Applied Sciences-Basel
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2019
·Vol. 9
·期 5
·1008
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IF 2.217
Gaohong Zuo,Yingchao Du,Lianqi Wei,Bo Yu,Shufeng Ye,Xiaomeng Zhang,Hongshun Hao
Emulsified pickling waste liquid, derived from cleaning oily hardware, cause serious environmental and ecological issues. In this work, a series of grafted (3-aminopropyl)triethoxysilane (APTES) TiO2pillared montmorillonite (Mt), Ti-Mt-APTES, are prepared and characterized for their assessment in demulsification of acidic oil-in-water emulsion. After titanium hydrate is introduced through ion exchange, montmorillonite is modified by hydrophobic groups coming from APTES. The Ti-Mt-APTES in acidic oil-in-water emulsion demulsification performance and mechanism are studied. Results show that the prepared Ti-Mt-APTES has favorable demulsification performance. The Ti-Mt-APTES demulsification efficiency (ED) increased to an upper limit value when the mass ratio of APTES to the prepared TiO2pillared montmorillonite (Ti-Mt) (RA/M) was 0.10 g/g, and the 5 h is the optimal continuous stirring time for breaking the acidic oil-in-water emulsion by Ti-Mt-APTES. The EDincreased to 94.8% when 2.5 g/L of Ti-Mt-APTES is added into the acidic oil-in-water emulsion after 5 h. An examination of the demulsification mechanism revealed that amphiphilicity and electrostatic interaction both played vital roles in oil-in-water separation. It is demonstrated that Ti-Mt-APTES is a promising, economical demulsifier for the efficient treatment of acidic oil-in-water emulsions.Keywords:modified montmorillonite;oil-in-water emulsion;acidic demulsification;silane couple grafting
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2019
·
IF 2.722
Jianxin Liu,Fangxia Xie,Rui Li,Tan Li,Zehui Jia,Yunfang Wang,Yawen Wang,Xiaochao Zhang,Caimei Fan
A novel TiO 2-x /Ag 3 PO 4 composite photocatalyst with controllable oxygen vacancies (V o ·) amount was designedly prepared to avoid the photocorrosion and promote reduction capacity of Ag 3 PO 4 photocatalyst. The V o · on TiO 2-x work as molecular oxygen activation center trapping electron and O 2 to form ·O 2 - , and then avoided the electrons combine with h + and/or Ag + . Compared with Ag 3 PO 4 , TiO 2-x , and TiO 2 /Ag 3 PO 4 , TiO 2-x /Ag 3 PO 4 showed obviously efficient visible light and natural indoor weak light photocatalytic activity and stability for the photodegradation of Bisphenol A (BPA). The photoelectric conversion spectra, Ag 3d XPS narrow scan spectra, ESR DMPO-·O 2 - species spectra revealed that the TiO 2-x /Ag 3 PO 4 had a higher photocurrent density, lower photocorrosion and more generation of superoxide radical than those of Ag 3 PO 4 . Interestingly, compare with single h + degradation pathway over Ag 3 PO 4 , the h + and ·O 2 - synergistic degradation pathway over TiO 2-x /Ag 3 PO 4 is more beneficial to the BPA degradation. This work highlights the relations between the photocatalyst structure, active species and pollutant degradation pathway.
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NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 14
·5374-5381
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IF 3.069
Qiqian Gao,Liying Wang,Xueyu Zhang,Lianfeng Duan,Xuesong Li,Xijia Yang,Wei Lü
While the power conversion efficiency (PCE) of quantum dot-sensitized solar cells (QDSSCs) is still far below their theoretical efficiency, we herein provide a method to improve the solar cell performance by using carbon nanoparticles as a template to construct TiO2 mesoporous photoanodes. Carbon nanoparticles are obtained by microwave synthesis and are further mixed with TiO2 nanoparticles as a paste, and the photoanodes are prepared by spin-coating followed by thermal treatment. In comparison to the photoanodes fabricated from pure TiO2 nanoparticles, the performance of the cells that are prepared from the carbon nanoparticle template assisted mesoporous TiO2 photoanodes show obvious improvement. The best performance is achieved with a carbon nanoparticle content of 15 wt% in the photoanode. A maximum PCE of 4.41% is achieved, giving a 35.3% enhancement in cell efficiency. Systematic investigations are carried out to reveal the role of the carbon nanoparticles in the photoanode performance and the corresponding mechanism is proposed.
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Frontiers in Materials
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2019
·
IF 2.689
Xie Lijuan,Li Zhong,Sun Linchao,Dong Baoxia,Fatima Qawareer,Wang Zhe,Yao Zhengjun,Haidry Azhar Ali
Titanium dioxide is considered as one of the potential candidates for high-temperature gas sensing applications due to its excellent sensitivity and stability. However, its practical use as a gas sensor under elevated conditions is limited on account of its selectivity and insufficient understanding of response conversion from n- to p-type. To this context, the present work is intended to prepare and understand the p-type response of anatase TiO2 toward H2 gas (20–1,000 ppm) at elevated temperature (500°C). Sol-gel route is adopted to facilely synthesize powders containing pure and chromium (1–10 at.%) doped TiO2 nanoparticles, which are then brushed onto substrates with already patterned inter-digitated platinum electrodes. In this work, even, the undoped TiO2 samples showed p-type gas sensing response, which then decreased with Cr doping. However, in comparison to previously reported work, the sensing characteristics of all sensors is improved. For instance, 5 at.% Cr-TiO2 showed high response (147), fast response and recovery (142/123s) time, and good selectivity to hydrogen against monoxide and methane. Despite better response values, the TiO2 based samples show instability and drift in baseline resistance; such issues were not observed for Cr-doped TiO2 samples (≥3 at.%). The powders were further analyzed by XRD, SEM, TEM, and XPS to understand the basic characteristics, p-type response and stability. Further, a plausible sensing mechanism is discussed on basis of results obtained from aforementioned techniques.
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Energy Technology
·
2019
·Vol. 7
·期 7
·1801128
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IF 3.163
Weicheng Cui,Hongye Bai,Konggang Qu,Fagen Wang,Peng Guan,Dongbo Xu,Weiqiang Fan,Weidong Shi
Kinetics play a critical role in the photoelectrochemical (PEC) system, whereas co-catalysis is mainly responsible for reducing the reaction barrier and facilitates water splitting. Here, the unsaturated Fe sites through the metal-organic framework (MOFs) structure promote the kinetics of water oxidation over TiO 2 are successfully in situ decorated. This heterostructure further helps us to better understand the PEC behaviors of organic–inorganic hybrid systems. MIL-100(Fe), as the typical MOFs model, is facilely achieved by an FeOOH sacrificial template method, a strategy which could anchor the compact and ultrathin MIL-100(Fe) films on the surface of TiO 2 to obtain abundant unsaturated Fe sites. The photocurrent density of MIL-100(Fe)/TiO 2 reaches about 2.4 times at 1.23 V vs reversible hydrogen electrode (RHE) compared with bare TiO 2 , and the incident photon to current conversion efficiency value increases up to 47% (at 390 nm). Furthermore, the photocurrent density of MIL-100(Fe)/TiO 2 is maintained at 84% after 3 h, showing that the organic component of MIL-100(Fe) takes a nature of favorable stability. The configuration of MIL-100(Fe)/TiO 2 will bring a new insight for learning the basic function of unsaturated metal sites in the PEC system.
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APPLIED SURFACE SCIENCE
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2019
·
IF 5.155
Xueping Dai,Yan Wang,Xiao Wang,Shengrui Tong,Xiaofeng Xie
The surface adsorption is considered to be a very important factor in photodegradation process, especially in the removal of gaseous pollutants. In this work, nitrogen doped reduced graphene (N-GR)/TiO 2 were synthesized to probe the polarity adsorption and photodegradation characteristics of acetaldehyde (polar) and ethylene (nonpolar). Morphology and properties of the samples were revealed by TEM , Raman spectra , photoluminescence spectra, photocurrent , electron spin resonance and so forth. Adsorption of flowing gas and TPD were used to indicate the adsorption ability of the composites towards acetaldehyde and ethylene. In experiments, the difference of nitrogen doping amount can adjust the polarity of N-GR/TiO 2 composites efficiently and then influence their photodegradation performance. Specifically, the N-GR/TiO 2 showed higher acetaldehyde adsorption capacity than GR/TiO 2 , while the GR/TiO 2 possessed the highest adsorptive abilities in ethylene case. In the subsequent photodegradation tests of flowing acetaldehyde, all of the N-GR/TiO 2 samples had removal efficiencies higher than that of GR/TiO 2 . The highest removal efficiency reached by the 2 N-GR/TiO 2 is around 82%. In the ethylene to contrast, the removal efficiency was obtained as 93.8% by GR/TiO 2 , which is higher than that of the N-doped samples. It can be seen that the high polarity samples could improve the adsorption and photodegradation performance of polar molecules , which could propel the understanding and application of photodegradation technologies.
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BIOSENSORS & BIOELECTRONICS
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2019
·
IF 9.518
Liwei Yang,Xiaoqiang Liu,Lele Li,Si Zhang,Hejie Zheng,Yunfei Tang,Huangxian Ju
This work designed a MgIn 2 S 4 -TiONA heterojunction by growing MgIn 2 S 4 nanoplates on TiO 2 nanowire array (TiONA) for preparation of visible light photoelectrochemical (PEC) sensing platform. The heterojunction exhibited strong absorption of visible light, large surface area and high loading of biomolecules , leading to high sensing sensitivity. Using adenosine triphosphate (ATP), a marker of cell vitality, as the target model, a PEC sandwich aptasensor was constructed by immobilizing capture DNA 1 on MgIn 2 S 4 surface. In the presence of ATP and signal DNA 2 with terminal ferrocene as the electron donor , a sandwiched DNA 1 -ATP-DNA 2 complex could be formed on the PEC aptasensor. The aptasensor showed excellent performance with a wide linear range from 50 fM to 100 nM and a detection limit of 20 fM. The sensing performance including specificity, reproducibility, stability and practical use were also evaluated, showing promising application of the MgIn 2 S 4 -TiONA heterojunction in PEC biosensing.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
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2020
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IF 8.758
Wenliang Feng,Rudi Ruben Maça,Vinodkumar Etacheri
Sodium-ion hybrid capacitors are known for their high power densities and superior cycle life compared to Na-ion batteries. However, low energy densities (<100 Wh kg–1) due to the lack of high-capacity (>150 mAh g–1) anodes capable of fast charging are delaying their practical implementation. Herein, we report a high-performance Na-ion hybrid capacitor based on an interface-engineered hierarchical TiO2 nanosheet anode consisting of bronze (∼15%) and anatase (∼85%) crystallites (∼10 nm). This pseudocapacitive dual-phase anode demonstrated exceptional specific capacity of 289 mAh g–1 at 0.025 A g–1 and excellent rate capability (110 mAh g–1 at 1.0 A g–1). The Na-ion hybrid capacitor integrating a dual-phase hierarchical TiO2 nanosheet anode and an activated carbon cathode exhibited a high energy density of 200 Wh kg–1 (based on the total mass of active materials in both electrodes) and power density of 6191 W kg–1. These values are in the energy and power density range of Li-ion batteries (100–300 Wh kg–1) and supercapacitors (5000–15 000 W kg–1), respectively. Furthermore, exceptional capacity retention of 80% is observed after 5000 charge–discharge cycles. Outstanding electrochemical performance of the demonstrated Na-ion hybrid capacitor is credited to the enhanced pseudocapacitive Na-ion intercalation of the two-dimensional TiO2 anode resulting from nanointerfaces between bronze and anatase crystallites. Mechanistic investigations evidenced Na-ion storage through intercalation pseudocapacitance with minimal structural changes. This approach of nanointerface-induced pseudocapacitance presents great opportunities toward developing advanced electrode materials for next-generation Na-ion hybrid capacitors.
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ACS Nano
·
2019
·
IF 13.903
Jingwen Xu,Ning Liu,Di Wu,Zhida Gao,Yan-Yan Song,Patrik Schmuki
The low penetration depth of UV light in mammalian tissue is the critical limitation for the use of TiO2-based photocatalysis in biomedical applications. In this work, we develop an effective near-infrared (NIR)-active photocatalytic platform that consists of a shell structure of upconversion nanocrystals decorated on a core of Au/dark-TiO2. The heart of this system is the strong photocatalytic activity in the visible region enabled by the gold surface-plasmon resonance on dark TiO2 (D-TiO2). Simulation and experiment demonstrate for an optimized Au/D-TiO2 combination a highly enhanced light absorption in the visible range. Using ampicillin sodium (AMP) as model drug, we exemplify the effective use of this principle by demonstrating a NIR light-triggered photocatalytic payload release. Importantly, the photocatalytically generated reactive oxygen species can effectively inactivate AMP-resistant bacteria strains, thus maintaining an antibacterial effect even after all drug is released. Overall, we anticipate that the here-introduced NIR-light-active photocatalytic cascade can considerably widen TiO2-based photocatalysis and its applications into the infrared range.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 26
·48830
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IF 2.188
Gang Wang,Fei Wang,Anfeng Li,Miaomiao Zhang,Jie Zhang,Jinwei Chen,Ruilin Wang
The SPEEK/s-TiO 2 composite membrane was prepared by blending sulfonated poly(ether ether ketone) (SPEEK) and sulfonated titanium dioxide (s-TiO 2 ) nanoparticles. The important physiochemical parameters such as proton conductivity, water uptake, swelling degree and ion exchange capacity of the composite membrane were measured. The thermal stability and chemical stability were also tested. It was observed that the SPEEK/s-TiO 2 composite membrane exhibited the best selectivity (7.13 × 10 4 S·min·cm −3 ) accompanying high proton conductivity (0.061 S·cm −1 ) and low tetravalent vanadium ion (VO 2+ ) permeability (8.55 × 10 −7 cm 2 ·min −1 ) compared with Nafion117, SPEEK and SPEEK/TiO 2 membranes. The battery performance with these membranes was characterized by charge–discharge cycling tests and it was found that the SPEEK/s-TiO 2 composite membrane showed the highest energy efficiency (EE) up to 82.3%, indicating the SPEEK/s-TiO 2 composite membrane is a candidate for vanadium redox flow battery (VRFB) application. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48830.
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ACS Applied Nano Materials
·
2019
·
IF 0
Xianke Zhang,Li Li,Yuqiang Zeng,Feng Liu,Jujun Yuan,Xiaokang Li,Yi Yu,Xiurong Zhu,Zuzhou Xiong,Huajun Yu,Yingmao Xie
Surface-fluorinated ultrathin anatase TiO2 nanosheets with exposed (001) crystal planes were synthesized via a relatively low temperature solvothermal route. These two-dimensional (2D) TiO2 nanosheets demonstrated higher photocatalytic activity for degrading Rhodamine B (RhB) under simulated sunlight illumination than the corresponding sample with less fluorine ions (F–) content, which indicates the positive effect of F– on the enhanced photocatalytic performance of TiO2 nanosheets. Furthermore, 2D/2D TiO2/g-C3N4 nanosheet heterojunctions were fabricated through a solvent evaporation process. The photocatalysis test showed that TiO2/g-C3N4 exhibited higher photocatalytic performance for degrading RhB under simulated solar light illumination than pure g-C3N4 and TiO2 nanosheets. Based on free radical trapping experiments, superoxide radicals (·O2–) and photoinduced holes (h+) were determined to be the predominant active species for photodegrading RhB. A direct Z-scheme charge transfer mechanism is proposed to understand the enhanced photocatalytic activity in TiO2/g-C3N4 nanosheet heterojunctions.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2019
·Vol. 46
·期 1
·149-164
·
IF 2.064
Sun Jialin,Dai Jingtao,Liu Rui,Yang Xiaowei,Chen Jian
To improve the visible-light catalytic performance of TiO 2 for practical application, Ag/AgBr modified TiO 2 was fabricated in ionic liquid–water medium via a facile hydrothermal reduction method. Imidacloprid (IMI) was employed as the target pollutant to evaluate the critical impacts on the catalytic activity of as-prepared Ag/AgBr/TiO 2 , where the factors relating to the catalyst (composition, dosage, recycle and reuse) and solution chemistry (pH and concentration, simulated wastewater samples and floodwater of rice paddy field) were studied. The results suggested that benefitting from visible-light sensitive Ag/AgBr and high specific surface area TiO 2 , Ag/AgBr/TiO 2 exhibits superior visible-light photocatalytic activity and stability to Ag/AgBr and TiO 2 . The quenching tests with various scavengers indicate that · O 2 − and h + , and · O 2 − and · OH may be the key roles in IMI photo-degradation on Ag/AgBr and on Ag/AgBr/TiO 2 , respectively. Thus, the photocatalytic performance of Ag/AgBr/TiO 2 differs from that of Ag/AgBr. Furthermore, the contribution of such active species is clarified for quantitative mechanisms study. The photo-degradation conducted in the simulated wastewater and the floodwater of rice paddy field proves favorable anti-interference capacity of Ag/AgBr/TiO 2 . The tests conducted on real wastewater sample verified that Ag/AgBr/TiO 2 can mineralize IMI promptly and almost completely.
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