JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2016
·
IF 3.782
Changkun Liu,Xiaoyan Liang,Ji’an Liu,Xiaobin Lei,Xinzhen Zhao
In this study, a porphyrin functionalized cotton fiber was prepared and investigated for the visual detection and efficient adsorption of cadmium (Cd 2+ ) ions in aqueous solutions. The pristine cotton fiber was first grafted with poly (3-sulfopropyl methacrylate potassium salt) (PSMP) via the surface-initiated atom transfer radical polymerization (SI-ATRP), and subsequently immobilized with 5,10,15,20-tetrakis(1-methy-4-pyridinio)porphyrin tetra(p-toluenesulfonate) (TMPyP), to form the CPT (Cotton-PSMP-TMPyP) material. The CPT was characterized by SEM, FTIR, XPS and elemental analysis, and examined for the detection and adsorption of cadmium ions. The influencing factors such as pH and the initial cadmium ion concentrations on the adsorption performances were investigated. Results showed that the cadmium ion adsorption isotherm was best fitted with the Langmuir isotherm model, with the derived maximum adsorption capacity of 0.8638 mmol/g. The thermodynamic study showed the endothermic nature of the adsorption process. In addition, the adsorption kinetics was fast with over 90% of the total cadmium ions adsorbed within 2 min. Furthermore, the distinctive color response of the CPT to the cadmium ions in aqueous solutions was clearly displayed. A linear relationship between the light absorbance of CPT-Cd (CPT adsorbed with cadmium ions) and the initial concentrations of cadmium ions was successfully established, which could be used for the fast determination of the cadmium ion concentrations in aqueous solutions.
研究领域:
环境科学
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材料科学
·
化学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2018
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IF 2.88
Si-Nan Wang,Jian Zhu,Xin Li,Jian-Jun Li,Jun-Wu Zhao
Cadmium-caused environmental pollution and diseases have always been worldwide problems. Thus it is extremely urgent to establish a cheap, rapid, simple and selective detection method for trace cadmium in drinking water . In this study, a fluorescence “turn-on” method based on ethylene diamine tetraacetic acid (EDTA)-etched CdTe@CdS quantum dots (QDs) was designed to detect Cd 2+ . High resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) were utilized for chemical and structural characterization of the as-prepared QDs. Based on chemical etching of EDTA on the surface of CdTe@CdS QDs, specific Cd 2+ recognition sites were produced, and then results in fluorescence quenching . The introduction of Cd 2+ could identify these sites and restore the fluorescence of the EDTA-QDs system. Under the optimum conditions, the nanoprobe shows a linear response range from 0.05 to 9 μM with a very low detection limit of 0.032 μM. In addition, the reported fluorescence probe in this work displays a good selectivity for trace Cd 2+ over other metal ions and an admirable practicability in real water samples.
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Haodong Sun,Nannan Xia,Zhongming Liu,Fangong Kong,Shoujuan Wang
We successfully absorbed the copper ion (Cu 2+ ) and cadmium ion (Cd 2+ ) from alkaline aqueous solutions using the prepared chitosan-tannin (CTS/TA) functional paper as absorbent materials. The kinetics of the adsorption, the adsorption isotherms, and the influence of the solution flow rate and pH were investigated detailly. The adsorption data were described well by Langmuir isotherms, with maximum copper (Cu 2+ ) and cadmium (Cd 2+ ) adsorption capacities of 684.93 and 813.01 mg/m 2 , respectively. The experimental results also showed that the adsorption of these heavy metals was selective in the order of Cu 2+ > Cd 2+ , as Cu 2+ competed with Cd 2+ for bonding sites at solution concentrations greater than or equal to 200 mg/L. The results of this study illustrated that the chitosan-tannin functional paper materials mainly followed a complexation-adsorption model, and the best adsorption capacity was achieved at pH = 9. The desorption of heavy ions from this adsorbent and its reusability of functional paper was also involved. Therefore, this novel, environment-friendly functional paper can surely act as an effective adsorbent for the removal and recovery of heavy metals in alkaline aqueous solutions.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
ANALYST
·
2016
·Vol. 141
·期 20
·5886-5892
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IF 4.033
Jing Wang,Chenxing Jiang,Xiaoqi Wang,Ligeng Wang,Aimin Chen,Jun Hu,Zhihui Luo
In this work, we have fabricated a new dual-emission quantum dot (QD) nanohybrid for fluorescence ratiometric determination of cadmium ions (Cd2+) in water samples, where the “turn-on” model and “ion-imprinting” technique were incorporated simultaneously. The nanohybrid probe was composed of green-emitting CdSe QDs covalently linked onto the surface of silica nanoparticles embedded with red-emitting CdTe QDs. The chemical etching of ethylene diamine tetraacetic acid (EDTA) at the surface produced specific Cd2+ recognition sites and quenched the green fluorescence of outer CdSe QDs. Upon exposure to different amounts of Cd2+, the green fluorescence was gradually restored, whereas the inner red fluorescence remained constant. As a consequence, an obviously distinguishable fluorescence color variation (from red to green) of the probe solution was observed. Under the optimized conditions, the developed ratiometric sensor displayed a linear response range from 0.1 to 9 μM with a detection limit of 25 nM (S/N = 3) for Cd2+, which could offer an alternative sensing approach for the highly sensitive and selective detection of heavy metal ions.
研究领域:
分析化学
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材料科学
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 14
·1462-1470
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IF 3.532
Jian Hua Wang,Yao Ming Liu,Jian Bin Chao,Yu Wang,Hui Wang,Shao Min Shuang
A new phenazine-imidazole based Schiff base (PIS) fluorescent probe has been developed for the ratiometric detection of Cd2+ ions in aqueous media at physiological pH. PIS upon binding with Cd2+ ions shows red shifted fluorescence and thereby, permits ratiometric detection of Cd(II) ions. A detection limit down to 2.10 × 10−8 M was determined for Cd2+ quantitation. Also, the accompanying apparent fluorescence color change (from yellow to orange red) is noticeable to the naked eye under a UV-lamp. The sensing mechanism could be attributed to the 1 : 1 PIS–Cd complexation, followed by extension of the conjugation due to better planarity and modulation of the charge transfer efficiency in the probe. This was complemented by solvatochromism and density functional theory calculations. Furthermore, PIS was used to detect Cd2+ in Oxya chinensis cells, zebrafish larvae and live tissues of Arabidopsis thaliana under a fluorescence microscope, showing great potential in analyzing living biosystems.
研究领域:
生物化学
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环境科学
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分子生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2025
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IF 3.3
Huajin Tao,Nan Wang,Yitian Ma,Ahua Xu,Baoyu Huang,Xiaogan Li
This study introduces the development of a portable electrochemical sensor for the detection of Pb(II) and Cd(II) ions based on a screen-printed graphene electrode (SPGE) enhanced with alkalized MXene and gold nanoparticles (AuNPs). Experimental results reveal that the Au@Alk-MXene/SPGE electrode exhibits excellent electrical conductivity, enlarged active surface area, and efficient electron transfer capability, which enhances the electrochemical detection of Pb(II) and Cd(II) ions. Under optimal experimental conditions, the sensor demonstrates good electrochemical response and distinct stripping peaks for both ions. The linear detection range of the sensor is 5-130 μg L⁻¹ for both Pb(II) and Cd(II), with detection limits of 0.198 μg L⁻¹ for Pb(II) and 0.106 μg L⁻¹ for Cd(II). Furthermore, the sensor shows excellent repeatability with relative standard deviations (RSDs) of 1.16% (n = 10) for Pb(II) and 1.25% (n = 10) for Cd(II), as well as remarkable reproducibility with RSD values of 1.56% for Pb(II) and 1.57% for Cd(II). The sensor was successfully applied to analyze tap water and lake water samples, demonstrating satisfactory recovery rates. This research shows the use of MXenes and AuNPs to modify SPGE electrodes, offering a rapid and portable electrochemical sensor for detecting Pb(II) and Cd(II) ions in water.
研究领域:
环境科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CONTROL
·
2019
·
IF 4.248
Xueke Li,Qiaoying Ming,Rui Cai,Tianli Yue,Yahong Yuan,Zhenpeng Gao,Zhouli Wang
The pollution of heavy metals in fruit juice is still increasing and becoming a significant food safety issue worldwide nowadays. In this work, twelve strains of lactic acid bacteria (LAB) were evaluated for the biomass and their capability to adsorb Cd 2+ and Pb 2+ . One strain of LAB capable of efficiently adsorbing heavy metals in apple juice was screened. The obtained LAB was functionalized by magnetic Fe 3 O 4 nanoparticles (MNPs) and modified by Ethylenediaminetetraacetic acid dianhydride (EDTAD) for generation EDTAD-MNPs-LAB (EMB) adsorbent, which was further characterized by Scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The results indicated that the strain of LAB was successfully functionalized and modified by MNPs and EDTAD. The maximum adsorption capacity of EMB adsorbent for Cd 2+ and Pb 2+ in apple juice was 0.57 mg/g and 0.17 mg/g, respectively. The EMB adsorbent could be rapidly separated from the sample solution with the help of magnetic field and the adsorption process has no significant impact on the quality of fruit juice. The regeneration experiments revealed that the EMB adsorbent could be successfully reused. The research provides a new insight and strategy for the effective adsorption and removal of heavy metals from juice.
研究领域:
食品科学
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环境生物学
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微生物学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2016
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IF 5.31
Hongxiu Dai,Nan Wang,Donglei Wang,Houyi Ma,Meng Lin
An electrochemical sensor was developed for detecting heavy metal ions by using a phytic acid functionalized polypyrrole (PPy)/graphene oxide (GO) modified electrode. PPy/GO nanocomposites were synthesized by in situ chemical oxidation polymerization. The PPy/GO nanocomposites were functionalized with phytic acid (PA) molecules by electrostatic attraction. The structural features of the fabricated nanocomposites were confirmed by transmission electron microscopy (TEM), attenuated total reflection infrared (ATR-IR) spectroscopy and Raman spectroscopy. The PA/PPy/GO modified electrode exhibited high electrochemical conductivity, and produced a remarkable increase in peak current compared with the PPy/GO and PA/GO modified electrodes. The developed sensor was used for the electrochemical analysis of various trace metal ions by differential pulse voltammetry (DPV). The modified electrode demonstrated to measure Cd(II) and Pb(II) with a linear working range of 5–150 μg/L. This work demonstrated a simple, rapid and high performing electrochemical strategy for high-sensitivity detection of heavy metal ions.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2021
·Vol. 18
·期 21
·11413
·
IF 3.39
Changheng Li,Qing Huang,Haixiang Zhang,Qingqing Wang,Rixin Xue,Genmao Guo,Jie Hu,Tinghang Li,Junfeng Wang,Shan Hu
Reuse of waste from Hami melon (cantaloupes) straws (HS) mingled with polypropylene (PP) ropes is necessary and beneficial to mitigate environmental pollution. The objective of this study was to investigate the characteristics and mechanisms of Cd2+adsorption on biochars produced by co-pyrolysis of HS-PP with various mixing ratios. N2-sorption, scanning electron microscopy (SEM), energy dispersive X-ray spectrometer (EDS), elemental analysis, Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermal gravity, and differential thermal gravity (TG/DTG) were applied to evaluate the physicochemical properties of materials. Batch adsorption experiments were carried out for investigating the effects of initial pH, Cd2+concentration, and adsorption time. It was found that the Langmuir and pseudo-second-order models fitted best for the experimental data, indicating the dominant adsorption of co-pyrolysis biochars is via monolayer adsorption. Biochar derived at 4/1 mixing ratio of HS/PP by weight percentage had the highest adsorption capacity of 108.91 mg·g−1. Based on adsorption isotherm and kinetic analysis in combined with EDS, FTIR, and XRD analysis, it was concluded that the main adsorption mechanism of co-pyrolysis biochar involved the surface adsorption, cation exchange, complexation of Cd2+with surface functional groups, and chemical precipitation. This study also demonstrates that agricultural wastes to biochar is a sustainable way to circular economy.Keywords:Hami melon straw;polypropylene;co-pyrolysis;biochar;Cd2+
研究领域:
环境科学
·
农业科学
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产品关联
DOI
PubMed
高影响因子
INORGANICA CHIMICA ACTA
·
2022
·
IF 3.118
Yuwei Dong,Jialin Ma,Zhou Yu,Xinxin Liu,Zhen Zhao
Herein, we report a reversible and easy assembled fluorometric probe (4-(quinolin-2-ylmethylene)aminoanisole, QMAA ) for the highly selective and sensitive detection of cadmium ion (Cd 2+ ) in DMF solution with PBS buffer (0.01 M, pH = 7.30). The strong fluorescence response of QMAA to Cd 2+ along with a bright blue fluorescence was mainly ascribed to the formation of the complex QMAA–CdCl 2 . The results show that the complexation can inhibit the C N isomerisation and photo–induced electron transfer (PET), and further lead to the occurrence of chelation fluorescence enhancement. The 1:1 stoichiometry of the complex between QMAA and cadmium ion was studied by fluorescence titration, Job’s plot analysis, 1 H NMR, FT–IR, and ESI–MS data, and was further confirmed by the single crystal structure of the complex QMAA–CdCl 2 . Density functional theory (DFT) calculations have verified the mechanism of fluorescence enhancement. In addition, the limit of detection of QMAA for Cd 2+ was as low as 0.1547 µM (at 10 –7 M level), which was lower than the acceptable limit of Cd 2+ level in drinking water defined by World Health Organization. The analog experiments about nature contamination of Cd 2+ in real samples were finished.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOILS AND SEDIMENTS
·
2022
·Vol. 22
·期 7
·2062-2075
·
IF 3.536
Li Dandan,Wang Peifang,Wang Xun,Hu Bin
Purpose Owing to urbanization and industrial pollution, co-contamination of triphenyl phosphate (TPhP) and heavy metals is ubiquitous in aquatic sediments. However, the influence of coexisting heavy metals on TPhP transport remains unclear. Therefore, it is necessary to investigate the influence of coexisting heavy metals (Cd 2+ ) on the behaviors of TPhP on sediments. Methods Mathematical equations were used to describe the adsorption/desorption process of TPhP on different sediments in the presence of Cd 2+ , and the underlying mechanism was proposed at the molecular level. Results The Fourier-transform infrared (FTIR) spectra showed that Cd 2+ could complex with P = O of TPhP, interact with oxygen-containing functional groups of sediments, which generated additional sorption sites for TPhP, and modified sediments properties. Therefore, the sorption amount of TPhP on sediments was promoted at 10 μmol L −1 Cd 2+ . Furthermore, Cd 2+ could also compete for sorption sites against TPhP. At 100 μmol L −1 Cd 2+ , the adverse effect overpassed the facilitatory effect caused by Cd 2+ , leading to the decrease of sorption amounts of TPhP. Additionally, the redundancy analysis indicated that the sorption amount of TPhP with Cd 2+ coexisting had a positive correlation with sediment organic matter (SOM), C/H, and zeta potential of sediments. With regard to desorption, organic matter condensed by Cd 2+ , and the complexes formed by TPhP with Cd 2+ , slowed down the diffusion rate, and increased the possibility of the entrapment of TPhP in holes. Conclusion The sorption amounts of TPhP on sediments were increased at low Cd 2+ concentration, and decreased at high Cd 2+ concentration. Furthermore, the presence of Cd 2+ could exacerbate the TPhP hysteresis on sediments. This research provides more comprehensive information on TPhP behaviors and facilitates more accurate assessment of the ecological risks posed by TPhP in sediments contaminated with heavy metals. Graphical abstract
研究领域:
环境科学
·
污染生态学
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产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Tan Qiren,Li Xiaoying,Wang Lumei,Zhao Jie,Yang Qinyan,Sun Peng,Deng Yun,Shen Guoqing
Cadmium (Cd2+) and mercury ions (Hg2+) are essential for the quality control of food samples because of their serious toxicity to human health, but the effective and simple strategy for their parallel detection remains challenging. In this paper, a rapid and simple parallel detection method for Cd2+ and Hg2+ was developed using carbon dots (CDs) as fluorescent sensors. A one-step hydrothermal method with a single precursor l-arginine as both the carbon and nitrogen sources was employed to prepare nitrogen-doped CDs (N-CDs). N-CDs exhibited a uniform particle size and excitation-independent fluorescence emission. The maximum emission wavelength of N-CDs was observed at 354 nm with the excitation wavelength at 295 nm. The quantum yield of N-CDs reached as high as 71.6% in water. By using sodium diphosphate and phytic acid as masking agents, the fluorescent sensor can be quenched by Cd2+ and Hg2+ in the linear range of 0–26.8 μM and 0–49.9 μM within 5 min. Other common ions in farm products showed no significant effect on the fluorescence intensity of the sensing system. The results demonstrated that the sensing system had good selectivity and sensitivity for Cd2+ and Hg2+. The detection limits for Cd2+ and Hg2+ were 0.20 and 0.188 μM, respectively. In addition, the fluorescent sensor had been successfully applied for the detection of Cd2+ and Hg2+ in fruits and vegetables, and the recoveries were 86.44–109.40% and 86.62–115.32%, respectively. The proposed fluorescent sensor provides a rapid, simple, and sensitive detection method for Cd2+ and Hg2+ in food samples and thus a novel quantitative detection method for heavy metal ions in foods.
研究领域:
分析化学
·
食品安全
✓ 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）