Journal of Water Process Engineering
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2022
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IF 7.34
Yifan Liang,Zengrui Pan,Jianlong Sheng,Yongjiong Ni,Jun Li
To enhance nitrogen removal in wastewater treatment , a novel method of wrapping waste iron shavings (Fe-C) in polyurethane sponge cubes tied in anoxic zones of a continuous reactor was proposed. Three types of denitrifying bacteria were enriched simultaneously in biofilms and activated sludge , including iron autotrophic denitrifying bacteria (7.83–8.71 %), heterotrophic denitrifying bacteria (10.60–11.95 %), and heterotrophic nitrification-aerobic denitrifying bacteria (23.47–40.06 %). Iron autotrophic denitrifying bacteria ( Dechloromonas and Sphaerotilus ) can remove NO 3 − -N using Fe 2+ as electron donor produced by micro-electrolysis of iron shavings without organic carbon demand, and heterotrophic nitrification-aerobic denitrifying bacteria ( Ferribacterium and Zoogloea ) can simultaneously accomplish nitrification and denitrification under aerobic conditions . The enrichment of these two functional bacteria strengthened the nitrogen removal performance compared to conventional heterotrophic denitrifying process, which could achieve efficient and stable total nitrogen removal (87.4 %) even with low organic carbon. In addition, the synergy of biological and chemical processes through Fe-C micro-electrolysis also enhanced total phosphorus removal (86.0 %).
研究领域:
环境工程
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微生物学
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DOI
高影响因子
ENVIRONMENTAL RESEARCH
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2021
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IF 6.498
Zhendong Yu,Jiachen Ma,Jinlan Dai,Shiyu He,Xiaoyi Huang,Yuancai Lv,Yifan Liu,Chunxiang Lin,Junfeng Chen,Minghua Liu
In this study, a bimetallic composite catalyst (Co–Fe@C) was fabricated with calcination at high temperature (800 °C) by using Co-MIL-101 (Fe) as the precursor. The characterization results showed that the resulted Co–Fe@C composite mainly consisted of carbon, FeCo alloys, Fe 3 O 4 , Co 3 O 4 and FeO, and owned evident magnetism. In addition, the Co–Fe@C was employed to activate the peroxydisulfate (PDS) to degrade a representative organic pollutant ( p -arsanilic acid, p -ASA) and the main factors were optimized, which involved 0.2 g L −1 of catalyst dosage, 1.0 g L −1 of PDS dosage and 5.0 of initial pH. Under the optimal condition, Co–Fe@C/PDS system could completely degrade p -ASA (20 mg L −1 ) in 5 min. In the Co–Fe@C/PDS system, SO 4 − · , Fe(IV) and ·OH were the main species during p -ASA degradation. Under the attack of these species, p -ASA was first decomposed into phenols and then transformed into the organics acids and finally mineralized into CO 2 and H 2 O through a series of reactions like hydroxylation, dearsenification, deamination and benzene ring opening. Importantly, most of the released inorganic arsenic species (93.40%) could be efficiently adsorbed by the catalyst.
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
WATER SCIENCE AND TECHNOLOGY
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2024
·Vol. 90
·期 2
·649-663
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IF 2.5
Zou Yulong,Zhao Haiqian,Zhang Xiaolong,Wang Zhonghua,Yang Xue,Zhang Xing
View large Download slide View large Download slide Close modal The mechanism of phenol degradation by micro-electrolytic systems can be fully understood by evaluating the oxidation of active substances from the two aspects of phenol bond-breaking and mineralization, and the direction of promoting the generation of active substances is pointed out. In this article, the effects of H 2 O 2 , O 2 -• , ·OH and 1 O 2 in the degradation of phenol were analyzed using phenol and chemical oxygen demand (COD) removal rates as judgment indicators, respectively. And the addition of C 6 O 8 H 6 to the micro-electrolysis system was adopted to promote the generation of active substances. The experimental results showed that the active substances which played a dominant effect in the process of phenol bond-breaking and mineralization were changed. While 1 O 2 is dominant in the bond-breaking of phenol, •OH is dominant in the mineralization of phenol. After adding C 6 O 8 H 6 (1 mmol/L), the removal rates of phenol and COD were increased by 7.35 and 4.85%, respectively. This was attributed to the autoxidation reaction of C 6 O 8 H 6 and the continuous supply of H + while reducing Fe 3+ to Fe 2+ . Additionally, the C 6 O 8 H 6 regulated the reaction pathway to improve the utilization of H 2 O 2 . This study provides a new perspective for the understanding of active substances in micro-electrolysis systems. The main active substances in the bond-breaking and mineralization are different. is the main active substance in the phenol bond-breaking process. •OH is the main active substance in the phenol mineralization process. C 6 O 8 H 6 can promote the formation of active substances in the system. C 6 O 8 H 6 can promote the Fe 2+ /Fe 3+ cycle and improve the utilization of •OH.
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
WASTE MANAGEMENT
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2024
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IF 7.1
Fuyuan Qi,Jianfei Peng,Zilu Liang,Jiliang Guo,Jiawei Yin,Ainan Song,Zongxuan Li,Jiayuan Liu,Tiange Fang,Jinsheng Zhang,Lin Wu,Qijun Zhang,Ting Wang,Zhuofei Du,Hongjun Mao
The arbitrary disposal of used brake pads from motor vehicles has resulted in severe heavy metal pollution and resource wastage, highlighting the urgent need to explore the significant untapped potential of these discarded materials. In this study, The in-situ growth of highly dispersed Fe 2 O 3 nanocrystals was achieved by simple oxidation annealing of brake pad debris(BPD). Interestingly, Cu remained unoxidized and acted as a “valence state transformation bridge of Fe 2 O 3 ” to construct the “triple Fe-C-Cu sites”. The Fenton degradation experiment of pollutants was conducted under constant temperature conditions at 40 °C, a stirring rate of 1300 rpm, a pH value of 3, a catalyst dosage of 0.5 g/L, pollutant dosage ranging from 50 to 400 mg/L, and H 2 O 2 dosage of 0.25 g/L. Experimental results showed that BPD treated at 300 °C for 2 h exhibited optimal Fenton-like oxidation activity, achieving rapid degradation of over 90 % of refractory antibiotics, such as tetracycline and ciprofloxacin, in organic wastewater within 10 min. This remarkable performance was mainly attributed to the synergistic effect of “Fe-C-Cu triple sites”, where the electron-donating role of C in the Fe-C and Cu-C interfaces facilitated the conversion of the Fe(III) to Fe(II) and Cu(II) to Cu(I). In addition, the ability of Cu 2+ to accept electrons at the Fe-Cu interface promoted the transition from Fe (II) to Fe (III). This “balance of electron gain and loss” accelerated the interfacial electron transfer and the recycle of dual Fenton sites, Fe(II)/Fe(III) and Cu(I)/Cu(II), to generate more ·OH from H 2 O 2 . Therefore, this strategy of functionalizing BPD as Fenton-like catalysts without the addition of external Fe provides intriguing prospects for understanding the construction of Fe-based Fenton catalysts and resource utilization of Fe-containing solid waste materials.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Cui Wang,Qiangqiang Yang,Zhenhong Li,Kun-Yi Andrew Lin,Shaoping Tong
A magnetic carbon-coated Fe-C/N composite was synthesized by a simple impregnation method and its performance in activating persulfate (PS) to degrade Acid Red 73 (AR 73) was investigated. The as-prepared carbon-coated Fe-C/N hybrid material was characterized via transmission electron microscopy , Raman spectra, X-ray diffraction and X-ray photoelectron spectrum. Degradation experiments showed that 98.11% of AR 73 could be degraded in 10 min, but its COD was partly removed. The effects of initial reaction pH and temperature were also evaluated. An increase of temperature was beneficial for the removal of AR 73, while the increase of pH had an opposite result. The activation energy of the AR 73 degradation was determined to be 46.12 KJ/mol, smaller than those in relative literatures. The recycling test showed that the carbon-coated Fe-C/N composite had good stability. The mechanism study indicated that the catalytic performance of Fe-C/N was due to the synergistic effect between Fe 3 C and Fe 3 N, and the N doped carbon shell suppressed the rate of Fe leaching, thus enhancing its stability.
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
WATER RESEARCH
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2022
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IF 13.4
Siqi Liu,Andrey M. Kuznetsov,Weiqing Han,Alexei N. Masliy,Gregory V. Korshin
Methylated arsenic species are ubiquitous in the environment and resistant to removal by conventional treatment technologies. This study addressed this challenge based on the examination of the removal of dimethylarsinic acid (DMA) in a system that combines zerovalent iron (ZVI) and powdered activated carbon (PAC). The removal of DMA in the ZVI/PAC system was compared to that by coagulation, adsorption, electrochemical and Fenton oxidations, and other conventional methods. While only the electrochemical oxidation using a PbO 2 /Sb-SnO 2 /Ti anode allowed removing up to 60% DMA at several hours-long treatment times, the removal of DMA in the ZVI/PAC system containing 10 g/L ZVI and 2.5 g/L PAC with an initial pH of 2.0 was 95% for a 30 min reaction time. Specific roles of PAC, ZVI and its oxidation products in DMA removal were examined based on the spectroscopic data and quantum chemical modeling for the DMA/Fe(II) and DMA/Fe(III) systems. These methods demonstrated the formation of moderately strong DMA/Fe(II) and DMA/Fe(III) complexation. These results and relevant kinetic data were interpreted to indicate that the removal of DMA is governed by the rapid generation of Fe 2+ ions released as a result of accelerated ZVI corrosion in the galvanic ZVI/PAC microcells and ensuing formation of DMA/ Fe 2+ complexes that are readily adsorbed by PAC.
研究领域:
环境科学
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化学工程
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水处理
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DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
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2021
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IF 9.642
Pingbo Wang,Meiying Ye,Yue Cui,Xiong Xiao,Dexun Zou,Rongxin Guo,Yanping Liu
Two-phase high-solid digestion is conducive to the degradation of food waste. In this study, Fe/C was added in high-solid digestion in different acidification and/or methanogenic phase. The experimental results indicated that it significantly increased the cumulative yield of biomethane. When Fe/C was added to the acidification phase only and both the acidification and methanogenic phases, the biomethane yield reached 474.07 ± 7.03 and 475.47 ± 4.68 mL·g VS −1 , respectively, and the biodegradation rate reached 87.30% and 87.58%, respectively, indicating that Fe/C had mainly effect on the performance of acidification phase. In a two-phase anaerobic fermentation system, the activity of dehydrogenases and the concentration of coenzyme F 420 were 2.23–2.95 mg·g −1 ·h −1 and 0.0063–0.0294 mol·g −1 volatile solids, respectively. Additionally, the archaeal communities production pathway of methane from using acetic acid to using hydrogen as the reactant.
研究领域:
环境工程
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微生物学
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废物管理
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生物技术
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2021
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IF 5.097
Xiaobin Zhou,Mengjun Wang,Mengke Wang,Xingguang Su
Herein, a colorimetric detection strategy for alkaline phosphatase (ALP) activity was established based on an Fe-doped carbon-based nanozyme. By doping Fe into a Zn MOF and introducing dicyandiamide for pyrolysis, we obtained a two-dimensional carbon nanosheet with exceptional peroxidase-mimicking activity (Fe/C NS). The Fe/C NS has superior affinity to H2O2, can decompose H2O2 into reactive oxygen species, and further oxidize reducing substances such as phenol. ALP can hydrolyze disodium phenyl phosphate into phenol, while the Fe/C NS can promote the reaction between phenol and 4-aminoantipyrine in the presence of H2O2 to produce red quinone imine. Based on the changes of absorbance of the reaction system, ALP activity can be detected in a range of 0.05–6.00 U·L–1 with a detection limit of 0.03 U·L–1. Furthermore, we developed a quantitative relationship between ALP activity and color characteristic values by recording the RGB (red, green, and blue) values of color changes under different ALP concentrations, realizing the convenient determination of ALP activity without specific analytical equipment. This work can effectively broaden the application of nanozymes in biological analysis.
研究领域:
生物化学
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医学检验
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纳米生物学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yi Chen,Rong Qiang,Yulong Shao,Jiawen Qiu,Qian Ma,Xiao Yang,Rui Xue,Bowen Chen,Shijiang Feng,Yuancheng Ding
Magnetic metal modified carbon-based composites synthesized through chemical methods have shown great potential in the field of electromagnetic wave (EMW) absorption. Biomass-derived carbon, as an alternative to traditional carbon sources, has better economic and environmental benefits. In this work，we embedded magnetic iron ions in dried agaric through multi-effect adsorption and obtained ripple-like Fe/C composites after high-temperature annealing. The effective absorption bandwidth (EAB) of Fe/C composites can reach 6.3 GHz (11.5–17.8 GHz) at 2.5 mm, achieving broadband electromagnetic response. The excellent performance can be attributed to the ripple-like carbon, which enhances the transmission path of EMW in the absorber. On the other hand, the uniform loading of Fe nanoparticles on biomass-derived carbon promotes the interface polarization and dipole polarization and coordinates the impedance matching of the composites. This study provides a reference for the design and construction of efficient biomass-derived magnetic carbon-based absorbers.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
DIAMOND AND RELATED MATERIALS
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2022
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IF 3.806
Yan Wang,Guiyang Xian,Chongmei Wu,Zhaolin Zhu,Yin Liu,Zhenying Liu,Ling Bing Kong
An in-situ carbonization process was used to prepare nitrogen-doped Fe@C composites, from the complex matrix of polyaniline and iron, for electromagnetic wave (EMW) absorption. The basic idea is to introduce a variety of EMW absorption mechanisms, including dipole polarization due to the nitrogen doping and multiple interface reflection owing to the structural collapse. By adjusting the ratio of the components in the complex, EMW absorption performance of the final composites could be readily optimized while the mass ratio of Fe 2 O 3 /polyaniline was 0.6. Specifically, a reflection loss of −66.92 dB at 2.46 mm can be achieved, while an effective absorption bandwidth of 6.40 GHz (11.60 GHz–18.00 GHz) at 2.36 mm.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Gang Fang,Chuyang Liu,Xinyu Wei,Qinyu Cai,Chi Chen,Guoyue Xu,Guangbin Ji
Regulating the inner defects could lead to transformation of the prominent dielectric loss for the microwave absorbers, which is a necessary foundation to explore the preference type of dielectric loss mechanism. Herein, in this work, selective molar ratios of melamine/cetyl trimethyl ammonium bromide (CTAB) precursors were designed to construct the Fe/C/N based hybrid materials. The results demonstrate that the dominated polarization loss can be obtained with the high molar ratio of melamine/CTAB due to the improved level of defects density such as point defects, heterointerface distortion, etc . Differently, it is easy to obtain the conductive carbon phase and high crystallinity degree of Fe 3 C with a low melamine/CTAB molar ratio, achieving significantly conductive loss. Finally, the Fe/C/N hybrid with dominant polarization loss harvests a broad bandwidth of 6.2 GHz at 1.7 mm, verifying the superiority of polarization loss for enhancing electromagnetic absorption performance. Furthermore, simulation results prove that this composite possesses the desirable radar cross section (RCS) reduction and electromagnetic protection for the human head, indicating the potential applications in both military and civilian fields.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Wei Ling,Peng Liao,Jiawei Zhu,Jianxin Wu,Caiwei Hu,Xianke Zhang,Jujun Yuan,Zuzhou Xiong,Xiurong Zhu,Chuicai Rong
Metal–organic framework (MOF) derivatives have emerged as promising candidates for designing lightweight, high-performance electromagnetic wave absorption (EMWA) materials owing to their tunable porosity, compositional diversity, and structural flexibility. In this study, a hybrid material (Nd/Fe-MOF) comprising Nd- and Fe-based MOFs was constructed via ion-exchange engineering based on an MOF-plus-MOF strategy, involving partial exchange between Nd³⁺ and Fe³⁺ ions. The subsequent pyrolysis of Nd/Fe-MOF yielded a particle-decorated bundle-like Nd 2 O 3 /Fe@C nanocomposite, which exhibited an exceptional EMWA performance with a minimum reflection loss (RL min )of −60.13 dB and an effective absorption bandwidth (EAB) of 5.0 GHz at a thin thickness of 1.8 mm. Moreover, Nd 2 O 3 /Fe@C also displayed an enhanced absorption with an EAB of 2.1 GHz (5.2–7.3 GHz) at low-frequency C band. This outstanding EMWA behavior can be attributed to the optimized impedance matching induced by the introduction of Nd 2 O 3 , and the prolonged propagation paths of EMW caused by the bundle-like structure. In order to present the practical application, CST simulation showed that the reduction value of radar cross section (RCS) of Nd 2 O 3 /Fe@C could reach up to 32.6 dB m² compared to the pure perfect electric conductor (PEC) substrate. Therefore, this study demonstrates the feasibility of employing ion-exchange engineering for the optimization of electromagnetic parameters and the subsequent development of high-efficiency rare earth–based absorbers.
研究领域:
材料科学
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纳米技术
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电磁学
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微波工程
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产品关联
DOI
高影响因子
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