SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Yiran Xiong,Langlang Wang,Ping Ning,Jianfei Luo,Xiang Li,Li Yuan,Yibing Xie,Yixing Ma,Xueqian Wang
The rational design of catalyst structures holds paramount significance for realizing efficient catalytic reactions. In this study, an Fe 3 O 4 @MnO 2 core–shell catalyst was successfully synthesized using a facile one-pot method and applied in the selective oxidation of H 2 S in blast furnace gas. The introduction of the MnO 2 shell suppressed the further growth and aggregation of Fe species, leading to outstanding catalytic stability. Simultaneously, abundant oxygen vacancies facilitated the adsorption and activation of oxygen, thereby enhancing H 2 S oxidation. Experimental results revealed that the Fe 3 O 4 @MnO 2 catalyst (Fe/Mn = 4:1) displayed 100 % H 2 S conversion and 95.7 % sulfur selectivity at 150 °C in a humid gas stream containing O 2 and CO. Remarkably, no discernible decline in catalytic activity was observed after 170 h of operation, indicating the promising industrial prospects of this catalyst. This study provides an effective strategy for designing efficient and stable desulfurization catalysts.
研究领域:
材料科学
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环境工程
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Yingying Fang,Wenbo Zhou,Yihuan Cheng,Yuge Zhang,Tingting Yu,Shaoxian Song
The high-value utilization of steel pickling waste liquid (SPWL) is an important direction in the resourceful utilization of hazardous waste. In this study, nano-Fe 3 O 4 prepared from SPWL (S-Fe 3 O 4 ) was hydrothermally compounded with MnO 2 as Fe 3 O 4 -MnO 2 (SFM), which were compared with Fe 3 O 4 -MnO 2 (CFM) prepared by chemical reagents. The synthetic materials were evaluated by SEM, VSM, BET, XRD, and zeta potential, the results show that the spherical S-Fe 3 O 4 was encapsulated by spiny spherical shell-like MnO 2 , and the SFM has a high saturation magnetization and specific surface area (159.91 m 2 /g). The adsorption experiments demonstrated that the adsorption effect of SFM on Pb 2+ is highly similar to that of CFM. The maximal adsorption capacity of SFM reached 129.74 mg/g under ideal composite ratio and pH conditions, and the adsorption process was unaffected by competing heavy metal ions coexisting in the environment. Moreover, the high saturation magnetization strength of the SFM makes it simple to separate materials under a magnetic field. The pseudo-second-order kinetics and Langmuir isotherm models provided a good description of the Pb 2+ adsorption on SFM. XPS and FTIR analysis provided evidence that the adsorbent surface has a high concentration of -OH functional groups, and that O atoms serve as Pb 2+ binding sites, suggesting that ion exchange occurs during the SFM adsorption process. In this paper, we developed a cheap SFM with high adsorption performance and provided a novel approach to the high-value application of SPWL.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 18
·8255-8269
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IF 6.7
Huanhuan Wang,Qi Qu,Jiangshan Gao,Yan He
Herein, Fe3O4@MnO2@Ni–Co/C composites derived from PBAs were successfully fabricated. Firstly, Ni–Co Prussian blue analogues (Ni–Co PBAs) were used as precursors to derive a carbon layer on their surface by annealing treatment and subsequently translated into MnO2@Ni–Co/C nanocubes after hydrothermal reactions. Fe3O4@MnO2@Ni–Co/C composites were finally obtained after depositing Fe3O4 nanoparticles through the annealing process. Their electromagnetic wave (EMW) absorption performance apparently enhanced, thanks to the excellent impedance matching and strong attenuation derived from the synergy between the dielectric loss and the magnetic loss. In particular, the minimum reflection loss (RLmin) of Fe3O4@MnO2@Ni–Co/C reached −41.2 dB with a thickness of 4.0 mm and the effective absorption bandwidth (EAB) reached 7.1 GHz with a thickness of 2.0 mm. Therefore, the results could be significant for synthesizing EMW absorbers with excellent performance, a broad bandwidth, strong absorption, thin thickness and light weight.
研究领域:
材料科学
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电磁学
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产品关联
DOI
PubMed
高影响因子
Advanced Materials Interfaces
·
2021
·Vol. 8
·期 11
·2100178
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IF 6.147
Limei Dong,Yiming Li,Xiuping Chen,Dan Zhang,Yihao Guan
Poor sorption capacity and low biodegradability of carbamazepine (CBZ) lead to the difficulties in CBZ removal from water. Sulfate radical-based advanced oxidation process shows great potential for organic pollutant removal. Metal organic frameworks (MOFs) demonstrate great potential in catalytic field due to their excellent properties. Hence, cobalt-based metal organic framework (ZIF-67) nanoparticles are loaded on Fe 3 O 4 -MnO 2 composite, and then this composite is applied as peroxymonosulfate (PMS) activator for CBZ degradation. The prepared catalyst exhibits excellent catalytic performance because of the central metal cobalt of ZIF-67 and the synergistic effect between MnO 2 and ZIF-67. 81% of CBZ with a high initial concentration of 20 mg L −1 is rapidly removed from water within 2.5 min. The prepared catalyst can be convenient to recycle under magnetic field while maintaining its high catalytic stability. Degradation mechanism analysis indicates that both • OH and SO 4 •− contribute to CBZ degradation, but SO 4 •− is the main radical species. XPS spectra reveal that Co(II)/Co(III), Mn(II)/Mn(III)/Mn(IV), and Fe(II)/Fe(III) are involved in PMS activation. The degradation pathway is put forward based on the detection of intermediates. This study provides a new inspiration for the fabrication of magnetic metal oxide-MOFs catalysts with outstanding recycling performance for PMS activation.
研究领域:
环境科学
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催化
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水处理
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
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2020
·Vol. 187
·期 3
·1-10
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IF 6.232
Zhu Wanying,Zhou Ying,Tao Mengdan,Yan Xiaoqiang,Liu Yan,Zhou Xuemin
A novel electrochemical and fluorescence dual-signal assay was developed for the determination of hydrogen peroxide (H 2 O 2 ) based on Fe 3 O 4 @MnO 2 and N-doped carbon dots (NCDs). Fe 3 O 4 @MnO 2 was not only applied as the recognizer for H 2 O 2 but also served as the fluorescence quencher and electrochemical enhancer. This permits the dual-signal readout of the analytical system. In the absence of H 2 O 2 , the NCDs were quenched by Fe 3 O 4 @MnO 2 , and the oxidation of the electrochemical probe ferrocene (Fc) was catalyzed by Fe 3 O 4 @MnO 2 . In the presence of H 2 O 2 , MnO 2 was reduced to Mn 2+ , leading to the fluorescence recovery of NCDs and the reduction in the oxidation signal of Fc. By combining the electrochemical method and the fluorescence assay, more comprehensive and valuable information for H 2 O 2 determination was provided to meet different analytical demands. The method exhibits good repeatability and selectivity with a detection limit of 1.0 μM for the fluorescence assay and 0.6 μM for the electrochemical method. The proposed approach holds great potential for probing released targets from living cells.
Graphical abstract
研究领域:
分析化学
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电化学
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荧光光谱学
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纳米材料
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2022
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IF 5.999
Wei Yang,Jianwen Fei,Wei Xu,Hongyan Jiang,Marwan Sakran,Junli Hong,Wanying Zhu,Xuemin Zhou
High plasma urate is closely related to gout, cardiovascular and other diseases. Therefore, monitoring the content of uric acid (UA) in plasma is of great significance for the treatment of gout and the prevention of other related diseases. Herein, a biosensor based on the biomimetic oxidase Fe 3 O 4 nanoparticles (NPs) @MnO 2 nanosheets (Fe 3 O 4 @MnO 2 NS) was constructed for colorimetric determination of UA. MnO 2 NS is an efficient biomimetic oxidase, and we found that the intrinsic oxidase activity of MnO 2 NS doped with Fe 3 O 4 NPs can be significantly enhanced. The chromogenic substrate TMB can be catalyzed by Fe 3 O 4 @MnO 2 NS to generate blue oxidized TMB, and UA can decompose the MnO 2 NS to inhibit the color reaction of TMB selectively, thereby realizing the quantitative detection of UA. In addition, the UA biosensor can perform colorimetric analysis of UA level through three methods: naked eye, smartphone and ultraviolet-visible (UV–vis) spectrophotometer. The linear ranges of UV–vis spectrophotometry and colorimetry with smartphone were 1–70 μM and 200–650 μM, respectively, and the limits of detection (LOD) were 0.27 μM and 21 μM. The analysis results of human plasma samples showed that the method had good selectivity and practicability.
研究领域:
生物传感器
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分析化学
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材料科学
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医学诊断
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产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2024
·
IF 4.9
Hong Chen,Junyan Liu,Mengna Wan,Shangyi Zhao,Xiaolong Li,Chuan Liu,Xuanping Zhao,Junjie Li,Qingzhen Ma,Cuixiang Li,Xueqin Wang
Fruit juice is kind of popular beverage food worldwidely, and its total antioxidant capacity (TAC) is generally considered as an important index for people’s rational diet, thus accurate evaluation of its TAC is essential for human health guidance. Herein, we constructed a sensitive Fe 3 O 4 @MnO 2 nanocatalyst that was delicately cored with magnetite nanoparticles (Fe 3 O 4 NPs) and encapsulated with manganese dioxide (MnO 2 ) nanoshells for fast and accurate TAC colorimetric analysis in fruit juice. The data showed the fabricated Fe 3 O 4 @MnO 2 nanocatalysts performed with remarkable oxidase mimetic activities and could catalyze oxidization of colorimetric substrate without additional H 2 O 2 , and the limit of detection (LOD) was about 0.39 μM for ascorbic acid (AA) evaluation. Applied in commercial fruit juice products, the fabricated Fe 3 O 4 @MnO 2 nanocatalysts showed a reliable and visual assessment for the accurate TAC analysis. In addition, the fabricated Fe 3 O 4 @MnO 2 nanocatalysts could be easily recycled due to their intrinsic superparamagnetic property. Together, an intellegent Fe 3 O 4 @MnO 2 nanocatalyst was well developed for visual TAC analysis in fruit juice with convenient applications in future.
研究领域:
纳米技术
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分析化学
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食品科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
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2023
·
IF 8.3
Fan Wang,Yueying Zheng,Xinggang Wei,Dawei Lan,Jintao Zhu,Yingjie Chen,Ziquan Wo,Tao Wu
This study designed a composite material with internal synergistic effects among multiple components to achieve highly selective adsorption of Cu (II). Through controlled synthesis, the Fe 3 O 4 /MnO 2 (3 1 0)/ZIF-67 composite was successfully fabricated, leading to significant improvement in adsorption selectivity , capacity, and adsorption rate. The experimental results showed that the composite is of outstanding selectivity in the adsorption of Cu (II), with a partition coefficient K of Cu (II) that was 2.2–5.3 times higher than that of other coexisting ions. Moreover, the composite exhibited a remarkable adsorption capacity of 1261.0 mg g −1 and a fast adsorption rate of 840.7 mg g −1 h −1 at 298 K. Additionally, its magnetic property facilitated easy separation from wastewater, thereby enhancing its potential for commercial applications. The synergetic effect mechanism was analyzed through characterizations and DFT calculations. Furthermore, the recyclability of the composite was investigated, which showed that after seven cycles, the adsorption efficiency remained at 85% of its initial efficiency. It can be concluded that Fe 3 O 4 /MnO 2 (3 1 0)/ZIF-67 has potential to address challenges posed by heavy metal pollution in copperplating effluents.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 42
·6848-6857
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IF 4.776
Ying Yang,Chen Wang,Chen Tian,Hailing Guo,Yuhua Shen,Manzhou Zhu
Considering traditional treatment methods, such as chemotherapy, with their potential side effects and lack of targeting, photodynamic therapy (PDT) and photothermal therapy (PTT), being innovative, with less side effects, and light-controlled strategies for antitumour applications, have received extensive attention, but the efficacy of PDT is seriously hindered by the hypoxia tumour microenvironment. Here, a multifunctional nanocomposite composed of an iron oxide (Fe3O4) core and two shells of manganese dioxide (MnO2) and polypyrrole (PPy) was successfully prepared and used to solve these issues. PPy, simultaneously as the photothermal agent and photosensitizer, was first combined with MnO2 to coat magnetic Fe3O4 for achieving an increase in the intracellular O2 concentration and to improve the generation ability of singlet oxygen upon laser irradiation, so that enhanced PDT/PTT could be obtained. After the efficient loading of doxorubicin (DOX) on the Fe3O4@MnO2@PPy nanocomposite, an acid controlled-release behaviour for DOX as well as magnetic-targeting-assisted synergistic effects of chemotherapy and improved PDT/PTT for tumour cells could be realized, which could also protect normal cells from damage. All these features may render our nanocomposite a promising platform to reverse hypoxia-triggered PDT resistance and chemotherapy-caused side effects in cancer therapy and other biomedical applications.
研究领域:
纳米技术
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癌症治疗
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生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2026
·
IF 10.6
Bo Yuan,Zhiguo Xu,Qian Yu,Zhipeng Ma,Xiaomeng Zuo,Runlong Hao
Low-temperature catalytic oxidation of toluene (<200°C) remains a significant challenge for VOCs abatement. Herein, a core-shell Fe 3 O 4 @MnO 2 catalyst with high microwave (MW) utilization efficiency is developed for MW-enabled low-temperature toluene oxidation, representing the first application of such core-shell MW absorbers to VOCs removal. Physicochemical and electromagnetic properties confirm that the core-shell architecture markedly enhances MW absorption and attenuation, enabling conversion of MW energy into catalytic activity. Compared with thermal catalysis, MW exhibits superior performance in 100–200℃ range (71.22–98.79% vs 24.90–61.74%), delivering accelerated kinetics and reduced activation barriers. Notably, Fe 3 O 4 @MnO 2 achieves a T 90 of 150℃ under MW catalysis and demonstrates enhanced SO 2 /H 2 O/NO resistances and stable operation over 24 h. DFT calculations reveal that Fe 3 O 4 @MnO 2 heterojunction promotes interfacial charge separation and transport, lowers oxygen vacancy formation and O 2 activation barriers, and strengthens toluene adsorption and C–H bond activation. Mechanistic investigations demonstrate that the MW-assisted oxidation proceeds via a synergistic pathway: ·OH-dominated radical oxidation governs the initial C–H bond cleavage and mineralization of gaseous intermediates, while O lat –mediated non-radical oxidation dominates the deep oxidation of surface-bound intermediates. Furthermore, the distinct roles of MW thermal and non-thermal effects are clarified, and the degradation products and pathways are elucidated. This work demonstrates the advantages of MW for efficient toluene oxidation at low temperatures, expanding the use of MW absorbers into environmental catalysis and offering a promising strategy for VOC abatement.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 21
·52199
·
IF 3.057
Wenjiao Wang,Mingming Zheng,Jiajia Ren,Mingliang Ma,Xunqian Yin,Tingxi Li,Yong Ma
Magnetic Fe 3 O 4 /MnO 2 /TiO 2 /polypyrrole (PPy) heterostructure as adsorbent for adsorbing Mn 7+ was synthesized by combining hydrothermal method and chemical oxidation method. The heterostructure was characterized by field-emission scanning electron microscope, Fourier transform infrared spectroscopy, X-ray diffraction, and vibrating sample magnetometer. Its saturation magnetization is 18.88 emu/g, so it is easy to separate it from the solution. The feasibility of Fe 3 O 4 /MnO 2 /TiO 2 /PPy heterostructure to remove Mn 7+ was researched in detail. It is found that the optimal pH is 2. The initial adsorption rate can reach 4.60 mg/g min. At 288.15 K, the maximum equilibrium adsorption capacity is 202.8 mg/g. Adsorption kinetics follows a pseudo second order model, as well as is determined by through membrane diffusion processes. The Langmuir isotherm model is used to describe the adsorption isotherm behavior. Besides, thermodynamic parameters indicate spontaneous adsorption behavior, and entropy of the endothermic reaction increases. Finally, the cycle test results show that the adsorbent has better cycle performance, displaying broad application prospects.
研究领域:
环境科学
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材料科学
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化学工程
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纳米技术
·
污染控制
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
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IF 4.233
Liying Jiang,Qichao Ye,Jianmeng Chen,Zhong Chen,Youli Gu
In this study, bentonite–Fe 3 O 4 –MnO 2 composite was synthesized by combining bentonite with Fe 3 O 4 and MnO 2 through co-precipitation. Vibrating-sample magnetometry , scanning electron microscopy with energy-dispersive X-ray spectrometry , transmission electron microscopy , Brunauer–Emmett–Teller measurements, and X-ray powder diffraction techniques were used to characterize the composite. The composite consists of Fe 3 O 4 nanoparticles orderly assembled on the surface of bentonite and an outer layer of MnO 2 sheets. The composite’s particles possess a saturation magnetization of 13.4–30.5 emu/g and a high specific surface area (203.89 m 2 /g). The adsorption behaviors of the composite in Cd(II) removal were evaluated by batch equilibrium experiments. Kinetic and isothermal data fit well the pseudo-second-order and the Freundlich models, respectively. Adsorption reached equilibrium within 30 min, and the Freundlich capacity of the composite was 35.35 mg/g. The adsorption capacity of Cd(II) increased with increasing pH and was dependent on the ionic strength . Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy showed the combination of surface hydroxyl groups of the composite and Cd(II) in the solution. The prepared composite can be easily recycled and reused by taking advantage of its magnetic properties . The results show that the designed composite is a promising absorbent for the treatment of Cd-contaminated water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）