APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Guozhong Zhang,Shuqu Zhang,Longlu Wang,Ran Liu,Yunxiong Zeng,Xinnian Xia,Yutang Liu,Shenglian Luo
The scrupulous design of hierarchical structure and highly active crystal facets exposure is essential for the creation of photocatalytic system. However, it is still a big challenge for scrupulous design of TiO 2 architectures. In this paper, bird’s nest-like anatase TiO 2 microstructure with exposed highly active (001) surface has been successfully synthesized by a facile one-step solvothermal method. Methylene blue (MB) is chosen as a model pollutant to evaluate photocatalytic activity of as-obtained TiO 2 samples. The results show that the photocatalytic activity of the bird’s nest-like sample is more excellent than P25 in the degradation of MB due to high specific surface area and highly active (001) crystal facets exposure when tested under simulated solar light. Besides, it can be readily separated from the photocatalytic system by sedimentation after photocatalytic reaction, which is a significant advantage against conventional powder photocatalyst. The bird’s nest-like microspheres with novel structure may have potential application in photocatalysis and other fields.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2016
·Vol. 20
·期 6
·1783-1792
·
IF 2.327
Yan Huiqiong,Chen Xiuqiong,Shi Zaifeng,Feng Yuhong,Li Jiacheng,Lin Qiang,Wang Xianghui,Sun Wei
In this work, electrodeposition of the mixture of myoglobin (Mb), sodium alginate (SA), and TiO 2 nanoparticles on the carbon ionic liquid electrode (CILE) was performed to fabricate the modified electrode which was abbreviated as Nafion/Mb-SA-TiO 2 /CILE. FT-IR and UV-vis absorption spectra confirmed that Mb could retain its native structure after being immobilized in the SA-TiO 2 composite film. The electrochemical characterization of Nafion/Mb-SA-TiO 2 /CILE revealed that a pair of symmetric redox peaks appeared in the cyclic voltammograms, indicating that direct electron transfer of Mb was realized on the modified electrode. The good biocompatibility of SA, the good electrocatalytic capability of TiO 2 nanoparticles, and their synergistic effects were beneficial to the electron transfer between Mb and CILE. The electrochemical parameters of the electron transfer number ( n ), the charge transfer coefficient ( α ), and the electron transfer rate constant ( k
s
) were calculated as 1.032, 0.402, and 0.511 s −1 , respectively. The modified electrode exhibited good electrocatalytic ability to the reduction of trichloroacetic acid (TCA) and displayed wide linear range from 5.3 to 114.2 mmol/L and low detection limit as 0.152 mmol/L (3 σ ). The apparent Michaelis-Menten constant K
M
app was 32.3 mmol/L. The proposed electrode with good stability and reproducibility had the potential application in the third-generation electrochemical biosensors.
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RSC Advances
·
2016
·Vol. 6
·期 37
·31107-31113
·
IF 3.289
Yanzhou Jiang,Guangdi Nie,Maoqiang Chi,Zezhou Yang,Zhen Zhang,Ce Wang,Xiaofeng Lu
In this work, we demonstrate the fabrication of polypyrrole (PPy) decorated TiO2/Fe2O3 (TiO2/Fe2O3/PPy) composite nanofibers with a core–shell structure as an artificial enzyme system with a high peroxidase-like activity. The TiO2/Fe2O3 nanofibers with a diameter in the range of 40–150 nm and a relatively narrow distribution of diameter size are prepared via an electrospinning technique and followed by a calcination process. Then we are able to in situ polymerize a layer of PPy on the surface of the TiO2/Fe2O3 nanofibers by using Fe2O3 on the surface of nanofibers as an oxidant. The resulting ternary TiO2/Fe2O3/PPy composite nanofibers exhibit an enhanced peroxidase-like activity toward the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H2O2 over independent TiO2, Fe2O3 and TiO2/Fe2O3 composite nanofibers due to the synergistic effect. On the basis of the high peroxidase-like activity, a simple approach for the colorimetric detection of H2O2 with a detection limit of 2.4 μM and a linear detection range from 2 to 50 μM has been proposed. This work offers a new way for manipulating the enzyme-like performance of electrospun nanofibers for a wide range of potential applications in biosensing and environmental monitoring.
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Molecular Catalysis
·
2017
·
IF 0
Wenwen Ma,Yan Xu,Kaiwen Ma,Yuhui Luo,Yushuang Liu,Hong Zhang
PW 11 Sn/TiO 2 (PW 11 Sn = (OTA) 3 PW 11 SnO 39 , OTA = octadecyl trimethyl ammonium) nanofibres with tunable rutile/anatase phase have been successfully prepared via combining with electrospinning and hydrothermal method . The crystal phase of TiO 2 was influenced by the loading amount of PW 11 Sn and the desulfurization efficiency was related with the crystal phase of TiO 2 . When the loading amount of PW 11 Sn on TiO 2 nanofibres was 50%, DBT could be completely removed using 0.02 g PW 11 Sn/TiO 2 nanofibres as catalysts and [Bmim]PF 6 as extraction agent at 60 °C within 20 min, when O/S value was 6:1. Furthermore, the influences of different morphologies and preparation methods for catalysts on desulfurization efficiencies were investigated in detail. This catalyst can be recovered easily and reused at least 7 times maintaining the catalytic activity. For different substrates, the efficiencies of sulfur removal decreased as the following orders: DBT > 4,6-DMDBT > BT under the same conditions. Finally, the mechanism of desulfurization was also elucidated.
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ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Jiabai Cai,Xueqing Wu,Shunxing Li,Fengying Zheng
A new nanocomposite was reported as a good-performance photocatalyst, i.e., double-shelled, positively and negatively charged, nanostructured hollow spheres with supported Au nanoparticles (NPs). TiO2, WO3, and Au NPs were coated successively onto the functionalized polystyrene (PS) template spheres. The as-synthesized product PS@TiO2@WO3/Au nanocomposites were calcined at elevated temperature and then intact double-shelled TiO2@WO3/Au hollow spheres were obtained. The dispersity, morphology, size, and lattice of TiO2@WO3/Au hollow spheres were investigated by SEM and TEM. The presence of TiO2 hollow sphere and WO3/Au shell was proved by HAADF-STEM and XRD images. The photodegradation activity for rhodamine B and trimesic acid (i.e., color and colorless aromatic pollutants) in decreasing order were TiO2@WO3/Au, TiO2–WO3, P25. Under visible-light irradiation, the photodegradation rate of rhodamine B and trimesic acid for TiO2@WO3/Au was 94% and 95%, respectively, which exhibited a significant increase of 62% and 80% as compared with P25. The synergistic effect of coupling TiO2 hollow spheres with WO3 shell and Au NPs on photocatalytic performance was proved by this article. First, Au NPs deposited in WO3 shell and loaded on TiO2 shell separately act as electron trap site and surface plasmon resonance-sensitizer, respectively, and hence the photogenerated electron–hole separation rate was improved. Second, the visible-light absorption of TiO2 hollow spheres was increased by the coexistence of WO3 and Au and unique hierarchical mesoporous architectures of TiO2@WO3/Au. Finally, the surface charge of TiO2@WO3/Au and rhodamine B was negative and positive, respectively, the affinity between them could be improved by electrical attractions, and then the major bottleneck in heterogeneous photocatalysis (i.e., poor affinity between pollutants and photocatalyst) could be broken. The optimal hollow sphere size of TiO2@WO3/Au was 450 nm, which was proved by the photodegradation of aromatic pollutants and photoreduction of Cr(VI).
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MATERIALS CHEMISTRY AND PHYSICS
·
2016
·
IF 2.101
Kexin Li,Shufen Liu,Shaoting Yi,Liushui Yan,Huiqin Guo,Yuhua Dai,Xubiao Luo,Shenglian Luo
Nitryl surface functionalized TiO 2 hollow spheres (TiO 2 -NO 2 HSs) composite material was successfully fabricated by a simple sol-gel combined with solvothermal and concentrated HNO 3 treatment strategy using carbon microspheres obtained from hydrothermal carbonization of waste Camellia oleifera shells as a template. The microstructure, surface property, compositional and structural information, and optical and electronic property of as-prepared TiO 2 -NO 2 HSs were well characterized. Compare with conventional g-C 3 N 4 and TiO 2 photocatalysts , the as-prepared TiO 2 -NO 2 HSs exhibited excellent simulated sunlight photocatalytic activity toward aqueous organic pollutants degradation and hydrogen evolution from water-splitting, which can be attributed to their unique hollow spherical microstructure and the introduction of -NO 2 groups.
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NANO
·
2016
·
IF 0.951
Zhiguo Sun,Jitao Yang,Li Zhang,Hongyong Xie
A new photocatalyst of sodium humate (HA–Na)/Nano-TiO 2 coating on the glass spheres for flue gas denitrification (DeNO x ) was prepared using the impregnation method. The HA–Na/TiO 2 is characterized by Brunauer–Emmett–Teller (BET), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscope (SEM). The photocatalytic activity of HA–Na/TiO 2 on removing NO x was investigated in a self-designed photocatalytic reactor. The synergistic mechanism of HA–Na and TiO 2 on DeNO x is also proposed and demonstrated. The experimental results indicate that specific surface area and average pore size of HA–Na are improved owing to the mixed TiO 2 nanoparticles. The crystal structure of TiO 2 has little change after mixing with HA–Na. Due to high photocatalytic performance of TiO 2 , NO was oxidized to NO 2 and HNO 3 eventually. On the other hand, HA–Na support can absorb and react with HNO 3 , which accelerates 10% of the catalytic reaction of TiO 2 and the utilization of light source. The chemical and physiological activity of oxidized HA–Na are improved than the original humate. The HA–Na/TiO 2 photocatalysts show great property on eliminating NO x because of the promoting effect between HA–Na and TiO 2 , and the NO removal efficiency can reach to 80% at the optimum condition.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2015
·
IF 1.098
Yu Niu,Fuying Li,Kai Yang,Ting Qiu,Renzhang Wang,Cheng Lin
A unique Rh/TiO 2 solid acid catalyst modified with H 2 SO 4 was synthesized and evaluated in the esterification reaction of propylene glycol methyl ether and decomposition of methyl orange (MO) in aqueous phase under halogen lamp irradiation. For this purpose, rhodium (Rh) nanoparticles were loaded on SO 4 2 − /TiO 2 via the photo-deposition method. It was found that SO 4 2 − /Rh–TiO 2 exhibited stronger catalytic activity than SO 4 2 − /TiO 2 . The new catalysts were characterized by X-ray powder diffraction (XRD), Brunauer–Emmett–Teller (BET), Transmission electron microscopy (TEM) and high-resolution (HRTEM), X-ray photoelectron spectroscopy (XPS) and Fourier Transform infrared spectroscopy (FTIR). Results from XRD and BET show that SO 4 2 − /Rh–TiO 2 has higher specific surface area and smaller pore size than SO 4 2 − /TiO 2 . The distribution of loaded Rh was found to be uniform with a particle size of 2–4 nm. Data from XPS reveal that Rh primarily exists as Rh 0 and Rh 3 + in Rh–TiO 2 and SO 4 2 − /Rh–TiO 2 . These valence forms of Rh likely contribute to the enhanced catalytic activity. Furthermore, FT-IR spectra of the catalysts show an abundance of surface hydroxyl groups, which help the formation of hydroxyl radicals and the enhancement of surface acid density. The results show that more acid sites are formed on the sulfated Rh–TiO 2 , and these acidic sites are largely responsible for improving the catalytic performance. This superior SO 4 2 − /Rh–TiO 2 catalyst has potential applications in reactions requiring efficient acid catalysts, including esterification reactions and waste water treatment.
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Journal of Materials Chemistry A
·
2015
·Vol. 4
·期 5
·1806-1818
·
IF 7.443
Zhifeng Jiang,Chengzhang Zhu,Weiming Wan,Kun Qian,Jimin Xie
Graphitic carbon nitride (g-C3N4) was hybridized by hierarchical yolk–shell TiO2 spheres via a solvothermal method by mixing the as-prepared g-C3N4 with the precursor of the TiO2 yolk–shell spheres in dimethylformamide (DMF). The introduction of DMF made the TiO2 yolk–shell spheres to be dispersed well on the surface of g-C3N4, thus improving the specific surface area of the materials. The g-C3N4 has a unique two-dimensional layered structure, which is favorable for hybridizing with TiO2. The sufficient contact interface between TiO2 and g-C3N4 could be beneficial to the separation of photogenerated charges. Multiple reflections of light within the interior cavities of titania microspheres with a yolk–shell structure can increase their light absorption. The photocatalytic experimental results indicated that the as-prepared composite TiO2/g-C3N4 (TCN) showed enhanced photocatalytic activities compared with pure TiO2 and g-C3N4. A suitable combination of g-C3N4 with TiO2 produced the highest photocatalytic activity. Moreover, the photocatalytic activity of TCN with a yolk–shell structure is higher than that of TiO2/g-C3N4 without a yolk–shell structure. Based on our experimental results, a possible photocatalytic mechanism with holes and superoxide radical species as the main active species in photocatalysis was proposed. The TCN photocatalysts prepared in this case, with high photocatalytic activity and high stability, were a promising candidate for possible practical application in industrial production.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Yang Zhang,Xintong Zhang,Dan Wang,Fangxu Wan,Yichun Liu
Introducing appropriate amount of oxygen vacancies by hydrogenation treatment is a simple and efficient way to improve the photoelectrochemical performance of nanostructured oxide photoanodes. However, the hydrogenation effect is often not durable due to the gradual healing of oxygen vacancies at or close to surface of photoanodes. Herein, we tackled the problem by conformal coating the hydrogenated nanoporous BiVO 4 (H-BiVO 4 ) photoanode with an ultrathin layer of amorphous TiO 2 . Photoelectrochemical measurements showed that a 4 nm-thick TiO 2 layer could significantly improve the stability of H-BiVO 4 photoanode for repeated working test, with negligible influence on the initial photocurrent compared to the uncoated one. Mott–Schottky and linear sweep voltammetry measurements showed that donor density and photocurrent density of the H-BiVO 4 electrode almost decayed to the values of pristine BiVO 4 electrode after 3 h test, while the amorphous TiO 2 -coated electrode only degraded by 6% and 5% of the initial values respectively in the same period. The investigation thus suggested that the amorphous TiO 2 layer did protect the oxygen vacancies in H-BiVO 4 photoanode by isolating these oxygen vacancies from environmental oxygen, while at the same time not impeding the interfacial charge transfer to water molecules due to its leaky nature.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Minghua Wang,Lifang Cai,Qingxian Jin,Hongzhong Zhang,Shaoming Fang,Xiongwei Qu,Zhihong Zhang,Qingxin Zhang
Three-dimensional graphene oxide (3D-GO), poly(vinyl alcohol) (PVA), and TiO 2 microspheres (3D-GO/PVA/TiO 2 ) composite was prepared via one-pot synthesis by using aqueous suspension of PVA and 3D-GO sheets as support in the presence of TiO 2 microspheres. Photocatalytic activity of 3D-GO/PVA/TiO 2 toward dyes was enhanced by the improved adsorption performance caused by the rich π-conjugation structure of GO and porous 3D-GO/PVA sheets. Methylene blue (MB) and methyl violet (MV) were adsorbed onto the resultant composite in dark for 30 min and irradiated under simulated solar light for 2 h. Degradation ratios of MB and MV were approximately 95% and 96%, respectively. Results from the evaluation of repeatability toward MB and MV degradation showed that the 3D-GO/PVA/TiO 2 composite were stable and reusable. Therefore, this novel composite may be applied in the treatment of wastewater polluted by dyes and in environmental cleaning.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Xuefeng Liu,Zipeng Xing,Yan Zhang,Zhenzi Li,Xiaoyan Wu,Siyu Tan,Xiujuan Yu,Qi Zhu,Wei Zhou
As is well-known, it is a great challenge that the smooth TiO 2 nanospheres are coated by MoS 2 nanosheets to form the core-shell nanostructure owing to their poor interaction. Herein, we report 3D black N-TiO 2-x @MoS 2 core-shell nanostructures synthesized by a mild and effective strategy combined with a typical hydrothermal reaction and an in situ solid-state chemical reduction method followed by 350 °C calcination under an argon atmosphere. The prepared samples are characterized in detail by X-ray diffraction, Raman, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The results suggest that the 3D N-TiO 2-x @MoS 2 photocatalyst is successfully doped with N and Ti 3+ , and simultaneously coupling with MoS 2 to form the core-shell heterojunction nanostructure. The N and Ti 3+ co-doped and hybrid heterostructures can effectively utilize visible-light and solar energy to degrade methyl orange and produce hydrogen. The degradation rate of methyl orange and the hydrogen production rate are as high as 91.8% and 1.882 mmol h −1 g −1 . To the best of our knowledge, this work is the first instance of combining MoS 2 with N and Ti 3+ co-doped TiO 2 , and the proposed photocatalytic mechanism will provide a new perspective for high activity photocatalyst in future.
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