Water
·
2022
·Vol. 14
·期 9
·1420
·
IF 3.53
Juan Peng,Yameng Ma,Xiao Huang,Jianghua Yu,Fengjiao Yu,Jingsi Gao
Ni-ethylenediaminetetraacetic acid (Ni-EDTA) poses serious threats to the ecological environment and human health, due to its acute toxicity and low biodegradability. The decomplexation efficiency of Ni-EDTA through the conventional Fenton process has been constrained to pH; thus, other appropriate approaches are required to destroy the stable chelate structure at a neutral pH. In this study, the effect of operating parameters such as the pH, Fe2+concentration, particle electrode dosage, current density, and coexisting ions was studied. The results revealed that the 3D-EF system owned advantages for the removal of Ni-EDTA in the broadening of the pH application window. The Ni-EDTA removal efficiency in the 3D-EF system reached 84.89% after 120 min at a pH of 7. In addition, the presence of coexisting ions slightly affected the decomplexation efficiency of Ni-EDTA.Keywords:Ni-EDTA;three-dimensional electro-Fenton;neutral pH;decomplexation
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Wei Zhang,Ping Xiong,Qiao Li,Jiansheng Li,Jinyou Shen,Pengyu Zhu,Xiuyun Sun,Jingyu Lu,Ya Hu
EDTA-complexed heavy metals (EDTA-CHMs), one of the typical contaminants in industrial effluents , present challenges for wastewater purification because of their stability and high solubility over a wide pH range. Selective adsorption of various EDTA-CHMs coexisting in industrial wastewater is crucial for the recovery of heavy metal resources. Hence, investigating the competitive behavior and selective adsorption mechanisms of coexisting EDTA-CHMs during the effluent removal process is worthwhile. In this study, we chose Ferrihydrite (Fh) as the adsorbent and focused on the competitive adsorption behavior of two common EDTA-CHMs (EDTA-Cu(Ⅱ) and EDTA-Cr(Ⅲ)) on the Fh surface, as well as their removal mechanisms. For binary systems (EDTA-Cu(Ⅱ) and EDTA-Cr(Ⅲ)), the maximum adsorption capacity of Fh for EDTA-Cu(Ⅱ) was 17.32 mg/g, but because of the coexisting EDTA-Cu(Ⅱ), adsorption of EDTA-Cr(Ⅲ) by Fh was severely inhibited. In a competition experiment with binary contaminants of different EDTA complexes, Fh consistently exhibited stronger adsorption performance on EDTA-Cu(Ⅱ) when the ratio and addition order of EDTA-Cu(Ⅱ) and EDTA-Cr(Ⅲ) in the coexisting system was changed, and the valence state of the EDTA-CHMs was the key factor. The adsorption mechanism indicated that Fh could directly adsorb EDTA-CHMs through electrostatic interaction and surface complexation. The recycling rate of EDTA-Cu(Ⅱ) was still approximately 70.63% after five cycles of treatment with Na 2 SO 4 solution. This study provides new insights into the adsorption behavior of coexisting EDTA-CHMs on adsorbents and the selective removal of related pollutants.
研究领域:
环境科学
·
化学
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DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Yu Bai,Yun Zhao,Yang Li,Jiachao Xu,Xiaoting Fu,Xin Gao,Xiangzhao Mao,Zhaoyong Li
In this study, we fabricated a soft, transparent UV-shielding film (Alg-Fe 3+ -EDTA) by crosslinking sodium alginate with a ferric ion solution containing EDTA. The obtained films were characterized via SEM, ATR-FTIR, XRD, TG and DTG; the results indicated that the synergistic gelation of ferric alginate and alginic acid existed in Alg-Fe 3+ -EDTA film. The Alg-Fe 3+ -EDTA film performance to be optimized under the following conditions: 1.6% Fe 3+ , 0.8% EDTA, and crosslinking duration of 12 min. The Alg-Fe 3+ -EDTA film had high visible light transmittance, the UV-C (200–280 nm) and UV-B (280–315 nm) shielding rates were 100%, and the UV-A (315–400 nm) shielding rate was 98.37%; the UPF reached 50+; additionally, the tensile strength and elongation-at-break were 56.85 MPa and 10.45%, respectively, and still have ultraviolet shielding effect under water environments or after strong light irradiation. This work provides an efficient method to improve the optical and mechanical ability of ferric alginate films.
研究领域:
材料科学
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生物医学工程
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 27
·期 1
·812-822
·
IF 2.914
Xu Suyun,Yan Ning,Cui Minghao,Liu Hongbo
In this study, ozone-oxidation was used to treat synthetic chemical plating solution containing Cu(II)/Ni(II)-EDTA solution to realize the purpose of decomplexation. The effects of solution pH, initial concentration of Cu(II)/Ni(II)-EDTA, the molar ratio of EDTA to Cu(II)/Ni(II), and the coexistence of Cu(II)/Ni(II) on their removal efficiencies were investigated. The degradation of EDTA-Cu(II) and EDTA-Ni(II) were mainly attributed to OH oxidation, and the removal rates of Cu(II)/Ni(II) depend on the complete decomplexation. The removal rates of Cu(II) and Ni(II) was affected by the pH of solution, and the optimal pH was found to be 7–9; nevertheless, their removal rates can still be up to 90% even in acidic pHs of 3~5. When the molar ratio of EDTA to Cu(II)/Ni(II) increased from 1:1 to 3:1, the kinetics of metal ion removal rate declined from 0.0788 and 0.1139 min -1 to 0.0250 and 0.0271 min -1 . The synergistic effect was found in the Cu(II)/Ni(II) blended system due to the higher catalytic capability and the lower complexation affinity toward EDTA for Ni(II). In summary, ozone oxidation can be considered as an effective technology to realize the complete decomplexation of Cu(II)/Ni(II)-EDTA that contained in chemical plating industry wastewater.
Graphical Abstract
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 7
·1-8
·
IF 2.101
Zhao Chenhao,Fang Shuzhen,Hu Zhibiao,Qiu Sheng’en,Liu Kaiyu
The carbon substrate with unique 3D macroporous structure has been prepared through the immediate carbonization of ethylenediaminetetraacetic acid (EDTA) and KOH mixture. The porous carbon composed of micro- and small mesoporous (2–5 nm) structure has a BET specific surface area of 1824.8 m 2 g −1 . The amorphous and nanosized Se is uniformly encapsulated into the porous structure of porous carbon using melting diffusion route, and the weight content of Se in target Se/C composite can be as high as ~50 %. As an Li–Se battery cathode, the Se/C composite delivers a reversible (2nd) discharge capacity of 597.4 mAh g −1 at 0.24C and retains a discharge capacity of 538.4 mAh g −1 at 0.24C after 100 cycles. Furthermore, the composite also has a stable capacity of 291.0 mAh g −1 at a high current of 4.8C. The high specific area and good porous size of EDTA-derived carbon substrate may a be responsibility for the excellent electrochemical performances of Se/C composite.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yuhang Zhang,Hao Zhang,Nuanqin Zhang,Biao Zhou,Falong Jia,Lizhi Zhang,Zhihui Ai,Xiao Liu
Cadmium (Cd) contamination is highly toxic to human health, and the complexed Cd in wastewater is tricky to remove owing to its stable chelating structure. In this study, industrial zero-valent iron (ZVI) was modified by ball-milling with tiny formic acid (FA), and the as-prepared sample (FA-ZVI bm ) was attempted in the treatment of Cd II -ethylenediaminetetraacetic acid (Cd II -EDTA). Little FA addition to ball-milling could dramatically improve the performance of FA-ZVI bm towards Cd II -EDTA elimination and raise the elimination rate constant by more than 200 times. Results ascertained that the (HCOO) 2 Fe II shell formed on FA-ZVI bm promoted Cd II -EDTA decomplexation and activation of dissolved O 2 to reactive oxygen species (ROS) for oxidative degradation of EDTA ligands. Cd II -EDTA was instantly decomplexation by Fe 3+ replacement, and the decomplexed Cd 2+ was rapidly captured by FA-ZVI bm . At the same time, the EDTA ligands underwent oxidative degradation, avoiding the re-chelation ecological hazard. Interestingly, we found that replacement decomplexation has a synergistic mechanism for activating dissolved O 2 to ROS , facilitating oxidative destruction of EDTA ligands. Furthermore, the FA-ZVI bm fixed-bed reactor could remediate Cd II -EDTA contaminated environmental water one-stop, and the effluent stably meets the emission standards. This study demonstrated that FA-ZVI bm could be a viable approach for Cd II -EDTA decontamination and clarified the remediation mechanism.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2021
·
IF 7.328
Xiangping Wen,Guangming Wen,Wenyan Li,Zhonghua Zhao,Xine Duan,Wenjun Yan,John F. Trant,Yingqi Li
Fluorescent carbon dots (CDs) were hydrothermally synthesized from a mixture of frozen tofu, ethylenediamine and phosphoric acid in an efficient 64% yield. The resulting CDs exhibit good water solubility, low cytotoxicity, high stability, and excellent biocompatibility. The CDs selectively and sensitively detect Co 2+ through fluorescent quenching with a detection limit of 58 nM. Fluorescence can be restored through the introduction of EDTA, and this phenomenon can be used to quantify EDTA in solution with a detection limit of 98 nM. As both analytes are detected by the same CD platform, this is an “off-on” fluorescence sensor for Co 2+ and EDTA. The technique's robustness for real-world samples was illustrated by quantifying cobalt in tap water and EDTA in contact lens solution. The CDs were also evaluated for in vivo imaging as they show low cytotoxicity and excellent cellular uptake. In a zebrafish model, the CDs are rapidly adsorbed from the intestine into the liver, and are essentially cleared from the body in 24 h with no appreciable bioaccumulation. Their simple and efficient synthesis, combined with excellent physical and chemical performance, renders these CDs attractive candidates for theranostic applications in targeted “smart” drug delivery and bioimaging.
研究领域:
分析化学
·
生物医学工程
·
材料科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Yuwei Pan,Zhuoyu Bu,Cunxing Sang,Hongjin Guo,Minghua Zhou,Ying Zhang,Yusi Tian,Jingju Cai,Wei Wang
Ethylenediaminetetraacetic acid (EDTA) was used to enhance pre-magnetized Fe 0 /H 2 O 2 process for sulfamethazine (SMT) removal at neutral pH. Only 19.4% SMT was removed in pre-Fe 0 /H 2 O 2 within 60 min at neutral pH while 90.6% SMT was removed after addition of 0.1 mM EDTA. Meanwhile, k (10 3 ) value for SMT removal in pre-Fe 0 -EDTA/H 2 O 2 was 1.3 folds larger than in Fe 0 -EDTA/H 2 O 2 . Single-factor experiments and response surface methodology (RSM) were used to optimize the system for SMT removal. Maximum k (10 3 ) value was 81.4 min −1 obtainning at conditions of Fe 0 0.28 g L −1 , EDTA 0.13 mM, and H 2 O 2 36.2 μM. The presence of EDTA and magnetization could inhibit the generation of iron oxides , reduce the contact angle of Fe 0 , and improve the recovery of surface Fe II which induced a faster catalytic decomposition of H 2 O 2 . The system could still achieve good performance for removing SMT after six consecutive reaction cycles. These results demonstrated that pre-Fe 0 -EDTA/H 2 O 2 system has the potential application for wastewater treatment .
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Yu Liu,Ruiqi Fu,Yue Sun,Xiaoxin Zhou,Shams Ali Baig,Xinhua Xu
In this study, EDTA-functionalized Fe 3 O 4 (Fe 3 O 4 @SiO 2 -EDTA) was prepared by silanization reaction between N-(trimethoxysilylpropyl) ethylenediamine triacetic acid (EDTA-silane) and hydroxyl groups for Pb(II) and Cu(II) removal from aqueous solutions. Fe 3 O 4 @SiO 2 -EDTA composites were characterized using SEM, TEM, EDX, FTIR, XPS, TGA and saturated magnetization techniques. Maximum Pb(II) adsorption capacity was found to be 114.94 mg g −1 with SiO 2 /EDTA molar ratio of 2.5:1. The adsorption rate was significantly fast and the equilibrium was reached within 10 min. The optimum pH was recorded to be 5.0. The maximum adsorption capacity of the studied heavy metal ions calculated by Langmuir model followed the order: Cu(II) (0.58 mmol g −1 ) > Pb(II) (0.55 mmol g −1 ) ≈ Ni(II) (0.55 mmol g −1 ) > Cd(II) (0.45 mmol g −1 ). Moreover, Pb(II) and Cu(II) adsorption capacities were not significantly affected by co-existing cations and NOM. These results suggested that this adsorbent can be considered as a promising adsorbent to remove Pb(II) and Cu(II) from wastewaters.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Bo Yue,Zhongwei Pang,Yang Yu,Jianfei Wu,Jiafu Qu,Jundie Hu,Dan Tian,Jianzhang Li,Yahui Cai
The environmental pollution caused by the discharge of oily wastewater and printing and dyeing wastewater is becoming more and more serious. Therefore, it is necessary to find an efficient method to separate oil/water emulsions and remove organic dyes from water simultaneously. However, the traditional separation membranes are usually very expensive and easy polluting the environment. Therefore, how to prepare high-efficiency separation membrane from low-cost, green renewable materials remains a huge challenge. In this study, ethylenediaminetetraacetic acid (EDTA) modified metal–organic framework (MOF-808) nanoparticles were introduced into the wood substrate to construct a 3D wood/MOF-808-EDTA membrane with efficient water purification performance (oil/water emulsion separation and organic dye removal). Due to the introduction of hydrophilic MOF-808-EDTA nanoparticles, this novel membrane can effectively separate stable oil-in-water emulsions and remove organic dyes from water. The prepared wood/MOF-808-EDTA membrane has a high separation efficiency (more than 99.9 %) and permeation flux (1698 ± 15.85 L·m −2 ·h −1 ). The removal efficiency of organic dyes is more than 94 % with the permeation flux 1360 ± 2.54 L·m −2 ·h −1 . More importantly, the separation efficiency (oil/water emulsion) remained above 99.9 % and the dye removal efficiency was still above 90 % after 10 cycles. Additionally, the wood/MOF-808-EDTA membrane also has good mechanical/chemical stability and anti-fouling properties. This work opens a new approach for the development of functional biomass material membranes for sewage purification.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yuwei Pan,Hongjin Guo,Minghua Zhou,Ying Zhang,Yusi Tian,Wei Wang
This study presents a novel pre-magnetized Fe 0 /ethylenediaminetetraacetic acid/air (pre-Fe 0 /EDTA/air) Fenton-like system to remove sulfamethazine (SMT). SMT removal only reached 10.6% in pre-Fe 0 /air system (0.2 g L −1 , SMT 3 mg L −1 , pH 5) while reached 88.5% in pre-Fe 0 /EDTA/air system within 1 h (0.2 g L −1 , SMT 3 mg L −1 , EDTA 2 mM, pH 5). EDTA could combine with Fe II or Fe III to keep iron soluble in the solution and the fast activation of molecular oxygen by Fe-EDTA complex could induce the fast and more production of H 2 O 2 . It was found that much more H 2 O 2 (5.1 mg L −1 ) and OH radical (26.4 μM) were produced in the pre-Fe 0 /EDTA/air system than in the pre-Fe 0 /air system (0.06 mg L −1 , 0.6 μM) within 1 h. The degradation rate of SMT (1 0 3 ) in pre-Fe 0 /EDTA/air system (38.4 min −1 ) was also 2.3 times as large as that in the Fe 0 /EDTA/air system (17.0 min −1 ), owing to the fast corrosion rate of pre-Fe 0 . 81.5 mgL −1 total Fe ions could be generated in pre-Fe 0 /EDTA/air while 53.6 mg L −1 in Fe 0 /EDTA/air. Fe 0 dosage (0.05–0.8 g L −1 ) and EDTA dosage (0–8 mM) were optimized and the optimal dosage for Fe 0 and EDTA was 0.2 g L −1 and 2 mM, respectively. The degradation rate of SMT in pre-Fe 0 /EDTA/air system were 1.6–2.9 times at different initial pH (3–6) and 2.3–3.1 times in the presence of inorganic ions (SO 4 2− , Cl − and HCO 3 − ) and natural organic matter (NOM) compared with Fe 0 /EDTA/air system. Decrease of Fe 0 contact angle in the presence of magnetization and EDTA enhanced the corrosion rate of Fe 0 . Accordingly, pre-Fe 0 /EDTA/air system would be a cost-effective and promising eco-friendly alternative for removal of SMT.
研究领域:
环境科学
·
水处理技术
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 11
·1532
·
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
·
材料科学
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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）