SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Meng Xia,Zheng Shen,Minyan Gu,Wenbo Chen,Wenjie Dong,Yalei Zhang
Microalgae residue was efficiently converted into lactic acid with a high yield (33.9%) under mild reaction conditions (210 °C, 2 h) over a Fe-Sn-Beta catalyst. Under the action of homogeneous H 3 O + and distinct Lewis acid sites on the catalyst, the production of lactic acid from microalgae residue underwent three main reaction steps: hydrolysis, isomerization , and retro-aldol condensation. Results demonstrated that the lipid component had a strong inhibitory effect on the production of lactic acid due to the formation of aromatics, esters, and complex nitrogenous heterocyclic compounds , which covered or poisoned the Lewis acid sites of the catalyst. The protein component acted as a chemical buffer that enhanced the production of lactic acid by controlling the release of monosaccharides from the carbohydrate fraction of microalgae and maintaining the catalytic activity of the catalyst. Thus, microalgae residue demonstrated great promise for the production of value-added chemicals.
研究领域:
生物化学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Zhenlei Wang,Yinxing Zhao,Tingting Zhang,Sizhe Lai,Qiwu Zhang,Yunliang Zhao
Arsenic (As) contamination in industrial wastewater on a large scale has posed a enormous threat to ecological security in recent decades. However, a key challenge at present is the efficient and cost-effective removal of As contamination, as Fe in the As removal process cannot quickly and stably form an active phase with high activity for arsenic removal. Here, we propose a strategy to use mechanical activation of dolomite to regulate the formation of newly formed Fe-hydroxide from Fe(II) with high arsenic-removal activity, while stably regulating the pH of water in the near-neutral range, thereby substantially improving the removal efficiency as well as the stability of Fe(II) for As. Activated dolomite can significantly enhance the oxidation rate of Fe(II) in water, and synergistically remove As contamination over 99.5 % of water with an initial concentration of 50 mg/L within 2 h, far superior to the performance of single Fe(II) or dolomite&Fe(II). The simulation and characterisation results reveal that in the presence of activated dolomite, the solution pH as well as the oxidation rate of Fe(II) are effectively regulated, which promotes the As in the solution to be significantly immobilised on the surface of activated dolomite as a ternary precipitate of Ca/Mg-Fe-As, conducive to the stability of the enhanced As removal precipitation. This study provides new insights into the role of carbonate mineral materials in As transformation, which is important for the efficient and cost-effective purification of As contamination in water.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Xukai Li,Weirui Chen,Yiming Tang,Laisheng Li
Fe-MCM-48 catalyst with a three-dimensional cubic pore structure was directly synthesized via a hydrothermal method, and the mineralization efficiency of diclofenac (DCF) in the catalytic ozonation process (Fe-MCM-48/O 3 ) was assessed. X-ray diffraction (XRD), N 2 adsorption desorption, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) characterizations revealed that Fe existed in the framework of MCM-48, and Fe-MCM-48 possessed a large surface area and a highly ordered cubic mesoporous structure, which could accelerate reactants and products diffusion. Regarding mineralization efficiency, the addition of Fe-MCM-48 significantly improved total organic carbon (TOC) removal, and approximately 49.9% TOC were removed through the Fe-MCM-48/O 3 process at 60 min, which was 2.0 times higher than that in single ozonation. Due to this catalyst's superior structure, Fe-MCM-48 showed the better catalytic activity compared with Fe-MCM-41 and Fe loaded MCM-48 (Fe/MCM-48, Fe existed on the surface of MCM-48). DCF removal in the Fe-MCM-48/O 3 process was primarily based on ozone direct oxidation. The improvement of mineralization efficiency was attributed to the function of generated hydroxyl radicals (•OH), which indicated that the presence of Fe-MCM-48 accelerated ozone decomposition . Moreover, the negatively charged surface of Fe-MCM-48 and the proper pH value of the DCF solution played an essential role in OH generation.
研究领域:
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Weirui Chen,Yixiang Bao,Xukai Li,Jun Huang,Jinxin Xie,Laisheng Li
Heterogeneous catalytic ozonation had met the bottlenecks when treating low concentration but high toxic pollutants: (i) the low mass transfer efficiency of ozone and pollutants to hydrophilic catalyst; (ii) the negative impact of coexisted water matrixes. Herein, to enhance the mass transfer efficiency of reactants toward hydrophilic Fe-MCM-41 as well as enhance the interfacial reaction, the fluoride planting Fe-MCM-41 (F-Fe-MCM-41) was synthesized and employed as catalyst in catalytic ozonation for nitrobenzene (NB). Both NB and TOC removal were promoted in F-Fe-MCM-41/O 3 with 99.0 % NB removal in 60 min and 88.6 % TOC removal in 120 min, which were superior to the degradation efficiency by O 3 and Fe-MCM-41/O 3 . FTIR, EPR, Mössbauer spectra, 29 Si NMR, 19 F NMR et al verified that the replacement of non-reactive silanols (-Si−OH) of Fe-MCM-41 with Si F groups could enhance its hydrophobicity, Lewis acidity and mass transfer effect. Comparative characterizations, experiments and theoretical calculations verified that interfacial reaction played the major role over liquid phase reaction for NB degradation in F-Fe-MCM-41/O 3 . Moreover, the strengthened interfacial reaction also reduced the OH scavenging effect of water matrix, such as humic acid and carbonate. The interfacial adjustment method proposed in this study provided a novel insight into catalyst design and water treatment process.
研究领域:
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yeshuang Wang,Mingxian Duan,Zhelin Su,Chao Yang,Bingning Wang,Jiawei Kou,Huiling Fan
The abundant Fe 3+ Lewis acidic sites and well-developed pore structure endow the Fe-MOFs with great potential for H 2 S catalytic oxidation at room temperature, but their performance is inferior owing to the insufficient redox ability of the Fe 3+ species inherent in frameworks. Herein, an effective protocol was proposed for the first time to remarkably improve the catalytic oxidation performance of MIL-100(Fe) under ambient conditions through the introduction of Fe 2+ coordinatively unsaturated site (CUS) species into the framework. As expected, the sample after modification had a superior H 2 S breakthrough capacity of 267.3 mg S/g, an 18.4-fold increase compared with that without Fe 2+ CUS (14.5 mg S/g). The introduced Fe 2+ species triggered the Fe 3+ /Fe 2+ redox cycle for H 2 S catalytic oxidation by enhancing the oxidative ability of the Fe 3+ CUS intrinsic to the framework. Moreover, the Fe 2+ CUS was also found act as an active site for O 2 activation into O 2 ∙– , which not only provides an additional pathway for H 2 S catalytic oxidation but also accelerates the redox cycling of Fe 3+ /Fe 2+ during the catalytic oxidation process. On the basis of the experimental findings, a plausible catalytic mechanism involving mixed-valence iron sites in MIL-100(Fe) was proposed.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2025
·Vol. 15
·期 36
·e02595
·
IF 26
Xiang Ji,Yi Li,Yanlong Wang,Jian Jiang,Maowen Xu,Jianhui Zhu
Rechargeable Fe-ion batteries with overwhelming cost/environmental benign superiorities hold great promise in large-scale charge-storage applications. However, there is still a lack of competitive cathodes with prominent capacity and long-term cyclability. To overcome these constraints, a unique Fe 2+ /NH 4 + co-insertion strategy is proposed, enabling both doubled reversible capacity and cyclic life of Berlin green (FeHCF) cathodes. The Fe 2+ insertion proves to induce FeHCF lattice contractions, alter ligand environment/activation energies of low-spin Fe III, and hence boost the redox conversion depth, while NH 4 + co-insertions help to elevate the cathode capacities by utilizing Fe 2+ -unoccupied reaction sites. Besides, they generate hydrogen bonds between inserted NH 4 + ions and N atoms in FeHCF, capable of vastly strengthening the cathode's cyclic durability. Cathodes in such collaborative dual-cation electrolytes exhibit a remarkable capacity of 162 mAh g −1 (4 A g −1 ) and far prolonged operation lifespan (over 1000 cycles) when compared to single-cation cases. The assembled full cells demonstrate impressive energy densities up to 70.4 Wh kg −1 , and far superior capacity retention of 88% after all the cycling. This work may offer a simple/feasible, and effective route to render high-capacity and long-lasting cathodes for future/practical Fe-ion battery systems.
研究领域:
储能
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电化学
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材料科学
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电池技术
·
可持续能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2024
·
IF 5.9
Fuhao Gan,Chunmei Gao,Shifeng Ji,Yunqing Xing,Tianming Gong,Lihui Tian,Yiming Bai,Zhuolong Wu
In this study, the iron-based metal–organic framework MIL-53(Fe) was successfully prepared by a solvent method and used as a photocatalyst for the efficient degradation of DDBAC under visible light. The morphology, structure and photocatalytic properties of MIL-53(Fe) were investigated by SEM, XRD, XPS and UV–vis DRS characterization methods. The optimum conditions for the degradation of DD pathways of DDBAC were analyzed in combination with DFT calculations. Based on molecular orbital theory and free radical quenching experiments, it was demonstrated that hydroxyl radicals were the main contributors in the oxidative degradation of DDBAC. The toxicity of DDBAC and its intermediates was evaluated by culturing Chlorella vulgaris, and the results showed that the Vis/MIL-53(Fe)/H 2 O 2 system was capable of solution detoxification.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Qianshun Chen,Qiuyan He,Yiting Wang,Chen Huang,Yuyu Lin,Jieyang Wang,Wei Shen,Bin Qiu,Xunyu Xu
Carcinoembryonic antigen (CEA) is the most widely adopted biomarker for the early determination of various cancers, thus it is very important to design a simple and highly effective sensing method to detect CEA. Herein, by synthesizing Fe-MOF nanohybrid loaded with platinum nanoparticles (Pt NPs/Fe-MOF) nanozyme and selecting CEA aptamer (Apt) as the specific recognition element, a simple nanozyme-based voltammetric sensor was designed to detect CEA based on Apt-controlled the catalytic activity of Pt NPs/Fe-MOF nanozyme. The as-synthesized Pt NPs/Fe-MOF nanozyme could catalyze effectively 1,2-diaminobenzene oxidation to produce electroactive 2,3-diaminophenazinc (DAP) which can exhibit a strong reduction current. Nonetheless, when Pt NPs/Fe-MOF is covered fully by Apt of CEA, the peroxidase activity of the as-synthesized Pt NPs/Fe-MOF nanozyme is remarkably restricted and the peak current of DAP would disappear nearly. Interestingly, this catalytic activity could be recovered effectively in the presence of CEA owing to the specific identification of Apt toward CEA. Through optimizing several experimental factors, the as-designed nanozyme voltammetric sensor offers superior detective performance for CEA. In addition, the as-designed sensor possesses superior specificity and selectivity, reproducibility and stability as well as practical applications, showing great potentials for achieving simple, sensitive and highly effective determination of CEA.
研究领域:
生物化学
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医学诊断
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Miaofei Sun,Sajjad Ali,Chengyin Liu,Chunhui Dai,Xin Liu,Chao Zeng
In this work, a series of hydrogenated Fe-doped AgIO 3 (FAI-x) catalysts are synthesized for photodegrading diverse azo dyes and antibiotics. Under the irradiation of natural sunlight with a light intensity of ∼60 mW/cm 2 , the optimum FAI-10 exhibits a considerable rate constant for decomposing methyl orange (MO) of 0.067 min −1 , about 7.4 times higher than that of AgIO 3 (0.009 min −1 ), and 24.6% and 83.8% of MO can be decomposed over AgIO 3 and FAI-10 after irradiation for 40 min. In the amplification photodegradation experiments with using 0.5 g catalyst and 400 mL MO dye solution (10 mg/L), FAI-10 possesses greatly higher photoreactivity to common semiconductors (ZnO, TiO 2 , In 2 O 3 and Bi 2 MoO 6 ), and the photodegradation rates over FAI-10 are 92%. Particularly, the FAI-10 shows superior stability, the activity of which remains unaltered after 8 continuous cycles. Foreign ions and water bodies have slight effect on the activity of FAI-10, but the MO degradation rates are decreased by adjusting pH values, especially when pH = 11 because of the strong electrostatic repulsion between MO and FAI-10. FAI-10 can also effectively decompose another azo dye (rhodamine B (RhB)) and diverse antibiotics (sulflsoxazole (SOX), chlortetracycline hydrochloride (CTC), tetracycline hydrochloride (TC) and ofloxacin (OFX)). The activity enhancement mechanism of FAI-10 has been systemically investigated and is ascribed to the promoted photo-absorption, charge separation and transfer efficiency, and affinity of organic pollutants , owing to the synergistic effect of Fe doping and oxygen vacancy (Ov). The photocatalytic mechanisms and process for decomposing MO are verified and proposed based on radical trapping experiments and liquid chromatography-mass spectrometry (LC-MS). This work opens an avenue for the fabrication of effective photocatalysts toward water purification .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Hongbing Mao,Huijun Wang,Yanyan Xing,Deyong Wang,Xiujun Cao,Jie Yu,Junya Yan
In this work, a boronic acid decorated mesoporous iron-based metal-organic framework (MIL-100(Fe)-B) nanozyme as an efficient immobilization matrix for glucose oxidase (GOx) was designed and prepared through a facile microwave-assisted metal-ligand-fragment co-assembly strategy. Compared with the unboric acid-modified MIL-100(Fe), boron-doped MIL-100(Fe) exhibited enhanced peroxidase-like activity, which was mainly due to the introduced B causing MIL-100(Fe) defects, accelerating mass transfer, facilitating more active sites for H2O2 decomposition. Besides, the MIL-100(Fe)-B nanozyme possessed sufficient recognition sites for immobilizing glucose oxidase with little enzyme leakage to form a cascade nanozyme with both peroxidase-like and cascade catalytic activities. A colormetric biosensor based on the integrated nanozyme reactor (GOx@MIL-100(Fe)-B) was developed for glucose detection. The proposed cascade biosensor had a linear range of 5-150 μM and a limit of detection (LOD) of 0.97 μM (3.3 δ/S). Interestingly, a portable microfluidic paper-based analytic device (μPAD) biosensor based on the cascade nanoplatform was further fabricated for visualized detection of glucose combined with a ColorPicker App on smartphone. It indicated that the integrated nanozyme GOx@MIL-100(Fe)-B was a promising candidate for glucose detection and provided a potentially analytical avenue for biosensing and other applications.
研究领域:
生物化学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2021
·Vol. 2021
·期 38
·3992-3999
·
IF 2.524
Bing-Xue Luo,Yao Pan,Yin-Shan Meng,Qiang Liu,Jun Yin,Tao Liu,Yuan-Yuan Zhu
Graphical A magneto-fluorescent bifunctional Fe(II) complex is synthesized through decoration of the pyrene fluorophore to Fe(II)-pybox moiety. Its magnetic and fluorescent properties are characterized via X-ray structural analyses, magnetic susceptibility measurement, 57 Fe Mössbauer spectroscopy, and fluorescent spectroscopy. As expected, the coexistence of spin-crossover and fluorescence is achieved. The construction of magneto-fluorescent bifunctional complexes is a feasible approach toward multifunctional molecular materials. Herein we report the synthesis and properties studies of a mononuclear Fe(II) complex [Fe L 2 ](ClO 4 ) ( 1 ), where L is a pyridine-2,6-bis(oxazoline) (pybox) ligand decorated by the pyrene fluorophore. Magnetic susceptibility measurement of desolvated complex 1-d shows an incomplete and gradual spin-crossover in the temperature range 50–300 K, which is further confirmed via 57 Fe Mössbauer spectroscopy study. Light-induced excited spin state trapping (LIESST) is also observed below 70 K when the powder sample is irradiated by a 532 nm laser. The change in absorption during the spin-crossover (SCO) process is investigated via the temperature-dependent UV-vis spectroscopy. As expected, through introducing the chromophore, 1 displays fluorescence in both solution and solid state, achieving the coexistence of spin-crossover and fluorescence in one compound.
研究领域:
无机化学
·
分子材料科学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Jiangang Kang,Haihong Zhang,Yuehui He,Liang Wu,Hengdi Ye,Jinchao Wei
The novel Ni-Si intermetallic compounds are fabricated by elemental powder metallurgy. This study explores the synthesis of a series of catalysts (Ni-Si-M, M=Co, Fe, Mn) by alloying to augment the low-temperature efficiency of CO oxidation using Ni-Si intermetallic compounds. It is found the low-temperature catalytic activity of Ni-Si-Co, Ni-Si-Fe, and Ni-Si-Mn catalysts are significantly enhanced compared to the original Ni-Si. The catalytic activity among the catalysts ranks as follows: Ni-Si-Co > Ni-Si-Fe > Ni-Si-Mn > Ni-Si. The apparent activation energy (Ea) for Ni-Si-Co was the lowest at 57.3 kJ/mol, suggesting its efficient catalytic oxidation of CO. Additionally, the addition of Co, Fe and Mn elements actually promotes the generation of Ni 2+ as the CO adsorption site in the original Ni-Si. The addition of Co element also leads to the formation of Co 2+ as the adsorption site of O 2 in the process of CO oxidation reaction. The synergistic adsorption of Ni 2+ and Co 2+ to CO and O 2 promotes the CO oxidation reaction. Additionally, the catalysts demonstrate robust long-term stability in atmospheres containing H 2 O and SO 2 , with CO conversion initially suppressed but subsequently recovering and stabilizing at over 90%. This investigation offers novel insights into enhancing the low-temperature activity and stability of catalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）