APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Jie Chen,Meizhen Huang,Lili Kong
In this work, we have developed a sensitive, flexible, cost-effective Ag/Nanocellulose fibers SERS substrate (Ag@NCF substrate) which is suitable for in-situ food safety detection. NCFs build nanoporous networks as flexible templates. Ag nanoparticles time-efficiently, in-situ grow on the cross fibers, forming sensitive Ag clusters, providing a high density of ‘hot-spot’, further resulting in a significant enhancement of electromagnetic fields. The lowest distinguishable level of Rhodamine 6G is 10 −9 M and simplified models correspondingly reveal a high sensitivity of Ag@NCF substrate. In additions, the Ag@NCF film facilitates a simple, direct, in-situ ‘paste-test’ method for hazardous residue detection on actual food samples. The sensitive Ag@NCF substrates achieve ppb-level detection of pesticide and veterinary drug by a self-developed portable Raman spectrometer. The estimated LOD is low to 0.05 ppm for thiram, 0.09 ppm for thiabendazole, 0.0014 ppm for malachite green and 0.069 ppm for enrofloxacin, respectively. And hazardous residues could be directly detected on pear and fish by the Ag@NCF substrates. These results reveal that Ag@NCF substrate cooperated with portable Raman system is suitable for sensitive, in-situ, on-site pesticides and veterinary drugs detection on fruit or seafood and remains great potentials to expand to other on-site, in-situ applications.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2020
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IF 3.085
Wanying Liu,Yabo Zhu,Xiaokuan Ban,Shasha Wang,Hua Zhu
In this study, a new method is proposed for the preparation of Ag/black phosphorus composite in an anhydrous system. Before the preparation, black phosphorus (BP) bulk is firstly preprocessed by a wet ball milling method combined with sodium hydroxide, so that BP can be functionalized and a large proportion (80%) of micro-multilayer BP flakes (MBP) with hydroxyl groups can be used. Then the addition of ethylene glycol and polyvinylpyrrolidone into the synthesis system prevents agglomeration of hydroxylated MBP flakes and enables the uniform distribution of Ag + on BP flakes, thereby yielding an Ag/MBP composite with Ag nanoparticles uniformly dispersed on BP flakes. XRD , Raman, and XPS results indicate that the BP with its lattice structure is retained in Ag/MBP. In fact, neither Ag nor hydroxylated MBP shows photocatalytic activity ; however, in the presence of Ag/MBP, methyl orange (MO) is completely degraded within 85 min under irradiation with light of wavelength 300–2500 nm. The well dispersed Ag nanoparticles enhance the absorption of high-intensity light and facilitate the transfer of photogenerated e − from BP, finally facilitating the separation of h + and e − . Superoxide radical (·O 2 − ) and holes (h + ) are identified to be the active radicals directly involved in the degradation of MO.
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CHEMOSPHERE
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2020
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IF 5.778
Beibei Zhang,Junshen Liu,Ru-Song Zhao,Qiming Xian
Nitrosamines , which are emerging nitrogenous disinfection by-products, have raised great concern owing to their carcinogenicity and genotoxicity. Thus, exploring efficient materials to remove nitrosamines from the environment is of vital importance. In this work, NaBH 4 was taken as a reducing agent and Ag-based metal organic nanotubes (Ag-MONTs) were impregnated in FeSO 4 ·7H 2 O to prepare nanoscale zero-valent iron (nZVI) supported on the nanotubes (nZVI@Ag-MONTs). The new material was then characterized and applied to N -dimethylnitrosamine (NDMA) adsorption and degradation in water. The material had excellent ability to adsorb and degrade NDMA, and the total concentrations of iron and silver remaining in water did not exceed standard limits after 120 min of adsorption. Coexisting substances, such as NO 3 − , Cl − , CO 3 2− , humic acid , trichloromethane, and trichloronitromethane, did not affect the NDMA removal efficiency of the adsorbent. The NDMA removal efficiency of the new material exceeded 88% even in the presence of SO 4 2− and PO 4 3− . The NDMA degradation mechanism of nZVI@Ag-MONTs included a catalytic hydrogenation reaction and resulted in dimethylamine as the final degradation product . The nZVI@Ag-MONTs showed favorable stability and reusability. Taking the results together, the nZVI@Ag-MONTs proposed in this work are applicable to NDMA adsorption and degradation in water.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
·
IF 3.573
Yu Chen,Senqing Fan,Boya Qiu,Jiaojiao Chen,Yangmei Qin,Yilin Wang,Zeyi Xiao,Zenghui Mai,Ke Bai,Jingyun Liu
A catalytic membrane microreactor (CMMR) was fabricated by immobilizing ZIF-8-derived nano-Ag in membrane pores via ion exchange. ZIF-8 was first in situ assembled in polyethersulfone (PES) membrane pores with polydopamine modification. The Zn–N bond disappeared and Ag–N bond appeared after ion exchange by a AgNO3 solution. Besides, the X-ray diffraction (XRD) characteristic peaks of ZIF-8 transformed into those of the Ag–MI coordination compounds. The Ag–N bond disappeared and the characteristic peaks of Ag appeared after reduction by a NaBH4 solution. It could be observed by transmission electron microscopy (TEM) that the size of nano-Ag was 4.55 ± 1.67 nm, which was one-fifth of that without ZIF-8 as a precursor. The inductively coupled plasma emission spectroscopy (ICP-OES) test revealed that the loading capacity of nano-Ag in PES membrane pores was 31.33%. The degradation of p-nitrophenol (p-NP) was applied to test the catalytic performance of the CMMR, and the apparent reaction rate constant could be increased by 2 orders of magnitude.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Lixiang Zhang,Luping Feng,Pan Li,Xi Chen,Chenchen Xu,Sheng Zhang,Anchao Zhang,Guofu Chen,Hua Wang
A near-infrared (NIR) light-driven photoelectrochemical (PEC) sensing platform was established for the quantitative assay of Hg 2+ using Ag@Ag 2 S nanocomposites. Ag 2 S quantum dots (QDs) with the bead-chain-like nanostructure were fabricated simply via one-step oil-bath route to be further deposited with metallic Ag through the photo-reduction method to yield Ag@Ag 2 S nanocomposites. It was found that Ag@Ag 2 S-based sensor could present more than twice larger PEC responses than the Ag 2 S-based one, due to the synergetic combination of metallic Ag with the surface plasmon resonance (SPR) effects and Ag 2 S QDs with the NIR-light-irradiated PEC properties. More importantly, the developed PEC sensor could display the photocurrent responses that are selectively inhibited in the presence of Hg 2+ by forming Ag-Hg amalgam to accelerate the recombination of photo-induced electron-hole pairs. Under NIR light, it can detect Hg 2+ in the concentrations linearly ranging from 0.0010 to 5.0 nM, with a limit of detection of about 0.50 pM. This work may guide a promising combination of Ag 2 S of NIR QDs with metallic Ag of SPR effects for designing various PEC sensing platforms for the complex environmental monitoring of different heavy-metal ions like Hg 2+ .
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JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Summaira Saghir,Zhenggang Xiao
Ag@ZIF-67 was successfully prepared by using a facile and fast method at room temperature and characterized by a variety of techniques. Results indicate that prepared Ag@ZIF-67 contains a very beautiful morphology with a great active specific surface area than solo ZIF-67. The prepared Ag@ZIF-67 contains a greater pore size, which is 1.564 nm with increased functional sites. The adsorption performance of Ag@ZIF-67 was further studied with the removal of Minocycline (MC) and methyl orange (MO) from polluted water. Various adsorption parameters, such as contact time, adsorbent dosage, pH, and initial concentrations of MC and MO, were optimized. The kinetics parameters of the adsorption process were determined by applying the pseudo first-order kinetic model (PFO) and pseudo second-order (PSO) kinetic model. In the case of MC, adsorption isotherm data matched well with Freundlich as compared to Langmuir and Temkin model. While in the case of MO, adsorption isotherm data followed the Langmuir model as compared to the Freundlich and Temkin model. Ag@ZIF-67 was found to be an efficient adsorbent for the adsorption of MC and MO, having 938.4 mg/g and 994.6 mg/g adsorption capacity, which is higher than reported adsorbents.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Zhaojian Gao,Shuai Zhou,Yingmei Zhou,Hongri Wan,Cai Zhang,Bing Yao,Teng Chen
In this work, a feasible collaborative design method for preparing magnetic superhydrophobic PU-PDA-Fe 3 O 4 -Ag sponge was proposed. Inspired by mussels, polydopamine (PDA) was used as a bio-glue to adhere Fe 3 O 4 , Ag nanoparticles and octadecylamine to the skeleton of the PU sponge. Under the synergistic effect, Fe 3 O 4 , Ag nanoparticles and octadecylamine endowed the PU sponge with magnetic response properties, antibacterial activity and superhydrophobic surface. The obtained superhydrophobic PU-PDA-Fe 3 O 4 -Ag sponge showed high absorption capacity for various oils and organic solvents with up to 22.9–52.0 times its own weight, which possessed a comparable or relatively high adsorption capacity compared with other reported superhydrophobic PU sponges. Due to the magnetic properties and good elasticity of the obtained PU sponge, the adsorbed oil can be quickly circulated through magnetic recovery and mechanical extrusion. After 20 absorption-desorption cycles, the adsorption capacity of the modified sponge remained above 90.9 % of the initial value, and under negative pressure, the sponge can be used as a filter for continuous separation of light oil and heavy oil from water. In addition, the surface-modified PU sponge also shows excellent oil-in-water emulsion degreasing performance, and the separation efficiency of toluene in water can reach 96.4%. Interestingly, the resulting PU sponges exhibited antibacterial activity with the action of Ag nanoparticles, indicating their potential environmental adaptability and durability in bacteria-contaminated oil/water mixture. The multifunctional characteristics of the modified polyurethane sponge prepared in this study have great potential for the practical application of oil spill treatment.
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TALANTA
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2020
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IF 5.339
Kaiqiang Wang,Da-Wen Sun,Hongbin Pu,Qingyi Wei
The development of flexible and robust plasmonic substrates has become a hot research topic in simplifying and extending the application of surface-enhanced Raman scattering (SERS) technique for real-world analysis. In this work, a facile method to fabricate an Au@Ag nanoparticle array sandwiched between the adhesive acrylic polymer tape and polyethene terephthalate (PET) film (T/Au@Ag/PET) as a high-performance SERS chip was reported for nondestructive detection of thiram on fruit peels. For this SERS chip, the ordered Au@Ag nanoparticle array formed by the self-assembly method was closely-packed, which generated high‐density sub‐3‐nm gaps and could produce high reproducible and sensitive SERS enhancement effects. The measurement of crystal violet with the limit of detection of 7.24 × 10 −10 M was realized by targeting Raman shift at 1177 cm −1 . Moreover, the excellent flexible feature of acrylic polymer tape enabled the substrate to withstand a tensile strain value of 20% for three cycles without significantly losing its SERS activity. By covering with a PET film, the SERS chip could maintain 87% SERS activity after storage for 60 days in the air environment, and could well withstand the influence of harsh conditions such as high temperature and ultrasound treatments. As a proof of the concept, the SERS tape was directly used to detect thiram on apple, tomato, and cucumber peels via a simple sampling-and-detection procedure, and the detection limit of 5 ng/cm 2 was achieved. The T/Au@Ag/PET SERS chip should hold a promising candidate for food safety analysis in the future.
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Micro & Nano Letters
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2020
·Vol. 15
·期 14
·1007-1011
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IF 0.975
Xiaojie Song,Fan Yang,Xiufang Wang,Kehua Zhang
Biogenetic nanocomposites research provides valuable methods for the green synthesis of nanomaterials. As a dissimilatory metal-reducing bacterium, Shewanella oneidensis MR-1 is used to reduce Ag + to Ag nanoparticles (Ag NPs) (diameter about 10 nm) under anaerobic conditions, resulting in the in-situ formation of Ag NPs immobilised on TiO 2 nanotubes (TNTs) (Ag/TNTs nanocomposites). The loading amount of Ag nanocrystals on the TNT surface can be controlled easily through adjusting the AgNO 3 concentration and further influence visible-light absorption efficiency of Ag/TNTs nanocomposites by decreasing the Ag loading amount. Ag/TNTs nanocomposites show superior photocatalytic efficiency under simulated sunlight than single TiO 2 nanomaterials. Moreover, the photocatalytic capacity of Ag/TNTs nanocomposites synergistic by S. oneidensis MR-1 is further enhanced and the degradation ratio of methylene blue reaches 92.3% within 30 min which attributed to a synergistic effect.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Xinyu He,Chuang Ge,Xiangquan Zheng,Bin Tang,Li Chen,Shunbo Li,Li Wang,Liqun Zhang,Yi Xu
The rapid detection of alpha-fetoprotein (AFP) in serum is of great significance in the early diagnosis of hepatocellular carcinoma (HCC). A novel six-channel microfluidic SERS chip integrated with Ag/Au nanocomposites (NCs) for rapid SERS identification of AFP in serum was proposed in this work. Automatic injection was realized by negative pressure formed by specially designed PDMS module on the SERS chip. The serum samples originating from 60 HCC patients and 60 healthy people were measured by SERS on the designed microchip under the optimized conditions. The SERS spectra of serum samples from normal people and patients were collected and analyzed by Principal Component Analysis (PCA) which separated the characteristic Raman peaks of AFP of the two groups into two distinct clusters. Linear Discriminate Analysis (LDA) based on the PCA generated features differentiated the patients’ sera SERS spectra from the normal sera SERS spectra with a classification accuracy of 96.25% and a blind sample test accuracy of 95%. It is shown that the proposed microfludic SERS chip for AFP SERS test in serum can rapidly and efficiently identify HCC patients. It is of great research value and practical prospect in the fields of disease diagnosis and screening.
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FOOD CHEMISTRY
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2020
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IF 6.306
Huirong He,Da-Wen Sun,Hongbin Pu,Lunjie Huang
Aflatoxin B1 (AFB1) as the most toxic mycotoxin in contaminated food can greatly threaten human health, and sensitive and selective detection of AFB1 is thus highly desired. An ultrasensitive surface-enhanced Raman spectroscopy (SERS) aptasensor was developed for AFB1 detection in peanut oil samples. SH-cDNA modified Fe 3 O 4 @Au nanoflowers acted as capture probes, SH-Apt modified [email protected] nanospheres and commercial Cy3-Apt were used as reporter probes. Strong SERS signals of reporter probes were produced due to the recognition of AFB1 aptamer and its complementary strand (SH-cDNA). With the preferred binding of AFB1 aptamer to AFB1, reporter probes were released from capture probes, causing a linear decrease in SERS intensity. Therefore an ultralow detection limit of 0.40 pg·mL −1 in a wide linear range of 0.0001–100 ng·mL −1 was obtained and the sensibility of this SERS aptasensor was higher than that of the Cy3-Apt based SERS aptasensor. In addition, an excellent selectivity in interfering toxins and satisfactory recoveries of 96.6–115% in peanut oil samples were obtained, proving this aptasensor is a promising analytical tool in AFB1 detection.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
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IF 5.162
Bahaaldin Rashidzadeh,Ebrahim Shokri,Gholam Reza Mahdavinia,Reza Moradi,Sarvin Mohamadi-Aghdam,Shadi Abdi
This work reports the synthesis of novel antibacterial magnetic-/pH-sensitive hydrogel beads based on ionotropic-gelation of alginate biopolymer . Using pomegranate peels extract, green-Ag nanoparticles were synthesized inside a mixture of alginate and Fe 3 O 4 , via in situ method. The alginate beads were investigated by VSM, TEM , XRD, and FE-SEM techniques. The introducing Ag and Fe 3 O 4 nanoparticles in hydrogel beads caused a reduction in the swelling capacity of hydrogel beads. Besides, a pH-dependent swelling behavior was observed for hydrogel beads with a maximum swelling capacity at pH = 7.4. Diclofenac sodium (DS) as a model drug was loaded in hydrogel beads and its release showed a pH-dependent behavior. Drug release studies exhibited significant behaviors on the subject of physiological simulated pHs with a high release rate at pH = 7.4. The alginate beads have shown a prolonged and successive controlled drug release nearly 83% at pH = 7.4 and time 200 min. In addition to the pH, the release of DS from magnetic beads was affected by the external-magnetic-fields. Also, the Ag-incorporated alginate beads showed strong antibacterial activity against S. aureus and E. coli . These results indicated that the hydrogel beads have potentially applicable in drug delivery systems.
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