CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Xianyu Kang,Wenxiu Hu,Qingchun Ge,Shaohua He
The intrinsic hydrophobicity and electronegative surface charge of polyamide (PA) membranes render them highly susceptible to organic and biological fouling, constraining their efficiency in water treatment. Here, we present a molecularly rational, coordination-driven strategy to construct electropositive PA membranes by grafting a family of betaine-derived quaternary ammonium materials (QAMs) (Bet-1N ⊕ , Bet-2N ⊕ , Bet-4N ⊕ ) via Fe 3+ -mediated interfacial coordination. The single-step-synthesized modifiers provide dense −OH, −COOH and −NMe 3 + functionalities that synergistically increase hydrophilicity, smooth surface morphology, and positive surface charge. Forward-osmosis evaluation shows significant flux enhancements of 142%, 150% and 167% for Bet-1N ⊕ , Bet-2N ⊕ , Bet-4N ⊕ membranes, respectively, relative to pristine PA membranes. Beyond permeability, the membranes, particularly the Bet-4N ⊕ variant, achieves >99% bactericidal efficacy against both E. coli and S. aureus , limits lysozyme-induced flux decline to 25% over 12 h, and recovers 88% of initial flux after hydraulic cleaning (vs. 54% decline and 61% recovery for pristine PA). Mechanistic analysis reveals that a sterically and electrostatically selective Fe-QAM interphase underpins these antifouling advantages. This work establishes a facile and eco-friendly approach for constructing high-performance antifouling membranes, offering broad potential for sustainable water treatment applications.
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高影响因子
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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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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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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PubMed
高影响因子
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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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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高影响因子
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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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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CHEMPHYSCHEM
·
2022
·Vol. 24
·期 7
·e202200505
·
IF 3.52
Xujun Ma,Donghui Wang,Jianan Wu,Bin Zhao,Feng Chen
Graphical Fe 3+ doping was utilized to promote the formation of oxygen vacancies and improve the interaction between TiO 2 and atomic Pt. Single Pt atoms anchored on the oxygen vacancy sites of Fe−TiO 2 effectively modify the local energy band structure of TiO 2 , and thus significantly boost the catalytic performance of either the intrinsic or the sensitized photocatalytic process for Pt/Fe−TiO 2 . Single atomic site catalysts display the maximal atom-utilization efficiency, unique structural properties, and remarkable enhancements on catalytic activity. Herein, single Pt atoms loaded Fe−TiO 2 catalysts were prepared. Fe 3+ doping leads to the formation of oxygen vacancies and improve the interaction between TiO 2 and Pt. Single Pt atoms are thus anchored and effectively modify the local energy band structure of TiO 2 . The optimized local band structures improve the intrinsic photoexcitation of Pt/Fe−TiO 2 , promote the separation of photogenerated carriers, and extend the lifetime of photogenerated carriers. Meanwhile, the electrons transfer from the excited dyes to the conduction band edge of Pt/Fe−TiO 2 is also facilitated due to the shift-down of the conduction band edge. Therefore, with the increase of the Pt content (till up to 0.6 wt%), the photocatalytic performance of Pt/ Fe−TiO 2 with the confined single Pt atoms is significantly boosted in either the intrinsic or the sensitized photocatalytic process.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Junshuang Zhou,Ying Bian,Zhuoran Hao,Kuo Wei,Jiajia Xiao,Jing Wang,Yuanzhe Wang,Huiyang Gou,Faming Gao
Inhibiting the chlorine evolution reaction (CER) is of great significance for the design and development of oxygen evolution catalysts with high current density for seawater electrolysis. The KOH concentration plays a very important role in controlling the potential of chlorine evolution in seawater electrolysis. However, the effect of its concentration, especially the high one (for example, >1 M), on the OER activity of different catalysts has not been studied so far. Here, we found that the KOH concentration has different linear effects on the OER activity for different catalysts, and we first propose a novel concept named concentration activity coefficient (CAC) to express the linear relationship between the OER activity of the catalyst and the KOH concentration in seawater electrolysis. Based on CAC, we report a Co S-NiFe 2 O 4 catalyst with ultrahigh oxygen evolution activity in the 3 M KOH + seawater. This is due to the strong electronic interaction between Co and S-NiFe 2 O 4 . At current densities of 500 mA cm −2 and 1000 mA cm −2 , the overpotentials of Co S-NiFe 2 O 4 are 270 mV, and 287 mV, respectively, which are much lower than those of the existing electrocatalysts . More promising, the new catalysts also showed a splendid Tafel slope of 18.8 mV dec −1 and a long catalytic lifetime in concentrated alkaline electrolyte . Our findings provide a better understanding of the correlation between the KOH concentration and the OER activity and open new avenues for design and development of electrocatalysts for the next generation of high OER activity in seawater electrolysis.
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