PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2015
·Vol. 32
·期 10
·922-927
·
IF 3.081
Wei Chen,Kai Wang,Junjie Hao,Dan Wu,Shang Wang,Jing Qin,Chen Li,Wanqiang Cao
Graphical A high luminous efficiency of quantum dots (QDs) can be attained when incorporating them into mesoporous silica particles by a non-chemical method. The obtained luminescent microbeads can be dispersed into a polymer by physical blending. Composite films demonstrate a high light-conversion efficiency, as well as an excellent stability under high-temperature and high-humidity conditions.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 130
·107670-107679
·
IF 3.84
Shoulian Wei,Jianwen Li,Yong Liu
Magnetic mesoporous nanoparticles of Fe3O4@mSiO2 were prepared through co-precipitation and tetraethoxysilane hydrolysis at 60 °C and pH 10 with hexadecyl trimethyl ammonium bromide as the template. Hydroxypropyl β-cyclodextrin was modified onto Fe3O4@mSiO2 under sodium citrate and N2 protection via an ultrasound process to increase the catalytic efficiency. The prepared nanoparticles were characterized by Fourier transform infrared spectrometry, X-ray diffraction, scanning electron microscopy and a peroxidase-like activity assay. The results showed that the prepared nanoparticles have magnetic properties, peroxidase-like activity and a loose spherical cluster structure. Compared with Fe3O4@mSiO2 nanoparticles, Fe3O4@mSiO2@HP-β-CD nanoparticles exhibit higher catalytic ability toward both H2O2 and 3,3′,5,5′-tetramethylbenzidine. Fe3O4@mSiO2@HP-β-CD nanoparticles can catalyse β-estradiol (β-E2) oxidation in the presence of H2O2 and be used as a colourimetric sensor for indirect detection of β-E2. A good linear relationship was obtained from 0.8 μM to 16 μM. The limit of detection of the proposed method was 0.2 μM. The visual method was successfully used in the analysis of β-E2 in commercial tablets and animal feeds, with recovery ranging from 92.6% to 110%.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 5
·057513
·
IF 3.1
Rui Cao,Guoshun Chen,Chuanyi Feng,Yu Qi,Kun Xiang,Peipei Li,Jun Wang,Xucheng Fu,Cheng Yang,Ju Wu
Cadmium (Cd(II)) is highly toxic to environmental, and while many approaches have been developed to measure cumulative Cd(II) concentration over time, online monitoring of spatiotemporal changes remains challenging. To address this, an electrochemical sensor for determination of ultra-trace Cd(II) was developed, based on gold/graphene oxide/copper oxide (Au/GO/CuO) nanomaterials modifying glassy carbon electrode. CuO nanoparticles were prepared by a green synthesis method using plant extract, and the Au nanoparticles were deposited on the GO/CuO nanosubstrates by an in situ electrochemical method. The prepared nanocomposites were characterized by field-emission scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The CuO nanoparticles are layered flower-like with an average particle size of 200–500 nm. Au/GO/CuO nanocomposites with high specific surface area and excellent electronic transmission capability enhanced the electrochemical signal of the sensor. Owing to the synergistic effect of Au/GO/CuO, the sensor exhibited good performance to Cd(II) in the ultra-wide range of 5 × 10−11–5 × 10−7 M with a detection limit of 2 × 10−11 M. The sensor was successfully quantified for determining Cd(II) with desirable recovery, displaying outstanding long-term stability, high sensitivity, and reproducibility. After validating its accuracy, this sensor was successfully used for detection of Cd(II) in water and cosmetic samples.
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Water
·
2024
·Vol. 16
·期 14
·2026
·
IF 3
Yang Gu,Chengjun Qiu,Wei Qu,Wei Tao,Zizi Zhao,Huili Hao
Cadmium (Cd) and zinc (Zn) in seawater enter the human body through the food chain. Combined toxicity tests indicated that high concentrations of Cd(II) and low concentrations of Zn(II) had a synergistic effect on humans. Thus, there is an urgent need to prepare a sensor for rapid and simultaneous detection of Cd(II) and Zn(II) in seawater. Herein, a reduced graphene oxide/carboxylated multi-walled carbon nanotube (rGO/MWCNT-COOH)-modified glassy carbon electrode was prepared in the experiments using the dropping method. The synthesis of various materials achieved the purpose of expanding the surface area, and scanning electron microscopy was used to observe the structure of the composite membrane. Moreover, the large number of functional groups on the surface of the composite membrane can also increase the adsorption of ions. For the determination of trace cadmium (II) and zinc (II) in seawater, the method used was differential pulse voltammetry (DPV). The results show that the peak current, which was obtained in the range of 5–400 μg/L for Cd(II) and Zn(II), has a linear relationship with concentration, corresponding to the detection limits of 0.8 μg/L for Cd(II) and 0.98 μg/L for Zn(II). The modified electrode was used to determine the Cd(II) and Zn(II) content in the coastal seawater of the Maowei Sea, and the recovery rate was between 95.8 and 98.2% for Cd(II) and 96.7~99.4% for Zn(II), which provided a novel approach of detection to define trace Cd(II) and Zn(II) in seawater.
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ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Huanhuan Xing,Sipeng Tian,Zihan Zhou,Zihang Zhang,Chunmei Zhang,Shan Zhang,Jian Lin,Chunxian Guo,Erkang Wang,Jing Li
The design and synthesis of high-efficiency electrochemiluminescence (ECL) emitters hold great promise for a wide range of analytical applications. In this study, we developed a rapid and straightforward strategy to fabricate a self-luminous Cd-based metal–organic framework (Cd-MOF) using individual aggregation-induced emission ligands, specifically 1,1,2,2-tetrakis(4-(pyridin-4-yl)phenyl)ethane (TPPE), within a few seconds. The rigid and directionally enriched metal node of Cd, along with the organic ligands, is formed within the Cd-MOF via coordination, effectively constraining the intramolecular free motions of TPPE and suppressing nonradiative relaxation. Additionally, the unique porous structure combined with the catalytic activity resulting from the incorporation of Cd2+, endow the Cd-MOF with 90-fold ECL enhancement compared to individual TPPE as more chromophores are electro-excited and more coreactants are catalyzed to produce luminescence. The as-made Cd-MOF amplifies the ECL performance by integrating ECL emitters and coreactant accelerators into a single entity, simplifying the sensing process. Leveraging the excellent ECL performance, we constructed a sensitive ECL sensor for hydroquinone based on competitive reactions, with a wide linear range from 200 nM to 1 mM and a satisfying detection limit as low as 80 nM.
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LANGMUIR
·
2025
·
IF 3.9
Shiqin Long,Qingze Chen,Hongyan Wei,Jing Liu,Shoushu Wei,Yixuan Yang,Hongbo Li,Runliang Zhu,Hongping He
Soil minerals are important natural adsorbents that regulate heavy metal fate; yet, the influence of natural drying on their adsorption behavior remains poorly understood. This study compared how drying affects Cd(II) and Zn(II) retention and selectivity on two widespread soil minerals, ferrihydrite (Fhy) and kaolinite (Kln), using single/binary adsorption experiments. Results indicated that drying significantly enhanced Cd(II) and Zn(II) retention on Fhy by promoting inner-sphere complexation and enhancing the stability of metal-mineral bonds, as evidenced by extended X-ray absorption fine structure (EXAFS) spectroscopy analyses. In contrast, the effect on Kln was less pronounced, with Cd(II) and Zn(II) predominantly adsorbed via electrostatic interactions and drying having a minimal impact. Crucially, drying induced contrasting selectivity changes: it enhanced the selective adsorption of Zn(II) on Kln while favoring Cd(II) selectivity on Fhy. Density functional theory (DFT) computations corroborated this finding, showing lower adsorption energies for Cd(II) than for Zn(II) on Fhy, with the reverse trend observed on Kln. This preferential adsorption of Cd(II) on Fhy and Zn(II) on Kln after drying was attributed to the drying process facilitating the formation of more stable bonds between metal ions and mineral surfaces. These findings establish a theoretical framework for predicting the fate of metals in dehydration-affected soils and contribute to a systematic understanding of the environmental functionality of soil minerals.
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CHEMICAL PAPERS
·
2025
·
IF 2.5
Chen Yufeng,Li Yutong
A novel surface-enhanced Raman scattering (SERS) substrate was developed to determination of the pesticide carbendazim (CBZ) through the green synthesis of silver nanoparticles (SA-AgNPs-CD) using sodium alginate as a reducing agent and α-cyclodextrin as a molecular recognition stabilizer. The composite material was systematically characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and UV–vis spectroscopy. The analysis revealed spherical nanoparticles with an average diameter of approximately 59 nm and localized surface plasmon resonance at 412 nm. 4-aminothiophenol (PATP) was used as a SERS probe to discuss the SERS activity of the substrate and multivariate optimization of detection parameters (substrate–analyte ratio 3:1, pH 6.8, 15 min adsorption, and sequential reagent addition) via orthogonal experimental design. The linear response which extends from 5.0 × 10 −5 to 1.0 × 10 −7 mol/L for CBZ combined with principal component analysis (PCA) revealed an ideal linear relationship between CBZ concentration and principal component F 1 , achieving a limit of detection (LOD) of 1.95 × 10 −9 mol/L. It is expected that this SERS strategy will provide great value for rapid detecting pesticide residues in fruits and food products.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yinghong Wang,Ping Xiong,Wei Yang,Zhitong Zhang,Xiaoling Xu,Liming Yang,Huiji Xiao,Kai Zhang,Zhenzhou Wang,Wei Zhang,Xubiao Luo
Highly selective Mg 2+ /Li + separation membranes hold significant application prospects in extraction of lithium. However, the high Mg 2+ /Li + concentration ratio commonly found in brines and the very close hydrated ionic radii of the two ions limit the separation efficiency of conventional membranes. This study proposes a dual-phase supramolecular synergistic sieving nanofiltration membrane design strategy. Leveraging the unique molecular recognition unit and hydrophilic external interface characteristics of γ -cyclodextrin ( γ -CD), combined with the multifunctional positively charged groups of histidine, the strategy achieves the directional construction of highly efficient Mg 2+ /Li + sieving channels within the membrane. The strategy is accomplished through the synergistic action of γ -CD’s selective capture of high-valent Mg 2 + and histidine’s electrostatic repulsion effect. During the Mg 2 + /Li + separation process, the fabricated γ -CD-histidine composite membrane (HCF membrane) demonstrates outstanding comprehensive performance. It achieves a remarkably high Li + /Mg 2+ separation factor of 28.98 and maintains excellent separation performance across a wide Mg 2+ /Li + ratio range (1:1–100:1). The enhanced hydrophilicity of the HCF membrane significantly boosts permeate flux, while also exhibiting long-term operational stability and biofouling resistance during continuous operation under high Mg 2+ /Li + ratios. This research enables the high-selectivity separation of Mg 2+ and Li + with concurrent Li + enrichment, demonstrating significant potential for lithium extraction from salt-lake.
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Biomolecules
·
2025
·Vol. 15
·期 7
·1052
·
IF 4.8
Guo Wei,Chuanliang Wang,Rui Wang,Peng Zhang,Xuhui Geng,Jinhua Li,Abbas Ostovan,Lingxin Chen,Zhihua Song
Aloin, a kind of active phenolic component, is sourced fromAloe vera. Recently, the determination of aloin has received enormous attention, owing to its positive performance (including anti-tumor, antibacterial, detoxification, liver protection, anti-stomach damage, and skin protection activities) and painful side effects (increased carcinogenicity caused by excessive use of aloin) impacting human health. This investigation was inspired by the good fluorescence properties of carbon dots (CDs); CD-based sensors have aroused a great deal of interest due to their excellent sensitivity and selectivity. Thus, it is of great significance to develop novel CD-based sensors for aloin determination. Herein, N,F-CDs were designed and synthesized through a convenient hydrothermal strategy; the synthesized N,F-CDs possessed good fluorescence performance and a small particle size (near 4.3 nm), which demonstrated the successful preparation of N,F-CDs. The resulting N,F-CDs possessed a large Stokes shift and could emit a highly stable green fluorescence. The fluorescence of the N,F-CDs could be effectively quenched by aloin through the inner filter effect. Furthermore, the synthesis procedure was easy to operate. Finally, the N,F-CD-coated test strips were fabricated and combined with a miniaturized fluorimeter for the fluorescence detection of aloin via the inner filter effect for the first time. The N,F-CD-coated test strips were fabricated and used for the fluorescence sensing of aloin, and the results were compared with a typical ultraviolet (UV) method. The N,F-CD-coated test strips exhibited high recovery (96.9~106.1%) and sensitivity (31.8 nM, n = 3), good selectivity, low sample consumption (1 μL), high speed (5 min), good stability, and anti-interference properties. The results indicate that N,F-CD-coated test strips are applicable for the quantitative determination of aloin in bovine serum, orange juice, and urine samples.
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APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Xuanru Li,Liuwei Wang,Bei Chen,Yuanyuan Xu,Huixia Wang,Fei Jin,Zhengtao Shen,Deyi Hou
Layered double hydroxides (LDH) show great promise for the remediation of heavy metals and metalloids in aqueous media and soils. In this study, we propose a green synthesis approach for LDH utilizing industrial waste granulated ground blast furnace slag (GGBS) and readily available magnesium oxide (MgO), and applied these green synthesized LDH for As and Cd remediation in both water and soil. The synthesized LDH were characterized via multiple approaches including SEM , HRTEM-EDS, TGA , XRD, and FTIR, demonstrating that the addition of 20% MgO in the raw materials (LDH b ) substantially improved the stability of LDH compared to LDH synthesized solely from pure GGBS (LDH a ). Batch adsorption experiments were conducted to evaluate the adsorption efficiency of LDH a and LDH b for Cd(II) and As( V ) under varying initial solution pH conditions . Results showed that as the pH increased, calcium leaching remained high while aluminum leaching gradually increased. The adsorption isotherms and kinetic studies further revealed that LDH b displayed better adsorption performance for As( V ) across different pH conditions, while both LDH showed a 100% removal rate of Cd(II) at pH ranging from 6 to 9. Both LDH a and LDH b exhibited promising immobilization effects on As and Cd in contaminated soils, with LDH a showing superior stabilization performance toward As, immobilizing 83.8% of bioavailable As in the farmland soil and 78.7% in the industrial site soil, compared to LDH b 's 54.8% and 50.6%, respectively. The findings of this study hold promise for the practical application of LDH as an efficient and environmentally friendly remediation material for contaminated water and soils containing toxic metal(loid)s.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Yuankun Liu,Qi Tao,Xinyu Guo,Jipeng Luo,Jinxing Li,Yongchao Liang,Tingqiang Li
Mineral nutrients play an important role in heavy metal uptake and accumulation in plant. However, the effects of calcium (Ca) supply level on apoplastic transport in roots and consequences for uptake of cadmium (Cd) in hyperaccumulators are poorly understood. Here, we investigated how Ca regulated the development of apoplastic barriers in the roots of two ecotypes of Sedum alfredii and assessed its effects on Cd uptake. Results of correlation analysis indicated that Ca content was positively correlated with the development of Casparian strips (CSs) and suberin lamellae (SL) in the absence or presence of Cd. Simultaneously, low Ca supply was proven to delay the formation of endodermis CSs and suberin accumulation by decreasing the relative expressions of genes associated with CSs localization and lignin/suberin synthesis. Moreover, Cd in apoplastic fluid and cell walls (regarding the apoplastic transport) and symplastic fractions were elevated by low Ca supply. Contrary to high Ca supply, the expression levels of genes related to Cd influx and xylem loading were increased upon low Ca addition in roots of both ecotypes. All the results above suggested that low Ca supply promotes root Cd uptake via apoplastic pathway by delaying apoplastic barriers development and also regulating Cd transport to the xylem in S. alfredii .
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2025
·
IF 6.2
Mingtao Tan,Rui Qi,Linyi Meng,Shijie Du,Shanchun Yan,Dun Jiang
Heavy metals are significant environmental pollutants that contribute to widespread contamination. This study demonstrated that Cd transfer through the food chain imparts cross-tolerance to λ-cyhalothrin in Hyphantria cunea larvae. Cd-induced activation of the P450 detoxification system, particularly HcCYP6AE179 and HcCYP9A286, was identified as a critical mechanism for the development of pesticide cross-tolerance in Cd-exposed H. cunea larvae. The dual-luciferase reporter assays, RNAi, and agonist treatment experiment confirmed that HcAhr (Aryl hydrocarbon receptor) upregulated the expression of HcCYP6AE179 and HcCYP9A286. Additionally, H2O2 generation under Cd stress served as a key upstream signal for activating the HcAhr-HcCYP6AE179/HcCYP9A286 detoxification pathway. The nucleic-acid-based pesticides targeting HcAhr, HcCYP6AE179, and HcCYP9A286 exhibited superior stability, biosafety, and gene silencing efficacy. Treatment with these nucleic acid pesticides significantly reduced the tolerance of H. cunea larvae to λ-cyhalothrin in the CK and Cd groups. This work introduces novel approaches for mitigating pesticide cross-tolerance induced by heavy metals.
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