CHEMICAL ENGINEERING SCIENCE
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2024
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IF 4.1
Chunlong Qiu,Yuzhu Sun,Xiaohu Lei,Xingfu Song
For the efficient utilization of industrial waste gypsum resources, their conversion into α-type calcium sulfate hemihydrate represents a feasible approach. Notably, the post-hydration mechanical properties of α-calcium sulfate hemihydrate considerably depend on its morphology and size. This study attempted to control the morphology of α-calcium sulfate hemihydrate using ethylenediaminetetraacetic acid disodium salt (EDTA-2Na). Experimental and simulation analyses (DFT and MD) were conducted to elucidate the action mechanism of EDTA on the crystal morphology of calcium sulfate hemihydrate. Furthermore, its effects on the mechanical properties of calcium sulfate hemihydrate after hydration were explored. It was found that the length to diameter ratio of calcium sulphate hemihydrate decreased from 5.47 to 1.9 with increasing addition and the strength of the hydrated blocks increased from 32.1 MPa to 47.95 MPa. The results revealed that EDTA effectively transformed the morphology of α-calcium sulfate hemihydrate from acicular whiskers to short columnar crystals, and the EDTA molecules chemisorbed onto the surfaces of α-calcium sulfate hemihydrate, stabilizing their adsorption and thereby regulating the crystal morphology. The findings of this study can aid in the efficient utilization of industrial waste gypsum resources and in mitigating pollution caused by them.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Haoran Song,Longyu Chen,Yi hang Xu,Chen Li,Xuewei Hu,Yingjie Li,Shugen Liu,Jianhong Huang,Qun Zhao,Jie Li,Senlin Tian
Activation of peroxymonosulfate (PMS) by MXene-supported Co 3 Ti and single-atom Co catalyst (Co@MXene) achieved the efficient decomplexation of lead-ethylenediaminetetraacetic acid (Pb-EDTA) and the recovery of lead (Pb) over the pH range of 3.0–9.0. The removal efficiency of Pb-EDTA reached up to 93.6 % within 30 min and total Pb was completely removed within 15 min. The coordination structure differences between Co 3 Ti and single-atom Co induced their various electron transfer pathways with PMS, in which Co 3 Ti brought key effect to the generation of Co (Ⅳ), while single-atom Co and regenerative Co (II) were responsible for the generation of HO and SO 4 − and 1 O 2 , More importantly, the oxygen transfer reaction from O-Co 3 Ti to Co 3 Ti-O and the reducibility of MXene triggered the regeneration of low-valent Co. This study proposed a novel mechanism of Co (Ⅳ) generation and low-valent Co regeneration, which improved the understanding of the electron transfer pathways of Co@MXene/PMS oxidation process.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Linqing Liang,Jiahong Wang,Yanxin Zhang
In this study, H 2 O 2 oxidized magnetic mesoporous carbon hollow microspheres (Fe 3 O 4 @void@C@H 2 O 2 ) with core-shell structure, high magnetic properties and abundant oxygen-containing functional groups was synthesized for removal of Cr(III)-EDTA and Cr(III) in high salinity wastewater. Fe 3 O 4 @void@C@H 2 O 2 was synthesized at optimum conditions of H 2 O 2 concentration of 20%, oxidation temperature of 40 °C and oxidation time of 4 h, and the determined adsorption amount of Cr(III)-EDTA and Cr(III) on the adsorbent was 9.72 and 10.53 mg g −1 at pH 4.0 and 25 °C, respectively. Adsorption behavior of Cr(III)-EDTA could be better described by Langmuir isotherm and Cr(III) adsorption followed Freundlich isotherm. Cr(III)-EDTA and Cr(III) adsorption on the adsorbent followed pseudo-second-order kinetics, and adsorption rate of Cr(III) adsorption on the adsorbent is higher than that of Cr(III)-EDTA. Fe 3 O 4 @void@C@H 2 O 2 showed strong affinity for Cr(III) and Cr(III)-EDTA even in high salinity water. Moreover, Fe 3 O 4 @void@C@H 2 O 2 exhibited the high stability in acid solution and Cr(III) saturated adsorbent can be easily regenerated in 0.1 mol L −1 HCl. Cr(III)-EDTA adsorption was described to the surface complexation between the oxygen-containing groups (such as hydroxyl, carbonyl and carboxyl groups) of the adsorbent and Cr(III) in Cr(III)-EDTA, and the hydrogen bonding between oxygen-containing groups of the adsorbent and EDTA of Cr(III)-EDTA, while Cr(III) adsorption on the adsorbent was surface complexation and ion exchange. The results highlighted that Fe 3 O 4 @void@C@H 2 O 2 have great potentials for adsorptive removal of Cr(III) and it's chelate from the high salinity wastewater.
研究领域:
环境科学
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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
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2024
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IF 4.9
Zhanjian Liu,Linfeng Zhu,Shengdi Qu,Xuelin Liu,Xiguang Zhang,Meiling Li,Jing Jing,Huaiyuan Wang
Scaling is an ineluctable challenge facing humanity in industrial production. Although superhydrophobic coatings have been proven to possess anti-scaling effects, they are generally limited by fragile mechanochemical durability. Herein, a thermoplastic polyurethane (TPU)/polyvinylidene fluoride (PVDF)/microcapsules (MCs)/nanocarbon fiber (CNF) composite coating with superhydrophobicity (water contact angle of 155°) and superoleophilicity (oil contact angle of 0°) has been successfully prepared by spraying method. The scale inhibitor of EDTA-Zn was encapsulated in polyurea@SiO 2 shell via Pickering emulsion polymerization route. Owing to the sustained release of EDTA-Zn and the shielding oil layer formed by capturing oil molecules, the prepared coating is capable of inhibiting the adhesion of CaCO 3 scale nucleation and inducing the growth of aragonite CaCO 3 scale, which is more likely to detach from the coating surface compared to calcite . Thus, in simulated oil field production fluid, the prepared coating demonstrated excellent anti-scaling property with an extremely low CaCO 3 deposited weight of 0.072 mg/cm 2 . Simultaneously, because of the stable shielding oil film on the coating surface , the prepared coating exhibited excellent corrosion resistance , with a low I corr of 7.39 × 10 −9 A/cm 2 and a corrosion rate of 8.06 × 10 −5 mm/year. In addition, the prepared coating also shown excellent mechanical durability, anti-fouling and self-cleaning qualities. We anticipate that our work will offer a new approach to the development and production of industrial anti-scaling and anti-corrosion coatings.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Environmental Science-Processes & Impacts
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2021
·Vol. 23
·期 5
·735-744
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IF 4.238
Yanghui Xiong,Yuan-Bo Wang,De-Sheng Pei
There are two popular methods to measure reactive phosphorus (P) and total P: the GB11893-89 method in China and the 4500-P E method of the APHA in the US. However, their drawbacks, including long reaction time and narrow linear range, cannot satisfy the demand for modern analytic techniques. Here, based on reducing the acidity of the molybdenum blue (MB) reaction, and then stabilizing with EDTA, we have developed a novel method (WH-flags) to quickly measure both reactive P and total P. In the WH-flags method, “W” stands for Wide linear ranges (0–1.4 mg L−1 for reactive P & 0–1.8 mg L−1 for total P), “H” stands for High tolerance of different matrices (it can be adapted to a wide spectrum of samples), “f” is fast reaction time (2 min), “l” is long stabilization (40 min), “a” stands for appropriate recovery rates (89.1–103.2%), “g” is good precision and accuracy (CVs < 5% & Res < 5%) and “s” is small volume of samples (5–10 mL). The WH-flags method showed good linearity (R2 > 0.999). The WH-flags method should have broad application in monitoring P from different aqueous samples in the future.
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 132
·期 32
·
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 SCIENCE AND POLLUTION RESEARCH
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2019
·Vol. 26
·期 36
·36933-36941
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IF 2.914
Chen Jun,He Jinjia,Wang Xiaoping,Hrynsphan Dzmitry,Wu Jiali,Chen Jianmeng,Yao Jiachao
Conversion of Fe II (EDTA)-NO or Fe III (EDTA) into Fe II (EDTA) is a key process in a wet flue gas denitrification technology with Fe II (EDTA) solution. In this work, the stoichiometry, kinetics, and thermodynamics of Fe II (EDTA)-NO reduction by Mn powder were investigated. We first studied the Fe II (EDTA)-NO reduction and product distribution to speculate a possible stoichiometry of Fe II (EDTA)-NO reduction by Mn powder. Then, the effects of major influencing factors, such as pH value, temperature, and Mn concentration, were studied. The pseudo-second-order model was established to describe the Fe II (EDTA)-NO reduction. Simultaneously, according to Arrhenius and Eyring-Polanyi equations, the reaction activation energy ( E a ), enthalpy of activation (∆ H ‡ ), and entropy of activation (∆ S ‡ ) were calculated as 23.68 kJ/mol, 21.148 kJ/mol, and − 149.728 J/(k mol), respectively. Additionally, simultaneous reduction of Fe III (EDTA) and Fe II (EDTA)-NO was investigated to better study the mechanism of Fe II (EDTA) regeneration, suggesting that there was a competition between the two reduction processes. Finally, a simple schematic mechanism of NO absorption by Fe II (EDTA) combined with regeneration of manganese ion and ammonium was proposed. These fundamental researches could offer a valuable guidance for wet flue gas denitrification technology with Fe II (EDTA) solution.
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
ELECTROCHIMICA ACTA
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2018
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IF 5.116
Yue Song,Tianran Sun,Long Cang,Song Wu,Dongmei Zhou
Further research into more cost-effective methods to treat toxic metal-ethylenediaminetetraacetate (Me-EDTA) complexes is required due to their high bioavailability. In this study, we compared electrodialysis (ED) with different compartment designs (2-, 3- and 4-compartment designs) and electrochemical oxidation (EO, 1-compartment design) to treat a dilute Cu(II)-EDTA solution (1 mM). After a 48-h treatment with a constant current applied at 32 mA, the Cu removal efficiencies were achieved at 49%, 87%, 79% and 96% for 1-compartment EO and 2- to 4-compartment ED, respectively, and the total organic carbon concentrations decreased from 138 mg/L to 100, 64, 57 and 39 mg/L, respectively. The energy consumptions for 1-compartment EO and 2- to 4-compartment ED were 7.7, 8.4, 13.9 and 15.4 W h, respectively. Based on all above results, the most cost-effective design was determined to be the 2-compartment ED. Moreover, the 3- and 4-compartment ED treatments have faster contaminant removal kinetics than 1-compartment EO and 2-compartment ED. This study clarified the mechanisms of the migration and the transformation of Cu-EDTA during EO and ED with different membrane combinations, which is helpful for improved selection of compartment design for metal-chelate complex removal.
研究领域:
环境科学
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化学工程
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高影响因子
FOOD CHEMISTRY
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2018
·
IF 4.946
Nan Wang,Huijuan Chai,Xuelin Dong,Qian Zhou,Lihua Zhu
Iron(III) ethylenediaminetetraacetate (Fe(III)EDTA) is widely used in iron fortification for reducing iron deficiency, and its determination is urgently needed. The present work developed a fluorescent method to straightforwardly determine Fe(III)EDTA by using photoluminescent carbon dots (C-dots) with the aid of F − ions as the masking agent of free Fe 3+ ions. In the presence of F − ions, only Fe(III)EDTA selectively quenched the photoluminescence of C-dots, and both Fe 3+ and Fe 2+ as well as other carboxylic acids have no effect on the emission of C-dots. The sensing mechanism was attributed to the ligand-tailored electron transfer process from C-dots to Fe 3+ . Under optimum conditions, this method showed a linear calibration plot over the Fe(III)EDTA range of 1.0–200 μmol L −1 and a detection limit of 0.4 μmol L −1 . The proposed method was successfully applied to determine Fe(III)EDTA in real samples with acceptable recoveries of spikes (95%−110%) and repeatability (RSD, 4.2%−9.5%).
研究领域:
分析化学
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食品科学
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DOI
PubMed
高影响因子
Journal of Analytical Methods in Chemistry
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2022
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IF 2.594
Chao Li,Linna Duan,Mingchao Han,Hongwei He,Mengxiang Yuan,Hairong Wang
The determination of trace metals in seawater is an important project of marine environmental monitoring. However, the presence of many alkali metal ions with high concentration, such as sodium ion, seriously interferes with the detection limit and accuracy of atomic absorption spectrometry (AAS, flame/graphite furnace integrated). The conventional chemical methods for the enrichment of trace metals are complex, and low boiling point organic solvents are used. In this paper, a kind of commercial cross-linked polystyrene resin microspheres was chloromethylated and aminated to introduce EDTA-type amino polycarboxylic groups and then loaded in a column as the absorption filler. A set of seawater pretreatment and enrichment devices was designed and assembled. The enriching process and conditions of trace Cu, Zn, Pb, and Cd in standard seawater were studied. 10 g of the modified resin could enrich the equivalent seawater and remove successfully the light metal ions. pH = 5∼9 and 0.2 mL/min of the flow rate were the suitable conditions for preconcentration. The enriched metal ions in the eluent were analyzed on the AAS. Compared with the conventional solvent method, the novel material and enrichment device have high preconcentration efficiency, strong anti-interference ability, and low cost and could be directly applied for routine seawater detection.
研究领域:
分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
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
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DOI
高影响因子
Journal of CO2 Utilization
·
2020
·
IF 5.993
Chengyi Dai,Xiao Zhao,Borui Hu,Xinbao Zhang,Qunxing Luo,Xinwen Guo,Xiaoxun Ma
Capturing and utilization of carbon dioxide (CO 2 ) not only leads to effective use of carbon resources, but also alleviates environmental pollution caused by increasing concentration of CO 2 , thus making it a hot research topic in recent years. In this study, a series of highly dispersed iron-cobalt (Fe-Co) catalysts was prepared by ethylenediaminetetraacetic acid disodium salt (EDTA-2Na) modification, which could efficiently convert CO 2 into high value-added chemicals (C 2 -C 4 = and C 5 -C 11 ). X-ray diffraction (XRD) analysis showed that the addition of a small amount of Co and EDTA-2Na contributed to enhance the sintering resistance of Fe species. During the calcination process, EDTA 4− can be decomposed into small organic molecules with reducibility, thus promoting the reduction of iron species. The CO temperature-programmed desorption (CO-TPD) results showed that cobalt enhanced the adsorption and activation of intermediate CO on Na x Fe-Co catalyst, thereby promoting the catalytic conversion of CO 2 . The complexation of EDTA promotes the synergistic effect of Fe-Co bimetals, enhances the chemical adsorption of CO 2 . Sodium in EDTA-2Na promotes the surface basicity of the catalysts, which is favored for improving the product distribution of hydrocarbons. At lower H 2 /CO 2 (1/1) ratio, the EDTA-2Na modified Fe-Co/Al 2 O 3 catalyst exhibited high conversion of CO 2 (32.8 %) and excellent selectivity toward high value-added chemicals. The selectivity of by-product CO was only 8.1 %; and C 2 -C 4 = (32.5 %) and C 5 -C 11 (46.3 %) accounted for ∼79 % selectivity among the hydrocarbons generated.
研究领域:
催化化学
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环境科学
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材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）