Nanomaterials
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2019
·Vol. 9
·期 11
·1532
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IF 4.034
Kai Xia,Yongfu Guo,Qijun Shao,Qu Zan,Renbi Bai
In order to reduce the difficulty and risk of operation, decrease the preparation time and improve the adsorption performance of magnetic nano-silicon adsorbent with core-shell structure, a carboxylated CoFe2O4@SiO2was prepared by EDTA-functionalized method using a safe, mild and simple hydrothermal method. The results show that the prepared material of CoFe2O4@SiO2-EDTA has a maximum adsorption capacity of 103.3 mg/g for mercury ions (Hg(II)) at pH = 7. The adsorption process of Hg(II) is a chemical reaction involving chelation and single-layer adsorption, and follows the pseudo-second-order kinetic and Langmuir adsorption isotherm models. Moreover, the removal of Hg(II) is a spontaneous and exothermic reaction. The material characterization, before and after adsorption, shows that CoFe2O4@SiO2-EDTA has excellent recyclability, hydrothermal stability and fully biodegradable properties. To summarize, it is a potential adsorption material for removing heavy metals from aqueous solutions in practical applications.Keywords:magnetic material;adsorption;heavy metal;mercury;EDTA functionalization
研究领域:
环境科学
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材料科学
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高影响因子
Materials Advances
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2024
·Vol. 5
·期 19
·7609-7616
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IF 5.2
Mao-Hsuan Peng,Chia-Chen Li
The new adsorbent EDTA@PSV, which is a hierarchical porous microsphere modified with ethylenediaminetetraacetic acid, has demonstrated its effectiveness in extracting valuable metals. With a high surface area of 665 m2 g−1 and a large porosity of 90%, it exhibits significant potential for adsorbing Co2+, as supported by density functional theory simulations and experimental results.
研究领域:
材料科学
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环境科学
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高影响因子
ACS Applied Materials & Interfaces
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2019
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IF 8.456
Yunzhe Jiang,Chuanyao Liu,Aisheng Huang
The removal of heavy-metal ions from wastewater has drawn intense attention, because of their toxicity, bioaccumulation tendency, and persistency in nature. Adsorption is regarded as one of the most promising methods, because of its simplicity and efficiency. In the present work, we report the preparation of a novel EDTA-functionalized covalent organic framework (COF) for the removal of heavy-metal ions. First, a COF named TpPa-NO2 was reduced to TpPa-NH2 by using Na2S2O4 as a reductant, and then EDTA dianhydride was grafted onto TpPa-NH2 to obtain TpPa-NH2@EDTA through post-modification. Both the COF morphology and structure remained unchanged after post-modification. The TpPa-NH2@EDTA showed excellent performance in adsorbing different types of heavy-metal ions, such as soft Lewis acid (Ag+, Pd2+), hard Lewis acid (Fe3+, Cr3+), and borderline Lewis acid (Cu2+, Ni2+), and the removal efficiencies are all >85% within 5 min, because of the strong chelation effect of EDTA. The TpPa-NH2@EDTA also showed high adsorption ability in a pH ≥3 environment and have an adsorption capacity of >50 mg/g for the six representative heavy-metal ions. This work provides a new idea for the application of COF materials in the removal of heavy-metal ions from wastewater.
研究领域:
环境科学
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材料科学
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高影响因子
RSC Advances
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2019
·Vol. 9
·期 38
·21996-22003
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IF 3.049
Huan Wang,Xin Lai,Wei Zhao,Youning Chen,Xiaoling Yang,Xiaohua Meng,Yuhong Li
In this study, EDTA functionalized corncob (EDTA-corncob) and EDTA/graphene oxide functionalized corncob (EDTA-GO/corncob) were prepared using disodium ethylenediamine tetraacetic acid and the graphene oxide immersion method. EDTA-corncob and EDTA-GO/corncob were characterized by SEM and FTIR spectroscopy. On this basis, the adsorption properties of EDTA-corncob and EDTA-GO/corncob were studied with crystal violet as the adsorbate. The optimum adsorption conditions were determined by the effect of samples on the adsorption properties of crystal violet at different times, temperatures and pH, and the reusability of the samples was studied. The results showed that adsorption capacity of crystal violet on EDTA-GO/corncob was higher compared with natural corncob and EDTA-corncob. The most suitable pH value of the solution is about 6.0, the adsorption equilibrium time is 200 min. EDTA-GO/corncob can be reused eight times. This study indicated that EDTA-GO/corncob is a reusable adsorbent for rapid, low-cost, and efficient removal of dye from waste water.
研究领域:
环境科学
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材料科学
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
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IF 5.162
Zhenwei Lian,Yanfeng Li,Hongyi Xian,Xiao-kun Ouyang,Yuqing Lu,Xiaowu Peng,Dalin Hu
A novel ethylenediaminetetraacetic acid (EDTA)-functionalized magnetic chitosan oligosaccharide and carboxymethyl cellulose (Fe 3 O 4 @CMCCOS-EDTA) nanocomposite adsorbent was successfully fabricated for Pb(II) adsorption. The adsorbent was characterized by Fourier transform infrared, and X-ray photoelectron spectroscopy was used to confirm successful EDTA modification and Pb(II) adsorption. Scanning electron microscopy, transmission electron microscopy , vibrating sample magnetometer, and thermogravimetric analysis were used to study the morphology and properties of magnetic particles. EDTA modification considerably improved the capacity of the adsorbent. The batch adsorption experiment results indicated that the pseudo-second-order (PSO) model and the Langmuir isotherm model reliably described the adsorption behavior. The maximum adsorption capacity ( q m ) for monolayer chemical adsorption was calculated to be 432.34 mg/g at the pH of 5 and temperature of 308 K. Notably, Fe 3 O 4 @CMCCOS-EDTA exhibited a high Pb(II) removal rate of ~100% using an initial metal ion solution of 100 mg/L and 200 mg/L.
研究领域:
环境科学
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材料科学
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 132
·期 32
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IF 1.768
Zhengyan Tan,Hong Peng,Hongfang Liu,Linling Wang,Jing Chen,Xiaohua Lu
A novel magnetic adsorbent (EDTA /chitosan/ PMMS) was facilely prepared by reacting chitosan with EDTA anhydride in presence of PEI - coated magnetic microspheres. The as-synthesized EDTA/ chitosan /PMMS was characterized by XRD, SEM, TGA, FT-IR , and VSM, and then employed in removal of heavy metals of Pb(II) from aqueous solution. The results of the batch adsorption experiments revealed that the adsorbents had extremely high uptake capacities for Pb(II) in the pH range of 2 to 5.5, and the adsorption kinetics for EDTA/ chitosan /PMMS was consistent with the pseudo – second - order kinetic model. Moreover, its equilibrium data were fitted with the Langmuir isothermal model well, which indicated that the adsorption mechanism was a homogeneous monolayer chemisorptions process. The maximum adsorption capacity of EDTA/ chitosan /PMMS for Pb(II) was found to be 210 mg g − 1 at pH 4 (30 ° C), and further reuse experiments results suggested that EDTA /chitosan/ PMMS could be a potential recyclable magnetic adsorbent in the practical wastewater treatment. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42384.
研究领域:
环境科学
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材料科学
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高影响因子
ENVIRONMENTAL TECHNOLOGY
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2021
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IF 3.247
Donghai Yuan,Wanxia Liu,Jiazhuo Wang,Jun Cui,Liansheng He,Chenling Yan,Yingying Kou,Junqi Li
In this study, an efficient adsorption and reusable magnetic ligand material (Fe3O4@Chitosan-EDTA) was synthesized by binding EDTA dianhydride onto magnetic chitosan, and it was employed in removal of Co(II) from aqueous solution. The maximum adsorption capacity of Co(II) onto Fe3O4@CS-EDTA was 48.78 mg/g at pH = 5 (303 K), which is much higher than that of Fe3O4@Chitosan as well as chitosan. The kinetics of Co(II) on the Fe3O4@CS-EDTA was consistent with the pseudo-second-order model. The equilibrium data were better fit with the Langmuir isothermal model than with the Freundlich isothermal model, suggesting that the adsorption mechanism was chemical monolayer homogeneous adsorption. The thermodynamic data showed that the sorption of Co(II) was spontaneous. Furthermore, after four cycles, the adsorption capacity of Co(II) onto the Fe3O4@CS-EDTA still retained 84.5% of the capacity of the fresh adsorbent, indicating that Fe3O4@CS-EDTA can be considered a promising recyclable adsorbent to remove heavy-metal ions from wastewater.
研究领域:
环境科学
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材料科学
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高影响因子
ENVIRONMENTAL POLLUTION
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2022
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IF 9.988
Yue Gao,Lifeng Yao,Shengzu Zhang,Qinyan Yue,Weiyan Yin
The metal-organic frameworks/cotton fabric composites (MOFs/CFCs) have emerged as a new type of prospective materials for environmental cleanup , due to their convenient recyclability and high removal efficiency towards hazardous pollutants . However, their practical applications are limited by complicated synthetic conditions, insufficient interface bonding and poor adsorption capacity. Herein, for the first time, a robust ethylenediaminetetraacetic acid (EDTA)-functionalized MOFs/CFC is prepared based on UiO-66-NH 2 crystals by using EDTA dianhydride as the cross-linking agent, and applied for simultaneous removal of heavy metals and dyes, as well as degradation of chemical warfare agents. The as-prepared EDTA-UiO-66-NH 2 /CFC shows extraordinary monocomponent adsorption performance with maximum adsorption capacity of 158.7, 126.2, 131.5, 117.4 and 104.5 mg/g for Cd(II), Cu(II), methylene blue , crystal violet and safranin O, respectively. Interestingly, in metal-dyes binary system, the uptake of Cu(II) by EDTA-UiO-66-NH 2 /CFC increases significantly when co-existing high concentration of dyes. The results indicate that the synergistic and simultaneous removal of both dyes and metal from complex systems can be realized by EDTA-UiO-66-NH 2 /CFC via multiple mechanisms. The EDTA-UiO-66-NH 2 /CFC also exhibits an outstanding catalytic performance for degrading dimethyl 4-nitrophenylphosphate. Besides, it can be reused for several times without obvious decrease of its adsorption and catalysis efficiencies. More impressively, the cross-linking reaction approach can not only anchor UiO-66-NH 2 crystals firmly onto cotton fabric, but also facilitate in-situ formation of abundant adsorption sties on the adsorbent surface. Therefore, this work offers a simple and versatile synthetic strategy to develop high-performance environmental material for multiple pollutants remediation.
研究领域:
环境科学
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材料科学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Bo Chen,Huinan Zhao,Sijiang Chen,Fengxia Long,Bin Huang,Benqin Yang,Xuejun Pan
Ascribing to their significant differences in physicochemical properties , it is extremely challenging to treat complex wastewater containing more than one class of pollutants via one-step treatment. Here, we focused on disposal of complex wastewater bearing organic dye and heavy metal by using adsorptive method. Thus, we successfully fabricated a novel and versatile EDTA functionalized magnetic chitosan composite adsorbent (Fe 3 O 4 -CS/EDTA) for simultaneous removal of methyl blue(MB) and heavy metal (Pb(II) and Cu(II)) from complex wastewater. In this setting, EDTA chelating groups are mainly responsible for the binding of heavy metals, while the protonated amino groups of CS adsorb anionic dyes through electrostatic interaction, thus enabling the simultaneous capture of these two classes of pollutants. In mono-pollutant system, the resulting material showed prominent uptake ability toward MB, Pb(II), and Cu(II) with uptake characteristics of pseudo-second-order model and Langmuir isotherm equation. The maximum monolayer uptake capacities were determined to be 225.0 mg g −1 of Cu(II), 220.0 mg g −1 of Pb(II), and 459.9 mg g −1 of MB at 303 K, respectively. More interestingly, in metal-MB binary system, uptake of MB was almost not affected by coexisting metal. While the uptake capacity of Cu(II) or Pb(II) was enhanced with increasing of MB concentration. These results demonstrated the synergetic removal performance of as-designed adsorbent toward cationic metal ions and anionic dye. Moreover, as-resulting adsorbent showed no significant adsorption capacity loss even after 8 runs of sorption-desorption cycle, manifesting that it is of great stability and could be regarded as a promising candidate adsorbent for treating complex wastewater. This study provides some insights into the design of highly efficient adsorbents with spatially separated sorption sites for disposing complex wastewater bearing organic and metallic contaminants.
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高影响因子
危险品化学品经营许可证（带存储）