Analytical Methods
·
2019
·Vol. 11
·期 40
·5214-5221
·
IF 2.378
Mingyu Tang,Xiaodong Liu,Nannan Zhang,Jingyu Pang,Yu Zou,Fang Chai,Hongbo Wu,Lihua Chen
Herein, nitrogen and sulfur codoped carbon dots (N&S CDs) were prepared by a facile hydrothermal process and they could be introduced as a fluorescent probe for the determination of cadmium ions (Cd2+), yielding high sensitivity and excellent selectivity. The obtained N&S CDs exhibited bright blue fluorescence with a quantum yield of 40% and exhibited a fast responsive fluorescence quenching signal within 2 min toward Cd2+ in both ultrapure water and real water samples. The CDs responded to Cd2+, which acted as a quencher of blue fluorescence at 459 nm with the limit of detection of 0.018 μM in the range of 0.02–1 μM. The quenching fluorescence behavior was found to obey the static quenching effect (SQE). The low toxicity and good cell permeability of CDs were verified by cell experiments.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Shikai Li,Hanbing Gao,Rui Xu,Zhaohui Guo
Cation and oxyanion heavy metals possess opposite physical and chemical properties, which could be hard to simultaneous remediate in soil. In this study, layered double hydroxides from secondary aluminum ash (SAA-LDH) has been synthesized for soil remediation contaminated with heavy metals. The as-obtained SAA-LDH exhibit strong affinity for heavy metals, which could remove 193.50 mg‧g −1 of Cr(Ⅵ) and 175.84 mg‧g −1 of Cd(Ⅱ) within 2 h. Optimum acid-base resistance and selectivity guarantee the practice potential of SAA-LDH, which could remove above 85 % of Cd(Ⅱ) and Cr(Ⅵ) under widely pH range (from 4.00 to 10.00), capturing above 90 % of Cd(Ⅱ) and Cr(Ⅵ) under the interference of seven coexisting ions. Soil remediation tests and column leaching experiments further demonstrate that SAA-LDH could immobilize 98.32 % of Cd(Ⅱ) and 97.71 % of Cr(Ⅵ), preventing its migration. Density functional theory (DFT) manifests that SAA-LDH could remove Cd(Ⅱ) and Cr(Ⅵ) through isomorphic substitution and ion exchange respectively under single system. Under compound system, Cd(Ⅱ) fixed with isomorphic substitution could promote the immobilization of Cr(Ⅵ) onto SAA-LDH, constructing hyper-stable coordination structure. This study provides an effective approach to simultaneously recycle hazardous waste and remediate heavy metals contamination in soil.
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ELECTROPHORESIS
·
2015
·Vol. 36
·期 17
·2120-2127
·
IF 3.028
Lu Yangfang,Wang Hui,Xue Yun,Gu Xue,Wang Yan,Yan Chao
Submicron, non-porous, chiral silica stationary phase has been prepared by the immobilization of functionalized β-CD derivatives to isocyanate-modified silica via chemical reaction and applied to the pressurized capillary electrochromatography (pCEC) enantio-separation of various chiral compounds. The submicron, non-porous, cyclodextrin-based chiral stationary phases (sub_μm-CSP2) exhibited excellent chiral recognition of a wide range of analytes including clenbuterol hydrochloride, mexiletine hydrochloride, chlorpheniramine maleate, esmolol hydrochloride, and metoprolol tartrate. The synthesized submicron particles were regularly spherical and uniformly non-porous with an average diameter of around 800 nm and a mean pore size of less than 2 nm. The synthesized chiral stationary phase was packed into 10 cm × 100 μm id capillary columns. The sub_μm-CSP2 column used in the pCEC system showed better separation of the racemates and at a higher rate compared to those used in the capillary liquid chromatography mode (cLC) system. The sub_μm-CSP2 possessed high mechanical strength, high stereoselectivity, and long lifespan, demonstrating rapid enantio-separation and good resolution of samples. The column provided an efficiency of up to 170 000 plates/m for n -propylbenzene.
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Materialia
·
2025
·
IF 2.9
Jiaxuan Wang,Jun Pan,Han Wu
This study aims to develop PVDF composite membranes with excellent comprehensive performance by hydrophilic modification of PVDF membranes. Specifically, polyvinylpyrrolidone (PVP) was used as a porogen and dispersing agent, while β-cyclodextrin (β-CD) and chitosan (CS) served as hydrophilic modification agents. A novel β-CD/CS/PVDF composite membrane was prepared using a blending phase transformation method. This membrane exhibits excellent hydrophilicity, underwater superoleophobicity, mechanical strength, self-cleaning ability, antibacterial performance, high separation performance, and biocompatibility. The experimental results indicate that the modified membrane with the optimal ratio (MF-β/C-2/3) achieved a pure water flux of 721.79 L·m −2 ·h −1 ·bar −1 , an underwater oil contact angle exceeding 140°. The membrane exhibited exceptional retention and separation capabilities for various concentrations of MB, MG, RB, MO, Pb 2+ , and Cr 6+ . It achieved a separation efficiency exceeding 99% for both oil-water mixtures and oil-water emulsions, and also demonstrated excellent separation performance when treating simulated wastewater containing multiple pollutants. In addition, ten cycles of separation experiments were conducted for organic dyes, heavy metal ions, oil-water mixtures, oil-water emulsions and simulated wastewater respectively. The results showed that after ten cycles of reuse, the modified membrane retained good separation efficiency and water flux, demonstrating exceptional separation stability. Research has shown that PVDF composite membranes have a promising prospect in the treatment of printing and dyeing wastewater. They can simplify the process flow, reduce costs, efficiently intercept pollutants, increase operational stability, and improve treatment efficiency. They have important practical significance in promoting the resource utilization of printing and dyeing wastewater.
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Environmental Technology & Innovation
·
2025
·
IF 7.1
Caiyun Fei,Mengmeng Zhu,Xiazhen Gan,Rong Zhang,Rui Liang,Weihua Peng,Xianjin Tang,Wenling Ye
The co-contamination of cadmium (Cd) and arsenic (As) in agricultural soils threatens ecosystem safety and human health via food crop accumulation. However, simultaneous remediation of Cd and As remains challenging due to their opposing chemical behaviors. Microbial-induced carbonate precipitation (MICP) is a promising technology for heavy metal remediation. In this study, we developed a novel bioremediation strategy by employing newly isolated Rummelibacillus sp. (ANY-1) and Rummelibacillus pycnus (ANY-2) for simultaneous immobilization of Cd and As via MICP. This study systematically investigated and compared the efficacy of ANY-1, ANY-2, and the model strain Sporosarcina pasteurii in immobilizing Cd and As in both aqueous solution and soil. Results revealed that ANY-1, ANY-2 could not only efficiently remove Cd(II) from co-contaminated aqueous solution (75.08%-93.13%), but also achieve considerable removal of As(III) (16.74%-37.32%). In soil incubation MICP remediation resulted in 47.26%-64.09% and 8.12%-25.74% decline in available Cd and As contents, respectively. XRD and FTIR analyses confirmed that the immobilization of Cd(II) and As(III) by the three strains occurred not only via co-precipitation with CaCO₃ but also through mineralization, forming (Ca₀.₆₇, Cd₀.₃₃)CO₃ and Ca₅(HAsO₄)₂(AsO₄)₂·5H₂O. Biomineralization induced by ANY-1 and ANY-2 upregulated soil urease gene and without negative impacts on soil bacterial communities. Further field experiment demonstrated that ANY-1 can effectively reduce the accumulation of Cd(63.4%) and As(24.4%) in rice grains, without compromising yield. Our findings highlight the potential of MICP as an eco-friendly and effective strategy for mitigating the combined ecological and health risks posed by Cd and As co-contamination in soil.
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International Journal of Electrochemical Science
·
2023
·Vol. 13
·期 2
·1423-1440
·
IF 1.5
Ruizhuo Ouyang,Lina Xu,Haifeng Wen,Penghui Cao,Pengpeng Jia,Tian Lei,Xia Zhou,Mei Tie,Xiaolei Fu,Yuefeng Zhao,Haizhou Chang,Yuqing Miao
A novel indium doped bismuth hybrid nanofilm was prepared on a glassy carbon electrode (Bi@In/GCE) and successfully used for the simultaneous measurements of aqueous zinc (Zn(II)), cadmium (Cd(II)) and lead (Pb(II)). The Bi@In hybrid nanofilm was greatly improved in the ability of electron transfer, surface morphology as well as hydrophilicity over single Bi or In film, and exhibited well-defined and separate peaks for Zn(II), Cd(II) and Pb(II) by square wave stripping voltammetry. Analytical characteristics of the developed Bi@In/GCE were explored by comparing with single Bi and In film modified electrodes with calibration curves, which exhibited the most preferable electrochemical behaviors toward three metals as predicted. The synergistic effect of Bi and In mainly contributed to the enhanced electrochemical activity of the new electrode. In the concentration range of 0-120 µg L -1 , a good linear relationship was achieved between the peak current and the metal concentration with correlation coefficient higher than 0.995. The detection limits were calculated to be 0.52, 0.15 and 0.67 µg L -1 for Zn(II), Cd(II) and Pb(II) (S/N=3), respectively. The analysis of river sample with Bi@In/GCE was performed with satisfactory recoveries higher than 98%, suggesting that the new method is promising as a simple, sensitive and efficient approach to detect the heavy metals in water samples.
研究领域:
分析化学
·
环境监测
·
电化学传感
·
纳米材料
·
水污染检测
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Journal of Inorganic and Organometallic Polymers and Materials
·
2013
·Vol. 23
·期 6
·1492-1500
·
IF 1.174
Zhang Nan,Fan Yu-Hua,Bi Cai-Feng,Zhang Xia,Zhang Peng-Fei,Zhang Zhong-Yu,Li Xin
Three novel transition metal coordination polymers, [Ni(C 18 H 16 N 3 O 2 ) 2 ·2CH 3 OH]
n
( 1 ), [Zn(C 18 H 16 N 3 O 2 ) 2 ·4CH 3 OH]
n
( 2 ) and [Cd(C 18 H 16 N 3 O 2 ) 2 ·2CH 3 OH]
n
( 3 ) (C 18 H 16 N 3 O 2 =2-acetylpyridine- d -tryptophan) were synthesized and characterized by elemental analysis, IR, UV, 1 H NMR and X-ray diffraction single crystal analysis. The analyses of the structures indicate that all three materials crystallize in the tetragonal crystal system, space group P 4 1 2 1 2. They have similar structures; i.e., the Schiff base coordinates in its deprotonated form and behaves as a hexadentate (4N+2O) coordinated ligand to form a distorted octahedron geometry. On the other hand, as a result of the alternate arrangement of chains through N–H···O intermolecular hydrogen bonds interactions, 2-D layers are formed for the three complexes. Furthermore, the luminescent properties and thermal stabilities of the three complexes were investigated.
研究领域:
无机化学
·
配位化学
·
材料化学
·
晶体工程
·
光物理化学
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JOURNAL OF COORDINATION CHEMISTRY
·
2026
·
IF 1.6
Wen Su,Ying-Qin Wei,Jianbin Chen,Xue-Jie Tan
A novel asymmetrical bis-Schiff base, (E)-3-(((di(pyridin-2-yl)methylene)hydrazono)methyl)-1-methyl-1H-indole (3DM), incorporating both pyridine and indole units, was synthesized and structurally characterized alongside its two cadmium(II) complexes (3DMCd, p-3DMCd). Comprehensive spectroscopic characterization (elemental analysis, HRMS, NMR, fluorescence) was performed. Both cadmium(II) complexes exhibit visible fluorescence, and p-3DMCd in particular displays intense yellow emission readily observable to the naked eye, indicating its potential as a novel aggregation-induced emissive material. Cytotoxicity assays conducted against A375, A549, and HeLa cancer cell lines, as well as normal HFF-1 fibroblasts, show that the free ligand 3DM is minimally toxic, whereas both cadmium(II) complexes selectively inhibit tumor cell proliferation and display markedly lower toxicity toward normal cells relative to CdCl2. In HeLa cells specifically, both 3DMCd and p-3DMCd exhibit substantially higher cytotoxicity than CdCl2, while maintaining significantly reduced toxicity toward normal cells. These results highlight the potential role of 3DM as a detoxifying ligand and support the promise of its cadmium(II) complexes as low-toxicity, metal-based candidates for anticervical cancer therapy. Given the established significance of DNA in the mechanism of action of metal-based drugs, docking studies were conducted against a DNA target to elucidate the structural basis for the differential potencies exhibited by the three compounds.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Kai Wang,Chunqing Niu,Xin Zhang,Nuo Liu,Zhengxin Luo,Chunhong Zhu,Jian Shi
A mixed mono−/multidentate ligand strategy engineered defective MIL-100(Fe). • Coordinatively unsaturated Fe O sites promoted rapid heavy-metal adsorption. • Defect engineering integrated Fe O exposure and amino functionalization. • Synergistic Fe–O/NH₂/COO − sites enhanced adsorption kinetics and affinity. • A flexible MOF membrane achieved efficient and recyclable heavy-metal removal. To address Pb(II) and Cd(II)-dominated heavy-metal contamination in water, a series of amino-bearing, defect-regulated Fe-based metal-organic frameworks (MOFs) were constructed using ligand engineering. In the synthetic design, the tritopic linker 1,3,5-benzenetricarboxylic acid (H₃BTC) was coupled with the monotopic modulator p-aminobenzoic acid (PABA), enabling the simultaneous generation of coordinatively unsaturated Fe O centers and exposed -NH₂ functionalities within the framework. This dual functionalization substantially strengthened the affinity of the adsorbent for divalent heavy-metal ions. Among the obtained samples, 6 mg Fe(BTC)₈(PABA)₂, corresponding to an H₃BTC/PABA feed ratio of 8:2, delivered the best adsorption performance under the conditions of 25 °C, pH 5, and an initial concentration of 150 mg/L, with maximum uptake values of 732.03 mg/g for Pb(II) and 654.05 mg/g for Cd(II), and equilibrium was achieved within 15 min. Kinetic and equilibrium analyses followed the pseudo-second-order model and Langmuir isotherm, respectively, indicating that monolayer chemisorption dominates the capture process. To improve the handling, recovery, and reusability of Fe(BTC)₈(PABA)₂ particles, they were incorporated into a polyacrylonitrile (PAN) nanofibrous matrix via electrospinning to obtain a Fe(BTC)₈(PABA)₂@PAN membrane. The membrane retained good structural stability and pronounced selectivity, particularly for Pb(II), in both binary-ion media and multi-cationic aqueous systems. After five adsorption-desorption cycles, more than 83% of the initial adsorption capacity was retained. DFT (Density functional theory) calculations further supported the experimental observations, showing that the adsorption originated from cooperative coordination among unsaturated Fe-O-M sites, carboxyl oxygen atoms, and amino nitrogen atoms. Therefore this study provides a defect- and functionality-coupled strategy for developing MOF-based adsorbents with both rapid uptake and high capacity for heavy-metal remediation. Download: Download high-res image (331KB) Download: Download full-size image
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ANALYTICA CHIMICA ACTA
·
2026
·
IF 6.1
Nanke Ma,Anqi Wei,Huiling Peng,Lixia Xie,Yuan Jin,Zhengzhi Yin,Guangli Li
Background Chirality plays a critical role in drug efficacy and environmental safety. The antibacterial activity of ofloxacin resides almost exclusively in its S-enantiomer (levofloxacin, LEV), while the R-enantiomer contributes little to therapeutic effects but may pose unnecessary risks. Rapid and reliable methods for enantioselective determination of ofloxacin enantiomers are therefore essential for pharmaceutical quality control, food safety monitoring, and environmental analysis. However, existing electrochemical sensors often suffer from limited enantioselectivity and insufficient sensitivity. To address this challenge, a novel enantioselective electrochemical platform is developed. Results A β-cyclodextrin/cerium-doped copper metal-organic framework/carboxylated multi-walled carbon nanotube composite (β-CD/Ce-doped Cu-MOF/MWCNTs-COOH) was fabricated on a glassy carbon electrode. The sensor achieves discrimination of ofloxacin enantiomers with an I L /I D ratio of 3.39. DFT calculations at pH 4.0 reveal that β-CD binds LEV with higher adsorption energy (−63.8 kJ/mol) than DEX (−58.3 kJ/mol), confirming the superior response for LEV originates from stereospecific inclusion. Quantitative analysis of LEV shows two linear ranges (0.03–1 μM and 1–10 μM) with a low detection limit of 0.01 μM. The sensor also enables accurate determination of LEV percentage in enantiomer mixtures across 0–100%. Excellent selectivity against common interferents, good reproducibility (RSD = 0.98%), repeatability (RSD = 1.26%), and long-term stability (95.2% retention after 21 days) are demonstrated. Practical applicability is validated by detecting LEV in commercial eye drops, honey, and tap water with satisfactory recoveries (96.0–108.0%). Significance and novelty This work presents the first application of Ce-doped Cu-MOF/β-CD/MWCNTs-COOH composites for the enantioselective electrochemical sensing of ofloxacin, a chiral fluoroquinolone antibiotic. The synergistic combination of high conductivity, abundant catalytic sites, and stereospecific host-guest recognition provides a generalizable strategy for high-performance enantioselective sensing, with promising applications in pharmaceutical, food, and environmental analysis.
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FOOD CHEMISTRY
·
2026
·
IF 10.4
Mingsha Jie,Amei Zhu,Zhendong Liu,Junguang Li,Zeyu Xu,Xiaoyue Yue,Yanhong Bai
γ-CD-MOF@Eu-MOF flower-like probe synthesized for sensitive sulfonamides detection. • Paper-based sensor enables portable, visual on-site testing via smartphone imaging. • Machine learning algorithm boosts detection speed and reliability for quantitation. • The detection limit of the γ-CD-MOF@Eu-MOF for SAs is as low as 25.5 nmol/L. The protection of human health and the guarantee of food safety necessitate rapid and precise identification of sulfonamides (SAs) residues in food. Herein, we propose a fluorescence sensor based on γ-CD-MOF@Eu-MOF, which is used for quantitative and visual detection of SAs. The γ-CD-MOF@Eu-MOF exhibits high selectivity toward SAs, with detection limits for sulfamerazine (SMR), sulfamethazine (SM 2 ), and sulfamethoxydiazine (SMD) as low as 25.5 nmol/L, 36.7 nmol/L, and 39.8 nmol/L, respectively. The fluorescent probes were immobilized on paper substrates to construct a paper-based sensor, which was combined with a smartphone-assisted machine learning algorithm to enable high-throughput, intelligent, and rapid detection of SAs. After optimizing the constructed prediction model, the coefficient of determination can reach 0.99, indicating the accuracy and applicability of the model. Overall, this sensor exhibits excellent stability, sensitivity, and specificity, providing a practical approach for the intelligent, rapid, and high-throughput on-site visual detection of SAs. Download: Download high-res image (163KB) Download: Download full-size image
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xiao-Huan Liang,Yuan Chen,Ao-Gang Liu,Ting Zhu,Zi-Tong Chen,Hui-Xin Xia,Miao Chen,Bao Li
To address environmental remediation challenges from ciprofloxacin (CIP), this study pioneers a ligand pre-metallization strategy diverging fundamentally from conventional post-synthetic approaches. By pre-constructing Fe-N 4 coordination in Fe(III) meso-tetra(4-carboxyphenyl)porphine chloride (H 4 TCPP(Fe)) ligands before assembly with Cd 5 polynuclear clusters, a stable three-dimensional Fe 3+ -doped Cd-TCPP metal-organic framework (MOF) was engineered, overcoming pore collapse limitations in conventional porphyrinic MOFs. This coordination engineering enables triple synergistic mechanisms: (1) Metal-to-ligand charge transfer (MLCT)-enhanced light absorption, (2) built-in electric fields at FeN 4 -Cd 5 heterojunctions reducing charge-transfer resistance, and (3) high-density active sites accelerating hydroxyl radical ( • OH) production. The optimized system achieves near-complete CIP degradation within 25 min (maximum kinetic constant ( k ) = 0.40 min −1 ) under 10 W visible light and ultrafast solar degradation (99.2 % removal in 2.5 min, k = 1.92 min −1 ), surpassing state-of-the-art Fe-TCPP ( k = 0.23 min −1 ). Mechanistic analysis via liquid chromatography-mass spectrometry (LC-MS) revealed piperazine cleavage/defluorination pathways, while ecological structure activity relationships (ECOSAR) verified reduced aquatic toxicity of intermediates. This work establishes a coordination-directed paradigm for precision MOF electronic engineering, offering a scalable solution for antibiotic remediation.
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