CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2023
·
IF 3.9
Wanyi Tao,Bo Zhang,Luxia Yin,Xiao Teng,Zhang Wen,Zekai Zhang,Wensheng Ning
Fabrication of adsorbent can play an important role in the adsorption desulfurization technology as a most promising deeply desulfurization technology. Ag 2 O/CeO 2 /SiO 2 aerogel composites were synthesized, where the easy oxidation of Ce 3+ into Ce 4+ was realized by adding hydrogen peroxide, and were utilized to remove thiophenics from model fuels and aromatics. Compared with Ag 2 O/SiO 2 and CeO 2 /SiO 2 , the adsorption uptake and solvent washing regeneration performance of Ag 2 O/CeO 2 /SiO 2 for thiophene was obviously enhanced, and the adsorption selectivity for thiophene in the presence of aromatics was relatively close to CeO 2 /SiO 2 , attributed to that Ag 2 O/CeO 2 /SiO 2 adsorbed thiophenics via the π-Ag + complexation and S-Ce bonding, where the latter was main interaction. However, there was no synergistic interaction between Ag and Ce species acted as adsorption sites in the Ag 2 O/CeO 2 /SiO 2 , which could be supported by that the chemical state of Ag and Ce in Ag 2 O/CeO 2 /SiO 2 was consistent with corresponding one in Ag 2 O/SiO 2 and CeO 2 /SiO 2 , respectively. Among Ag 2 O/CeO 2 /SiO 2 aerogel composites with different molar ratios of Si/Ce, Ag 2 O/CeO 2 /SiO 2 -50 performed the best, its adsorption uptake for thiophene, benzothiophene and dibenzothiophene from model fuels arrived at 20.4, 21.8 and 27.2 mg-S/g ads , respectively. Langmuir and Freundlich adsorption isotherm models, the pseudo-second-order kinetic model could well describe the adsorption of thiophenics over Ag 2 O/CeO 2 /SiO 2 -50.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Dongzhen Chen,Jianzhao Gao,Dan He,Jingshun He,Yang Li,Meng Zhang,Wenya Li,Xin Chen,Xinhai He,Tao Fu
Wearable, noninvasive, and simultaneous sensing of subtle strains and eccrine molecules on human body is essential for future health monitoring and personalized medicine. However, there is a huge chasm between biomechanics and bio/chemical molecule detections. Here, a wearable plasmonic bridge sensor with multiple abilities to monitor subtle strains and molecules is developed. Hollow Au–Ag nano-rambutans and carbon nanotubes (CNTs) are adsorbed in the nonwoven fabrics (NWFs) conjointly, where the gap between the conducting network of CNTs is bridged by the Au–Ag nano-rambutans during the subtle strain sensing, and the detection sensitivity for stress is improved at least 1 order of magnitude compared to that with the only CNTs. In order to acquire the accurate human action recognition, a machine learning algorithm (support vector machines) based on output biomechanics data is designed. The average accuracy of our plasmonic bridge sensor reaches 89.0% for human action recognition. Moreover, due to the hollow structure and high nanoroughness, the single Au–Ag nano-rambutan particle has strong localized surface plasmon resonance effect and high surface-enhanced Raman scattering (SERS) activity. Based on their unique SERS spectra introduced by the hollow Au–Ag nano-rambutan adsorbed in the NWFs, noninvasive extraction and “fingerprint” recognition of bio/chemical molecules could be realized during the wearable sensing. In sum, the NWFs/CNTs/Au–Ag sensor bridges the barrier between the bodily strain detection and molecule recognition during the wearable sensing. Such integrated and multifunctional sensing strategy for universal biomechanics and bio/chemical molecules means to assess human health to be of importance.
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高影响因子
MOLECULES
·
2022
·Vol. 27
·期 20
·6951
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IF 4.927
Yujie Tao,Fang Zhou,Kaixin Wang,Dequan Yang,Edward Sacher
Although a facile route to prepare AgCu nanoalloys (NAs) with enhanced antibacterial efficacy using Ag NP catalysis of Cu ions at elevated temperatures was previously developed, its detailed reaction process is still unclear due to the fast reaction process at higher temperatures. This work found that AgCu NAs can also be synthesized by the same process but at room temperature. AgCu NAs formation kinetics have been studied using UV–Visible spectra and Transmission Electron Microscopy (TEM), where formation includes Cu2+deposition onto the Ag NP surface and Ag+release, reduction, and agglomeration to form new Ag NPs; this is followed by a redistribution of the NA components and coalescence to form larger AgCu NPs. It is found that SPR absorption is linear with time early in the reaction, as expected for both pseudo-first-order (PFO) and pseudo-second-order (PSO) kinetics; neither model is followed subsequently due to contributions from newly formed Ag NPs and AgCu NAs. The antibacterial efficacy of the AgCu NAs thus formed was estimated, with a continuous increase over the whole alloying process, demonstrating the correlation of antibacterial efficacy with the extent of AgCu NA formation and Ag+release.Keywords:Ag nanoparticles;AgCu nanoalloys;antibacterial efficacies;reaction kinetics
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Mei Liu,Lingcheng Zheng,Jiale Deng,Juan Gao,Kangrui Su,Xile Sheng,Jie He,Deqiang Feng,Lei Guo,Changzhao Chen,Yang Li
Constructing highly efficient, stable and wide applicable photocatalysts with simple and controllable components to confront the environmental issue need sustained efforts. In this work, Ag nanoparticles decorated AgBr/BiVO 4 shell/core heterojunction (Ag@AgBr/BiVO 4 ) was synthesized, which showed high photocatalytic activity in removing rhodamine B (RhB, 99.1 % in 20 min) and tetracycline (TC, 94.1 % in 20 min) under visible-light irradiation. The band structure was determined based on the light absorption spectra and Mott-Schottky test. The free radical scavenger test showed the production of ·OH and ·O 2 − radicals which accelerated the photodegradation. Basing on these results, the enhanced photocatalytic performance can be attributed to AgBr/BiVO 4 shell/core heterojunction that spatially separates the photogenerated carriers and inhibits bulk recombination. The localized surface plasmon resonance (LSPR) effect of Ag particles also improved the light absorption ability of the photocatalyst and effectively produce excess active species to accelerate the photodegradation of contaminants. The results show a coordinated regulation of Ag nanoparticles and AgBr/BiVO 4 shell/core heterojunction to achieve high photocatalytic properties, the strategy of rational designing structure and energy band alignment may also offer a new insight for the applications in solar energy conversion field.
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JOURNAL OF FOOD AND DRUG ANALYSIS
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2022
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IF 6.157
Wenwen Chen,Qiang Chen,Wei Zhang,De Zhang,Zhi Yu,Ying Song,Xiubing Zhang,Dejiang Ni,Pei Liang
The problem of aflatoxin contamination emerged gradually in the field of food safety. Surface-enhanced Raman spectroscopy (SERS) is an ultra-sensitive and non-destructive spectroscopy technology with extensive application prospects in the detection field. In this paper, with the detection of AFB1 as the target, Au@Ag NPs substrate with uniform morphology and strong SERS effect was prepared. Furthermore, the intermediates formed by hydrogen bonding between AFB1 and melamine facilitate the binding of toxin molecules to the substrate. Moreover, the AFB1-melamine-Au@Ag NPs detection system was established by optimizing the melamine dosage, and the limit of detection can reach 10 −8 mol/L (M). In this method, AFB1 (concentration range of 10 −4 M – 10 −7 M) in tea oil, the Raman signal intensity of AFB1 shows an excellent linear, logarithmic relationship, and the correlation coefficient is 0.9685. Therefore, this work has achieved simple, sensitive, and stable AFB1 detection and has broad application potential in food safety detection.
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高影响因子
Materials Chemistry Frontiers
·
2023
·Vol. 7
·期 6
·1100-1109
·
IF 7
Suyang Li,Junjie Chen,Wanbing Xu,Biao Sun,Jiechen Wu,Qiang Chen,Pei Liang
Bimetallic gold core–silver shell (Au@Ag) surface-enhanced Raman scattering tags draw broad interest in the fields of biological and environmental analyses. Herein, an efficient hybrid microfluidic chip was designed to prepare uniform Au@Ag core–shell nanoparticles, and DTNB was used as the internal standard tag molecule to prepare Au@DTNB@Ag for SERS detection. Homogeneous core–shell nanoparticles with a particle size of 90 nm were prepared by mixing a silver precursor and a gold core in a microfluidic chip. The relative standard deviation (RSD) of the particle size distribution was close to 10%, and the detection limit of 4-MBA was as low as 10-10 M. In order to solve the influence of SERS signal fluctuation, a uniform Au@DTNB@Ag core–molecule–shell structure was synthesized in a microfluidic chip, and the characteristic peak of the analyte was corrected by the relative intensity of the DTNB characteristic peak (1335 cm−1). The experimental results showed that the SERS detection was achieved with high reproducibility, and the SERS peak intensity had a good linear correlation with the concentration. The homogeneous SERS substrate prepared using a microfluidic chip has potential for sensitive and reliable detection of environmental chemical contaminants.
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ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Yanqing Cong,Jiaxin Yi,Shengna Liang,Feng Zhang,Yi Zhang,Shi-Wen Lv
Bimetallic oxides with spinel structure show great prospects in the photocatalysis owing to many active sites. Herein, a novel 500NiCo 2 O 4 @CdS–5%Ag composite was fabricated via a feasible strategy. Interestingly, the combination with NiCo 2 O 4 could significantly enhance the absorption ability of CdS for visible light. Benefiting from the formation of heterojunction structure between NiCo 2 O 4 and CdS, the recombination of photogenerated electrons and holes was remarkably restrained. As an effective mediator, deposition of Ag could further promote the transfer of photogenerated charge carriers, thereby accelerating the reaction rate. Meanwhile, light absorption capacity of composite was also improved, owing to the surface plasmon resonance effect of metallic Ag. More importantly, 500NiCo 2 O 4 @CdS–5%Ag composite with great stability displayed an excellent performance in the photocatalytic degradation of OFX, and its highest removal efficiency was as high as 99.14%. Possible degradation pathways of OFX were given, and most of OFX could be degraded into CO 2 , H 2 O and other by-products with no toxicity. Significantly, the separation and transfer of photogenerated charge carriers followed indirect Z-scheme heterojunction mechanism. The O 2 − , OH and 1 O 2 were main active species in photocatalytic reaction system. All in all, current work inspired some new ideas for designing novel photocatalytic system in wastewater treatment .
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 26
·39638-39648
·
IF 5.19
Liu Suo,Wu Dingsheng,Hu Jinyan,Zhao Lingling,Zhao Lei,Yang Maohuan,Feng Quan
It is necessary to effectively separate photocatalytic materials from water bodies and reuse catalysts for industrial wastewater treatment. Herein, a novel nanofiber membrane with enhanced light absorption and reusability of photocatalytic materials was prepared. The three-dimensional porous structure of the nanofibers helps the photocatalyst efficiently degrade pollutants. Specifically, a high-efficiency photocatalyst carrier with a nanofiber structure (PAN/PU/β-CD@Ag nanofiber membrane) was prepared by electrospinning and a simple silver plating process, and then ZnO NPs were synthesized in situ on the nanofiber membrane during the hydrothermal process. Under visible-light irradiation, the ZnO-loaded PAN/PU/β-CD@Ag nanofiber membranes exhibited excellent photocatalytic performance for the degradation of methylene blue (MB, 71.5%) and tetracycline hydrochloride (TCH, 70.5%). Additionally, a possible pathway of charge migration in this system was proposed. This design may provide a new idea for the preparation of visible-light photocatalytic nanofiber membranes and their treatments of wastewater containing dyes and hormones.
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Journal of Energy Storage
·
2022
·
IF 8.907
Shikun Xiao,Xiaowu Hu,Xiongxin Jiang,Qinglin Li
In order to solve the problem of low thermal conductivity of hierarchical porous carbon-based (HPC) composite phase change materials, a new method was proposed in this paper, in which HPC was modified with polydopamine (PDA) and silver nanoparticles successively, and then incorporated with polyethylene glycol (PEG) to form shape-stabilized phase change composite material (SSPCM). The HPC was prepared by self-sacrificing template method using sucrose and sodium bicarbonate as starting materials. The micro structure, thermal conductivity, thermal stability, chemical compatibility and Photo-thermal conversion capability of the SSPCM were analyzed. The results showed that the SSPCM prepared from the support material modified by PDA and silver nanoparticles still had good chemical compatibility. Besides, the thermal conductivity of SSPCM was significantly improved by 58% compared to the original material, showing superior thermal properties. It was worth noting that the photo-thermal conversion capability of the SSPCM was significantly higher than that of the original material. The SSPCM synthesized on the basis of functionalized hierarchical porous carbon had promising applications in photo-thermal conversion and thermal energy storage and transformation.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yonghou Xiao,Jiahui Fu,Heyang Zhu,Qidong Zhao,Liang Zhou
The diffusion limitation owing to the long and narrow pore structure in traditional ZSM-5 zeolite could restrain the adsorptive desulfurization performance towards thiophene sulfur compounds from fuels. Herein, ZSM-5 zeolite nanocrystals were successfully fabricated using steam-assisted gel crystallization strategy to control the size of zeolite particles within 70 ∼ 160 nm. Compared to traditional micron ZSM-5, ZSM-5 zeolite nanocrystals could effectively reduce the diffusion pathway, enlarge the specific surface area, and increase exposure of adsorption sites, which could enhance the desulfurization performance. ZSM-5 nanocrystals with a mole ratio SiO 2 /Al 2 O 3 of 200 exhibited a satisfactory desulfurization efficiency, and the breakthrough capacity attained 0.0509 mmol S/g adsorbent. After ZSM-5 nanocrystals were ion-exchanged with NH 4 + and Ag + , both mesoporous characteristics and the Lewis acid (L-acid) sites were enhanced, which promoted the adsorption desulfurization performance. Furthermore, nanocrystalline ZSM-5 and Ag/ZSM-5 also exhibited acceptable regeneration performance. This study is expected to provide an effective strategy and a facile method to prepare nanocrystalline ZSM-5 based adsorbents for the development of efficient desulfurization materials.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Boqiang Gao,Koukou Tao,Zhonghua Xi,Mayyada M.H. El-Sayed,Tamer Shoeib,Hu Yang
In this work, a 3D lignosulfonate composited poly(vinyl formal) (PVF) sponge impregnated by BiVO 4 /polyaniline (PANI)/Ag ternary photocatalyst (PLS-BiVO 4 /PANI/Ag) was designed and fabricated. The synergistic adsorption-photodegradation of five fluoroquinolones (FQs) antibiotics onto PLS-BiVO 4 /PANI/Ag was investigated. Incorporating lignosulfonate as a carrier on PVF sponge improved its structural properties and enhanced its adsorption performance toward FQs. The BiVO 4 /PANI/Ag ternary photocatalyst was well-dispersed and tightly bound to the composited sponge, thus it efficiently degraded the adsorbed FQs through surface photodegradation. PLS-BiVO 4 /PANI/Ag achieved >90% removal efficiency for all examined FQs within 2.0 h in a batch system, while it maintained a steady 80% removal efficiency for 30.0 h in a continuous dynamic treatment system. Photoelectric characterizations and ESR results showed that BiVO 4 /PANI/Ag was consistent with the type II heterostructure and effectively improved the utilization of visible light and the separation of photogenerated electron-hole pairs. The hole was the dominant active species in the degradation of FQs, while the main degradation pathways included defluorination, decarboxylation and destruction of piperazine ring. The prepared composited sponge is thus characterized by its high performance, convenient operation, eco-friendliness, and practicality in real water treatment systems since it undergoes self-purification and is easily recovered from water without mass loss.
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POLYMER
·
2022
·
IF 4.432
Yongjiang Li,Xiaoyan Ma,Jingyu Ma,Zongwu Zhang,Zhaoqi Niu,Fang Chen
A new facile fabrication process of the polymer/Ag core-shell microspheres is demonstrated via the reverse breath figure method accompanied by in situ reduction. In contrast to traditional approaches, which require the prior preparation of polymer microspheres, the star-shaped polyhedral oligomeric silsesquioxane (POSS) amphiphilic block copolymers solution containing AgNO 3 is cast under ethanol vapor for the formation of polymer/AgNO 3 core-shell microspheres in one step. The influence of polymer molecular structures, solvent, non-solvent and metal salt on the morphology of polymer microspheres was analyzed. Then the AgNO 3 can be reduced in situ to form Ag nanoparticles on the surface of polymer microspheres, which resulted in the formation of polymer/Ag core-shell microspheres. The reduced Ag nanoparticles were homogeneously deposited on the surfaces of polymer microspheres, which can exhibit good performance in the surface-enhanced Raman scattering (SERS). The polymer/Ag core-shell microspheres substrate showed a high detection sensitivity (enhancement factor 2.49 × 10 6 ) with excellent uniformity and reproducibility for Rhodamine 6G (R6G) (relative standard deviation of the intensity at 612 cm −1 was 6.19%＜20%). The proposed strategy is facile to implement and thus a promising new method for the preparation of polymer/metal core-shell microspheres.
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