Analytical Methods
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2024
·
IF 2.7
Changmao Yang,Yue Xiao,Yunjun Yan,Houjin Zhang
The development of straightforward and cost-efficient methods for bacterial identification is very important. In this study, we utilized xylenol orange, metal ions, and diverse bacterial carbon sources to construct a sensor array, achieving precise bacterial identification. Initially, we examined the absorbance variations of xylenol orange with five metal ions (Mn2+, Co2+, Ni2+, Cu2+, and Zn2+) at pH levels ranging from 4 to 7, observing significant changes at 570 nm or 580 nm. Given that bacteria can generate varying amounts of acid in different carbon sources, we employed a blend of xylenol orange and the five metal ions as pH-sensitive probes to characterize bacterial metabolism in three carbon sources, resulting in the development of a five-sensor array that effectively differentiated seven bacteria. Additionally, by utilizing xylenol orange with Co2+, we successfully identified six different bacterial mixtures and five types of probiotic drink products. These findings highlight the potential of our methods for broader practical application in bacterial identification in practical use.
研究领域:
微生物学
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生物传感技术
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PubMed
高影响因子
Catalysts
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2024
·Vol. 15
·期 1
·24
·
IF 3.8
Yaohui Xu,Yong Li,Zhao Ding,Yang Zheng
To further enhance the safety and energy efficiency of the Fe3O4preparation experiment, we proposed a strategy for synthesizing monodisperse Fe3O4microspheres through a one-step solvothermal process. In this environmentally friendly synthesis method, stable FeCl3∙6H2O was utilized as the sole raw material, while ethylene glycol, characterized by its high boiling point and favorable safety profile, served as the solvent. Additionally, inexpensive and readily available urea was selected to function either as a mineralizer or surfactant. Through this one-step solvothermal reaction, the target product of Fe3O4could be obtained without subsequent calcination under reducing or inert atmospheres, thereby enhancing experimental safety and promoting energy conservation. By controlling the amount of urea added, it became feasible to produce monodisperse magnetic Fe3O4microspheres characterized by complete crystallinity and high yield. Utilizing the as-synthesized Fe3O4as a catalyst, we investigated its photocatalytic activity against xylenol orange organic dyes along with its regeneration characteristics. When 40 mmol of urea was incorporated into the reaction mixture, the resulting Fe3O4sample exhibited optimal photocatalytic performance; a 20 mg/L xylenol orange solution became colorless and transparent after just 1.5 h of UV light irradiation. Furthermore, during five consecutive regeneration cycles, its catalytic activity could be restored to its initial level. Importantly, Fe3O4demonstrated excellent magnetic sensitivity properties that facilitated rapid targeted separation under an external magnetic field, providing convenience for recovery and collection purposes.
研究领域:
材料科学
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环境科学
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高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2017
·Vol. 96
·期 9
·2007-2013
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IF 1.356
Xueqing Yu,Yingjun Jing,Hui Gao
To enhance the adsorption performance, chitosan microspheres (CS–MSs) were grafted with polyethylenimine (PEI), a cationic compound with abundant amine groups. The resulting PEI-grafted CS–MSs (PEI–CS–MSs) were used for the adsorption of xylenol orange (XO), an anionic dye. The results show that PEI–CS–MSs were in regular spherical shape without porous structure. XO molecules were adsorbed onto the amine groups of PEI–CS–MSs through electrostatic interaction. The maximum adsorption capacity of XO onto PEI–CS–MSs was 816.33 mg/g at 303 K, being much higher than that onto CS–MSs. The adsorption process could be properly described by the pseudo-second-order kinetic and Langmuir models. The adsorption of XO was a spontaneous process with exothermic nature. In addition, the adsorption capacity only decreased by 0.52 % after seven cycles of adsorption-desorption, indicating the excellent reusability of PEI–CS–MSs.
研究领域:
材料科学
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环境科学
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2025
·
IF 2.8
Yanlin Jiang,Yang Gao,Hangqing Xue,Yeqiang Lu,Lixin Xue
Polyamide (PA) based thin-film nanocomposite (TFN) membranes containing zeolitic imidazolate framework (ZIF) particles, denoted as PA (ZIF)-TFN membranes, were fabricated via interfacial polymerization (IP) between m-phenylenediamine (MPD) and 1,3,5-benzenetricarbonyl chloride (TMC). ZIF-8 particles were incorporated by direct dispersion into the oil-phase solution. Subsequently, the membranes were etched with xylenol orange disodium salt (XO) under acidic conditions to produce reverse osmosis (RO) membranes with improved water flux and salt rejection. These improvements were attributed to additional water-permeation channels and the sealing of non-selective interface defects. Solution pH, etching duration, and XO concentration also play roles in the structure and performance of the optimized RO membranes. After 12 h of etching, superior TFN/XO (12) RO membranes were obtained with rejection rate increased from (99.0% ± 0.2%) to (99.7% ± 0.1%), and water flux increased from (42.3 ± 0.9 L·m −2 ·h −1 ) to (65.1 ± 0.9 L·m −2 ·h −1 ). In addition, the membranes exhibited excellent boron removal rate, operational stability, and anti-pollution performance under conditions of 32,000 ppm NaCl and 55 bar.
研究领域:
膜科学
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材料工程
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化学工程
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纳米技术
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水处理
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高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2025
·Vol. 48
·期 2
·63
·
IF 3.8
Li Yingying,Wang Wenxu,Bai Mengjie,Li Xia,Li Yongwei,Liu Haiying,Fang Zhihao,Sang Jing
Xylenol orange (XO) is a persistent anionic azo dye that resists conventional treatment. Cetyltrimethylammonium bromide (CTAB) and binding poly (vinylpyrrolidone) (PVP) were sequentially intercalated onto Na-montmorillonite (NaMt) to prepare a CTAB/PVP-modified Na-montmorillonite (CP-NaMt), and its adsorption toward XO was evaluated. The nanostructured adsorbent was characterized by chemical analysis, morphological, phase analysis, and point-of-zero-charge measurements. The characterization indicated successful organic intercalation accompanied by slight basal-spacing expansion, partial layer exfoliation and the development of a hierarchical micro-mesoporous structure. The Brunauer–Emmett–Teller specific surface area increased from 46.5 to 88.7 m 2 ·g −1 . Batch tests identified pH = 5 as optimal, consistent with XO speciation and the positively charged surface of CP-NaMt. The adsorption process reached equilibrium rapidly, with a maximum capacity of 93.85 mg·g −1 achieved within 40 min at 30 °C. Kinetics followed a pseudo-second-order model and intraparticle-diffusion analysis indicated multistage transport beginning with a film-diffusion regime. Equilibrium isotherms were better described by the Langmuir model. Thermodynamic analysis indicated a spontaneous, endothermic process with an entropy gain that facilitates desolvation and mass transport. Regeneration with ethanol maintained ≥ 87.4% removal over five cycles. Spectroscopic evidence and control experiments supported a mechanism dominated by electrostatic ion pairing at quaternary ammonium sites, further stabilized by hydrogen bonding and hydrophobic partitioning and π-π stacking within organic microdomains. This low-cost, regenerable clay platform shows potential for polishing dye-laden wastewater.
研究领域:
环境科学
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材料科学
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物理化学
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水污染控制
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吸附科学
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JOURNAL OF SOLID STATE CHEMISTRY
·
2026
·
IF 3.2
Yongwei Li,Shuting Fan,Zhihao Fang,Xiangru Zeng,Jinting Jiang,Fangfang Liu,Xuening Lun,Chengjie Li
A simple mineralizer regulation strategy is developed to tune the structure of hydrothermal MIL-100(Fe). • NaHCO 3 enhances the surface area of MIL-100 (Fe), affording superior XO adsorption performance. • Synergistic pore adsorption, hydrogen bonding, Fe 3+ coordination and π-π stacking enable efficient XO removal. Metal-organic frameworks (MOFs) are promising crystalline porous solids, whose functional properties are highly dependent on their crystallinity, defect states and pore characteristics. In this work, hydrothermal synthesis was employed to prepare MIL-100(Fe) materials modulated by three different mineralizers: sodium carbonate, acetic acid, and sodium bicarbonate; mineralizer-free pristine MIL-100(Fe) was used as the reference sample. The addition of mineralizers effectively modulates the crystal structure and porosity of MIL-100(Fe). All mineralizer-modified samples exhibit larger specific surface area compared with the pristine material. Among them, NaHCO 3 -regulated MIL-100(Fe) achieves the best adsorption performance toward xylenol orange (XO), which originates from its optimized porous structure. Adsorption experimental data fit well with the pseudo-second-order kinetic model and Langmuir isotherm model. The maximum monolayer adsorption capacity calculated by the Langmuir model reaches 155.28 mg/g, which is competitive with many reported adsorbents. Synergistic adsorption mechanisms, including pore-filling effect, hydrogen bonding, Fe 3+ complexation and π-π stacking interactions, have been elucidated. This work presents a facile mineralizer-mediated strategy for tuning the solid-state structural features of MIL-100(Fe), offering experimental insights for the structure-performance optimization of Fe-based MOF solids. Download: Download high-res image (357KB) Download: Download full-size image
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高影响因子
Micro & Nano Letters
·
2021
·Vol. 16
·期 10
·500-505
·
IF 1.102
Dejuan Fa,Yuqing Miao
By hydrothermal reaction, the hydrangea-like ZnS/ZnIn 2 S 4 microspheres were prepared in the presence of thioacetamide. X-ray photoelectron spectroscopy and high resolution transmission electron microscopy confirmed that the ultra-long nanowires are composed of ZnS and ZnIn 2 S 4 . Scanning electron microscopy showed the morphology of ultra-thin nanosheets with an average thickness of 8.5 nm cross from inside to outside, forming ZnS/ZnIn 2 S 4 microspheres with a porous diameter of about 2.8 μm. Nitrogen adsorption desorption isotherm determined that the BET specific surface area of the microspheres was 109.19 m 2 /g which showed that they have a large specific surface area. The obtained ZnS/ZnIn 2 S 4 microspheres showed broad absorbance ranging from UV (200 nm) to visible (520 nm) with low indirect band gaps of 2.08 eV. It leads to outstanding visible-light-driven photocatalysis for the degradation of xylenol orange (XO) and thymol blue (TB) in water, and the two dyes were almost completely degraded after 60 and 135 min, respectively. This provides new potential to explore nanomaterials for efficient photo-driven degradation of organic dyes under visible light irradiation.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Analytical Methods
·
2024
·
IF 2.7
Rui Jiang,Jinfeng Wang,Bin Feng,Panpan Mou,Shuo Zhou,Xianbo Zhang,Yan Zhou,Guosong Chen,Donghai Lin
We have developed a novel fluorescence sensor based on upconversion nanoparticles (UCNPs) for the rapid and sensitive detection of trace aluminum ions (Al³⁺). The sensor utilizes the inner filter effect (IFE) between the UCNPs and the xylenol orange-aluminum complex (XO-Al³⁺), resulting in significant fluorescence quenching at 543 nm upon Al³⁺ binding. This quenching correlates directly with the Al³⁺ concentration, allowing for quantitative detection within a range of 0–30 µM and achieving an ultra-low detection limit of 0.19 µM. Selectivity of the sensor is enhanced by the incorporation of ascorbic acid, which masks interfering Fe³⁺ ions, thus ensuring accurate determination of Al³⁺ even in the presence of other metal ions. The UCNPs-XO sensor exhibits excellent stability, reproducibility, and minimal interference from commonly co-existing substances. This makes it suitable for the detection of Al³⁺ in various matrices, including food products and environmental water samples. Our work offers a significant advancement in Al³⁺ detection, with potential applications in food safety, environmental monitoring, and public health.
研究领域:
分析化学
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环境科学
·
食品安全
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DOI
PubMed
高影响因子
TALANTA
·
2023
·
IF 6.1
Yatian Cao,Xiaolong Gong,Le Li,Huihui Li,Xuanming Zhang,Dong-Yu Guo,Fuxiang Wang,Qinhe Pan
Bacillus anthracis spores can make humans infected with vicious anthrax, so it is significant to detect their biomarker 2,6-pyridinedicarboxylic acid (DPA). The development of dual-modal methods for DPA detection that are more flexible in practical applications remains a challenge. Herein, colorimetric xylenol orange (XO) was modified on fluorescent CdTe quantum dots (QDs) for dual-modal detection of DPA through competitive coordination. After the binding of XO on CdTe QDs via coordination with Cd 2+ , CdTe QDs displayed quenched red fluorescence and the bound XO was presented as red color. The competitive coordination of DPA with Cd 2+ made XO released from CdTe QDs, causing the enhanced red fluorescence of CdTe QDs and the yellow color of free XO. On this basis, DPA was rapidly (1 min) quantified through fluorescent and colorimetric modes within the ranges of 0.1–5 μM and 0.5–40 μM, respectively. The detection limits for DPA were calculated as low as 42 nM and 240 nM, respectively assigned to fluorescent and colorimetric modes. The level of urinary DPA was further measured. Satisfactory relative standard deviations (fluorescent mode: 0.1%–10.2%, colorimetric mode: 0.8%–1.8%) and spiked recoveries (fluorescent mode: 100.0%–115.0%, colorimetric mode: 86.0%–96.6%) were obtained.
研究领域:
生物化学
·
分析化学
·
医学诊断
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DOI
PubMed
高影响因子
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