SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Zilan Yin,Qidong Zhao,Chuyi Xie,Gaohong He,Yonghou Xiao
With the rapidly growing demand of high-purity methanol, developing high-efficiency adsorbents has become urgent to completely remove metal ions from methanol. Herein, a novel adsorbent, ethylenediaminetetraacetic acid (EDTA) modified silica gel (EDTA-2N-Silica) was successfully prepared for copper ions deep removal from methanol. EDTA-2N-Silica was constructed by using 3-(2-amino-ethylamino) propyl-trimethoxysilane (Silicone A-1120) to graft the EDTA molecules onto the silicon hydroxyl groups over silica gel. Dynamic adsorption experiments revealed that copper ions could be effectively removed from methanol prior to breakthrough point, with almost complete elimination achieved before adsorption column exhaustion. Correspondingly, the breakthrough and equilibrium adsorption capacities of copper ions over EDTA-2N-Silica-0.375 achieved 0.159 and 0.846 mmol g −1 at 40 °C, respectively. According to the density functional theory calculation, the enhanced copper ions capture performance of EDTA-2N-Silica was mainly attributed to the copper ions complexation with N-containing and the O-containing groups from EDTA. Furthermore, after the fifth regeneration, the equilibrium adsorption capacity of EDTA-2N-Silica-0.375 toward copper ions could retain 87.82 % that of the fresh sample, indicating its satisfactory regeneration performance. Considering its excellent adsorption and regeneration performance, EDTA-2N-Silica adsorbent is expected to be employed for efficient removal of trace copper ions from methanol.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
WATER RESEARCH
·
2019
·
IF 7.913
Yuan Yuan,Wei Zhao,Zicheng Liu,Chen Ling,Changqing Zhu,Fuqiang Liu,Aimin Li
The efficient recovery of heavy metals from complexed wastewater is an essential but challenging task. In this study, a novel low-Fe(III) driven UV/Air process (LFUA) was developed to break the strong complexation between ethylenediamine tetracetic acid (EDTA) and heavy metal ions (HMIs) and enable the enhanced recovery of HMIs via chelating resin adsorption (CRA). The inside mechanism of the LFUA process includes: 1) displacement of HMIs from HMI-EDTA complexes by Fe(III); 2) direct photolysis of Fe(III)-EDTA through a ligand-to-metal charge transition reaction (LMCT) and indirect photolysis of EDTA by HO 2 ·/O 2 · - . The iron dosage was orders of magnitude lower than that previously reported, due to the Fe(II)/Fe(III) redox cycle in the LFUA process. Fe(II) formed during the LMCT reaction of Fe(III)-EDTA was oxidized back to Fe(III) by O 2 and HO 2 ·, and the reformed Fe(III) was then recombined with EDTA to sustains the LMCT reaction. EDTA was completely removed in 20 min at a molar ratio of Fe(III)/EDTA = 0.05. In addition, following the LFUA process, the adsorption amounts of various HMIs onto D463 resin were at least two orders of magnitude higher than those reported using the direct adsorption process. Employing the integrated technique of LFUA + CRA enabled the efficient removal of up to 64.5 mg/L of Cu(II) from inlet wastewater, and residual Cu(II) was below 0.5 mg/L. The results of desorption experiments showed that over 90% of Cu(II) was recovered, and the desorption solution had a Cu concentration of 2.1 g/L and purity of 99%. Furthermore, the economic and practical feasibility of using the combined process of LFUA + CRA was analyzed to substantiate that the technique is highly efficient and clean (produces no harmful sludge). Therefore, it is an appropriate and practical process in removing HMIs-EDTA complexes and recovering HMIs from wastewater.
研究领域:
环境科学
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化学工程
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Shu Wang,Bingliang Zhang
Nitrilotriacetic acid (NTA) and ethylenediaminetetraacetic acid (EDTA), as widely used chelating agents, have created many environmental issues and raised much attention regarding their environmental occurrence. However, the determination of NTA and EDTA in samples of complex solution chemistry remains challenging. Here, we proposed a simple and sensitive method based on liquid chromatography tandem mass spectrometry (LC-MS/MS) to determine NTA and EDTA from aqueous samples without an enrichment step. During the analysis, H + -cation exchange was used to efficiently eliminate interference from metal ions. The intensity of NTA and EDTA with trimethylsilyldiazomethane methylation could be improved hundreds of times that of the virgin samples. To maximize sensitivity, the sample pretreatment methods, the derivatization procedures and the LC-MS/MS conditions were systematically optimized. The validated method showed low limits of quantification (0.4 μg/L for NTA and 1.5 μg/L for EDTA), a wide linear response (up to several mg/L, R 2 > 0.998), and good intra- and inter-day precision (relative standard deviation ≤ 11%). The reliability of this method was successfully validated by analysis of authentic water samples collected from three WWTPs and one river with satisfactory recoveries (80–117%). It can be proposed as a powerful analytical method of NTA and EDTA in authentic water samples and could potentially be adapted to detect other chelates and polydentate compounds.
研究领域:
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
CHEMICAL ENGINEERING JOURNAL
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2014
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IF 4.058
Bo Yang,Jiaxing Zhang,Yunfei Zhang,Shubo Deng,Gang Yu,Jinhua Wu,Hong Zhang,Jianhong Liu
The low-cost Al–Ni alloy particles could achieve high dechlorination activity for 2-chlorophenol (2-CP) with the addition of tetrasodium EDTA (EDTA-4Na) in this study. The species of chelating agent, pH values, and the dosages of chelating agent were investigated for their effects on dechlorination efficiency of 2-CP in solution. EDTA-4Na presented the highest promoting effect for Al–Ni alloy in dechlorination process compared with other chelating agents, which is closely correlated with the conditional stability constant ( K f ′ ) of chelates formed. The optimized result showed that 0.389 mM of 2-CP was completely dechlorinated into phenol using 10 g L −1 of Al–Ni alloy and 10 mM of EDTA-4Na at initial pH 11.0 within 45-min reaction. Recycling tests of the alloy particles showed that Al–Ni alloy coupling with EDTA in aqueous solution exhibited high dechlorination activity and stability before being exhausted. The maintenance of Al–Ni alloy activity for dechlorination was mainly attributed to the promoting effect of EDTA-4Na on Al corrosion, the inherent structure of alloy with Ni crystal homogeneously dispersing into Al substrate, and the change of its surface morphology with more active sites formed by EDTA corrosion.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Liwei Ma,Shihua Zheng,Guoqiang Li,Xuejun Wang,Kangdi Chen,Guojie Zhang
Fe(II)EDTA can remove NO efficiently, but it has not been industrially applied. This is because the oxygen present in the flue gas will oxidize Fe(II)EDTA and Fe(II)EDTA-NO to Fe(III)EDTA and deactivate them. In order to solve this problem, this paper innovatively proposes to use NaHS to reduce Fe(III) EDTA, because NaHS has high reducing ability and low price. Therefore, a series of experimental conditions were explored in order to obtain the best reaction setup. The results indicate that increasing the concentrations of NaHS, temperature, and pH enhances the rate of NaHS reduction. The mechanism of the increase in reduction rate was studied in depth using potentiometric titration. It was found that an increase in OH - concentration will generate S 8 precipitate, which is beneficial to the forward progress of the reaction and promotes the large-scale production of the active component Fe 2+ . Oxygen is an inevitable factor in actual flue gas, so this study innovatively proposed a kinetic model under aerobic conditions and used this model to predict the trend of Fe(III)EDTA reduction by NaHS. On this basis, NO removal experiments were conducted under high oxygen conditions. After 15 cycles, the reduction performance of NaHS was still very high, and the NO removal rate was higher than 70%. The reason for this phenomenon is that the stabilizer exists in a form that is conducive to the removal of NO by the active component Fe 2+ . Therefore, this study provides theoretical guidance for promoting the industrial application of Fe(II) EDTA technology for NO removal.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
Processes
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2019
·Vol. 7
·期 6
·351
·
IF 1.963
Yali Liu,Xiaorong Kang,Han Cheng
The addition of Fe2+is considered an effective method for increasing methane production, but the added Fe2+may not be absorbed by anaerobic microorganisms due to complex chemical reactions. In this study, ethylenediaminetetraacetic acid (EDTA) was used as a ligand of Fe2+(EDTA-Fe) to promote the dissolution of Fe, and the anaerobic performances of kitchen wastes (KWs) in a semi-continuous reactor were studied. The results indicated that the biogas yields and methane contents were enhanced to 594–613 mL·g−1VSadd·d−1and 63.6–64.4% at an organic loading rate (OLR) of 2.5 gVSadd·L−1·d−1due to EDTA-Fe addition. Simultaneously, the EDTA-Fe was more effective than Fe2+in preventing the acidification of KWs with a high OLR (5.0 gVSadd·L−1·d−1). In addition, the sequential extraction results showed that the water-soluble fraction of Fe in the R3 (EDTA-Fe addition) was 1.49-fold of that in the R2 with Fe2+addition. The contents of coenzymes F420 and F430 were also improved 1.09 and 1.11 times, respectively. Mechanism analysis confirmed that the EDTA enhanced methane production and operational stability by promoting the dissolution of Fe and maintaining a high content of water-soluble Fe.Keywords:semi-continuous reactor;EDTA;Fe;kitchen wastes;methane
研究领域:
环境科学
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微生物学
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产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2020
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IF 3.333
Jiahong Wang,Min Mao,Saleem Atif,Yao Chen
The presence of widely used chelating agents such as ethylenediaminetetraacetic acid (EDTA) in aqueous solution increases the difficulty of heavy metal removal by the formation of heavy metal chelates. In this study, diethylenetriaminepentaacetic acid (DTPA)-chitosan functionalized magnetic silica (Fe 3 O 4 @SiO 2 /Cs-DTPA) was developed for the removal of Cr(III) and Cr(III)-EDTA. The obtained results from characterization confirmed that Fe 3 O 4 @SiO 2 /Cs-DTPA with the core-shell structure and superparamagnetic properties was synthesized. The maximum theoretical adsorption capacity of Cr(III) and Cr(III)-EDTA chelates on the adsorbents were 39.27 and 22.24 mg/g at 25 °C and pH 4.0, respectively. Adsorption equilibrium of Cr(III) and Cr(III)-EDTA on Fe 3 O 4 @SiO 2 /Cs-DTPA was achieved within 15 min, and the adsorption data fit the pseudo second-order model. The co-existing complex agents (EDTA) and cations (Na + , Ca 2+ , and Mg 2+ ) in the aqueous solution reduced Cr(III) adsorption by the competition with Cr(III) and Cr(III)-EDTA chelate for active groups of the adsorbent. The affinity of the Fe 3 O 4 @SiO 2 /Cs-DTPA for Cr(III) and Cr(III)-EDTA was excellent even at high salt and organic chelates concentration. The Cr(III) adsorption was attributed to surface complexation between Cr(III) and DTPA moieties of the adsorbent, while Cr(III)-EDTA as a whole was adsorbed on the adsorbent by the complexation and electrostatic interaction . Cr(III) saturated Fe 3 O 4 @SiO 2 /Cs-DTPA can be readily regenerated in acid solution and Cr(III) or Cr(III)-EDTA adsorption of regenerated adsorbent exhibits no obvious reduce.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jinghui Wang,Chengyu Wang,Yuhang Zhang,Zhijun Luo,Lingling Qu
A heat-activated sodium percarbonate and persulfate (heat-SPC-PS) system was employed to treat Cu(II)-EDTA wastewater effectively. In this binary-oxidant system, SPC functioned as an oxidant, precipitant, and neutralizer throughout the treatment process. Under optimized conditions (SPC dosage: 28.3 mM, PS dosage: 47.0 mM, temperature: 80 °C), the system achieved a Cu removal efficiency of 95.9 % and rate constant of 0.391 min −1 after 10 minutes of treating a 3.14 mM of Cu(II)-EDTA solution. The Cu ions released from Cu(II)-EDTA were precipitated as a mixture of CuO, CuCO₃, and Cu₂(OH)₂CO₃. Additionally, SPC neutralized the H⁺ ions generated from PS hydrolysis, yielding a final solution pH of approximately 7.86. When followed by an alkali precipitation (AP) step at pH 11, the combined heat-SPC-PS + AP process further increased Cu removal efficiency from 95.9 % to 98.4 %, with precipitation occurring as CuO. Reactive oxygen species (ROS) generated by heat-SPC-PS system, including OH • , SO 4 •- , O 2 •- , and 1 O 2 were key contributors to the decomplexation of Cu(II)-EDTA. Moreover, the treatment substantially reduced phytotoxicity of Cu(II)-EDTA solutions. Lettuce grown with the treated effluent exhibited growth indices comparable to those irrigated with deionized water, demonstrating the potential of the heat-SPC-PS system for the safe and effective treatment of heavy metal complexes in wastewater.
研究领域:
环境科学
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化学工程
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生物学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Huanggen Yang,Pei Zhang,Qi Zheng,Guochao Nie,Asif Hayat,Majed A. Bajaber,Saleem Raza,Duofu Li,Yan Sui
A unique combination of cotton fabric (CF) with a mixture of EDTA and APTES Fe 3 O 4 magnetic particles was developed and utilized for the first time as an adsorbent for removing pollutants from wastewater. Initially, Fe 3 O 4 was synthesized using the co-precipitation method. Further, the surface of Fe 3 O 4 was modified by introducing amino functional groups through a reaction with APTES, resulting in Fe 3 O 4 -NH 2 . Following this, the surface of carbon fiber (CF) was altered using ethylenediaminetetraacetic acid (EDTA) to create CF@EDTA. Through the use of EDC-HCl and NHS, Fe 3 O 4 -NH 2 was attached to the surface of CF@EDTA, resulting in the final product CF@EDTA/Fe 3 O 4 . Subsequently, the prepared CF@EDTA/Fe 3 O 4 was utilized to adsorb metal pollutants from wastewater, with a thorough analysis conducted using various characterization techniques including FTIR, SEM, EDX , XRD , VSM , and XPS to study the materials. The study specifically aimed to assess the adsorption performance of our cotton-based material towards As(III) and Cr 3+ metal ions. The pH study was also performed. Results indicated that the material exhibited an adsorption capacity of approximately 714 mg/g for As(III) ions and 708 mg/g for Cr 3+ ions. The Langmuir and Freundlich models, as well as pseudo-first and second-order models were also analyzed. The Langmuir and pseudo-second-order models were found to best fit the data. In terms of regeneration and reusability, the materials showed straightforward regeneration and recyclability for up to 15 cycles. The remarkable adsorption capacity, combined with the unique blend of cotton and Fe 3 O 4 magnet, along with its recyclability, positions our material CF@EDTA/Fe 3 O 4 as a promising contender for wastewater treatment and other significant areas in water research.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Separations
·
2025
·Vol. 12
·期 8
·205
·
IF 2.7
Yannan Lv,Shenrui Han,Wenqing Wen,Xinzhu Bai,Qiao Sun,Li Chen,Haonan Zhang,Fansong Mu,Meng Luo
This study developed a new magnetic adsorbent from waste coconut shells using high-temperature carbonization, EDTA-2Na chelation, and Fe3O4magnetic loading. Response surface methodology optimized the preparation conditions to a mass ratio of activated carbon: EDTA-2Na:Fe3O4= 2:0.6:0.2. Characterization (SEM, XRD, FT-IR, and EDS) showed that EDTA-2Na increased the surface carboxyl and amino group density, while Fe3O4loading (Fe concentration 6.83%) provided superior magnetic separation performance. The optimal adsorption conditions of Cu2+by EDTA-2Na-Fe3O4-activated carbon composite material are as follows: when pH = 5.0 and the initial concentration is 180 mg/L, the equilibrium adsorption capacity reaches 174.96 mg/g, and the removal rate reaches 97.2%. The optimal adsorption conditions for Pb2+are as follows: when pH = 6.0 and the initial concentration is 160 mg/L, the equilibrium adsorption capacity reaches 157.60 mg/g, and the removal rate reaches 98.5%. The optimal adsorption conditions for Cd2+are pH = 8.0 and an initial concentration of 20 mg/L. The equilibrium adsorption capacity reaches 18.76 mg/g, and the removal rate reaches 93.8%. The adsorption followed the pseudo-second-order kinetics (R2> 0.95) and Langmuir/Freundlich isotherm models, indicating chemisorption dominance. Desorption experiments using 0.1 mol/L HCl and EDTA-2Na achieved efficient desorption (>85%), and the material retained over 80% of its adsorption capacity after five cycles. This cost-effective and sustainable adsorbent offers a promising solution for heavy metal wastewater treatment.
研究领域:
环境科学
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材料工程
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化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2016
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IF 5.267
Jianhong Ma,Guiyin Zhou,Lin Chu,Yutang Liu,Chengbin Liu,Shenglian Luo,Yuanfeng Wei
A ethylenediaminetetra-acetic acid (EDTA) cross-linked chitosan and N,N-methylenebis(acrylamide) (MBA) cross-linked polyacrylamide based double network hydrogel was successfully synthesized via a two-step method and then employed for heavy metal ion adsorption. Various adsorption conditions, such as pH, ionic strength, adsorbent dosage, and contact time were investigated. CTS/PAM gel have a theoretical maximum Cd(II), Cu(II), and Pb(II) sorption capacities of 86.00, 99.44, and 138.41 mg/g, respectively, at experimental conditions. The adsorption process of CTS/PAM gel on the heavy metal ion was identified to be endothermic and follows an ion-exchange reaction. The application of this gel adsorbent was demonstrated using practical industrial effluent. We found that it could effectively treat practical wastewater with all kinds of heavy metals. At an adsorbent dosage of 8 g/L, the total metal ions concentration declined from 448.5 to 5.0 mg/L. Simultaneously, the CTS/PAM gel exhibited remarkable mechanical strength and good recyclability. This study shows that CTS/PAM gel offers great potential for practical application in the removal of heavy metal ions from contaminated aquatic systems.
研究领域:
环境科学
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材料科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2021
·Vol. 29
·期 2
·941-952
·
IF 5.044
Hu Tao,Hu Xiaoli,Tang Cheng,Liu Dan
This paper describes the synthesis of a novel chelating material derived from cellulose, and its heavy metal ion adsorption properties from aqueous solution. The first section of this paper reports the chemical grafting of cellulose, that amino acetic acid groups were grafted onto the cellulose by in situ synthesis, a novel yet unreported modified cellulose derivative N,N-(dicarboxymethylaminoethyl, carboxymethyl)aminoethylamine carboxymethyl cellulose amide was synthesized. This obtained adsorbent was characterized by elemental analysis, infrared spectroscopy (IR) and Solid State Nuclear Magnetic Resonance (SSNMR) 13 C NMR spectroscopy. In the second section, the adsorption of Cu 2+ and Pb 2+ from single metal ion aqueous solutions onto this adsorbent were evaluated and analyzed by the Freundlich and Langmuir models. Further more, adsorption capacity for Ba 2+ , Mg 2+ , Mn 2+ , Co 2+ , Zn 2+ , Pb 2+ , Ni 2+ and Cu 2+ , and the competitive adsorption of this adsorbent between ions were also evaluated by ICP spectroscopy. The results indicated that this modified cellulose exhibited adsorption properties similar to those of EDTA, and showed good adsorption capacity for a wide range of metal ions.
Graphical abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）