JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Yinglei Zhao,Jinnuo Zhang,Mostafa Gouda,Chenghao Zhang,Lei Lin,Pengcheng Nie,Hongbao Ye,Wei Huang,Yunxiang Ye,Chengquan Zhou,Yong He
Plants synthesize phytochelatins to chelate in vivo toxic heavy metal ions and produce nontoxic complexes for tolerating the stress. Detection of the complexes would simplify the identification of high phytoremediation cultivars, as well as assessment of plant food for safe consumption. Thus, a confocal Raman spectroscopy combined with density functional theory and deep learning was used for characterizing phytochelatin2 (PC 2 ), and Cd-PC 2 mixtures. Results showed the PC 2 chelate Cd 2+ in a 2:1 ratio to produce Cd(PC 2 ) 2 ; Cd-S bonds of the Cd(PC 2 ) 2 have signature Raman vibrations at 305 and 610 cm −1 which are the most distinctive spectral signatures for varieties of Cd-PCs complexes. The PC 2 was used as a natural probe to stabilize the chemical status of Cd, and to enrich and magnify Raman signature of the trace Cd for deep learning models which enabled condition of the Cd(PC 2 ) 2 in pak choi leaf to be visualized, quantified, and classified by directly using raw spectra of the leaf. This study provides a general protocol by using Raman information for structure analysis and non-invasive detection of heavy metal-PCs complexes in plants and provides a novel idea for simplifying identification of high phytoremediation cultivars, as well as assessment of heavy metal related food safeties.
研究领域:
植物学
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环境科学
·
食品科学
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DOI
高影响因子
ANALYTICAL LETTERS
·
2016
·
IF 1.088
Shuangqiao Ju,Mousheng Liu,Yaling Yang
Magnetic solid-phase extraction was used for the preconcentration of cadmium, lead, and cobalt in Moringa Oleifera with determination by flame atomic absorption spectrometry. Fe3O4 nanoparticles were modified by oleic acid to form the sorbent for magnetic solid-phase extraction. The modified sorbent was characterized by transmission electron microscopy, infrared spectroscopy, and X-ray diffraction. The preconcentration was optimized for the mass of nanoparticles, pH, adsorption time, the presence of coexisting ions, solution volume, eluent, and reuse. The optimized limits of detection were 0.09, 0.26, and 0.54 µg/L for Cd(II), Pb(II), and Co(II) with relative standard deviations below 4.3%. The method was employed for the analysis of Moringa oleifera and recoveries between 90.0 and 102.0% were obtained.
研究领域:
分析化学
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环境毒理学
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植物营养学
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食品安全
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重金属检测
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DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2014
·Vol. 70
·期 12
·1913-1918
·
IF 1.212
Meng Lifen,Ning Jinyan,Yang Yaling
A sensitive and simple method for flame atomic absorption spectrometry determination of traces of cadmium and chromium(III) species in water samples after preconcentration by cloud point extraction has been developed. A novel complex agent of alizarin complexone with cadmium (Cd) and chromium (Cr(III)) was quantitatively extracted in surface primary alcohol ethoxylate-rich phase at 33 °C. The effects of experimental conditions including pH of sample solution, concentration of chelating agent and salt, equilibration temperature and time, and foreign ions were evaluated in order to enhance sensitivity of the method. Under optimal conditions, the low limit detections were 6.7 and 3.2 μg/L, and the enrichment factors were 24 and 20 for Cd and Cr(III), respectively. The relative standard deviations were 3.8 and 2.5% for Cd and Cr(II), respectively ( n = 11). The high recoveries of the spiked Cd and Cr(III) ions were obtained in the range of 90–116%. The proposed method has been successfully applied for the determination of Cd and Cr(III) in water samples.
研究领域:
分析化学
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环境监测
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重金属检测
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水环境科学
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痕量元素分析
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2017
·Vol. 164
·期 13
·H967
·
IF 3.259
Sanshuang Gao,Chuyang Xu,Nuerbiya Yalikun,Xamxikamar Mamat,Yongtao Li,Thomas Wågberg,Xun Hu,Jing Liu,Jun Luo,Guangzhi Hu
Carbon matrix materials are regarded as one of the most important electrode materials for heavy metal detection. But even so, optimization procedures of carbon nanofibers (CNFs) for tracing Cd(II) and Pb(II) remains challenging. Here, zeolitic imidazolate framework (ZIF-8)/polyacrylonitrile (PAN)-derived nitrogen-doped porous carbon nanofibers (N-PCNFs) were investigated as a new electrode material for determining the concentration of Cd(II) and Pb(II). By optimizing electrochemical conditions such as deposition potential, deposition time, pH of buffer solution, and quantity of N-PCNFs loaded on a glassy carbon electrode (GCE), the linear response curves of Cd(II) and Pb(II) could be obtained. Due to the unique structural feature and N content, the N-PCNFs possess excellent detection limits of 0.8 μg L−1 for Cd(II) and 0.3 μg L−1 for Pb(II) (S/N = 3). To manifest the practical use of the sensor platform the concentration of Cd(II) and Pb(II) in normal tap and waste water were monitored. According to the ICP-MS results, the calculated recovery (97.0–107%) indicates that N-PCNFs have potential as a candidate material to monitor the concentration of Cd(II) and Pb(II) in practical samples.
研究领域:
环境科学
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材料科学
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分析化学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Zhou Liuzhu,Sankar Sekar,Jin Chen,Sejoon Lee,Deuk Young Kim,Ramalingam Manikandan
Here, we report a simple one-step preparation of polyrutin/silver nanoparticles (AgNPs) on the glassy carbon electrode (GCE) surface using an electrochemical deposition/polymerization technique. As prepared polyrutin/AgNPs/GCE has been characterized by different techniques such as SEM with elemental morphing, TEM with EDAX , XRD , ATR-IR to confirm the materials formation. Further, electrochemical behavior of the polyrutin/AgNPs/GCE was tested by cyclic voltammetry , EIS and differential pulse voltammetric techniques. As fabricated polyrutin/AgNPs/GCE was used for simultaneous detection of Pb(II) and Cd(II)ions using anodic stripping voltammetric techniques and stripping analysis of Pb(II) and Cd(II)ions analytical parameters like pH, preconcentration time were studied. The polyrutin/AgNPs/GCE has showed a linear concentration range from 29 nM to 140 nM and 57–203 nM with detection limit of 3 nM and 10 nM for Pb(II) Cd(II)ions respectively. Further, the modified electrode was tested towards detection of these heavy metal ions in different environmental samples and the found excellent recovery results were further correlated with ICP-MS results.
研究领域:
环境科学
·
分析化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hao Zhou,Yan Dang,Chao Li,Xinyu Chen,Yongqi Liu,Haohao Bian,Andrei Ivanets,Jiliang Zheng,Xiaoyan He,José María García-Mina,Xintai Su
Unlike traditional biomass composting humification, pyrolysis humification can rapidly convert waste biomass into humic substances (HSs) at lower temperatures and in an alkaline environment for soil remediation. This study utilized the strong alkaline solid waste carbide slag (CARBIDE) and cotton stalk (CS) for pyrolysis humification. The pyrolysis humification mechanism and effect of CARBIDE and CS were investigated using FT-IR, NMR, and Py-GC/MS. Furthermore, the ability of HSs to remediate cadmium-contaminated soil (Cd-soil) was assessed through soil property analysis, pot tests, and microbial diversity studies. The results showed that humic acid (HA) and fulvic acid (FA) had the highest yield of 19 % and 5 %, respectively, among the humic substances (HS-CS&CA) produced under the conditions of 250 ℃, reaction time of 2 h and mass ratio of CS to CARBIDE of 5: 1. At 250 ℃, CARBIDE changed the heat transfer mechanism of biomass, promoted the decomposition of more hemicellulose and protein, promoted the Deamination, Ketonization and Maillard reaction, and synthesized more HAs. HS-CS&CA had a significant remediation effect on Cd-soil. The immobilization rate of Cd was as high as 23 %, and the accumulation of Cd in maize was reduced by 65 %. At the same time, the relative abundance of beneficial bacteria such as Xanthomonadaceae and Bacillaceae for immobilizing Cd was increased, and the cycling effect of N and P was also enhanced. This study provides an innovative technical route for the rapid humification of CARBIDE and CS and its application in Cd-soil remediation.
研究领域:
环境科学
·
土壤学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Jingling Huang,Weizhao Yin,Ping Li,Huaitian Bu,Sihao Lv,Zhanqiang Fang,Mingjia Yan,Jinhua Wu
In this study, nitrate mediated biotic zero-valent iron (Fe 0 ) corrosion was employed to enhance cadmium (Cd) removal from groundwater . In comparison with a 17.5% Cd(II) removal treated with abiotic Fe 0 , a 3.9 times higher Cd(II) removal of 86.2% was recorded in the nitrate-mediated biotic Fe 0 system. Solids phase characterization confirmed that biogenic minerals such as green rust and iron sulfide could be formed in the nitrate-amended biotic Fe 0 system, offering large amount of adsorption sites for Cd(II) removal. The decrease of nitrate concentration and the competition with cathodic hydrogen for biological nitrate reduction by extra organic substance such as sodium acetate both showed significant inhibition on Cd(II) removal, further proving that hydrogenotrophic denitrification was the main mechanism for enhanced Cd(II) removal. Besides, a relatively high Cd(II) removal efficiency was observed over a pH range of 5–8, and it increased with declining pH values. These results demonstrated that the bio-amended iron corrosion technology coupled Fe 0 -assisted H 2 production with hydrogenotrophic denitrification exhibited excellent Cd(II) removal capacity, which enabled this technology a promising potential for Cd(II)-contaminated groundwater treatment and an alternative strategy for Cd(II) and nitrate co-contaminated groundwater remediation .
研究领域:
环境科学
·
环境工程
·
微生物学
·
水污染治理
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生物地球化学
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DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Guoqiang Wang,Wenting Bo,Keji Wan,Jinjin Fan,Zhenyong Miao,Shuwen Xue
Heavy metals pose a serious threat and damage to ecological health when released into the environment. n-HFP is usually used to remediate soils contaminated with heavy metals, but its ability to solidify heavy metals is limited. FA has good ability to trap heavy metals due to its abundant oxygen-containing functional groups. However, the solubility of FA in water limits its application in the field of heavy metal removal. In this paper, n-HFP@FA was prepared by co-precipitation method. Through FT-IR and BET analysis, the oxygen-containing functional groups and specific surface area of n-HFP@FA increased due to the addition of FA. The adsorption behaviour of n-HFP@FA on Pb, Cd, and Cu followed the pseudo-second-order and Langmuir isotherm models. In addition, the maximum adsorption capacities of n-HFP@FA for Pb, Cd, and Cu were 371.1, 190.5, and 129.75 mg/g, respectively. As shown by FT-IR and XPS analysis, the main mechanisms of Pb, Cd and Cu removal by n-HFP@FA are: complexation, electrostatic and precipitation. The n-HFP@FA showed high removal rates of Pb, Cd, and Cu in soil leachates of different pH. In the soil remediation experiments, the BCR method and Pearson correlation analysis showed that the acid-soluble, reducible and oxidizable fractions of Pb, Cd, and Cu in the soil were effectively converted into a more stable residual fraction. This study opens up a prospect for the application of n-HFP@FA composites in the remediation of contaminated soil.
研究领域:
环境科学
·
土壤修复
·
环境污染治理
·
环境化学
·
生态毒理学
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DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 23
·期 2
·482-491
·
IF 3.117
Lin-Hui Wu,Shu-Li Yao,Jing Li,Hui Xu,Teng-Fei Zheng,Sui-Jun Liu,Jing-Lin Chen,He-Rui Wen
A novel luminescent CdII-based metal–organic framework {[Cd(BBIP)(TBIP)]·EtOH}n (1) derived from the multidentate 5-tert-butylisophthalic acid (H2TBIP) and the semi-rigid N-donor 3,5-bis(benzimidazol-1-yl)pyridine (BBIP) has been solvothermally synthesized and structurally characterized by using infrared spectroscopy, thermal analysis, single-crystal X-ray diffraction and powder X-ray diffraction. The adjacent CdII ions are linked by two carboxylate groups of one TBIP2− ligand with chelating mode to form a one-dimensional CdII-TBIP2− chain, which is further connected by the BBIP ligand to obtain a two-dimensional network. Interestingly, the fluorescence experiments indicate that 1 could be considered as a good multi-responsive sensing material for detecting Fe3+, MnO4−, Cr2O72−, salicylaldehyde (SA) and ethylenediamine (EDA) via the turn-off effect, with the detection limits of 0.53, 0.98, 3.6, 0.42 and 5.3 ppm, respectively. The luminescence quenching effect induced by Fe3+ could be mainly ascribed to the competitive absorption mechanism. The electron-transfer transition and competitive absorption mechanism could be used to explain the luminescence quenching of MnO4− and Cr2O72−. The turn-off effect of 1 on SA could be ascribed to the photoinduced electron-transfer and competitive absorption mechanisms. Meanwhile, the possible mechanism of fluorescence quenching caused by EDA could be attributed to the structure collapse. More importantly, 1 could be regenerated and reused after five cycles for Fe3+, MnO4−, Cr2O72− and SA detection. In a nutshell, 1 could be employed as a multi-responsive luminescent sensor used for the highly selective and sensitive detection of metal ions, anions and small organic molecules.
研究领域:
材料科学
·
分析化学
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Xulin Wang,Xiuzhen Zheng,Huijuan Han,You Fan,Sujuan Zhang,Sugang Meng,Shifu Chen
Glucose, as one of the most familiar biomass, can be utilized to produce hydrogen and fine chemicals. This work reports the renewable hydrogen production from glucose over Au/CdS-nanorods (Au/CdS-NRs) photocatalyst . For Au/CdS-NRs catalyst, it shows a superior H 2 evolution rate of 90.0 μmol g −1 h −1 under visible light irradiation. Moreover, the H 2 generation from the glucose solution on Au/CdS-NRs prepared by twice solvothermal method is much higher than Au colloid and photoreduction methods. Prepared with twice solvothermal method, Au nanoparticles are obtained from Au 3+ ions on the CdS surface, as Au 3+ can be reduced by photogenerated electrons. The separated hole can oxidize glucose to produce protons, and protons can be reduced by photogenerated electrons into H 2 . Meanwhile, the Au/CdS-NRs can also be used to produce H 2 from other biomasses, for instance sucrose, soluble starch, celluflor, pectin and waste paper scraps. The probable mechanism is proposed and discussed in the photocatalytic process from glucose reforming. This work indicates that the process of self-reducing Au 3+ to Au can drastically increase the photocatalytic efficiency of H 2 evolution from biomass, by promoting the separation and transportation of photogenerated charge carriers.
研究领域:
光催化
·
能源化学
·
纳米材料科学
·
可再生能源
·
环境催化
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Dongsheng Dai,Lu Wang,Nan Xiao,Songsong Li,Hao Xu,Shuang Liu,Boran Xu,Da Lv,Yangqing Gao,Weiyu Song,Lei Ge,Jian Liu
Efficient noble-metal-free semiconductor composite photocatalysts are highly desirable for visible light driven water splitting. In this study, Ni 2 P was successfully decorated on Zn 0.5 Cd 0.5 S as a highly efficient co-catalyst via a hydrothermal method . The chemical as well as photophysical properties of the as-obtained Ni 2 P/Zn 0.5 Cd 0.5 S samples were characterized by X-ray diffractometry (XRD), Transmission electron microscope (TEM), UV–vis diffusion reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) and time-resolved fluorescence. The Ni 2 P/ Zn 0.5 Cd 0.5 S composite sample with 4% molar content of Ni 2 P showed the highest photocatalytic H 2 evolution activity with a corresponding H 2 evolution rate of 1173 μmol h −1 , which was about 13 times higher than that of pure Zn 0.5 Cd 0.5 S sample under visible light irradiation. The photocatalytic activity of the Ni 2 P/Zn 0.5 Cd 0.5 S composite sample was stable even after 4 cycling photocatalytic experiments. A possible mechanism on the photocatalytic enhancement of the Ni 2 P/Zn 0.5 Cd 0.5 S composite sample was systematically investigated, which can provide a novel concept for the synthesis of other desirable semiconductor materials with high photocatalytic performance.
研究领域:
材料科学
·
光催化
·
能源化学
·
半导体催化
·
清洁能源
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DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 1
·1-20
·
IF 3.8
Liu Bangwei,Zhou Yan,Zhang Yiwei,Chen Dandan,Liu Wenhui,Lu Ping,Su Xiaoyu,Xia Tian
A zero-valent iron-loaded corn straw char (ZVI-CSC) was synthesized in this study for the remediation of As(V) and Cd(II) contamination. The impact of ZVI-CSC on the adsorption performance of As(V) and Cd(II) in solution, as well as their migration properties in soil, was investigated through adsorption kinetics and soil column leaching experiments, respectively. The results showed that the adsorption capacity of As(V) by ZVI-CSC was significantly improved to 14.42 g·kg −1 at pH = 3, compared with unmodified corn straw char (CSC). However, the adsorption capacity of Cd(II) was not improved. In the leaching experiments, the addition of ZVI-CSC to As(V)-contaminated soil resulted in a significant reduction of cumulative As(V) release rate from 32.26 to 3.11%, compared with corn straw char (CSC). Moreover, the role of ZVI in As(V)/Cd(II) remediation was analyzed. nZVI forms ≡Fe-OH and ≡Fe-OOH due to oxidation, which can form monodentate and bidentate complexes with As(V) via ligand exchange, thus promoting As immobilization. Furthermore, to further improve the adsorption performance of Cd(II), the electrostatic potential (ESP) of biochars with different surface functional groups (C = O, C–O–C, –OH, and –COOH) and their bond dissociation enthalpy (BDE) with As(V) and Cd(II) were calculated based on density functional theory (DFT). The results showed that –OH was the most effective for As(V) adsorption, and C–O–C was the most effective for Cd(II) adsorption. C = O and –COOH can be used to the simultaneous adsorption of As(V) and Cd(II). Therefore, the surface functional groups of ZVI-CSC can be selectively modified to improve its adsorption performance of As(V) and Cd(II). Graphical
研究领域:
环境科学
·
材料科学
·
化学工程
·
土壤修复
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DOI
高影响因子
危险品化学品经营许可证（带存储）