WATER SCIENCE AND TECHNOLOGY
·
2024
·Vol. 89
·期 3
·811-822
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IF 2.5
Ma Yang,Ma Yongwen,Wan Jinquan,Wang Yan,Ye Gang,Zhang Zhifei,Lin Yining
View large Download slide View large Download slide Close modal Advanced oxidation technologies based on hydroxyl radical (•OH) and sulfate radical (SO 4 −• ) are two common types of advanced oxidation technologies, but there are not many reports on the application of advanced oxidation methods in actual wastewater pretreatment. This article compares the pre-treatment performance of Fe 2+ /H 2 O 2 and Fe 2+ /Persulfate systems in actual pharmaceutical wastewater, and combines EEM, GC-MS, and toxicity testing results to explore the differences in TOC, COD, and NH 3 -N removal rates, optimal catalyst dosage, applicable pH range, toxicity of effluent after reaction, and pollutant structure between the two systems. The results indicate that the Fe 2+ /H 2 O 2 system has a higher pollutant removal rate (TOC: 71.9%, COD: 66.9%, NH 3 -N: 34.1%), but also requires a higher catalyst (Fe 2+ ) concentration (6.0 g/L), and its effluent exhibits characteristic peaks of aromatic proteins. The Fe 2+ /Persulfate system has a wider pH range (pH ≈ 3-7) and is more advantageous in treating wastewater containing more cyclic organic compounds, but the effluent contains some sulfur-containing compounds. In addition, toxicity tests have shown that the toxicity reduction effect of the Fe 2+ /Persulfate system is stronger than that of the Fe 2+ /H 2 O 2 system. Two types of advanced oxidation systems were compared using actual pharmaceutical wastewater as the research object. Investigated the pretreatment effect of advanced oxidation systems and explored the possibility of applying advanced oxidation to the pretreatment process of wastewater. A deeper comparison was made between the two advanced oxidation methods by comparing the EEM and GC–MS results.
研究领域:
环境科学
·
废水处理工程
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DOI
PubMed
高影响因子
Food Bioscience
·
2024
·
IF 4.8
Shanting Lin,Xiao Hu,Shengjun Chen,Hui Huang,Xiaoshan Long,Zhenxing Li
The aims of this study were to investigate the effect of precise phosphorylation of Ser in GL-Hyp-GPSGEEGKR on its Fe 2+ chelating capacity, and the effects and mechanisms of folic acid coupling to GL-Hyp-GPS (PO4) GEEGKR on its resistance against degradation by gastrointestinal enzymes. The results demonstrated that GL-Hyp-GPS (PO4) GEEGKR exhibited significantly enhanced Fe 2+ chelating capability compared to GL-Hyp-GPSGEEGKR. This was attributed to the phosphorylation of Ser introducing more Fe 2+ chelating sites. Furthermore, the results of UV–Vis, FTIR, and 1 H NMR showed that folic acid has successfully coupled with GL-Hyp-GPS (PO4) GEEGKR to generate folic acid-GL-Hyp-GPS (PO4) GEEGKR. Folic acid-GL-Hyp-GPS (PO4) GEEGKR demonstrated superior resistance against degradation by gastrointestinal enzymes. This may be attributed to the coupling of folic acid altering the original zeta potential of the peptide and the steric hindrance effect of folic acid hindering the interaction between enzymes and peptide. These findings can provide valuable insights for the production of high Fe 2+ chelating peptides that resist gastrointestinal enzyme degradation.
研究领域:
生物化学
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药学
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营养科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yeshuang Wang,Mingxian Duan,Zhelin Su,Chao Yang,Bingning Wang,Jiawei Kou,Huiling Fan
The abundant Fe 3+ Lewis acidic sites and well-developed pore structure endow the Fe-MOFs with great potential for H 2 S catalytic oxidation at room temperature, but their performance is inferior owing to the insufficient redox ability of the Fe 3+ species inherent in frameworks. Herein, an effective protocol was proposed for the first time to remarkably improve the catalytic oxidation performance of MIL-100(Fe) under ambient conditions through the introduction of Fe 2+ coordinatively unsaturated site (CUS) species into the framework. As expected, the sample after modification had a superior H 2 S breakthrough capacity of 267.3 mg S/g, an 18.4-fold increase compared with that without Fe 2+ CUS (14.5 mg S/g). The introduced Fe 2+ species triggered the Fe 3+ /Fe 2+ redox cycle for H 2 S catalytic oxidation by enhancing the oxidative ability of the Fe 3+ CUS intrinsic to the framework. Moreover, the Fe 2+ CUS was also found act as an active site for O 2 activation into O 2 ∙– , which not only provides an additional pathway for H 2 S catalytic oxidation but also accelerates the redox cycling of Fe 3+ /Fe 2+ during the catalytic oxidation process. On the basis of the experimental findings, a plausible catalytic mechanism involving mixed-valence iron sites in MIL-100(Fe) was proposed.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Changxin Huangfu,Yu Zhang,Minseok Jang,Liang Feng
Cu 2+ , Fe 2+ and free chlorine are three important analytes in drinking water. Firstly, the μPAD for single analyte was easily fabricated. Detection limits for Cu 2+ , Fe 2+ and free chlorine were 0.1 mg L −1 , 0.1 mg L −1 and 0.2 mg L −1 , respectively, less or equal to each Chinese Drinking Water Standard concentration and lower than those of most commercially available testing strips. Another μPAD with two layers was then developed to monitor and report the safety level of these three analytes in drinking water simultaneously. Moreover, the μPADs for Fe 2+ and free chlorine provided more distinguishable colors to users with naked eyes. The as-fabricated μPAD not only demonstrated excellent anti-interference capability, production reproducibility, but also exhibited good applicability for real use in different kinds of drinking water.
研究领域:
环境科学
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分析化学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 32
·49267-49278
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IF 5.19
Peng Huan,Chen Rong,Tao Ningyao,Xiao Yangyi,Li Chenxing,Zhang Tuqiao,Ye Miaomiao
Activation of peroxymonosulfate (PMS) by Fe 2+ is a green oxidation process for degradation of organic contaminants. However, the formation of iron mud and low PMS utilization lead to the decreased oxidation efficiency. In this work, commercial MoS 2 particles were used as the catalyst for boosting the Fe 2+ /PMS process for carbamazepine (CBZ) removal. The CBZ removal efficiency by the MoS 2 /Fe 2+ /PMS process was significantly enhanced, increasing to 6.5 times that of the Fe 2+ /PMS process. The Fe 3+ was reduced to Fe 2+ by the exposed Mo 4+ on the surface of MoS 2 , leading to the enhanced PMS utilization rate and increased Fe 2+ concentration. The relative intensity of DMPO-HO• and DMPO- SO 4 – • followed the order of MoS 2 /PMS < Fe 2+ /PMS < MoS 2 /Fe 2+ /PMS, also suggesting the enhanced oxidation activity with the addition of MoS 2 in the process of Fe 2+ /PMS. The commercial MoS 2 had good stability shown by the CBZ removal efficiency remaining almost unchanged during 8-time cycling use. Finally, a possible CBZ degradation pathway was proposed for helping understand the oxidation mechanism of the MoS 2 /Fe 2+ /PMS process.
研究领域:
环境科学
·
化学
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产品关联
DOI
PubMed
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2017
·Vol. 96
·期 1
·27-32
·
IF 1.356
Haiqian Zhao,Xingcun Gao,Chenghao Liu,Zhonghua Wang,Hanbing Qi
Basic rules of NO oxidation by a Fe 2+ /H 2 O 2 /AA directional decomposition system were researched based on the technical background of flue gas NO x removal. Effects of gas-liquid interfacial area, main gas, and solution parameters on NO oxidation efficiency ( η ) were analyzed. The results showed that adequate contact area was the precondition for high η by a Fe 2+ /H 2 O 2 /AA system. η decreased with the increase in NO concentration, which illustrated that this method would be efficient in oxidizing NO at a low concentration. η tended to decrease linearly with the growth in gas flow, however, the NO oxidation rate ( v ) rose with the increase in NO concentration and gas flow. η increased with the initial concentrations of H 2 O 2 and Fe 2+ , but the amplitude decreased. Controlling the initial concentrations of H 2 O 2 and Fe 2+ to achieve reasonable synergies between generation rate and consumption rate of ·OH could weaken the invalid consumption of reactants. η increased with the increase in temperature in the range 30–60 °C, but it nearly did not change with temperature after 60 °C. This oxidation technology and the traditional wet flue gas desulphurization technology exhibited temperature synergy. Under typical pH of wet desulphurization, η and H 2 O 2 consumption rate did not change obviously.
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
CELLULOSE
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2022
·Vol. 30
·期 2
·933-951
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IF 6.123
Yun Lin,Cheng Xinjian
Abstract As the plentiful and easily accessible natural polymer, cellulose is insoluble in most organic solvents. Improving the solubility of cellulose is necessary. In this work, cellulose-based fluorescent probes were prepared by chemical modification, and they could be dissolved in organic-water mixed solvent. The obtained cellulose based fluorescent probes could selectively recognize Fe 2+ in H 2 O/DMSO (1:2, v/v) or H 2 O/DMF (1:2, v/v) system. Firstly, through the esterification reaction between −OH on cellulose and acryloyl chloride, cellulose derivatives with −C = C were prepared. Secondly, via thiol-ene click reaction between −C = C on cellulose and −SH on cysteamine, −NH 2 groups at the chain ends are attached to cellulose. At the same time, three small molecular derivatives (N1, N2, N3) from 4-bromo-1,8-naphthalene anhydride were synthesized. Finally, the reaction between –NH 2 on cellulose and –CO–O–CO– on 4-bromo-1,8-naphthalene anhydride derivatives occurred readily. By this method, three cellulose-based fluorescent probes (CN1, CN2, CN3) were prepared successfully. These as-prepared fluorescent probes could be easily dissolved in H 2 O/DMSO or H 2 O/DMF mixed solvents. Fluorescence detection measurements indicate that the probes could selectively detect Fe 2+ . The fluorescence is quenched after the probes contacting with Fe 2+ , which are turn-off fluorescent probes. In addition, the prepared probes could be fabricated into cellulose membrane by a simple method for portable detection of Fe 2+ . The prepared cellulose-based fluorescent probes could be used as macromolecular sensors for Fe 2+ detection, and could be processed into cellulose-friendly materials, which are expected to be used in environmental systems. Graphical abstract
研究领域:
材料科学
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分析化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Shixiang Wang,Hongbin Wang,Yiqing Liu,Yongsheng Fu
Peracetic acid (PAA), a green disinfectant, has been widely used in the wastewater treatment. Here, a novel heterogeneous advanced oxidation process (Fe 2+ -zeolite/PAA) capable of generating hydroxyl radical was developed to remove sulfamethoxazole (SMX) from the contaminated water. The influences of various operational parameters including the initial pH, dosages of PAA and Fe 2+ -zeolite and water matrix on the removal of SMX were investigated. The complete removal of SMX occurred at mild pH condition (around 7.0) within 50 min. With the increase in PAA concentration or Fe 2+ -zeolite dosage, the degradation of SMX both enhanced. Presence of metal cations, inorganic anions and natural organic matter in the reaction system had a different degree of influence on SMX degradation. Based on the radical scavenging experiment, hydroxyl radical was proved to be mainly responsible for SMX oxidation. The degradation mechanism of SMX by Fe 2+ -zeolite/PAA was tentatively proposed showing three different reaction pathways including hydroxylation, nitrosation and bond cleavage according to the detected transformation products.
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
MICROCHIMICA ACTA
·
2022
·Vol. 190
·期 1
·1-12
·
IF 6.408
Yan Zhengquan,Zheng Xiaoyu,Meng Guoqing,Tang Yulian,Zhou Xuemei,Hao Junkai,Feng Jing,Lin Naibo,Hu Lei
A portable sensor for visual monitoring of Fe 2+ and H 2 O 2 , two-dimensional Co 3 O 4 modified by nano-IrO 2 (IrO 2 @2D Co 3 O 4 ) was prepared in this work, for the first time, with the help of microwave radiation at 140 °C, which was further stabilized onto common test strips. The present IrO 2 @2D Co 3 O 4 possessed superior dual-function enzyme-like activity with low toxicity and excellent biocompatibility. Especially, trace Fe 2+ and H 2 O 2 could exclusively alter their enzyme-like catalytic activity with discriminating hyperchromic or hypochromic effect, i.e., from blue to colorless or to dark blue for both IrO 2 @2D Co 3 O 4 dispersion and its functionalized test strips. The linear regression equations were A 652 = 0.5940 − 0.00041 c Fe 2+ (10 −8 M, R 2 = 0.9927) for Fe 2+ and ∆A 652 = 0.0023 c H2O2 + 0.00025 (10 −7 M, R 2 = 0.9982) for H 2 O 2 , respectively. When applied to visual monitoring of aqueous Fe 2+ and intercellular H 2 O 2 , the recoveries were 101.2 ~ 102.5% and 95.8 ~ 103.7% with detection limits of 1.25 × 10 −8 mol/L and 1.02 × 10 −7 mol/L, respectively, far below the permitted values in drinking water set by the World Health Organization. The mechanisms for the enhancing enzyme-mimetic activity of IrO 2 @2D Co 3 O 4 and its selective responses to Fe 2+ and H 2 O 2 were investigated in detail. Graphical Abstract
研究领域:
分析化学
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生物医学工程
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环境科学
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DOI
PubMed
高影响因子
POLYMER
·
2022
·
IF 4.432
Zhefu Wu,Jie Yang,Zhimei Wei,Qing Su,Shushan Yuan,Xiaojun Wang,Shengru Long,Suilin Liu,Gang Zhang
Quick detection of iron corrosion and scrap metal adsorption, two major threats to human lives and social prosperity, have aroused rising research attention. In this study, an in-situ Fe 2+ indication and adsorption nanofibrous membrane were prepared taking advantage of electrospun technology. Thanks to the synergistic effect of physical and chemical adsorption , a high Fe 2+ adsorption capacity of 218.11 mg/g was achieved, which was verified by scanning electron microscope and simulation results. A distinct color change from white to red, with a board detection range from 1 to 1000 ppm, could be detected within 10 s. Relatively high HOMO-LUMO gap and partially ligand-centered charge transfer (LC), led to the color change of Phen-Fe 2+ fibrous membrane. The binding energy between Fe 2+ and phenanthroline is strong, making it reliable to iron corrosion detection and adsorption in a real-life situation.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 32
·27164-27169
·
IF 3.289
Han Xu,Jun Zong,Fei Ding,Zhi-wei Lu,Wei Li,Xing-jiang Liu
To improve the electrochemical performance of LiMnPO4, a modified polyol reaction has been successfully developed for the preparation of LiMnxFe1−xPO4/C samples (x = 0.2, 0.5, 0.8). The secondary particles of the acquired LiMnxFe1−xPO4/C samples are spherical or annular, and the primary particles are nano-sized (20–80 nm). The LiMn0.8Fe0.2PO4/C has a higher energy density of 637 W h kg−1 compared with LiMn0.2Fe0.8PO4/C (575 W h kg−1) and LiMn0.5Fe0.5PO4/C (584 W h kg−1). The TEM image shows that the primary particles of LiMn0.8Fe0.2PO4/C are uniformly covered by a 3 nm carbon layer, and it can deliver a high discharge capacity of 161 mA h g−1 at 0.05C. At a 0.5C discharge rate, the LiMn0.8Fe0.2PO4/C can maintain 80.4% of its initial capacity after 900 cycles, and it also maintains 90% and 83% of its initial capacity at 45 °C and 55 °C respectively after 100 cycles. The results demonstrate that the modified polyol process is feasible for Fe-doping and carbon-coating to enhance the electrochemical performance of LiMnPO4.
研究领域:
材料科学
·
能源技术
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Yi Chen,Xiaowen Jiang,Junnan Wang,Zhengxiu Wu,Yuchen Wu,Zhonghua Ni,Hong Yi,Rongsheng Lu
The clinical challenge of high-accuracy blood glucose detection schemes is to overcome the detection error caused by the background interferences in different individuals. H2O2 as the specific product of glucose oxidation can be involved in the Fe2+/Fe3+ conversion and detected by the time-domain nuclear magnetic resonance (TD-NMR) method sensitively. But, in clinical applications, the oxidation of Fe2+ is susceptible to the complex sample substrates. In this work, we sorted out two kinds of possible interference mechanisms of Fe2+ oxidation in the NMR blood glucose detection method and proposed a feasible scheme that uses sorbitol to weaken the adverse effects of interference. We found that sorbitol-mediated Fe2+ can greatly enhance the sensitivity of the T2 value to H2O2. The chain reaction caused by sorbitol can significantly amplify the efficiency of Fe2+ oxidation at the same concentration of H2O2. Thereby, we can achieve the higher dilution multiple of serum samples to reduce the amount of interfering substances involved in the Fe2+/Fe3+ conversion. We justified the accuracy and availability of our method by successfully detecting and confirming the correlation between the T2 decrease and glucose concentration of the serum samples collected from 16 subjects. The sorbitol–Fe2+ glucose detection method with high sensitivity can be further combined with miniature NMR analyzers to satisfy the calibration requirements of glucose monitoring in diabetic patients instead of frequent medical visits.
研究领域:
医学诊断
·
生物化学
·
临床医学
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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）