TALANTA
·
2024
·
IF 5.6
Yueshou Zhang,Lichun Yang,Yulin Xu,Haiting Ren,Shi Yin,Yan Sun,Yongjun Hu
Rapid and sensitive detection of phosphate is of great significance for ensuring water safety and preventing eutrophication. In this study, we prepared Au@PATP@Ag NRs core-shell structures using 4-aminothiophenol (PATP) as an internal standard signal molecule to enhance the stability of the SERS signal. Based on the phosphate-induced decomposition of ZIF-8 and the protective effect of ZIF-8 on the internal Au@PATP@Ag NRs, a phosphate SERS sensor (Au@PATP@Ag@ZIF-8) with high sensitivity, selectivity and stability was designed. This method exhibited a good linear range of 0.1–125 μM and a detection limit of 30 nM. Furthermore, the developed sensor (Au@PATP@Ag@ZIF-8) was effectively applied to assess PO 4 3− in tap water samples, achieving recoveries between 97.44% and 104.54%. With its simple, fast and sensitive features, this method of phosphate detection in water provides a direction for the research and practical application of phosphate detection.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Yangmei Qin,Shizhao Jian,Ke Bai,Yuyang Wang,Zenghui Mai,Senqing Fan,Boya Qiu,Yu Chen,Yinan Wang,Zeyi Xiao
With the PTFE membrane as the substrate, a novel Ag-based catalytic membrane reactor (CMR) was fabricated by deep-permeation synthesis fabrication (DPSF). In DPSF, ZIF-8 was first assembled inside the membrane pores by permeation flow and the depositing reaction of Zn2+, and 2-methylimidazole solutions flow through the membrane synergistically. Then, Ag was reduced inside the pores impregnating ZIF-8 nanoclusters by Ag+ and reductant solutions flowing through the membrane similarly. The TEM images of the cross-sectional membrane exhibited the composite nanoparticles of Ag+ZIF-8 with good dispersion and size distribution (10–50 nm). The as-synthesized (Ag+ZIF-8)@PTFE was applied to the catalytic reduction of p-nitroaniline to p-phenylenediamine in a continuous flow-through reactor and presented remarkable catalyzing performance. The maximal apparent reaction rate constant is 3–4 orders of magnitude higher than that reported with good stability.
研究领域:
材料科学
·
催化化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Lan Zhang,Tingting Zhang,Shiying Wu,Lujie Li,Wei Li,Lingling Wang,Weihua Li,Xianhuai Huang,Jiansheng Li,Rui Lu
Although surface-enhanced Raman scattering (SERS) is a powerful spectral analysis technique, its practical application is restricted due to the poor chemical stability of some noble metal nanoparticles. In this work, Ag@ZIF-8 nanocomposites with different ZIF-8 core-shell thicknesses were prepared by coating AgNP surfaces with polyvinylpyrrolidone and adjusting the dosage of zinc nitrate and 2-methylimidazole. Several characterizations have confirmed that the Ag@ZIF-8 nanocomposites was successfully prepared. Based on transmission electron microscopy images and SERS spectral intensity, it was determined that Ag@ZIF-8 nanocomposites with a ZIF-8 shell thickness of 30 nm exhibited optimal SERS performance. As a result of evaluating the uniformity and stability of the composite with 4-ATP as the probe molecule, it showed a relative standard deviation of 6.91 % and a decrease in SERS intensity of 4.5 % after 28 days. Based on the results obtained with Ag@ZIF-8 nanocomposites as the SERS substrate, the detection limits of 4-mercaptopyridine and thiram were as low as 5.87×10 −9 M and 6.61×10 −8 M, respectively. Furthermore, the finite-difference time-domain simulation reveals an enhancement factor of 2.6×10 6 , which is in good agreement with the experimental value of 1.8×10 6 , confirming its effectiveness as a SERS substrate.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 39
·27203-27211
·
IF 3.9
Jiaxin Xiao,Shumin Zhu,Lingjun Bu,Yuan Chen,Ruoxi Wu,Shiqing Zhou
Halonitrophenols (HNPs) are an emerging type of aromatic disinfection byproduct, with detected concentrations of ∼nmol L−1 in source water and drinking water. Currently, there are no standard methods for identifying HNPs, and most of the reported methods are time-consuming and equipment-dependent. A core–shell metal–organic framework (MOF) based electrochemical sensor (Ag/ZIF-8@ZIF-67) capable of detecting 2,6-dichloro-4-nitrophenol (2,6-DCNP) is reported in this study. The electrochemical sensor obtains the concentration of 2,6-DCNP by detecting the peak current passing through the sensor. In this sensor, Ag nanoparticles (AgNPs) play a key role in electrochemical sensing by reducing nitro groups via electron transfer, and porous structure with a large surface area is offered by ZIF-8@ZIF-67. The cyclic voltammetry (CV) response of Ag/ZIF-8@ZIF-67 was found to be approximately 1.75 times and 2.23 times greater than that of Ag/ZIF-8 and Ag/ZIF-67, respectively, suggesting an ideal synergistic effect of the core–shell structures. The Ag/ZIF-8@ZIF-67 sensor exhibited exceptional sensitivity to 2,6-DCNP, exhibiting a broad linear response range (R2 = 0.992) from 240 nmol L−1 to 288 μmol L−1 and a low detection limit of 20 nmol L−1. Furthermore, the sensor exhibited good anti-interference for isomers and common distractors in water, excellent stability and reproducibility, and high recovery in actual water samples. Our reported sensor gives a novel strategy for sensitive, selective, and in situ detection of 2,6-DCNP in practical analysis.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
De Zhang,Mingxin He,Chongyang Qin,Zhuoqun Wu,Minhui Cao,Dejiang Ni,Zhi Yu,Pei Liang
The unreasonable spraying and random migration of acetamiprid may cause pollution of crops, soil and water resources in the environment, resulting in threatening ecosystem and human health. However, the monitoring of acetamiprid using mass spectrum in the environment encounters challenges due to high-cost instruments and complex processing time. Herein, we fabricated a rapid and reliable SERS method based on Ag@ZIF-8@Au platforms for tracing acetamiprid residues in the environment. In this method, a MOF material named ZIF-8 is coated with silver nanoparticles and distributed internally between AgNPs and AuNPs to enhance Raman signal, which can enrich pesticide molecules into the hotspots area provided by noble material and helps avoid the oxidation of silver nanoparticles. High sensitivity (LOD of 9.027 × 10 -10 M for acetamiprid, and SERS enhancement factor of 4.3 × 10 7 ), excellent reproducibility (6.496% or 7.198% RSD for 30 random points) and superior stability (3.127% RSD for 6 weeks) were achieved using the proposed method. Acetamiprid with concentrations from 10 -4 to 10 -9 M were successfully detected by SERS method. Furthermore, the linear detection models of acetamiprid in different environment matrices (lake water, tea leaves, tea garden soil, oranges and oranges orchard soil) were established and all the correlation coefficient (R 2 ) were higher than or equal to 95%, indicating the excellent adaptability of Ag@ZIF-8@Au platform in environment. The randomly spiked concentrations of acetamiprid were also tested with good recovery values and low relative error values, further confirming the reliability of the detection method.
研究领域:
分析化学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Yuxin Song,Huan Xing,Liang Ma,Fengxia Wang,Mingfang Zhang,Zherui Wan,Xuewen Li,Yan Tang,Guang Yang
Heavy metal ions (HMIs) pose a great threat to human health because of their irreversible detrimental effects, thus the fabrication of a convenient sensing platform that is capable of tracing HMIs with high accuracy remains a major challenge. Herein, a portable strategy for the fabrication of electrochemical sensor was described in which Ag-ZIF-8 and polyaniline (PANI) were combined and dropwise to glassy carbon electrode (GCE) for the recognition of Pb 2+ and Cu 2+ by DPSV. The structures and properties of the proposed working electrode (PANI/Ag-ZIF-8/GCE) were studied by TEM, SEM, FT-IR, XRD, CV and DPSV. Additionally, the results revealed that the designed sensing platform of the PANI/Ag-ZIF-8/GCE displayed excellent electrochemical performance for the simultaneous and individual tracing of HMIs including (Pb 2+ and Cu 2+ ) with satisfactory sensitivity and selectivity due to the excellent conductivity of PANI and large surface areas with abundant active sites on Ag-ZIF-8. The LODs for individual recognition of Pb 2+ and Cu 2+ were 0.003 μM and 0.006 μM, respectively. The LODs of simultaneous tracing of Pb 2+ and Cu 2+ were 0.004 μM and 0.008 μM, respectively. Moreover, real sample analysis of tap water and the Songhua River indicated good results with higher reliability for the detection of target HMIs, which may be beneficial for the fabrication of MOF-based probes by a simple strategy for the detection of HMIs to safeguard people’s lives and health.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Xiu-yan Zhang,Ting Wang,Li-guang Wu,Hai-Chang Guo
In order to improve the separation performance and anti-fouling property of polyvinylidene fluoride (PVDF) ultrafiltration membranes, PVDF mixed matrix membranes (MMMs) were obtained by mixing PVDF with Ag@ZIF-8 using a simple one-pot microemulsion strategy. First, both Ag and ZIF-8 were generated in one micelle of the microemulsion during the formation of composites. After in-situ polymerization of microemulsion， the latex containing Ag@ZIF-8 was blended with PVDF by phase-inversion method to construct the MMMs. The small-sized Ag particles were closely distributed on the surface of ZIF-8 after the formation of ZIF-8 in micelles. The subtle interaction forces between the two facilitated the distribution of the composite in the PVDF matrix. In addition, the hydrophilic component in the latex improves the pore structure , the permeation and anti-fouling performance of the PVDF matrix compared to neat PVDF and the MMM with ZIF-8 added. Mixed-matrix ultrafiltration membranes with 0.3 wt% of microemulsion containing Ag@ZIF-8 exhibited good permeation ( J w = 222 L m −2 h −1 ) and flux recovery rate ( FRR = 82%). The well-distributed Ag@ZIF-8 in PVDF polymeric matrix strengthened the dye retention of MMMs from high-salinity wastewater, due to the interaction between Ag@ZIF-8 and dye molecules. This mixed-matrix ultrafiltration membrane also showed optimum dye rejection (97.3%) and low salt rejection (0.2%). The MMMs combined with Ag@ZIF-8 in this work are promising for the removal of dye contaminants for high-salinity wastewater, so as to achieve the goal of advanced treatment for high-salinity wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Jialin Shi,Lina Zhang,Nannan Sun,Deng Hu,Qun Shen,Fang Mao,Qiang Gao,Wei Wei
Metal–organic frameworks (MOFs) are promising hosts for catalytic active sites due to their adjustable porosity and framework chemistry. Strategies to improve synergistic effects between the installed sites and the parent MOF are highly desired. Herein, a facile and rapid method for the preparation of xAg@ZIF-8 materials was reported. The materials were systematically characterized and used as catalysts for carboxylation of terminal alkynes via direct insertion of CO2 to the C(sp)–H bond (CTACO2). It was found that the integrity of the ZIF-8 structure could be retained upon Ag loading, but short-range crystalline ordering was modified. Two types Ag species could be installed, namely, highly dispersed Ag(I) in the backbone (AgHD) and aggregated Ag(0) nanoparticles on the outer surface (AgNP). The AgNP sites are highly effective for the activation of terminal alkynes due to its high accessibility, while the AgHD-modified ZIF-8 framework worked as a CO2 reservoir with enhanced affinity. Combination of these factors translated to high activity in the CTACO2 process, the measured turnover frequency and time yield are among the highest among most heterogeneous catalysts.
研究领域:
催化
·
材料科学
·
化学工程
·
无机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Aotian Gu,Jiuyu Chen,Qianhong Gao,Muhammad Musaa Khan,Peng Wang,Yan Jiao,Zongxiang Zhang,Ying Liu,Yi Yang
The high effective Ag/ZIF-8@ZIF-67 core-shell composite was fabricated by a convenient strategy and applied in the reduction of 4-nitrophenol. The obtained samples were fully characterized by transmission electron microcopy (TEM), element mapping, X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and the like. Catalytic experiments showed that the Ag/ZIF-8@ZIF-67 exhibit superior catalytic activity in the reduction of 4-nitrophenol and another two nitroaromatic compounds. The apparent rate constant (K app ) and the conversion frequency (TOF) of Ag/ZIF-8@ZIF-67 0.4 for 4-nitrophenol were 12.22 × 10 −3 s −1 and 5.611 min −1 , respectively, and preserved high catalytic performance after four cycles. The catalytic activity of Ag/ZIF-8@ZIF-67 was significantly increased compared to Ag/ZIF-8, which was mainly attributed to the high specific surface area of ZIF-8@ZIF-67, the synergy of ZIF-8 core and ZIF-67 shell and the restriction of pores to Ag NPs.
研究领域:
材料科学
·
环境化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Food Bioscience
·
2025
·
IF 5.9
Tao Lu,Zhiguang Suo,Min Wei,Huali Jin,Yong Liu,Baoshan He,Renyong Zhao
β-lactoglobulin (β-LG) is a major allergen in milk what can provoke intense allergic reactions. Therefore, an accurate and efficient method is required for sensitive detection of β-LG. A label-free electrochemical aptasensor utilizing Au/Ag@ZIF-8 and dual amplification strategy has been designed for the detection of β-LG. Au/Ag@ZIF-8 nanocomposite is used as the electrode modification material, which has abundant relative surface area and exceptional conductivity behavior, and it can also serve to immobilize DNA strands. By combining RecJf exonuclease and hybridization chain reaction (HCR) dual amplification strategy, an apparent enhancement of electrochemical signal is obtained. β-LG undergoes target cycling in the effect of RecJf exonuclease, which dislodges complementary strand cDNA and further triggers HCR to provide a large number of sites for methylene blue embedding. The detection range of this aptasensor is 0.01–1000 ng/mL in the optimal detection conditions, with a limit of detection (LOD) of 5.37 pg/mL. The constructed electrochemical aptasensor possesses the superiorities of good specificity, preeminent accuracy and satisfied stability in the detection of β-LG. Moreover, it also demonstrates satisfactory detection performance in the detection of real samples, which indicates that the electrochemical aptasensor has a broad application prospect in protecting food safety and health.
研究领域:
食品安全检测
·
生物传感技术
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Xia Zhou,Xiaoling Lin,Haiqiu Huang,Ping Li,Jiamin Wu,Xueqin Huang,Huaihong Cai,Hai Han,Junxia Zheng,Haibo Zhou
Visual, highly selective, and sensitive detection of sulfur dioxide (SO 2 ) and its derivatives (SO 3 2- ) in vitro/in vivo is of great significance in maintaining cell homeostasis. A new Au@Ag@ZIF-8 optical sensor with o-phenylenediamine (OPD) internal coding surface-enhanced Raman scattering (SERS) tags based on the free radical reaction was synthesized for multi-mode detection of sulfite . First, Co 2+ is oxidized to Co 3+ . Second, the oxidoreduction between SO 3 2- and Co 3+ produces SO 4 -• and Co 2+ to complete the cycle. The resulting SO 4 -• is further reacted with the chromogenic substrate OPD to form the polymer. Due to the UV–vis absorbance of OPD polymer being stronger than that of OPD, but the fluorescence intensity is lower, and their Raman peaks are obviously different, this sensor can be used for the detection of SO 3 2- through colorimetric, fluorescence, and Raman multi-mode. The main advantages are as follows: (1) high selectivity; (2) achieve fast, visual, and highly sensitive detection of SO 3 2- , and the low limit of detection (LOD) is 1 nM; (3) improve the reliability of detection and expands the detection range (1 nM-800 μM); (4) demonstrate the applicability in recognizing SO 3 2- in HeLa cells to provide accurate information on the dynamic distribution of sulfur in cells.
研究领域:
分析化学
·
生物医学工程
·
细胞生物学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Yaqin Zhan,Jinru Cao,Ying Wang,Xuesong Li,Yixing Li,Huihui Zeng,Wenyi Huang,Hao Cheng,Si Gao,Lijun Li,Jun Feng
Surface Enhanced Raman Scattering (SERS) has been extensively utilized in therapeutic drug monitoring (TDM) due to its rapid detection speed, high sensitivity and straightforward sample pretreatment. In this study, Au/AgNPs were obtained through the reduction of AgNO 3 on the surface of AuNPs. Subsequently, Au/AgNPs were embedded into the tetrahedral lattice of ZIF-8 MOFs, resulting in the formation of Au/Ag@ZIF-8 nanocomposites. The Au/Ag@ZIF-8 nanocomposites exhibit a robust electromagnetic enhancement of Au/Ag bimetallic nanoparticles and a considerable adsorption capacity of ZIF-8 MOFs. This enables the pre-enrichment of target molecules in the vicinity of the electromagnetic field of the Au/AgNPs, thereby enhancing the sensitivity of SERS detection. The SERS substrate also exhibits high stability and reproducibility, as well as molecular sieving effects, due to the fact that Au/AgNPs are embedded into the tetrahedral lattice of ZIF-8. A TDM method for tacrolimus (FK506) in human serum was developed by using Au/Ag@ZIF-8 nanocomposites as solid phase extraction (SPE) adsorbent and SERS substrates. The results showed that under the optimized conditions, tacrolimus exhibited satisfactory linearity within the concentration range of 10 −5 -10 −11 mol L −1 , with a correlation coefficient (R 2 ) of 0.9944, and the limit of detection (LOD) was as low as 6.4 pg mL −1 . The recoveries were observed to range between 92 % and 105 %, with an RSD of below 8 %. The method is highly sensitive, exhibiting a sensitivity that is 3-6 orders of magnitude higher than that of existing analytical techniques. It has the potential to be applied in a clinical setting to biological samples.
研究领域:
分析化学
·
医学检测
·
纳米材料科学
✓ 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）