NANOTECHNOLOGY
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2019
·Vol. 31
·期 8
·085603
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IF 3.399
Jianxun Zhao,Juanjuan Yin,Jinling Zhong,Tifeng Jiao,Zhenhua Bai,Sufeng Wang,Lexin Zhang,Qiuming Peng
The catalytic reduction of nitro compounds is currently a hot research area, how to efficiently and stably degrade such toxic and harmful substances has become the research goal of many researchers. In this work, an Artemia cyst shell (ACS)–TiO2–MoS2 ternary porous structure was proposed and prepared as a catalyst for the reduction of 2-nitroaniline (2-NA) and 4-nitrophenol (4-NP). The ACS has a large number of porous structures, exhibits a good binding ability with TiO2 and MoS2, and provides a large number of active sites for the catalytic reduction process. The obtained composite material has a good reduction effect on 4-NP and 2-NA, with a good stability and recyclability, which is obviously higher than the reduction effect of ACS–TiO2 and MoS2 under the same conditions. This work provides ideas for the design of porous catalytic materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Mingliang Ma,Yuying Yang,Wenting Li,Yong Ma,Zhouyu Tong,Weibo Huang,Liu Chen,Guanglei Wu,Huanli Wang,Ping Lyu
Yolk-shell magnetic Fe 3 O 4 /P(MAA-MBAA)-PPy/Au/void/TiO 2 microspheres have been prepared as visible light active photocatalyst . In this structure, the Fe 3 O 4 /P(MAA-MBAA)-PPy core-shell support provides magnetic properties for the catalyst and a large number of binding sites for the Au nanoparticles . In addition, coupling TiO 2 with Au nanoparticles can extend the range of absorbable sunlight and enhance electron hole separation. The test of degrading rhodamine B (RhB) under simulated visible light was used to verify the photocatalytic activity of the photocatalyst. The results showed that the photocatalyst exhibited favorable catalytic properties within 90 min in the case of using 4 mg itself. The improved performances were ascribed to the unique yolk-shell structure, which on the one hand greatly improves the light utilization, on the other hand favors full contact of the dye because of the porous appearance of the outer shell. Furthermore, the existence of magnetic core was beneficial to the recycling of the photocatalyst. And the recycling results demonstrated that the catalyst efficiency was maintained at 70.2% even after six recycling experiments. This work not only displays a new material for the degradation of organic dyes, but also provides a new approach for the synthesis of yolk-shell structure photocatalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Fengyi Wang,Daheng Wang,Zhiguang Guo
Functional superamphiphobic coatings have garnered massive concern due to their promising application in oil transportation and anti-contamination, which call for the requirements of mechanical stability and flame retardancy. Herein, a novel superamphiphobic PVT/F-APP-TiO 2 hybrid coating with excellent mechanical stability and flame retardancy was fabricated using fluorinated PVT polymer adhesive and highly fluorinated ammonium polyphosphate/TiO 2 (F-APP-TiO 2 ) particles with hierarchical core-shell structure. The synthetic mechanism, surface structure, chemical composition of the F-APP-TiO 2 particles were investigated by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), respectively. The PVT/F-APP-TiO 2 coatings exhibited excellent superamphiphobicity, anticontamination and self-cleaning property. Good mechanical stability of PVT/F-APP-TiO 2 coatings was verified by mechical damage tests including sand paper abrasion, tape-peeling and water-impacting tests. Further, the PVT/F-APP-TiO 2 coatings showed excellent flame retardancy and self-recovery ability. The PVT/F-APP-TiO 2 coatings with versatile abilities exhibited promising potential to achieve numerous applications in water-oil proof, fireproof and oil transportation materials.
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ELECTROCHIMICA ACTA
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2019
·
IF 5.383
Rui Fang,Wei Xiao,Chang Miao,Ping Mei,Yan Zhang,Xuemin Yan,Yu Jiang
The core-shell structural N-doped carbon encapsulating Si@TiO 2 composite (Si@TiO 2 /NC) are prepared by facile sol-gel, polymerization of dopamine hydrochloride and the following heat treatment processes, which are confirmed by the scanning electron microscopy, X-ray diffractometer, transmission electron microscopy , X-ray photoelectron spectroscopy and thermogravimetric analyses. The as-prepared Si@TiO 2 /NC composite present favorable spherical shape with about 150 nm in diameter and uniform element distribution, and demonstrate the enhanced electrochemical properties compared to the pure silicon , Si@TiO 2 and Si/NC materials when the composite materials are used as anodes for lithium-ion batteries, in which the Si@TiO 2 /NC composite anodes display the favorable initial coulombic efficiency of 75.9%, remarkable charge specific capacity of 1070.9 mAh g −1 with the coulombic efficiency approaching 100% after 100 cycles under the test current of 200 mA g −1 , extraordinary rate and cycle capability with the charge specific capacity of 696.2 mAh g −1 under the test current of 3000 mA g −1 and increased lithium ion diffusion coefficient from 8.179 E-12 cm 2 s −1 to 8.995 E-12 cm 2 s −1 after 100 cycles. Those excellent electrochemical properties can be attributed to the synergistic effect of the robust TiO 2 skeleton and the elastic conductive N-doped carbon network, indicating the as-prepared Si@TiO 2 /NC composite could be a promising anode for lithium-ion batteries.
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BIOSENSORS & BIOELECTRONICS
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2018
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IF 8.173
Shengping Wen,Yu Su,Rong Wu,Shiwei Zhou,Qianhao Min,Gao-Chao Fan,Li-Ping Jiang,Rong-Bin Song,Jun-Jie Zhu
The accurate therapeutic evaluation for chronic myeloid leukemia (CML) drug is of great importance to minimize side effects and enhance efficacy. Herein, a facile and precise surface-enhanced scattering (SERS) approach based on coupled plasmonic field has been introduced to evaluate the therapeutic outcomes of antileukemia drug through ultrasensitive assay of caspase-3 activity in apoptotic cells. Caspase-3 as an apoptosis indicator could specifically cleave the N-terminus of biotinylated DEVD-peptide (biotin-Gly-Asp-Gly-Asp-Glu-Val-Asp-Gly-Cys) immobilized on the Au nanoparticle-decorated TiO 2 nanotube arrays (TiO 2 /Au NTAs) substrate. After the enzyme cleavage with caspase-3, Raman-labelled Au nanostar (AuNS) probes captured the residual DEVD-peptides via the recognition between streptavidin and biotin , thus resulting in an enhanced Raman response on the SERS platform. The variation of Raman intensity revealed caspase-3 activity that reflected the chemotherapeutic effect. On this platform, AuNS nanoprobes offered a large number of binding sites and intrinsic “hot spots” for Raman reporters, while TiO 2 /Au NTAs rendered a homogenously coupled electromagnetic field between the adjacent repeated units over the large area. In particular, a spatially expanding plasmonic field formed by coupling AuNSs with TiO 2 /Au NTAs would further heighten Raman enhancement. Taking these advantages, the strong and uniform Raman signals were achieved. Furthermore, the practicability investigation witnessed that the proposed SERS strategy was available to evaluate the therapeutic effect of dasatinib on CML K562 cells . The developed method possesses fascinating advantages of cost-effectiveness, excellent reproducibility and high sensitivity, which endows it with promising potential in apoptosis monitoring and anticancer drug development.
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NANOTECHNOLOGY
·
2018
·Vol. 29
·期 31
·315601
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IF 3.404
Gang Xiao,Shengnan Xu,Peifeng Li,Haijia Su
Heterostructured photocatalysts based on g-C3N4 and TiO2 represent a promising kind of photocatalyst in environmental fields, but the synthesis methods are always complex and not green. In the present paper, a facile and green one-step calcination procedure at lower temperature (450 °C) with the assistance of water is developed to synthesize a visible-light-active TiO2@g-C3N4 heterostructured photocatalyst, which shows higher visible-light-driven activity (k = 0.014 min−1) than pure g-C3N4 (k = 0.0036 min−1) and TiO2 (k = 0.0067 min−1) for methyl orange degradation. Excellent performance (over 90% conversion) was also observed for the removal of rhodamine B, phenol, and Cr(VI) under visible light. The heterostructured photocatalyst showed favorable reusability, preserving 86% of its activity after five successive cycles. A mechanism study demonstrates that the enhanced photocatalytic activity results from the efficient separation of the photo-generated charge carriers through the intimate interface between the two semiconductors based on their appropriate band structures and light-induced mechanism. The heterostructured photocatalyst will certainly find wide applications in the treatment of various toxic pollutants in wastewater using abundant solar energy. Furthermore, this facile and green procedure and the proposed synergistic mechanism will provide guidelines in designing other g-C3N4 based organic–inorganic composite photocatalysts for various applications.
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ACS Sustainable Chemistry & Engineering
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2018
·
IF 6.14
Lanhua Yi,Fujun Lan,Jinge Li,Caixian Zhao
Photocatalytic water splitting for H2 evolution is appealing for transforming solar energy into clean chemical fuel. This technique generally requires noble metals as H2 evolution cocatalysts to facilitate efficient cleavage of water. Herein, we report a noble-metal-free TiO2 nanobelts composite photocatalyst, in which TiO2 nanobelts are supported by nitrogen-doped graphene coordinated with a single Co atom (Co-NG). The results show that Co-NG is an efficient cocatalytst for the photocatalytic H2 production over TiO2. The optimal amount of Co-NG loading is found to be 3.5 wt %, showing a H2 evolution rate of 677.44 μmol h–1 g–1 under illumination of AM 1.5 G simulated sunlight, which is close to that of platinized TiO2 nanobelts and 2.6 and 31.2 times greater than that of 3.5 wt % NG/TiO2 nanobelts composite and pure TiO2 nanobelts, respectively. The significantly improved photocatalytic activity is ascribed to the remarkable synergistic effect between single-atom Co and N-doped graphene, which serve as effective H+ reduction sites and efficient electron acceptors, respectively. Besides, the Co-NG cocatalyst also effectively retards the recombination of photoinduced charge carriers and leads to a prolonged lifetime of charge pairs. This study reveals that Co-NG is an up-and-coming candidate as cocatalyst for development of cost-effective photocatalysts for efficient solar-driven H2 evolution.
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RSC Advances
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2018
·Vol. 8
·期 50
·28329-28340
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IF 2.936
Yongzhi Liu,Huaili Zheng,Yili Wang,Xinyu Zheng,Moxi Wang,Jie Ren,Chuanliang Zhao
In the face of complex water quality changes, the application of existing cationic polyacrylamide has been largely limited. In this study, a series of cationic polyacrylamides (TPADs) with excellent flocculation/dewatering performance and low dosage were synthesized through photocatalytic surface initiation using acrylamide (AM) and acryloyloxyethyl trimethylammonium chloride (DAC) as monomers and nano-TiO2 as an initiator. Characterization using Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (1H NMR) spectroscopy, thermogravimetric/differential scanning calorimetry (TG/DSC) and scanning electron microscopy (SEM) was used to analyze the structural and morphological properties of TPADs. The initiation mechanism was described and the study on the properties of TPADs shows that the initiation method could obtain the copolymer with extra-high intrinsic viscosity. Furthermore, the flocculation and dewatering performance of TPADs and PADs were investigated in the micro-polluted low turbidity water flocculation test and sludge dewatering test. The application experimental results indicated that TPADs showed satisfactory turbidity removal and sludge dewatering performance by virtue of strong charge neutralization and a bridging effect. The excellent flocculation/dewatering performance was attributed to the photocatalytic surface-initiated method and the nano-TiO2 initiator. Therefore, it is expected to open up new initiation methods in the synthesis of polymeric flocculants for a broad variety of applications.
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Analytical Methods
·
2015
·Vol. 7
·期 7
·3277-3282
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IF 1.821
Qingxiang Zhou,Zhi Fang
Triazine herbicides are effective herbicides, which are widely used all over the world, but their residues pose a great threat to the environment and human health. Thus, it is crucial to develop a rapid and sensitive method for monitoring the triazine concentrations in the environment. The present study establishes a simple, sensitive and reliable method for determination of four triazine herbicides including atrazine, prometryn, propazine and simazine in water samples. Ordered titanium dioxide (TiO2) nanotube arrays were prepared using an anodization method and were then used as the adsorbent in the development of a micro-solid phase extraction for the enrichment of triazine herbicides before analysis using high performance liquid chromatography. The experimental results demonstrated that TiO2 nanotube arrays showed good adsorption of triazine herbicides, and the proposed method had satisfactory sensitivity with limits of detection in the range of 0.19–0.50 μg L−1. The proposed method was validated using four real environmental water samples and spiked recoveries were in the range of 84.3–101.9%. All the results demonstrated that the proposed method was an effective analytical tool and would be a useful method for the determination of such pollutants.
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JOURNAL OF POWER SOURCES
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2014
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IF 5.211
Weiya Chen,Yanbo Liu,Ying Ma,Wenxiu Yang
Functionalized TiO 2 (f-TiO 2 ) was synthesized by the atom transfer radical polymerization process and then three types of composite nanofiber membranes including PI/PVdF-HFP (PI/PH, with no nanoparticles contained in PI), TiO 2 @PI/PVdF-HFP (T@PI/PH, with TiO 2 mixed in PI) and f-TiO 2 @PI/PVdF-HFP (f-T@PI/PH, with f-TiO 2 blended in PI) were prepared by bicomponent co-electrospinning technique which could separately maintain the original properties of both PVdF-HFP and PI nanofibers. UV–vis characterization manifested that the modified nanoparticles can provide significant improvements in reducing the particle agglomeration . Morphology, porosity, electrolyte uptake and liquid electrolyte contact angle of all the electrospun separators were investigated, and results showed that the composite separator with 2% f-TiO 2 nanoparticle had smaller fiber diameter , higher porosity, larger electrolyte uptake, smaller contact angle and more excellent thermal dimensional stability. More importantly, the tensile strength of all the composite membranes increased by more than three times after thermal calendering process, which resulted from the several bonded points caused by the fusion of PVdF-HFP component with low melting temperature. Additionally, electrochemical properties of PI/PH, 2% T@PI/PH and 2% f-T@PI/PH composite separators and cycling performances of corresponding batteries were evaluated and 2% f-T@PI/PH composite separator showed better properties than the other two.
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RSC Advances
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2017
·Vol. 7
·期 54
·34096-34103
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IF 3.108
Yuehan Su,Ping Chen,Fengliang Wang,Qianxin Zhang,Tiansheng Chen,Yingfei Wang,Kun Yao,Wenying Lv,Guoguang Liu
A novel visible-light-driven carbon dot (CDs)/TiO2/g-C3N4 photocatalyst was successfully synthesized by doping CDs in TiO2 nanoparticles and the surface of g-C3N4 nanosheets via a facile hydrothermal process and was confirmed by characterization methods. UV-vis diffuse reflectance spectra (DRS) revealed that CDs/TiO2/g-C3N4 showed obvious additional absorption in the 370–450 nm region. DMPO spin-trapping ESR spectra demonstrated the existence of O2˙− and ·OH. The photocatalytic activity of the CDs (1.0 wt%)/TiO2/g-C3N4 was remarkably enhanced as compared to that of the single components (TiO2 and g-C3N4) and double component (TiO2/g-C3N4) towards the degradation of enrofloxacin (ENX) under visible-light irradiation. About 91.6% of ENX was decomposed by CDs (1.0 wt%)/TiO2/g-C3N4 in 1 h, which is nearly 3.95 times, 4.82 times, and 1.69 times that for TiO2, g-C3N4, and TiO2 (90.0 wt%)/g-C3N4, respectively. Scavenging experiments revealed that O2˙− and ·OH played key roles during the photocatalytic degradation of ENX. This study provides a simple and convenient method to modify materials with enhanced photocatalytic performance, and the CDs/TiO2/g-C3N4 catalyst is efficient, stable, and reusable for environmental practical applications.
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JOURNAL OF HAZARDOUS MATERIALS
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2016
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IF 4.836
Wen-Yuan Yan,Qi Zhou,Xing Chen,Yong Yang,Yong Zhang,Xing-Jiu Huang,Yu-Cheng Wu
Photocatalytic degradation is one of the most promising methods for removal of fulvic acids (FA), which is a typical category of natural organic contamination in groundwater. In this paper, TiO 2 /graphene nanocomposites (N-RGO/TiO 2 ) were prepared via simple chemical functionalization and one-step hydrothermal method for efficient photodegradation of FA under illumination of a xenon lamp as light source. Here, p -phenylenediamine was used as not only the linkage chemical agent between TiO 2 nanocrystals and graphene, but also the nitrogen dopant for TiO 2 nanocrystals and graphene. During the hydrothermal process, facets of TiO 2 nanocrystals were modulated with addition of HF, and sizes of TiO 2 nanocrystals were controlled by the contents of graphene oxide functionalized with p -phenylenediamine (RGO-NH 2 ). The obtained N-RGO/TiO 2 nanocomposites exhibited a much higher photocatalytic activity and stability for degradation of methyl blue (MB) and FA compared with other TiO 2 samples under xenon lamp irradiation. For the third cycle, the 10wt%N-RGO/TiO 2 catalyst maintains high photoactivity (87%) for the degradation of FA, which is much better than the TiO 2 -N/F (61%) in 3 h. This approach supplies a new strategy to design and synthesize metal oxide and graphene oxide nanocomposites with highly efficient photocatalytic performance.
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