed significant improvement. Additionally, the obtained composite NFs showed different degrees of enhancement in photocatalytic performance based on different dyes, which is related to the “bait” effect of PDA shell. Comparing with anionic dyes, TiO 2 @PDA composite NFs tended to adsorb and degrade more cationic dye molecules. It is anticipated that the fabricated composite NFs with controlled core-shell structure have great potential to be applied for organic pollutants removal, especially cationic dyes.
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Environmental Science-Nano
·
2018
·Vol. 5
·期 11
·2631-2640
·
IF 6.087
Yuting Cai,Jun Song,Xiaoyan Liu,Xia Yin,Xiaoran Li,Jianyong Yu,Bin Ding
TiO2-based heterojunction fibrous membranes with stable hierarchical nanostructures, excellent visible-light-driven photocatalytic activity, and easy-recycling ability would hold great promise in environmental remediation; however, it still remains a great challenge to construct such fantastic fibrous membranes. Herein, soft and hierarchical heterostructured BiOBr-anchored TiO2 nanofibrous membranes (BiOBr@TiO2 NFM) were fabricated by the sol–gel electrospinning technique combined with a facile successive ionic layer adsorption and reaction (SILAR) process. The well-crystallized BiOBr nanoplates with lamellar structure were uniformly grown onto TiO2 nanofibers, and the size and amount of BiOBr nanostructures could be finely regulated through rationally adjusting the growth cycles of SILAR. Benefiting from the large surface area, enhanced visible-light response, and intimately connected interfacial heterojunctions, the resultant membranes exhibited superior photocatalytic performance for rhodamine B (RhB) degradation under visible light irradiation, including a high degradation efficiency of 95.5% within 120 min and excellent reusability in 5 cycles. More importantly, the membranes still maintained good mechanical flexibility and structural integrity after utilization and could be directly extracted from solution. This study may provide a new strategy for the design and fabrication of soft hierarchical nanostructured TiO2-based fibrous membranes for environmental remediation and other potential applications.
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ChemNanoMat
·
2018
·Vol. 4
·期 11
·1133-1139
·
IF 3.173
Yiwei Hu,Tao Ding,Kailong Zhang,Biao Li,Baichuan Zhu,Kaibin Tang
Graphical At the interface : Component tunable rutile-anatase TiO 2 /RGO nanostructure shows excellent oxygen evolution reaction performance which is superior to reported TiO 2 -based materials, resulting from the enhancement of adsorption due to the electron transfer mechanism between rutile and anatase, as well as TiO 2 and RGO. As an earth-abundant and environment-friendly material, the potential of TiO 2 in many field, including oxygen evolution reaction (OER), has not yet been fully developed. Here, we fabricate component tunable rutile-anatase TiO 2 /reduced graphene oxide (RGO) nanocomposites with high OER activity which exhibit a current density of 10 mA cm −2 at an overpotential of 283 mV. The performance is superior to the previous reported TiO 2 (600 mV) and comparable with the leading results of other active materials. The catalytic mechanism is suggested according to our experimental results that the interactions between rutile and anatase, as well as RGO and TiO 2 result in the enhancement of adsorption of hydroxyl. Such an adsorption is advantageous to provide a surface reaction environment and reduce the activation energy of the electrochemical process, resulting in the best OER performance. This work should stimulate the design of more materials for the improvement of OER activity.
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MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Zhangxu Chen,Ming-Lai Fu
To extend the activities of TiO 2 to the near infrared (NIR) region and to separate and recycle photocatalysts easily is vital for the high harvest of solar energy for sustainable society. The magnetic NIR activated Fe 3 O 4 @SiO 2 /β-NaYF 4 :Yb 3+ ,Tm 3+ /TiO 2 (FS/UC/T) composites have been synthesized by using the solvothermal method by adding Fe 3 O 4 @SiO 2 and Degussa P25 into the mixed solution of NaOH, ethanol, oleic acid, Re(NO 3 ) 3 and NH 4 F. Moreover, the obtained composites were explored for photocatalytic applications. It was found that FS/UC/T emit UV–vis light under irradiation of 980 nm laser and efficient energy transfer from β-NaYF 4 :Yb 3+ ,Tm 3+ to TiO 2 was verified. The photodegradation experiments for treating methylene blue (MB), rhodamine B (RhB), methyl orange (MO) and colorless phenol were carried out to evaluate the photocatalytic activities of the samples. The photodegradation rates reach 76.62%, 68.48%, 30.05% and 27.16% for MB, RhB, MO and phenol under irradiation of 980 nm laser, respectively, which suggested magnetic FS/UC/T composite is an advanced NIR-driven photocatalyst. Moreover, the magnetic photocatalyst showed easy separation and good stability in the recycled tests. It suggested a promising system to utilize the NIR energy for photocatalysis based on TiO 2 and to utilize the magnetic for separation of photocatalysts, which will contribute to practical environmental remediation in the future.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Ruochong Zhang,Dan Qiao,Xuqing Liu,Zhiguang Guo,Litian Hu,Lei Shi
The dispersibility of TiO2 nanoparticles in polyalphaolefin (PAO) are improved by the interaction between the chemically modified TiO2 (denoted as TTO) and 1-methyl-2,4-bis (N-octadecylurea) benzene (MOB) gelator. Tribological tests show the outstanding friction-reducing and antiwear performances of PAO10–MOB–TTO under the common friction condition and higher temperature friction condition, respectively. The lubricating property of PAO10–1% MOB–0.5% TTO is further enhanced after UV irradiation for 40 min, which might be attributed to the photocatalytic effect of TTO under UV. The physical adsorption film is enhanced by the immobilization function of MOB. The chemical reaction film including various organic oxides and nitrides are produced for the active element in TTO and MOB. The antiwear performance is further improved by the “mending effect” of TTO with the good dispersibility. The combined effects of various factors promote the excellent lubricating performances of PAO10–1% MOB–0.5% TTO.
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JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Kairui Liu,Peifang Yan,Hong Jiang,Zhi Xia,Zhanwei Xu,Shi Bai,Z. Conrad Zhang
Selective hydrocleavage of aromatic C O bond while preserving the aromatic ring is a desired catalytic process in hydrodeoxygenation (HDO) of biomass derived aromatic oxygenates to high value biochemicals. Guaiacol with typical methoxy and phenolic hydroxyl groups is a representative aromatic di-oxygenates of lignin fragments. Sub-nanometer sized silver, a poor hydrogenation metal catalyst, was found to initiate H 2 dissociation and H spillover onto anatase TiO 2 (TiO 2 -A) surface. The spillover hydrogen enhanced the partial reduction of TiO 2 -A surface at a substantially lowered temperature as compared to the reduction of TiO 2 -A by molecular H 2 . The reduction of TiO 2 -A surface by spillover hydrogen was enhanced at Ag loading as low as 0.01 wt% on TiO 2 -A. The ratio of spillover H to Ag was as high as 675 at Ag loading of 0.01 wt% and the ratio decreased with increasing Ag loading. We found that the yield of phenolic products was linearly correlated with the amount of spillover hydrogen that created oxygen vacancy (Ov) through partial reduction of TiO 2 -A surface. Methanol was formed as the main side-product, indicating that the direct hydrocleavage of aromatic C-OCH 3 in guaiacol is favored over that of aromatic C-OH on the created site.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yi Chen,Wangyang Lu,Haibin Shen,Yan Gu,Tiefeng Xu,Zhexin Zhu,Gangqiang Wang,Wenxing Chen
Solar-driven photocatalysis has shown tremendous potential for environmental remediation, but photocatalysts with the strong oxidation ability usually destroy some organic carriers. Herein, we constructed a graphitic carbon nitride (g-C 3 N 4 )-shielding polyester fiber (PET)/titanium dioxide (TiO 2 ) composite (g-C 3 N 4 -TiO 2 @LMPET) by using g-C 3 N 4 as an isolation layer to protect the PET from the oxidation damage by hydroxyl radicals ( OH). The results of photoluminescence and photocurrent indicated that the g-C 3 N 4 -TiO 2 @LMPET has lower photogenerated charge recombination rate. Meanwhile, g-C 3 N 4 broadens the absorption range of the composite to visible region. Therefore, the g-C 3 N 4 -TiO 2 @LMPET composite exhibited a significantly enhanced photocatalytic performance toward the degradation of sulfaquinoxaline (SQX) and thiamethoxam under solar irradiation. Moreover, the g-C 3 N 4 -TiO 2 @LMPET exhibited good repeatability in cyclic experiments. Finally, the possible degradation pathways and mechanisms of SQX and thiamethoxam were proposed. Overall, our work provides a feasible method for constructing efficient and stable photocatalytic materials to eliminating emerging contaminants.
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