SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Hongding Zhang,Sifei Wu,Mengwei Sun,Jiaoyu Wang,Man Gao,Hai-Bo Wang,Linxia Fang
Glutathione (GSH)-switched fluorescent assays have appealed much attention due to rapid signal changes of fluorescent probes. However, exposure to exterior environment of fluorescent probe causes photobleaching and premature leakage, leading to low sensitivity and poor photostability. Herein, luminescent SiO 2 nanoparticles encapsulated with Ru(bpy) 3 2+ ( [email protected] 2 ) were designed and synthesized as fluorescent probe to construct a GSH-switched fluorescent assay. The encapsulation of Ru(bpy) 3 2+ in the SiO 2 nanoparticles could effectively prevent the leakage of Ru(bpy) 3 2+ molecules, improving the photostability of probe. The fluorescence of [email protected] 2 nanoparticles was quenched by coating MnO 2 nanoparticles on [email protected] 2 surface ( [email protected] 2 @MnO 2 nanocomposites) through an in situ growth approach, which reduced background of the assay. The MnO 2 nanoparticles not only further inhibited the leakage of Ru(bpy) 3 2+ molecules, but also could serve as a recognition unit of GSH. In the presence of GSH, the MnO 2 nanoparticles on the surface of [email protected] 2 nanoparticles were reduced to Mn 2+ , resulting the fluorescence recovery of [email protected] 2 nanoparticles. Thus, a signal-on fluorescent strategy was constructed for GSH detection. The assay displayed good analytical performance for GSH detection with a low detection limit of 16.2 nM due to excellent fluorescence quenching ability of MnO 2 nanoparticles and special role of [email protected] 2 nanoparticles to block probe leakage. The proposed assay was also applied to measure GSH levels in human serum samples. This work paves a new way to detect GSH with high sensitivity.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Ying Li,Hua-Xu Ling,Yu Gao,Shuo Zhang,Bing Yan
The application of the excellent luminescence properties of lanthanide β-diketonate complex in water systems is the focus of the research in this field. We introduced the lanthanide β-diketonate complex into the framework of polyionic liquid (PIL) and SiO2 to prepare a lanthanide complex hybrid material fluorescent probe SiO2@PIL-Eu(nta)4, which can be used for the detection of bovine hemoglobin in water. Hydrophilic polyionic liquid grafted with SiO2 nanoparticles was the template of the hybrid material. The lanthanide complex was introduced into the prepared spherical polyionic liquid brushes by ion exchange. The obtained products were characterized by Fourier transform infrared spectra (FT-IR), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), nuclear magnetic resonance (NMR), ultraviolet–visible (UV–vis) spectroscopy, and luminescence spectroscopy. The PIL matrix improved the fluorescence lifetime and quantum efficiencies of the lanthanide complex. The as-synthesized hybrid material was employed as a fluorescent probe for the bovine hemoglobin detection in an aqueous solution and the limit of detection is 0.0803 mg/mL. The addition of H2O2 can intensify the quenching of the fluorescent probe. In addition, we analyzed and discussed the quenching mechanism of the probe. The bovine hemoglobin can quench the fluorescence of the probe with the inner filter effect. In the presence of both H2O2 and bovine hemoglobin, the structure of the probe is oxidized by the superoxide anion in the system and the fluorescence of the probe is quenched by the mechanism of static quenching.
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 21
·3852-3858
·
IF 3.756
Runze Guo,Yufeng Liu,Yongzheng Fang,Zhifu Liu,Langping Dong,Lei Wang,Wenyao Li,Jingshan Hou
CsPbI3 has the least chemical stability among the CsPbX3 (X = Cl, Br, and I) perovskite nanocrystal (PNC) family due to its thermodynamically metastable characteristics, thus limiting the development of all-inorganic perovskite white-light devices. The current study presents a microfluidic-based continuous large-scale fabrication of CsPbI3-mesoporous SiO2 (CPI/m-SiO2) nanocomposites to solve the problem of large-scale continuous production of stable, repeatable, high-quality perovskite NCs. The results reveal that the chemical stability and thermal quenching behaviour of CPI PNCs were greatly improved due to the protection of mesoporous silica. Particularly, the water resistance property of CPI/m-SiO2 nanocomposites improved two-fold compared to that of noncomposite CPI PNCs, and the thermal stability of the CPI/m-SiO2 nanocomposites improved nearly three-fold at 373 K when compared with that of the noncomposite CPI NCs. Furthermore, photons were speculated to transmit along with the pores and channel structure of m-SiO2 to reduce photon absorption between NCs. Moreover, the microfluidic technology can operate continuously and is precisely controllable, enabling large-scale nanocomposite synthesis with uniform size and shape.
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Jingwen Li,Qian Wang,Chengyi Xiong,Qianchun Deng,Xiuhua Zhang,Shengfu Wang,Miao-Miao Chen
Mycotoxins contamination, especially aflatoxin B1 (AFB1) in edible oils, is a health hazard. Therefore, AFB1 trace analysis methods are urgently needed. Electrochemiluminescence (ECL) is a popular sensing method because of its low background interference and high sensitivity. However, existing ECL assays for AFB1 detection are based on aqueous rather than oil systems. Herein, we report a CH 3 NH 3 PbBr 3 quantum dots (MAPB QDs)@SiO 2 -based ECL sensor for AFB1 quantification in corn oil using an organic electrolyte. The luminophore loading and stability of the MAPB QDs@SiO 2 particles were significantly improved compared to those of bulky MAPB materials, resulting in an enhanced ECL response. Further, exploiting molecular imprinting technology, an ECL sensor for AFB1 detection with an ultra-low detection limit of 8.5 fg/mL was prepared. The reliability of the sensor was confirmed by comparable recoveries of corn oil samples with those obtained by high-performance liquid chromatography, indicating its potential for food safety evaluation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2022
·Vol. 41
·期 6
·2094-2107
·
IF 6.318
Xu Chong,Zhou Qin,Huang Wei-Ya,Yang Kai,Zhang Yong-Cai,Liang Tong-Xiang,Liu Zhao-Qing
A series of Z-scheme β-Bi 2 O 3 /ZrO 2 heterojunction composites containing three-dimensional (3D) mesoporous silica nanospheres (MSNs) were synthesized as efficient catalysts for antibiotic remediation. The obtained MSN/β-Bi 2 O 3 /ZrO 2 ternary composites possess novel lamellar cross structure, which is well constructed by β-Bi 2 O 3 nanosheets, 3D MSNs, and ZrO 2 nanoparticles. The optimal sample BZS-2 (Bi: Zr: Si = 1: 0.4: 0.33) shows an adsorptive-photocatalytic removal efficiency of 92.7% towards levofloxacin (LVF) and a total organic carbon (TOC) removal efficiency of 60.0% under simulated solar light irradiation for 100 min. BZS-2 can also remove 90.1% and 91.2% of tetracycline hydrochloride (TC) and oxytetracycline hydrochloride (OTC), respectively, and the maximum adsorption capacity of TC over BZS-2 is almost 10 times that of β-Bi 2 O 3 . The improvement of photocatalytic activity can be mainly attributed to the enhanced visible-light adsorption capacity and more efficient separation of photogenerated electron–hole pairs. A possible Z-scheme photocatalytic mechanism of β-Bi 2 O 3 /ZrO 2 heterojunctions based on valence band offset (Δ E VBO ) and conduction band offset (Δ E CBO ) is proposed. This study provides an efficient way to construct novel mesoporous ternary photocatalyst with increased accessible surface area and active sites for treatment of antibiotics by synergistic adsorption and photocatalysis. Graphical abstract
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Shan Wang,Mingfei Pan,Kaixin Liu,Xiaoqian Xie,Jingying Yang,Liping Hong,Shuo Wang
A molecularly imprinted sensor for highly sensitive and selective determination of dibutyl phthalate (DBP) was fabricated by combining multi-walled carbon nanotubes (MWCNTs) and Au nanoparticles (AuNPs) with surface molecularly imprinted polymer (SMIPs). The MWCNTs and AuNPs were designed to modify the electrode surface to accelerate the electron transfer rate and enhance the chemical stability. SMIPs were synthesized using SiO 2 microspheres as carriers. By loading SMIPs capable of identifying DBP on the surface of modified electrodes of MWCNTs and AuNPs, an electrochemical sensor for detecting DBP was successfully constructed. After optimizing the experimental conditions, the modified electrode SiO 2 -COOH@MIP/AuNPs/MWCNTs/GCE can recognize DBP in the range of 10 −7 g L −1 to 10 −2 g L −1 , and the detection limit achieved to 5.09 × 10 −9 g L −1 (S/N = 3). The results demonstrate that the proposed MIP electrochemical sensor may be a promising candidate electrochemical strategy for detecting DBP in complex samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
THERMOCHIMICA ACTA
·
2023
·
IF 3.5
Lei Liu,Runfeng Li,Min Guo,Linjun Wang,Mei Zhang
In this manuscript, CuS-ZnS/SiO 2 @n-octadecane nanocapsules were prepared by a simple one-step Cu 2+ and Zn 2+ co-deposition method. The results of XRD, SEM, TEM, FTIR and XPS show that nanocapsules composed of CuS-ZnS/SiO 2 shell and n-octadecane core material were successfully prepared, and the particles deposited was proved to be composite structure of CuS-ZnS. The solution concentration, reaction temperature and pH value have significant effects on the morphology of the nanocapsules prepared. The appropriate conditions are 0.02 mol/L CuSO 4 , 0.02 mol/L Zn(CH 3 COO) 2 , 60 °C, and no additional pH adjustment. Under the optimum conditions, the melting enthalpy reached 45.11 J/g, and after 100 times of cold and hot cycles, the melting enthalpy of the sample only decreased by 3.2%, showing good thermal stability. The CuS-ZnS composite structure makes CuS-ZnS/SiO 2 nanocapsules exhibit a wider spectrum absorption performance. The absorption effect of CuS-ZnS/SiO 2 nanocapsules to ultraviolet light is significant, compared to the slight reducing of the visible light, while the absorption of near-infrared light is strong. The photothermal conversion efficiency of the samples is significantly improved from 9.7% to 86.6%. Hence, the prepared nanocapsules achieve full spectral absorption, which has a broad application prospect in solar thermal utilization.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 19
·13142-13155
·
IF 3.9
Jiancheng Li,Chi Wang,Yixing Ma,Kai Li,Yi Mei
A new heterojunction material BP/RP-g-C3N4/SiO2 was obtained by a one-step ball milling method, and its photocatalytic capacity was researched by the degradation of Rhodamine B (RhB) and ofloxacin (OFL) in simulated sunlight. The construction of an in situ BP/RP heterojunction can achieve perfect interface contact between different semiconductors and effectively promote the separation of photogenerated carriers. The composite material was well characterized, which proved that the multi-heterogeneous structure was prepared. Furthermore, the type II heterojunction was formed between the g-C3N4 and BP/RP interface, playing an important role in the degradation and promoting electron transfer. The degradation effect of BP/RP-g-C3N4/SiO2 on RhB reached 90% after 26 min of simulated solar irradiation, which was 1.8 times that of g-C3N4/SiO2. The degradation of OFL by BP/RP-g-C3N4/SiO2 reached 85.3% after illumination for 50 min, while the degradation of g-C3N4/SiO2 was only 35.4%. The mechanisms were further discussed, and ˙O2− and h+ were found to be the main active substances to degrade RhB. The catalyst also revealed distinguished stability of catalyst and recyclability, and the degradation effect of RhB can still realize 85% after 4 runs of experiment. Thus, this study provided a novel method for the design and preparation of multi-heterojunction catalysts in the removal of organic pollutants from wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Yaqi Yao,Xiaoqian Wu,Bo Chen,Zhiyu Tu,Oliver Y. Gutiérrez,Ying Cui,Jie Wang,Jiacheng Huang,Yan Xu,Han Sun,Haijun Chen,Zhenxin Yan,Donghai Mei,Yujun Zhao,Johannes A. Lercher
Hydrogenation of aliphatic esters to natural alcohols is an important strategy for the efficient utilization of biomass-derived oils. The synthesis of highly active copper (Cu)-based catalysts is a challenge for condensed-phase ester hydrogenation due to the difficulties in controlling active sites and catalyst deactivation. Here, a copper-based catalyst confined in a carbon nanocage reactor was successfully designed and prepared. The copper catalyst with 56 wt % SiO2 exhibited the best performance because of the optimum proportion of Cu+ and Cu0 sites and high dispersion. The interaction between SiO2 and Cu particles contributes to the formation of Cu+ species, which is the key site for the adsorption of carbonyl groups. Meanwhile, the confinement effect of the carbon nanocages effectively inhibited the agglomeration of the copper particles. The catalysts exhibited not only excellent thermal stability but also superior methanol resistance in comparison with the Cu/SiO2 catalyst. On the basis of the density functional theory (DFT) calculations results, methanol resistance should be attributed to the fewer hydroxyl groups on the catalyst surface, which increase the activation barrier for the dissociation of silica, allowing the stable holding of the copper species in the methanol solvent.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Bin Xu,Maohua Hou,Qinqin Xu,Jieying Su,Haitao Zhang,Xiaohui Lu,Zhongjin Ni
In recent years, artificial amorphous photonic structure (APS) materials with high color saturation and angle independence have been competitively reported. However, there is a lack of research into their functionalization and application in practical environments. Here, with practical applications in mind, we prepared APS pigments based on CB@SiO2@TiO2 core–bishell nanospheres and demonstrated high color saturation, enhanced color stability, and excellent photocatalytic activity. SiO2 effectively protected the carbon black particles from ablation during the calcination process. Paints composed of ethanol, ethyl cellulose (EC), and pigments could be spray-coated on any substrate to prepare a structurally colored coating without limitation. The coatings show good mechanical stability and photothermal stability. The color of the structurally colored pigments can be easily changed by adjusting the sizes of the CB@SiO2@TiO2 nanospheres. The photocatalytic activity of the pigments on formaldehyde (HCHO) and methylene blue (MB) solution and reaction kinetics of their degradation were studied by experiment. The results showed that the photocatalytic activity of the pigments increased with the increase of the TiO2 loading, and the degradation rate of HCHO reached 96.7% for 3 h and that of MB reached 97.9% for 60 min when the TiO2 shell thickness was 40 nm. The structurally colored pigments based on CB@SiO2@TiO2 nanospheres effectively solve the environmental problems caused by the application of pigments and have a promising future in the fields of color decoration, display, and painting.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Xing-Yao Zhao,Xiao-Song Zhang,Xin Liu,Xiao-Kai Gong,Xiu-Rong Yuan,Bao-zeng Zhou,Jian-Ping Xu,Li-Na Kong,Lan Li
Lead-based perovskite quantum dots (QDs) have promising applications in optoelectronic devices , but commercial applications are limited by the potential toxicity and poor stability of lead. Meanwhile, there are lattice, polarity, and thermal expansion coefficient mismatches in integrating semiconductor materials onto the surface of photoelectronic circuit devices, resulting in high-density defects limiting the reliability of photoelectronic devices. Therefore, there is a need to investigate perovskite alternatives that are non-toxic, stable, and can be effectively coupled to silicon photonic circuits. In this paper, lead-free perovskite Cs 3 Bi 2 Br 9 /SiO 2 QDs were synthesized. The emission wavelength falls within the 400–560 nm range, exhibiting vibrant blue photoluminescence and demonstrating exceptional air stability for a duration exceeding 60 days. Optical tests and density-functional theory (DFT) calculations show that the silica shell layer effectively binds the electron and hole wave functions, prevents photon-generated carriers from escaping, reduces surface defects , and improves the carrier recombination probability. Meanwhile, using Cs 3 Bi 2 Br 9 /SiO 2 QDs as a luminescent down-shifting (LDS) layer in combination with a conventional silicon solar cell , the photovoltaic conversion power was increased by 1.82%. Hence, the core-shell structure is designed by the green environmental protection method to control the improvement of the PL characteristics of QDs , which opens a window for the synthesis of new barrier materials in ethanol and water systems, making the Cs 3 Bi 2 Br 9 /SiO 2 QDs have great potential for the application of novel optoelectronic devices in the future.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Chenxiao Zhang,Lihong Nie,Jiafan Wang,Beifu Wang
In this work, a new type of composite nanoparticles, ‘pearl chain’, was developed by linking titanium dioxide and silicon dioxide by polyacrylic acid polymer chains, and the prepared TiO2-PAA-SiO2 composite nanoparticles were analysed by SEM, Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy and thermogravimetric analysis, zeta potential, x-ray diffraction, etc. The success of this work was verified by the successful linking of TiO2-PAA-SiO2 composite nanoparticles.TiO2-PAA-SiO2 composite nanoparticles were analysed to verify the successful attachment of pearl chains. The obtained TiO2-PAA-SiO2 were subsequently blended in different ratios to prepare polyvinylidene fluoride (PVDF) ultrafiltration membranes. The membrane performance was tested by porosity and water contact angle measurements, scanning electron microscopy, as well as experiments using bovine serum proteins and MTBE interception. The results showed that when a certain amount of TiO2-PAA-SiO2 was added, the surface wettability, porosity and permeability of the prepared modified composite membranes were significantly improved, and the BSA adsorption rate was increased from 71.59% to 80.86%, and the retention rate of MTBE was increased by 77%, in addition to showing a better anti-pollution effect (FRR: 91.07%). It was finally concluded that the prepared membranes embedded with 1.0 wt.% TiO2-PAA-SiO2 nanofillers showed good overall filtration performance, better contamination resistance and remarkable durability. The present work successfully demonstrated the feasibility of using polyacrylic acid chemical chains to connect nanoparticles with different functions to prevent particle loss and substantially enhance membrane performance, which is valuable for bridging connection of composite nanoparticles and exploring the development of high-performance ultrafiltration membranes.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）