Environmental Science-Nano
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2020
·Vol. 7
·期 9
·2654-2668
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IF 7.683
Wei Li,Xiao-shan Chu,Shu-ao He,Xue-chuan Wang,Chuan-yi Wang
Tetracycline hydrochloride (TTC), a typical antibiotic with biological toxicity, is very harmful to the ecosystem. Photocatalysis is considered an effective method for solving this problem. However, traditional photocatalysts have limited light response, poor charge transport, and low adsorption ability, which substantially limit their application. Herein, gourd-like hollow mesoporous silica (HS) particles with considerable BET surface area (1181.57 m2 g−1) and enhanced light absorption were constructed to support the Ag/AgBr Schottky junction. Photoelectrochemical characterizations confirmed that the optical response and charge transfer of the fabricated photocatalysts were significantly elevated because the synergistic effect of the Ag/AgBr Schottky junction and amino-modified gourd-like HS particles facilitated the effective generation of ˙OH radicals. The optimal HS-Ag/AgBr (40 wt% HSAA) exhibited highest TTC degradation activity (3.79 × 10−2 min−1) owing to a redox reaction with O2˙−/˙OH radicals, which was about 28.3-fold greater than the commercial P25 (1.34 × 10−3 min−1) and 12.8-fold greater than the AgBr (2.96 × 10−3 min−1). Most importantly, about 72.04%/81.17% of TTC was mineralized by optimal 40 wt% HSAA after 90 min/150 min of illumination, which was higher than those with P25 and other Ag/AgBr-based photocatalysts reported in the literature. Therefore, TTC and its by-products could be completely decomposed by this novel structure, and this study provides a prospective approach for the effective handling of antibiotic pollution in the ecosystem.
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MATERIALS & DESIGN
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2020
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IF 6.289
Changjiang Pan,Tingting Liu,Ya Yang,Tao Liu,Zhihao Gong,Yanchun Wei,Li Quan,Zhongmei Yang,Sen Liu
Osteogenic and antibacterial activities are two basic requirements for orthopedic implants. The present study mainly focused on the investigation of the osteoblast behaviors and antibacterial activities of Sr/Ag-incorporated titanium dioxide (TiO 2 ) nanotube array (TNT) on the titanium surface. To this end, the Sr-incorporated TNT was firstly fabricated on the titanium surface by electrochemical anodization and hydrothermal treatment, and then Ag nanoparticles (AgNPs) were incorporated onto the nanotubes by reduction of the adsorbed Ag + through ultraviolet (UV) irradiation. The TiO 2 nanotubes had excellent hydrophilicity and Sr incorporation can further enhance the hydrophilicity; however, the AgNPs loading could slightly increase water contact angle. The release of Sr 2+ can not only promote osteoblast adhesion, proliferation and mineralization, but also up-regulate the alkaline phosphatase (ALP) and osteocalcin (OCN) expression. The introduction of AgNPs on Sr-incorporated nanotubes did not significantly influence the osteoblast cell behaviors; however, it can effectively inhibit the adhesion and growth of Escherichia coli . Therefore, the method of the present study is expected to be suitable for surface modification of titanium surface to simultaneously enhance the osteo-bonding ability and antibacterial activities for bone repair.
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APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Jinhui Yang,Xiaogang Luo
Photocatalytic degradation is a promising method to solve the problem of ceftriaxone sodium wastewater. In this paper, Ag/TiO 2 @C composite materials with different Ag molar contents, where cellulose-derived carbon beads used as the carrier, were successfully prepared by the One-Pot method. In Ag/TiO 2 @C composite photocatalyst, Ag nanoparticles were deposited on TiO 2 particles to form a metal-semiconductor structure, where charge carriers were effectively separated under the Surface Plasmon Resonance effect of Ag nanoparticles, thereby extending the lifetime of charge carriers. Ag/TiO 2 @C has been found of higher photocatalytic degradation performance compared to pure TiO 2 and pure carbon beads. Among all, Ag (0.5%)/TiO 2 @C has the best catalytic performance. According to the Langmuir-Hinshelwood model, the photodegradation rate followed first-order kinetics, with the highest apparent rate of 0.0091 min −1 . According to the results of mass spectrometry, ceftriaxone sodium was degraded into small molecules and eventually degraded into CO 2 , H 2 O, and we proposed possible pathways and photocatalytic mechanism accordingly.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Xin-Yue Wang,Jie Yang,Ling Zhou,Gao Song,Fan Lu,Li-Jun You,Ju-Mei Li
It is greatly significant to sense hexavalent chromium (Cr (VI)) in water because Cr (VI) is one of the most toxic heavy metals and is extremely harmful for human health and environment. In this study, we explored sensitive surface-enhanced Raman scattering (SERS) substrates for rapid detection of Cr (VI) using magnetic Fe 3 O 4 /ZrO 2 /Ag composite microspheres. We firstly coated uniform zirconium dioxide layer around Fe 3 O 4 cores to achieve Fe 3 O 4 /ZrO 2 microspheres and then deposited silver nanoparticles onto their surface via controlled reduction of AgNO 3 by n-butylamine. The SERS sensitivity of Fe 3 O 4 /ZrO 2 /Ag composite microspheres were easily tailored via facilely changing the concentration of AgNO 3 to tune the coverage of silver nanoparticles on the Fe 3 O 4 /ZrO 2 /Ag. We used 4-mercaptobenzoic acid (4-MBA) as a Raman molecule to evaluate the SERS activity of Fe 3 O 4 /ZrO 2 /Ag. They illustrated excellent SERS property as well as magnetic responsibility. The optimized Fe 3 O 4 /ZrO 2 /Ag were employed to quantitatively detect Cr (VI) in aqueous solution. The results showed good linear relationship between SERS intensities and logarithm concentrations of Cr (VI) (R 2 = 0.98) with a detection limit of low down to 10 −7 M, which is much lower than the safety value (1 μM) in drinking water of United States Environmental Protection Agency. Moreover, the highly uniform and robust Fe 3 O 4 /ZrO 2 /Ag composite microspheres display outstanding signal reproducibility (RSD = 8.34 %) and good storage stability. These results indicate that the prepared Fe 3 O 4 /ZrO 2 /Ag composite microspheres have promising application prospect for SERS analysis of environmental pollutants.
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ANALYTICA CHIMICA ACTA
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2020
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IF 5.977
Yuehua Guo,Qihang Cao,Qiumei Feng
The detection of a small number of exosomes provides the possibility for early cancer diagnosis and prognosis. Here, a multi-signal amplified electrochemical sensing platform was explored for the ultrasensitive detection of tumor exosomes relying on catalytic hairpin assembly-triggered DNA walker, entropy beacon-based DNA assembly and Ag@C core-shell nanocomposites. In this work, the utilization of Ag@C nanocomposites as electrode interface effectively enhanced functional active sites and electron transfer capability. By designing a target-assisted entropy beacon-based DNA assembly, single exosome initiated the release of multiple special DNA sequences , which could be separated conveniently by magnet and then hybridize with the blocking DNA to liberate swing arm. DNA walker was activated with the assistance of catalytic hairpin assembly, introducing extensive electroactive methylene blue (MB) to electrode surface. Thus, the detection of exosomes was transferred into the measurement of the MB current, with a good liner range from 100 to 75 000 particles/μL. Furthermore, this constructed sensing system displayed acceptable reproducibility, long-term stability, favorable selectivity , and highlighting application potential in real samples.
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ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Yingzhou Tao,Yisheng Lin,Fang Luo,Caili Fu,Cuiying Lin,Yu He,Zongwei Cai,Bin Qiu,Zhenyu Lin
Hydrogen sulfide (H 2 S), as a hazardous gas, is often found around dump areas. Long term exposure can cause harm to health, it is highly necessary to develop some simple and sensitive methods for on-site H 2 S detection. Herein, a convenient photothermal assay has been designed for the quantitation of H 2 S using a handheld thermometer as readout. Au@Ag nanocubes (Au@Ag NCs), a core-shell nanocomposite with strong light absorption at ∼450 nm, was chosen as a novel photothermal agent in this study. Under the laser irradiation at 450 nm, the Au@Ag NCs show a strong photothermal effect, and a significant temperature enhancement can be measured by the thermometer easily. The presence of H 2 S can lead to the deposition of sulfur onto Au@Ag NCs, altering the localized surface plasmon resonance absorption, size, surface composition, and morphology of Au@Ag NCs and hence leading to the reduction of photothermal effect. The change of the temperature has a linear relationship with the H 2 S concentration in the range of 0.5–80.0 μM with a detection limit of 0.35 μM. By combining with simple sample purification procedures, the developed method has been applied to detect H 2 S in garbage odor gas with satisfactory results.
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ANALYTICAL CHEMISTRY
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2020
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IF 6.785
Yamin Nie,Xiuli Tao,Ying Zhou,Xiaoding Yuan,Ying Zhuo,Ya-qin Chai,Ruo Yuan
Metal nanoclusters (NCs) have attracted extensive interest in electrochemiluminescence (ECL) field, but it is still a significant challenge to prepare high ECL efficiency NCs, which tremendously precludes their application in sensing and imaging. Herein, we report poly(3,4-ethylenedioxythiophene) (PEDOT) as a functional ligand for NCs with a “kill three birds with one stone” role, acting as a stabilizer like existing templates, excitingly, excellent electrical conductivity to accelerate the injection of interfacial electrons, and outstanding electrocatalytic activity toward coreactants (S2O82–), which breaks the convention that traditional ligands act as a double-edged sword in ECL field. As an illustration, PEDOT-hosted Ag NCs were prepared with an unprecedented ECL intensity with S2O82– as a cathodic coreactant, which indicates that this novel ligand strategy will bring exciting opportunities, not only in opening up new horizons for rational development of high ECL efficiency metal NCs but also in advancing their potential applications in light-emitting devices and clinical biosensing. As a proof of concept, the PEDOT-hosted Ag NCs were applied as neoteric ECL emitters to achieve sensitive detection of dopamine (DA), which showcased a wide linear response from 1 nM to 10 mM and a low detection limit of 0.17 nM.
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SURFACE & COATINGS TECHNOLOGY
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2020
·
IF 3.784
Huang Di,Lin Qiaoxia,Zhou Yujie,Li Jingxuan,Wei Yan,Hu Yinchun,Lian Xiaojie,Chen Song,Chen Weiyi
Implant infections caused by bacteria and oxidative stress induced by reactive oxygen species (ROS) would seriously hinder the osseointegration at the interface of bone and titanium (Ti) implant, leading to a failure. Therefore, it is highly desirable to develop an implant surface modification with antibacterial and antioxidant functions. Silver (Ag), which exhibit a broad spectrum of antibacterial properties, was used in this work. Tannic acid (TA) was selected as the reducing agent to realize the generation of Ag nanoparticles , and as an antioxidant to achieve the antioxidative activity of Ti implants. So, a layer of anatase titanium dioxide (TiO 2 ) nanotubes with a diameter of 138.72 ± 14.02 nm was formed on the surface of Ti substrate by anodization and annealing, followed by loading Ag nanoparticles, growing bioactive hydroxyapatite (HA) crystals, and finally forming Ag-HA/TA composite coatings . Morphology and phase composition investigations detected the presence of Ag nanoparticles and HA crystals in the coatings. The results reveal the uniformly distributed Ag particles with a diameter of about 20– 80 nm and needle-like HA crystals with a diameter of about 18– 20 nm. Results of total antioxidant capacity tests indicate that the slow release of TA from the composite coatings leads to a persistent antioxidative activity. The antibacterial and cell compatibility tests in vitro reveal that the Ag-HA/TA coating has high antibacterial activity against both Escherichia coli and Staphylococcus aureus and good cytocompatibility effect with MC3T3-E1 cell lines. This study presents a simple and effective method for the incorporation of antibacterial agents and antioxidant into HA coatings to modify metallic implant surfaces.
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Nanomaterials
·
2020
·Vol. 10
·期 5
·987
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IF 4.324
Hui Zhang,Qi Tang,Qingshan Li,Qingwen Song,Hailiang Wu,Ningtao Mao
In this study, the effects of disperse blue dye-sensitization on the photocatalytic properties of the Ag-N co-doped TiO2nanoparticles loaded on polyethylene terephthalate (PET) filaments are investigated under visible light irradiation. The microstructure and photocatalytic properties of the as-synthesized TiO2nanocomposites, as well as the as-prepared PET filaments, are systematically characterized. The photocatalytic performance of the PET filaments coated with the Ag-N co-doped TiO2nanoparticles sensitized with disperse blue dyes is evaluated via its capacity of photo-degrading methyl orange (MO) dyes under visible light irradiation. It is found that the holes are the predominant reactive radical species and the hydroxyl and superoxide radicals play a subordinate role in the photocatalytic reaction process. The reaction rate constant of the photocatalytic composite filaments is nearly 4.0 times higher than that of the PET filaments loaded solely with TiO2nanoparticles. The resultant photocatalytic composite filaments are evident to be capable of repeatedly photo-degrading MO dyes without losing its photocatalytic activity significantly.Keywords:Ag-N co-doped;TiO2nanoparticles;sensitization;water-insoluble disperse blue dye;photocatalytic activity
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Chun Zhang,Yinan Gu,Guixiang Teng,Liping Wang,Xiaodong Jin,Zengwei Qiang,Weigang Ma
Development of highly efficient photocatalysts is a primary goal in the photocatalysis domain among which reusable composites with a synergistic photocatalytic effect have attracted extensive interest. The ability of catalysts to capture light determines their photocatalytic effect, and porous or hollow photocatalysts are more conducive to the entry and reflection of light. The goal of this research is to develop a type of visible-light-driven, double-shell photocatalyst with high antibacterial activity and excellent cycling stability. Photocatalysts were fabricated using hollow graphitized ZnFe2O4 nanospheres (G-ZnFe2O4) as the carrier. After G-ZnFe2O4 was functionalized with a polydopamine (PDA) template layer, Ag nanoparticles (NPs) and cubic AgCl NPs were in situ generated on the surface of the PDA/G-ZnFe2O4 nanospheres successively. Then, the PDA template was removed using KOH solution, and double-shell Ag/AgCl/G-ZnFe2O4 nanocubes (referred to as DAGZNs) with excellent photocatalytic antibacterial activity were constructed. The DAGZNs showed excellent antibacterial properties against Staphylococcus aureus and Escherichia coli. The efficient synergistic photocatalytic antibacterial activity coupled with magnetic separability and recyclability of DAGZNs make them potential for practical application in water purification and environmental protection. The method of designing and synthesizing double-shell structures to enhance photocatalysis may also be extended to synthesis of other photocatalytic and optical materials.
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MATERIALS CHEMISTRY AND PHYSICS
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2020
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IF 3.408
Guojun Weng,Yue Yang,Jing Zhao,Jianjun Li,Jian Zhu,Junwu Zhao
The fabrication of paper-based SERS substrates, which provided the advantages of active Raman signal enhancement with good reproducibility is still a challenge for real-world applications. In this report, we showed how the SERS enhancement and reproducibility of Au NP paper substrates prepared by inkjet-printed method could be improved significantly by second growth of Ag NPs. The Au/Ag NP paper substrates fabricated with the improved protocol had a much higher SERS enhancement (about 1.356✕10 3 times) compared with printed Au NP paper substrates. Moreover, the reaction parameters affected the SERS enhancement of Au/Ag NP paper substrates were optimized by collecting rhodamine 6G (R6G) SERS spectra. Further, the reproducibility of Au/Ag NP paper substrates were evaluated on random spots of single substrate and batch to batch substrates by recording the intensity of R6G at 611 cm −1 . The SERS intensities at 611 cm −1 showed small relative standard deviation, which indicated the good reproducibility of Au/Ag NP paper substrates. This improved method enabled the printed Au NP paper substrates to possess the practical applicability for the on-site SERS sensing.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Yingjie Chen,Zhihao Shi,Shanshan Li,Jianguang Feng,Beili Pang,Liyan Yu,Wenwu Zhang,Lifeng Dong
Heterogeneous nanoparticles with synergistic effects between different composites are potential catalysts with bifunctional catalytic activity for oxygen reduction (ORR) and oxygen evolution reaction (OER). Herein, heteroatoms such as N and S are doped into graphene substrates to improve catalytic activity and structural stability of Ag-MnFe 2 O 4 nanoparticles. Interestingly, these particles keep a primarily heterogeneous structure for their assembly on N, S-codoped graphene (NSG), while Ag domains shrink on S-doped graphene (SG) or N-doped graphene (NG). Subsequently, Ag-MnFe 2 O 4 /NSG shows the best bifunctional catalytic activity due to the improved stability of Ag-MnFe 2 O 4 NPs on NSG and enhanced bonding energy between supports and particles. The Koutecky-Levich plots confirm a major four-electron reaction pathway for the ORRs on Ag-MnFe 2 O 4 /NSG. Meanwhile, Ag-MnFe 2 O 4 /NSG exhibits higher stability and better methanol tolerance than commercial Pt/C. Therefore, Ag-MnFe 2 O 4 /NSG with bi-functional catalytic activity for ORR and OER is a promising non-Pt catalyst candidate.
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