Water
·
2023
·Vol. 15
·期 9
·1680
·
IF 3.4
Yuxin Jiang,Xihua Cao,Fang Li,Xiuxian Song
Antibiotics have been identified as emerging pollutants, and they increasingly threaten the safety of mariculture; thus, effective treatment methods are urgently needed. In this study, Fe(II)-peroxymonosulfate-modified clay (Fe-PMS-MC), an effective mineral complex for harmful algal bloom control, was tested for sulfamethoxazole (SMX) removal from seawater. The results showed that SMX removal efficiency increased gradually from 42.3% to 100% in seawater in 6 h as the Fe-PMS-MC dose increased from 0.1 g/L to 1.0 g/L; this removal was more efficient than that in freshwater. Both an increase in temperature and the addition of inorganic anions such as Cl−, HCO3−, and SO42−improved the SMX removal efficiency; in contrast, there was no noticeable influence of a pH change from 3.0 to 9.0 or ofHeterosigma akashiwobiomass addition from 103cells/mL to 105cells/mL. Oxidation was the main mechanism for the removal of SMX by Fe-PMS-MC treatment, and the mechanisms included radical oxidation and non-radical oxidation. PMS was the key component in Fe-PMS-MC for the production of radicals, which increased with temperature. Similarly, both radical oxidation and non-radical oxidation increased when PMS was attacked by Cl−, HCO3−, and SO42−in seawater.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Xuelian Xia,Weifeng Yue,Yuanzheng Zhai,Yanguo Teng
Hyporheic zone (HZ) systems have a natural purification capacity, and they are commonly used to provide high quality drinking water . However, the presence of organic contaminants in HZ systems in anaerobic environments causes the aquifer sediments to release metals (e.g., Fe) at levels above drinking water standards, which affects the quality of groundwater. In this study, the effects of typical organic pollutants (dissolved organic matter (DOM)) on Fe release from anaerobic HZ sediments were investigated. Ultraviolet fluorescence spectroscopy , three-dimensional excitation-emission matrix fluorescence spectroscopy, excitation–emission matrix spectroscopy coupled with parallel factor analysis and Illumina MiSeq high-throughput sequencing were used to determine the effects of the system conditions on Fe release from HZ sediments. Compared with the control conditions (low traffic and low DOM as a baseline), the Fe release capacity was enhanced by 26.7 % and 64.4 % at low flow rate (85.8 m/d) and high organic matter concentration (1200 mg/L), which was consistent with the residence-time effect. The transport of heavy metals under different system conditions varied with the influent organic composition. The influent organic matter composition and fluorescence parameters (the humification index, biological index and fluorescence index) were closely related to the release of the Fe effluent, while these factors had less influence on Mn and As. From 16S rRNA analysis of the aquifer media at different depths at the end of the experiment, under low flow rate and high influent concentration conditions, reduction of Fe minerals by Proteobacteria , Actinobacteriota , Bacillus , and Acidobacteria promoted the release of Fe. These functional microbes play an active role in the Fe biogeochemical cycle in addition to reducing Fe minerals to promote Fe release. In summary, this study reveals the effects of the flow rate and influent DOM concentration on the release and biogeochemistry of Fe in the HZ. The results presented herein will contribute to a better understanding of the release and transport of common groundwater contaminants in the HZ and other groundwater recharge environments.
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PubMed
高影响因子
Journal of Pharmaceutical Analysis
·
2023
·
IF 8.8
Si-Yu Gui,Xin-Chen Wang,Zhi-Hao Huang,Mei-Mei Li,Jia-Hao Wang,Si-Yin Gui,Gan-Hua Zhang,Yao Lu,Li-Ming Tao,Hai-Sheng Qian,Zheng-Xuan Jiang
Diabetic retinopathy (DR) is a prevalent microvascular complication of diabetes and the leading cause of blindness and severe visual impairment in adults. The high levels of glucose trigger multiple intracellular oxidative stress pathways, such as POLDIP2, resulting in excessive reactive oxygen species (ROS) production and increased expression of VCAM-1, HIF-1α, and VEGF, causing microvascular dysfunction. Dihydromyricetin (DMY) is a natural flavonoid small molecule antioxidant. However, it exhibits poor solubility in physiological environments, has a short half-life in vivo, and has low oral bioavailability. In this study, we present, for the first time, the synthesis of ultra-small Fe-DMY nano-coordinated polymer particles (Fe-DMY NCPs), formed by combining DMY with low-toxicity iron ions. In vitro and in vivo experiments confirm that Fe-DMY NCPs alleviate oxidative stress-induced damage to vascular endothelial cells by high glucose, scavenge excess ROS, and improve pathological features of DR, such as retinal vascular leakage and neovascularization. Mechanistic validation indicates that Fe-DMY NCPs can inhibit the activation of the Poldip2-Nox4-H 2 O 2 signaling pathway and downregulate vital vascular function indicators such as VCAM-1, HIF-1α, and VEGF. These findings suggest that Fe-DMY NCPs could serve as a safe and effective antioxidant and microangio-protective agent, with the potential as a novel multimeric drug for DR therapy.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Siqi Huang,Yong Zhang,Bingyu Mei,Xiaoyu Tian,Wenkun Zhu,Jun Liao,Nan Sun
The mesoporous Si-Fe-GO composite was prepared by sol–gel method to remove uranium. In the static adsorption process, the Si-Fe-GO composite possessed strong uranium-chelating ability with fast uranium adsorption kinetic (120 min) and high uranium adsorption capacity (576.4 mg/g). The adsorption behavior perfectly followed the pseudo-second-order kinetic and Langmuir isotherm models, revealing the nature of monolayer chemical adsorption. The tolerance experiments of coexisting ions showed that the Si-Fe-GO composite possessed a strong affinity for uranium, which was beneficial for the enrichment of uranium in a multi-component wastewater system. The good regeneration ability also reflected the practical application value of the Si-Fe-GO composite. Besides, the dynamic adsorption studies showed that the Si-Fe-GO composite might be suitable for the remediation of uranium-containing wastewater with low flow rate and low uranium concentration. In conclusion, this work would contribute to the development of functional SiO 2 materials for water remediation and meet the practical requirements for the cleanup of uranium from wastewater.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2023
·Vol. 37
·期 6
·e7098
·
IF 3.9
Tao Chen,Xiangning Jiang,Ning Zhao,Mehar U. Nisa,Zhenhua Li
Fischer–Tropsch synthesis (FTS) is an essential technology to produce clean fuel, and catalyst will affect syngas conversion efficiency and product distribution. For traditional oxides-supported catalysts, the mutual constraint between active metal loading and dispersion at high metal loading is hard to overcome, which will hinder the synthesis of high-performance FTS catalysts. Herein, we report an efficient method for synthesizing iron-based catalysts with not only high loading but also high dispersion. By using metal–organic frameworks Fe-MIL-88B as the precursor, we synthesized a series of Fe@C@SiO 2 catalysts by tuning the amount of tetraethyl orthosilicate (TEOS) through a one-step method; TEOS was in situ introduced and followed by high-temperature carbonization. The prepared catalyst possesses a Fe@C core–shell structure with carbon layer encapsulation. Meanwhile, the SiO 2 in the catalyst can effectively confine iron particles and avoid the agglomeration of iron species during high-temperature carbonization. Among these catalysts, the Fe@C@SiO 2 -0.005 showed the greatest FTS performance because high iron dispersion was achieved at high iron loading. Further increase SiO 2 content enhanced the confinement effect of SiO 2 but generated inert Fe 2 SiO 4 species, which decreased the adsorption and activation of reactants and FTS activity.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yuan Shu,Tingkai Zhao,Yatao Li,Lei Yang,Xianghong Li,Guyue Feng,Weiyu Jia,Fa Luo
Electromagnetic wave absorbers composed of reduced graphene oxide (RGO) and magnetic nanoparticles integrates dielectric and magnetic loss features, which is extremely desirable for enhancing electromagnetic wave absorption ability. Here, porous Fe/FeO/Fe 2 O 3 nanorods/RGO composites (FFORGO) are synthesized via anchoring FeO(OH) nanorods on graphene oxide (GO) through dopamine polymerization followed by thermal reduction treatment. The porous Fe/FeO/Fe 2 O 3 nanorods are anchored on RGO, and crosslinked structure formed in FFORGO composites when the GO addition is higher than 5 mg‧ml −1 . The abundant active sites (e.g., functional groups, dangling bonds, and lattice defects), the numerous heterointerfaces (among Fe, FeO, Fe 2 O 3 and RGO) and crosslinked structure trigger multiple dipole polarization, interface polarization and enhanced conductive loss. The EM wave absorption property is optimized by tuning the GO addition. FORGO4 with filler loading of 30 wt% achieves the maximal reflection loss of −24.1 dB at a thickness of 1.9 mm and the effective bandwidth below −10 dB of 3.01 GHz with a thickness of 2.2 mm, owing to the proper ratio of Fe/FeO/Fe 2 O 3 nanorods/RGO and synergistic effect between dielectric loss (dipole polarization, interface polarization, conductive loss) and magnetic loss (eddy current loss and exchange resonance). With the filler loading of 35 wt%, the maximal reflection loss of FFORGO4 is −50.7 dB at a thickness of 1.7 mm and the effective bandwidth reaches to 3.74 GHz at a thickness of 1.8 mm.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2023
·
IF 5.8
Cijun Shuai,Xuan Chen,Chongxian He,Min Chen,Shuping Peng,Wenjing Yang
Ascorbic acid (AA) is a promising antitumor agent, yet its autooxidation is too slow which constrains the further application. Fortunately, the autoxidation process can be accelerated by transition metal catalysts , especially Fe 3+ ions. In this study, AA was loaded to Fe-doped mesoporous silica (designated as [email protected] 2 ), which was introduced into poly- L -lactic acid (PLLA) and then prepared into a scaffold. Mechanistically, [email protected] 2 degraded in acidic tumor microenvironment because excessive H + substituted Fe atoms in the iron silicate framework, releasing Fe 3+ and AA. The Fe 3+ boosted the pro-oxidation reaction of AA, generating numerous hydrogen peroxide (H 2 O 2 ) and Fe 2+ . Then, Fe 2+ reacted with H 2 O 2 to initiate Fenton reactions favoring hydroxyl radical generation, triggering oxidative damage on tumor cells to implement tumor-specific therapy. Results showed that the release amount of AA in acidic solution was about 3 times higher than that in neutral solution, which was attributed to the pH-dependency of the degradation of [email protected] 2 in scaffold. Furthermore, the scaffold generated numerous ascorbate radical intermediate and increased the H 2 O 2 concentration by 120.2%, demonstrating that Fe 3+ remarkably accelerated the oxidation rate of AA. Cell experimental results showed that the scaffold caused massive apoptosis of tumor cells, while no obvious cytotoxicity to normal cells, confirming the antitumor specificity of scaffold. This work paves a promising way to construct a biodegradable and catalytic scaffold, featuring effective tumor-specific therapy.
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JOURNAL OF MATERIALS RESEARCH
·
2023
·Vol. 38
·期 9
·2359-2368
·
IF 2.7
Ma Junjie,Liu Hangcheng,Tao Zeyu,Liu Jianfeng,Yuan Binxia,Pan Weiguo,Shi Zhengrong
In order to reveal the relationship between the structure and the electrochemical oxygen reduction reaction (ORR) activity of different double transition metal decorated catalysts, three different double transition metal and N co-doped carbon material cathode catalyst materials (FeCo–NC, FeNi–NC and CoNi–NC) were prepared in this study. The FeCo–NC catalysts synthesised in this study still showed high ORR activity under alkaline conditions, with a half-wave potential of 0.783 V RHE , a mass activity (MA) of 11.36 A/g (0.77 V RHE ) and an ultimate current density of − 4.46 mA cm −2 ; after 30,000 cycles, the half-wave potential only decreased to 99.3% of the initial potential. Meanwhile, we employ MS to establish three different double transition metal and N co-doped graphene catalysts and to calculate and analyse their desorption properties, leading to the FeCo–NC material being the model with the highest ORR activity, which is consistent with the experimental results. Graphical Abstract
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yu Feng,Shuang Liang,Jing-bo Zhao
In this work, a new strategy was developed to prepare magnetoceramics through a bulk pyrolysis of novel Fe-containing polyamide preceramic precursors at low pyrolysis temperature. A series of novel polyamides with different chemical structures were synthesized by bulk Michael addition and polycondensation , and their structures were characterized. Polymer precursors (PPs) were prepared by direct melt blending polyamides and FeCl 3 , and polymer-derived ceramics (PDCs) were prepared via the pyrolysis of PPs. The polyamide structure with pendant pyridine groups in repeating units makes the Fe complexes uniformly dispersed in matrix. The relationship between magnetoceramic compositions and PP structures was investigated by TGA , XPS , XRD , FE-SEM, FE-TEM and VSM characterizations. Different chemical structures and Fe catalysis effect lead to different thermal decomposition processes of PPs. Increasing crystal-Fe content in PDCs contributes to higher magnetic properties . The morphology of crystal phases in PDCs relies on the structures of PPs and pyrolysis temperature. Different pyrolysis temperatures and chemical structures of PPs bring about different Fe crystal phases and carbon crystal state of nanosheets or nanofiber bundles.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 13
·6058-6065
·
IF 3.3
Xu Zhang,Jingxian Zhang,Shi Zeng,Haifan Wang,Yiling Bai,Huaming Hou,Ke Zhang,Bin Li,Guangjin Zhang
Iron–nitrogen-doped carbon (Fe–N–C) catalysts have been theoretically and experimentally demonstrated as one of the most promising materials to promote the oxygen reduction reaction (ORR), but they still have drawbacks in terms of stability and longevity. Herein, a novel strategy of loading Fe–N–C on cerium oxide cyanamide (Ce2O2CN2) is proposed to increase the density of active sites and improve the activity effectively. Ce2O2CN2 provides a Ce4+/Ce3+ redox pair to regulate the oxygen density on the catalyst surface, and the π–π interactions between Ce2O2CN2 and Fe–N–C are beneficial for interfacial charge transport. Consequently, Fe–N–C@Ce2O2CN2 shows excellent ORR activity with a half-wave potential (E1/2) of 0.89 V vs RHE and satisfactory long-term durability in an alkaline medium, and significantly outperforms commercial Pt/C. The Zn–air batteries made using the prepared catalyst exhibited a high peak power density of 119.35 mW cm−2. This study provides a new perspective for the application of platinum group-metal (PGM)-free catalysts in next-generation energy storage devices.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jianle Wang,Xueming Liu,Hong Deng,Dongye Zhao,Qiulin Yang,Zhihua Zhu
Various sulfur- and iron-bearing materials have been shown promising for reductive immobilization of Cr(VI) in water and soil. Yet, composite Ca-Fe-S materials and the effects of water chemistry and material aging have not been investigated. In this work, we prepared a type of Ca-Fe-S microparticles under the atmospheric conditions through a facile one-pot approach, and tested the particles for reductive immobilization of Cr(VI) in solution and soil. Ca-Fe-S showed 40 % higher removal efficiency of Cr(VI) in solution than FeSO 4 and 10 % higher than CaS x on the basis of equal molar dosage. When a Cr-laden soil was amended by Ca-Fe-S, the leachable concentration of Cr per the toxicity characteristic leaching procedure remained below the regulatory limit of 5 mg L −1 after 730 days of curing, while FeSO 4 and CaS x failed to meet the regulatory threshold. Ca-Fe-S served as a slow-releasing source of Fe 2+ and S 2- , which were able to convert Cr(VI) into the stable final product of Cr(OH) 3 . Ca-Fe-S was able to perform well under a wide range of pH (3.0–9.0) and in the presence of high concentrations of coexisting ions (5 mmol L −1 of Cl - , SO 4 2- , or HCO 3 - ). Moreover, the material remained effective when aged under the atmospheric conditions for 14 days. This study showed that Ca-Fe-S is a highly effective material for efficient sequestration of Cr(VI) in soil and groundwater under various water chemistry and materials aging conditions.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Mengya Guo,Li Wang,Yuying Gao,Guozhu Li
Doping carbon materials with Fe and N attracts great attention due to its promising application in preparing ORR electrode with high performance and low cost. Previously, Fe, N-codoped catalyst (Fe/N/C) had been synthesized via a simple one-pot method using carbon materials, dopamine and FeCl 3 by our group. However, the unstable activity and low selectivity (electron transfer number of ∼3.5) are key problems that should be solved. Herein, trace sulfur has been introduced into Fe, N-codoped carbon black by using 2-mercaptoethanol as an adhesive sulfur precursor. By the doping of trace S atoms (∼0.25 at%) into Fe, N-codoped carbon frameworks, the ORR performance has been obviously improved simply without any re-treatment process, such as acid-etching or nitrogen supplement. The mechanism of this process has been systematically investigated by changing the amount of initial sulfur precursor. A moderate amount of trace sulfur can effectively enhance the ORR performance of Fe, N-codoped carbon black due to suitable interactions among Fe, N, S and C elements. Both the content and the state of Fe and N species on the surface of carbon black can be changed and controlled by trace sulfur. The as-synthesized 1.0 S Fe/N/C catalyst exhibits a good ORR activity (E 1/2 = 0.749 V, J k = 54.56 mA cm −2 ) and a total 4-electron selectivity. 1.0 S Fe/N/C also shows better catalytic stability and methanol tolerance than 20 wt% Pt/C.
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