ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2021
·Vol. 413
·期 8
·2045-2054
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IF 4.157
Deng Xunxun,Yang Xinlan,Guan Xingxing,Song Jie,Wu Shuo
A photoelectrochemical (PEC) immunosensing strategy based on the multiple quenching of polydopamine nanoparticles (PDA NPs) to Mn 2+ -doped CdS-modified TiO 2 nanoparticles (TiO 2 /CdS:Mn) was designed for the highly sensitive detection of carcinoembryonic antigen (CEA). The uniform PDA NPs possessed good dispersibility, good biocompatibility, and abundant functional groups for biomolecule assembly. They also had unique photophysical properties, with light absorption spanning the visible to infrared light range. When the immune-recognition brought the PDA NPs close to the TiO 2 /CdS:Mn interface, the PDA NPs competed with TiO 2 /CdS:Mn to absorb light, consumed photoelectrons generated in the TiO 2 /CdS:Mn, and hindered the access of electron donors to photoactive materials. The contribution from these aspects thus led to a significant decrease in photocurrent. Benefiting from the multiple quenching mechanism, the PEC immunosensor showed high sensitivity for CEA detection. Under optimal conditions, a low detection limit of 0.02 pg/mL and a wide linear relationship from 0.1 pg/mL to 100 ng/mL were obtained. The immunoassay showed good reproducibility and stability, and good selectivity and high accuracy in serum sample analysis. In this regard, PEC immunosensors may have great application potential for screening tumor markers and the prevention and monitoring of serious diseases.
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PubMed
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2021
·Vol. 96
·期 6
·1553-1560
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IF 3.174
Sibo Li,Jiaxun Zhang,Hualiang An,Guirong Wang,Xinqiang Zhao,Yanji Wang
BACKGROUND The reaction integration of butanal self-condensation and successive hydrogenation (that is, one-step synthesis of 2-ethylhexanol from butanal) is an efficiency way to simply process flow and reduce energy consumption for the commercial manufacture of 2-ethylhexanol (2EHO). In the present work, a NiO-MnO 2 /Nb 2 O 5 -TiO 2 catalyst was prepared for the integration reaction to reach a high 2-ethylhexanol selectivity. Furthermore, the reaction integration was investigated kinetically for the next scale-up. RESULTS A 2EHO selectivity of 90.0% was achieved at a complete conversion of butanal with the help of reduction-in-reaction technique in this reaction integration. The reaction rate of butanal is determined by the reversible aldol self-condensation reaction and its direct hydrogenation reaction. The reaction order with respect to butanal in the two reactions is, respectively, 2.004 and 1.004. The activation energy of the hydrogenation reaction is higher than that of the forward reaction of the self-condensation, suggesting the suppressive effect the reaction integration on the direct hydrogenation. CONCLUSION The reaction integration promotes butanal self-condensation and successive hydrogenation and it suppresses butanal direct hydrogenation by using NiO-MnO 2 /Nb 2 O 5 -TiO 2 catalyst with the help of reduction-in-reaction technique, giving rise to a pretty high selectivity of 2-ethylhexanol. The establishment of the integration reaction kinetics will lay the foundation for reactor design and analysis. © 2021 Society of Chemical Industry
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Bo Yu,Fanming Meng,Ting Zhou,Aoyu Fan,Muhammad Wasim Khan,Hao Wu,Xingbin Liu
The plasma semiconductor Cu 2-x S has disclosed enormous potential in the field of broad-spectrum driven photocatalyst design due to its unique LSPR effect in the NIR region. Nevertheless, ineffective carrier separation and severe photocorrosion hinder the further functional applications of this promising material. Here, the TiO 2 @CuS double-shell nanoboxes were successfully constructed via a multistep control strategy involving template participation, and were firstly employed to broad-spectrum photocatalytic hydrogen evolution and pollutant elimination. The hollow core-shell nanocubes with LSPR effect have prominent advantages in broad-spectrum light response, improved photocharge separation and effective photocorrosion inhibition. Besides, the heterogeneous cavity structure also provides a larger specific surface area and ameliorates the light efficiency. Consequently, the optimized TiO 2 @CuS double-shell nanoboxes exhibit superior activity for H 2 production under full-spectrum/NIR light irradiation (2467 and 173 μmol g −1 h −1 , respectively), and maintain high activity in the photodegradation of stubborn pollutants. This work will motivate hollow photocatalysts designed to effectively utilize the spectrum and protect the sulfide core.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Tao Ke,Shuyi Shen,Krishnamoorthy Rajavel,Kun Yang,Daohui Lin
Construction of heterojunction and nitrogen doping is an effective approach for synthesizing photocatalysts with high quantum yield and efficient electron-hole separation. 2D MXene Ti 3 C 2 has been considered a good carbonaceous nanomaterial for designing heterojunction, while the original surface groups and stacked structure limit the electron-hole separation. Herein, a hybrid of nitrogen-doped Ti 3 C 2 nanosheets and TiO 2 nanoparticles (NPs) composed of TiO 2 NPs in situ growing on isopropyl amine (iPA) modified Ti 3 C 2 (iN-Ti 3 C 2 ) was developed for the first time. The novel iN-Ti 3 C 2 /TiO 2 hybrid exhibited an excellent ultraviolet-light photodegradation of methylene blue (MB), with a degradation rate (0.02642 min −1 ) significantly higher than that of pure TiO 2 NPs, bulk-Ti 3 C 2 /TiO 2 , dimethyl sulfoxide modified Ti 3 C 2 /TiO 2 hybrid, and hydrazine monohydrate modified Ti 3 C 2 /TiO 2 hybrid. The formation of heterojunction between iN-Ti 3 C 2 and TiO 2 and its role in the photocatalysis were systematically analyzed using various characterization techniques and density functional theory calculation. The iPA modification exfoliated Ti 3 C 2 and doped N on Ti 3 C 2 nanosheets; the in situ grown TiO 2 NPs formed efficient heterojunctions with the nanosheets; the N-doping facilitated electron migration in Ti 3 C 2 and inhibited the recombination of photogenerated electron-hole pairs; •OH dominated the photodegradation of MB. This work provides a new approach of constructing efficient photocatalysts for the treatment of organics-polluted water.
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高影响因子
POWDER TECHNOLOGY
·
2020
·
IF 4.142
Xueliang Jiang,Zitong Peng,Yanrong Gao,Feng You,Chu Yao
Using melamine-formaldehyde as template, tetrabutyl titanate as titanium source, and ytterbium nitrate as ytterbium source, the Ag-loaded double-shell TiO 2 @Y 2 O 3 hollow microspheres with TiO 2 as inner layer and Y 2 O 3 as outer layer were prepared by sol-gel method and high-temperature calcinations reduction. The characterization of hollow microspheres shows that the Ag-loaded TiO 2 @Y 2 O 3 hollow microspheres show regular morphology, uniform size and distinct double-shell hollow structure. Ag exists as the zero-valent form in the double-shell hollows spheres mainly. The results of Uv-visible diffuse reflection analysis and photocatalytic testing under visible-light show that the forbidden band widths narrowed and the photocatalytic activities improved significantly after the load of Ag. Moreover, the location of loaded-Ag has great effect on the photocatalytic activity of TiO 2 @Y 2 O 3 hollow microspheres. Compared with Ag located on the surface of the hollow microspheres, Ag located between the two shells of the hollow microspheres improved their photocatalytic activity more effectively.
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ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Lingxia Zheng,Xiaoying Ye,Xiaolei Deng,Yongzhi Wang,Yijian Zhao,Xiaowei Shi,Huajun Zheng
Photon absorption, charge separation and transportation, and charge-induced reactions at the active sites are the main crucial factors involved in the photoelectrochemical (PEC) water splitting. Herein, a combination of black phosphorus quantum dot (BPQD) sensitization and defect engineering strategies is employed to optimize the PEC performance of one-dimensional TiO2 nanotube array (NTA) photoanodes. The as-prepared TiO2–x/BP electrode exhibits a strong photocurrent density under simulated solar light irradiation, which is almost ∼3 times higher than that of bare TiO2. Specifically, the photocurrent increment of TiO2–x/BP is even larger than the sum of TiO2–x and TiO2/BP, verifying the synergistic effect of oxygen vacancies and BPQD sensitization. The maximum photoconversion efficiency of TiO2–x/BP is as high as 0.35%, while the value of TiO2 NTAs is calculated to be 0.13%. The results reveal that oxygen vacancies and BPQDs in the TiO2–x/BP composite not only facilitate the charge separation and transportation but also enhance the activity and quantity of reactive sites for water oxidation. The present strategy might open new routes to develop high-performance photoelectrodes for water splitting.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yanming Yang,Ming Liu,Shitong Han,Hailing Xi,Chao Xu,Rusheng Yuan,Jinling Long,Zhaohui Li
TiO 2 spherical shells with both inner and outer surface modified by graphene have been successfully constructed through a stepwise loading method. This double-sided modification method greatly increases the contact area of the shell with graphene sheets, which is beneficial for graphene to separate more photoelectrons from both the inner and outer sides of the shell simultaneously. The results of photocatalytic reduction of CO 2 into CO indicate that the modification effects of inner and outer wall of TiO 2 shell by graphene seem to be relatively independent to each other. As a result, compared with the traditional single-sided modified samples, even these optimal ones, the loading of graphene on the other side of TiO 2 shell can still improve the photocatalytic reduction performance. Moreover, the optimal dosage of graphene on one side of shell surface is always maintained, without being affected by the graphene usage on the other side. This work indicates that the unique heterojunction obtained by graphene double-sided modification is advantageous to enhance the photocatalytic CO 2 reduction performance and expected to be extended to the construction of other photocatalysts.
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2021
·
IF 6.158
Fei Sun,Ting-Ting Li,Hai-Tao Ren,Bing-Chiuan Shiu,Hao-Kai Peng,Jia-Horng Lin,Ching-Wen Lou
Oil and organic pollutants removal becomes an efficient solution to dispose of industrial oily and textile dye wastewater. This study proposes a lotus leaf-like bionic nanofibrous membrane with underwater superoleophobic for highly efficient oil-water separation. Papillary structure of the bionic membrane is formed by electrospraying of PVDF and TiO 2 solutions on the surface of beaded-structure PVDF/TiO 2 membrane. Dopamine is then decorated on the resultant PVDF/TiO 2 membrane by in situ polymerization to be with hydrophilic-underwater oleophobic property for highly efficient oil-water separation. This bionic membrane has > 99 % oil-water separation efficiency, and high flux of 1389 ± 67 L m −2 h −1 . Its contact angle of underwater petroleum ether and dichlomethane reaches 155° and 152°, respectively. Moreover, it has excellent water transport capacity, photocatalytic property, as well as high separation efficiency and flux even after 5-cycle filtration. This bionic nanofibrous membrane will become a promising candidate in clean production, industrial oil/water separation, water purification and efficient liquid transmission.
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高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 151
·期 7
·2027-2037
·
IF 2.482
Fu Jiawei,Ma Wenwen,Guo Yu,Li Xiaonan,Wang Haiyu,Fu Chen,Zhang Hong
Abstract A new amphipathic lindqvist-type polyoxometalate-based TiO 2 nanofibres catalysts ( 50-DTA-MoO-TiO 2 NF , DTA = CH 3 (CH 2 ) 11 (CH 3 ) 3 N, MoO = Mo 6 O 19 2- , TiO 2 NF = TiO 2 nanofibres, the weight percentage of DTA-MoO was 50%) was obtained by electrospinning and applied in desulfurization of fuel. This catalyst presented outstanding desulfurization performance and reusability. Graphic Abstract
The amphipathic lindqvist-type polyoxometalate-based TiO 2 nanofibres were prepared successfully and examined as heterogeneous catalysts in removal of sulfur-containing compounds. At 333 K, 100% desulfurization efficiency of 500 ppm DBT model oil was achieved using 0.010 g 50-DTA-MoO-TiO 2 NF as catalyst in 40 min with O/S molar ratio of 2:1 in ECODS.
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高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2020
·
IF 4.706
Nan Zhang,Feng Li,Yanyang Yin,Jing Han,Xin Li,Caixia Liu,Jingran Zhou,Shanpeng Wen,Samira Adimi,Yu Chen,Xin Song,Shengping Ruan
WO 3 -TiO 2 heterostructural nanofibers (HNFs) were prepared by a simple two-step process. The structures, chemical constitutions and morphologies of the samples were characterized by various kinds of techniques, including XRD, XPS, EDX, SEM and TEM. The results suggested that WO 3 nanocubes with a size range of 80–120 nm were decorated uniformly on the surface of TiO 2 nanofibers in the WO 3 -TiO 2 samples. XPS results confirmed the existence of W 5+ and the increased amount of both chemisorbed oxygen species and oxygen vacancies after the WO 3 nanocubes were decorated on the surface of TiO 2 nanofibers. Compared with the pure materials, the WO 3 -TiO 2 HNFs exhibited higher response, better selectivity and lower limit detection to xylene. The improvement of the performance can be attributed to the formation of heterojunction between TiO 2 and WO 3 and the conversion between W 6+ and W 5+ . The sensing mechanism of the enhanced gas sensing properties was also discussed.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Xinyu Wang,Yuhan Yao,Wei Gao,Zhaolin Zhan
TiO 2 is exceptionally useful anode material for Li-ion batteries, and the ability to modify TiO 2 makes it a very attractive and challenging research object for use in different functional materials . In this paper, mesoporous TiO 2 nano hollow spheres (dubbed TiO 2 -1 andTiO 2 -2) with moderate oxygen vacancies were successfully prepared. Structure and composition characterizations revealed that the spheres had a hollow structure, surface oxygen vacancies and an excellent Ti 3+ /Ti 4+ molar ratio of 0.181. In addition, TiO 2 -2 demonstrated synergistic effects in terms of electron and lithium ion transportation, with impedances as low as 3.05 Ω, and its Li-ion diffusion coefficient (7.8 × 10 −12 cm 2 s −1 ) was at least a factor of 10 larger than that of TiO 2 -1(6.2 × 10 −13 cm 2 s −1 ). More importantly, experiments demonstrated that the well-balanced Li + /e − transportation arising from the synergetic effect between structure and Ti 3+ /oxygen vacancy in the optimal TiO 2 -2 sample had a high specific capacity of 233 mAh·g −1 at 0.1C, and 79.8% capacity retention after 100 cycles, as well as greatly enhanced rate performance and electrochemical reactivity and stability in comparison with the other TiO 2 . Our method for creating oxygen vacancies in TiO 2 nano hollow spheres can be generalized to other electrochemical energy storage materials .
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 12
·1-10
·
IF 2.132
Zhang Sainan,Feng Min,Liu Ying,Wang Daoai
Ta 2 O 5 -TiO 2 heterojunction photocatalysts with a structure of TiO 2 nanodots deposited on Ta 2 O 5 nanotube (NTs) were prepared by anodization and in situ growth methods following annealing treatment. The heterojunction photocatalytic material exhibited enhanced photodegradation behavior of methylene blue (MB) and photoelectrochemical water splitting performance under simulated solar light. The degradation rate of MB and photocurrent density of heterojunction is 3.99 and 8.33 times higher than that of pure Ta 2 O 5 NTs respectively. The synergetic effect of the phase heterojunction and highly ordered structure increased the specific surface area and improved the separation and transmission efficiency of photogenerated electrons and holes, thereby enhancing the photocatalytic activities. Hence, Ta 2 O 5 TNs-TiO 2 nanodots heterojunction has promising application in the fields of photodegradation, photoelectrochemical water splitting, solar cells, and other photocatalytic devices. Graphical abstract
The heterojunction photocatalytic material exhibits enhanced photodegradation behavior of methylene blue (MB) and photoelectrochemical water splitting performance under simulated solar light. The degradation rate of MB is 3.17and 3.99 times higher than that of pure TiO 2 NTs and Ta 2 O 5 NTs, respectively; the photocurrent density increases by 8.33 times and 1.6 times compared with pure Ta 2 O 5 NTs and TiO 2 , respectively.
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