PROGRESS IN ORGANIC COATINGS
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2022
·
IF 6.206
Xiutian Guo,Jiale Yao,Fengxian Ji,Rui Wang,Longyun Hao
In this study, a stable silver@polypyrrole (Ag@PPy) composite was prepared with the help of sodium dodecyl sulfate (SDS) and polymerizable surfactant ammonium allyloxynonylphenol ethoxylate (DNS-86). It was then combined with polyurethane acrylate (PUA) to prepare a conductive ink and applied on the surface of cotton fabric. By an energy-saving and sustainable UV curing method, the ink was effectively fixed to fabricate flexible and durable textile. The effects of DNS-86 on the properties of Ag@PPy composite were investigated and the results showed that DNS-86 could reduce its size, make its distribution more uniform and improve its stability. Then, the effects of DNS-86 on the performance of conductive coating on fabric were analyzed by measuring the resistance and water contact angle, revealing that DNS-86 could participate in the UV film-forming reaction of PUA molecules, so as to optimize the film structure for higher conductivity. Finally, the effect of DNS-86 on the flexibility and durability of conductive coating were evaluated. The results indicated that DNS-86 could improve the structural integrity and toughness of PUA film, enhance the adhesion between conductive coating and cotton surface, and make it more resistant to various environmental erosions.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
·
IF 4.831
Hong Zeng,Hongli Yang,Yue Tang,Xiaojuan Niu,Yuangen Wu
A facile and simple colorimetric biosensor was first established for paraquat (PQ) detection based on the aptamer-enhanced oxidation process of 3,3′,5,5′-tetramethylbenzidine (TMB) by Ag + . The study confirmed that the interaction of PQ-15 aptamer with Ag + accelerates the electron transfer from the aptamer-Ag + complex to dissolved oxygen, which enhances the release of superoxide anion radicals (O 2 ̇ − ) and facilitates the catalytic oxidation of the chromogenic substrate. PQ-15 aptamer will preferentially bind to PQ molecules, resulting in no further enhancement of the catalytic activity of Ag + . Molecular docking results revealed that the PQ molecules are attached to the stem-loop region of the PQ-15 aptamer through σ-π conjugation interactions. The proposed method is simple that only contains Ag + and corresponding aptamer. The limit of detection (LOD) of the constructed colorimetric biosensor for PQ detection was determined to be 16.5 μg·L -1 , belowing the maximum residue limit in fruits and vegetables set by the EU. Moreover, the colorimetric biosensor showed excellent selectivity and anti-interference properties, which was validated for detecting PQ residues in several typical agricultural and water samples.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Dong Li,Ran Tian,Shiyu Kang,Xue-Qiang Chu,Danhua Ge,Xiaojun Chen
Ag nanoparticles (Ag NPs) with high electrocatalytic activity are of great significance for electrochemical sensors. Nanostructures as scaffold can solve aggregation problem of Ag NPs so that to ensure the stability. In this work, Ag NPs immobilized on FeS 2 nanoprisms (Ag/FeS 2 ) were prepared via an in-situ photocatalytic reduction approach. The enlarged electrode effective surface area, enhanced electron transfer and the synergic impact between Ag NPs and FeS 2 lead to an enhanced catalytic activity. The electrochemical detection method exhibited great performance of low detection limit (0.6 μM), wide linear range and high sensitivity (244.4 μA mM −1 cm −2 ) for H 2 O 2 . Moreover, Ag/FeS 2 as a peroxidase mimic can catalyze oxidation of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue product (oxTMB) by H 2 O 2 , which achieved effective detection of H 2 O 2 with a 3.0 μM detection limit. A promising way was successfully eatablished to perform the quantitation of H 2 O 2 in serum and beverage.
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Materials Advances
·
2022
·Vol. 3
·期 11
·4520-4525
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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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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Xiao-han Pan,Jian-hua Zu,Jing-jie Diao,Yi Xue,Si-yu Liu
The aim of current work was to explore a new material for the fast, efficient and selective recovery of precious metal silver (Ag(I)) from electroplating effluents to alleviate its high consumption and mitigate its environmental pollution. In this study, the sulfydryl-rich covalent organic framework (COF-SH) was prepared by solvothermal method . Its Ag(I) adsorption performance was evaluated by batch adsorption experiments that the effects of initial Ag(I) concentration, ratio of adsorption dosage to solution volume, adsorption time and reacting temperature were studied. The isothermal data fitted well with the Langmuir model and the maximum adsorption capacity at 298 K was up to 609.89 mg/g. The adsorption rate was very fast almost achieving adsorption equilibrium within 16 min. The adsorption rate and adsorption capacity increased with the increase in reaction temperature. The perfect fitting with pseudo-second-order kinetic model indicated the adsorption process was dominated by chemisorption process. Weber–Morris intraparticle diffusion model divided the adsorption process into three stages and temperature had a positive correlation with the first stage, external surface diffusion . The thermodynamic fitting results suggested that the adsorption process was endothermic, disordered and spontaneous. In terms of application, COF-SH achieved highly selective adsorption of Ag(I) in simulated electroplating wastewater with coexistence of multiple metal ions , especially at high acidity (≥1 M HNO 3 ), and the increase in concentration of competing ions had no affects. In addition, 1 M HNO 3 + 0.3 M thiourea (TU) could be used as desorption agent with 100% Ag(I) desorbed from the adsorbed adsorbent COF-SH-Ag.
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POLYMER
·
2022
·
IF 4.432
Baojie Dou,Jianwu Lan,Shiying Lang,Yazhou Wang,Lin Yang,Hongyu Liu,Yafang Wang,Anrong Yao,Shaojian Lin
Development of multifunctional materials for efficient treatment of complex effluents containing water-insoluble oils and water-soluble dyes is highly desired. In this work, a multifunctional Ag/AgCl decorated CO 2 - responsive cotton membrane (Ag/AgCl@PCM) was successfully fabricated for simultaneous or successive removal of oils and dyes (both cationic and anionic dyes). Through achieving protonation and deprotonation in response to the CO 2 , the as-prepared Ag/AgCl@PCM could reversibly switch from superhydrophobic (uncharged) state to superhydrophilic (charged) state. Moreover, the Ag/AgCl endowed the Ag/AgCl@PCM with visible light photocatalytic activity . Based on these ingenious features, the as-prepared Ag/AgCl@PCM could bidirectional separation of various oil/water mixtures with high separation efficiencies (≥97.50%), accompanying with satisfactory fluxes, due to controllable wettability upon CO 2 stimulation. Moreover, the as-prepared Ag/AgCl@PCM exhibited stable oil/water separation property, even under various adverse environmental conditions. Meanwhile, the Ag/AgCl@PCM could eliminate the dyes in wastewater through adsorption for anionic dyes and photocatalysis for cationic dyes. The results presented that MB (anionic dye) could be efficiently removed by the Ag/AgCl@PCM under both static and dynamic states in the presence of CO 2 . The maximum static adsorption capacity of the Ag/AgCl@PCM toward MB reached 2168.47 mg g −1 with a fast adsorption rate (12 min of adsorption equilibrium time). For the removal of cationic dyes, the photo-degradation efficiency of the Ag/AgCl@PCM toward RhB (cationic dye) was up to 94.30% within 6 h. Most importantly, the as-prepared Ag/AgCl@PCM exhibited photo-induced self-cleaning performance due to the existence of Ag/AgCl, which endowed it with excellent recyclability. Additionally, the as-prepared Ag/AgCl@PCM displayed outstanding antibacterial activity . In summary, the Ag/AgCl@PCM could be viewed as a satisfactory material for oil/water separation and dyes removal and exhibits great potential in wastewater remediation.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Zhiyang Chen,Yue Sun,Jiyong Shi,Wen Zhang,Xinai Zhang,Xiaowei Hang,Zhihua Li,Xiaobo Zou
The goal of food safety supervision is to directly identify the pesticide residues on the surface of fruits and vegetables. This study proposed to develop a facile, non-destructive, and sensitive method based on surface-enhanced Raman scattering (SERS) to detect non-systemic pesticides on the surface of fruits and vegetables. The composite material was prepared by loading CTAB guided Au@Ag NRs with positive charge onto filter paper which was modified with PDADMAC(+) and PSS(−) using electrostatic adsorption. Au@Ag NRs with bimetallic synergies were effectively adsorbed in the fiber grid to generate 3D SERS hotspots within a few microns of depth. The results showed that the 3D composite flexible substrate had a high SERS activity, great repeatability, and sensitivity when the method was utilized to detect 4-MBA, methyl-parathion, thiram and chlorpyrifos. Three kinds of non-systemic pesticides on the peel could be detected directly and quickly owing to the arbitrary bending of the substrate, demonstrating the efficiency of the SERS “paste-reading” method. The acquired findings demonstrated that PDADMAC/PSS/Au@Ag NRs composite filter paper had the potential to provide rapid feedback for in- situ analysis of pesticide residues on the surface of fruit and vegetable.
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高影响因子
JOM
·
2021
·Vol. 74
·期 2
·622-633
·
IF 2.474
Liu Zhihong,Ye Fengchun,Chen Rui,Wang Hongjun,Xia Longgong
Halogen-containing organic components in waste electrical and electronic equipment have an obvious influence on the distribution behaviors of valuable metals during the smelting processes. However, the mechanism is still incomplete in the literature. The equilibration-quenching-(ICP+EPMA) experimental technique has been applied in studying the partitioning behaviors of Au, Ag, and Sn in the Cu-FeO x -SiO 2 -CaO-Al 2 O 3 smelting system in the presence of halogen elements (F, Cl, Br). The obtained results showed that: (1) 93% Au terminated into the alloy phase in CaF 2 adding experiments, and a maximum of 32% Au reported to the gas phase in CaCl 2 or CaBr 2 adding experiments; (2) 22–49% Ag entered the gas phase when adding CaF 2 into the system, and 3–34% Ag entered into the gas phase when adding CaCl 2 or CaBr 2 ; and (3) halogen elements influenced Sn dramatically, and portions of Sn in the gas phase and slag phase increased along with increasing temperature or halides dosage.
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Journal of Materials Research and Technology-JMR&T
·
2021
·
IF 5.039
Youliang Cheng,Ying Wei,Changqing Fang,Hang Li,Jing Chen,Jin Zhang,Zhigang Huang
Waterborne polyurethane (WPU) and Ag NPs have been applied widely in packaging. However, WPU was susceptible to the contamination due to high moisture absorption, and the stability of Ag NPs in matrix polymers was still low. To resolve this problem, chitosan (CS) was used as the dispersant to synthesize CS/Ag NPs composites in this work, and then they were mixed with WPU to prepare CS/Ag-WPU films. CS macromolecules provided the carriers for Ag NPs with a diameter of about 2.5 nm, and Ag NPs were dispersed stably in WPU. Compared with pure WPU film, as-prepared CS/Ag-WPU films had a higher thermal stability at low temperature, and the crystal size for WPU increased after introducing CS/Ag NPs. Importantly, the water contact angle for CS/Ag-WPU-5 increased to 54.2° from 27.5° implying that the hydrophobicity was improved. In addition, CS/Ag-WPU composites exhibited an excellent inhibitory effect on Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). Antibacterial performances of most samples were improved with the crease of the concentration of CS, and the inhibitory effect on S. aureus was preferred. Therefore, as-prepared CS/Ag-WPU films in this paper have a potential application in antibacterial packaging field.
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VIBRATIONAL SPECTROSCOPY
·
2023
·
IF 2.5
Xiaojun Wen,Jumei Li
In this study, we coatedmagnetic Fe 3 O 4 nanospheres with a crystalline mesoporous TiO 2 (mTiO 2 ) layer with photocatalytic activity, followed by the deposition of Ag nanoparticles as an outer layer through in-situ reduction of AgNO 3 to obtain multifunctional Fe 3 O 4 /mTiO 2 /Ag core-shell-shell structured composites. By adjusting the amount of AgNO 3 , we were able to precisely control the size and coverage of the Ag nanoparticles. To evaluate the surface-enhanced Raman spectroscopy (SERS) activity of the Fe 3 O 4 /mTiO 2 /Ag composites, we employed 4-mercaptobenzoic acid (4-MBA) as a model Raman reporter. The limit of detection (LOD) of 4-MBA was down to 10 −10 M. Moreover, for practical applications, we successfully detected methylene blue (MB) in different water samples, such as tap water and industrial wastewater, and both of systems presented an ultralow LOD of 10 −9 M. Notably, a strong linear relationship (R 2 ≥ 0.95) between the SERS intensities and the logarithmic concentration of MB was observed, highlighting the excellent quantitative sensing capabilities of these substrates. The Fe 3 O 4 /mTiO 2 /Ag composites also exhibited remarkable signal reproducibility and exceptional stability during storage. Additionally, these composites demonstrated promising photocatalytic property. In five consecutive cycles, we were able to efficiently detect MB by utilizing the composites' photocatalytic removal ability under UV irradiation , which was facilitated by simple magnetic separation. These findings hold significant importance for environmental safety and pollutant removal applications.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Kunfeng Xue,Bingyong Lin,Qiukai Tang,Yuanyuan Yao,Yueliang Wang,Lifen Chen,Zuguang Li,Yanbo Zeng,Lei Li,Longhua Guo
Establishing a simple, sensitive, and accurate α-fetoprotein (AFP) detection methods is of great significance for the early diagnosis of hepatocellular carcinoma (HCC). Surface-enhanced Raman spectroscopy (SERS) has been identified as one of the most promising techniques for clinical monitoring. However, accurate detection of AFP is still challenging due to the poor stability of SERS substrate and the low abundance of AFP in the early stages of HCC. Herein, we developed an ultrasensitive and highly stable paper-based 3D SERS immunoassay array for AFP detection, combining the superior advantages of self-assembled AuNBPs@Ag nanorods, filter paper, and sandwich immunoassay. In the immunoassay array, 4-mercaptobenzoic acid (4-MBA) linked to the secondary antibody was employed as the Raman reporter, while the array modified with antibodies was used to capture AFP. The SERS immunoassay array sensor exhibited a wide linear range (3 pg mL −1 to 10 µg mL −1 ), low detection limit (0.086 pg mL −1 ), good specificity, and high signal reproducibility (RSD < 5 %). Meanwhile, the sensor is further used for accurate detection of trace AFP in serum, which paves an avenue for the fabrication of SERS substrates with high stability and provides a new outlook for their application in the early diagnosis of cancer.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Teng Chen,Zhiyu Liu,Kai Zhang,Bolin Su,Zhenhua Hu,Hongri Wan,Yan Chen,Xinkai Fu,Zhaojian Gao
A functional material integrated with a variety of functions is highly desired in wastewater treatment. In this research, a mussel-inspired method of immobilizing silver nanoparticles on the skeleton of a melamine sponge is proposed and applied for water remediation. Ag NPs were reduced in situ and grown on a polydopamine-modified melamine sponge. The catalytic reduction of 4-nitrophenol (4-NP) in the presence of the obtained MS-PDA-Ag was evaluated, and the results demonstrated that the MS-PDA-Ag presented high catalytic reduction activity. In addition, the monolithic MS-PDA-Ag presents excellent reusability with no remarkable decrease in catalytic efficiency after multiple reuses. Owing to the immobilized Ag NPs, the MS-PDA-Ag can also effectively inhibit the growth of bacteria against both gram-positive and gram-negative species, making it possible for bacteria elimination in polluted water. To further explore the possibility of utilizing the MS-PDA-Ag for versatile applications, a superhydrophobic derivative (S-MS-PDA-Ag) was prepared by coating a low-surface-energy substance (octadecanethiol) on the surface of MS-PDA-Ag. The obtained S-MS-PDA-Ag presents the capacities of oil/organics adsorption and water repellence, which can separate the insoluble oil/organics from water. The melamine sponge immobilized with Ag NPs demonstrates prominent catalytic reduction of 4-NP, antibacterial activity and the superhydrophobic derivative presents the capacity of insoluble oil/organics separation from oil–water mixtures, exhibiting high potential in the remediation of polluted water.
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