CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Yizhen Zhang,Lifen Liu,Bart Van der Bruggen,Michael K.H. Leung,Fenglin Yang
Berberine is a widely used antibiotic in China, its photocatalytic degradation is not well understood nor its efficient treatment reported. In this study, it is most quickly and efficiently degraded (97.9% under UV and 98.9% under visible light) using a free-standing 3D composite photo-electrode, with well dispersed Ag nanoparticles (Ag NPs) over well-aligned ZnO nanorods arrays (ZnO NAs) on Ni foam (NiF), compared to ZnO NAs/NiF, ZnO powder and P25. The composite photo-electrode was prepared by first directly growing ZnO NAs on NiF hydrothermally, followed by photo-deposition of Ag NPs, without any inactive binders or non-conductive substrates. It was characterized using scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), X-ray Diffraction (XRD), ultraviolet–visible spectrophotometry (UV–Vis) and electrochemical analysis (I-t, EIS). The highest activity of Ag NPs/ZnO NAs/NiF in degrading the target pollutant, is due to the synergy of easy pollutants diffusion and fast reaction on active sites, from suppressed electron-hole recombination by Ag NPs/ZnO NAs heterojunctions, extended light absorption by surface plasmon resonance (SPR) of Ag NPs and accelerated electron transport on the conductive macro-porous NiF. The reactive oxidizing species ( OH, O 2 − , h ± ), degradation intermediates and possible degradation pathways of berberine over Ag NPs/ZnO NAs/NiF were examined respectively. This free-standing whole piece photo-electrode with UV–visible light response, is easy to recycle and assemble, that not only degrades pollutant, but also generates electricity as photo-anode in a photo-catalytic fuel cell reactor using carbon fiber cloth as cathode.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Yanyan Zhao,Yongbo Wang,Xuhua Liang,Huanxian Shi,Cunjin Wang,Jun Fan,Xiaoyun Hu,Enzhou Liu
A visible-light-induced antibiotics degradation system based on a nano-Ag, CsPbBr 3 quantum dot (QDs) and bulk g-C 3 N 4 (CN) ternary assembly (Ag-CsPbBr 3 /CN) has been firstly constructed under an organic phase environment, oleylamine (OLA) and oleic acid (OA) were used as surfactants to stabilize the CsPbBr 3 , l -cysteine was used to facilitate the interaction between nano-Ag, CsPbBr 3 and CN. The new ternary assembly of Ag-CsPbBr 3 /CN composite was used to degrade 7-aminocephalosporanic acid (7-ACA) under visible light irradiation, and the 7%-Ag-CsPbBr 3 /CN composite displayed the superior photocatalytic activity, approximately 92.79% of 7-ACA has been degraded to CO 2 , H 2 O and other small molecules at 140 min, which was approximately 1.49-folds, 1.56-folds, 3.01-folds and 11.43-folds higher than 9%-CsPbBr 3 /CN, 7%-Ag/CN, pure CN and pure CsPbBr 3 , respectively. A possible mechanism for 7-ACA degradation over Ag-CsPbBr 3 /CN composite were proposed according to detailed measurements of adsorption test, Brunauer-Emmett-Teller (BET) measurement, UV–vis diffuse reflectance spectra (DRS), photoluminescence spectra (PL), transient photocurrent response and electrochemical impedance spectroscopy (EIS) measurement, and the enhanced photocatalytic activity of Ag-CsPbBr 3 /CN composite could be attributed to the excellent adsorbability, the enhanced light-harvesting and reduced charge recombination, as well as the synergistic effects of nano-Ag and CsPbBr 3 co-loaded with CN. In addition, Holes (h + ) and hydroxyl radicals ( OH) played major roles, electronic (e − ) and superoxide radical ( O 2 -) played minor roles based on the reactive-species-trapping experiments, the NBT transformation and the 7-hydroxycoumarin fluorescent experiments. Furthermore, a possible 7-ACA degradation pathway was investigated based on the Liquid Chromatography-Mass spectroscopy (LC-MS) experiment to better understand the degradation process. The present opens up a new insight for using CsPbBr 3 as photocatalyst to degrade antibiotics.
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Materials Science & Engineering C-Materials for Biological Applications
·
2019
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IF 4.959
Mingjin Zhu,Xinying Li,Liming Ge,Yaxin Zi,Man Qi,Yulin Li,Defu Li,Changdao Mu
Silver nanoparticles (AgNPs) are effective antimicrobial reagent, especially for the treatment of multidrug-resistant microorganisms. However, it is difficult to remove the residual harmful reducing agents in AgNPs synthesized by the traditional chemical reduction method. In addition, AgNPs exhibit cytotoxicity when exposed directly to cells for biomedical applications and will rapidly aggregate in aqueous environment. Herein, we develop a new route to synthesize submicron-particles containing AgNPs ( κ C@Ag MPs) with high aqueous stability, robust antibacterial activity and low cytotoxicity. AgNPs were firstly greenly synthesized using κ -carrageenan as environmental friendly reducing and stabilizing agent under heating in aqueous solution. Then the AgNPs were immobilized in the net of κ -carrageenan by adding KCl to obtain κ C@Ag MPs. The results indicated that κ C@Ag MPs were quite stable without any agglomeration and precipitation in aqueous solution for more than three months. κ C@Ag MPs exhibited robust antibacterial activity against Gram-positive and Gram-negative bacteria, even better than that of pure AgNPs. Notably, κ C@Ag MPs maintained the long-lasting retention of antibacterial activity. In addition, κ C@Ag MPs possessed well cytocompatibility towards the L02 and L929 cells. Overall, κ C@Ag MPs may have prospective application as effective and sustainable antibacterial agent in biomedical fields.
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PubMed
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2019
·Vol. 166
·期 14
·B1258
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IF 3.12
Wenqin Yao,Hao Guo,Hui Liu,Qi Li,Rui Xue,Ning Wu,Li Li,Mingyue Wang,Wu Yang
In the present work, a novel and selective electrochemical sensor based on copper porphyrin metal organic frameworks (Cu-MOFs) and Au@Ag core-shell nanoparticles decorated multiwalled carbon nanotubes (MWCNT) was designed for the simultaneous determination of acetaminophen (ACOP) and dopamine (DA). The fabrication strategy was accomplished via drop casting of MWCNT-Au@Ag onto the bare glassy carbon electrode (GCE) and then electrodeposition of Cu-MOF on the MWCNT-Au@Ag/GCE. By combining the high surface area (400.54 m2·g−1) of Cu-MOFs with superior conductivity and electrocatalytic properties of MWCNT-Au@Ag nanocomposites, the proposed sensor exhibited the remarkable performance for the electrocatalytic detection ACOP and DA. Under the optimized conditions, Cu-MOFs/MWCNT-Au@Ag/GCE delivered good differential pulse voltammetric response in the ACOP concentration of 1.0∼40, 40∼500 μM and the DA concentration of 0.6∼70, 70∼300 μM with the detection limit of 0.232 μM for ACOP and 0.082 μM for DA, separately. In addition, the designed electrochemical sensor was applied for the determination of ACOP and DA in real samples with reliable and satisfying recoveries (97.88∼104.38% for ACOP and 98.28∼104.40% for DA, respectively) and precisions (2.15∼4.78% of RSD for ACOP and 1.47∼4.46% of RSD for DA, respectively). As expected, these data suggested that the Cu-MOFs/MWCNT-Au@Ag was an excellent potential platform for simple and convenient determination of ACOP and DA.
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OPTICS EXPRESS
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2019
·Vol. 27
·期 17
·23981-23995
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IF 3.561
Anxin Jiao,Hua Zhang,Linlin Xu,Yue Tian,Xiangdong Liu,Ming Chen,Feng Chen
The blue laser beam-excited surface-enhanced Raman scattering (SERS)-based pH sensing holds great promise for avoiding undesired thermal heating effect on some special temperature-vulnerable molecules, as compared to the vast majority studies by exciting in the red or near-infrared (NIR). Herein, we report an ingenious approach to support core-shell Au@Ag nanodendrites (NDs) on TiO2 nanowires, which can possess enhanced SERS activity under 473 nm laser excitation, owing to the improved charge-transfer effect on modified TiO2 support by inserting plasmonic Au@Ag. By using pH-indicating 4-mercaptobenzoic acid (4-MBA), the obtained TiO2/Au@Ag NDs can not only exhibit high sensitive linear-responses of pH changes ranging from pH 4.0 to 9.0 in different solutions (deionized water, NaCl, CaCl2, and MgCl2) but also provide excellent temperature stability under 4°C, 25°C and 37°C temperatures as well as good time stability after storage for 10 days. The established SERS-pH sensing by using shorter wavelength laser excitation is highly desirable for understanding physiological process in temperature-vulnerable microenvironment.
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CERAMICS INTERNATIONAL
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2018
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IF 3.057
Xiang Lv,Tianhe Wang,Wei Jiang
We report a novel method to prepare translucent and stable Ag@AgCl/g-C 3 N 4 /TiO 2 ceramic films having strong photocatalytic activities and self-cleaning capabilities under light irradiation. Colloidal silica was used as an inorganic binder and P25 TiO 2 was added as a hydrophilicity enhancer without which a smooth coating was not achievable. Ag@AgCl of particle size around 30 nm, was synthesized by in-situ oxidation of nano-silver particles in porous g-C 3 N 4 /TiO 2 films. Optimal conditions for Ag@AgCl/g-C 3 N 4 /TiO 2 preparation in terms of strongest photocatalysis were established by tests on Rhodamine B degradation under visible and full spectral irradiations. A good adhesion strength of the porous films on glass substrate was achieved. Stability and reusability of the films were assessed by cycling tests. Possible photocatalytic mechanisms are proposed based on the basis of trapping experiments. Systematic characterization of the film suggests that the in-situ oxidation is an effective and practical method to produce nanoscale Ag@AgCl.
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RSC Advances
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2018
·Vol. 8
·期 8
·3964-3973
·
IF 2.936
Li Sun,Yuechao Yin,Pengcheng Lv,Wenxian Su,Lixin Zhang
The controllable synthesis of Au–Ag alloy nanoparticles (NPs) without any hazardous or expensive chemical agent has been a challenge. This paper reports on the Chinese wolfberry fruit extract-assisted synthesis of Au–Ag alloy NPs with homogeneous composition, uniform alloy microstructure and a small average size less than 15 nm. The composition and the surface plasmon resonance (SPR) wavelength of Au–Ag alloy NPs could be linearly adjusted by the synthesis time in one-pot. Au–Ag alloy NPs were characterized by means of various techniques, and then their synthesis mechanism was discussed. The obtained Au–Ag alloy NPs were used as photocatalysts for the reduction reactions of 2-, 3-, and 4-nitrophenol and exhibited superior photocatalytic activity and stability. The rate constants of the above photocatalytic reactions could be linearly tuned by the composition of the Au–Ag alloy NPs and also by their addition amount, displaying a new method to control the rate constant. Furthermore, based on the controllable synthesis, the rate constant could even be predetermined just through setting the synthesis parameters of the Au–Ag alloy NPs.
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TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2018
·
IF 1.795
Qiu-hang CHEN,Shi-liang MEI,Wu YANG,Wan-lu ZHANG,Gui-lin ZHANG,Jia-tao ZHU,Rui-qian GUO
Color tunable quantum dots (QDs) based on the Cu, Mn, Ag co-doped ZnInS core and ZnS outer-shell were synthesized by using an eco-friendly method. Core-shell doped QDs with the average size of 3.85 nm were obtained by using a one-pot synthesis followed by a hot injection with n -dodecanethiol (DDT) and oleylamine (OLA) as stabilizers in oil phase. Cu, Mn and Ag ions were introduced as single-dopant or co-dopants during the synthesis, providing an effective means to control the emission color of the QDs. The as-synthesized QDs showed photoluminescence emission ranging from green (530 nm) to near-red (613 nm), adjusted by doping components, dopant concentration, and Zn/In ratio. Importantly, quasi-white emission has been achieved by controlling the concentration of co-doped metal ions (Mn, Cu and Ag). The primary results demonstrated the promising potential of co-doped QDs as alternative materials for future high quality white LED applications.
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ANALYTICA CHIMICA ACTA
·
2018
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IF 5.123
Baoyi Shao,Xiaoyuan Ma,Sen Zhao,Yan Lv,Xu Hun,Haitao Wang,Zhouping Wang
Contamination of mycotoxins has been a general problem of food safety and afflicts people all around the world. Ochratoxin A (OTA), an abundant and representative food-contaminating mycotoxin, has a detrimental effect on our health. Herein, an ultrasensitive surface-enhanced Raman scattering (SERS) aptasensor was fabricated for OTA detection. Au (core) @Au-Ag (shell) nanogapped nanostructures ( [email protected] NNSs) were coupled with Fe 3 O 4 magnetic nanoparticles (Fe 3 O 4 MNPs) by OTA aptamer and its complementary DNA sequence . The distance between two nanoparticles become far away in presence of the OTA due to the affinity of aptamer. This effect can obviously bring about the change of Raman intensity which can be used for the detection of OTA. Compared with pure metal nanoparticles, [email protected] NNSs can effectively enhance the Raman intensity of Raman signal molecule (4-MBA) via the ultrasmall nanogap, which contribute to the sensitivity of the sensor system. Additionally, the utilization of Fe 3 O 4 MNPs offers a green, economical and facile technology to capture targets from solution. The specially modified aptamer and its complementary strand establish a bridge connecting between [email protected] NNSs and Fe 3 O 4 MNPs. In this study, OTA concentration with a linear range of 0.01–50 ng mL −1 and the limit of detection (LOD) was as low as 0.004 ng mL −1 . The proposed SERS aptasensor can combine both of these above type of materials and provide a rapid, sensitive, and low-cost methodology for numerous future applications of point-of-care diagnostics.
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JOURNAL OF SOLID STATE CHEMISTRY
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2018
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IF 2.179
Shi-Yuan Zhang,Yuan-Yuan Yang,Yue-Qing Zheng,Hong-Lin Zhu
Electrocatalytic reduction of CO 2 to useful fuels or chemicals is a promising path for carbon recycling. In this study, a novel mixed-metallic MOF [Ag 4 Co 2 (pyz)PDC 4 ][Ag 2 Co(pyz) 2 PDC 2 ] was synthesized, and it transformed into Ag doped Co 3 O 4 catalyst, which exhibits excellent electro-catalytic performance for reduction of CO 2 in water to syngas (H 2 + CO). The as-prepared Ag/Co 3 O 4 material exhibits a high selectivity of CO in 0.1 M KHCO 3 aqueous solution (CO 2 saturated) with the corresponding faradaic efficiency up to 55.6%. Compared with the Ag/Co 3 O 4 electrode, the maximum faradaic efficiency (FE) of CO of pure Co 3 O 4 is 21.3% at − 1.8 V vs. SCE. The results show that the presence of Ag can improve the efficiency of CO significantly, thereby inhibiting the production of H 2 . The stability of the samples can be maintained for more than 10 h at − 1.8 V vs. SCE. The ratio of production between H 2 and CO can be controlled by varying the potential values.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Dandan Song,Yuanzhe Wang,Xiong Lu,Yukun Gao,Yan Li,Faming Gao
Two-dimensional (2D) MoS 2 shows great potential in the areas of electrochemical sensors due to their ultrathin structure and predominant physicochemical properties. However, pristine 2D MoS 2 nanostructure exists inherent disadvantages such as the limited electrical conductivity, surface area and easy aggregation or restacking. Here, nitrogen-fluorine co-doped monolayer 2D MoS 2 nanosheet decorated with Ag nanoparticles (Ag NPs-N-F-MoS 2 ) nanocomposite is prepared and it exhibits superior conductivity, remarkable electron mobility and high electroactive surface area. The obtained Ag NPs-N-F-MoS 2 are employed as a sensing platform for the electrochemical determination of organophosphate pesticide, coupled with enzymatic inhibition. Under optimized conditions, the acetylcholinesterase (AChE)/amino functionalized carbon nanotubes (CNTs-NH 2 )/Ag NPs-N-F-MoS 2 bioelectrode is superior in sensing performances for the detection of monocrotophos and chlorpyrifos, with wide linear ranges, low detection limit as low as 0.05 pg mL −1 (0.2 pM) and 1 pg mL −1 (3 pM) at a signal-to-noise ratio of 3, satisfactory selectivity, reproducibility and long-time storage stability. All results indicate that the Ag NPs-N-F-MoS 2 nanocomposite holds great promise for constructing an ultra-sensitive electrochemical sensing interface for the determination of pesticides.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
·
IF 2.829
Yaqian Dan,Chengquan Zhong,Huanwen Zhu,Jun Wang
For surface-enhanced Raman spectroscopy (SERS) substrates, complexity of the fabrication process, sensitivity and stability are factors that need to be considered. We report a simple and novel method for preparing an effective substrate that greatly enhances SERS signals. The SERS substrate is fabricated by selectively electroless deposition of Ag nanoparticles in the highly ordered porous anodized aluminum oxide (AAO) template and then etching it to form Ag nanorod bundles structure, so that the Raman enhancement occurs in the gap between the nanorods and the top of the nanorod bundle, which is verified by finite element analysis . A peculiarity of this method is that this is the first time to synthesize Ag nanorod arrays structure by using it. The results indicated that this prepared substrate has special micro-nano structure and when rhodamine 6 G is selected as the detection reagent, the detection limit is as low as 10 −16 M with excellent recyclability. This outstanding array structure has a promising practical application in SERS field.
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