FUEL
·
2019
·
IF 5.128
Xiaowei Bai,Jian Li,Chenxi Jia,Jingai Shao,Qing Yang,Yingquan Chen,Haiping Yang,Xianhua Wang,Hanping Chen
In this study, a new-type of Na/Fe solid acid catalyst was synthesized to achieve efficient conversion of cellulose into furfural. The influence of Na/Fe mass ratios (0.05–2%), pyrolysis temperature (350–750 °C), and catalyst to cellulose ratio (0.2:1–20:1) was investigated through pyrolysis–gas chromatography/mass spectrometry (Py-GC/MS), and the structure of Na/Fe catalyst was characterized with various approaches. Through scanning electron microscopy (SEM), the morphologies of the catalysts were found to exhibit rod-like, prismatic, spherical, and amorphous shapes with increasing Na/Fe. The results indicated that the selectivity of furfural increased with increasing Na/Fe ratio, and reached the highest value (61.4%) at a Na/Fe ratio of 1.42, after which it decreased with further increases in the Na/Fe ratio. Higher temperature and higher catalyst to biomass ratio are favorable for furfural formation, but exceedingly high temperature and catalyst to biomass ratio inhibit its formation. The maximum furfural yield could be achieved at 550 °C and catalyst to cellulose ratio of 10. The proposed catalytic pathway of cellulose pyrolysis for furfural is the promotion of the conversion of glucose monomers into dehydrated sugars such as LGO and DGP, which undergo secondary cracking to form furfural.
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高影响因子
Nanoscale
·
2019
·Vol. 11
·期 41
·19506-19511
·
IF 6.97
Ying Li,Tong Liu,Wenxiu Yang,Zhijun Zhu,Yanling Zhai,Wenling Gu,Chengzhou Zhu
Non-Pt catalysts with excellent performance regarding the oxygen reduction reaction (ORR) have aroused enormous interest in recent years. Herein, we propose a dual-template method to synthesize a multiscale porous Fe–N–C (FeNC) catalyst. SiO2 and Zn are used as co-templates to produce a multiscale porous structure. Chitosan and glutaraldehyde are used as building blocks to fabricate the frameworks of the hydrogel. After lyophilization and annealing treatments, FeNC aerogel with a multiscale porous structure could be obtained. The as-prepared FeNC catalyst annealed at 900 °C (FeNC-900) exhibits a larger electrochemically active surface area and an improved ORR activity compared to FeNC annealed at other temperatures. FeNC-900 shows a superior ORR performance in comparison with that of commercial Pt/C in terms of the onset potential and half-wave potential, i.e., 0.959 and 0.837 V, which are 28 mV and 10 mV higher than those of Pt/C, respectively. Multiscale porosity is responsible for the outstanding ORR performance of FeNC-900. The electron transfer number of FeNC-900 for the ORR was calculated to be 3.95, which is comparable with that of Pt/C. In addition, the FeNC-900 catalyst possesses an excellent long-term duration and anti-poisoning capacity against methanol crossover. All these results endow the FeNC catalyst with tremendous potential for use in fuel cells.
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 5
·2943-2952
·
IF 3.108
Jia Yang,Xiaojun Niu,Shaorong An,Weiyi Chen,Jie Wang,Wei Liu
A novel Bi2MoO6–MIL-100(Fe) heterostructure photocatalyst was synthesized by a facile solvothermal method for the first time, and characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectra, transmission electron microscopy, and photoluminescence spectra. The as-prepared Bi2MoO6–MIL-100(Fe) composites exhibited excellent photocatalytic activity and stability towards the degradation of Rhodamine B (RhB) under visible light irradiation. The introduction of MIL-100(Fe) into semiconductor Bi2MoO6 improved the photocatalytic performance remarkably, and the optimal composite with 9% MIL-100(Fe) content showed the highest photocatalytic activity. According to the active radical trapping experiments, the h+ and ˙O2− radicals were the two main active species in the photocatalytic reaction. The enhanced photocatalytic performance is mainly attributed to the formation of the Bi2MoO6–MIL-100(Fe) heterostructure, which is beneficial to the transfer and separation of photo-generated electron–hole pairs. The possible mechanism of the enhanced photocatalytic performance of the Bi2MoO6–MIL-100(Fe) composites was discussed.
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高影响因子
WATER RESEARCH
·
2020
·
IF 9.13
Panxin Wang,Xu He,Wei Zhang,Jun Ma,Jin Jiang,Zhuangsong Huang,Haijun Cheng,Suyan Pang,Yang Zhou,Xuedong Zhai
As a common animal feed additive, p-arsanilic acid (p-AsA) is thought to be excreted with little uptake and unchanged chemical structure, threatening the environment by potentially releasing more toxic inorganic arsenic. We herein investigated the removal of arsenic by in situ formed ferric (oxyhydr)oxides with the promotion of p-AsA degradation in Fe(II)/peroxydisulfate (PDS) system. Results showed that under acid conditions, p-AsA degraded very quickly and over 99% of p-AsA (5 μM) was degraded within 10 min at the optimal dosage of Fe(II) (100 μM) and PDS (150 μM) at pH 3, while less than 66.4% of arsenic was removed at pH 3–5. Higher pH (3–7) would inhibit the degradation of p-AsA but promote the arsenic removal. At pH 6–7, over 98.5% of total arsenic was removed, while the degradation efficiency of p-AsA was lower than 52.4%. HPLC-ICP-MS results indicated that the arsenic group was cleaved from p-AsA in the form of As(III) and then rapidly oxidized to As(V). FTIR and XPS analysis indicated that both As(V) products and residual p-AsA were bonded to ferric (oxyhydr)oxides via hydroxyl groups. Common cations (e.g., Na + , Ca 2+ , Mg 2+ ) and anions such as Cl − , SO 4 2− , CO 3 2− had no significant influence on arsenic removal, while SiO 3 2− , PO 4 3− and HA inhibited the removal of total arsenic, mainly by affecting the zeta potential of iron particles. In summary, the Fe(II)/PDS process, as an efficient method for partial oxidation and simultaneous adsorption of p-AsA under near-neutral conditions, is expected to control the potential environmental risks of p-AsA.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 9
·090512
·
IF 4.316
Yuebing Wang,Dunpeng Yang,Aling Chen,Qingfeng Yi
The development of an efficient, stable and low-cost cathode catalyst is necessary for the practical application of Zn-air batteries. In this paper, Fe3+/Co2+ ions were in situ incorporated into polydopamine during the polymerization of dopamine on the surface of the SiO2 spheres. After subsequent pyrolysis and leaching SiO2, the products loaded with different metals (NHCS-Fe, NHCS-Co, NHCS-Fe1Co0.6, NHCS-Fe1Co4, NHCS-Fe1Co10) were obtained. The samples possess a typical hollow carbon sphere (HCS) structure and show efficient oxygen reduction reaction (ORR) performance under neutral and alkaline conditions. Especially in the neutral electrolyte, the NHCS-Fe exhibits the comparable electrochemical catalytic activity to the commercial Pt/C. For NHCS-Fe, its ORR half-wave potential in neutral and alkaline media is 0.78 V and 0.83 V respectively. Corresponding neutral Zn-air battery reveals a maximum power density of 118.8 mW·cm−2, while they are respective 0.82 V and 46.99 mW·cm−2 for Pt/C. Alkaline Zn-air battery with NHCS-Fe releases a maximum power density of 262.4 mW·cm−2, displaying superior performance to Pt/C. Our work is instructive for the synthesis of novel ORR catalysts with outstanding activity by a versatile synthesis strategy.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Shengji Wu,Menglin Lin,Xijie Cheng,Xuyan Zhao,Fan Yang,Ying Xie,Lei Che,Lijiang Hu,Wei Yang
Electrocatalytic nitrate reduction (NO 3 RR) process presents a green and sustainable approach for mitigating environmental nitrate pollution while enabling ambient NH 3 synthesis. However, it was hindered by the challenge of developing non-noble electrodes that exhibited both high activity and low cost. Herein, iron and copper-doped ZIF-8 electrocatalysts (FeCuO x @CN) with varying Fe/Cu molar ratios (Fe/Cu = 2/1, 1/1 and 1/2) were synthesized. The process involved doping iron into the ZIF-8 precursor, followed by pyrolysis at 700, 800 or 900°C to embed copper with ZIF-8. Synergistic effects between Fe and Cu were observed in the FeCuO x @CN catalysts and an appropriate molar ratio of Fe/Cu was found to effectively balance the reduction rates of NO 3 – and NO 2 – , leading to a high NH 3 yield rate. Among the synthesized catalysts, Fe 1 Cu 2 O x @CN-800 exhibited the best NO 3 RR performance, achieving an NH 3 yield rate of 1975.4 μg h −1 mg cat -1 and a faradaic efficiency of 98.3 % at −0.6 V ( vs. RHE). Furthermore, it exhibited excellent cycling stability, maintaining a faradaic efficiency above 96 % over 20 cycles. The NO 3 RR mechanism over Fe 1 Cu 2 O x @CN-800 was determined to be proceeded with a sequence of deoxygenation steps: NO 3 – → *NO 3 → *NO 2 → *NO → *NOH → *NH 2 O → *NH 2 OH → *NH 2 → *NH 3 .
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Hao Lu,Lu Huang,Jingle Chen,Mingfeng Sun,Liguang Wu,Ting Wang
To address the efficient separation of refractory small-molecule pollutants such as p -nitrophenol (PNP) from industrial wastewater, bimetallic Co-Fe hydroxide nanoparticles were synthesized via a reverse microemulsion method and incorporated into polymer matrices. Initial studies on hybrid membranes with polyvinylidene fluoride (PVDF) matrices demonstrated enhanced hydrophilicity (contact angle reduction from 77.7° to 64.9°) and antifouling performance (85 % flux recovery rate), but their large pore size (∼70 nm) limited PNP rejection (22.5 %). To overcome this problem, polysulfone (PSF) was selected as an alternative matrix substrate. By systematically adjusting the film-forming time (15–50 min) during phase inversion, tight ultrafiltration membranes with controlled pore structures were fabricated. Prolonged film-forming time (30 min) optimized the solvent-nonsolvent exchange kinetics of the obtained PSF-3 membrane, yielding a dense selective layer with a narrow pore size distribution (3–8 nm) and molecular weight cut-off. This membrane achieved a PNP rejection rate of 71 % compared to 5 % of the PVDF membrane through synergistic "size sieving-hydroxyl adsorption" while maintaining low salt rejection (<15 %) and high flux stability (<15 % flux decline rate over 6 h). Hydrophilicity (49.6° contact angle) and antifouling performance (85 % flux recovery rate after four cycles) were significantly enhanced by uniformly dispersed nanoparticles. This study highlights the critical role of film-forming time in tailoring membrane architecture and performance, providing a novel strategy for efficient small-molecule separation from saline wastewater.
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高影响因子
Biomaterials Science
·
2025
·
IF 5.7
Di Zhang,Luying Zeng,Xiangyu Chen,Shuiqing Zhou,Binghong Luo,Mingxian Liu
Atopic dermatitis is a typical chronic inflammatory disease with pathological characteristics of persistent immune activation and oxidative stress. The combined anti-inflammatory and antioxidant treatment can effectively block the inflammatory cascade while reducing oxidative damage. Halloysite nanotubes (HNTs) are the main component of the traditional Chinese medicine "Chishizhi", which shows the medicinal functions of astringency, hemostasis and astringency. However, the efficacy of HNTs alone in treating diseases is relatively weak, and its therapeutic effect can be improved by surface modification and drug loading. Herein, CuO-Fe3O4 nanoparticles were synthesized on the outer surfaces of HNTs by hydrothermal reaction. CuO-Fe3O4@HNTs has high SOD and CAT enzyme activities under neutral condition. Then, the nanozyme modified HNTs powder was prepared into sprayable hydrogels by introduction of sodium alginate (SA) and aloe vera extracts. Cell experiments confirmed that the hydrogel can promote HacaT cell proliferation within 0~200 μg/mL concentration. Through the mouse animal dermatitis model, CuO-Fe3O4@HNTs-SA composite hydrogel has a good therapeutic effect on atopic dermatitis. Comparing with the positive drug halcinonide solution, the CuO-Fe3O4 nanozymes incorporated hydrogel showed enhanced therapeutic effect, which shows promising prospects in the clinical treatment of atopic dermatitis.
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PubMed
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Yongzhi Tu,Ziming Zhang,Peien Huang,Jiale Zou,Zhi Xiong,Meiting Zheng,Zhifei Ma,Jianxin Chen
Unlike conventional Fe₃O₄-MnO₂ composites, an architecture-engineered Fe₃O₄-MnO₂ (FM-21) heterostructure was constructed by anchoring Fe₃O₄ nanoparticles onto α-MnO₂ nanorods. Under visible light irradiation, the FM-21/PDS system achieves 96.5 % Orange II degradation within 60 min with a kinetic rate constant of 0.0596 min −1 , significantly outperforming its individual components and dark condition controls. Multiple characterization techniques confirm that the unique interfacial configuration establishes a direct Z-scheme charge transfer pathway, substantially enhancing charge carrier separation efficiency. XPS analysis provides direct evidence that visible light accelerates the co-cycling of Fe 3+ /Fe 2+ and Mn 4+ /Mn 3+ redox pairs, thereby maintaining highly efficient PDS activation. Quenching experiments and EPR analysis further reveal that the synergistic effect between radical and non-radical pathways, which is dominated by singlet oxygen ( 1 O₂) and holes (h + ), drives the degradation process. This mechanism enables the degradation of various pollutants with minimal dependence on their charge characteristics, demonstrating the catalyst's broad applicability. The catalyst also exhibits practical advantages including magnetic separability and stable performance over five consecutive cycles. This study demonstrates that the synthesized FM-21 exhibits significant potential for visible light-enhanced PDS activation in eliminating recalcitrant organic pollutants.
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高影响因子
CARBON
·
2025
·
IF 11.6
Bing Qian,Ting Liu,Zhaolu Pu,Ruiqi Wang,Chengqin Pan,Yulong Sun,Zhixiang Wang,Yanhong Yin,Xianbin Liu,Ziping Wu
Rechargeable zinc-air batteries (ZABs) hold great potential in next-generation sustainable energy storage because of their high energy density, safety, and environmental friendliness. Nevertheless, the sluggish kinetics of the air cathode hinder their energy efficiency and cycling stability. Herein, we report a bridging strategy to fabricate a free-standing air cathode (NCNTs-Fe/CMF), consisting of the crosslinked and interconnected Fe nanoparticles (NPs) encapsulated on the N-doped carbon nanotubes (NCNTs-Fe), which are tightly bound to a carbon nanotube macro film (Fe/CMF) substrate to activate Fe NPs sites. The bridging effect of NCNTs-Fe/CMF endows excellent interfacial contact, a large specific surface area, and high electrical conductivity, accelerating electron transfer and promoting oxygen mass transfer/diffusion. In addition, the synergy between activated Fe NPs and N-doping enriches abundant nitrogen species, further facilitating the electrocatalytic process. As a result, the NCNTs-Fe/CMF exhibits excellent bifunctional catalytic activity, featuring a half-wave potential of 0.88 V and an overpotential of 340 mV at 10 mA cm -2 . Furthermore, the assembled rechargeable ZAB based on the NCNTs-Fe/CMF air cathode delivers a satisfactory power density of 130.0 mW cm -2 and outstanding cycling durability up to 200 h at 5 mA cm -2 . This work provides a bridging design strategy for developing highly efficient and stable free-standing air electrodes.
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高影响因子
LANGMUIR
·
2025
·
IF 3.9
Shijiang Feng,Rong Qiang,Yulong Shao,Lei Rong,Fangjie Ren,Na Xiao,Siyuan Zhang,Zheng Guo,Caihong Chen,Qing Miao
The construction of hollow structures and the incorporation of metal nanoparticles have been shown to be two potential approaches to achieving high-performance microwave absorption. In this study, a hollow polyhedron material featuring an FeN/Fe-doped carbon matrix was synthesized by an acidification corrosion and pyrolysis strategy. The formation of heterojunctions, coupled with the design of hollow structures, significantly improved the dielectric loss capacity of the material. Furthermore, the incorporation of magnetic metal nanoparticles not only increased the magnetic loss but also enriched the loss mechanisms of the material, leading to an overall improvement in the magnetic loss. Under the synergistic effects of these factors, the material exhibited exceptional microwave absorption properties. In particular, at a material thickness of only 2.3 mm, the minimum reflection loss value of the FeN/Fe@HC nanocomposite reached −64.5 dB with an effective absorption bandwidth of 5.1 GHz. These results further highlight the importance of a hollow structure design and metal atom doping in improving microwave absorption performance.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jian Sun,Haobo Ma,Jiafei Ren,Xia Han,Juan Liu
The practical application of photo-Fenton processes to degrade contaminants is limited by their poor stability under varying pH environment. The requirement of supplementary oxidants and iron additives increase the cost. This reports the construction of Z-scheme heterojunction with Fe coordinatively unsaturated metal sites (Fe CUMSs) based on g-C 3 N 4 as the highly efficient photo-Fenton catalysts. The optimized catalyst presented stable MB degradation efficiency of 115.32 mg g −1 (pH 4.0), 113.44 mg g −1 (pH 7.0), and 106.35 mg g −1 (pH 9.0) in 30 mins without any oxidants and iron-containing additives. The self-feeding photo-Fenton mechanism was studied in details, suggesting that Fe CUMSs improved the H 2 O 2 generation rate of g-C 3 N 4 to 6.23 μmol L −1 h −1 . A completely reversible Fe 2+ /Fe 3+ conversion process lead to persistent generation of hydroxyl radical to degrade MB without iron precipitation generation. This work presents a new strategy constructing self-feeding photo-Fenton catalytical system to remove contaminants for environmental remediation and sustainability.
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高影响因子
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