JOURNAL OF FOOD SCIENCE
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2023
·Vol. 88
·期 4
·1769-1780
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IF 3.9
Yumin Chen,Linxuan Zhu,Yuling Yang,Di Wu,Yan Zhang,Weiwei Cheng,Xiaozhi Tang
A high-performance Au@MIL-101/PMMA/DT surface-enhanced Raman scattering (SERS) substrate was fabricated for sensitive and stable detection of paraquat by self-assembling metal organic framework–modified Au nanoparticles (Au@MIL-101) on a poly(methyl methacrylate) (PMMA) film and then immobilizing the formed substrate onto a duct tape (DT). The highly closely packed Au@MIL-101 array provided intensive hotspots for SERS sensing. The MIL-101 layer modified on the surface of Au nanoparticles could absorb paraquat to the electromagnetic enhancement area of Au nanoparticles. The DT on the bottom made the substrate smoother, which is beneficial for achieving a more stable detection performance. As a result, the constructed substrate exhibited outstanding uniformity with relative standard deviations of 9.47% and storage stability for 2 months. For detecting paraquat, the substrate showed a low detection limit of 7.1 × 10 −9 M (1.83 µg/kg) and wide linear range from 10 −8 to 10 −2 M. Furthermore, the substrate showed good detection performance in real cereal samples with desirable recovery rates from 91.57% to 102.32%.
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MATERIALS & DESIGN
·
2023
·
IF 8.4
Xiuli Ren,Linna Chang,Yanan Hu,Xingjun Zhao,Shibo Xu,Zepeng Liang,Xifan Mei,Zhenhua Chen
Bacterial biofilms often hinder the healing of infected chronic wounds. Hence, it is significant to explore ways to destroy bacterial biofilms. In this work, a photothermal therapy strategy of designing Au clusters modified ZIF-8 MOFs ( [email protected] ) as peroxidase-like catalytic nanozyme was proposed for bacterial infected wound healing. Under near-infrared laser (NIR), the prepared [email protected] present enhanced peroxidase-like activity and excellent photothermal response properties. [email protected] achieved bacterial membrane disruption rate of 66.3% and MRSA clearance rate up to 97%. [email protected] also catalyzed endogenous H 2 O 2 to OH and achieved almost 97.4% healing rate in animal experiments. The prepared [email protected] with peroxidase-like catalytic nanozyme properties has great potential in the treatment of infected diabetic wounds through bacterial membranes disruption and protein leakage promotion.
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Nano Research
·
2023
·Vol. 16
·期 5
·6278-6289
·
IF 9.9
Xu Jialun,Zhang Zhihua,Yu Daiyi,Du Wei,Song Nan,Duan Xuezhi,Zhou Xinggui
The catalytic performances over propylene epoxidation with H 2 and O 2 (HOPO process) are significantly affected by the properties (e.g., surface properties, Ti coordination, and morphology) of titanosilicate zeolite. Introducing urea into zeolite synthesis is a simple and convenient method to modify these properties of titanosilicate zeolite. Uncalcined pore-blocked titanium silicalite-1 (TS-1, i.e., TS-1-B) with the lower urea dosage possesses more defective structure and unsaturated coordinated Ti sites verified by 29 Si nuclear magnetic resonance (NMR) and X-ray photoelectron spectroscopy (XPS) analysis, which results in a high initial activity and hydrogen efficiency; while the high surface acidity generated by these Ti species leads to a continuous decrease in the activity and the propylene oxide (PO) selectivity during the reaction. As the amount of urea gradually increases, the TS-1-B samples present the reduced surface defects and defective and unsaturated Ti species. Specially, TS-1-B-0.30U presents the weaker PO adsorption on PO-diffusion reflectance infrared Fourier transform spectra (DRIFTS), and thus results in the high stable PO formation rate and selectivity over its Au catalyst. Furthermore, a flat-plate-like shape with a shorter thickness of 100 nm along the b-axis direction is observed on the urea-modified TS-1. Compared with the conventional ellipsoidal TS-1 with crystal sizes of 200 and 500 nm, the flat-plate-like TS-1-0.30U displays the less surface defects, unsaturated Ti species, and the weaker Lewis acid, which is favorable for the desorption and intracrystalline diffusion of PO, thus reduces the occurrence of side reactions for the improved selectivity and stability. This work may provide a reference for developing titanium-containing materials with high activity and stability over HOPO reaction.
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JOURNAL OF SOLID STATE CHEMISTRY
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2023
·
IF 3.3
Yawen Guan,Shanshan Fu,Wanyu Song,Xueyan Zhang,Bangyu Liu,Fang Zhang,Fang Chai
4-nitrophenol (4-NP) is a harmful aromatic compound to environment. The catalytic hydrogenation of 4-NP was considered as a profitable approach due to the valuable organic intermediate product. High efficiency catalysts are crucial. Herein, Cu–Au bimetallic nanospheres (BNSs) with sea urchin structure were fabricated by tuning the reaction condition and ratio of precursors. The Cu–Au BNSs exhibited effective catalytic activity in the reduction of 4-NP and K 3 [Fe(CN) 6 ]. The optimum catalyst can be determined as the Cu–Au BNSs prepared by 15 mL AA, 4-NP can be reduced to 4-AP in 150 s (k = 3.02 × 10 −2 s −1 ) with TOF value of 0.149 (s −1 ). The reusability of Cu–Au BNSs was evaluated with high effectiveness, the catalytic activity remained negligible loss over 18 cycles with efficiency over 95%, indicated their good reusability, which can be attributed to the synergistic effect of Cu–Au BNSs. The fabrication of bimetallic nanostructures provided an efficient approach to design efficient catalyst.
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IONICS
·
2023
·Vol. 29
·期 5
·1991-2003
·
IF 2.8
Yuhui Cui,Jinghao Lu,Lijuan Yang,Zheng Hao,Runjin Wu,Qian Li,Shijia Xu,Libin Yang
In proton exchange membrane fuel cells (PEMFCs), the most advanced catalysts are mainly carbon loaded with platinum (Pt), but the cathodic catalytic active center is too low to match the oxidation activity and rate at the anode. Co atoms doped into the lattice of Pt alloy change the electronic structure of platinum and reduce the binding energy of oxygen atoms. Au or Rh atoms embedded into the lattice of Pt 3 Co alloy compensate the defect and enhance the activity and rate of the oxygen reduction. Through base on density functional theory (DFT), the adsorption energy for oxygen on Pt 3 Co, Au-Pt 3 Co, and Rh-Pt 3 Co and the segregation energy of Co atoms were calculated. The results show that Au or Rh doped weakens the binding energy of Pt for oxygen on the Pt 3 Co alloy and improves the activity and stability of oxygen reduction. Compared with Rh, the introduction of Au element shows better effects in the electrocatalytic reaction process. Graphical Abstract
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MICROCHEMICAL JOURNAL
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2023
·
IF 4.8
Haixia Hu,Mingqin Wu,Liping Yao,Huiling Deng,Jiang Hu,Yukun Huang,Xiao Yang,Lijun Wang,Xianggui Chen
Recently, aptamer-enhanced nanozyme activity sensing platforms have gained considerable attention in the bioanalytical and diagnostic fields due to their simplified operations, rapid speed of analysis and visual observation convenience. However, the ability of an aptamer to enhance nanozyme activity has thus far been restricted by oligonucleotide type and length, in turn resulting in the typically high limit of detection (LOD) of aptamer-enhanced nanozyme activity sensing platforms. In this study, a novel cytosine-rich single-stranded DNA (C-rich ssDNA) was designed to overcome these drawbacks and, thereby, significantly enhance the peroxidase-like activity of Fe 3 O 4 @Au nanoparticles (NPs). The ability of this C-rich ssDNA to enhance the peroxidase-like activity of Fe 3 O 4 @Au NPs was shown to be 30% more effective than aptamers. To verify this outstanding performance, a C-rich ssDNA-enhanced Fe 3 O 4 @Au NPs activity sensing platform was developed for the detection of Salmonella Typhimurium ( S. Typhimurium). Under optimum conditions, the novel colorimetric method realized quantitative S. Typhimurium determination ranging from 2.8 × 10 1 to 2.8 × 10 6 CFU/mL, with an ultralow detection limit of 1.8 CFU/mL. Additionally, the feasibility of the proposed colorimetric method was validated in spiked lettuce and milk, with LODs of 2.7 and 3.2 CFU/mL, respectively. These results indicate the significant potential of this novel colorimetric method for effective S . Typhimurium detection in food samples.
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Reaction Chemistry & Engineering
·
2023
·Vol. 8
·期 8
·1981-1992
·
IF 3.9
Li Sun,Mengying Sun,Yuan Zhi,Hua Zhang,Yuejin Shan,Binlin Dou,Jian Chen,Lixin Zhang
The continuous-flow (C-F) reduction process has been limitedly applied in the treatment of dyeing wastewater owing to the weak catalytic performance of the reactors employed. In this work, a small tubular packed reactor and its module are designed, fabricated and used for the C-F reduction of nitro and azo compounds in dyeing wastewater. Here, Au–Co–CoOx-coated glass beads with superior catalytic activity are chosen as packing materials, prepared without any toxic chemical agents. By means of the reactor, 4-nitrophenol (4-NP) can be completely removed and its removal rate is determined to be 100 μmol h−1. After that, a novel strategy for the tandem module is proposed to further enhance the removal rate of 4-NP. Based on the tandem module, the removal rate of 4-NP can be dramatically boosted to 1900 μmol h−1. Meanwhile, the rate constant for the C-F reduction of 4-NP can reach up to 0.44 s−1. Furthermore, the tandem module displays satisfactory operating stability, reusability and reliability in real water samples. In addition, the tandem module first achieves the C-F reduction of 2-nitrophenol, 3-nitrophenol, methyl red and methyl orange. Clearly, the reactor and its module can effectively extend the application of the C-F reduction process in dyeing wastewater treatment.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Yu Xiao,Na Huang,Jiahui Wen,Dan Yang,Huanhuan Chen,Yijuan Long,Huzhi Zheng
Fluorescent bovine serum albumin-protected gold nanoclusters ( [email protected] NCs) can catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to produce blue oxTMB for its peroxidase-like activity. The two absorption peaks of oxTMB overlapped with the excitation and emission peaks of [email protected] NCs, respectively, causing efficient quenching on the fluorescence of [email protected] NCs. The quenching mechanism can be attributed to the dual inner filter effect (IFE). Based on the dual IFE, [email protected] NCs were utilized as both peroxidase mimics and fluorescent reporters for H 2 O 2 detection and further for uric acid detection with uricase. Under optimal detection conditions, the method can be used to detect H 2 O 2 ranging 0.50–50 μM with a detection limit of 0.44 μM and UA ranging 0.50–50 μM with a detection limit of 0.39 μM. The established method had been successfully utilized for the determination of UA in human urine, with massive potential in biomedical applications.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 12
·33587-33597
·
IF 5.19
Zhang Ying,Zhang Shici
A series of porous photocatalysts, Au-carbon-doped ZnO (Au/C/ZnO), were synthesized successfully via calcination using MOF-5 as template, with the matrix impregnated with Au nanorods through the seed-mediated method. The catalytic performance was investigated by the photodegradation of tetracycline hydrochloride (TC-HCl). Ninety percent of TC was degraded by Au/C/ZnO sample within 360 min under visible light, showing an efficient photocatalytic activity. The enhanced activity was mainly ascribed to the effect of oxygen vacancies produced by C doping during calcination process of MOF-5 and Au nanorods. The density functional theory (DFT) calculation shows that due to the intermediate energy level, the electron–hole pairs generated by photoelectricity transition were transitioned from valence band (VB) to the intermediate energy level, and further to the conduction band (CB) under irradiation. Thus, the separation efficiency of photogenerated carrier was improved in this process. Meanwhile, the surface plasmon resonance (SPR) and electromagnetic field effect of Au nanorods which were loaded on the C/ZnO promoted the separation efficiency of change carriers, and this process also provided more hot electrons for free radicals generation. This work provides an efficient method for the design and synthesis of noble metal– and non-metal-doped oxide photocatalysts and provides an effective photocatalytic technique for the antibiotic degradation under visible light, which possesses the huge application potential in the environmental purification.
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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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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Gaozhi Ou,Anshun Zhao,Hui Liao,Zhaowei Zhang,Fei Xiao
Aflatoxin in food is a significant concern that threatens human health and life and causes a heavy burden on international trade and healthcare. In this work, we developed a new type of label-free electrochemical immunosensor for the high-sensitivity determination of aflatoxin B1 (AFB1) based on Au nanoparticles decorated urchin-like Bi 2 S 3 (Au/Bi 2 S 3 ) anchored on electrochemically reduced graphene oxide (ERGO) modified carbon fiber (CF) microelectrode (Au/Bi 2 S 3 /ERGO/CF). The morphology and characterization of the modified microelectrode were investigated using scanning electron microscopy (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). Under the optimum conditions, the label-free electrochemical immunosensor detected AFB1 within the linear range of 10 pg mL −1 to 20 ng mL −1 , with a low detection limit of 8 pg mL −1 and high sensitivity (0.48 μA/ng mL). The immunosensor showed high selectivity, good reproducibility, and acceptable stability. The immunosensor was applied to detecting AFB1 in cornflour samples, offering excellent reliability and accuracy compared with typical detection methods. Finally, this platform provides a superior prospect for the development of a nanohybrid immunosensor.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Wenxuan Wang,Yanwei Zhang,Jingjing Xie,Yanze Wang,Shaowen Cao,Hang Ping,Zhaoyong Zou,Hui Zeng,Weimin Wang,Zhengyi Fu
Natural photosynthesis involves an efficient charge-transfer pathway through exquisitely arranged photosystems and electron transport intermediates, which separate photogenerated carriers to realize high quantum efficiency. It inspires a rational design construction of artificial photosynthesis systems and the architectures of semiconductors are essential to achieve optimal performance. Of note, biomineralization processes could form various mesocrystals with well-ordered superstructures for unique optical applications. Inspired by both natural photosynthesis and biomineralization, we construct a ternary superstructure-based mesocrystal TiO2 (meso-TiO2)/Au/CdS artificial photosynthesis system by a green photo-assisted method. The well-ordered superstructure of meso-TiO2 and efficient charge-transfer pathway among the three components are crucial for retarding charge recombination. As a result, the meso-TiO2/Au/CdS photocatalyst displays enhanced visible light-driven photocatalytic hydrogen evolution (4.60 mmol h–1 g–1), which is 3.2 times higher than that of commercial TiO2 (P25)/Au/CdS with disordered TiO2 nanocrystal aggregates (1.41 mmol h–1 g–1). This work provides a promising bioinspired design strategy for photocatalysts with an improved solar conversion efficiency.
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