CELLULOSE
·
2013
·Vol. 20
·期 2
·849-860
·
IF 3.476
Duan Chunting,Zhao Ning,Yu Xiaolan,Zhang Xiaoyan,Xu Jian
Kapok fiber, a natural hollow fiber with thin shell and large cavity, has rarely been used as adsorbent for heavy metal ions. In this paper, kapok fibers were modified with diethylenetriamine pentaacetic acid (DTPA) after hydrophilicity treatment. The adsorption behavior of the resultant kapok-DTPA influenced by pH, adsorption time and initial concentration of metal ion was investigated. The results demonstrate that adsorption equilibrium was reached within 2 min for Pb 2+ and Cd 2+ . Adsorption kinetics showed that the adsorption rate was well fitted by pseudo-second-order rate model. The adsorption isotherms were studied, and the best fit was obtained in the Langmuir model. The maximum adsorption capacities of kapok-DTPA were 310.6 mg g −1 for Pb 2+ , 163.7 mg g −1 for Cd 2+ , 101.0 mg g −1 for Cu 2+ , respectively. After eight desorption and re-adsorption loops, the lost adsorption capacities for Pb 2+ and Cu 2+ were less than 10 %. Because of the large specific area derived from the hollow fiber structure, kapok-DTPA exhibited much better adsorption capacity compared with many other reported adsorbents based on natural materials.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Suzhen Huang,Zhikai Wang,Qixuan Song,Jun Hong,Tianyu Jin,Haiqing Huang,Zheng Zheng
Humic substances are widely present in aquatic environments. Due to the high affinity of humic substances for metals, the interactions have been particularly studied. To assess the effect of humic acid (HA) on submerged macrophytes and biofilms exposed to heavy metal stress, Vallisneria natans was exposed to solutions containing different concentrations of HA (0.5–2.0 mg·L −1 ), Pb 2+ (1 mg·L −1 ) and Cd 2+ (1 mg·L −1 ). Results suggested that HA positively affected the plant growth and alleviated toxicity by complexing with metals. HA increased the accumulation of metals in plant tissues and effectively induced antioxidant responses and protein synthesis. It was also noted that the exposure of HA and metals promoted the abundance and altered the structure of microbial communities in biofilms. Moreover, the positive effects of HA were considered to be related to the expression of related genes resulting from altered DNA methylation levels, which were mainly reflected in the altered type of demethylation. These results demonstrate that HA has a protective effect against heavy metal stress in Vallisneria natans by inducing effective defense mechanisms, altering biofilms and DNA methylation patterns in aquatic ecosystems.
研究领域:
环境科学
·
植物学
·
微生物学
·
遗传学
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DOI
PubMed
高影响因子
Chemosensors
·
2023
·Vol. 11
·期 1
·54
·
IF 4.2
Ruiqin Gu,Yunong Zhao,Huibing Fu,Qing Huang,Long Li,Zhixiang Hu,Licheng Zhou,Bingbing Chen,Huan Liu
The detection of heavy metal ions is becoming increasingly important for environmental monitoring and personal safety protection. Owing to their large surface area and suitable conductivity, metal oxide semiconductor nanocrystals have been utilized in chemically modified electrodes for the rapid and low-cost detection of heavy metal ions. However, their sensitivity and selectivity for cadmium ion (Cd2+) detection still remains a challenge. Here, a method of ultra-sensitive and selective Cd2+detection based on WO3-nanocrystal-modified electrodes is proposed and demonstrated. Colloidal WO3nanocrystals were synthesized via a solvothermal route and then deposited onto a carbon electrode using a spin-coating method, forming the modification layer at room temperature. The WO3-nanocrystal-modified electrodes exhibit a remarkable signal transduction capability that converts Cd2+adsorption into current output signals. The peak current was linear to the logarithm of the Cd2+concentration from 1 nM to 10,000 nM when measured using the anodic stripping voltammetry method. The selectivity mechanism was studied and attributed to the high adsorption energy of cadmium on WO3compared to other heavy metal ions. Employment of WO3for a high-performance Cd2+-selective electrode opens many opportunities in portable ion-detection applications.
研究领域:
环境科学
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材料科学
·
分析化学
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DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Xuankun Wei,Yongqi Sun,Yiping Su,Xuehua Shen,Yuanyuan Tang,Feng Yan,Zuotai Zhang
Geopolymers have emerged as a promising solution for solidifying heavy metals; however, the underlying mechanisms remain elusive. In this study, we synthesized geopolymers incorporating Pb2+ and Cd2+ to unravel their solidification mechanisms. Leaching analyses demonstrated superior solidification efficacy for Pb2+ (93.6%) compared to that for Cd2+ (65.2%). The dissimilarity in solidification mechanisms can be attributed to variances in ionic potential and covalent interactions between the cations. Furthermore, Cd2+ exhibited a higher ionic potential, facilitating its exchange with Na+ in the geopolymer matrix. Triple-quantum nuclear magnetic resonance experiments revealed a weak affinity of the geopolymer structure toward Cd2+. Density functional theory calculations affirmed stronger interactions between Pb2+ (−8.71 eV) and the matrix compared to those of Cd2+ (−5.83 eV). Consequently, Pb2+ demonstrated an enhanced covalent propensity within the geopolymer matrix, while Cd2+ primarily underwent solidification via ion exchange. This research provides novel insights and concepts regarding the mechanisms involved in solidifying heavy metals in geopolymers.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2015
·
IF 4.529
Ping Tan,Jian Sun,Yongyou Hu,Zheng Fang,Qi Bi,Yuancai Chen,Jianhua Cheng
Novel, highly ordered layered graphene oxide (GO) membranes with larger interlayer spacing were prepared by induced directional flow and were used as adsorbents for the removal of Cu 2+ , Cd 2+ and Ni 2+ from aqueous solutions. The effects of pH, ionic strength, contact time, metal ion concentration and cycle time on Cu 2+ , Cd 2+ and Ni 2+ sorption were investigated. The results indicated that the adsorption of Cu 2+ , Cd 2+ and Ni 2+ onto GO membranes was greatly influenced by the pH and weakly affected by the ionic strength. The adsorption isotherms for Cu 2+ , Cd 2+ and Ni 2+ were well fitted by the Langmuir model. The maximum adsorption capacities of the GO membranes for Cu 2+ , Cd 2+ and Ni 2+ were approximately 72.6, 83.8 and 62.3 mg/g, respectively. The adsorption kinetics of Cu 2+ , Cd 2+ and Ni 2+ onto GO membranes followed the pseudo-second-order model. The adsorption equilibrium was reached in a shorter time. The GO membranes can be regenerated more than six times based on their adsorption/desorption cycles, with a slight loss in the adsorption capacity. The results demonstrated that the GO membranes can be used as effective adsorbents for heavy metal removal from water.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Jinting Zhu,Linhan Fan,Wenqing Li,Xinru Qi,Changyan Sun,Wenjun Li,Zhidong Chang
The accumulation of heavy metal ions in nature will not only lead to the further deterioration of the environment, but also directly do harm to human health. And as a gas pollutant, excessive inhalation of formaldehyde is also harmful to human health. Herein, a novel Eu-MOF was synthesized by solvothermal method using Eu 3+ , 2-pyridine-4-yl-3H-benzimidazole-5-carboxylic acid (HL) and 1,10-phenanthroline (phen), which can be used as a ratio fluorescent probe to detect Hg 2+ , Cd 2+ and formaldehyde, and the limits of detection(LOD) can reach 34, 9.91 and 194 nM respectively. Among them, the LOD of Eu-MOF for Cd 2+ has reached the lowest level at present. Noticeable, Eu-MOF can detect formaldehyde in both liquid and gas phases, and the response time is extremely short. In addition, Eu-MOF has been applied to trace detection of Hg 2+ and Cd 2+ in tap water, lake water and sea water with satisfactory recoveries (ranging from 98.10 % to 103.0 %). A program has been developed for quickly calculating the concentration of the substances to be detected by capturing the fluorescent color of the solvents under the ultraviolet light.
研究领域:
环境科学
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分析化学
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材料科学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2016
·
IF 2.76
Ping Tan,Yongyou Hu,Qi Bi
A novel graphene oxide membrane (GOM) was prepared using the vacuum filtration-induced directional flow method. The properties of GOM were characterized by scanning electron microscope, X-ray diffraction instrument, transmission electron microscope, and Fourier transform infrared spectroscopy apparatus. The adsorptive properties of Cu 2+ , Cd 2+ and Ni 2+ onto GOM were systematically investigated in single, binary and ternary solutions by batch experiments. In a single system, the maximum adsorption capacities of Cu 2+ , Cd 2+ and Ni 2+ obtained by the Langmuir model were 1.21, 0.81 and 1.08 mmol/g, respectively. The isotherms results for Cu 2+ indicated that GOM exhibited good selectivity in the adsorption of Cu 2+ over Cd 2+ and Ni 2+ . The adsorption capacity followed the order of Cu 2+ > Ni 2+ > Cd 2+ in binary systems. For ternary system, the order of the adsorption capacity was Cu 2+ > Cd 2+ > Ni 2+ . Previously adsorbed metal ions on GOM could be displaced by subsequently adsorbed metal ions from the solution. The difference in hard and soft acids and bases of Cu 2+ , Cd 2+ and Ni 2+ solutions was identified as the main reason for GOM to be able to selectively adsorb favorable metal ions during competitive adsorption in binary systems. This interaction mechanism between the favorable component and other metal ions could be the primary cause of direct displacement.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2019
·
IF 3.839
Yuan Liu,Taotao Li,Chuxuan Ling,Zhu Chen,Yan Deng,Nongyue He
An electrochemical sensor based on self-made nano-porous pseudo carbon paste electrode (nano-PPCPE) has been successfully developed, and used to detect Cd 2+ and Pb 2+ . The experimental results showed that the electrochemical performance of nanoPPCPE is evidently better than both glassy carbon electrode (GCE) and pure carbon paste electrode (CPE). Then the prepared nano-PPCPE was applied to detect Cd 2+ and Pb 2+ in standard solution, the results showed that the electrodes can quantitatively detect trace Cd 2+ and Pb 2+ , which has great significance in electrochemical analysis and detection. The linear ranges between the target ions concentration and the DPASV current were from 0.1–3.0 μmol/L, 0.05–4.0 μmol/L for Cd 2+ and Pb 2+ , respectively. And the detection limits were 0.0780 μmol/L and 0.0292 μmol/L, respectively. Moreover, the preparation of the nano-PPCPE is cheap, simple and has important practical value.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Jian Hua Wang,Yao Ming Liu,Jian Bin Chao,Hui Wang,Yu Wang,ShaoMin Shuang
A very simple schiff base fluorescent probe (NIS) was facilely prepared via a one-step, one-pot condensation reaction between 2, 3-naphthalenediamine and imidazole-2-carboxaldehyde. Among common biologically relevant metal ions, NIS can selectively recognize Cd 2+ via ratiometric fluorescence signal. The chelation of NIS with the Cd 2+ ions resulted in a fluorescence enhancement together with a blue shift (˜74 nm) in the emission maxima, presumably due to the combined effects of ICT (internal charge transfer) and CHEF (chelation-enhanced fluorescence). The binding stoichiometry of NIS to Cd 2+ is 1:1 and the fluorescence intensity ratio (F 398 /F 472 ) changes allow a ratiometric detection of Cd 2+ with the detection limit of 3.87 × 10 −7 M. Under fluorescence confocal microscope and via two emission channels, the probe is capable to detect Cd 2+ ions in Human liver cancer cells (SMMC-7721), zebrafish and live tissues of Arabidopsis thaliana, demonstrating its applicability for detecting Cd 2+ ions in different biological context with low toxicity.
研究领域:
分析化学
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生物医学
·
环境科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 29
·44794-44805
·
IF 5.19
Wu Mingda,Lu Linghong,Zhou Tao,Ma Yi,Weng Zhengsong
Calcium and magnesium ions usually exist in natural water. When Cd 2+ is removed from water by adsorption, it will be inhibited by these two ions. Titanate nanotubes (TNTs) have an effective adsorption capacity for Cd 2+ due to extraordinary ion exchange property. However, TNTs also adsorb Ca 2+ and Mg 2+ in water. In this study, carbon-modified TNT (TNT/C) and TNT/C further treated with acid (TNT/HC) were synthesized by hydrothermal synthesis. The transmission electron microscope (TEM) images show that TNT/C or TNT/HC still keep nanotube morphology. The experimental results show the order of adsorption amount to Cd 2+ is TNT (171.56 mg/g) > TNT/C (166 mg/g) > TNT/HC (159.88 mg/g) when there is no Ca 2+ or Mg 2+ . But when there is 0.1 M Ca 2+ or Mg 2+ in the water, the order of Cd 2+ adsorption capacity becomes TNT/HC (44.28, 49.04 mg/g) > TNT/C (58.84, 69.32 mg/g) > TNT (65.52, 70.6 mg/g). It indicates that the surface carbon modification can alleviate the hindrance of Ca 2+ or Mg 2+ to Cd 2+ removal. This is because the carbon on the surface of TNT captured part of Ca 2+ or Mg 2+ ; it made more Cd 2+ be successfully absorbed by TNT through ion exchange. This mechanism was confirmed by the X-ray photoelectron spectroscopy (XPS) spectra analysis. The results of this paper can provide ideas for the adsorption and removal of Cd 2+ in water in the presence of Ca 2+ or Mg 2+ .
研究领域:
环境科学
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材料科学
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PubMed
高影响因子
TALANTA
·
2025
·
IF 6.1
Shan Wang,Wei-Jing Chen,Li Hua,Zhaoqing Lu
Accurate and rapid on-site detection of cadmium (Ⅱ) ions (Cd 2+ ) in environment is crucial for protecting ecological environment and human health. This study developed an electrochemical sensor for Cd 2+ detection, based on a laser-induced aramid nanofiber (ANF) film for the in-situ generation of three-dimensional porous graphene. This ANF-based graphene, obtained through precise control of two-step laser process using 450 nm laser, exhibits enhanced graphitization, a denser structure, and superior electrochemical properties. On the basic of laser-induced graphene (LIG) technology, the resulting electrochemical sensor demonstrated excellent performance in detecting trace Cd 2+ . The sensor showed a linear detection range of 1.0–100.0 μg L −1 and a detection limit of 0.37 μg L −1 for Cd 2+ (S/N = 3), along with good stability and reproducibility. Furthermore, when applied to the detection of Cd 2+ in actual lake water samples, the sensor exhibited satisfactory recovery rates ranging from 95.21% to 98.24%. These results demonstrate the successful fabrication of a portable, highly sensitive LIG electrochemical sensor based on ANF. The resulting sensor exhibits excellent electrochemical performance, enabling high sensitivity for Cd 2+ detection. Beyond its analytical capabilities, this work signifies a notable advancement in LIG preparation methods using ANF. This innovative approach provides a novel pathway for developing high-performance and on-site detection devices.
研究领域:
环境监测
·
电分析化学
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纳米材料
·
传感器与生物传感器
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xiaoling Zhou,Zhuodong Li,Ou Xu,Shengji Yuan,Tao Huang,Bingsuo Zou
Lead-free metal halide perovskites have attracted considerable interest due to their excellent optical properties and environmental friendliness. However, their practical application is often hindered by a low photoluminescence quantum yield (PLQY). Herein, we report a novel Cd2+/Mn2+ codoped CsCaCl3 perovskite crystal that achieves a record-breaking PLQY of 93%, which is realized through a novel energy transfer pathway. By varying the Mn2+ doping concentration in CsCaCl3:4%Cd2+, the crystal’s emission color can be tuned from cyan to yellow across the 400–700 nm wavelength range. Interestingly, the material also exhibits a distinct hydrochromic behavior. Upon humid air exposure, it undergoes a structural transformation from CsCaCl3:Cd2+/Mn2+ to Cs2CaCl4·2H2O:Cd2+/Mn2+, accompanied by a dramatic emission color shift from yellow to orange. This process exhibits excellent reversibility over multiple wetting–drying cycles. The combination of ultrahigh PLQY, tunable luminescence, and stimuli-responsive hydrochromism makes this material highly promising for advanced applications in dynamic information encryption and anticounterfeiting. Moreover, the CsCaCl3:4%Cd2+/3%Mn2+ crystal exhibits tunable energy-transfer emission under different temperatures, achieving a high relative thermal sensitivity of 5.48%·K–1, demonstrating its potential for optical thermometry.
研究领域:
材料科学
·
光电子学
·
发光材料
·
刺激响应材料
·
信息安全
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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）