Analytical Methods
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2017
·Vol. 9
·期 17
·2553-2560
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IF 1.9
Lei Meng,Yaqing Yuan,Guang Pu,Na Xu
Highly blue luminescent and water-soluble silicon nanoparticles (Si NPs) are prepared by an efficient one-pot hydrothermal route from (3-aminopropyl) trimethoxysilane and ascorbic acid at 160 °C. The label-free Si NPs are demonstrated as an effective fluorescent probe for selective recognition of Mn2+. The linear range is from 2.5 to 250 μM and the detection limit is calculated to be 1.1 μM due to Mn2+ induced Si NP aggregation (turn-off). Additionally, the quenched fluorescence can be restored in the presence of EDTA because the EDTA can grab Mn2+ from the aggregated Si NPs–Mn2+ system owing to its strong chelating ability (turn-on). This sensing system based on the “on–off–on” fluorescence switching method can facilitate further development in Mn2+ detection.
研究领域:
分析化学
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纳米材料科学
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环境监测
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Wei Zhang,Qiao Li,Rui Li,Nan Shen,Jiansheng Li,Jinyou Shen,Xiuyun Sun,Weiqing Han
Industrial wastewater containing organic ligands and heavy metals is considered a serious public health threat, and its treatment and purification have become challenging tasks. Moreover, the organic-chelated heavy metals formed by common organic ligands and free heavy metals can cause many problems and concerns because of their poor biodegradability, high solubility, and extreme stability. In this study, aluminum-containing ferrihydrite (Fh-Al) adsorbents of different composition molar ratios were prepared and utilized to remove typical EDTA-Cr(III) in an aqueous system, and the associated removal mechanism was examined. The experimental results show that adding Al not only enhances the removal rate of EDTA-Cr(III) by the Fh-Al adsorbent in a wide pH range (pH = 3–9) but also increases the maximum adsorption capacity of EDTA-Cr(III). In addition, the specific surface area of Fh-Al can be increased by adding aluminum with different molar ratios, thus promoting its adsorption performance for EDTA-Cr(III). Furthermore, surface complexation and electrostatic attraction were proposed as possible mechanisms of EDTA-Cr(III) adsorption by Fh-Al. This study shows that Fh-Al-6 adsorbent can adsorb common EDTA-chelated heavy metals (such as EDTA-Pb, EDTA-Cr, EDTA-Cu and EDTA-Cd) in one step, with maximum adsorption capacities of 41.47, 32.33, 16.51 and 31.27 mg/g at pH = 3. The Fh-Al-6 adsorbent can be reused after being regenerated in a 2 g/L Na 2 SO 4 solution. This study provides new expectations for treating wastewater containing organic groups and heavy metals.
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
APPLIED SURFACE SCIENCE
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2023
·
IF 6.7
Mingliang Zhu,Ruixia Yuan,Chijia Wang,Qinghe Gao,Huaiyuan Wang,Huijuan Qian
In this work, we designed and fabricated an anti-scaling and anti-corrosion superhydrophobic 1H,1H,2H,2H-perfluorodecyl triethoxysilane (PFDS)/ethylenediamine tetraacetic acid (EDTA)/anodized copper oxide (ACO) coating at the surface of a copper alloy. The water contact angle of PFDS/EDTA/ACO coating reaches 164.53°, showing superhydrophobicity, which will reduce the contact between scale crystals, corrosive medium and substrates, and help to inhibit scaling deposition and corrosion. Results show during the CaCO 3 deposition test, EDTA molecules, EDTA-Zn 2+ and EDTA-Cu 2+ chelates stored in the micro-structure of superhydrophobic PFDS/EDTA/ACO coating are released to the interface and help to improve scaling prevention. After soaking for 48 h, the CaCO 3 scaling mass of PFDS/EDTA/ACO coating was only 27.0 % that of ACO coating, and the corrosive protection efficiency of the superhydrophobic PFDS/EDTA/ACO coating was improved by 3.4 times that of ACO coating. Studies indicated that the anti-scaling and anti-corrosion of the superhydrophobic PFDS/EDTA/ACO coating contributes to the cooperation of superhydrophobic air film and the potential storage and dynamic release of EDTA, as well as the passivation layer formed on the substrate.
研究领域:
材料科学
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表面工程
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腐蚀与防护
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高影响因子
Journal of Energy Chemistry
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2023
·
IF 13.1
Yangeng Li,Yan Kou,Keyan Sun,Jie Chen,Chengxin Deng,Chaohe Fang,Quan Shi
Phase change materials (PCMs) have attracted much attention in the field of solar thermal utilization recently, due to their outstanding thermal energy storage performance. However, PCMs usually release their stored latent heat spontaneously as the temperature below the phase transition temperature, rendering thermal energy storage and release uncontrollable, thus hindering their practical application in time and space. Herein, we developed erythritol/sodium carboxymethylcellulose/tetrasodium ethylenediaminetetraacetate (ERY/CMC/EDTA-4Na) composite PCMs with novel spatiotemporal thermal energy storage properties, defined as spatiotemporal PCMs (STPCMs), which exhibit the capacity of thermal energy long-term storage and controllable release. Our results show that the composite PCMs are unable to lose latent heat due to spontaneous crystallization during cooling, but can controllably release thermal energy through cold crystallization during reheating. The cold-crystallization temperature and enthalpy of composite PCMs can be adjusted by proportional addition of EDTA-4Na to the composite. When the mass fractions of CMC and EDTA-4Na are both 10%, the composite PCMs can exhibit the optical cold-crystallization temperature of 51.7 °C and enthalpy of 178.1 J/g. The supercooled composite PCMs without latent heat release can be maintained at room temperature (10–25 °C) for up to more than two months, and subsequently the stored latent heat can be controllably released by means of thermal triggering or heterogeneous nucleation. Our findings provide novel insights into the design and construction of new PCMs with spatiotemporal performance of thermal energy long-term storage and controllable release, and consequently open a new door for the development of advanced solar thermal utilization techniques on the basis of STPCMs.
研究领域:
材料科学
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能源技术
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化学工程
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DOI
高影响因子
Journal of Water Process Engineering
·
2026
·
IF 6.6
Xinyu Tang,Liangquan Lu,Hua Zhang,Xiaojie Sun,Bin Dong,Mingxin Bin,Jianhong Bi,Pengfei Yang
A magnetic Fe 3 O 4 -EDTA@Zr-MOF composite was successfully synthesized and characterized. • The maximum adsorption capacity for chlortetracycline reached 268.10 mg/g. • The adsorbent retained around 80% removal efficiency after six regeneration cycles. The long-term accumulation and serious pollution of chlortetracycline in the environment have emerged as a global pollution concern, posing a serious threat to ecosystems and public health. To overcome the limitations of traditional adsorbents, including low adsorption capacity, poor selectivity and limited regenerative properties, this study synthesized a composite material Fe 3 O 4 -EDTA@Zr-MOF that combines magnetic separation and ligand functionality by the hydrothermal method for CTC adsorption. Successful synthesis was verified by structural characterization, including FTIR and XRD. The adsorption kinetics were well described by the PSO model, suggesting that active-site-controlled surface interactions played an important role in CTC uptake. Thermodynamic analysis showed ΔG 0 < 0 and ΔH 0 > 0, indicating a spontaneous and endothermic process. The adsorption isotherms fitted the Langmuir model well, with a maximum theoretical capacity (q max ) of 268.10 mg/g. Circulation experiments show that the adsorption capacity of the material was still around 80% after 6 cycles. Fe 3 O 4 -EDTA@Zr-MOF combines high adsorption efficiency with easy magnetic recovery and good reusability, providing a potential solution for the treatment of tetracycline antibiotics in aquatic environments. Download: Download high-res image (122KB) Download: Download full-size image
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高影响因子
ACS ES&T Water
·
2023
·
IF 5.3
Ming Liu,Hua Zou,Penghui Shao,Hao Jia,Guoshuai Liu
The presence of metals and complexing agents in wastewater poses serious threats to public health and aquatic ecosystems. Electrochemically advanced oxidation processes can break down heavy metal compounds, but recovering these metals at the cathode presents challenges. To address this concern, we explore amidoxime, known for its high complexation capacity and hydrophilicity, as a cathodic microenvironment modifier to enhance heavy metal adsorption and immobilization. We develop a novel carbon felt (CF) amidoxime-functionalized group (CFAG) cathode for cathodic nickel recovery from Ni–EDTA. Experimental results show a significant improvement in nickel recovery efficiency with amidoxime functionalization. Specifically, CFAG outperforms CF by 2 times, driven by nickel recovery reaction kinetic constants of 0.0202 min–1 for CFAG and 0.0101 min–1 for CF. Furthermore, cycling and desorption experimental results have validated the enduring stability and regenerative attributes of the CFAG electrode, and the density functional theory calculations confirm that nickel binds more effectively to amidoxime groups than conventional polymer groups on CF. This study presents a promising electrochemical approach for recycling metals in complex heavy metal wastewater, making metal resource recovery more economical and efficient.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wufeng Liu,Quanhua Xie,Tianlu Chen,Lu Ran,Zilin Nie,Yang Liu,Yuanyuan He,Haixing Chang,Najmeh Zare,Hassan Karimi-Maleh,Nianbing Zhong,Tejraj M. Aminabhavi
Photocatalytic optical hollow fibers (POHFs) coupled with spiral-shaped Cl − adsorption fibers are used to remove trichloroethylene (TCE) from wastewater. The POHFs are hollow quartz tubes coated with Ti 3 C 2 T x -doped oxygen vacancy (OV)-rich BiOBr (BiOBr-OV). The photocatalyst coating enhanced the excitation light intensity onto the photocatalytic fiber surface. The hetero-junction between Ti 3 C 2 T x and BiOBr-OV reduced the bandgap and broadened spectral absorption range of the composite photocatalyst. The material increased the production of reactive · O 2 - and •OH species, thereby improving the degradation of TCE. Spiral-shaped Cl − adsorption fibers comprised of polyethersulfone loaded with ethylenediaminetetraacetic acid-grafted metal–organic framework (MOF-808-EDTA). Tertiary amine groups (−R 3 N) of MOF-808-EDTA exhibited superior Cl − adsorption capabilities. As the Cl − ion indirectly quenches the free radicals, its removal reduced the inhibitory effect of the photocatalytic products, further enhancing the efficiency of TCE degradation and removing its degraded byproducts. TCE, chemical oxygen demand, and Cl − ion removal rates are 98.75, 69.15, and 99.22 %, respectively. Intimate coupling of photocatalysis and ion adsorption provided an effective solution for efficient removal of TCE, its degradation products, and Cl − ions from 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
Surfaces and Interfaces
·
2021
·
IF 4.837
Zhihua Zhu,Jianle Wang,Xueqiang Liu,Le Yuan,Xueming Liu,Hong Deng
The soil washing technology of heavy metals in soil has the prospect of practical application. In this study, we screening out the best washing conditions for remediation of heavy metal contaminated soil and the conclusions are verified by pilot-scale field tests. Compared with citric acid (CA) and ethylene diamine teraacetic acid disodium salt (EDTA), Iron-based compounds (IC) has highest removal rate of heavy metals in soil. Heavy metals are mainly concentrated in soil with small particle size. Comprehensive cost consideration, the best washing concentration is 0.06 mol·L −1 , the best solid liquid ratio is 1:5 and the best washing time is 30 min. CaO can precipitate heavy metals in washing waste liquor by increasing the pH of heavy metals in washing waste liquor, and the best precipitation time is 30 min considering the comprehensive cost. The results of pilot scale experiments show that the IC washing technology was shown to be an effective approach to rapidly reduce the Pb, Zn and As in contaminated soil.
研究领域:
环境科学
·
土壤修复
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Jie Wang,Guanshun Xie,Senlin Zhang,Guohao Li,Zhaohui Huang,Xiaohui Li,Xiuqiang Xie,Nan Zhang
Although MXenes have attracted significant attention across diverse fields, they exhibit a pronounced susceptibility to oxidation in aqueous environments, with oxidation significantly accelerated in the presence of transition metal ions (TMI) such as Fe 3+ and Cu 2+ . This limitation impedes the synthesis of transition metal compounds/MXene-based composites and their potential for functional applications. In this study, we elucidate the mechanism of accelerated oxidation of Ti 3 C 2 T x is that Fe 3+ promotes the electron loss in Ti 3 C 2 T x , thus leading to an increased production of hydroxyl radicals ( OH) to oxidize Ti 3 C 2 T x . Furthermore, a rational two-in-one strategy is provided with adding electron-rich ethylenediaminetetraacetic acid disodium zinc salt (ZnNa 2 EDTA) to enhance the stability of Ti 3 C 2 T x by defect filling and electron donation. Consequently, the production of OH is significantly reduced and thus Ti 3 C 2 T x remains well-preserved in the presence of Fe 3+ , which has also effectively enhanced the oxidation stability of Ti 3 C 2 T x in the presence of Cu 2+ . This work is expected to pave a new pathway for targeted applications with coexisting Ti 3 C 2 T x and TMI.
研究领域:
材料科学
·
化学
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DOI
PubMed
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 6
·065405
·
IF 1.449
Qinghong You,Miaomiao Wan,Xiaoxu Fang,Xiulian Yin,Chuping Luo,Xuejuan Zhang
The process of intermittent microwave extraction (IME) pectin from pomelo peels assisted with EDTA was optimized by response surface methodology. Results showed that the optimal process for intermittent microwave extraction of pectin was as follows: 0.25% EDTA, pH 1.0, solid-to-liquid ratio 1:25 g ml−1, extraction time 125 s, microwave power 550 W, the extraction yield of pomelo peels was (38.48 ± 0.28)%. The structure of three kinds of pectin was verified by IR, SEM, XRD, HPLC and the results showed that pectin obtained from IME had a poor solubility but a good emulsifying activity. The IUEP had the highest scavenging rates of DPPH radicals.
研究领域:
食品科学
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生物化学
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高影响因子
MICROCHIMICA ACTA
·
2014
·Vol. 182
·期 5
·909-915
·
IF 3.719
Zhong Yaping,Zhu Jingjing,Wang Qingpu,He Yu,Ge Yili,Song Congwu
We show that copper nanoclusters coated with bovine serum albumin are viable probes for fluorometric determination of Cu(II) ion. The effect is attributed to the paramagnetic nature of Cu(II) bound to BSA. The ions Hg(II) and Fe(III) also give a strong effect but can be discerned by addition of EDTA. The probe can be regenerated by adding an excess of EDTA. The method is capable of detecting Cu(II) in the 0.02–34 μM, and the limit of detection is 1nM. The method was applied to the determination of Cu(II) in spiked water samples. It is rapid, simple, and fairly sensitive. The method may also be applied to detect Hg(II) and Fe(III) if Cu(II) is absent.
BSA-coated copper nanoclusters (NCs) are added to the sample, and EDTA is then added to block potentially interfering ions. The fluorescence of the NCs increases with increasing concentration of Cu(II) ions being present.
研究领域:
分析化学
·
生物化学
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2017
·
IF 3.615
Yu Liu,Zimo Lou,Yue Sun,Xiaoxin Zhou,Shams Ali Baig,Xinhua Xu
In this study, SiO 2 -EDTA was prepared by silanization reaction between N-(trimethoxysilylpropyl) ethylenediamine triacetic acid, trisodium salt (EDTA-silane) and hydroxyl groups for enhanced removal of Pb(II), Pb(II)-Cit (the clathrate generated by Pb(II) and trisodium citrate dehydrate(Cit)) and Pb(II)-EDTA(20%) from aqueous solutions. SiO 2 -EDTA composites were characterized using SEM, TEM, EDX-mapping, FTIR, XPS and TGA analyses. The influence of solution pH, initial concentration, contact time and co-existing interferents were also studied. Results demonstrated that the composite successfully adsorbed 147.52, 107.65 and 124.18 mg g −1 of Pb(II), Pb(II)-Cit, and Pb(II)-EDTA (20%), respectively with the initial Pb(II) concentration of 100 mg L −1 . Kinetics study revealed that the adsorption rate was significantly high at the beginning and then reached to equilibrium within 1.0 h. Moreover, Pb(II) adsorption capacities were found to considerably affected by co-existing cations and not inhibited by natural organic matter (NOM). Characterization analyses confirmed that EDTA was successfully assembled on SiO 2 which had been used as a supporting matrix due to its huge specific surface area. Findings from this study suggested that the present composite could be considered as a promising adsorbent for large scale treatment of wastewater containing elevated Pb(II) concentration.
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
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