JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Wentao Ye,Yu Jiang,Qi Liu,Doudou Xu,En Zhang,XinWei Cheng,Zhou Wan,Chen Liu
Photocatalytic technology has been attracting considerable attention due to its low cost and environmental friendly properties. In this work, a novel ZnO/Ag 2 MoO 4 /Ag (ZAA) nanocomposite was prepared by an ultrasonic-irradiation method as an efficient visible-light-driven photocatalyst. The structure and photocatalytic property of the photocatalyst were studied by XRD , SEM, FTIR, XPS , TEM , UV–vis DRS and PL Spectroscopy, respectively. The results indicated that the Ag 2 MoO 4 nanocomposites were successfully decorated on the ZnO sheets which grabbed Ag NPs. Benefiting from local surface plasmon resonance effect of metallic silver and the formation of heterojunctions between the counterparts of ZnO and Ag 2 MoO 4 , it effectively suppresses recombination of photogenerated charge carriers, which can enhance good photocatalytic properties and antibacterial activities. An optimal photocatalysis of ZAA with molar ratio of ZnO to Ag 2 MoO 4 at 40:1 performed the highest degradation rate for rhodamine B under visible light irradiation. In addition, over 99.999% of Gram-negative E. coli and 99.846% of Gram-positive S. aureus were reduced by ZAA-40 nanocomposites within 60 min in comparison to pure ZnO sheet. These results demonstrate that ZAA is a promising photocatalyst, making it a prospective strategy to overcome current challengers in the use of organic pollutant degradation and the photocatalytic antibacterial area.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2021
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IF 7.963
Tao Li,Yuhua Li,Xike Zhang,Jiawei Yuan,Junkang Guo,Pan Wang,Gehong Wei,Chun Chen
The widespread application of metal-based nanoparticle (MNPs)/reduced graphene oxide (rGO) composites inevitably leads to their release into soils. However, we lack a detailed understanding of the bacterial community response to MNPs-rGO exposure in farmland soils. Here, we conducted a soil microcosm experiment to analyze the potential impact of MNPs-rGO on bacterial communities in two field soils via high-throughput sequencing. The change in alpha diversity of bacterial communities was more susceptible to Ag-rGO and ZnO-rGO treatments than CuO-rGO. In both soils, MNPs-rGO significantly changed the bacterial community structure even at a low dose (1 mg kg −1 ). The bacterial community structure was most strongly affected by Ag-rGO at 30 days, but the greatest changes occurred in ZnO-rGO at 60 days. The differences in soil properties could shape bacterial communities to MNPs-rGO exposure. Distance-based redundancy analysis and functional annotation of prokaryotic taxa showed that some bacterial species associated with nitrogen cycling were greatly influenced by Ag-rGO and ZnO-rGO exposure. In sum, Ag-rGO and ZnO-rGO may potentially affect bacterial communities and nitrogen turnover under long-term realistic field exposure. These findings present a perspective on the response of bacterial communities to MNPs-rGO and provide a fundamental basis for estimating the ecological behavior of MNPs-rGO.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Yang Li,Zhi Liu,Zhao Li,Qiu Wang
Constructing noble metal-doped g-C 3 N 4 /carbon composites is a feasible route to overcome the intrinsic drawbacks of pristine g-C 3 N 4 for enhanced activity of CO 2 photoreduction. Herein, a novel Ag-doped g-C 3 N 4 /biomass-derived carbon composite with hollow bird's nest-like (Ag-g-C 3 N 4 /BN-C) is designed and prepared via a simple yet effective one-step pyrolysis method. In the Ag-g-C 3 N 4 /BN-C, the highly-dispersed Ag nanoparticles (20–30 nm) with the surface plasmon resonance (SPR) effect act as a significant cocatalyst not only to efficiently trap the photogenerated electrons from g-C 3 N 4 to boost the separation of photogenerated electron-hole pairs but also to produce additional active “hot electrons”, while the conductive quasi-spherical hollow structure of BN-C doubles the specific surface area with multiple reflections of light, providing abundant active sites and more utilization efficiency of light energy. As a result, the Ag-g-C 3 N 4 /BN-C exhibits a remarkably enhanced CO evolution rate of 33.3 μmol·g −1 ·h −1 without addition of any sacrificial reagents and photosensitizers, superior to those of both the pristine g-C 3 N 4 and many reported g-C 3 N 4 -based counterparts. The findings of this work demonstrate a good indication for integrating g-C 3 N 4 with SPR-dependence noble metal and renewable biomass-derived carbon for enhanced CO 2 photoreduction, which may be extended to modify other semiconductor materials for more photocatalytic applications with enhanced activity.
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RSC Advances
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2021
·Vol. 11
·期 55
·34516-34524
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IF 3.361
Qi Zhang,Tian-Song Deng,Ming-Zhang Wei,Xi Chen,Zhiqun Cheng,Shiqi Li,Yi-Jie Gu
The plasmonic properties of noble metallic nanoparticles could be tuned by morphology and composition, enabling opportunities for applications in sensors, photocatalysis, biomedicine, and energy conversion. Here, we report a method of the symmetric and asymmetric overgrowth of a Ag shell onto gold nanorods assisted by Pt pre-deposition via a 2-step approach. Firstly, gold nanorods (AuNRs), synthesized via a seed-mediated method, were used as seeds to form a AuNR–Pt structure, by using K2PtCl4 as the precursor. In this step, most of the Pt material was selectively deposited on the tips of the AuNR. Secondly, by using AgNO3 as the precursor, a Ag shell was overgrown on the surface of the AuNRs–Pt nanoparticles, resulting in a (AuNR–Pt)–Ag core–shell tri-metallic nanostructure. Due to the surface energy and lattice matching between Au and Ag, the Ag shell preferred to be epitaxially overgrown on the side of AuNR. The Ag shell thickness and symmetry of the (AuNR–Pt)–Ag could be tuned by changing the amounts of AgNO3 precursor. With the increase of the Ag shell thickness, the (AuNR–Pt)–Ag nanostructures changed from symmetric to asymmetric. The obtained (AuNR–Pt)–Ag nanostructures were studied using UV-vis-NIR spectroscopy, transmission electron microscopy, EDS mapping, DLS, and ICP-MS. The growth mechanism was discussed.
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CHEMICAL PHYSICS LETTERS
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2021
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IF 2.328
Qianqian Shang,Xin Tan,Mingcan Chen,Songyue Han,Tao Yu
High-efficient SERS substrates containing dense hot spots were fabricated by assembling 3D Ag nanoflowers (AgNFs)@Au-FTO substrate by using citrate ions as the shape-guiding agent. The vertical growth of 3D AgNFs could be attributed to the synergistic effects of the concentration gradient layer of Ag + and the density gradient of the charge carrier. Combined with the simulation result of FDTD method, the enhanced SERS sensitivity and repeatability of AgNFs@Au-FTO could be attributed to the enlarged specific surface area, and the improved density of hot spots contributed by the overlap between the vertically stacked AgNSs with a high population of sharp edges.
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ACS Applied Nano Materials
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2021
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IF 5.097
Siying Liu,Hai-Sheng Su,Zhengxia Yang,Yun Zhang
The identification of cancer cells and tumors significantly advances the accurate diagnosis of cancer and improves the patient survivor rates. However, it remains challenging to achieve the rapid and label-free differentiation of cancer cells from their normal counterparts. Herein, we developed a rapid and effective method for the synthesis of Ag nanorods (NRs) with high uniformity and yield. The surface-enhanced Raman scattering (SERS) substrates demonstrated uniformity and reliability, with a low relative standard deviation (RSD) of 10% and an enhancement factor (EF) of 3.32 × 105. The optimized AgNR SERS substrates were then applied in the quantitative analysis of creatinine and furthermore the bioanalysis of cell lysates for cell classification. Specifically, a high sensitivity with a low detection limit (LOD) of 5.3 μM and a limit of quantification (LOQ) of 17.68 μM was achieved for the detection of creatinine. More importantly, label-free SERS analysis showed the distinct spectral features of the cell lysates for normal breast cell strains (MCF-10A) and breast cancer cell strains (MCF-7, MDA-MB-231). Statistical analysis, such as t-test, principal component analysis (PCA), and orthogonal partial least-squares discriminant analysis (OPLS-DA) aided in the clear discrimination between the normal and cancer groups and further in differentiating the two cancer groups. These results demonstrate the great potential of the combination of a high-quality AgNR SERS substrate and statistical analysis for the identification of cancers.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Tingting Meng,Meirong Shi,Yingcen Guo,Huichao Wang,Nuo Fu,Zhiping Liu,Bo Huang,Chao Lei,Xiaoyu Su,Bo Peng,Ziwei Deng
Surface-enhanced Raman scattering (SERS) has been demonstrated to be an ultrasensitive and real-time analysis technique for detection of analytes with its specific fingerprint-identification feature. However, most traditional SERS-active substrates are suffering from their high expense, intricate fabrication processes and non-recyclability, which seriously hinder the applicable universality of SERS analytical technique. Thus, it is highly desired to develop highly sensitive SERS-active substrates that can be recovered in an easy way. Herein, we present a facile and inexpensive approach for fabrication of photocatalytically active Ag-coated CuO (denoted as CuO@Ag) microbowl array substrate, applicable for the highly efficient, ultrasensitive, and recyclable SERS detection. In this approach, a multifunctional CuO@Ag microbowl array is achieved based on the pre-synthesis of a quasi-2D CuO microbowl array by employing the colloidal lithography on Cu foil combined with the subsequent chemical oxidation reaction, and followed by the sputtering deposition of Ag layer on the CuO microbowl array. Importantly, this CuO@Ag microbowl array can serve as SERS-active substrate with extra advantageous feature of excellent photocatalytic activity , which enables self-degradation of analytes after the SERS-detection under visible light illumination. Remarkably, this allows for recyclable SERS detection. In the detection of model probe molecules, e.g., methylene blue (LOD: 1.3 × 10 −16 M) and Aflatoxin B 1 (LOD: 6.5 × 10 − 15 M) , approximate femtomolar level can be reached. Impressively, this substrate allows multi-detection without compromising the SERS activity. The present research provides a new and cost-effective strategy for synthesizing recyclable SERS-active substrates, which suggests plausible ways in the design of multi-functional SERS-active substrates.
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ACS Applied Materials & Interfaces
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2021
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IF 9.229
Yu Chen,Senqing Fan,Boya Qiu,Jiaojiao Chen,Zenghui Mai,Yilin Wang,Ke Bai,Zeyi Xiao
A bimetallic catalytic membrane microreactor (CMMR) with bimetallic nanoparticles in membrane pores has been fabricated via flowing synthesis. The bimetallic nanoparticle is successfully immobilized in membrane pores along its thickness direction. Enhanced synergistic catalysis can be expected in this CMMR. As a concept-of-proof, Cu–Ag core–shell nanoparticles have been fabricated and immobilized in membrane pores for p-nitrophenol (p-NP) hydrogenation. Transmission electron microscopy (TEM) for the characterization of the bimetallic core–shell nanostructure and X-ray photoelectron spectroscopy (XPS) for the characterization of the electron transfer behavior between Cu–Ag bimetal have been performed. The Ag shell on the core of Cu can improve the utilization of Ag atoms, and electron transfer between bimetallic components can promote the formation of high electron density active sites as well as active hydrogen with strong reducing properties on the Ag surface. The dispersed membrane pore can prevent nanoparticle aggregation, and the contact between the reaction fluid and catalyst is enhanced. The enhanced mass transfer can be achieved by the plug-flow mode during the process of hydrogenation catalysis. The p-NP conversion rate being over 95% can be obtained under the condition of a membrane flux of 1.59 mL·cm–2·min–1. This Cu–Ag/PES CMMR has good stability and has a potential application in industry.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Guodong Zhang,Runcheng Zhang,Fei Wang
Although activated carbon (AC) can significantly enhance hydrate nucleation kinetics due to abundant specific surface area and pore texture, the promotion drastically degenerates under low driving force and large water contents. Taking exceptional heat transfer of silver into account, silver nanoparticles were immobilized on activated carbon by in situ reduction method, giving rise to silver nanoparticle coated activated carbon (Ag-NP@AC), and the performance of Ag-NP@AC on hydrate formation kinetics was evaluated. Hydrate nucleation loaded by activated carbon was governed by external nucleation and that in inner pores, so slow hydrate nucleation was observed under low driving force and large water contents, where inner nucleation is hindered, and 500.67 min is required to induce hydrate nucleation at low overpressure (Δ P = 2.1 MPa), while 1145.4 min is inevitable for large water content ( R w = 1.4). Encouragingly, the presence of Ag nanoparticles significantly improves this limitation by enhancing external nucleation, Ag-NP@AC shortens hydrate induction time to a large extent, which reduces by 96.88% and 85.25% under mild condition (Δ P = 2.1 MPa) and large water content ( R w = 1.4), respectively. These findings provide new perspective on the application of porous carbon materials on hydrate-based solidified natural gas technologies.
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Journal of Cleaner Production
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2021
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IF 9.297
Fengjiao Lai,Feng Yan,Pengju Wang,Chunyan Li,Xuehua Shen,Zuotai Zhang
The development of heterogeneously functional catalysts is of great significance in selective catalysis for biomass valorization. Herein, we report for the first time the applicability of chitin/Ag co-modified H 3 PW 12 O 40 composites (Chx-AgPW) as catalysts for producing valuable furans from carbohydrates and biomass. The as-prepared Ch15-AgPW catalyst exhibited the best catalytic performance, due to the dual Brǿnsted-Lewis acidity and appropriate chitin content. When the amount of Ch15-AgPW catalyst was 0.25 mmol, an excellent 5-hydroxymethylfurfural (HMF) yield of 78.3% could be achieved at 150 °C for 3 h with nearly 100% glucose conversion in the H 2 O/MIBK (V H2O:MIBK = 4:6) solvent system. Furthermore, high-yield HMF could also be obtained from other carbohydrates such as fructose (85.3%), sucrose (72.3%), cellobiose (65.6%), starch (52.7%) and inulin (43.5%). Additionally, corn stover , rice straw and sugarcane bagasse under typical reaction conditions simultaneously produced furfural and HMF in yields of 64.6%–72.2% and 18.5%–25.6%, respectively. Combined with the characterization, mechanism study demonstrated that the surface functional groups in chitin were conductive to rapid absorption of the substrates; the Brǿnsted acid sites from heteropoly anion (H 2 [PW 12 O 40 ] - ) promoted the initial depolymerization of biomass and the final dehydration to furans; the introduction of Ag + favored the isomerization of intermediates. After reaction finished, the Ch15-AgPW catalyst could be easily recovered by filtration and effectively reused at least eight cycles without substantial loss in catalytic activity . This work provides a novel strategy to synthesize stable heterogeneous catalysts with tunable acidity for producing bio-based fuels and chemicals from renewable resources .
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MICROCHEMICAL JOURNAL
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2021
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IF 4.821
Ling Yao,Lei Ouyang,Jiping Lv,Pei Dai,Lihua Zhu
There is an increasing demand for rapid and sensitive detection of hydrophobic contaminants in foods. A rapid and sensitive surface enhanced Raman scattering (SERS) detection method was developed for this purpose, based on the surface modification of nano-Ag aggregates, which had rich hot spots and controllable hydrophobicity. Cationic surfactants with different carbon chain lengths were employed to modify the aggregation of Ag nanoparticles. The adsorption of cationic surfactants on nano-Ag aggregates increased the hydrophobicity of the surface of the nano-Ag aggregates as the SERS substrate. By changing the carbon chain length of the surfactant, the hydrophobicity of the SERS substrate was able to be tuned to match with the hydrophobicity of the contaminants to be detected. Different hydrophobic contaminants such as Auramine O, Sudan I and Sudan III could be quantitatively detected, with a detection limit as low as 6.1 × 10 −8 , 7.5 × 10 −9 , 2.1 × 10 −9 mol L −1 , respectively. Compared with the traditional inorganic salt aggregation method which was unable to meet the requirements of direct quantitative detection in the sample matrices, the developed method was confirmed to have the advantages of low detection limit, good reproducibility (relative standard deviation (RSD) is less 7.6%), short operation time (about 1 min), and no need of any complicate pretreatment for sample preparation.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
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IF 4.098
Xiaoran Tian,Peng Zhai,Jiaqi Guo,Qian Yu,Lingzi Xu,Xinghua Yu,Rui Wang,Xianming Kong
Plasmonic cotton gauze-Ag composite were fabricated through a simple, instant and cost-effective way, in which the Ag NPs were immobilized on the surface of cotton gauze through in-situ growth process. The in-situ growth of Ag NPs was started from electroless-immobilized Ag seeds on the surface of cotton fiber, which could form numerous hot spots for SERS compared with current method. The cotton gauze-Ag composite was employed as versatile substrate in surface-enhanced Raman scattering (SERS) spectroscopy. The plasmonic cotton gauze-Ag exhibited excellent uniformity, temporal stability and enhanced effect for SERS measurement. The detection limit of P-aminothiopheno (PATP) was 10 -8 M. Furthermore, the plasmonic cotton gauze-Ag composite presented excellent flexibility and adsorption capability, which enable to adsorb and detect pesticide residue from irregular surface of cucumber directly by simple swabbing process, the detection limit could achieve 0.1 ppm. The cotton gauze-Ag composite also shown excellent selectivity is SERS sensing. The fabrication method could be simply extended to other cellulose compound, such as absorbent cotton, paper and even for natural fibers. This study proposed a new method for fabricating the cost-effective, eco-friendly and flexible SERS substrates.
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