CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Dingming Yu,Lifang Liu,Bin Ding,Jianyong Yu,Yang Si
Water-borne pathogenic diseases significantly threaten human health and the global economy, and traditional water disinfection strategies such as chlorination or membrane filtration to remove pathogens still suffer from harmful byproducts, biofouling, and limited handling capacity. Here, a bottom-up strategy is reported to develop biomimetic nanofibrous aerogels with superelastic and conductive networks by assembling Ag nanowires in a 3D SiO 2 nanofibrous skeleton via freeze-drying method for safe and efficient water disinfection. Inspired by the prey capture behavior of spiders using their webs, the core of this design is constructing spanning and interconnected networks with millions of conductive nanotips, which could inactivate microbes instantaneously based on the synergistic effect of interception and electroporation. Benefitting from the high porosity (99.81 %), superelasticity, and robust structural stability of the resultant aerogels, an electroporation-disinfection device (EDD) equipped with aerogels exhibits superior bactericidal (>99.9999 %) and virucidal (>99.9 %) performances at low derive voltage (1 V) and high flux (9900 L m −2 h −1 ) with energy consumption of 0.83 Wh m −3 . This novel disinfection method provides new insights into practical water treatment in an efficient, environmental, and sustainable way.
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ANALYTICA CHIMICA ACTA
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2022
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IF 6.911
Hongying Li,Jiale Zhang,Lingling Jiang,Ruo Yuan,Xia Yang
The identification of enantiomers is of great importance in chiral separations and medicinal chemistry . While Surface-enhanced Raman spectroscopy (SERS) is a technique that provides vibrational fingerprints of analytes . The enantiomers identification relies on the SERS difference between left and right-handed circularly polarized light or additional selectors for indirect distinction. In this work, Au–Ag core shell nanobipyramid (L/ [email protected] BPs) were synthesized guiding by chiral encoder of L/D-cysteine. L/ [email protected] BPs produced plasmon-induced circular dichroism signals in the plasmon resonance absorption band , which can be tuned by modulation the amount of cysteine. Moreover, the chiral anisotropy factor of L/ [email protected] BPs at 532 nm can reach 5.11 × 10 −3 . Due to the selective resonance coupling between L/ [email protected] BPs and different enantiomers, L/ [email protected] BPs were further used as SERS substrates for efficient discrimination of biologically relevant small molecules . Chiral [email protected] BPs display the potential for chiral drug identification.
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RSC Advances
·
2022
·Vol. 13
·期 1
·499-505
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IF 4.036
Rong Wang,Jiamin Luo
Rapid and accurate identification of bacteria is essential to ensure food safety and prevent pathogenic bacterial infection. In this study, a highly efficient method was established for accurately identifying bacterial species by applying Ag NP-filter paper based Surface enhanced Raman spectroscopy (SERS) analysis and Partial Least Squares-Discriminant Analysis (PLS-DA) statistical methods. The flexible Ag NP filter paper substrate with high sensitivity and uniformity was prepared by a facile and low-cost silver mirror reaction at room temperature, which exhibited desirable SERS activity in bacteria detection. Furthermore, PLS-DA was successfully employed to distinguish SERS spectra from S. aureus CMCC 26003, E. faecalis ATCC29212 and L. monocytogenes ATCC 19115 with a sensitivity of 93.3–100%, specificity of 96.7–97%, and overall predicting accuracy of 95.8%. This exploratory study demonstrates that a Ag NP-filter paper based SERS sensor coupled with PLS-DA has great potential for rapid and effective detection and identification of bacteria.
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Analytical Methods
·
2023
·Vol. 15
·期 6
·771-777
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IF 3.1
Ying-Hua Zhou,Chen-Chen Jiang,Zhou Yu,Ya-Hao Wang,Ju-Fang Zheng,Xiao-Shun Zhou
Electroreductive dehalogenation as an efficient and green approach has attracted much attention in pollution remediation. Herein, we have employed a shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) technique to in situ probe the electroreductive dehalogenation process of aryl halides with thiol groups at Ag/aqueous solution interfaces. It is found that 4-bromothiophenol (BTP) and 4-chlorothiophenol (CTP) can turn into mixed products of 4,4′-biphenyldithiol (BPDT) and thiophenol (TP) as the electrode potential decreases. The conversion ratios estimated from the Raman intensity variations of C–Cl and C–Br vibrations are 44% and 58% for CTP and BTP in neutral solution, respectively. Furthermore, the quantitative analysis of benzene ring vibrations reveals a C–C cross coupling between the benzene free radical intermediate and adjacent TP product, which results in increased selectivity for biphenyl products at negative potentials.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Xingyu Zhao,Qi Chu,Shuang Guo,Eungyeong Park,Sila Jin,Lei Chen,Yucun Liu,Young Mee Jung
The Ag and MoO 3 layer-by-layer sputtering method was employed to fabricate Ag/MoO 3 coated on a polystyrene (PS) array (Ag/MoO 3 @PS), which exhibited excellent surface-enhanced Raman scattering (SERS) activity. The thickness of the MoO 3 layer was controlled by changing the sputtering power. The SERS intensity of 4-aminothiophenol (PATP) on Ag/MoO 3 @PS with a 2 nm thickness of the MoO 3 layer was comparable to that on pure Ag coated on the PS array (Ag@PS). This is possible because hot electrons were injected from Ag into the MoO 3 layer to enhance the photocatalyst reaction; thus, the SERS spectra of coupled PATP were obtained. The transport of hot electrons rapidly decayed and was blocked with increasing thickness of the MoO 3 layer from 2 nm to 9 nm. Thus, the SERS intensity decreased, and interestingly, the b 2 mode of PATP decreased and nearly disappeared. This study provides new insight into the control of hot electron reduction for catalytic reduction process monitoring.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 46
·24708-24716
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IF 14.511
Chaowei Li,Wenhui Wang,Xiaojuan Sun,Haili Hou,Chen Zheng,Jinagchao Zhang,Fengjun Hou,Daojun Zhang,Jimin Du,Yagang Yao
Silver–zinc (Ag–Zn) batteries are regarded as a promising power source for flexible and wearable electronics due to their high safety, high energy density, and steady output voltage. However, the weak flexibility and poor cycle performance significantly limit the practical use of Ag–Zn batteries. In this work, we propose a novel flexible fibrous quasi-solid-state mild Ag–Zn battery with superb cycling performance by using a mild electrolyte and highly flexible binder-free electrodes. Carbon nanotube fibers serve as the current collector to improve the flexibility of flexible Ag–Zn cells. The mild electrolyte containing ZnCl2 and Na2SO4 not only prevents the dissolution of the Ag cathode but also impedes the heterogeneous growth of Zn dendrites. With 1500 cycles at 1 A g−1, the fibrous quasi-solid-state mild Ag–Zn battery achieves a remarkable capacity retention of 93.1%. Moreover, this novel flexible quasi-solid-state mild Ag–Zn battery can deliver a high capacity of 103.51 mA h g−1 at 0.1 A g−1. The fibrous quasi-solid-state mild Ag–Zn battery demonstrates remarkable flexibility and excellent bending ability (after 600 bending cycles with capacity retention of 89%). This pioneering work sheds light on the establishment of high-performance quasi-solid-state mild Ag–Zn batteries for burgeoning wearable electronics.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Juan Luo,Yong Pan,Jinkun Liu,Yan Zhu,Tao Shen,Yongmao Hu
Ag or Cu NPs are typical antibacterial agents , and the pursuit of the strong efficacy under the low dosage makes them towards bimetallic or trimetallic exploration. In this study, Ag-(CuSn) nanocolloids (NCs) based on Cu, Sn and next Ag have been prepared by two steps of the chemical reduction. Phases, morphologies, structure relationships were characterized, the elements releasing behaviors in deionized water , the antibacterial performance over S. aureus , E. coli and C. albicans and the toxicity on L929 cells were also investigated. Results showed Cu, Sn were first reduced into Cu 6.26 Sn 5 alloy, Ag was further deposited on CuSn nanoparticles to form Ag-(CuSn) NCs, the NCs showed a sphere-like morphology with average size less than 30 nm, the structure changed from Ag decorated CuSn to Ag coated one as Ag amounts increased. Ag-(CuSn) NCs displayed lower MIC/MBC than those of Ag or CuSn NPs under the synergistic effect. The suppression on Cu and Ag releasing made Ag 0.2 -(CuSn) NCs and Ag 0.8 -(CuSn) NCs perform nontoxic, both good antibacterial ability and biosafety to cells offered them a potential clinical application.
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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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2022
·Vol. 32
·期 15
·6665-6676
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IF 2.036
Zhang Tuo,Qian Qiuhua,Yang Ming,Zang Cao,Zhang Bo,Hou Yan,Zhen Jinming,Zhang Ran,Han Weifang,Jia Zhengfeng
Reduced graphene oxide/silver (rGO/Ag) nanoparticles (RGANs) were prepared in an in situ facile way. The RGANs microstructure was characterized by field-emission scanning electron microscopy, transmission electron microscopy, x-ray diffraction, and Raman spectroscopy, respectively. The tribological performance of liquid paraffin (LP) containing oleic acid-modified rGO/Ag nanoparticles (ORGANs) demonstrated that the LP-ORGANs showed excellent friction-reducing and antiwear properties than pure LP. The investigation revealed that the synergetic effect and the deposition of tribo-film containing elements of C, N, O, Fe, and Ag improved their tribological properties. The permeation of Ag ions into the graphene oxide (GO) interlayers and the growth of Ag nanoparticles possibly contribute to the small Van der Waals forces of rGO nanosheets and result in excellent friction reduction and antiwear actions.
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VIBRATIONAL SPECTROSCOPY
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2022
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IF 2.382
Yuanjie Teng,Zhenni Wang,Weihao Huang,Yuanbin She
Some noble metal colloids with negative charges were mostly used as surface-enhanced Raman scattering (SERS) substrates, that the Raman signals of negatively charged molecules are hard to be detected because of the electrostatic repulsion among them and the negatively charged metal nanoparticles . Herein, Ag nanoparticles (Ag NPs) with positive charges and its Ag nanofilm were prepared by poly dimethyl diallyl ammonium chloride (PDDA) to realize the SERS detection of negatively charged molecules directly. The zeta potential and its particle sizes were characterized to select the optimum condition of PDDA. In addition, the morphology of positive Ag NPs and Ag nanofilm was characterized by UV–Vis spectroscopy and transmission electron microscopy . The SERS effect of negatively charged thiamphenicol on positively charged Ag nanofilm was significantly enhanced at the optimum condition and its sensitivity was significantly improved compared with normal Ag nanofilm. The proposed novel positively charged Ag nanofilm can be further applied to detect other negatively charged molecules by SERS.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Deyu Wang,Kun Li,Cong Zhou,Lei lei,Yoann de Rancourt de Mimérand,Xiaoyun Jin,Jia Guo
In this study, we expose various techniques based on cold plasma discharge (CPD), and more precisely aqueous-phase plasma-aided grafting (APPAG), to efficiently modify the surface of polymers as well as fabric made of natural fibers. Several directions were investigated to ultimately add a functional coating providing an antimicrobial effect to textiles. Our strategy relies on the immobilization of silver nanoparticles (AgNPs) and Bi 2 MoO 6 (BMO) – a robust inorganic photocatalyst that can be activated by visible light – microflowers, at the surface of cotton fabric fibers. Notably, an in situ complexation-assisted precipitation route (ISCAP – an original method derived from CPD) was successfully employed to generate a very uniform coating of silver nanoparticles at the surface of organic substrates. As we demonstrate in this study, the surface functionalization with BMO and silver provides a significant protection against bacteria in dark conditions, through a bacteriostatic effect of nano silver, and under low-intensity artificial visible light (thanks to the photocatalytic effect of BMO/Ag), hence suitable for an indoor environment such as hospitals. Our composite nanomaterial, cotton/BMO/AgNPs, was assessed through antibacterial testing with Escherichia coli (E. coli) and Staphylococcus aureus (S. Aureus) , showing a pronounced antimicrobial effect with both strains. This study opens prospects for the functionalization of natural or artificial fiber materials with possible applications in the field of biomedical protective equipment such as bandages, masks or technical cloths; or even photocatalysis.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Enzhu Lin,Jiang Wu,Zihan Kang,Ni Qin,Kanghui Ke,Dinghua Bao
Piezocatalysis is one of the green and promising catalytic technologies for the degradation of organic pollutants. Surface modifications such as exposed facet engineering and surface decoration of nanoparticles (NPs) are simple but useful enhancement strategies for a catalytic system. However, the synergistic effect and mechanism of facet engineering and dual-cocatalyst decoration on piezocatalytic activity are still ambiguous and more investigations are expected. Herein, the piezocatalytic activities of BaTiO3 (BTO) polyhedrons with anisotropic {001} and {110} facets and BTO cubes with isotropic {001} facets were compared. Furthermore, BaTiO3 (BTO) convex polyhedrons with selectively deposited Ag NPs and uniformly loaded Co3O4 quantum dots (QDs) are rationally synthesized through photochemical deposition. The individual and synergistic effects of Ag NPs and Co3O4 QDs on the piezocatalytic activities are systematically studied. It was found that dual-cocatalyst-modified BTO possesses the highest piezocatalytic activity in methyl orange degradation, with a reaction constant k of 0.0539 min–1, around 5, 2.2, and 1.3 times higher than that of nonmodified and Ag NP- and Co3O4 QD-modified BTO, respectively. Moreover, dual-cocatalyst-decorated BTO also exhibits excellent piezocatalytic performance in nondye pollutant degradation, with ∼100% tetracycline hydrochloride decomposed in 60 min. By analyzing the contribution, quantifying the amount of different free radicals, and comparing the chemical states of surface elements before and after piezocatalytic measurements, it was inferred that facet-dependent Ag NPs acted as efficient electron-transport sites, while uniformly loaded Co3O4 QDs served as hole-transfer sites to fully facilitate the migration of electrons and holes in a piezocatalytic reaction. This research presents a rational and effectual modification strategy to enhance the piezocatalytic activity of piezocatalysts and gives a thorough discussion of the enhanced mechanism.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Yuhua Mao,Hao Zhang,Saad Ahmed,Shanshan Li,Shouhao Zhang,Jianli Wang
In this work, we report a novel and highly efficient catalytic membrane (PES/PNM-Ag) comprising well-dispersed silver nanoparticles (NPs). The membrane can be straightforwardly constructed via dynamic loading expansible hybrid microgels PNM-Ag into a commercially-available poly(ether sulfone) (PES) membrane with asymmetric structure. Characterization results of PNM-Ag and PES/PNM-Ag indicate that a nanoscale three-dimensional network embedded with Ag NPs was developed in membrane pores by swollen microgels. The flat-sheet membrane reactor assembled with PES/PNM-Ag can efficiently and continuously catalyze the reduction of 4-nitrophenol (apparent reaction rate constant reaching 1.12 s −1 ) and showed good stability. The improved catalytic activity was attributed to fully accessible surface of Ag NPs as well as the unique structure of the membrane, in which the reactant was restricted to flow through immobilized catalyst. Present strategy hints to design other noble metal NPs loaded catalytic membranes for efficient conversion of nitro-aromatic pollutants.
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