International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 20
·13415
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IF 4.614
Tingting Zhang,Mei Shi,Hao Yan,Cheng Li
Heavy metal pollution and water eutrophication are still the main issues to be solved in the environmental field. To find a biological control method for Cd2+-contaminated water or combined eutrophication and Cd2+pollution water, the effects of salicylic acid on heavy metal Cd2+resistance in eukaryotic algaeScenedesmus obliquusandChlorella pyrenoidosaand its mechanisms were studied. The results showed that the inhibition rates of 3.0 mg/L Cd2+stress group at 96 h were 67.0% onS. obliquusand 61.4% onC. pyrenoidosaand their uptake of Cd2+was 0.31 mg/g and 0.35 mg/g, respectively. When adding the different concentrations of salicylic acid while stressed by 3.0 mg/L Cd2+, the hormesis phenomenon of low dose stimulation and high dose inhibition could be seen, and the inhibition rates of 30 mg/L~90 mg/L salicylic acid addition groups were significantly lower than those of the Cd2+stress group alone, which were statistically significant (p< 0.05) and the absorption of Cd2+was dramatically improved. Except for the 120 mg/L salicylic acid addition group, the chlorophyll fluorescence parameters (Fv/Fm and YII), glutathione peroxidase (GSH-Px) and glutathione-S-transferase (GST) activities of all the other concentration groups were significantly higher than those of the Cd2+stress group alone,p< 0.05.; the algal cell morphology in low concentration groups (30 mg/L and 60 mg/L) was also less damaged than those in the Cd2+stress group alone. These indicate that the low concentrations of salicylic acid can counteract or protect the algal cells from Cd2+attack, the mechanisms, on the one hand, might be related to the chelation of heavy metals by salicylic acid, resulting in the decrease of the toxicity of Cd2+; on the other hand, low concentrations of salicylic acid can stimulate the growth of these two algae, improve their photosynthetic efficiency and antioxidant capacity, as well as maintain the relative integrity of algal morphological structure.Keywords:Cd2+pollution;eutrophication;salicylic acid;S. obliquus;C. pyrenoidosa
研究领域:
环境科学
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植物学
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生态毒理学
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DOI
PubMed
高影响因子
ACS Nano
·
2024
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IF 15.8
Tao Sun,Huaishu Huo,Yingying Zhang,Yaru Xie,Yize Li,Kungang Pan,Fenfang Zhang,Jing Liu,Yindong Tong,Weiwen Zhang,Lei Chen
The pollution caused by heavy metals (HMs) represents a global concern due to their serious environmental threat. Photosynthetic cyanobacteria have a natural niche and the ability to remediate HMs such as cadmium. However, their practical application is hindered by a low tolerance to HMs and issues related to recycling. In response to these challenges, this study focuses on the development and evaluation of engineered cyanobacteria-based living materials for HMs bioremediation. Genes encoding phytochelatins (PCSs) and metallothioneins (MTs) were introduced into the model cyanobacterium Synechocystis sp. PCC 6803, creating PM/6803. The strain exhibited improved tolerance to multiple HMs and effectively removed a combination of Cd2+, Zn2+, and Cu2+. Using Cd2+ as a representative, PM/6803 achieved a bioremediation rate of approximately 21 μg of Cd2+/OD750 under the given test conditions. To facilitate its controllable application, PM/6803 was encapsulated using sodium alginate-based hydrogels (PM/6803@SA) to create “living materials” with different shapes. This system was feasible, biocompatible, and effective for removing Cd2+ under simulated conditions of zebrafish and mice models. Briefly, in vitro application of PM/6803@SA efficiently rescued zebrafish from polluted water containing Cd2+, while in vivo use of PM/6803@SA significantly decreased the Cd2+ content in mice bodies and restored their active behavior. The study offers feasible strategies for HMs bioremediation using the interesting biomaterials of engineered cyanobacteria both in vitro and in vivo.
研究领域:
环境科学
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微生物学
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生物技术
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材料科学
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产品关联
DOI
PubMed
高影响因子
Arabian Journal of Chemistry
·
2022
·
IF 6.212
Jingbo Wang,Yaxin Kang,Huatai Duan,Yi Zhou,Hao Li,Shanguo Chen,Fenghua Tian,Lianqing Li,Marios Drosos,Changxun Dong,Stephen Joseph,Genxing Pan
Co-pyrolysis of straw and Ca(OH) 2 is a feasible modification method to improve the adsorption capacity of biochar for Cd. However, few studies have quantitatively analyzed the contribution of different adsorption mechanisms of alkali-modified biochar. In this study, the alkali-modified (Ca) biochar were prepared by co-pyrolyzing lime (Ca(OH) 2 ) and soybean straw (SBB) or rape straw (RSB) at 450 °C. The adsorption mechanism was investigated by a series of experiments and was provided by quantitative analysis. The maximum adsorption capacities of Cd 2+ by Ca-SBB and Ca-RSB were calculated to be 78.49 mg g −1 and 49.96 mg g −1 , which were 1.56 and 1.48 times higher than SBB (50.40 mg g −1 ) and RSB (33.79 mg g −1 ), respectively. Compared with the original biochar (SBB, RSB), alkali-modified biochar (Ca-SBB and Ca-RSB) were found to have faster adsorption kinetics and lower desorption efficiencies. The mechanism study indicated that Ca(OH) 2 modification effectively enhanced the contribution of ion exchange and decreased the contribution of functional groups complexation. After Ca(OH) 2 modification, precipitation and ion exchange mechanisms dominated Cd 2 + absorption on Ca-SBB, accounting for 49.85% and 34.94% of the total adsorption, respectively. Similarily ion exchange and precipitation were the main adsorption mechanism on Ca-RSB, accounting however for 61.91% and 18.47% of total adsorption, respectively. These results suggested that alkali-modified biochar has great potential to adsorp cadmium in wastewater.
研究领域:
环境科学
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土壤修复
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DOI
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
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DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 15
·e202305174
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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
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环境科学
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分析化学
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
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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
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电化学传感器
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2026
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IF 6.7
Can Cui,Longhao Zeng,Xia Liu,Huihui Li,Bo Jiang,Da Guo,Huanjiang Wang,Yadian Xie
To address cadmium pollution in water bodies, a novel N-doped red mud-biochar magnetic composite (N-RCB) was prepared through one-step co-pyrolysis of corn stover and red mud at 800 °C, using ammonium chloride as a pore-forming agent and urea as a nitrogen source. The obtained N-RCB was applied for the efficient removal of Cd 2+ from aqueous solutions. The equilibrium adsorption capacity of N-RCB for Cd 2+ was 5.0 times and 4.2 times that of the pristine biochar (CB) and non-N-doped magnetic red mud-biochar (RCB), respectively. The maximum theoretical adsorption capacity of N-RCB for Cd 2+ could reach 473.25 mg·g –1 . Adsorption kinetics and isotherm studies indicated that the adsorption process of Cd 2+ onto N-RCB followed the pseudo-second-order kinetic model and the Freundlich isotherm model, suggesting that the process is dominated by chemisorption and heterogeneous multilayer adsorption. The thermodynamic parameters demonstrated that the adsorption process was spontaneous, endothermic, and driven by an increase in entropy. The adsorption mechanisms of Cd 2+ by N-RCB included pore filling, cation-π interactions, surface complexation, and electrostatic attraction. Coexisting ion experiments further demonstrated that N‑RCB exhibited good anti‑interference ability toward common ions such as K + , Na + , Mg 2+ , NO₃⁻, and Cl⁻. In addition, after five consecutive adsorption–desorption cycles, the removal efficiency of Cd 2+ by N-RCB remained above 88 %. These results indicate that N-RCB is a promising green and efficient material for the removal of Cd 2+ from water bodies, demonstrating significant application potential.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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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.
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产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
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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.
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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.
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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
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材料工程
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化学工程
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水处理技术
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吸附科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Bioresource Technology Reports
·
2022
·
IF 0
Sen Lin,Yihong Guo,Lei Zhou,Hongjun Yang
Quantitative effects of surface oxidation on Cd 2+ adsorption performance of biochar derived from long-root Eichhornia Crassipes plants were systematically investigated. It was revealed that oxidation degree was positively related with the intensity of surface functional groups and harmless for the structural stability, while biochar yield would decline sharply resulting from for over-oxidization. Correspondingly, the Cd 2+ adsorption capacity exhibited an uptrend with the increasing oxidation on account of the abundant adsorption sites. Moreover, Cd 2+ adsorption on the biochar with different oxidation degrees were also investigated comprehensively, indicating adsorption performances in a similar trend highly sensitive to solution pH and ionic strength . In addition, the adsorption isotherms were found to manifest the saturated adsorption capacity for Cd 2+ increased from 0.333 mol/g to 0.487 mmol/g at 30 °C by strengthening oxidation. All synthesized biochar could keep consistent adsorption performance in multiple adsorption-desorption cycles.
研究领域:
环境科学
·
材料科学
·
生态学
✓ 已验证
DOI
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