ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2020
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IF 4.872
Jiahong Wang,Yao Chen,Tongtong Sun,Atif Saleem,Chuanyi Wang
A novel amino-functionalized magnetic adsorbent (Fe 3 O 4 @C@DETA) was developed for adsorption of Cr(III) and Cr(III)-EDTA from wastewater. Fe 3 O 4 @C@DETA were successfully prepared by modification of Fe 3 O 4 @C with diethylenediamine (DETA), which exhibits a core-shell structure and sufficient saturation magnetization. Fe 3 O 4 @C@DETA exhibits much better adsorption performance for Cr(III) and its chelates than the Fe 3 O 4 @C because of newly introduced amino active sites. The enhanced adsorption capacity of Fe 3 O 4 @C@DETA for Cr(III) is 44.74 mg g −1 (at 25 °C and pH 3.0), which is due to the surface coordination with the newly introduced amino functional sites. The Cr(III)-EDTA anions as a whole was adsorbed through the electrostatic interaction with protonated amino species of the Fe 3 O 4 @C@DETA and have maximum adsorption capacity of 47.27 mg g −1 (at 25 °C and pH 3.0). The adsorption data of free and EDTA coordinated Cr(III) were followed the Langmuir equation, while the adsorption dynamics was well explained by pseudo second order model indicating the chemical nature of adsorption process. The higher concentration of Ca 2+ ions in the wastewater compete for adsorption sites and inhibit the Cr(III) removal, while on other hand Ca 2+ ions promotes the adsorption of Cr(III)-EDTA, because of electrostatic interaction with adsorbent active sits. Furthermore, the adsorbent can be easily separated by external magnetic field and regenerated in acidic solution. The adsorbent is stable, recyclable and have more than 75% regeneration efficiency and can be repeatedly used in the adsorption process.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Weiying Li,Li Liang,Yue Li,Yu Tian,Jiping Chen,Sheng Chen,Junpeng Zhang
Recently, EDTA-chelated Cd II (Cd II -EDTA) was effectively removed by sulfidated nanoscale zero-valent iron (S-nZVI). However, few studies have been performed to investigate the influence of co-existing ions and emerging contaminants (such as microplastics) on the performance of S-nZVI toward Cd II -EDTA, which is vital for the application of S-nZVI in practical wastewater treatment. In this study, the individual effects of different co-existing ions (NO 3 − , SO 4 2− , PO 4 3− , Mg 2+ , Cu 2+ , and Zn 2+ ) and polystyrene (PS) microplastics with different concentrations on the removal of Cd II -EDTA by S-nZVI were systematically investigated. The removal capacity of S-nZVI toward Cd II -EDTA fell in the range of 579.3–644.7, 612.3–670.2, 607.4–691.3, 533.3–623.6, 79.9–545.3, 544.3–631.7, and 568.6–663.8 mg/g for the presence of NO 3 − , SO 4 2− , PO 4 3− , Mg 2+ , Cu 2+ , Zn 2+ , and PS microplastics over the concentration range of 10.0–150.0 mg/L, respectively, which were all smaller than that of the system of Cd II -EDTA alone (746.6 mg/g), indicating that all of the investigated co-existing substances showed inhibitory effects on Cd II -EDTA removal. As for NO 3 − , SO 4 2− , or Mg 2+ -containing system, the inhibitory effect was ascribed to the influence of S-nZVI corrosion rate; As for PO 4 3− , Mg 2+ , Cu 2+ , Zn 2+ , or PS microplastics-containing system, the negative effect was caused by changing the corrosion of S-nZVI and occupying the reactive sites at the surface of S-nZVI. The final corrosion products of S-nZVI under different reaction conditions were strongly dependent on the species and concentration of co-existing substance with the combinations of γ-FeOOH, α-Fe 2 O 3 , FeO, or β-FeOOH as the dominant corrosion products.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Li Liang,Weiying Li,Yue Li,Wei Zhou,Jiping Chen
In this study, the removal mechanisms of sulfidated nanoscale zero-valent iron (S-nZVI) toward EDTA-chelated Cd II (Cd II -EDTA) and the detailed effects of some critical factors on Cd II -EDTA removal by S-nZVI were systematically investigated. The results showed that the removal capacity of S-nZVI toward Cd II -EDTA within 90 min of reaction was 746.6 mg/g (when the initial concentration of Cd II -EDTA, the dosage of S-nZVI, and the initial solution pH were 300.0 mg Cd II /L, 0.3 g/L, and 2.6, respectively), which was 6.2 and 2.5 times higher than that of nZVI and Na 2 S, respectively, indicating that Fe and S had coupled effect on Cd II -EDTA removal. The removal mechanisms of Cd II -EDTA by S-nZVI consisted of two-step replacement reactions. In brief, Fe III generated from the corrosion of S-nZVI firstly replaced the Cd II in Cd II -EDTA, and then the decomplexed Cd II ions were immobilized by occurring the second-step replacement reaction with FeS in S-nZVI and forming CdS phase. Batch experiment results indicated that the removal of Cd II -EDTA by S-nZVI decreased as the initial Cd II -EDTA concentration increased and S-nZVI dosage decreased. Under the same S-nZVI dosage (0.3 g/L) and initial Cd II -EDTA concentration (300.0 mg Cd II /L), the acidic initial pH (pH 0 = 2.6) was favorable for the removal of Cd II -EDTA. This study demonstrated that S-nZVI could be a viable choice for the Cd II -EDTA-contaminated wastewater treatment.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Junwei Xin,Lei Wang,Xudong Wang,Rui Miao,Jin Wang,Han Sun,Jiajin Hao
Covalent organic frameworks (COFs) membranes have demonstrated exceptional adaptability and promising potential for precision ion-selective separation in aqueous solutions due to the fact that their pore size and charge intensity can be tailored through coordinated structural modulation. Chelation-assisted membrane separation technologies represent a highly effective strategy for separating and recovering similar divalent transition-metal ions (e.g., Ni 2+ , Co 2+ , and Mn 2+ ). In this approach, conventional chelating agents, such as ethylenediaminetetraacetic acid (EDTA), selectively bind to specific divalent metal (M 2+ ) ionic species in aqueous mixtures, forming negatively charged M–(EDTA) 2− complexes. By regulating the COFs membranes with appropriate pore size and intrapore charge density, the significant physicochemical differences between the M 2+ ions and the M–(EDTA) 2– complexes formed through the selective chelation can be leveraged to achieve their efficient separation. This enables the effective separation of Ni 2+ , Co 2+ , and Mn 2+ ions via membrane-based techniques. In this study, a two-step solvothermal–casting approach was employed to synthesize highly crystalline COF membranes with tunable content of the intrapore sulfonic acid (–SO 3 H) group. By modulating the –SO 3 H group content, the issue associated with the inherent trade-off between the M 2+ permeation flux and the M–(EDTA) 2− complex ion rejection efficiency could be overcome, and an optimal membrane separation performance was obtained. The synthesized membranes can selectively separate Ni 2+ , Co 2+ , and Mn 2+ in both binary and ternary systems through an EDTA-chelation-assisted dialysis process, which is remarkably stable under operational conditions. Furthermore, the membranes demonstrate superior M 2+ permeability compared with commercial cation-exchange membranes in EDTA-chelation-assisted electrodialysis. These findings provide valuable insights into the design of membrane structures for the effective separation and recovery of similar divalent transition metal ions (e.g., Ni 2+ , Co 2+ , and Mn 2+ ) in aqueous solutions.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
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2025
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IF 3.2
Qi Yuan,Wang Jinmin,Zhang Xingxing,Wu Yongqing,Gao Xiangdong
SiO 2 aerogel is a typical thermal insulation material suitable for varied high temperature industrial applications. However, its radiative transparency seriously hampers its application scenario. Herein, we integrated infrared (IR) opacified Fe 2 O 3 nanoparticles into silica aerogel system and developed a Fe 2 O 3 /SiO 2 composite aerogel (FSA) by using industrial water glass and ambient pressure drying process. Especially, we chelated Fe 3+ with disodium ethylenediaminetetraacetic (EDTA-2Na) to avoid the loss of Fe 3+ in the gelling, solvent-exchanging and hydrophobic modification processes. FSA powders with 3–11% concentration exhibited an amorphous structure, high porosity with small nanopores (11–12 nm). The EDS analysis confirmed the presence of Fe in the aerogel samples. The high-temperature thermal insulation properties of the FSA powders were enhanced compared with the pure SiO 2 aerogel powders, yielding a cold surface temperature of 456 ℃ after heating at 600 ℃ for 30 min, 26 ℃ lower than pure SiO 2 aerogel. The EDTA-2Na chelating agent improved the dispersion of Fe 3+ and further reduced the temperature by 6 ℃, demonstrating its positive effect on the insulation performance.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Kai Lin,Zuming He,Long Shen,Jiangbin Su,Zhengyi Huang,Yongmei Xia,Yong Wang
To address the issue of poor cycling performance and capacity of Mn-based Prussian Blue analogues (PBAs) as sodium ion battery cathodes due to the solubility of Mn ions, this study utilizes the strong chelating property of EDTA 2− with Mn ions to hydrothermally modify the sodium-rich monoclinic Na 1.75 Mn[ Fe ( CN ) 6 ] 0.94 ·2.25H 2 O synthesized under high salt conditions, in order to enhance its capacity and stability. The modified Na 1.93 Mn[Fe(CN) 6 ]•2·.38H 2 O exhibits a discharge capacity of 156.16 mAh/g at 10 mA g −1 (91.86 % of the theoretical capacity), it still retains the highest discharge capacity (70.23 mAh/g) after 500 cycles at 100 mA g −1 . Based on experimental analysis, the improvement in the electrochemical performance of PBAs was attributed to three main factors: (1) enhanced Na content; (2) suppression of defects; and (3) improved crystal structure.
研究领域:
材料科学
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电化学
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能源存储
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无机化学
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固态化学
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电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）