JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
·
2025
·
IF 2.1
Nan Zhang,Yang Qiao,Jinrong Zhang,Pengfei Cui,Xufei Liu
Mining-induced heavy metal pollution poses an urgent ecological challenge. Recently, biochar, especially corn stover biochar (CSB) modified with ionic liquids (ILs) for weak interactions, has shown promise in mine water remediation. In this study, we used charred corn stover as biochar and synthesized 1-methyl-3-[3-(trimethoxysilyl) propyl] imidazolium IL as modifier to create imidazolium-based IL-modified biochar. The chemical structure of the IL and the chemical composition of the biochar were analyzed with the help of 1H NMR and FT-IR. Characterization techniques such as XPS, SEM, and nitrogen adsorption–desorption measurements were employed to investigate the elemental composition, surface morphology, pore size, porosity, and other physicochemical properties of the corn straw biochar. Cd2+ was chosen as the representative of heavy metal ions in mine water, and the adsorption kinetics and isotherm experiments were conducted to study the adsorption performance of CSB on heavy metal ions. The results exhibited that the adsorption performance of IL-modified CSB material (Qe = 48.1000 mg/g) for heavy metals was enhanced to a certain extent compared with that of unmodified CSB material (Qe = 44.0000 mg/g). This provided a foundation for using corn straw biochar to remove heavy metals in mine water.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
·
IF 4.6
Yuhan Yang,Lin Liu,Jiao Yu,Yang Zhang,Yuanyue Lu,Yong Mei,Yingying Gu
Heavy metal contamination, especially Pb 2+ and Cd 2+ , poses severe risks to food safety and human health, creating an urgent need for rapid and sensitive detection methods. Herein, a novel tin-based electrochemical sensor with graphitic carbon nitride (g-C 3 N 4 ) and multi-walled carbon nanotubes (MWCNTs) modified glassy carbon electrode (GCE) was developed for the simultaneous detection of Pb 2+ and Cd 2+ in vegetables. The SnO 2 /g-C 3 N 4 @MWCNTs/GCE was systematically characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FT-IR). The synergistic effect of the g-C 3 N 4 @MWCNTs composite and the SnO 2 film effectively facilitated electron transfer and accelerated the response, enhancing sensing performance. Under optimal conditions, the linear range of the sensor for Pb 2+ and Cd 2+ was 10–400 μg·L −1 . The limits of detection (LODs) were 0.40 μg·L −1 and 0.61 μg·L −1 for Pb 2+ and Cd 2+ , respectively. In vegetable samples, the recoveries of Pb 2+ and Cd 2+ in spinach, lettuce, and cabbage were all within the range of 95–105 %. This study provides a new method to quickly, sensitively, and simultaneously detect Pb 2+ and Cd 2+ in vegetables. These findings expand the application of environmentally friendly tin-based electrochemical sensors for actual sample detection.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Jin Yan,Xinyu Zhou,Chenchen Li,Qi Meng,Yingjie Zhang,Peng Dong
Wastewater containing Cu 2+ and Cd 2+ poses a huge threat to the surrounding environment and human safety. To treat such wastewater, this study developed a novel composite adsorbent (LZT 850 @SA) from thermally activated LZT and sodium alginate (SA). LZT was thermally activated at 850°C (LZT 850 ). The composite LZT 850 @SA was synthesized by mixing LZT 850 powder with SA solution under optimized conditions (20°C, 4 g/L SA, 90 min). Adsorption performance for Cu 2+ /Cd 2+ was evaluated under varying pH, contact time, temperature, and concentration. Kinetics, isotherms, selectivity, and regeneration were systematically studied. Activation at 850°C enhanced LZT crystallinity and created pores (SSA: 5.46 m 2 /g). SA compositing formed unique fibrous architectures and amorphous-crystalline interfaces, significantly increasing SSA to 16.31 m 2 /g (BET). XRD confirmed the dominant phases (CaCO 3 , CaO, MgO) in LZT 850 and phase transition upon SA compositing. SEM/HRTEM revealed SA's transformation of the granular LZT 850 surface into a highly porous, roughened morphology with uniform particle distribution. At pH 6, LZT 850 @SA exhibited exceptional adsorption capacities of 223.47 mg/g (Cu 2+ ) and 227.99 mg/g (Cd 2+ ), reaching equilibrium within 120 min. Adsorption followed pseudo-second-order kinetics and Langmuir isotherm models, indicating chemisorption-dominated monolayer adsorption. Mechanisms involved chemical coordination (C=O, O-C=O, O-H, iron oxides), ion exchange, coordination and electrostatic interactions. The composite demonstrated excellent selectivity and retained 81.9% (Cu 2+ ) and 85.52% (Cd 2+ ) adsorption capacity after 5 regeneration cycles. This provides a new strategy for the composite of solid waste and biopolymers, and at the same time offers technical insights for the treatment of heavy metal-polluted wastewater.
研究领域:
环境科学
·
材料工程
·
化学工程
·
水处理技术
·
吸附科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 15
·e202305174
·
IF 1.9
Shihua Liao,Jing Hu,Xiang Long,Shaogui Wu
Graphical This study demonstrates a facile solvothermal approach to synthesizing green fluorescent carbon dots (G-CDs) using baby pumpkin as a natural precursor. The G-CDs, exhibiting strong fluorescence emission, high quantum yield, and excellent stability under various conditions, could be served as a potent label-free probe for Cd 2+ determination This study demonstrates a facile solvothermal approach to synthesizing green fluorescent carbon dots (G-CDs) using baby pumpkin as a natural precursor. The G-CDs exhibit strong fluorescence emission at 547 nm under excitation at 467 nm, and the highest quantum yield reaching 17.5 % in acetone, making them suitable for a range of applications including sensing, bioimaging, catalysis, and drug delivery. The G-CDs demonstrate excellent stability under various conditions, such as prolonged light exposure, high salt concentration, extended periods, and elevated temperatures. Furthermore, the G-CDs show a good linear relationship with Cd 2+ within the concentration range of 0 to 16.5 μmol/L, with a linear correlation coefficient of 0.9920. The detection limit (LOD) was calculated to be 0.68 μmol/L. The recovery rate ranges between 85.66% to 97.43%, indicating their potential for use in environmental metal ion detection. This study provides a convenient and economical method for the synthesis of G-CDs using baby pumpkin as a precursor, offering a sustainable alternative for various applications in sensing, imaging, catalysis, and drug delivery.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Hongyuan Zhang,Jieqiong Wang,Wei Wu,Ce Han,Ming Li
A novel electrochemical sensor for detecting heavy metal ions in seafood was developed to address food safety concerns. The sensor integrates graphene oxide into NH 2 -UiO-66 loaded nanofiber carbon aerogel, enhanced its three-dimensional conductive network and effective active surface area (0.34 cm 2 ), which improved ion enrichment and oxidation-reduction reaction rates. Using the Box-Behnken design, the sensor was optimized to detect cadmium and lead with LODs of 0.16 μg·L −1 and 0.07 μg·L −1 in the 1 to 150 μg·L −1 linear range. Applied to real seafood samples, the sensor showed results consistent with ICP-OES, confirmed its reliability in complex substrates. This approach offered a promising, low-cost solution for real-time monitoring of heavy metal contamination in seafood, ensuring public food safety.
研究领域:
食品科学
·
电化学传感器
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Gaojie Zou,Xinmei Luo,Gongwen Gan,Kui Liu,Zongliang Zheng
Despite their exhibit high cut-off frequency and low sintering temperature, which make Y-type hexaferrites promising for high-frequency applications, their relatively low permeability and high loss have restricted their utility in antenna miniaturization. In this study, a series of Y-type hexaferrites Ba 2 Co 2- x Cd x Fe 12 O 22 ( x = 0.0, 0.5, 1.0, 1.5) were synthesized, and the effects of Cd 2+ substitution on the phase structure, microstructure, magnetic properties, and high-frequency magneto-dielectric response were systematically investigated. X-ray diffraction (XRD) analysis confirmed the formation of a pure Y-type phase and detected significant lattice expansion. Scanning electron microscopy (SEM) revealed a plate-like grain morphology, with enhanced densification observed at higher Cd 2+ doping levels. Vibrating sample magnetometry (VSM) measurements demonstrated that the saturation magnetization ( M s ) remained essentially stable, whereas the coercivity ( H c ) decreased progressively, leading to a reduction in the magnetocrystalline anisotropy constant ( K 1 ). Consequently, the real parts of both complex permeability ( μ′ ) and permittivity ( ε′ ) exhibited marked improvement around 0.6 GHz ( μ′ from ∼2.2 to ∼4.5, ε′ from ∼4.5 to ∼6.2). Finally, an antenna simulated using the properties of the A3 sample ( x = 1.0) achieved a compact size of 0.299 λ 0 × 0.256 λ 0 × 0.0149 λ 0 and an ultra-wide bandwidth of 42.9% (640-990 MHz) in the UHF band, demonstrating both miniaturization and excellent broadband performance.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Xihong Guo,Ying Li,Huan Huang,Dongmei Wang,Rongli Cui,Jialiang Li,Yidong Zhao,Dan Wang,Hui Yuan,Jinquan Dong,Baoyun Sun
Graphdiyne-based materials are promising candidates for the adsorption and detection of heavy metal ions (HMIs) as the acetylenic links in graphdiyne strongly interact with some metal ions. To improve the sensing performance of graphdiyne-based materials and further understand their detection mechanism, we prepared N-substituted graphdiyne (TGDY) through bottom-up method as electrode modified materials, which contained position-fixed and content-controlled alkynyl bonds and pyridine N atoms. By comparing with the H-substituted graphdiyne (HGDY), which was roughly the same in structure as TGDY except that the benzene ring without N atoms, we found that the introduction of N in TGDY greatly improves the electrochemical performance and the signal intensity is closely related to the number of detection sites. Furthermore, the performance of TGDY-based electrochemical sensor was also explored, which showed satisfactory selectivity , reproducibility, stability and applicability for the detection of Cd 2+ and Pb 2+ in water. Our work provided an important reference for rational design and synthesis of electrode materials through bottom-up method to improve the detection performance and explore the detection mechanism.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Jiajia Han,Jingguo Yu,Yufei Guo,Li Wang,Yonghai Song
The indissolubility or poor dissolubility of covalent-organic frameworks (COFs) limits their wide applications. Here, the COF BTLP-1 which were prepared by the aminaldehyde condensation between 1,4-benzenedithiol-2,5-diamino-hydrochloride and 1,3,5-triformylbenzene was controllably grown on kenaf stem-derived macroporous carbon (3D-KSC). Compared with COF BTLP-1 powder, the COF BTLP-1 grown on 3D-KSC avoided their random orientation effectively. The results showed that the amount of COF BTLP-1 could be effectively controlled by adjusting the concentration of monomers and growing time. Each unit of COF BTLP-1 has 12 adsorption sites (6 sulfur atoms and 6 nitrogen atoms) for heavy metal ions (HMIs) and regular holes to facilitate the transfer of HMIs. A large number of adsorption sites of HMIs could identify and captured HMIs selectively, and accordingly Cd 2+ , Pb 2+ , Cu 2+ and Hg 2+ could be detected simultaneously by using the COF BTLP-1 /3D-KSC electrode. The detection limits for Cd 2+ , Pb 2+ , Cu 2+ and Hg 2+ are 12.3 nM, 11.8 nM, 18.6 nM and 21.4 nM, respectively. The sensitivities are up to 1337.4 μA/μM cm 2 , 1389.0 μA/μM cm 2 and 886.2 μA/μM cm 2 , 770.0 μA/μM cm 2 , respectively. The COF BTLP-1 /3D-KSC may be also applied in other fields of electroanalytical chemistry.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 83
·79641-79650
·
IF 3.289
Ping Tan,Junjie Wen,Yongyou Hu,Xiaojun Tan
Novel poly(vinyl alcohol)/graphene oxide (PVA/GO) nanofibers were fabricated by electrospinning and applied to remove Cu2+ and Cd2+ from aqueous solution. The adsorption performances of the PVA/GO nanofibers were investigated by removing Cu2+ and Cd2+. The results showed that the adsorption of Cu2+ and Cd2+ onto PVA/GO nanofibers increased as the pH was increasing, but only slightly reduced with the increasing of ionic strength. The adsorption could reach equilibrium within 25 min and the experimental kinetic data followed the pseudo-second-order kinetic model. The equilibrium adsorption data can be well fitted with the Langmuir model. The thermodynamic parameters calculated from adsorption isotherms at four different temperatures indicated that the adsorption processes were endothermic and spontaneous. The PVA/GO nanofibers have good regeneration ability and can be recycled 8 times with a small amount of loss in adsorption efficiency. FTIR and XPS results indicated that the carboxyl and the carbonyl groups of GO on the surface of the nanofibers mainly participated in the adsorption of Cu2+ and Cd2+.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Feng Li,Wei Wang,Chengcheng Li,Runliang Zhu,Fei Ge,Yang Zheng,Yixin Tang
Biomineralization is an interesting naturally occurring process of forming minerals by microorganisms, which offers an efficient way to sequester heavy metal ions within relatively stable solid phases. In this study, Bacillus cereus Cd01 was selected to investigate effects of self-mediated pH on biosorption and biomineralization of Cd 2+ in whole 72h cultivation period. Results revealed that strain Cd01-mediated pH decrease of the cultivation medium from 7.0 to 6.1 inhibited biosorption of Cd 2+ on Cd01 cells at the initial cultivation period, while an increased pH from 6.1 to 7.4 facilitated biosorption of Cd 2+ on Cd01 cells at the middle and late cultivation period. The reasons were mainly that self-mediated pH altered cell surface hydrophobicity and cell membrane fluidity of strain Cd01. Moreover, biosorption and bioaccumulation of Cd 2+ on Cd01 cells in the period of increased pH promoted biomineralization of Cd 2+ observed by the transmission and scanning electron microscopes. The analyses of energy dispersive spectroscopy, X-ray photoelectron spectroscopy and select area electron diffraction demonstrated that Cd 2+ loaded on Cd01 cells was biomineralized into polycrystalline and/ or amorphous cadmium sulfide and cadmium phosphate. These results suggest that strain Cd01 may play a potential role in biomineralization remediation of heavy metal contaminated soils.
研究领域:
微生物学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
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
·
环境生物学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Gangfeng Li,Tarun Belwal,Zisheng Luo,Yintao Li,Li Li,Yanqun Xu,Xingyu Lin
Direct electrochemical detection in real food samples remains challenging due to the fouling and interference by abundant interference components. Herein, we report an electrochemical sensing platform based on binary assembly of silica nanochannels and polydimethylsiloxane that is able to detect Pb 2+ and Cd 2+ in real food samples without complex pretreatments. Using differential pulse anodic stripping voltammetry, the electrochemical detection consists of electro-deposition of metal species and subsequent anodic stripping in the modified silica-nanochannels. Under the optimized conditions, the linear ranges were obtained from 4 to 1500 μg L −1 for Pb 2+ and 30 to 900 μg L −1 for Cd 2+ . The relative standard deviations were 2.9% and 3.6% for Pb 2+ and Cd 2+ of 300 μg L −1 . Without tedious pretreatments, the quantitative detection of Pb 2+ and Cd 2+ in real juice and beverage samples was successfully performed, revealing that the developed sensor possesses excellent anti-interference and practicability properties for unprocessed food.
研究领域:
分析化学
·
食品科学
✓ 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）