CATALYSIS TODAY
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2019
·
IF 4.888
Qiong Liu,Ertao Liu,Ju Li,Yuan Qiu,Rong Chen
Spindle-like Ag/ZnO nanostructure has been successfully synthesized via an ultrasonic-microwave combined assisted method. The as-prepared Ag/ZnO nanocomposites exhibited enhanced photodegradation efficiency for organic pollutants than pure ZnO and commercial TiO 2 (P25) under visible light irradiation, which was probably due to the surface plasmon resonance (SPR) effect of Ag nanoparticles . The production of hydroxyl radicals ( OH) under visible light irradiation was greatly promoted via loading Ag nanoparticles on the surface of ZnO nanostructures, also resulting in the improved photocatalytic activity. Moreover, the spindle-like Ag/ZnO nanocomposites displayed excellent antibacterial activities for both Gram-positive and Gram-negative bacteria. The Ag/ZnO nanocomposites could penetrate and damage cell membrane, causing the leakage of cytosol and the inactivation of respiratory chain dehydrogenase. The synergistic effect of Ag and ZnO is also beneficial for the mass production of H 2 O 2 , leading to the enhanced antibacterial activities of nanocomposites.
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高影响因子
ACS Biomaterials Science & Engineering
·
2019
·
IF 4.511
Shilei Wang,Qiaomu Huang,Xiangyu Liu,Zhao Li,Hao Yang,Zhong Lu
The integration of nanomaterials with clinical therapeutic instruments is a promising approach to improve the effects of nanomaterials. We reported an efficient synergistic antibacterial strategy formed through the combination of Ag/ZnO nanocomposites with a light-emitting diode (LED) curing light, which is a commonly used small instrument in dental clinics. The as-designed integration depicted a significantly enhanced bactericidal effect on facultative anaerobic oral pathogen Streptococcus mutans (S. mutans) both in planktonic and biofilm phases over a very short irradiation time (≤5 min). Further study showed that the combination of LED and Ag/ZnO nanocomposites induced more ·OH and ·O2– generation, which is responsible for the enhanced antibacterial activity. Moreover, this combination could destroy S. mutans biofilm by killing the bacteria embedded within biofilm, inhibiting exopolysaccharide production and down-regulating the biofilm-related gene expression. Therefore, it is proposed that this combination could be applied in dental clinics to realize dental caries prevention and dental restoration simultaneously.
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PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Sefiu Abolaji Rasaki,Chunlei Zhao,Rui Wang,Jiacheng Wang,Heng Jiang,Minghui Yang
In this work, Ag/ZnO nanorods are prepared via simple and cost-saving liquid precipitation citrate reduction process (LPCR). The system shows appreciable catalytic activity for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) wherein NaBH 4 is used as electron sacrificer at ambience. It is found out that ZnO nanorods can effectively prevent Ag NPs agglomeration; a problem normally reduces active sites density. The coupling effect between the Ag NPs and ZnO greatly enhances electron transfer rate. This gives rise to high reduction rate constant ( k app ) of ˜3.97 × 10 −3 s −1 for the catalytic reduction of 4-NP. The result is about 1.9times better than that of Ag NPs (2.07 × 10 −3 s −1 ). The k app is well fitted into pseudo-first order kinetics with high correlation coefficient (R 2 ) of about 0.994, indicating chemisorptive reduction process. The remarkable performance obtained here is attributed to strong coupling effect between Ag NPs and ZnO nanorods derived from LPCR synthesis method.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Xiujing Huang,Yingbo Chen,Xianshe Feng,Xiaoyu Hu,Yufeng Zhang,Lei Liu
In this study, Ag@ZnO-Oleic acid (OAc)/polyamide (PA) thin film nanocomposite (TFN) membranes were prepared by interfacial polymerization with dispersing hydrophobic Ag@ZnO-OAc core-shell nanoparticles in trimesoyl chloride (TMC) solutions. The Ag@ZnO-OAc nanoparticle structure and interactions between OAc and TMC were confirmed by TEM , XPS and FTIR. Surface morphology , roughness, chemical composition, hydrophilicity and charges of the synthesized membranes were characterized by SEM, FTIR, contact angle and zeta potential analyses. The results showed that incorporating the Ag@ZnO-OAc nanoparticles into the PA layer improved chemical and physical properties of the TFN membranes. Compared with the nanoparticle-free TFC membrane, the Ag@ZnO-OAc/PA TFN membrane showed a considerably higher salt rejection, and a lower flux decline rate when tested with filtration of BSA solution as a model foulant and a higher flux recovery with water flush. In addition, the Ag@ZnO-OAc/PA TFN membrane showed excellent antibacterial performance against E. coli and S. aureus .
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高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zhengdong Zhu,Konghao Han,Yating Feng,Zhihao Li,Anxin Zhang,Tao Wang,Maofeng Zhang,Wei Zhang
Microplastics are persistent pollutants that accumulate in the environment and can cause serious toxicity to mammals. At present, few technologies are able to quantitatively detect chemicals and provide morphological information simultaneously. Herein, we developed a dragonfly-wing-mimicking ZnO nanorod array decorated with AgNPs on polydimethylsiloxane (PDMS) as a surface-enhanced Raman spectroscopy (SERS) and photo-induced enhanced Raman spectroscopy (PIERS) substrate for trace analysis of microplastics. The Ag/ZnO@PDMS hybrid nanorod array endows the sensor with high sensitivity and signal repeatability (RSD ∼ 5.89%), ensuring the reliable quantitative analysis of microplastics. Importantly, when the noble metal–semiconductor substrate was pre-radiated with ultraviolet light, a surprising PIERS was attained, achieving an additional enhancement of 11.3-fold higher than the normal SERS signal. By combining the PIERS technology with the “coffee ring effect”, the sensor successfully discerned microplastics of polyethylene (PE) and polystyrene (PS) at a trace level of 25 μg/mL even with a portable Raman device. It was capable of identifying PS microspheres in contaminated tap water, lake water, river water, and seawater with detection limits of 25, 28, 35, and 60 μg/mL, respectively. The recovery rates of PS microspheres in four water environments ranged from 94.8 to 102.4%, with the RSD ranging from 2.40 to 6.81%. Moreover, quantitative and visualized detection of microplastics was readily realized by our sensor. This portable PIERS sensor represents a significant step toward the generalizability and practicality of quantitative and visual sensing technology.
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高影响因子
International Journal of Electrochemical Science
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2023
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IF 1.5
Yao Wang,Dan Li,Junfeng Kang,Shiye Guan,Daoxin Wu
In this work, graphene (GR) and Ag-ZnO nanocomposites were prepared and used together with methylene blue (MB) as electrode materials to modify a glassy carbon electrode (GCE). The electrochemical behavior of L-tryptophan (L-Trp) on the fabricated MB/Ag-ZnO/GR/GCE was investigated by cyclic voltammetry and differential pulse voltammetry. MB/Ag-ZnO/GR clearly enhanced the electrochemical oxidation of L-Trp. In a 0.1 mol/L phosphate buffer solution at pH 4.0, the peak current response at the modified electrode increased linearly with an increase in the L-Trp concentration from 2.0 x 10 -6 to 1.4 x 10 -4 mol/L, and the detection limit (S/N = 3) was 1.0 × 10 -6 mol/L. The electrode showed good reproducibility, stability, and selectivity. The sensor was used for the determination of L-Trp in biofluid samples (pig serum and pig urine), and the recovery rate ranged from 97.1% to 104.2%. The fabricated electrode was proposed for the electrochemical analysis of L- Trp, indicating the potential for practical applications in the biological field.
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高影响因子
MACROMOLECULAR BIOSCIENCE
·
2018
·Vol. 18
·期 7
·1800028
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IF 3.392
Yi Deng,Lei Yang,Xiaobing Huang,Junhong Chen,Xiuyuan Shi,Weizhong Yang,Min Hong,Yuan Wang,Matthew S. Dargusch,Zhi-Gang Chen
Polyetheretherketone is attractive for dental and orthopedic applications due to its mechanical attributes close to that of human bone; however, the lack of antibacterial capability and bioactivity of polyetheretherketone has substantially impeded its clinical applications. Here, a dual therapy implant coating is developed on the 3D micro-/nanoporous sulfonated polyetheretherketone via layer-by-layer self-assembly of Ag ions and Zn ions. Material characterization studies have indicated that nanoparticles consisting of elemental Ag and ZnO are uniformly incorporated on the porous sulfonated polyetheretherketone surface. The antibacterial assays demonstrate that Ag-decorated sulfonated polyetheretherketone and Ag/ZnO-codecorated sulfonated polyetheretherketone effectively inhibit the reproduction of Gram-negative and Gram-positive bacteria. Owing to the coordination of micro-/nanoscale topological cues and Zn induction, the Ag/ZnO-codecorated sulfonated polyetheretherketone substrates are found to enhance biocompatibility (cell viability, spreading, and proliferation), and hasten osteodifferentiation and -maturation (alkaline phosphate activity (ALP) production, and osteogenesis-related genetic expression), compared with the Ag-decorated sulfonated polyetheretherketone and the ZnO-decorated sulfonated polyetheretherketone counterparts. The dual therapy Ag/ZnO-codecorated sulfonated polyetheretherketone has an appealing bacteriostatic performance and osteogenic differentiation potential, showing great potential for dental and orthopedic implants.
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PubMed
高影响因子
SOLID STATE SCIENCES
·
2022
·
IF 3.752
Jyunhong Shen,Antong Shi,Mengfan Wu,Hongyu Zhang,Zhuwu Jiang
For the advanced treatment of micropollutants from wastewater, this study synthesized a ternary Ag/ZnO/ZnAl‒LDH composite photocatalyst with performance optimization based on the Taguchi approach. The optimal synthesis parameters were statistically determined as the Ag doping amount of 5 wt%, Zn 2+ and Al 3+ with a molar ratio of 3:1, Ag/ZnO and ZnAl‒LDH with composite ratio of 3:2, and PEG-200 dosage of 25 mL. The optimally synthesized Ag/ZnO/ZnAl‒LDH achieved the efficient degradation of bisphenol A (BPA) under visible light irradiation, and the reaction rate constant was about 4.8-, 2.2- and 12.0-fold higher than that of ZnO, Ag/ZnO and ZnAl‒LDH, respectively. As proved by various characterizations, the enhanced photocatalytic performance of Ag/ZnO/ZnAl‒LDH can be attributed to the improvements of optoelectronic properties, such as the widened visible light responsivity and facilitated charge transfer, thus resulting in a significant increase of hydroxyl radicals (·OH) formation. Fluorescence measurements and radical quenching experiments indicated that ·OH mainly contribute to the degradation of BPA, and the oxidation of H 2 O by holes was the dominant formation pathway. According to the above results, this study summarized and proposed the enhanced photocatalytic mechanism of Ag/ZnO/ZnAl‒LDH for ·OH production and BPA removal.
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高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Wenqiang Liu,Meng Zhou,Heqing Fu
A ternary Ag@ZnO@Ti 3 C 2 MXene heterojunction (AZM) is synthesized by hybridizing ZnO and Ag nanoparticles with the MXene via a simple hydrothermal and chemical deposition method. The addition of ZnO and Ag can effectively compensate for MXene’s narrow bandgap property, promote charge carrier separation, and improve visible light absorption , thereby enhancing photocatalytic activity. The photocatalytic activity of the AZM is evaluated through the removal efficiency of methylene blue (MB) dye and levofloxacin (LVX) under visible light irradiation. The results show that the optimized ternary AZM heterojunction photocatalysts (AZM-15) possesses the maximum degradation of MB (90.54%) with a reaction rate constant of 0.0473 min −1 , while the maximum degradation of LVX (86.76%) has a reaction rate constant of 0.0408 min −1 . Moreover, the AZM composite exhibits excellent stability, which explains its MB removal rate of 83.59% and LVX removal rate of 80.03% after five cycles. The results of trapping experiments and EPR demonstrated that the main active species in the MB and LVX photodegradation process are·OH and·O 2 - . This work not only elucidates a possible mechanism of photocatalytic degradation of organic pollutants but also provides a pathway to design new bandgap photocatalysts for mitigating environmental pollution .
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Feiya Fu,Jiayuan Gu,Jinfeng Cao,Rongsheng Shen,Hanxiang Liu,Yanyan Zhang,Xiangdong Liu,Jinping Zhou
This work proposed a straightforward and sustainable strategy to synthesize a Ag/ZnO decorated cellulose nanocomposite. First, zincate was introduced into an aqueous cellulose–NaOH/urea dope to enhance the solution stability. Second, AgNO3 was directly added into the cellulose dope without gelation, and then was reduced into Ag NPs by cellulose chain. Finally, zincate transformed into ZnO via biomimetic mineralization along with the regeneration of the cellulose dope, and an Ag/ZnO decorated cellulose nanocomposite film was synthesized. The Ag NPs with a mean diameter of 16.5 nm were well dispersed in the cellulose matrix, and some were doped on the surface of the embedded ZnO crystal. With increase of the Ag loading, the nanocomposite film showed more rapid sterilization for Escherichia coli than Staphylococcus aureus, and complete eradication could be achieved within 3 h for both bacteria. This simple and environmental friendly method hopefully provided new routes for large-scale production of antibacterial cellulose-based nanohybrids in industry.
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高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Zi-Yao Chen,Wen-Zhu Shao,Wei-Jian Li,Xue-Yin Sun,Liang Zhen,Yang Li
Due to the strong surface energy and polarity, ZnO nanoparticles are prone to adsorbing the OH groups dissociated from water in the air, leading to easy agglomeration and hence deteriorating the dispersion of ZnO in composites. In this work, it has been theoretically and experimentally demonstrated that doping with lower electronegativity metallic ions is an effective strategy to suppress the agglomeration of ZnO nanoparticles. By calculating the adsorption energies and electronic structures of OH/M-doped ZnO configurations (M = Li+, Cu2+, Al3+), it was found that metallic ion doping with a lower electronegativity (in comparison to that of the host Zn2+) can efficiently reduce the adsorption of OH groups on the ZnO surface due to the lower effective bond order of M–O bonds. Guided by the theoretical results, various M-doped ZnO nanoparticles (M = Li+, Cu2+, Al3+) were prepared and characterized by X-ray photoelectron spectroscopy and a laser particle sizer, which confirmed that the lower the electronegativity of dopants, the lower the OH groups’ adsorbed amounts and aggregate sizes of M-doped ZnO nanoparticles. This work provides a general avenue to design the composition of M-doped ZnO nanoparticles for suppressing agglomeration and enhance the dispersion of ZnO in composites.
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高影响因子
Materials Advances
·
2022
·Vol. 3
·期 11
·4520-4525
·
IF 0
Yongqi Yin,Xiao Liu,Mengqi Wang,Shuang Li,Yan Chen,Ye Sun
Surface-enhanced Raman scattering (SERS) and metal-enhanced fluorescence (MEF) phenomena can significantly increase spectroscopic signals, allowing sophisticated biological detection to be realized. However, integrating SERS and MEF into a single plasmonic platform is still a challenge, since the optimized distance between the analyte and the metal is different for these two detection techniques. Herein, we designed a three-dimensional (3D) electromagnetic field via decorating silver (Ag) nanoparticles on a zinc oxide (ZnO) nanorod arrays to overcome this limitation, and the ultrasensitive detection of Rhodamine 6G dye molecules at extremely low detection limits of 10 fM for SERS and 100 fM for MEF can be realized. The underlying enhancement mechanism investigated via finite-difference time-domain simulations revealed that the 3D electromagnetic field could overcome the quenching effect in MEF to achieve the simultaneous enhancement of the SERS and MEF signals. This work provides a way to apply 3D architecture to realize ultrasensitive SERS-MEF dual-mode detection.
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