JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Chong Xu,Fan Yang,Bijian Deng,Sai Che,Wang Yang,Ge Zhang,Yankun Sun,Yongfeng Li
A novel photocatalyst of rGO-wrapped Ti 3 C 2 /TiO 2 nanowires ((Ti 3 C 2 /TiO 2 )@rGO) was successfully synthesized to remove hexavalent chromium (Cr(VI)) and Rhodamine B (RhB) from wastewater. Among the prepared photocatalysts, (Ti 3 C 2 /TiO 2 )@rGO-15 showed the highest photocatalytic activity in both single and mixed pollutant solutions. The excellent photocatalytic activity was ascribed to the enhanced separation efficiency of e - and h + resulted from the Schottky barrier established in (Ti 3 C 2 /TiO 2 )@rGO. Ti 3 C 2 gathered the stimulated electrons originated from TiO 2 and further transferred them to rGO , thus enhancing the separation efficiency of e - and h + . Furthermore, different scavengers were employed to determine the reactive species involved in the photocatalytic reaction system. This work may provide a promising way to promote the separation efficiency of e - and h + via appropriate incorporation of co-catalyst.
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高影响因子
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
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2021
·
IF 3.935
Xinying He,Han Cao,Xia Li,Yan Li,Yunqiu Yu
Lysophosphatidylcholine (LPC) was commonly known as a class of significant differential metabolites of high relevance with many diseases including psoriasis, of which the accurate determination is of great importance to diagnosis or prediction to many diseases. However, it is challenging and complicated because of the enormous biological sample complexity and impurities interference. In this study, we synthesized a magnetic nanocomposite MG@PD@TiO 2 and took advantage of the interactions of Lewis acid−base between the phosphate groups in LPCs and Ti ions on MG@PD@TiO 2 nanomaterials for selective separation and enrichment of LPCs from complex biological matrix. The solid-phase extraction sample pretreatment process by means of MG@PD@TiO 2 nanomaterials coupled with LC–MS/MS method was then applied to actual determination of six typical LPCs (LPC 10:0, 14:0, 16:0, 18:0, 18:1, 22:0) in human plasma. The extraction conditions were scientifically optimized by single-factor test (adsorbent amount, adsorption and desorption time, elution solvent type, eluant volume). Under the optimal conditions, the detection limits (LOD, S/N = 3) and quantification limits (LOQ, S/N = 10) were 1 and 5 ng/mL for LPC 10:0 and LPC 14:0, 0.02 and 0.1 ng/mL for LPC 16:0 and LPC 18:1, 0.05 and 0.2 ng/mL LPC 18:0 and LPC 22:0, respectively. The intra- and inter-day precisions were 3.82–12.60 % (n = 6) and 3.29–13.50 % (n = 6) respectively, the recoveries were in the range of 91.92–113.69 % and the stability of the analytes in the matrix performed well with RSDs≤15.51 %. Finally, the developed method was successfully applied to the accurate determination of six LPCs biomarkers of plasma in patients with psoriasis (n = 10) and control groups (n = 10).
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高影响因子
ACS Omega
·
2020
·
IF 2.87
Misbah Sehar Abbasi,Muhammad Sultan Irshad,Naila Arshad,Iftikhar Ahmed,Muhammad Idrees,Shafiq Ahmad,Zhou Wei,Mohamed Sharaf,Muhammad Dzulqarnain Al Firdausi
Leakage of current in oxide layers is the main issue for higher speed and denser resistive random-access memory. Defect engineering played a substantial role in meeting this challenge by doping or producing controlled interstitial defects or active sites. These controlled active sites enabled memory cells to form a stable and reproducible conduction filament following an electrochemical metallization model. In this study, a defect-abundant lime peel extract (LPE)-mediated anatase TiO2 thin film was fabricated using a simple hydrothermal route. The detailed structural and morphological analysis of the bioactive anatase TiO2-LPE thin film reveals the homogeneous growth of TiO2 flowers and distinct features in terms of controlled defects as compared to simple anatase TiO2. These interstitial defects (Ti+3 and Ti+4) behave as active sites for cation migrations along highly conductive K1+ ions because of the mediation of LPE. The defect-free surface reveals slight surface roughness (4.8 nm) that successfully minimizes leakage of current. The strategy enabled a reliable conductive bridge filament, which can replicate with no more electric degradation. The Ag/TiO2-LPE/FTO-based memory cell demonstrates reproducible bipolar resistive switching along with a high ON/OFF ratio (>105), excellent endurance (1.5 × 103 cycles), and long-term retention (105 s) without any electrical degradation. Furthermore, green-synthesized TiO2-LPE nanoparticles have shown superior antibacterial activity as compared to other green syntheses of different plants or fruits against the toxic microorganisms present in inorganic media.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Zulfiqar Ali,Yang-wen Wu,Yue Wu,Zulqarnain Arain,Ming-xin Xu,Qiang Lu,Heping Ma,Huan-yu Zhao
Lead (Pb) species are inescapable constituents of the flue gas from coal-fired power plants and other thermal devices, which can cause impeding effects on the selective catalytic reduction (SCR) reactions. Here, the poisoning effects of Pb on the V 2 O 5 -MoO 3 /TiO 2 type SCR catalyst were examined. The poisoned catalysts were prepared by the solid diffusion and incipient wetness impregnation (IWI) methods. The catalytic activity tests indicated that the Pb-doped catalyst prepared by the IWI method suffered a considerable drop in catalytic activity, while a slender influence was observed on the Pb-loaded catalysts prepared by solid diffusion method. Comprehensive characterizations and density functional theory (DFT) calculations were performed on the fresh and poisoned catalysts prepared by the IWI method to unveil the deactivation mechanism. The results showed that Pb species covered the active sites (V species) on the catalyst surface, resulted in the decrease in chemisorbed oxygen, hence reducing the surface acidities. The decrease in reducibility of the catalyst was an important factor for poisoning of the catalyst. Moreover, Pb species reacted with MoO 3 to form PbMoO 4 which agglomerated on the catalyst surface to further deactivate the catalyst.
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高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Kun Li,Yoann de Rancourt de Mimérand,Xiaoyun Jin,Jungang Yi,Jia Guo
Hybrid nanomaterials have been produced using a combination of core–shell synthesis, 3D printing, and plasma grafting. Metal oxides, that is, ZnO and TiO2, as well as iron-based metal organic frameworks (Fe-MOF) nanoparticles were grafted permanently onto the surface of 3D-printed fractal substrates via cold plasma discharge (CPD). The aim is to produce supported photocatalysts for the degradation of organic pollutants in water. Herein, different plasma grafting strategies are developed, namely direct (using core–shell prefunctionalization) and indirect grafting. Noticeably, the latter, using poly(vinylphosphonic acid) as an intermediate layer for self-assembly grafting, potentially opens the way for the functionalization of any polymeric surface by inorganic nanocompounds. This study mainly aims at giving insight into the plasma immobilization process, but also demonstrating the potential it offers in the domain of supported catalysis. The activity of the different hybrid materials has been assessed by monitoring the photodegradation of Rhodamine B dye (ZnO and TiO2) and the removal of Ciprofloxacin antibiotic (Fe-MOF). Also, the reusability of the hybrid photocatalysts has been demonstrated. Independently, it was found that modifying the surface of the metal oxide nanoparticles with organic coupling agents—aiming at their plasma-grafting immobilization on polymer supports—allowed enhancing their photodegradation efficiency up to 20%. Finally, a resin fractal support has been printed by liquid crystal diode-based SLA (stereolithography) and later surface-functionalized by Fe-MOF nanoparticles. This provides evidence to the possibility of using laser-based 3D printing technologies to produce supports with high surface area for the immobilization of catalysts by plasma grafting.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xiqiang Tian,Muhammad Zahid,Wang Sun,Yujun Zhu
TiO 2 with different morphology as supports can lead to different surface properties and catalytic activities of catalysts. Herein, we reported a novel facile evaporation-induced assisted hydrothermal approach to synthesize three-dimensional hierarchical structure TiO 2 assembled from needle flakes by using Brij-35 as the morphology-directing agent. The morphology of the prepared TiO 2 from flower-like (TiO 2 -FT), sea urchin-like (TiO 2 -SUT), to ball-like (TiO 2 -BT), as well as the size of needle flakes, were controlled by adjusting the amount of Brij-35. These TiO 2 supported palladium catalysts were facilely prepared using a green bio-reductive method with Catalpa Fruit extract as reducing agent, where they showed remarkable catalytic activity in selective hydrogenation of 4-nitrophenol by sodium borohydride. Especially, 1 wt%Pd/TiO 2 -SUT with sea urchin-like exhibited higher reaction rate constant (1.44 min −1 ) than 1 wt%Pd/TiO 2 -FT (1.08 min −1 ) and 1 wt%Pd/TiO 2 -BT (0.72 min −1 ). Furthermore, XRD, N 2 adsorption–desorption, SEM, TEM, CO-FTIR, XPS and CO chemisorption measurements were performed to study the effects of different surface morphologies on the surface properties of catalysts. It reveals that the high catalytic performance of 1 wt%Pd/TiO 2 -SUT can be attributed to its specific hierarchical structure and much higher surface area, improving the uniform dispersion of Pd nanoparticles on the support to expose extra active surface Pd atoms (Pd 0 species) over 1 wt%Pd/TiO 2 -SUT.
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高影响因子
RARE METALS
·
2021
·Vol. 41
·期 2
·650-662
·
IF 4.003
Guo Hua,Li Jun,Zou Xian-Rui,Wang Hong-Shui,Kang An,Zhou Huan,Li Ming-Jun,Zhao Xiao-Yan
Abstract Development of photocatalytic materials able to profit from the whole spectrum of sun for efficient organic pollution removal and bacterial elimination is a fascinating strategy in environmental engineering. In current work, GO-TiO 2 /(Ca,Y)F 2 :Tm,Yb, a full-spectrum composite photocatalyst, was prepared via hydrothermal processing with TiO 2 /(Ca,Y)F 2 :Tm,Yb particles deposited on the surface of graphene oxide (GO). The surface properties of GO-TiO 2 /(Ca,Y)F 2 :Tm,Yb were characterized using various characterization techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) surface area analyzer. Besides, ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy, electron spin resonance (ESR) and other methods were used to systematically explore the photocatalytic mechanism of GO enhancement of TiO 2 /(Ca,Y)F 2 :Tm,Yb. In photocatalytic degradation study, the degradation rate of methyl orange (MO) was improved by 40% when GO was added into the TiO 2 /(Ca,Y)F 2 :Tm,Yb system. In addition, the presence of GO also improves the antibacterial ability of TiO 2 /(Ca,Y)F 2 :Tm,Yb against Escherichia coli and Staphylococcus aureus . All results reveal high efficacy of GO-TiO 2 /(Ca,Y)F 2 :Tm,Yb under full spectrum light irradiation, in which (Ca,Y)F 2 :Tm,Yb and TiO 2 can improve its utilization of full spectrum sunlight, and GO can enhance adsorption ability of dye and electron–hole pair differentiation ability of TiO 2 /(Ca,Y)F 2 :Tm,Yb. Graphic abstract
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CHEMOSPHERE
·
2019
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IF 5.108
Fuyou Du,Lingshun Sun,Zhujun Huang,Zhengyi Chen,Zhigang Xu,Guihua Ruan,Chenxi Zhao
Electrospun reduced graphene oxide/TiO 2 /poly(acrylonitrile- co -maleic acid) composite nanofibers (E-spun RGO/TiO 2 /PANCMA NFs) were fabricated using electrospinning of the dispersive solution of PANCMA, GO and TiO 2 followed by post-chemical reduction. The obtained composite nanofibers were compressed in a dialyzer and then used to absorb and degrade malachite green (MG) and leucomalachite green (LMG) from aqueous solution. Compared to the E-spun TiO 2 /PANCMA and GO/TiO 2 /PANCMA NFs, the E-spun RGO/TiO 2 /PANCMA NFs exhibited higher adsorption capacity and photocatalytic degradation ability. Under optimized conditions, 90.6% of MG and 93.7% of LMG from 50 mL aqueous sample solution were adsorbed on the RGO/TiO 2 /PANMA NFs (3.0 mg fibers) in 2.0 min, and subsequent the 91.4% and 95.2% of MG and LMG adsorbed on the NFs were degradated in 60 min under UV irradiation, respectively. In addition, the E-spun RGO/TiO 2 /PANMA NFs exhibited good reusability and could be reused in multiple cycles of operations for adsorption and photocatalytic degradation of MG and LMG. This work demonstrated that the electrospun composite nanofibers are promising materials for removal of pollutants from environmental water samples.
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高影响因子
Materials
·
2019
·Vol. 12
·期 17
·2817
·
IF 2.972
Feng Zhan,Lei Xiong,Fang Liu,Chenying Li
In this study, we proposed a novel and facile method to modify the surface of TiO2nanoparticles and investigated the influence of the surface-modified TiO2nanoparticles as an additive in a polyurethane (PU) coating. The hyperbranched polymers (HBP) were grafted on the surface of TiO2nanoparticles via the thiol-yne click chemistry to reduce the aggregation of nanoparticles and increase the interaction between TiO2and polymer matrices. The grafting of HBP on the TiO2nanoparticles surface was investigated by means of X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), nuclear magnetic resonance (NMR) and thermogravimetry analysis (TGA). The thermal and mechanical properties of nanocomposite coatings containing various amounts of TiO2nanoparticles were measured by dynamic mechanical thermal (DMTA) and tensile strength measurement. Moreover, the surface structure and properties of the newly prepared nanocomposite coatings were examined. The experimental results demonstrate that the incorporation of the surface-modified TiO2nanoparticles can improve the mechanical and thermal properties of nanocomposite coatings. The results also reveal that the surface modification of TiO2with the HBP chains improves the nanoparticle dispersion, and the coating surface shows a lotus leaf-like microstructure. Thus, the functional nanocomposite coatings exhibit superhydrophobic properties, good photocatalytic depollution performance, and high stripping resistance.Keywords:TiO2;hyperbranched polymers;polyurethane;nanocomposite coatings;thiol-yne click chemistry;mechanical and thermal properties;superhydrophobic property
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Zhi Liu,Chong Chen,Jinchong Zhao,Lingzhi Yang,Kaian Sun,Lingyou Zeng,Yuan Pan,Yunqi Liu,Chenguang Liu
Selective catalytic reduction of NO by NH 3 (SCR) at low temperature usually considered to be the combination of NO oxidation and “Fast SCR” process. However, the NO oxidation mechanism and the role of NO 2 over “Fast SCR” process are controversial. Focusing on these problems, the in-deep studies were performed over the typical MnO x /TiO 2 catalysts. Combining in-situ DRIFT, TPD-MS and DFT calculation results, an integrated NO oxidation mechanism was proposed based on an “Nitro-assisted oxygen activation” concept where the activation and transformation of O 2 is linked with the transformation of nitro species. The O O bond of O 2 can be weakened by generating a variation of bidentate nitrates, which can promote the break of O O bond and the formation of NO 2 . The formation of the variation of bidentate nitrates was the rate-determining step over NO oxidation. Additionally, we further reveal that the crucial role of NO 2 over “Fast SCR” process lies in participating the hydrogen abstraction from coordinated NH 3 and promoting the production of NH 2 active species which can direct react with NO to generate N 2 and H 2 O. The removability of NO 2 can coupling the MnO 2 (NO oxidation active component) and TiO 2 support (“Fast SCR” active component) together. Our findings provide insight into the design and improvement of catalysts or reaction pathways over the low-temperature SCR process.
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高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 7
·1-9
·
IF 5.479
Qin Xiaofei,Geng Liping,Wang Qianqian,Wang Yan
A photoelectrochemical (PEC) method is described for aptamer-based detection of ofloxacin (OFL). It is making use of a TiO 2 nanotube array (NTA) that is sensitized with a structure composed of polydopamine and silver sulfide nanoparticles. The NTA were prepared by a two-step synthetic method. First, the TiO 2 nanotube electrode was covered with Ag 2 S nanoparticles via successive ionic layer adsorption and reaction strategy. Next, they were coated with a thin film of polydopamine (PDA) by in-situ polymerization. The inorganic/organic nanocomposites exhibit distinctly enhanced visible-light PEC activity. This was exploited to fabricate a PEC aptasensor. The PDA film serves as both the sensitizer for charge separation and as a support to bind the aptamer against OFL. The aptasensor undergoes a decrease in photocurrent due to the formation of the aptamer-OFL complex. Under the optimized conditions and at a typical working potential of 0 V (vs. Hg/Hg 2 Cl 2 ), the NTA has a linear response in the 5.0 pM to 100 nM OFL concentration range and a 0.75 pM detection limit (at S/ N = 3). The aptasensor was successfully applied to the determination of OFL in spiked milk samples.
Schematic illustration for the preparation and mechanism of the photoelectrochemical aptasensor for ofloxacin. TiO 2 NTs: TiO 2 nanotube arrays; PDA: polydopamine; MCH: 6-mercapto-1-hexanol; OFL: ofloxacin; PEC: photoelectrochemistry; CB: conduction band; VB: valence band; LUMO: the lowest unoccupied molecular orbital; HOMO: the highest occupied molecular orbital; AA: ascorbic acid.
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Huiqin An,Min Li,Wei Wang,Zhaotao Lv,Congying Deng,Jingyuan Huang,Zhen Yin
The novel ternary reduced graphene oxide/1D TiO 2 nanotubes/3D ZnIn 2 S 4 microspheres (rGO/TiO 2 /ZIS) heterostructured photocatalyst with high-efficiency H 2 production capacity under visible light illumination is designed and prepared in this work. In rGO/TiO 2 /ZIS system, the 1D TiO 2 nanotubes are tightly inserted in the interspace of flower-like ZnIn 2 S 4 microspheres, which are further covered by rGO, leading to an intimate contact among ZnIn 2 S 4 , TiO 2 and rGO. The exquisite design of rGO/TiO 2 /ZIS makes it possess remarkable superiority in photocatalysis . Firstly, the unique 3D microsphere structure of ZIS increases the surface area and visible light absorption ability caused by their unique hollow structure. More importantly, the matched CB and VB positions between ZIS and TiO 2 contribute to separate photogenerated holes and electrons of ZIS efficiently under visible light; then, the separated electrons on TiO 2 are further transferred to rGO due to the superior-strong electron-attracting ability of rGO. At last, the thoroughly suppressing recombination of photogenerated holes and electrons is achieved by the mutually-reinforcing synergy among ZIS, TiO 2 and rGO, and thus the hydrogen generation capacity of ZIS is significantly enhanced. The H 2 production amount and rate of rGO/TiO 2 /ZIS (2.0 wt% rGO and 50 wt% ZIS) after 10 h are 4623 μmol/g and 462.3 μmol/g/h, respectively, which is 71.1 times of pristine TiO 2 and 1.6 times of ZIS under the same condition. The apparent quantum yield of rGO/TiO 2 /ZIS (2.0 wt% rGO and 50 wt% ZIS) in 10 h is about 0.6888%. This excellent photocatalytic performance is ascribed to the mutually-reinforcing synergy among ZIS, TiO 2 and rGO, which can be confirmed by X-ray photoelectron spectroscopy, photoelectrochemical measurements and photoluminescence spectrum. Based on the photocatalytic and characterization results, the corresponding mechanism is proposed.
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危险品化学品经营许可证（带存储）