Materials Research Express
·
2020
·Vol. 7
·期 8
·085403
·
IF 1.929
Yanqin Xu,Jie Liu,Shumin Guan,Aotong Dong,Yuan Cao,Changguo Chen
pH-sensitive Ag/AgO/carboxymethyl chitosan (CMCS) bacteriostatic hydrogels and Ag/AgO/CMCS/Aspirin (ASP) carrier hydrogels were prepared by Ag/AgO in situ precipitation method, and the effects of swelling, degradation, drug release and antibacterial properties of hydrogels were studied. The network of Ag/AgO/CMCS/ASP drug-loaded gels produced was mainly cross-linking by hydrogen bonding and intermolecular forces, and the cross-linking silver was mainly present in the elemental Ag and Ag2+ states. Under the condition of buffer solution pH = 7.4, the cumulative release amount of Ag/AgO/CMCS/ASP drug-loaded gel was 75.20% within 12 h, and the inhibition rate of Gram-negative Escherichia coli (E. coli) reached the maximum of 92.32%, which had broad application prospects in the medical field.
研究领域:
材料科学
·
药学
·
生物医学工程
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DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 7
·4227-4243
·
IF 1.674
Deng Anquan,Zhu Yufu
TiO 2 /SiO 2 /Ag/Ag 2 O and TiO 2 /Ag/Ag 2 O nanocomposite spheres have been synthesized via a low-temperature hydrothermal method using SiO 2 spheres as templates, combined with a light-induced reduction method and a hydrogen peroxide oxidation process. Scanning electron microscopy, energy-dispersive X-ray and X-ray diffraction analyses have demonstrated that Ag and Ag 2 O nanoparticles were successfully deposited on the surfaces of TiO 2 /SiO 2 nanocomposite spheres and porous TiO 2 nanospheres forming nanoheterojunctions. The photocatalytic experiment results reveal that all the as-prepared catalysts possess improved photocatalytic activities compared with P25 nanoparticles. Both TiO 2 /SiO 2 /Ag/Ag 2 O and TiO 2 /Ag/Ag 2 O nanocomposite spheres exhibit excellent photocatalytic performances, which can be attributed to the synergistic effects of different kinds of nanoparticles. The synergistic mechanism of these nanoparticles is also discussed in detail.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Xinxin Zhang,Shiyang Cheng,Wei Zhang,Cai Zhang,Nicholas E. Drewett,Xiyang Wang,Dong Wang,Seung Jo Yoo,Jin-Gyu Kim,Weitao Zheng
Ag/Pr6O11 catalysts supported by either Pr6O11 nanorods (Pr6O11-NRs) or nanoparticles (Pr6O11-NPs) were prepared by conventional incipient wetness impregnation. The nanocomposite of Ag/Pr6O11-NRs demonstrated a higher catalytic activity for CO oxidation than Ag/Pr6O11-NPs at lower temperatures. This improved performance may be ascribed to the mesoporous features and resultant oxygen vacancies of the Pr6O11 nanorods support, as well as the large surface area and homogeneous loading of Ag species. As a result, 98.7 and 100% CO conversions were achieved at 210 and 240 °C for Ag/Pr6O11-NRs, while Ag/Pr6O11-NPs require a temperature of 320 °C to obtain the 100% CO conversion rate. These findings reveal that Pr6O11-NRs is the preferable support, comparative to Pr6O11-NPs, for Ag/Pr6O11 catalysts, for CO oxidation.
研究领域:
催化化学
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纳米材料科学
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环境化学
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表面科学
·
能源化学
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DOI
高影响因子
MATERIALS TECHNOLOGY
·
2018
·
IF 1.232
Guangyu Wu,Weinan Xing
Heterogeneous semiconductor photocatalysis has been considered as a cost-effective alternative for the eliminating hazardous pollutants and generating sustainable energy. Graphene, a 2D allotrope of carbon, has received significant attentions due to its outstanding properties. In this work, a highly efficient visible-light-driven ternary heterostructure semiconductor RGO/Ag2O/Ag2WO4 (RGAAW) Ag-based photocatalyst was prepared and its photocatalytic activity was evaluated by photodegradation of methylene orange (MO). The morphology, structure and optical absorption properties of the as-prepared RGAAW were characterized by SEM, XRD, XPS, FT-IR and UV−vis DRS, respectively. The obtained result was found that the as-prepared RGAAW exhibited the excellent photocatalytic activity, which was almost 11.5 and 7 times as high as those of individual Ag2O and Ag2WO4, respectively. The enhancement of photocatalytic performance could be attributed to the reduced graphene oxide sheets can function as an electron collector and transporter to lengthen the lifetime of the charge carriers. Moreover, the as-prepared RGAAW showed excellent stability toward the photodegradation of methyl orange (MO). The possible mechanism of photocatalytic activity enhancement was proposed.
研究领域:
材料科学
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光催化
·
环境功能材料
·
纳米材料
·
半导体物理
·
表面化学
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Xiuling Xue,Xiaoyi Chen,Xiuwen Gong
Volatile organic compounds (VOCs) can influence air quality and threaten human health; however, the development of an effective method to remediate toxic VOCs is still remain challenge. Herein, a novel silver and Ag 2 O co-doped TiO 2 with fast electron transfer modified by nitrogen doping carbon dots was prepared via a facile chemical precipitation-reduction method. Under 50 min of visible light irradiation, the novel photocatalyst exhibited approximately 50% gaseous toluene degradation efficiency, which was ca. 9.7 times and 2.2 times higher than that of bare TiO 2 and silver and Ag 2 O co-doped TiO 2 , respectively. Importantly, the photocatalyst also showed a stable structure and good recycling ability after 400 min of photocatalytic degradation with little amount of NCDs. Besides, the up-conversion effect of NCDs could emit high-energetic light and thus generate more e − -h + pairs, which could facilitate the SPR effect of Ag and thus showed strong visible light response because of the localized surface plasmon resonance (LSPR) excitation. Thus, the excellent photocatalytic performance could attribute to the synergetic effect of up-conversion effect of NCDs and SPR effect of silver which could both facilitate charge carriers separation and improve visible-light response. Finally, a possible mechanism for the excellent photocatalytic activity was proposed, in which the active species including ·O 2 − , ·OH and h + were generated and contributed to photocatalytic process. The successful fabrication of DACT provides a potential strategy for the treatment of VOCs in practical applications.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2016
·
IF 2.822
Yan Wang,Binbin Huang,Wanlin Dai,Jianshan Ye,Bin Xu
Ag/Ag 2 O-loaded poly(sodium4-styrenesulfonate) (PSS) functionalized reduced graphene oxide (rGO) composite (Ag/Ag 2 O-PSS-rGO) with high catalytic activity was synthesized for sensitive determination of capsaicin . The prepared composite was characterized by Transmission Electron Microscopy (TEM) and X-ray Photoelectron Spectroscopy (XPS). The obtained images revealed the good distribution of Ag/Ag 2 O on the PSS-rGO and confirmed the successful synthesis of the nanocomposite . Adsorptive stripping voltammetry (AdsSV) and differential pulse stripping voltammetry (DPSV) were used to study the electrochemical performance of the prepared sensor, and showed excellent electro-catalytic activity to the redox reaction of capsaicin due to the synergistic effect between Ag/Ag 2 O and PSS-rGO. Under the optimized conditions, the linear range of capsaicin was found to be 1.0–60 μM with a detection limit of 0.40 μM (S/N = 3).
研究领域:
分析化学
·
材料科学
·
食品科学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Yue Sun,Zhuo Liu,Yuchi Zhang,Le Han,Yan Xu
Doping noble metals into semiconductor based gas sensors was proved to be an effective strategy in improving gas response properties. Here, we report a silver/silver (II) oxide nanoparticles (Ag/AgO NPs) modified highly porous ZnO nanocomposite . Firstly, the Ag NPs were evenly deposited on the surface of flower-like ZnCO 3 precursors through a simple photochemical reduction method, which was then heated at 400 °C to give highly porous Ag/AgO/ZnO nanocomposite, accompaning with the dissociation of ZnCO 3 after release of CO 2 . The interleaving ultrathin and porous sheet-like features of Ag/AgO/ZnO nanocomposite afford it excellent triethylamine (TEA) sensing performance with R a /R g = 90.3 at an operating temperature of 240 °C, and the response sensitivity is 5.5-fold higher than that of pure ZnO. Specifically, the porous Ag/AgO/ZnO nanocomposite exhibited a fast response/recovery time of 53 s/8 s and oustanding long-term cyclic stability. The enhanced gas sensing performance can be attributed to the sensitization of Ag/AgO NPs, significantly increasing the number of oxygen vacancies and thus providing more reactive sites. The synergistic interaction between Ag/AgO NPs and porous ZnO nanosheets also facilitates a fast electron transport and a high permeability for gas molecules. This work displays a feasible way of coupling photochemical reduction and pyrolysis strategy to develop highly porous ZnO nanosheets functionalized by noble metal NPs with remarkably enhanced gas response property.
研究领域:
材料科学
·
传感器技术
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纳米技术
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Xueyan Chen,Honghong Wang,Min Chen,Xiaoxiao Qin,Hong He,Changbin Zhang
Ag-based catalysts are shown to be efficient for formaldehyde (HCHO) oxidation at low temperature, while the role of active Ag species in this reaction remains a controversial issue. In this work, we prepared Ag/TiO 2 catalysts with TiO 2 of different crystal structures (anatase or rutile) as supports and tested their performances in HCHO oxidation. We observed that the crystal structure of the TiO 2 support had a significant influence on the activity of the Ag/TiO 2 catalysts, and Ag/A (anatase) exhibited dramatically superior activity compared with Ag/R (rutile). More interestingly, we observed a clear inflection point in the HCHO conversion curve for the Ag/R catalyst. Combining the results of BET, XRD, TEM, XAFS, H 2 -TPR characterization and DFT calculations, we show that HCHO oxidation on Ag/TiO 2 catalysts is a co-function process of multiple active sites including surface oxygen, Ag 2 O, and metallic Ag species. The low-temperature non-renewable surface oxygen and Ag 2 O species mainly contribute to HCHO oxidation in the low-temperature range, while metallic Ag species are primarily responsible for the reaction at high temperature since metallic Ag is capable of activation of oxygen at high temperature. The relative contents of surface oxygen, Ag 2 O and metallic Ag species are different on the Ag/A and Ag/R catalysts. The dispersion degree of metallic Ag species also differs on the Ag/A and Ag/R, therefore their capacities for oxygen activation are quite dissimilar. The above factors combine to result in distinct catalytic behaviors for Ag/A and Ag/R in HCHO oxidation, as well as the appearance of an inflection point.
研究领域:
催化化学
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环境化学
·
材料科学
·
表面科学
·
物理化学
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DOI
高影响因子
Scientific Reports
·
2021
·Vol. 11
·期 1
·1-9
·
IF 4.38
Li Danqing,Chen Shuai,Zhang Ke,Gao Nan,Zhang Miao,Albasher Gadah,Shi Jiangfan,Wang Chuanyi
Silver-based antibacterial agents have obtained wide attention due to the fact that bacteria in the environment is ubiquitous, which has become one of the most difficult problems for human health. However, the antibacterial mechanism and process are still inconclusive. Here, Ag 2 O nanoparticles (NPs) with uniform spherical morphology and small size (around 30 nm) were prepared. The as-prepared Ag 2 O NPs induced high antibacterial activity (100% inhibition ratio) against E. coli . A two-step antibacterial process was proposed and confirmed, which divided into inhibition and sterilization steps. The optical density measurement, malondialdehyde concentration detection, morphologic imaging with electronic microscopy and Fourier transform infrared spectroscopic analysis unveiled the interaction of Ag 2 O NPs with E. coli , which verified the inhibition–sterilization process we proposed.
研究领域:
纳米技术
·
微生物学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Huizhen Huang,Xuefeng Sha,Yi Cui,Shiyan Sun,Hongye Huang,Ziyang He,Meiying Liu,Naigen Zhou,Xiaoyong Zhang,Yen Wei
Herein a simple and novel approach has been developed for surface modification of delaminate MXene with nano-mixed silver oxide which combined with mussel-inspired chemistry. Surface modification with dopamine as a secondary reaction platform for loading nano-silver compounds for removal of iodine was achieved. The internal structure and morphology were characterized by SEM and TEM. The element content and distribution analysis of EDS and XPS proved that nano silver compounds were successfully supported and uniformly dispersed on the surface of MXene. Then the adsorption batch experiment was carried out, adsorption time, pH and other factors on the adsorption performance of the adsorbents were studied in details. By calculating the enthalpy change, Gibbs free energy and thermodynamic parameters, the adsorption reaction was found to be an exothermic process. The adsorption kinetics measured the maximum adsorption capacity of 80 mg/g and the removal efficiency is as high as 80% and the adsorption equilibrium time has also been improved. The adsorption kinetics were well fitted by pseudo first-order and second-order models. All the above results demonstrated that the composite from mussel-inspired chemistry has excellent adsorption properties towards iodine ions. This study not only deepens the research on the adsorption behavior of iodine adsorption, but also provides new research directions and experimental methods for pseudo-iodine adsorption.
研究领域:
材料科学
·
环境化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2020
·
IF 4.302
Shengyan Pu,Zeng Yang,Jing Tang,Hui Ma,Shengyang Xue,Yingchen Bai
The degradation of pharmaceutical micropollutants is an intensifying environmental problem and synthesis of efficient photocatalysts for this purpose is one of the foremost challenges worldwide. Therefore, this study was conducted to develop novel plasmonic Ag/Ag 2 O/BiVO 4 nanocomposite photocatalysts by simple precipitation and thermal decomposition methods, which could exhibit higher photocatalytic activity for mineralized pharmaceutical micropollutants. Among the different treatments, the best performance was observed for the Ag/Ag 2 O/BiVO 4 nanocomposites (5 wt.%; 10 min's visible light irradiation) which exhibited 6.57 times higher photodegradation rate than the pure BiVO 4 . Further, the effects of different influencing factors on the photodegradation system of tetracycline hydrochloride (TC-HCl) were investigated and the feasibility for its practical application was explored through the specific light sources, water source and cycle experiments. The mechanistic study demonstrated that the photogenerated holes (h + ), superoxide radicals (•O 2 − ) and hydroxyl radicals (•OH) participated in TC-HCl removal process, which is different from the pure BiVO 4 reaction system. Hence, the present work can provide a new approach for the formation of novel plasmonic photocatalysts with high photoactivity and can act as effective practical application for environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Yue Tang,Xiangqiang Zhan,Jia Zheng,Zhengmin Xie,Shuangju Zhu,Yuangen Wu
The long-term and excessive use of organophosphorus pesticides (OPs) leads to hazardous residues in the environment, which threatens human health to a considerable extent. Colorimetric methods can quickly and readily identify pesticide residue , but they still have various challenges in accuracy and stability. Herein, a smartphone-assisted and non-enzymatic colorimetric biosensor was constructed for rapid monitoring of multiple OPs based on the enhanced effect of aptamer on the catalytic ability of octahedral Ag 2 O. It was demonstrated that the aptamer sequence could enhance the affinity of colloidal Ag 2 O to chromogenic substrates, and accelerate the generation of oxygen radicals such as superoxide radical (·O 2 − ) and singlet oxygen ( 1 O 2 ) from dissolved oxygen, thereby significantly increasing the oxidase activity of octahedral Ag 2 O. The color change of the solution can be easily converted to the corresponding RGB values by a smartphone for quantitative and rapid detection of multiple OPs. Hence, the smartphone-based and visual biosensor of multiple OPs was acquired with limit of detection of 10 μg L −1 , 28 μg L −1 and 40 μg L −1 for isocarbophos , profenofos and omethoate , respectively. The colorimetric biosensor also exhibited good recoveries in several environmental and biological samples, showing that it may have broad application prospects for detecting OPs residues.
研究领域:
环境科学
·
分析化学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）