CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Ying Zhang,Yuanwu Liu,Pengfei Cheng,Weiming Song,Xuyan Zhang,Shiya Rong,Xingsen Gao,Guofu Zhou,Zhang Zhang,Junming Liu
Developing highly-efficient visible-light-driven photocatalyst for water disinfection is an attractive strategy to address the current shortage of safe drinking water and environmental remediation. Since the low dependence on growth substrate and the narrow bandgap nature made ReS 2 one of the best two-dimensional (2D) materials for photocatalytic sterilization. Herein, we fabricated Ag/ReS 2 composite, a 0D/2D heterostructure, which can be grown on three universal substrates through a facile chemical vapor deposition (CVD) and thermal evaporation process. Benefiting from the vertical growth of ReS 2 nanosheets and the hybrid effect from Ag and ReS 2 , the visible-light response of Ag/ReS 2 can be greatly enhanced, exhibiting an excellent photocatalytic antibacterial efficiency towards Escherichia coli ( E. coli ) after 30 min of visible-light exposure, providing a promising environmentally friendly alternative method for water disinfection. Moreover, the universal substrate growth and good stability also endow the photocatalyst with potential applicability in various fields.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Xiuting Li,Hongmei Liu,Chenjie Gu,Jinjie Zhang,Tao Jiang
The acquisition of a robust plasmonic substrate with both appreciable molecule anchoring and quantitative detection features is a prerequisite for the reliable adhibition of surface-enhanced Raman scattering (SERS) technology. Herein, an innovative sophisticated SERS substrate was proposed by spin-coating titanium dioxide (TiO 2 ) onto a flexible polydimethylsiloxane (PDMS) film followed by the modification of triangular silver (Ag) nanoplates through in-situ reduction. The absence of organic surfactants during this process rendered the substrate great opportunity in effectively enriching molecules and the assembly of TiO 2 and Ag made it a reusable and sensitive SERS platform. After a recyclable monitoring of 4-aminothiophenol (4-ATP) with different concentrations was carried out by reusing the hybrid substrate for 8 cycles, a limit of detection as low as 1.58 × 10 −9 M was achieved. The distinctive intrinsic Raman signal from PDMS matrix was further verified to successfully correct the poor detection linearity by serving as internal standard and the coefficient of linear correlation (R 2 ) was improved from 0.967 to 0.997. In this regard, the as-prepared multifunctional PDMS/TiO 2 /Ag hybrid substrate with simulation-estimated electromagnetic “hot spots” exhibited remarkable quantitative recyclable detection performance.
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SURFACE & COATINGS TECHNOLOGY
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2021
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IF 4.158
Dexin Chen,Yaoxin Li,Hongyuan He,Wei Li,Rong Zeng,Xiaojian Wang
Silver antibacterial composite coatings were prepared on additive manufactured Ti6Al4V substrates by merging anodic oxidation , molecular grafting, and spray deposition methods. The surface microstructure, composition, elemental characteristics, and antibacterial properties of the composite coatings were obtained. When the anodizing time was varied from 0.5 to 4 h, the results revealed that the average inner diameter of TiO 2 nanotubes (TNTs) increased from 19.9 nm to 78 nm and the average wall thickness decreased from 22.9 nm to 12.8 nm, concluding the optimized voltage of 40 V and anodizing time of 1 h. X-ray diffraction spectra depicted that the structure of TNTs transformed to the more stable anatase phase with a small amount of rutile phase after annealing. After molecule grafting, silanes are covalently bonding to the TNTs via amino groups and Si-O-Si networks. With the help of the covalent bonding between Ag and TNTs, the Ag + release has been slowed down significantly from 1.127 ppm to 0.17 ppm. Bare TNTs show a certain antibacterial effect with an antibacterial rate of 57.5% for E. coli and of 50.1% for S. aureus . When the spraying pass for Ag deposition is 10, the prepared AgNPs embedded coatings have significantly improved the antibacterial properties, as the antibacterial efficiencies are 100% for all these silane-modified TNTs surfaces.
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Crystals
·
2021
·Vol. 11
·期 12
·1573
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IF 2.589
Xiaoqing Si,Xiaoyang Wang,Chun Li,Tong Lin,Junlei Qi,Jian Cao
Reactive air brazing has been widely used in fabricating solid oxide fuel/electrolysis cell (SOFC/SOEC) stacks. However, the conventional Ag–CuO braze can lead to (I) over oxidation at the steel interconnect interface caused by its adverse reactions with the CuO and (II) many voids caused by the hydrogen-induced decomposition of CuO. The present work demonstrates that the Ag particle interlayer can be used to join yttria-stabilized zirconia (YSZ) electrolytes to AISI 441 interconnect in air instead of Ag–CuO braze. Reliable joining between YSZ and AISI 441 can be realized at 920 °C. A dense and thin oxide layer (~2 μm) is formed at the AISI 441 interface. Additionally, an interatomic joining at the YSZ/Ag interface was observed by TEM. Obtained joints displayed a shear strength of ~86.1 MPa, 161% higher than that of the joints brazed by Ag–CuO braze (~33 MPa). After aging in reducing and oxidizing atmospheres (800 °C/300 h), joints remained tight and dense, indicating a better aging performance. This technique eliminates the CuO-induced issues, which may extend lifetimes for SOFC/SOEC stacks and other ceramic/metal joining applications.Keywords:solid oxide fuel/electrolysis cells;sintering;YSZ;Ag particle interlayer;aging
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Li Zhang,Weiwei Lu,Peng Xu,Hao Wang,Xuefeng Wei,Kaisheng Yao,Shuge Peng
In this study, we propose a novel photo-activation method to remove persistent organic pollutants through a SO4˙ˉ-based advanced oxidation process . Core–shell Ag@Pd nanocubes were prepared by a facile seed-mediated method and, afterward, explored for photodegradation of a representative ionic liquid (IL), [C 4 mim]Br. Electron paramagnetic resonance measurements and radical scavenging experiments demonstrated that the species mainly responsible for degrading [C 4 mim]Br were the radicals of SO4˙ˉ. The plasmon-mediated nature of the Ag@Pd catalysts was verified by their wavelength-dependent performance. Subsequent optical simulation indicated that, other than the plasmonic Ag core, the non-plasmonic Pd shell was the preferential site for dissipating the absorbed photons into energetic charge carriers to produce the radical species. Finally, based on the detected intermediates, we propose the degradation pathway of ILs in the plasmon-mediated process. The results of our method suggest favorable application in the treatment of wastewater.
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FOOD CHEMISTRY
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2021
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IF 7.514
Fanxing Meng,Yanan Qin,Wenrui Zhang,Fei Chen,Li Zheng,Jun Xing,Aihemaitijiang Aihaiti,Minwei Zhang
In this study, a high-performance flexible reduced graphene oxide (rGO) paper electrode composed of silver nanoparticles (Ag NPs) for the detection of Sudan I was fabricated. Ag NPs were doped with rGO nanoheets by self-assemble and assembled into a paper electrode with layer-by-layer structure via vacuum filtration. Thanks to the highly efficient electrocatalysis of Ag NPs towards reduction of azo bond, the as-prepared hybrid paper can be used alone as a flexible sensor for the detection of Sudan I in chili powder, with the high sensitivity (22.93 μA μmol/L) and the low detection limit (41.3 nmol/L). The sensor also expressed good selectivity, repeatability, reproducibility, stability and recovery between 96.1% and 101.8% (RSD < 6%). With the advantages of low-cost and scalable production capacity, such Ag NPs/rGO functional papers can be used as flexible disposable sensors for electrochemical detection of Sudan I.
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MICROCHEMICAL JOURNAL
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2021
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IF 4.821
Chunwen Chang,Qun Wang,Qiang Xue,Fei Liu,Lili Hou,Shengyan Pu
Chloramphenicol (CAP) is a typical broad-spectrum antibiotic, which is still frequently detected in various water environments. In this work, a novel electrochemical sensor was developed to detect CAP in water environment by loading TiO 2 modified with sodium carboxymethyl cellulose (CMC) and silver nanoparticles (AgNPs) onto the laser-induced graphene (LIG). The Ag/CMC@TiO 2 /LIG electrode was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and contact angle (CA) analysis. The mechanism of the enhancement of electrochemical signal is that the dispersion of CMC promotes the synergistic catalysis of AgNPs and TiO 2 NPs. The electrochemical properties of the Ag/CMC@TiO 2 /LIG electrode were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The Ag/CMC@TiO 2 / LIG electrode shows a low CAP detection limit of 0.007 μM and a linear response in the range of 0.01 to 100 μM. The sensor has been successfully applied to the detection of CAP in tap water and lake water with recoveries of 93.60% to 105.70% and relative standard deviations of less than 2.08%. These results provide new insights on using carbon based electrochemical sensor for rapid detection of CAP in water environment.
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Plasmonics
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2021
·Vol. 17
·期 2
·597-612
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IF 2.404
Li Jian-Jun,Qin Qiu-Xiang,Weng Guo-Jun,Zhu Jian,Zhao Jun-Wu
In this study, Au–Ag nanoboxes are converted into Au–Ag alloy nanocages by increasing the hole size. The extinction spectrum and the refractive index sensing characteristics of Au–Ag alloy nanocages with different geometric parameters are studied by using discrete dipole approximation method (DDA). With the increase of Au composition, the peak of local surface plasmon resonance (LSPR) shows approximately linear redshift and the sensitivity factor shows approximately linear decrease. The refractive index sensitivity can be effectively controlled by the Au–Ag ratio at large hole size because the hole and cavity surfaces distribute more environmental dielectric components. Therefore, increasing the hole size and decreasing the Au–Ag ratio can improve the refractive index sensitivity. These calculation results have also been verified experimentally. In order to illustrate the influence of alloy composition on the LSPR characteristics and the refractive index sensitivity, the local electric field distributions under different geometric parameters are plotted. We find that the electric field direction on the hole and cavity surfaces is controlled by the Au–Ag ratio and environmental dielectric constant. Moreover, the field vectors on the hole and cavity surfaces are formed by the superposition of the incident field, the electric field generated by the oscillating electrons on the outer surface, and the polarized field in the environmental dielectric constant.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2021
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IF 8.067
Feihu Mu,Benlin Dai,Wei Zhao,Shijian Zhou,Haibao Huang,Gang Yang,Dehua Xia,Yan Kong,Dennis Y.C. Leung
To boost the visible light catalytic performance of typical metal-organic frameworks (MOFs) materials (MIL-68(In)-NH 2 ), a novel stable Z-scheme Ag/Ag 3 PO 4 /MIL-68(In)-NH 2 plasmonic photocatalyst was constructed by electrostatic attraction, co-precipitation reaction, and in-situ photoreduction reaction methods for the first time. The photocatalytic activities of the photocatalysts are systematically explored by the photocatalytic degradation of bisphenol A (BPA) and reduction of Cr(VI) under visible light. Ag/Ag 3 PO 4 /MIL-68(In)-NH 2 displays the best photocatalytic performance among the as-prepared photocatalysts. The rate constant of BPA degradation on Ag/Ag 3 PO 4 /MIL-68(In)-NH 2 is 0.09655 min −1 , which is better than many reported photocatalytic materials. It also achieved a maximum rate constant of 0.02074 min −1 for Cr(VI) reduction. The boosted photocatalytic performance is due to the improved absorption caused by localized surface plasmon resonance (LSPR), effective interface charge transfer and separation, and more reactive sites provided by the large specific surface area. Besides, the photocatalytic degradation pathway of BPA is concluded according to GC-MS analysis. Finally, a more reasonable Z -scheme mechanism is speculated and verified through a series of characterizations and simulations, such as time-resolved photoluminescence spectroscopy (TRPL), electron spin resonance (ESR), and finite difference time domain (FDTD) method.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Sihan Ma,Zonglang Zhou,Guang Ran,Jun Xie,Xian Luo,Yipeng Li,Xin Wang,Huiqin Zhuo,Jianghua Yan,Lin Wang
The development of highly efficient photonic nanomaterials with synergistic biological effects is critical and challenging task for public hygiene health well-being and has attracted extensive interest. In this study, a type of near-infrared (NIR) driven, virus-like heterojunction was first developed for synergistic biological application. The Ag-coated Bi 2 CO 5 nanomaterial (BOCO@Ag) demonstrated good biocompatibility, low cytotoxicity, high antibacterial activity and excellent light utilization stability. The synthesized BOCO@Ag performed a potential high photothermal conversion (efficiency~46.81%) to generate high temperatures when irradiated with near-infrared light illumination. As expected, compared to single Ag+ disinfection, BOCO@Ag can exhibit better antibacterial performance when combined with photothermal energy and released Ag+ . These results suggest that BOCO@Ag can be a promising photo-activate antimicrobial candidate and provide security for humans health and the environment treatment.
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JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
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2021
·Vol. 27
·期 3
·655-665
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IF 1.993
Jinyan Hu,Suo Liu,Dingsheng Wu,Dengyu Pan,Quan Feng
As a new advanced oxidation technology, photocatalytic technology has broad application prospects in the field of wastewater treatment. However, in the actual use process, there will be difficulties in catalyst recovery and reuse. This article successfully prepared bacterial cellulose (BC) loaded silver and titanium dioxide nanoparticles (Ag-plated TiO 2 /BC composite pellicle) by in situ embedding method. BC not only works as the carrier to load TiO 2 and Ag NPs but also adsorbs dyes to promote the reaction. As a reusable photocatalytic film, it is convenient to use and recycle in terms of testing and characterization compared with powders. The results show that Ag and TiO 2 nanoparticles were closely embedded in BC. We evaluated the photocatalytic degradation performance of the catalyst on methylene blue (MB), active red X-3B, and Rhodamine B. When the reaction time was 2 h, the dye removal rates were 71%, 68%, and 82.6%. At the same time, through the inhibition zone experiment, it was found that the material has a certain inhibitory effect on both Escherichia coli and Staphylococcus aureus . Therefore, the supported catalyst prepared by this method has the advantages of high catalytic activity, relatively stable property, easy recovery, and tailorability, making it potentially applicable in sewage post-treatment links.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
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IF 4.098
Kaiqiang Wang,Jinjie Li
The fabrication of sensitive and reliable interfacial plasmonic platform for measuring chemical contaminants in various phases is an exciting topic in the food industry and for environment monitoring. In this study, a high-performance surface-enhanced Raman spectroscopy (SERS) analytic platform was developed through self-assembly of the gold@4-mercaptobenzoic acid@silver nanoparticles (Au@4-MBA@Ag NPs) at the cyclohexane/water interface. By addition of the inducer ethanol, the Au@4-MBA@Ag NPs in aqueous phase was effectively migrated to the biphasic interface, forming a large-scale close-packed nanoparticle array. The average gap between adjacent nanoparticles was smaller than 3 nm, where intensive SERS “hot spots” were created for high-sensitive detection. Furthermore, using the sandwiched 4-MBA molecule as the internal standard to correct the Raman signal fluctuations, the point-to-point and batch-to-batch reproducibility of Au@4-MBA@Ag array were improved with lower relative standard deviation (RSD) values of 8.84% and 14.97%, respectively, and pesticides (thiram and thiabendazole) analysis in both aqueous and organic phases were achieved with higher accuracy (R 2 of 0.986 and 0.990) as compared with those without 4-MBA correction (R 2 of 0.867 and 0.974). The high-throughput fabrication of the self-assembled nanoparticle array is a promising approach for development of a sensitive and reliable SERS platform for chemical contaminants monitoring in multiphase.
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