SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
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IF 2.931
Fuyou Du,Zhenfang Cheng,Wei Tan,Lingshun Sun,Guihua Ruan
Sulfur-doped carbon quantum dots (S-CQDs) with stable blue fluorescence were synthesized through a facile one-step hydrothermal method by using ascorbic acid and thioglycolic acid as carbon and sulfur sources. The prepared S-CQDs exhibited a sensitive and selective response to Fe 3+ ions in comparison with Fe 2+ and other metal ions , In the presence of adequate H 2 O 2 , Fe 2+ was completely transformed to Fe 3+ that is the determinable form of iron ions , and the difference in the change of the fluorescence intensity of S-CQDs before and after adding H 2 O 2 was used for detection of Fe 2+ and Fe 3+ ions, respectively. Under the optimum experimental conditions, the fluorescence intensity of S-CQDs gradually decreased with increasing of Fe 3+ concentration ranging from 0 to 200 μM. Good linearity was achieved over the range of 0-200 μM. The detection limit of the developed method was 0.050 μM for Fe 3+ . The recoveries of Fe 2+ and Fe 3+ spiked in real samples ranged from 98.2% to 112.4%. Finally, the proposed S-CQDs integrated with Fenton system was applied to the detection of Fe 2+ and Fe 3+ ions in oral ferrous gluconate samples, which presents potential applications in the speciation and determination of Fe 2+ and Fe 3+ ions in complex samples.
研究领域:
分析化学
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材料科学
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医学检测
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DOI
PubMed
高影响因子
CHEMOSPHERE
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2022
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IF 8.943
Xuesong Ye,Zhencheng Ge,Qiliang Xiao,Bohan Liu,Meng Chen,Fangmin Wu,Jun Nan
In remote areas, low-pressure ultrafiltration membrane (LPM) systems can be applied in decentralized water supplies for the treatment of groundwater containing Fe 2+ , Mn 2+ , and NH 4 + . However, improving the performance of the LPM systems, such as the stable flux and removal capacity, presents a challenge. In this study, a novel opposite-flow low-pressure ultrafiltration membrane (O-LPM) system was applied, and its performance was evaluated. Experimental results showed that after 46 days of operation, the steady flux of the O-LPM systems were 1.87-fold and 1.74-fold higher than that of the conventional D-LPM systems under Mn 2+ concentration of 0.3 mg L −1 and 1.5 mg L −1 , respectively. With a mixed pollutant system containing Fe 2+ (0.5 mg L −1 ), Mn 2+ (0.3 mg L −1 ), and NH 4 + (1.0 mg L −1 ), the O-LPM-ripening period for Mn 2+ removal was shortened from 16 days to 8 days, and the NH 4 + removal efficiency was increased from 61.46% to 80.97%. The bio-cake layer in the O-LPM systems was thinner and had a higher uniformity than in the D-LPM systems, resulting in a larger stable flux range. The relative abundance of functional bacteria (MnOB, IOB, and NOB) was generally higher in O-LPM systems than in the D-LPM systems. Overall, these results are of high relevance for groundwater treatment in remote areas, providing guidance for the widespread application of the O-LPM system in decentralized water supplies.
研究领域:
环境工程
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微生物学
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 31
·31358-31367
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IF 2.8
Wan Zhong,Wang Jianlong
The advanced treatment of municipal secondary effluent by heterogeneous and homogeneous Fenton processes using Fe/Ce-RGO (reduced graphene oxide) and Fe 2+ as catalysts was studied and compared. Sulfamethazine (SMT) was spiked in the effluent to examine the effectiveness of the emerging contaminant removal. The Fe/Ce-RGO catalyst was characterized using a scanning electron microscope (SEM) and cycle voltammetry curves. The removal of dissolved organic carbon (DOC), soluble chemical oxygen demand (SCOD), SMT, and ultraviolet-visible spectroscopy in 254 nm (UV 254 ) of municipal secondary effluents was examined. The DOC removal efficiency of secondary effluent (without addition of SMT) was 36.30% and 11.74% using Fe/Ce-RGO and Fe 2+ as catalysts, respectively. The removal efficiency of DOC, SCOD, and SMT in heterogeneous Fenton process was higher than that in homogeneous Fenton process. The changes of three-dimensional excitation-emission matrix (3DEEM) fluorescence, soluble microbial products (SMPs), humic acids, and UV 254 were determined, and the results indicated that UV 254, aromatic proteins, and humic acids decreased rapidly in both processes; however, polysaccharides and protein-like substances were difficult to degrade. Although some toxic substances produced after Fenton-like treatment, the biodegradability of the treated effluent was enhanced.
研究领域:
环境科学
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污水处理
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催化材料
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DOI
PubMed
高影响因子
Small Methods
·
2022
·Vol. 7
·期 1
·2201266
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IF 15.367
Mingjun Nan,Min Wu,Yuqin Liu,Lin Qiao,Huamin Zhang,Xiangkun Ma
Aqueous manganese-based flow batteries (AMFBs) have attracted great attention due to the advantages of low cost and environmental friendliness. Extending the cycle life of AMFBs has long been a challenging theme. The titanium-manganese single-flow batteries (TMSFB) are promising due to their special structure and electrolyte composition. However, TMSFB with high areal capacity faces capacity decay for unknown reasons. In this work, the capacity decay mechanism (accumulation and growth of MnO 2 ) is clarified by a homemade in situ microscope system. Given that, a redox mediator of Fe 2+ /Fe 3+ is specially designed to boost the areal capacity of TMSFB without side reaction. The directional promoting principle of the Fe 2+ /Fe 3+ is elaborated in detail. Fe 2+ chemically reacts with the residual MnO 2 to form Fe 3+ , which is reduced to Fe 2+ by the electrochemical reaction. And then Fe 2+ continues reacting with MnO 2 until MnO 2 is consumed completely. As a result, the TMSFB with the areal capacity of ≈55 mA h cm −2 can stably operate at a current density of 40 mA cm −2 , which is the highest areal capacity reported in aqueous manganese-based batteries. This work provides a new strategy for boosting the capacity of manganese-based batteries, shedding light on the improvement of other deposition-type batteries.
研究领域:
电化学
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能源材料科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Menghan Sun,Jinshuo An,Zonglin Pan,Guoqing Feng,Xinfei Fan,Chengwen Song,Tonghua Wang
Electrochemical filtration process (EFP) which adopted the coal-based carbon membrane (CCM) as both anode and filter was successfully applied for organic wastewater treatment and presented the promising prospects. In this work, a further enhancement on the wastewater treatment performance of EFP was achieved through the simple Fe 2+ addition (Fe-ECM). The mechanism of the enhanced treatment performance for Fe-ECM system was explored and the effect of operational parameters on the wastewater treatment performance of Fe-ECM system were studied. Results showed that Fe-ECM system established an almost 100% removal efficiency for 250 ppm RhB simulated wastewater when 13.2 μM Fe 2+ was added in the system, which was much higher than that of membrane filtration by CCM or electrochemical filtration carbon membrane (ECM) system. The performance enhancement of Fe-ECM system was attributed to the Fenton process: the hydrogen peroxide (H 2 O 2 ) was electrochemically generated on CCM via the reaction between H 2 O and dissolved oxygen, thus more hydroxyl radical (·OH) was produced in the Fe-ECM system compared with the ECM system through Fenton reaction between the generated H 2 O 2 and Fe 2+ in the solution. Moreover, the Fe-ECM system displayed a good applicability for the decontamination of different organic wastewater and a good reusability was observed for several cycles operation. This work provided an alternative way to enhance the organic wastewater treatment performance of ECM process.
研究领域:
环境科学
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污水处理
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材料科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Jie Lou,Jian Zheng,Zhijia Zhu,Chunyan Hu,Baojiang Liu
Owing to low biotoxicity, excellent stretchability, and good adhesion properties, hydrogel sensors have received extensive attention from the academic community and developed rapidly. Many scholars have made a series of efforts to explore suitable rapid gelation schemes, which have greatly expanded the development space of hydrogel sensors, but the existing rapid gelation schemes are inevitably cumbersome or costly while achieving rapid gelation. In this work, a simple and inexpensive controlled rapid gelation scheme was found, which only requires the addition of a thermal initiator and ammonium ferrous sulphate into the gel system to enable the controlled rapid formation of chitosan/acrylamide hydrogels at room temperature. In this study, while achieving rapid gelation (within 12 s), the physical properties as well as the sensing properties of the hydrogels were improved by adding Al 3+ and MXene. The final composites obtained have good physical properties (stress 500 kPa, strain 2640 %), excellent sensitivity (GF = 4.48, deformation of 200–500 %), and adhesion properties to a wide range of materials. The chitosan/acrylamide/MXene sensors prepared by this protocol have the effect of detecting different movements of the human body, including repetitive or fine movement changes.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF TRACE ELEMENTS IN MEDICINE AND BIOLOGY
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2021
·
IF 3.849
Jianjun Guo,Xiaoliang Wang,Wenrong Wang,Lingling Jia,Wei Guo,Guohua Wu
Background Phoxim is a widely used organophosphorus pesticide in agriculture. People are paying more and more attention to its toxicity. At present, there is no appropriate way to solve the phoxim poisoning of silkworm , which severely affected the development of sericulture . Fe 2+ , Cu 2+ , Rb + exerted their biological effects through various forms in vivo . Methods To evaluate the effect of Fe 2+ /Cu 2+ /Rb + on phoxim poisoning in silkworm, Bombyx mori were treated with fresh mulberry leaves soaked in 2.5 mg/L phoxim for 2 min with 50 mg/L FeCl 2 , 150 mg/L CuCl 2 , or 0.5 mg/L RbCl from 5 days of the fifth-instar silkworm. Results Fe 2+ , Cu 2+ , and Rb + pretreatments significantly inhibited the phoxim-induced reduction of survival rate and alleviated the phoxim-induced poisoning symptoms. The protective effects of Fe 2+ , Cu 2+ , and Rb + on phoxim poisoning might be due to their enhancement of superoxide dismutase (SOD), catalase (CAT), and carboxylesterase (CarE) in the hemolymph and fat body of silkworm. This enhancement might reduce reactive oxygen species (ROS) accumulation and oxidative stress (OS) caused by phoxim poisoning. Thereby it reduced the damage to silkworm tissues and cells. Conclusions These results showed that Fe 2+ , Cu 2+ , and Rb + treatments protected the silkworm from phoxim poisoning by directly enhancing the activity of SOD, CAT, and CarE enzymes and reducing oxidative stress, but not dependent on the high expression of CYP genes. The use of Fe 2+ , Cu 2+ , and Rb + to enhance the activity of SOD, CAT, and CarE enzymes may be an underlying effective way to solve phoxim poisoning in the silkworm industry.
研究领域:
昆虫学
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毒理学
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农业
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DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Hong Zhu,Jun-Hu Cheng,Ji Ma,Da-Wen Sun
An effective method based on Fe 2+ assisted cold plasma (CP) to pretreat pineapple peel cellulose for the preparation of cellulose nanofibrils (CNF) was proposed in this study. The mechanism underlying Fe 2+ assisted CP pretreatment based on the structural changes of cellulose was investigated. Results showed that the cellulose preabsorbed Fe 2+ , followed by 60 min of CP treatment, and then was nanofibrillated into CNF via ultrasonication. Fe 2+ assisted CP treatment exhibited strong capacity to significantly decrease the degree of polymerization of cellulose and to enhance electrostatic repulsion of fibrils. Furthermore, the roughness and breakage were observed on the surface of pretreated cellulose. The content of inter-molecular hydrogen bonds and average crystallite size (D hkl ) also decreased significantly. The current results provided useful fundamental insights into Fe 2+ assisted CP and cellulose interaction, which should be beneficial to developing new pretreatment methods for disintegrating cellulose into CNF.
研究领域:
材料科学
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生物化学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Weijie Hua,Yong Kang,Huixin Yuan
The effective and rapid treatment of emerging pollutants in water is an essential solution to the pollution of water environment. The emerging pollutant-malachite green (MG) wastewater was treated using pulsed discharge plasma on water surface system (WSP) combining Fe 2+ /PMS. Compared with WSP alone, the addition of 125 μM Fe 2+ and 0.5 mM peroxymonosulfate (PMS) in WSP could enhance the degradation efficiency and energy efficiency of MG by 32.8% and 9.7% respectively, with the synergistic factor of up to 2.056. UV–Vis absorption spectra and mineralization further demonstrated the synergistic effect. When the peak voltage and air flow rate were 22 kV and 0.7 L/min, the degradation efficiency and kinetic constant of MG could reach 97.9% and 0.259 min −1 , respectively. MG degradation with high conductivity (1000 μS/cm) by WSP + Fe 2+ /PMS not only exhibited the better purification effect, but also could maintain the faster reaction rate. The active species involved in the degradation of MG in WSP + Fe 2+ /PMS system were mainly ·OH, SO 4 · − , O 2 · − and e* − . Furthermore, H 2 O 2 and O 3 also have a certain oxidizing effect on MG. Cl − , SO 4 2− , HCO 3 − and humic acid (HA) could inhibit MG degradation to some extent, but still removed more than 80% of MG in water. The WSP + Fe 2+ /PMS reaction system was suitable for the treatment of other emerging pollutants in water. The results of LC-MS analysis revealed that the N-demethylation reaction and decomposition of conjugated structure were the important pathways for MG degradation. The H 2 O 2 and acidic liquid environment provided by WSP laid the foundation for the formation of Fenton, and the introduced Fe 2+ could fully undergo the Fenton and activation reaction with H 2 O 2 and a small amount of PMS in the liquid phase, which enhanced the generation of active species, especially · OH.
研究领域:
环境科学
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水处理技术
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Ruipeng Shen,Min Li,Shuo Wang,Yu-Mo Zhang,Sean Xiao-An Zhang
Based on the dynamic coordination and dissociation of a leuco dye and Fe2+/Fe3+, we constructed an electrochromic system where the coloring unit and redox unit were separate. This electrochromic system combined the advantages of the stability of the metal ions and the color adjustability of the dyes. The electrochromic mechanism was found to be universal to multiple leuco dyes and the device showed an absorption change of 0.25 and a coloration efficiency of 192 cm2 C−1. Moreover, compared with our previous work, the cycle life was effectively improved (up to 4900 cycles), which was suspected to result from the smaller oxidizing potential of Fe2+. This approach to improve the cycle life of electrochromic devices may inspire further important results in the future.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Chengbo Bai,Yuhan Zhang,Qiong Liu,Chengxin Zhu,Jun Li,Rong Chen
To address the observed decrease in efficiency during Fe 2+ -mediated persulfate (PDS) activation caused by slow electron transfer rates and challenges in cycling between Fe 3+ /Fe 2+ states, we devised a strategy to establish interfacial complexation between Fe 3+ and Bi 2 MoO 6 in the presence of PDS. The proposed approach facilitates more efficient capture of photogenerated electrons, thereby accelerating the rate-limiting reduction process of the Fe 3+ /Fe 2+ cycle under visible light irradiation and promoting PDS activation. The Bi 2 MoO 6 /Fe 3+ /PDS/Vis system demonstrates complete degradation of organic pollutants, including Atrazine (ATZ), carbamazepine (CBZ), bisphenol A (BPA), and 2,4-dichlorophenol (DCP) at a concentration of 10 mg/L within a rapid reaction time of 30 min. Radical scavenging experiments and electron paramagnetic resonance spectra (EPR) confirm that the sulfate radical (•SO 4 − ) is the dominant species responsible for organic contaminant degradation. The real-time conversion process between Fe 3+ and Fe 2+ was monitored by observing changes in iron species forms and concentrations within the reaction system. X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy verify the formation of a complexation between Fe 3+ and Bi 2 MoO 6 , facilitating anchoring of Fe 3+ onto material surface. Based on these findings, we propose a reliable mechanism for the activation reaction. This work presents a promising heterogeneous PDS activation method based on Fe 3+ /Fe 2+ cycle for water treatment.
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
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yangchen Zhu,Fei Wang,Beihai Zhou,Huilun Chen,Rongfang Yuan,Yiyue Zhang,HuanHuan Geng,Yuxin Liu,Hao Wang
Sulfadiazine (SDZ) entering the environment has an adverse impact on animal, plant, and human health, it is important to find effective ways to remove SDZ from the aquatic environment. This work comprehensively explored the degradation of SDZ by MoS 2 in photocatalysis and Fe 2+ activation of potassium peroxodisulfate (PDS) from both theoretical and experimental aspects. The PDS/Fe 2+ /MoS 2 system had a faster PDS conversion rate and a higher degradation efficiency for SDZ compared with PDS/Fe 2+ and PDS/MoS 2 . The degradation rate of the PDS/Fe 2+ /MoS 2 system to SDZ reached 97.1% within 60 mins. The degradation rate is higher under acidic conditions compared with alkaline conditions. Free radical capture experiments and EPR tests showed that the degradation of SDZ was the result of a variety of free radicals, among which the SO 4 · − , 1 O 2 and h + played a major role. The chemical morphology and composition of MoS 2 , as well as the changes in the concentration of Fe ions in different valence states were explored and the changes in the O-O and, S-O bond lengths, and differential charge density of PDS in the MoS 2 and, Fe 2+ /MoS 2 systems were calculated by DFT. The results showed that both MoS 2 and Fe 2+ significantly increased the conversion rate of PDS. The activation of PDS on the Fe-modified MoS 2 surface had stronger active sites. MoS 2 can promote the cycle of Fe 3+ /Fe 2+ and the conversion of PDS. According to the intermediate products measured by LC-MS/MS, as well as the frontier molecular orbitals and Fukui function diagrams of SDZ and SDZ* calculated by quantum chemistry, four degradation paths of SDZ were speculated and confirmed the existence of the self-sensitized photodegradation process of SDZ in the system.
研究领域:
环境科学
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化学工程
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理论化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）