FUEL
·
2023
·
IF 7.4
Rihong Xiao,Yili Zhang,Zhuo Xiong,Junying Zhang,Yongchun Zhao
Photocatalytic technology has the advantages of environmental friendliness, low energy consumption, and fast reaction speed, which can be applied in the field of visible light mercury removal. High stability and narrow bandgap are fundamental factors for ideal semiconductor photocatalysts. A novel method of hydrothermal synthesis of CQDs/2D-BWO composite catalyst to improve the oxidation efficiency of elemental mercury was proposed. The morphology, physicochemical properties, and optical performance of the materials were fully characterized. The experiment of Hg oxidation efficiency under visible light showed that C 2 /2D-BWO exhibited a Hg removal efficiency of was as high as 86.3 % under visible light and adequate cyclic stability. The effects of SO 2 and NO on Hg oxidation were also studied, and the reasons for the improved of photocatalytic activity of CQDs on 2D-BWO were analyzed based on DFT calculations. The reaction mechanism of the catalytic oxidation of Hg by C 2 /2D-BWO was proposed, and C 2 /2D-BWO was found to be an efficient and stable visible light catalyst.
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LANGMUIR
·
2015
·
IF 4.457
Ruidong Cheng,Min Tian,Sujuan Sun,Chenghui Liu,Youpeng Wang,Zhaotie Liu,Zhongwen Liu,Jinqiang Jiang
The amphiphilic random copolymer of P(NVP-co-NHPSS) with photocleavable N–O sulfonate side groups has been prepared to investigate the light-triggered disruption of copolymer micelles. Methods of absorption and emission spectra, solution transmittance, dynamic light scattering (DLS), and transmission electron microscopy (TEM) were applied. It was found that P(NVP-co-NHPSS) could form polymeric nanoaggregates in aqueous solution. And the photocleavage of the N–O bond within copolymer micelles upon 365 nm UV light could be conveniently controlled by changing the irradiation intensity, leading to the disruption of copolymer micelles and the photocontrolled release of Nile red encapsulation. And by encapsulating NaLuF4:Gd/Yb/Tm UCNPs inside copolymer micelles, the response of the photocleavable N–O bond to the 980 nm laser was much weaker than the response to 365 nm light; however, the photocontrolled release of Nile red could still be effectively triggered by the NIR light of the 980 nm laser.
研究领域:
材料科学
·
化学
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高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2015
·Vol. 29
·期 9
·618-623
·
IF 2.248
Hongxu Guo,Di Guo,Zishan Zheng,Wen Weng,Jianhua Chen
Ag nanoparticle (NP)-decorated MIL-125(Ti) microspheres (Ag@MIL-125(Ti)) were firstly fabricated via a facile hydrothermal and following photo-reduction method. The photocatalysts were characterized using X-ray diffraction, scanning and transmission electron microscopies, X-ray photoelectron spectroscopy and UV–visible diffuse reflectance spectroscopy. The characterization results indicated that Ag NPs were dispersed on the surface of MIL-125(Ti) microspheres, and the Ag NPs had a uniform diameter of about 40 nm. The composites exhibited excellent visible-light absorption, due to the modification with the Ag NPs. The photocatalytic activity for the visible-light-promoted degradation of Rhodamine B was improved through the optimization of the amount of Ag loaded as a co-catalyst, this amount being determined as 3 wt%. Additionally, studies performed using radical scavengers indicated that O 2 − and e − served as the main reactive species. The catalyst can be reused at least five times without significant loss of its catalytic activity. Furthermore, a photocatalytic mechanism for degradation of organics over Ag@MIL-125(Ti) is also proposed. Copyright © 2015 John Wiley & Sons, Ltd.
研究领域:
材料科学
·
环境科学
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Acta Biomaterialia
·
2015
·
IF 6.025
Kui Cheng,Yu Sun,Hongping Wan,Xiaozhao Wang,Wenjian Weng,Jun Lin,Huiming Wang
Anatase TiO 2 nanodot films have been found to be able to release cells under light illumination with excellent efficiency and safety. In the present study, we investigated the effects of rutile contents in TiO 2 nanodot films on such light induced cell detachment behavior. The results showed that TiO 2 nanodot films with different contents of rutile phase have been prepared successfully. The content of rutile phase increased with the increase in calcination temperature. All films possessed good cell adhesion but there was a decrease in cell proliferation with the increasing content of rutile phase. Single cell detachment assay showed that the films with high rutile contents (calcined at 900 °C and 1100 °C) showed better cell detachment performance. That was ascribed to the changes of the secondary structure of extracellular proteins adsorbed on the nanodot surface after ultraviolet (365 nm, UV365) illumination. In addition, cell sheets detached through UV365 illumination maintained high activity and could be further used in tissue engineering. The present work showed that the existence of rutile phase is helpful in cell detachment behavior and it could be utilized to optimize light-induced cell detachment behavior. Statement of Significance This work discovers that the presence of rutile phase in TiO 2 nanodot films could improve the light-induced cell detachment behavior, although rutile phase is inferior to anatase phase on light induced superhydrophilicity. That strongly supported that the behaviors of adsorbed proteins are crucial in acquiring cell sheet with light illumination. In fact, the state and behavior of adsorbed protein greatly affect the interaction between biomaterials and living cells. Therefore, we consider this work is not only important in harvesting cells or cell sheets through light illumination, but also helpful in further understanding of interaction between biomaterials and cells.
研究领域:
生物材料学
·
细胞生物学
·
组织工程学
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高影响因子
ACS Nano
·
2015
·
IF 12.881
Zhen Liu,Xianjun Liu,Yingda Du,Jinsong Ren,Xiaogang Qu
As an efficient route to control pet overpopulation and develop neutered experimental animals, male sterilization via surgical techniques, chemical injections, and antifertility vaccines has brought particular attention recently. However, these traditional ways usually induce long-term adverse reactions, immune suppression, and serious infection and pain. To overcome the above limitations, we developed a platform in the present study by using plasmonic copper sulfide nanocrystals (Cu2–xS NCs) as intelligent light-driven sterilants with ideal outcomes. Upon NIR laser irradiation, these well-prepared Cu2–xS NCs can possess NIR-induced hyperthermia and generate high levels of reactive oxygen species (ROS). Due to the cooperation of photothermal and photodynamic effects, these nanocrystals exhibited NIR-mediated toxicity toward Sertoli cells both in vitro and in vivo in a mild manner. We attribute the potential mechanism of cellular injury to the apoptosis-related death and denaturation of protein in the testicles. Furthermore, the possible metabolism route and long-term toxicity of these nanocrystals after testicular injection indicate their high biocompatibility. Taking together, our study on the NIR-induced toxicity of Cu2–xS NCs provides keen insights for the usage of plasmonic nanomaterials in biomedicine.
研究领域:
纳米技术
·
生物医学工程
·
生殖医学
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高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Shuanglong Ma,Sihui Zhan,Yanan Jia,Qixing Zhou
Fe3O4-TiO2 nanosheets (Fe3O4-TNS) were synthesized by means of lamellar reverse micelles and solvothermal method, which were characterized by TEM, XRD, XPS, BET, and magnetic property analysis. It can be found that Fe3O4-TNS nanosheets exhibited better photocatalytic antibacterial activity toward Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus than pure Fe3O4 and TNS, and the antibacterial efficiency could reach 87.2% and 93.7% toward E. coli and S. aureus with 100 μg/mL Fe3O4-TNS after 2 h of simulated solar light illumination, respectively. The photocatalytic destruction of bacteria was further confirmed by fluorescent-based cell live/dead test and SEM images. It was uncovered that Fe3O4-TNS inactivated G- E. coli and G+ S. aureus by different mechanisms: the destruction of outer membranes and ruptured cell bodies were responsible for the bactericidal effect against E. coli, while the antibacterial effect toward S. aureus were due to the fact that the cells were adsorbed in form of clusters by massive Fe3O4-TNS, which could restrict their activities and cause malfunction of the selective permeable barriers. Furthermore, the antibacterial mechanism was studied by employing scavengers to understand exact roles of different reactive species, indicating the key roles of h+ and H2O2. The recovery and reusability experiments indicated that Fe3O4-TNS still retained more than 90% bacteria removal efficiency even after five cycles. Considering the easy magnetic separation, bulk availability, and high antibacterial activity of Fe3O4-TNS, it is a promising candidate for cleaning the microbial contaminated water environment.
研究领域:
材料科学
·
环境科学
·
微生物学
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PubMed
高影响因子
Nanomaterials and Nanotechnology
·
2015
·
IF 0.857
Linfan Cui,Tifeng Jiao,Qingrui Zhang,Jingxin Zhou,Qiuming Peng
In this study, highly efficient silver halide (AgX)-based photocatalysts were successfully fabricated using a facile and template-free direct-precipitation method. AgX nanoparticles, which included silver chloride (AgCl), silver bromide (AgBr) and silver iodide (AgI), were synthesized using different potassium halides and silver acetate as reactive sources. The size distribution of the AgX nanoparticles was determined by the reaction time and ratio of the reagents, which were monitored by UV-vis spectra. The as-prepared AgX nanoparticles exhibited different photocatalytic properties. This shows the differences for the photodegradation of methyl orange and Congo red dyes. In addition, the AgCl nanoparticle-based photocatalyst exhibited the best photocatalytic property among all three types of AgX nanoparticles that are discussed in this study. Therefore, it is a good candidate for removing organic pollutants.
研究领域:
材料科学
·
环境科学
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Shenguang Ge,Linlin Liang,Feifei Lan,Yan Zhang,Yanhu Wang,Mei Yan,Jinghua Yu
The hybrids, N -aminobutyl- N -ethylisoluminol (ABEI), horseradish peroxidase (HRP) and cancer antigen 125 s antibody (Ab2) immobilized graphene oxide (GO), were prepared, which exhibited excellent chemiluminescence (CL) activity. The zinc oxide nanorods (ZNRs) grew on reduced graphene oxide (RGO) modified paper working electrode (ZNRs-RGO/PWE) via an in situ growth method. The deposition of CdS quantum dots (QDs) on ZNRs/RGO-PWE resulted in an enhanced excitation and photo-to-electric conversion efficiency. The ABEI-GO@HRP/Ab2CL system was employed as an internal excited light source. A photoelectrochemical (PEC) immunosensor based on CdS-sensitized ZNRs anchored RGO as the photoactive matrix and ABEI-GO@HRP/Ab2 as the CL labels was established for sensitive detection of cancer antigen 125 (CA 125). As a model, sandwich CA 125-antibody was taken as molecular reorganization elements on this sensor for the sensitive determination of CA 125 in the linear range from 5.0 × 10 −4 U/mL to 500 U/mL with a detection limit of 2.0 × 10 −4 U/mL. The specificity, reproducibility, and stability of this sensor were also investigated. This proposed method might be attractive for clinical and biomedical applications.
研究领域:
生物医学工程
·
分析化学
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高影响因子
ANALYTICAL SCIENCES
·
2016
·Vol. 32
·期 7
·757-762
·
IF 1.174
Wang Chengke,Chen Dan,Wang Qingqing,Wang Qiuxia
In this work, an aptasensor-based resonance light-scattering (RLS) method was developed for the sensitive and selective detection of acetamiprid. The ABA (acetamiprid binding aptamer)-stabilized gold nanoparticles (ABA-AuNPs) were used as a probe. Highly specific single-strand DNA (ssDNA, i.e , aptamers) that bind to acetamiprid with high affinity were employed to discriminate other pesticides, such as edifenphos, kanamycin, metribuzin et. al. The sensing approach is based on a specific interaction between acetamiprid and ABA. Aggregation of AuNPs was specifically induced by the desorption of the ABA from the surface of AuNPs, which caused the RLS signal intensity to be enhanced at 700 nm. The alteration of AuNPs’ aggregation has been successfully optimized by controlling several conditions. Under the optimal conditions, the RLS intensity changes ( I/I0 ) of AuNPs were linearly correlated with the acetamiprid concentration in the range of 0–100 nM. The detection limit is 1.2 nM (3σ). This method had also been used for acetamiprid detection in lake water samples.
研究领域:
分析化学
·
环境科学
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2013
·Vol. 97
·期 1
·267-274
·
IF 2.107
Jinxiu Wang,Xue Yang,Jing Chen,Jiangjun Xian,Sugang Meng,Yi Zheng,Yu Shao,Danzhen Li
In this study, pure Ag 4 V 2 O 7 was synthesized via hydrothermal method without surfactant at different temperatures (100°C, 120°C, and 140°C) and pH values (4 and 5) for the first time. Moreover, Ag 4 V 2 O 7 nanoparticles with homogeneous size distribution about 200–300 nm can be obtained by adding polyvinylpyrrolidone to the synthesis system. Effects of hydrothermal synthesis conditions on photophysical properties and photocatalytic activity of Ag 4 V 2 O 7 were investigated systematically. Ag 4 V 2 O 7 sample prepared at 120°C and pH = 4 had the optimal photocatalytic activity among these samples, which almost completely degraded 10 ppm Rhodamine B within 3 h under visible light irradiation (420 nm < λ < 800 nm). The degradation products were measured by liquid chromatography–mass spectroscopy. The active species involved in the degradation process were analyzed by means of adding active species scavengers, electron spin resonance techniques, and photoelectrochemical experiments. A possible mechanism for photocatalytic degradation of organic pollutants on Ag 4 V 2 O 7 photocatalyst was proposed and discussed preliminarily.
研究领域:
材料科学
·
环境科学
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Nature Catalysis
·
2023
·Vol. 6
·期 8
·666-675
·
IF 37.8
Zhang Haochen,Li Chunsong,Liu Wenxuan,Luo Guangsheng,Goddard William A.,Cheng Mu-Jeng,Xu Bingjun,Lu Qi
Light alkane activation under mild conditions remains a substantial challenge. Here we report an aqueous reaction system capable of selectively converting light alkanes into corresponding olefins and oxygenates at room temperature and ambient pressure using Cu powder as the catalyst and O 2 as the oxidant. In ethane activation, we achieved a combined production of ethylene and acetic acid at a rate of 2.27 mmol g Cu −1 h −1 , with a combined selectivity up to 97%. Propane is converted to propylene with a selectivity up to 94% and a production rate up to 1.83 mmol g Cu −1 h −1 , while methane is converted mainly to carbon dioxide, methanol and acetic acid. On the basis of catalytic experiments, isotopic labelling experiments, spectroscopic insights and density functional theory calculations, we put forward mechanistic understandings in which the C–H bond is activated by the surface oxide species generated during the oxidation process, forming alkyl groups as key reaction intermediates.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 34
·期 12
·2308547
·
IF 19
Qin Zhang,Yaping Zhao,Xiangqian Qin,Mingliang Li,Haoran Sun,Peng Zhou,Wenjing Feng,Yuqing Li,Jianxun Lu,Kebin Lin,Lei Shi,Zhanhua Wei
Metal halide perovskite light-emitting diodes (Pero-LEDs) have gained great attention due to their promising applications in lighting and displays. However, in their conventional three-layered sandwich structure, some undeserved carrier behaviors, such as imbalanced carrier injection, severe carrier loss, and unstable recombination zone, limit the device's performance. Herein, a four-layered design by inserting a nickel acetate (Ni(OAc) 2 ) interlayer between the emitter and hole-transport layer(HTL) to manage carrier behavior and improve radiative recombination efficiency is proposed. Specifically, the Ni(OAc) 2 interlayer is poorly conductive and can partially block the hole injection, making the hole-electron injection more balanced. And the Ni(OAc) 2 interlayer avoids the direct contact between the perovskite emitter and hole transporter, reducing the interfacial carrier quenching. Moreover, the Ni(OAc) 2 interlayer inhibits the electron-migrated recombination at the hole transporter interface, confining the carrier recombination zone in the emitter layer. As a result, the corresponding Pero-LEDs achieve a maximum external quantum efficiency ( EQE max ) of 24.6% with good reproducibility, showing an average EQE max of over 20%.
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