FOOD CHEMISTRY
·
2024
·
IF 8.5
Xuelin Wen,Fengjing Cao,Chongshan Yang,Zhen Gao,Hongwu Tian,Xiande Zhao,Lianbo Guo,Shixiang Ma,Daming Dong
The detection of heavy metals in tea infusions is important because of the potential health risks associated with their consumption. Existing highly sensitive detection methods pose challenges because they are complicated and time-consuming. In this study, we developed an innovative and simple method using Ag nanoparticles-modified resin (AgNPs-MR) for pre-enrichment prior to laser-induced breakdown spectroscopy for the simultaneous analysis of Cr (III), Cu (II), and Pb (II) in tea infusions. Signal enhancement using AgNPs-MR resulted in amplification with limits of detection of 0.22 μg L −1 for Cr (III), 0.33 μg L −1 for Cu (II), and 1.25 μg L −1 for Pb (II). Quantitative analyses of these ions in infusions of black tea from various brands yielded recoveries ranging from 83.3% to 114.5%. This method is effective as a direct and highly sensitive technique for precisely quantifying trace concentrations of heavy metals in tea infusions.
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高影响因子
DESALINATION
·
2025
·
IF 9.8
Yuting Cui,Yue Zhou,Mingqian Cheng,Wei Fang,Yaoling Wang,Chao Chen,Tingting Liu,Bin Li,Zewei Liu
The escalating contamination of water resources by toxic heavy metals necessitates sustainable remediation strategies. This study presents a novel adsorbent, RHC-180/0.5, synthesized via a one-step hydrothermal carbonization under mild conditions, utilizing red mud (RM) and spent coffee grounds (SCG) as raw materials. The biopolymers in SCG, including cellulose, hemicellulose, and lignin, transformed into hydroxyl, carboxyl, and phenolic groups, enhancing the material's adsorption capacity. Batch adsorption experiments showed optimal performance under alkaline conditions. To minimize precipitation interference, the adsorption mechanism was further investigated at pH = 6. Pseudo-second-order kinetics and Freundlich isotherm models indicated chemical adsorption and heterogeneous multilayer adsorption, respectively. Simultaneously, the Langmuir model yielded maximum theoretical adsorption capacities of 302.33 mg/g and 154.97 mg/g for Pb(II) and Cd(II), respectively, confirming the excellent adsorption performance of RHC-180/0.5. Intraparticle diffusion model analysis showed that surface diffusion dominated in the three-phase adsorption process. Thermodynamic analysis confirmed that the adsorption process was endothermic. Spectroscopic analysis validated the roles of chemical precipitation, ion exchange, and cation-π interactions, surface complexation, and redox reactions in the adsorption mechanism. At pH = 6, RHC-180/0.5 retained approximately 80 % of its initial removal efficiency after ten regeneration cycles, demonstrating excellent stability and reusability. This work highlights a sustainable, cost-effective approach to converting agricultural and industrial waste into high-performance adsorbents for heavy metal-contaminated wastewater treatment.
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CHEMOSPHERE
·
2022
·
IF 8.943
Mu Li,Jingwen Luo,Jianjiang Lu,Wentao Shang,Jiale Mu,Feiyun Sun,Zijun Dong,Xiaoyan Li
A novel Polyacrylonitrile (PAN) composite membrane involving ZIF-8 nanoparticles , named as ZIF-8/PAN membrane, was obtained via electrospinning to remove the Congo red (CR), Pb(II) and Cu(II) ions in industrial wastewaters , during which the adsorption mechanisms were examined in this study. The adsorption efficiency of the electrospun ZIF-8/PAN membrane was as high as 89%, 92% and 76% for CR, Pb(II) and Cu(II), respectively. Comparative analysis showed that ZIF-8 nanoparticles embedded in the ZIF-8/PAN membrane accounted for these enhanced adsorption capabilities. The adsorption behaviors of the ZIF-8 nanoparticles were investigated through experiments and theoretical analysis, and the results unraveled that the adsorption for CR by the ZIF-8 was mainly including electrostatic interaction, hydrogen bonding and π − π interaction, while those for Pb(II) and Cu(II) were mainly caused by ion-exchange and chemical adsorption. Parametric studies were conducted to optimize the conditions for removing CR, Pb(II), and Cu(II) by ZIF-8 nanoparticles, during which all of pollutants showed different reactions to the solution pH. This work not only develops a novel ZIF-8/PAN composite membrane for effective removals of pollutants, but also reveals the underlying mechanisms of pollutants adsorption in terms of molecular interactions, providing important understandings on fibrous materials design for efficient heavy metals and dyes removals in industrial wastewater treatment .
研究领域:
环境科学
·
材料科学
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Haixin Xia,Yaohong Zhang,Qian Chen,Renrong Liu,Hai Wang
Two functionalized biochar composites (ZF@CBC and SZF@CBC) were fabricated and applied for capturing Pb(II) and Cd(II) from wastewater. SZF@CBC were achieved by loading Zn/Fe nanoparticles (NPs) and coating starch onto corn cobs biochar (CBC) surface, while ZF@CBC was realized by loading Zn/Fe NPs onto CBC surface. The characterization analysis (SEM-EDS, XRD and FTIR) revealed that Zn/Fe NPs and starch were successfully introduced onto CBC surface. The adsorption data of Pb(II) and Cd(II) by ZF@CBC and SZF@CBC conformed to the model of pseudo second order kinetic and Langmuir isothermal and the capture Pb(II) and Cd(II) was a chemisorption process. The maximum sorption capacities of SZF@CBC for Pb(II) and Cd(II) reached 199.98 mg/g and 183.93 mg/g, which were 3.37 and 3.84 times high as that of CBC, respectively. Due to the presence of plentiful exposed adsorption sites (–OH, –COOH, Zn-O and Fe-O) on SZF@CBC surface, which endowed it to accelerate Pb(II) and Cd(II) adsorption. In addition, complexation, electrostatic attraction, ion exchange and physical adsorption took part in the adsorption process. Besides, SZF@CBC still exhibited very good removal capacity for Pb(II) and Cd(II) even in the coexistence of multiple interfering ions and maintained stable adsorption capacity after five consecutive cycles. Therefore, SZF@CBC could be used as an excellent adsorbent for decontaminating Pb(II) and Cd(II) from wastewater with multiple pollutants, and also could be used in resource utilization of biomass waste, which possessed potential applications prospects.
研究领域:
环境科学
·
材料科学
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 12
·4731-4740
·
IF 4.58
Lu Zhiwei,Zhang Junjun,Dai Wanlin,Lin Xueni,Ye Jiaping,Ye Jianshan
The authors report on a disposable sensor for the differential pulse anodic stripping voltammetric (DPASV) determination of the ions Zn(II), Pb(II) and Cu(II). Simultaneous detection is accomplished by using a screen-printed carbon electrode (SPCE) co-modified with an in-situ plated bismuth (Bi)) film and gold nanoparticles (AuNPs). The synergistic effect of the Bi film, and the large surface and good electrical conductivity of the AuNPs strongly assist in the co-deposition of the three ions. Four well-defined and fully separated anodic stripping peaks, at 540 mV for Zn(II), 50 mV for Pb(II), 140 mV for Bi(III) and 295 mV for Cu(II), all vs. Ag/AgCl, can be seen. The modified SPCE was characterized by scanning electron microscopy, X-ray diffraction, cyclic voltammetry and electrochemical impedance spectroscopy. Under the optimized conditions, the sensor has a good response to these ions. The detection limits (at an S/N ratio of 3) are 50 ng·L −1 for Zn(II), 20 ng·L −1 for Pb(II), and 30 ng·L −1 for Cu(II). The method was applied to the determination of the 3 ions in spiked lake water samples.
Schematic of screen-printed carbon electrode (SPCE) co-modified with a bismuth film and gold nanoparticles for electrochemical simultaneous determination of Zn(II), Pb(II) and Cu(II) by differential pulse anodic stripping voltammetric (DPASV).
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RSC Advances
·
2015
·Vol. 5
·期 94
·77159-77167
·
IF 3.84
Lili Xiao,Shenghai Zhou,Guangzhi Hu,Hongbo Xu,Yi Wang,Qunhui Yuan
A novel nanoporous carbon material (NPC) was prepared by simple pyrolysis of an isoreticular metal–organic framework-8 (IRMOF-8) at 1000 °C. The obtained NPC possessed a three-dimensional hierarchy of micro-, meso-, and macropores, a high surface area of 1715 m2 g−1 and a large pore volume of 1.70 cm3 g−1. By using Nafion and bismuth films as co-modifiers, the obtained NPC was further used for the fabrication of a sensitive NPC–Nafion/bismuth composite modified glassy carbon electrode (NPC–Nafion/Bi/GCE) for electrochemical determination of Pb(II) in aqueous solution. The synergistic effect of the Nafion and Bi films, as well as the high activated surface area, hierarchical porous texture, and good electrical conductivity of the NPC contributed to the enhanced electrochemical response of Pb(II) at the NPC–Nafion/Bi/GCE during differential pulse anodic stripping voltammetry. Under the optimum conditions, the fabricated electrode exhibited two linear ranges varying from 1–7 μg L−1 and 7–70 μg L−1, respectively. The detection limit was estimated to be 0.8 μg L−1 (at a signal-to-noise ratio of 3) for Pb(II), which was about 12 times lower than the guideline value set by the World Health Organization (WHO) for drinking water. The NPC–Nafion/Bi/GCE showed high reproducibility, with relative standard deviations of 6.2% and 3.4% for multiple successive measurements of 10 and 50 μg L−1 Pb(II), respectively. The composite electrode was successfully used in the analyses of Pb(II) in tap-water samples, and good recoveries were obtained for various spiked values.
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WATER AIR AND SOIL POLLUTION
·
2026
·Vol. 237
·期 12
·696
·
IF 3.5
Li Lanlan,Wang Zili,Wang Guanghui,Zhang Xuewen,Deng Nansheng
Widespread contamination by Pb(II) and Cd(II) poses persistent environmental and public health risks, while achieving selective removal with a clear mechanistic understanding in multicomponent systems remains challenging. Herein, a MgFe-MoS₄-LDH/BC hybrid composite was synthesized via co-precipitation followed by MoS₄ 2 ⁻ intercalation to regulate interlayer chemistry and introduce sulfur-based active sites. Adsorption kinetics followed a pseudo-second-order model, and equilibrium data were well described by the Langmuir model, indicating dominant chemisorption. Under optimized conditions (C₀- Pb = 100 mg/L, C₀- Cd = 20 mg/L, pH = 6.0, dosage = 0.2 g/L), the composite achieved removal efficiencies of 99.53% for Pb(II) and 85.71% for Cd(II). In binary systems, Pb(II) showed stronger competitive behavior, exhibiting only a 4.7% capacity reduction compared to 9.4% for Cd(II). Thermodynamic analysis confirmed that adsorption was spontaneous and endothermic. Combined XRD, FTIR, XPS, and density functional theory (DFT) analyses revealed that metal immobilization was governed by complexation with oxygen- and sulfur-containing groups, surface precipitation (Pb₂(SO₄)O and Cd(OH)₂), and electrostatic attraction. DFT calculations further demonstrated stronger Pb–S interactions, explaining preferential Pb(II) adsorption. The composite maintained high stability after five regeneration cycles, and key scientific challenges and future innovation pathways are summarized to guide practical application. This work provides a rational strategy for designing selective LDH-based composites for heavy-metal remediation.
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FOOD CONTROL
·
2021
·
IF 5.548
Weixia Yang,Jinmeng Wang,Yong Han,Xueli Luo,Wenzhi Tang,Tianli Yue,Zhonghong Li
Pb(II), a highly toxic heavy metals that targets the human nervous system, has contaminated water and food in recent years. The nanomaterial of Metal–organic frameworks (MOFs) possesses superior removal performances. However, their practical application is limited by their nature of fine powdery. Herein, we developed robust MOFs film without the adding of polymer in MOFs ink and the modification of the substrate, which was achieved by choosing appropriate substrate of gelatin hydrogel with functional groups and simple thermal-treatment after coating UiO-66-NO 2 onto gelatin hydrogel. The volatilization of the UiO-66-NO 2 dispersant ethyl acetate promotes the rearrangement and dense accumulation of UiO-66-NO 2 crystals to form a dense UiO-66-NO 2 film. During the following thermal-treatment process, –COOH of UiO-66-NO 2 and –NH 2 of gelatin chemically reacted to establish the stable composites of UiO-66-NO 2 film and gelatin hydrogel. The results of batch adsorption experiments demonstrate that adsorption behaviors of the as-synthesized gelatin/UiO-66-NO 2 film composite hydrogels can be explained by the pseudo-second-order kinetic model and the Langmuir isotherm model, stating that this adsorption process involves with a chemical monolayer adsorption. Besides, gelatin/UiO-66-NO 2 film composite hydrogels own satisfactory removal efficiency for Pb(II) in apple juice, and the adsorption process has little impairment on the quality of apple juice. These results suggest that MOFs film is suitable for water decontamination and food safety control fields.
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高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2021
·Vol. 22
·期 12
·6540
·
IF 5.924
Xu Zhang,Tao Du,He Jia
In this study, four different coal fly ashes (CFAs) were used as raw materials of silica and alumina for the preparation of the alumina-containing Mobil Composition of Matter No. 41 (Al-MCM-41) and the exploration of an activation strategy that is efficient and universal for various CFAs. Alkaline hydrothermal and alkaline fusion activations proceeded at different temperatures to determine the best treatment parameters. We controlled the pore structure and surface hydroxyl density of the CFA-derived Al-MCM-41 by changing the crystallization temperature and aging time. The products were characterized by small-angle X-ray diffraction, nitrogen isotherms, Fourier-transform infrared spectroscopy,29Si silica magic-angle spinning nuclear magnetic resonance, and transmission electron microscopy, and they were then grafted with thiol groups to remove Pb(II) from aqueous solutions. This paper innovatively evaluates the CFA activation strategies using energy consumption analysis and determines the optimal activation methodology and parameters. This paper also unveils the effect of the crystallization condition of Al-MCM-41 on its subsequent Pb(II) removal capacity. The results show that the appropriate selection of crystallization parameters can considerably increase the removal capacity over Pb(II), providing a new path to tackle the ever-increasing concern of aquic heavy-metal pollution.Keywords:coal fly ash;CFA activation;Al-MCM-41;crystallization parameters;Pb(II) removal capacity
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高影响因子
IONICS
·
2020
·Vol. 27
·期 1
·375-387
·
IF 2.394
Wei Shou-lian,Yan Liang-jie,Huang Xiang-jin,Li Jian-wen,Yao Su,Zhang Hua-sheng,Xu Ai-zhen
This work describes the development of a simple, effective, and sensitive electrochemical sensor based on a glassy carbon electrode (GCE) modified with carboxylated carbon nanosheets (cCNSs) and poly(glutamic acid) (PGA) for the simultaneous detection of trace amount of Cd(II) and Pb(II) by differential pulse anodic stripping voltammetry (DPASV). The cCNSs were introduced to increase the effective surface area and electron transport efficiency of the sensor, while PGA acting as a capturer could capture target metal ions and eventually enhance the selectivity and sensitivity in the detection of Cd(II) and Pb(II). The designed sensor showed a linear range of 1.0–100.0 μg/L for both metal ions, with detection limits (S/ N = 3) of 0.13 μg/L for Cd(II) and 0.15 μg/L for Pb(II), respectively. The sensor was applied to the simultaneous detection of Cd(II) and Pb(II) in the water and rice samples, and the results were in good agreement with those obtained by graphite furnace atomic absorption spectrometry (GFAAS). It also gave excellent performance with regard to its selectivity, recovery, stability, and reproducibility.
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Materials Research Express
·
2019
·Vol. 6
·期 9
·095315
·
IF 1.449
Huining Zhang,Qing Chang,Jianping Han,Shiming Gao,Zhiguo Wu,Jiawei Hu,Yahong Yang,Zhiqiang Wei,Dengqi Zhang,Zhangpu Peng
In this work, two novel macroporous hydrogel beads (PVA/GO–N and PVA/CS) were prepared to remove Cu2+ and Pb2+ ions in the solution. The maximum Cu2+ sorption capacities on PVA/GO–N and PVA/CS beads were 96.22 and 74.66 mg g−1, while the counterpart sorption capacities of Pb(II) were 278.16 and 144.53 mg g−1, respectively. Isotherm, kinetics and XPS analysis investigation indicated that the sorption processes were controlled by multiple mechanisms. The Cu(II) and Pb(II) removal rates were influenced by the changes of pH, initial dosage, ionic strength, chelator and co-existed ions. The packed-bed sorption column experiments were also carried out to investigate the operating parameters and the potential of the two adsorbents in large scale adsorption systems in practical use. The kinetic model, Thomas equation, was applied to predict dynamic behavior of the fixed bed column for a successful design of a sorption column.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Hao Wang,Shuai Wang,Shixing Wang,Likang Fu,Libo Zhang
The removal of Cr(VI) and Pb(II) from wastewater is one of the methods to ensure water safety. However, it is still a difficult point to design efficient and selective adsorbent. In this work, Cr(VI) and Pb(II) were removed from water by a new metal–organic frameworks material (MOF-DFSA) with numerous adsorption sites. The max adsorption capacities of MOF-DFSA were 188.12 mg/g for Cr(VI) after 120 min and 349.09 mg/g for Pb(II) within 30 min. MOF-DFSA showed good selectivity and reusability after four cycles. The adsorption of MOF-DFSA was an irreversible process with multi-site coordination, and an active site adsorbed 1.798 Cr (VI) and 0.395 Pb (II). Kinetic fitting showed that the adsorption was chemisorption and surface diffusion was the main limiting step. Thermodynamic showed that Cr(VI) adsorption was enhanced at higher temperatures by spontaneous processes while Pb(II) was weakened. The chelation and electrostatic interaction of the hydroxyl and nitrogen-containing groups of MOF-DFSA with Cr(VI) and Pb(II) is the predominant mechanism, while the reduction of Cr(VI) also play an important role in adsorption. In conclusion, MOF-DFSA was a sorbent that can be used for the removal of Cr(VI) and Pb(II).
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高影响因子
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