Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 8
·1085-1095
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IF 4.5
Qi Yi,Zeng Xuezhi,Xiong Lingyingzi,Lin Xuliang,Liu Bowen,Qin Yanlin
The aromatic properties of lignin make it a promising source of valuable chemicals and fuels. Developing efficient and stable catalysts to effectively convert lignin into high-value chemicals is challenging. In this work, MnFe 2 O 4 spinel catalysts with oxygen-rich vacancies and porous distribution were synthesized by a simple solvothermal process and used to catalyze the depolymerization of lignin in an isopropanol solvent system. The specific surface area was 110.5 m 2 ·g −1 , which substantially increased the active sites for lignin depolymerization compared to Fe 3 O 4 . The conversion of lignin reached 94%, and the selectivity of alkylphenols exceeded 90% after 5 h at 250 °C. Underpinned by characterizations, products, and density functional theory analysis, the results showed that the catalytic performance of MnFe 2 O 4 was attributed to the composition of Mn and Fe with strong Mn-O-Fe synergy. In addition, the cycling experiments and characterization showed that the depolymerized lignin on MnFe 2 O 4 has excellent cycling stability. Thus, our work provides valuable insights into the mechanism of lignin catalytic depolymerization and paves the way for the industrial-scale application of this process.
研究领域:
化学工程
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材料科学
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可再生能源
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2024
·
IF 5.5
Li Feng,Yanyan Liu,Yuxue Shan,Shuao Yang,Lanting Wu,Tianyu Shi
Background Ciprofloxacin (CIP) is a broad-spectrum antibacterial agent. Its extensive use has led to high frequency detection in various water environments, resulting in environmental pollution. The peroxymonosulfate-based advanced oxidation processes (PMS-AOPs) is a promising method for the removal of organic pollutants due to its low cost and high redox potential. Methods Magnetic CuS/MnFe 2 O 4 composites were successfully prepared using hydrothermal and solvothermal methods. The catalysts were characterized by XRD, SEM, TEM and VSM, and the degradation efficiency and mechanism of CIP by CuS/MnFe 2 O 4 /PMS system were investigated. Significant findings The results demonstrated that the magnetic CuS/MnFe 2 O 4 composites exhibited superior catalytic performance than pure CuS and pure MnFe 2 O 4 . Under optimized degradation conditions (CuS/MnFe 2 O 4 =15 mg/L, PMS=1 mM, CIP=20 mg/L, initial pH = 5.89, T = 25 ℃), 98.9 % of CIP was degraded within 60 min. Metal ions (Cu, Mn, Fe) on the catalysts surface played an important role in activating PMS, whereas low-sulfur species (S 2− and S n 2− ) promoted the Cu(II)/Cu(I), Mn(III)/Mn(II) and Fe(III)/Fe(II) cycles to accelerate the generation of free radicals. Additionally, S O 4 • − and 1O 2 were considered to be important reactive species in the CuS/MnFe 2 O 4 /PMS system. Finally, the magnetic CuS/MnFe 2 O 4 composites exhibited excellent recyclability and universality.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 39
·59224-59234
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IF 5.19
Huang Congxin,Tang Chaochun,Wu Qingqing,Zhu Qing
Due to the layered structure and recycling characteristics, magnetic MnFe 2 O 4 /ZnFe-LDH was prepared by co-precipitation. In this study, we intensively explored MnFe 2 O 4 /ZnFe-LDH for water purification compared with the ZnFe-LDH. The morphological and structural characteristics of the obtained products were systematically characterized. MnFe 2 O 4 /ZnFe-LDH exhibits the maximum adsorption capacity of 94.52 mg/g for phosphate and 49.03 mg/g for Cr (VI), respectively, which is superior to that of the ZnFe-LDH, indicating that the magnetic MnFe 2 O 4 effectively enhanced adsorption performance. Meanwhile, the mechanism of adsorption of phosphate and Cr (VI) was briefly studied, where the metal center ion in MnFe 2 O 4 /ZnFe-LDH and between layers of SO 4 2− serves as capture sites for phosphate and Cr (VI) removal. Furthermore, the MnFe 2 O 4 /ZnFe-LDH can be used for magnetic recycled and still maintained excellent removal efficiency (70%) for phosphate and Cr (VI) after five adsorption–desorption cycles. This work could open a new vista of designing magnetic novel adsorbents in environmental remediation.
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 NANOSCIENCE AND NANOTECHNOLOGY
·
2017
·Vol. 17
·期 9
·6489-6496
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IF 1.483
Chen Yun-Xia,Li Ru-Chang,Zhang Yuan-Hu,Chen Xue-Gang,Ye Ying
Halloysite/MnFe2O4 nanocomposites have been proposed as a novel material which can be used in magnetic and electromagnetic applications. In this study, we fabricated two kinds of halloysite/MnFe2O4 nanocomposites. The XRD and TEM characterizations
suggested that ferrite nanoparticles were mainly adhered on the outer surface of HNTs (named as WMH) and in the inner wall (MH), respectively. Both MH and WMH were applied to adsorb methylene blue (MB) from aqueous solutions. The results indicated that both MH and WMH can remove more than
97% MB at a dosage of 2 g L−1 and initial MB concentration of 20 mg L−1. The adsorption processes by both nanocomposites fit pseudo-second-order kinetic model and Langmuir isotherm with correlation coefficient of >0.99. WMH (19.19 mg g−1)
shows slightly higher maximum adsorption capacity than MH (18.52 mg g−1), contradicts to the fact that the mesopore volume of MH is 30% larger than that of WMH. It can be reconciled by the strong bonding between the outer surface ferrite nanoparticles of WMH and the MB molecules,
which greatly enhanced the MB adsorption capacity. In addition, the dimethylamino groups of MB molecules were preferably removed, suggesting the MB degradation by the ferrite nanoparticles during adsorption. Furthermore, both WMH and MH can be easily magnetic separated and recycled. The MB
removal efficiency can be maintained at after regenerated for 5 times. Ascribed to the advantages of easily recycling and regeneration, low cost, and MB degradation, the halloysite-MnFe2O4 nanocomposites are potential environmental friendly adsorbents for removing organic
pollutants.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2014
·
IF 2.235
Jun Chen,Weijie Wen,Linjun Kong,Shuanghong Tian,Fuchuan Ding,Ya Xiong
Magnetically separable MnFe2O4 was prepared successfully by a sol–gel combustion method. The synthesized MnFe2O4 was characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM), Brunauer–Emmett–Teller (BET) surface area, zeta potential, and magnetic hysteresis loops. The catalytic activity of MnFe2O4 was evaluated by the ozonation of 4-chlorophenol (4-CP) at different solution pH value, ozone gas concentration, MnFe2O4 dosage, and initial 4-CP concentration. The ozone consumption was monitored and the ·OH exposure was calculated in different processes. It was found that MnFe2O4 was highly effective in catalyzing ozone decomposition and favored to generate more hydroxyl radicals. Moreover, the synergistically catalytic effect between Mn and Fe in MnFe2O4 was confirmed. Finally, lifetime of MnFe2O4 was measured in a novel integrated membrane-heterogeneous catalytic ozonation reactor designed for the first time. All the experimental results show that MnFe2O4 is a highly recoverable, efficient, and durable catalyst in the ozonation.
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
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Shuyi Huang,Shibo Jiang,Hongwei Pang,Tao Wen,Abdullah M. Asiri,Khalid A. Alamry,Ahmed Alsaedi,Xiangke Wang,Suhua Wang
Magnetic nanomaterials are promising adsorbents for their superior performance in the elimination of radioactive ions from aqueous solution. In this study, a new kind of fluorescent carbon dots were successfully introduced into MnFe 2 O 4 to fabricate magnetic polyethyleneimine-functionalized carbon quantum dots/MnFe 2 O 4 (PECQDs/MnFe 2 O 4 ) nanocomposites by a simple hydrothermal method, which combined the fluorescent characteristic of CQDs, adsorption capacity of polyethyleneimine and magnetic separation property of MnFe 2 O 4 . Detailed characterization certified the formation of nanohybrid composites and its integrating advantages of fluorescence property and magnetism separation, which demonstrated its potential in immobilizing U(VI) and monitoring the adsorption process simultaneously in wastewater. The obtained PECQDs/MnFe 2 O 4 was applied to remove U(VI) from aqueous solution and showed superior construction stability and adsorption capacity of 194 mg/g. Moreover, the kinetic and thermodynamic results suggested that the immobilization of U(VI) was an endothermic and spontaneous multilayer adsorption dominated process. In the end, the cation exchange and interaction between uranyl ions and abundant functional groups (i.e., NH 2 , OH and COOH) on PECQDs/MnFe 2 O 4 were revealed to be responsible for the enhanced adsorption of U(VI), which was realized by forming outer-sphere surface complexes in the removal process. This study proposed an ultrafast-kinetics and high-efficiency adsorbent for U(VI) sequestration, which has a great application potential due to its outstanding recycling performance.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2025
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IF 5.2
Li Yaqi,Dai Yimin,Cai Ling,Yang Siwen,Wang Junlong,Liu Bo,Ding Xianglong,Zhang Yue-Fei,Li Yan,Lu Cuihong,Wan Li
Using aniline and environmentally friendly chitosan as raw materials, MnFe 2 O 4 with photocatalytic properties was introduced and in-situ polymerization was used to prepare Cht/PANI/MnFe 2 O 4 . The Cht/PANI/MnFe 2 O 4 was characterized by FTIR, SEM, XPS, XRD, BET and TGA. The experiment on the influence of pH on the adsorption capacity of the material shows that an acidic environment is conducive to the adsorption of fuel by the adsorbent. The zero charge point (pH PZC ) on the adsorbent surface is obtained at pH 6.45. The adsorption kinetic model conformed to the pseudo second order model, and the adsorption isotherm was in agreement with the Langmuir isotherm model. The q max values of Cht/PANI/MnFe 2 O 4 and Cht/PANI were 202.84 and 148.37 mg·g −1 . Experimental results have shown that Cht/PANI/MnFe 2 O 4 exhibits photocatalytic performance, which is superior to pure MnFe 2 O 4 .The maximum removal amount of Cht/PANI/MnFe 2 O 4 at equilibrium is 2569.66 mg·g −1 . The photocatalytic process of Cht/PANI/MnFe 2 O 4 also conforms to the pseudo-second-order kinetic model. The material has the advantages of simplicity and environmental friendliness and has potential application prospects in the purification of dye wastewater. The study proposed possible mechanisms for the adsorption and photocatalysis of CR.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Shu Liu,Dan Guo,Congpu Mu,Bochong Wang,Jianyong Xiang,Tianyu Xue,Kun Zhai,Fusheng Wen
With the booming development and wide applications of modern communication technology, wearable devices are becoming more and more popular in our life. Meanwhile, the pollution and radiation of electromagnetic wave (EMW) is becoming increasingly prominent and threating to human health, equipment operation and military security. Multi-component regulation and spatial microstructure design of microwave absorption materials is an effective strategy for solving the pollution and radiation of electromagnetic wave. Herein, aramid nanofibers/carbon nanotubes/MnFe 2 O 4 (ACF) composite aerogel were prepared through the combination of freeze-drying technique and hydrothermal method . Impedance matching of aramid nanofibers/carbon nanotubes aerogel is improved by introducing MnFe 2 O 4 particles, inducing to that EMW is more easily incident into aerogel and then attenuated by microwave absorber. In addition, the three-dimensional networks structure of aerogel can enhance the multiple reflection and scattering, and improve the loss capacity of EMW. ACF05 aerogel exhibits a minimum reflection loss of −64.6 dB at 12.0 GHz and broad effective absorption bandwidth of 5.0 GHz under thickness of 2.1 mm. The excellent microwave absorption (MA) performance of ACF aerogel mainly comes from the synergistic effect of three-dimensional networks structure, impedance matching, dielectric loss and magnetic loss.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
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2022
·
IF 3.51
Sizhan Wu,Hangdao Qin,Hao Cheng,Wei Shi,Jing Chen,Jiming Huang,Hui Li
A novel sulfonic-functionalized MnFe 2 O 4 (MnFe 2 O 4 -HSO 3 ) Fenton nanocatalyst was prepared and tested for the degradation of three antibiotics from different categories. The effect of category of the antibiotic was investigated and the obtained results indicated that the degradation rate was the highest for erythromycin, lower for tetracycline and the lowest for amikacin. Moreover, the role of -HSO 3 was investigated by a series of comparative experiments between MnFe 2 O 4 and MnFe 2 O 4 -HSO 3 . The introduction of -HSO 3 prevented the leaching of metals and promoted the decomposition of H 2 O 2 into •OH radicals. Finally, the excellent stability of MnFe 2 O 4 -HSO 3 was verified.
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
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Quan Chen,Peng Yi,Wei Dong,Yihui Chen,Liping He,Bo Pan
The discharge and consequent occurrence of antibiotics in the environment has led to increasing concerns because their presence can promote the development of resistance genes, which in turn pose a significant health risk. A key process to control the transport and risk of antibiotics is adsorption. Thus, we investigated the adsorption mechanisms of six typical antibiotics onto a MnFe 2 O 4 @cellulose activated carbon (CAC) hybrid combining batch adsorption experiments and quantum chemical calculations. In the single-adsorbate adsorption systems, the solid-phase concentrations of the adsorbates varied from 152.8 to 395.7 mg/g, which were dependent on the adsorption affinity and molecular structures or sizes of the antibiotics. Chemisorption was the main adsorption mechanism, and it was driven by p-d electronic conjugation and cation-π interactions. In the competitive adsorption systems, the solid-phase concentrations of both primary (sulfamethazine, SMT) and secondary (the other five antibiotics) adsorbates decreased significantly. The decrease ratio of SMT varied from 15.42% to 67.28% while that of the secondary adsorbates varied from 14.13% to 52.74%. The “competition” strength was depended on the adsorption energy and the overlapping of adsorption sites. We believe that these findings will provide a better understanding of the adsorption characteristics of typical antibiotics and facilitate the strategy developing for the removal of antibiotics from the aqueous phase.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-11
·
IF 3.8
Yu Weiwei,Ai Ting,Sun Weizhe,Yang Shuo,Mao Yufeng,Tan JiangLin,Yu Feng,Yin Chen,Jiang Qin,Yu Chengye,Chen Shiling
In this study, MnFe 2 O 4 microspheres were synthesized to activate potassium persulfate complex salt (Oxone) for the degradation of 17β-estradiol (17β-E2) in aqueous solutions. The characteristic of MnFe 2 O 4 was detected by XRD, XPS and SEM-EDS. The experimental results indicated that the degradation of 17β-E2 followed pseudo-first-order kinetics. At 25 °C, 17β-E2 concentration of 0.5 mg/L, MnFe 2 O 4 dosage of 100 mg/L, Oxone dosage of 0.5 mmol/L, and initial pH value of 6.5, the decomposition efficiency of 17β-E2 reached 82.9% after 30 min of reaction. Additionally, free radical quenching experiments and electron paramagnetic resonance analysis demonstrated that SO 4 − • and •OH participated in the reaction process of the whole reaction system, with SO 4 − • being the main reactive oxygen species (ROS). The activation mechanism of the MnFe 2 O 4 /Oxone/17β-E2 system is proposed as follows: MnFe 2 O 4 initially reacts with O 2 and H 2 O in solution to generate active Fe 3+ -OH and Mn 2+ -OH species. Subsequently, Fe 3+ -OH and Mn 2+ -OH react with Oxone in a heterogeneous phase activation process, producing highly reactive free radicals. After four cycles of MnFe 2 O 4 material, the removal rate of 17β-E2 decreased by 24.1%.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2016
·
IF 2.848
Zhiming Sun,Guangyuan Yao,Mingyi Liu,Shuilin Zheng
The novel magnetic MnFe 2 O 4 /diatomite composites were synthesized via a precipitation/hydrothermal method combined with alkali treatment. The microstructure and interface properties of the obtained composites were characterized by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and zeta potential analyzer. The adsorption behaviors of as received magnetic MnFe 2 O 4 /diatomite composite adsorbents for cationic dyes including methylene blue and basic fuchsine have been investigated in this study. The batch adsorption experiments showed that the adsorption process was very fast and the kinetic data well fitted with pseudo-second-order model. The adsorption isotherms well followed the Langmuir isotherm model, and the maximal adsorption capacity for methylene blue and basic fuchsine can reach 104.06 and 284.09 mg/g at 318 K, respectively. The adsorption behavior of the MnFe 2 O 4 /diatomite composite is an endothermic and spontaneous process. The magnetic MnFe 2 O 4 /diatomite composite can be a promising candidate as an adsorbent for the removal of cationic dyes from wastewater.
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
危险品化学品经营许可证（带存储）