ACS Applied Nano Materials
·
2024
·
IF 5.3
Yi Gao,Tingting Chu,Chengyu Zhou,Wensheng Huang,Yin Zheng
In this paper, iron–copper bimetallic nanosheet materials (FeCu/CNS) were prepared using hydrothermal and pyrolysis methods to develop a dual-mode electrochemical and colorimetric sensing platform for detecting acetaminophen (ACM). The glassy carbon electrode (GCE) was modified with FeCu/CNS to enhance its electrocatalytic activity and develop an electrochemical sensor for detecting ACM. The linear range of the sensor was 0.01–7 × 10–6 mol/L, and the detection limit (LOD) was 2.5 × 10–8 mol/L. In addition, FeCu/CNS possesses an efficient peroxidase-like activity that converts colorless 3,3′,5,5′-tetramethylbenzidine (TMB) into a blue oxidized state product (oxTMB) in the presence of H2O2, which exhibits a characteristic absorption peak around 652 nm. However, ACM has reducing properties and can reduce oxTMB to TMB, thereby reducing the intensity of the characteristic absorption peak of oxTMB. Based on this principle, a colorimetric sensor was constructed for the detection of ACM, which had a linear range of 0.5–1625 × 10–6 mol/L and an LOD of 2.63 × 10–6 mol/L. Compared with other single methods, the method exhibited a wider linear range and lower detection limit, confirming the complementary and superior nature of the dual-mode sensor designed in this paper for ACM detection. Meanwhile, the detection of ACM in human serum was also carried out with satisfactory results.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shiyong Wei,Aijia Cao,Siyuan Huang,Yao Shen,Ting Lei,Songmei Luo,Mingjun Cai,Wenjun Xiang,Anying Chen,Rui Wang
Although MIL-100(Fe) was regarded as an ideal material for the environmental remediation, it could not be applied in practical because of the potential eco-environmental risk and cost. In this work, a novelty strategy of liquidizing crystal MIL-100(Fe) was posted for the first time through inhibiting the crystallization process and forming physical MIL-100(Fe) gel. Due to this MIL-100(Fe) sol–gel, MIL-100(Fe) could easy cover on the surface of silica powder (SiO 2 ) through simple soaking operation. MIL-100(Fe) covering on SiO 2 (MIL-100(Fe)@SiO 2 ) could be quickly separated from wastewater spontaneously owing to the carrier of SiO 2 , even in a tank of 2.0 m, which made it possible for purifying wastewater in practical. MIL-100(Fe)@SiO 2 could remove phosphate with a removing ratio of closing 100 % at an initial concentration of 10 mg/L, while more than 95 % towards methyl orange (MO). The removing ratio of MO by MIL-100(Fe)@SiO 2 did not obviously decrease when the concentration of MO increased to 100 mg/L. And the adsorption performance of phosphate did not affect by pH among 3.0–9.0. The adsorption amount exceeded 50 % of maximum adsorption capacity for phosphate within 30 min, while 90 % for MO. Monodentate mononuclear coordination could explain the adsorption of phosphate by MIL-100(Fe)@SiO 2 . The N atom in MO might be acted as Lewis acid to coordinate with MIL-100(Fe)@SiO 2 . After adsorption, the P-saturated and MO-saturated MIL-100(Fe)@SiO 2 could be effectively regenerated by the dilute HCl and NaOH solution, respectively. The recovery ratio of adsorption capacity for phosphate and MO were up to 97.7 % and 71.6 %.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Dongwei Xu,Zhihao Shen,Mingju Zhang,Xinyuan Li,Lu Deng,Yeqi Ren,Biao Zhao,Xiaoqin Guo,Ping Chen
The rational structural design and compositional merits as well as the synergistic coupling effect can break the properties of single material and broaden the microwave absorption band. Herein, the unique lightweight Fe-doped MnO 2 @C hollow nanocubes are rationally designed and successfully synthesized via a scalable wet chemical process and polydopamine coating followed by high-temperature calcination . By virtue of the unique structure and compositional merits, the as-obtained Fe-doped MnO 2 @C hollow nanocubes (Fe–MnO 2 @C-HNBs) displayed notable microwave absorption performance (MAP), simultaneously achieving ultra-broad absorption bandwidth and strong absorption characteristics at a low thickness of 2.3 mm (the reflection loss of −41.02 dB and the effective absorption bandwidth of 5.86 GHz). Surprisingly, the effective absorption bandwidth (RL < −10 dB) could reach up to 8.08 GHz and the minimum reflection loss (RLmin) was −38.20 dB at the thickness of 2.7 mm. The results further confirmed that the excellent microwave attenuation ability of the as-prepared Fe–MnO 2 @C-HNBs composites benefitted from the special “air@core-shell” structure and multiple heterointerfaces as well as multi-component recombination. These results demonstrated that the as-obtained Fe–MnO 2 @C-HNBs composites could be attractive candidates for broadband microwave absorption materials .
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Bangjian Liu,Hong Yang,Huiqing Xu,Quanjie Liu,Shuandi Hou,Anfeng Zhang,Xinwen Guo
Effective regulation of acid sites is essential to strengthen the reaction performance and to modulate product distribution of an isomerization reaction. In this study, ZSM-50 (Al-EUO) and Fe-substituted ZSM-50 zeolites, namely FeAl-EUO-n (n = 0.25, 0.50 and 0.75) and Fe-EUO, are synthesized by a seed-assisted hydrothermal method. The study has shown that Fe has effectively entered the Al-EUO framework as a tetrahedrally-coordinated species. More importantly, the Fe-substitution has resulted in a significant increase in the amount of surface weak- and medium-strength Brönsted acids and a reduction in the strength of strong acids of FeAl-EUO-n. This study also evaluates the catalytic performance of Pt/FeAl-EUO-n catalysts in n-heptane hydroisomerization. It shows that the introduction of Fe in ZSM-50 greatly enhances the isomer yield, achieving a maximum yield of 66.1 % at 320 °C over Pt/FeAl-EUO-0.50 compared to 16.4 % at 300°C over Pt/Al-EUO. At the same time, the fraction of multi-branched iso -heptane also increases noticeably in the reaction product.
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CHEMOSPHERE
·
2017
·
IF 4.208
Xufang Li,Weiyu Chen,Luming Ma,Hongwu Wang,Jinhong Fan
An Fe-based catalyst was used as a heterogeneous catalyst for the ozonation of industrial wastewater , and key operational parameters (pH and catalyst dosage) were studied. The results indicated that the Fe-based catalyst significantly improved the mineralization of organic pollutants in wastewater. TOC (total organic carbon) removal was high, at 78.7%, with a catalyst concentration of 200 g/L, but only 31.6% with ozonation alone. The Fe-based catalyst significantly promoted ozone decomposition by 70% in aqueous solution. Hydroxyl radicals (·OH) were confirmed to be existed directly via EPR (electron paramagnetic resonance) experiments, and ·OH were verified to account for about 34.4% of TOC removal with NaHCO 3 as a radical scavenger. Through characterization by SEM-EDS (field emission scanning electron microscope with energy-dispersive spectrometer), XRD (X-ray powder diffraction) and XPS (X-ray photoelectron spectroscopy), it was deduced that FeOOH on the surface of the catalyst was the dominant contributor to the catalytic efficiency. The catalyst was certified as having good stability and excellent reusability based on 50 successive operations and could be used as a filler simultaneously. Thereby, it is a promising catalyst for practical industrial wastewater advanced treatment.
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PubMed
高影响因子
Catalysis Science & Technology
·
2024
·
IF 4.4
Haixiang Shi,Yiyuan Xu,Tongming Su,Xuan Luo,Xinling Xie,Zuzeng Qin,Hongbing Ji
The surface acidity and structure of catalysts play crucial roles in cinnamaldehyde (CAL) selective hydrogenation to manufacture cinnamyl alcohol (COL). Herein, a Co–Fe-supported acidified bentonite catalyst (Co–Fe/ACBT) was prepared via sulfuric acid treatment of bentonite (BT) and the traditional impregnation method. The combination study, including FT-IR spectra of adsorbed pyridine and ammonia temperature-programmed desorption (NH3-TPD), showed that Co–Fe/ACBT has vast acidic sites mainly originating from surface unsaturated metal sites of ACBT, which prefer to adsorb polar >CO but not nonpolar >CC<. X-ray photoelectron spectroscopy (XPS) verified that the effect of electron transfer was significantly enhanced when the active metal was loaded on ACBT, leading to an increase in the electron cloud density of the Co species, which promoted the activation of >CO. Due to the modified electronic properties of Co species and abundant acidic sites, Co–Fe/ACBT exhibited a 90.5% conversion and 86.8% hydrogenation selectivity from CAL to COL, which are notably greater than those of the Co–Fe-supported bentonite catalyst (32.0% CAL conversion and 66.4% COL selectivity).
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Journal of Environmental Sciences
·
2024
·
IF 5.9
Yuming Huang,Lin Liu,Hang Yang,Huixuan Yi,Xiangyu Li,Linqian Li,Dawei Lu,Qian Liu,Guibin Jiang
Accurately distinguishing between the endogenous formation and exogenous exposure of Fe-bearing particles (e.g., magnetic Fe particles) within biological organisms is the prerequisite for scientifically evaluating their health risks. However, this remains a challenging task due to lacking the comprehensive understanding of the endogenous formation process of Fe-bearing particles. Here, we report the formation dynamics of Fe-bearing particles under conditions closely resembling actual physiological conditions, and compare the morphological and structural differences between endogenous and exogenous Fe-bearing particles. We find that Fe-bearing particles can indeed form under physiological conditions at 37°C. In this process, phosphate plays a crucial role in the oxidation and mineralization of iron ions. Moreover, endogenously formed Fe-bearing particles typically have a diameter of less than 8 nm, and iron is the only metal element present. Therefore, we propose that Fe-bearing particles found in the body with a diameter larger than 8 nm are mainly derived from exogenous exposure. For Fe-bearing particles smaller than 8 nm, it is necessary to combine associated elements and crystal structure characteristics to distinguish between endogenous and exogenous sources. This study provides direct evidence from endogenous metabolism for tracing Fe-bearing particles, especially magnetic iron particles, within the human body.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yi Yu,Fanfan Li,Shengbo Ge,Xingchuan Yang,Mashallah Rezakazemi,Shuangquan Zang,Tejraj M. Aminabhavi,Li Xu
Homogeneous mixed iron-manganese oxide nanoparticles prepared from bimetallic MOFs were examined for their catalytic performance to examine toluene degradation. Introducing Fe into Mn 2 O 3 to obtain Mn 2-x Fe x O showed significantly improved catalytic combustion of toluene compared to single manganese or iron oxide. Among these catalysts, Mn 1.82 Fe 0.18 O 3 exhibited optimal catalytic performance showing the lowest T 10 , T 50 and T 90 in weight hourly space velocity (WHSV) of 60000 mL·(g·h) -1 . In high-water content atmosphere, catalytic activity was excellent even after four cycles and such a good catalytic performance of Mn 1.82 Fe 0.18 O 3 might be due to the high surface area (103 m 2 ·g −1 ) and uniform doping of Fe caused by MOFs roasting. Fe doping enhanced the weak acid sites onto Mn 2 O 3 surface, thus promoting the activation of toluene. The doped Fe elongated M = O bond to enhance the nucleophilicity of the active sites, which increased the intrinsic activity of Mn 2 O 3 catalyst. This study could serve as a reference for active sites modification of metal oxide catalysts.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Xihui Lu,Jinshan Wei,Hexing Lin,Yi Li,Ya-yun Li
Electrocatalytic reduction of nitrate (NO3RR) to ammonia offers a promising approach for mitigating the environmental impact of NO3–, while simultaneously enabling the synthesis of NH3 under ambient conditions. Recently, single-atom catalysts (SACs) have been proven to have attractive activity on NO3RR, and better catalysts with enhanced activity and stability are still in demand. Here, we report the efficient boosting of NH3 production via the NO3RR using boron-doped Fe SAC (Fe-BCN). Fe-BCN is a normal 12-hedral nanoparticle with a size of 500 nm. The NH3 Faradaic efficiency of Fe-BCN reached 97.48%, with a high ammonia production rate of 2.17 mg cm–2 h–1, in an alkaline electrolyte environment at an electrode potential of −0.3 V vs reversible hydrogen electrode. Density functional theory calculations revealed the strategy of introduced B regulating the intermediate adsorption on Fe-BCN, which enhanced the NO3RR activity. Furthermore, leveraging the high NO3RR activity of Fe-BCN, a nitrate-zinc battery with a power density of 0.90 mW cm–2 was constructed by using Fe-BCN as the cathode and zinc as the anode, respectively. This research demonstrates the broad prospects of Fe-BCN in the NO3RR and provides insights for high-performance Fe SAC electrode materials.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Ziwei Zhao,Qi Ling,Shangkun Deng,Ziliang Li,Jianguo Lv,Lei Yang,Chunbin Cao,Zhaoqi Sun,Miao Zhang
A type II heterostructured BiVO4/MIL-88B(Fe) composite was successfully synthesised for the photocatalytic degradation of tetracycline hydrochloride (TC-HCl) by a simple hydrothermal method. Thin film materials avoid secondary pollution of powder materials. The samples were characterised by XRD, SEM, TEM, XPS, UV-Vis DRS, and PL. The samples were also characterised for their optoelectronic properties. 3-BV/MIL-88B(Fe) (3 mmol BiVO4) was the most effective catalyst for the degradation of TC-HCl, achieving 92.1% removal at 75 min with a degradation rate constant of 22.79 × 10−3 min−1. Moreover, durability evaluation and TC-HCl degradation potential evaluation were also performed. We looked into how TC-HCl concentration, pH and ions affect the degradation results. In order to determine the active ingredients, experiments for trapping free radicals and EPR tests were performed. The results indicated that the main active species were h+ and ˙OH. It is proposed that a reasonable type-II heterostructure can help to explain the photocatalytic mechanism. The current study creates a stable photocatalytic system by compositing electrocatalytic and photocatalytic materials to achieve efficient antibiotic degradation and provides a viable strategy for future applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Haitao Yan,Didi Li,Zhaocong Jiang,Haoyuan Gu,Mengyuan Zhu,Yi-Fan Han,Minghui Zhu
Cu-based catalysts have been extensively used in the methanol steam reforming (MSR) reaction owing to low cost and high efficiency. In this work, we investigated the promotional effect of Fe on the Cu/ZnO/Al 2 O 3 catalysts prepared by an incipient-wetness impregnation method using a series of (quasi) in situ characterization techniques. The form of the Fe species was found to strongly depend on the Fe content. Fe species are present as highly dispersed FeO x in small amount of Fe with improved the dispersion of Cu. As Fe content increases, Fe species gradually transition to CuFe alloy and eventually to Fe 3 O 4 particles, leading to a decrease in Cu dispersion. With the gradual increase in Fe content, the apparent activity shows a volcanic trend, with CuAl-0.1Fe showing highest activity, whereas the intrinsic activity gradually decreases. Compared with CuAl- x Fe, adding moderate Fe to Cu/ZnO/Al 2 O 3 promotes the dispersion of Cu and Zn, forming abundant Cu-ZnO x interfacial sites, which improves both apparent and intrinsic activities. The best catalytic performance was obtained with the CuZnAl-0.1Fe catalyst, achieving the highest H 2 production rate of 134.7 mmol g cat −1 h −1 at 200 °C. This study reveals the role of Fe in Cu-based catalysts for MSR and inspires the design of improved Cu-based catalysts.
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Science Advances
·
2024
·Vol. 10
·期 28
·
IF 11.7
Hanrong Li,Yifan Li,Lingpu Zhang,Nan Wang,Dong Lu,Dongsheng Tang,Yitong Lv,Jinbo Zhang,Heben Yan,He Gong,Ming Zhang,Kaili Nie,Yi Hou,Yingjie Yu,Haihua Xiao,Chaoyong Liu
Celastrol (CEL), an active compound isolated from the root of Tripterygium wilfordii, exhibits broad anticancer activities. However, its poor stability, narrow therapeutic window and numerous adverse effects limit its applications in vivo. In this study, an adenosine triphosphate (ATP) activatable CEL-Fe(III) chelate was designed, synthesized, and then encapsulated with a reactive oxygen species (ROS)–responsive polymer to obtain CEL-Fe nanoparticles (CEL-Fe NPs). In normal tissues, CEL-Fe NPs maintain structural stability and exhibit reduced systemic toxicity, while at the tumor site, an ATP-ROS–rich tumor microenvironment, drug release is triggered by ROS, and antitumor potency is restored by competitive binding of ATP. This intelligent CEL delivery system improves the biosafety and bioavailability of CEL for cancer therapy. Such a CEL-metal chelate strategy not only mitigates the challenges associated with CEL but also opens avenues for the generation of CEL derivatives, thereby expanding the therapeutic potential of CEL in clinical settings.
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