ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Zhen Bi,Wenjing Zhang,Min Ni,Ge Song,Yong Huang
The anammox bacteria (AnAOB) have been suggested to perform dissimilatory Fe0/Fe2+-dependent nitrate reduction to ammonium (DNRA), with nitrite as intermediate. However, evidence at genetic and transcriptional levels for how AnAOB reduces nitrate is still lacking, making their roles in this process obscure and questionable. The short-term batch assays and long-term operation of bioreactor combined with 16S rDNA sequencing and transcription analysis were used for the first time to investigate the nitrate reduction pathway in anammox consortia. It is shown that AnAOB metabolically well grew with nitrate as the sole nitrogen source. They reduced nitrate to nitrite with highly expressed narG gene. However, the DNRA-enabling gene nrfA was not expressed by AnAOB. Abiotic reduction by Fe0/Fe2+ contributed to the nitrate and nitrite reduction to ammonium. The correlation analysis of microbial community structure and metabolic functions indicated that amino acid and carbohydrate transport and metabolism interactions in coexisting bacteria could facilitate the AnAOB growth with nitrate as the only nitrogen source. Our findings suggest that the contribution of enzymatic DNRA by AnAOB to the observed nitrate reduction has been probably overestimated in previous publications, and it should be questioned until the clear enzymatic mechanism responsible for nitrate reduction is identified.
研究领域:
微生物学
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环境科学
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生物技术
✓ 已验证
DOI
高影响因子
ANALYTICAL BIOCHEMISTRY
·
2023
·
IF 2.9
Ye Sun,Guangda Xu,Yue Wang,Peng Song,Yao Zhang,Lixin Xia
Herein, we developed a concise, time-efficient, and high selective assay for detecting Fe 2+ through its triggered surface plasmon-assisted reduction reaction of p -nitrothiophenol (PNTP) to p,p ′-dimercaptoazobenzene (DMAB) on the surface of gold nanoparticles (AuNPs) based on surface-enhanced Raman scattering (SERS) spectroscopy. When Fe 2+ was added to the PNTP-AuNPs system, the appearance of three characteristic peaks at 1142, 1392, and 1440 cm −1 attributed to DMAB demonstrated that Fe 2+ induced the catalytic coupling reaction of PNTP. The Raman intensity ratio of the peak at 1142 cm −1 to the peak at 1336 cm −1 and the concentration of Fe 2+ presented a good linear response from 10 to 100 μM with a limit of detection (LOD) of 0.35 μM. More importantly, the entire detection process can be completed within 2 min and further successfully used for the detection of Fe 2+ in river water.
研究领域:
分析化学
·
纳米技术
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Mingxia Sun,Hongjie Song,Haiyi Liu,Yingying Su,Xiaobo Xie,Yi Lv
Sulfur dioxide (SO2) as one kind of air pollution not only causes extreme environmental pollution but also negatively affects human health. Chemiluminescence (CL) methods applied for sulfite analysis with high selectivity based on activating sulfite with oxidants are always implemented in acid media with a high background rise. In this work, we proposed to develop a mild CL system of Fe2+-SO32– to detect sulfite under neutral conditions and provide in situ CL spectral data for deeply studying the CL mechanism of Fe2+-SO32–. Herein, we first synthesized one type of water-soluble supramolecular nanosheets, APDI NSs, which had a strong oxidation potential (+2.9 V) due to a π-conjugated system for activation of sulfite to enhance the generation of SO3̇– and other active radicals, and strong a CL signal from the APDI NSs-Fe2+-SO32– system was generated. By studying the CL mechanism under acidic and neutral conditions, a new CL reaction pathway (path-1) and a key intermediate, S2O42–, from the reaction of Fe2+ and SO32– were found. The CL signal was emitted by SO2* after oxidation of S2O42– by strong oxidants like SO4•– and further amplified by APDI NSs through the CL resonance energy transfer (CRET) process. Based on the APDI NSs-Fe2+-SO32– system under neutral conditions, a CL method for detecting SO32– was established. The detection limit was 2.7 × 10–8 M (S/N = 3), and the recovery rates in spiked water samples were in the range of 87%–101%. This study strengthens the understanding of the CL reaction process of the Fe2+-SO32– system and provides a mild sulfite sensing platform for environmental samples.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 41
·19202-19209
·
IF 3.3
Xinlei Zhang,Peng Liu,Yuchi Zhang,Bohan Li,Yan Xu
Almost all types of proteins in biology are composed of L-amino acids, and very few contain D-amino acids. Therefore, chiral recognition, especially for the detection of L-amino acids, is of great importance. In this work, luminescent zinc-doped carbon dots (Zn-CDs) were successfully synthesized through a one-step hydrothermal method using [Zn(EDA)3]Cl2 (EDA = ethylenediamine) complex as a precursor, exhibiting superior water stability, low cytotoxicity and good photobleaching stability. It can be used as an “on–off–on” fluorescence probe in aqueous solution to sequentially detect Fe2+ ions and enantiomeric L-Lysine (L-Lys) molecules with the corresponding limit of detection (LOD) of 0.092 and 0.204 μM, respectively. Also, the sequential on–off–on fluorescent changes of Zn-CDs upon the addition of Fe2+ and L-Lys can be applied in living cell imaging, as observed by the contrast of images in confocal microscopy. In addition, two distinct multi-input molecular logic gates, involving distinguishing the effect of L-Lys and D-Lys on the fluorescence of Zn-CDs, and the regulation of fluorescence quenching and recovery of Zn-CDs by Fe2+ ions and L-Lys are established. The Zn-CDs also exhibits a linearly temperature-dependent fluorescence performance with high temperature sensitivity (Sr) of 1.10% °C−1 in 10–90 °C, demonstrating its great potential for biological temperature sensing applications. This work provides a new strategy for exploring novel metal-doped carbon dots with outstanding biocompatibility and multifunctionality in biological applications.
研究领域:
材料科学
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分析化学
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生物技术
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yun Ji,Zhelin Song,Yu Xu,Yanlin Zhang
In this work, typical refractory pollutant Rhodamine B (RhB) was effectively degraded by Cu-Fe LDHs/Bi 2 WO 6 composite in the photo-Fenton process. The hydrothermal synthesis of Cu-Fe LDHs/Bi 2 WO 6 composite with ethylene glycol as reductant created the multivalent coexistence of the same metal element to achieve a self-circle redox reaction between metals. The photo-Fenton process by Cu-Fe LDHs/Bi 2 WO 6 incredibly eliminated the limitation of strong acidic pH value applied in the Fenton process. ∙OH generated by Cu-Fe LDHs/Bi 2 WO 6 was 5 times that of Cu-Fe LDHs during the photo-Fenton process. The complete degradation of RhB in the photo-Fenton process under the optimal conditions of initial pH= 6, 5 mmol/L of H 2 O 2 , and 1 g/L of Cu-Fe LDHs/Bi 2 WO 6 dosage was far more than 46% of RhB degradation in the photocatalytic process and 76% of RhB degradation in the Fenton process. Cu-Fe LDHs/Bi 2 WO 6 composite exhibited the excellent redox ability, electron transfer ability and reusability during the photo-Fenton process. The acceleration of Fe 3+ /Fe 2+ cycles in the Cu-Fe LDHs/Bi 2 WO 6 /H 2 O 2 /Vis system was mainly ascribable to the combination of efficient transfer of photogenerated electrons and self-circle redox of Fe 3+ /Cu + . It is expected for the promising application of multivalent bimetallic photo-Fenton catalysts and rendering enlightenments for photo-Fenton catalytic oxidation reaction.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Xiaojun Lai,Nuoyi Huang,Xiaohua Zhao,Yang Li,Yao He,Jiesen Li,Jinhuan Deng,Xun-an Ning
Aromatic amines (AAs), a characteristic pollutant with electron-donating groups in textile industry , having high reactivity with reactive chlorine free radicals, is probably the precursor of chlorinated aromatic products in advanced oxidation treatment . In this study, Fe2+/peroxydisulfate (PDS)/Cl- and Fe2+/H2O2/Cl-systems were used to treat four kinds of AAs (5-Nitro-o-toluidine (NT), 4-Aminoazobenzol (AAB), O-Aminoazotoluene (OAAT), 4,4′-Methylene-bis(2-chloroaniline) (MBCA)) in simulated wastewater, and the selectivity of various reactive species to AAs, the oxidation law and pathway of AAs were explored. The results showed that dichloride anion radical (Cl2·-) could effectively oxidize four AAs, and chlorine radical (·Cl) was strongly reactive to AAB and MBCA, especially MBCA. The largest f – (Fukui function) of MBCA is 0.0822, which is the lowest of the four AAs, so ·Cl might be more sensitive to electrophilic point than hydroxyl radical (·OH). The oxidation pathway of NT and MBCA showed that ·Cl mainly played the role of electron transfer to AAs instead of generating chlorinated products, but the addition of ·OH to –NH2 generated aromatic nitro compounds with higher toxicity than NT and MBCA. Therefore, the electron transfer of ·Cl and Cl2·- could not only improve the removal of AAs but also reduce the generation of toxic products. This study found that the reactivity of reactive chlorine free radicals was not necessarily related to chlorination, which provided a theoretical basis for the further studies into the formation mechanism of chlorination products.
研究领域:
环境化学
·
水处理
·
高级氧化过程
·
污染物降解
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Miao Jiang,Kun Wang,Ruiyuan Xue,Qingliang Zhao,Long Wang,Weiye Wang,Jing Ding
Antimony (Sb) finds its wide application in industries, however, the research on Sb solidification/stabilization (S/S) in the Sb-contaminated soil is currently insufficient, particularly in seasonal freezing regions. Here six composite materials of Fe/Fe 2+ -fly ash-concrete additive (Fe-FA-CA) were employed and optimized to remediate the Sb-contaminated soil subject to 40 freezing-thawing (F-T) cycles. After remediation, FeSO 4 -fly ash-calcium lignosulfonate (FFC) exhibited the best resistance performance to F-T. The stabilization efficiency was evaluated with TCLP at 92.92%. Meanwhile, Sb concentration met the criteria of landfill for inert waste assessed with the compliance test for leaching (CT) of European Standard . The S/S efficiency of Sb dropped slightly from 92.68% to 88.22% (TCLP) and from 97.18% to 93.37% (CT), respectively, after aging 40 F-T cycles. The fraction of residual Sb in the soil treated by FFC was increased by 10.41%, and the strength of the S/S soil was much higher than 350 kPa, the requirement of landfills in the U.S. during F-T cycles. Additionally, the poorly crystalline Fe in the soil remediated by FFC was increased by 4.54 g/kg, suppressing Sb migration. The feasibility and effectiveness of FFC in S/S of Sb demonstrated its potential to remediate Sb-contaminated soil in seasonal freezing regions.
研究领域:
环境科学
·
土壤学
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材料科学
·
废物管理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2025
·
IF 6.3
Aiyu Niu,Xin Li,Shanshan Yang,Fei Liu
The chemical reduction of pollutants by Fe 2+ aq -iron oxides heterogeneous systems is an important component of abiotic natural attenuation. A linear free energy relationship (LFERs) can be established between the reduction potential ( E H ) of the heterogeneous system and the kinetic parameter ( k ) of pollutant degradation. However, this relationship was limited to a single iron oxide. The difference in iron oxides particle size and the coexisting anions and cations in groundwater should also be considered. Here, this study investigated the effect of coexisting ions on the nitrobenzene reduction in the Fe 2+ aq -goethite systems with different particle sizes, and explored the response of LFERs. The results indicated that the standard reduction potential ( E 0 H) of Gt-200 was highest among Gt-200, Gt-700 and Gt-1000. However, the nitrobenzene reduction rate exhibited the highest in the Fe 2+ aq -Gt-200 heterogenous systems, which was ascribed to the best adsorption affinity of Fe 2+ aq on Gt-200. Besides, the presence of cations and anions inhibited the reduction rate of nitrobenzene. As for LFERs, the slopes were the same for the Fe 2+ aq -goethite systems with different particle sizes and coexisting ions. The intercept terms were different. The maximum difference in intercept terms was reduced from 0.98 to 0.37 by correcting the LFERs based on the saturated adsorption capacity of Fe 2+ aq . The adsorption performance of Fe 2+ aq on goethite was an important factor affecting the reduction of nitrobenzene. These findings would provide theoretical support for accurately predicting the abiotic natural attenuation rate of nitrobenzene in the presence of coexisting ions in actual groundwater.
研究领域:
环境化学
·
地球化学
·
水污染与治理
·
物理化学
·
环境科学
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Meice Lu,Li Zhou
Fluorescent carbon quantum dots (CQDs) can be prepared by sonochemistry with low cost and high efficiency. However, ultrasonic synthesis of CQDs with responsive fluorescence towards environmental stimuli remains a big challenge. Herein, we report a simple one-step method to fabricate versatile nitrogen-doped CQDs (NCQDs) by ultrasonic treatment of dopamine in dimethylformamide for 8 h. The obtained NCQDs simultaneously possess superior water dispersibility and stability, bright and stable fluorescence against variations of pH and ionic strength, low cytotoxicity and high photostability. Moreover, the fluorescence of NCQDs showed sensitive quenching phenomenon towards Fe 2+ ions both in water and in the interior of cancer cells. The emission intensity of NCQDs exhibited good linear relationship ( R 2 = 0.9987) with the concentration of Fe 2+ ions in the range of 0–50 μM. The limit of detection can reach as high as 38 nM. Meanwhile, the NCQDs also exhibited temperature-dependent fluorescence with favorable linear relationship ( R 2 = 0.9965) in the range of 283–358 K, and thus can server as a nanothermometer to sense temperature both in water and in cells.
研究领域:
材料科学
·
分析化学
·
纳米技术
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2020
·
IF 5.715
Qi Song,Xiaojun Niu,Dongqing Zhang,Xiaofei Song,Yankun Li,Jinling Ma,Senchao Lai,Zhiquan Yang,Shaoqi Zhou
The frequent occurrence of toxin-producing cyanobacteria blooms driven by anthropogenic eutrophication has become a major threat to aquaculture ecosystems worldwide. In this study, the behavior of M. aeruginosa cells during flocs storage period of 6 days was first investigated after pre-oxidation and coagulation of Fe 2+ /PS. Fe 2+ /PS achieved a superior removal efficiency of 90.7% for OD 680 and 90.4% for chl-a. The contents of extracellular MCs in the pre-oxidation and coagulation system were significantly ( P < 0.05) lower than those in the control. A significant ( P < 0.05) difference in intracellular protein between the control and the coagulated systems was observed. Three-dimensional fluorescence excitation emission matrix (EEM) was employed to investigate the variations in extracellular organic matter (EOM) during flocs storage. The results indicated the presence of four peaks, representing protein-like substances, intermediate dissolved microbial metabolites, fulvic and humic-like compounds in the Fe 2+ /PS process. And the intensities of four peaks were all decreased in the Fe 2+ /PS system compared to those in the control. A low level of accumulated residual Fe of 0.28 mg/L was observed without posing potential environmental risk. The results showed that the M. aeruginosa cells were under stressful conditions after 3-d storage due to the decomposition of extracellular polymeric substances (EPSs) and the insufficient supply of nutrients. However, SEM results indicated that no significant alteration in cell morphology was observed. Therefore, with high removal of M. aeruginosa , low MCs concentrations, and trivial cell damage, the Fe 2+ /PS preoxidation-coagulation was proved to be an environmental-friendly method for cyanobacteria removal without yielding serious secondary pollution. This work will contribute to better understanding and managing the cyanobacteria-laden aquaculture water after pre-oxidation and coagulation.
研究领域:
环境科学
·
水产养殖
·
水处理
·
微生物学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Lingling Hu,Yuhong Liao,Dehua Xia,Fei Peng,Li Tan,Shaoyun Hu,Changshuo Zheng,Xiaolong Lu,Chun He,Dong Shu
A visible-light-driven photocatalytic fuel cell system integrating electro-Fenton process (EF-PFC), comprised of oxygen vacancies-rich rGO/BiO 1−x I photoanode and biomass-derived N-doped carbon (BNC) cathode, was developed to eliminate organic pollutant and generate electricity synchronously. The structure and properties of rGO/BiO 1−x I were characterized by means of XRD, SEM, TEM, solid-state EPR, FTIR, Raman, XPS, UV-vis DRS and PL spectra. The photoelectrochemical activity of rGO/BiO 1−x I was characterized by Mott-Schottky plots, photocurrent responses and EIS. The experimental results indicated that the introduced oxygen vacancies and graphene modification not only promoted the light-harvesting ability but also greatly improved the generation and transfer rate of charge carriers. Most importanly, BNC, acted as cathode, could efficiently reduce oxygen to H 2 O 2 , thus leading to more ·OH production in the presence of Fe 2+ . Simultaneously, the photogenerated electron could efficiently accelerate Fe 2+ /Fe 3+ redox cycling for continuous Fenton reaction and increasing electricity generation in synergistic EF-PFC system. Using formic acid as sacrificial fuel, approximately 68% removal efficiency was reached in rGO/BiO 1−x I-BNC EF-PFC system under visible light irradiation for 240 min while the photocurrent density ( J sc ) and the maximum power density ( P max ) were measured to be 133.18 μA cm −2 and 17.50 μW cm −2 . Furthermore, the radicals trapping experiments, hydrogen peroxide quantitative studies and ESR tests clearly revealed the mechanism of enhanced performance in rGO/BiO 1−x I-BNC EF-PFC system. Therefore, this engineered rGO/BiO 1−x I-BNC EF-PFC system with the cooperation of Fe 2+ /Fe 3+ redox is a promising means to eliminate organic pollutants and generate electricity synchronously.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Xinhui Hou,Yifan Song,Yupeng Lv,Peiyao Wang,Kun Chen,Guiying Li,Lei Guo
Temperature-responsive nanomicelles with aggregation induced emission (AIE) property were prepared by the host–guest complexation of ferrocene functionalized tetraphenyl (TPE-Fc) and β-cyclodextrin-poly ( N -isopropylacrylamide) (β-CD-(PNIPAM) 7 ). The AIE chromophore TPE-Fc bound to the hydrophobic cavity of cyclodextrin serves as the core of micelles, and temperature sensitive PNIPAM serves as the shell to give the micelles good solubility. The size of the nanomicelles is about 100 nm. At the excitation wavelength of 340 nm, the strongest fluorescent emission peak was 421 nm. The introduction of cyclodextrin star polymer increased the fluorescence intensity of nanomicelles, thus improving the recognition of probe to Fe 3+ and Fe 2+ . The fluorescent probe can quickly detect Fe 3+ and Fe 2+ in water within 5 min even in the presence of various interfering ions. The detection limits of Fe 3+ and Fe 2+ were 1.04 μM and 0.78 μM, respectively in the range of 10–90 μM. The formation of complex between the probe and Fe 3+ /Fe 2+ was supported by Job’s plot. The probe was successfully applied to the detection of Fe 3+ and Fe 2+ in actual water sample with a good recovery. In addition, a possible sensing mechanism for the interaction of iron ions with amide bond groups of nanomicelles was proposed.
研究领域:
材料科学
·
分析化学
·
纳米技术
✓ 已验证
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）