JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2025
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IF 6.2
Huimin Mao,Zhengye Chen,Hong Tian,Shan Cheng,Lei Liu,Yanni Xuan,Yanshan Yin
Wheat straw (WS) baked at 260°C is used as raw material. The HZSM-5 was modified through alkali treatment (NaOH) and metal loading (Ni, Fe), followed by the introduction of MCM-41 layers onto the modified HZSM-5 to synthesize composite pore zeolites. A tubular furnace and Py-GC/MS were used to investigate the effects of different composite pore catalysts on the three-phase products and the distribution of bio-oil components during the catalytic fast pyrolysis(CFP) of WS. The use of 1 %FeAZ@M as a catalyst achieved the highest bio-oil yield (31.31 %). Introducing the micro-meso composite pore zeolite 0.3AZ@M as a catalyst resulted in the highest selectivity of monocyclic aromatic hydrocarbons (MAHs) in the bio-oil from WS CFP (52.12 %), along with a bio-oil yield of 26.50 %. The metal-modified composite pore zeolites exhibit enhanced acidity, which can further enhance the composition distribution in the bio-oil. The use of 1 %NiAZ@M as a catalyst resulted in the highest production of MAHs in the bio-oil from WS of CFP (60.67 %), with a bio-oil yield of 23.27 %. Among the bimetal-modified composite pore zeolites, 1 %Ni1 %FeAZ@M demonstrated the highest selectivity for MAHs, with MAHs in the bio-oil reaching 66.36 %, while the bio-oil yield increased to 28.41 %.
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JOURNAL OF MOLECULAR STRUCTURE
·
2024
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IF 4
Bing Zhang,Yixin Luo,Binqiong Peng,Lisha Zhang,Ning Xie,Dan Yue,Weidong Li,Bowen Qin,Wenjing Du,Zhenling Wang,Yilei Zhang
The paper presents a green and easily prepared water-soluble fluorescent nitrogen doped carbon dots (N CDs) synthesized by one-step hydrothermal process. The N CDs displays brilliant blue fluorescence excited by UV light, with excellent water solubility, and a quantum yield of 15.7 %. The fluorescence intensity of N CDs remains unchanged after 48 h of exposure to ultraviolet light, exhibiting good photostability. Moreover, the ion sensing characteristics of these N CDs have been explored for more than a dozen anions and cations. The result reflects that this fluorescent CDs exhibits excellent sensitivity and selectivity for Fe 3+ within a range spanning of 40 ∼ 500 μΜ with a limit of detection down to 0.22 μΜ. The principle of sensor sensing is likely related to the formation of the internal filtering effect (IFE), which leads to a decline in the fluorescence intensity of N CDs in aqueous solutions containing Fe 3+ . Due to the excellent water solubility, good photostability and high yield of N CDs, the application of prepared N CDs/polyvinyl alcohol (PVA) as fluorescent materials for white LED devices was explored. The prepared N CDs/PVA (NCP) composite film can also exhibit bright blue light under 365 nm excitation, indicating good application prospects in the area of white LED devices and agricultural films.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Xing Li,Lei Xing,Chunyu Zhang,Shudan He,Fanghua Liu,Zhen Chen,Huazhen Chang,Junhua Li
Catalytic solvent regeneration is widely considered a promising solution for addressing the intensive heat duty of amine-based carbon dioxide (CO 2 ) capture. This highly challenging application has motivated researchers to develop excellent catalysts with high activity and durability. In this study, we engineered active and durable Fe − N − C catalyst coated with high-graphitization carbon layers (labeled Phen − Fe − N − C) through a secondary thermal pyrolysis treatment. The multiple graphite layers and atomic metal sties were verified by experimental characterization and coordination structure analysis. The improved graphite layers further enhanced the activity of Fe − N − C sites, providing more acid sites for proton-electron transfer and C − N breaking during solvent regeneration (or CO 2 desorption). Thus, the maximal CO 2 desorption rate increased by 50 % when Fe − N − C was used compared with that of the blank case, and the rate further increased by 27 % when Phen − Fe − N − C was used. After 15 days of hydrothermal testing, the single Fe atom over the spent catalysts presented no significant aggregation or dissolution in the solvent, validating the durability of Phen − Fe − N − C. This work demonstrates a feasible and novel strategy to improve M − N − C materials for efficient and robust CO 2 desorption from amine solvents toward energy-saving CO 2 capture.
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CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Siyuan Sun,Fan Yang,Xiaoyun Zhang,Jinxiu Qian,Kexin Wei,Junpu An,Yang Sun,Shuyang Wang,Xi Li,Yongfeng Li
Transition metal single-atom catalysts (SACs) have been widely used in oxygen reduction reactions (ORR) and oxygen evolution reaction (OER) due to its greatest atomic utilization and low costs, which catalytic performance can be further enhanced by electron distribution adjustment. Herein, we synthesized a carbon-encapsulated FeS/Fe 3 C nanoparticles doped carbon-based Fe single atom catalyst from fluid catalytic cracking (FCC) slurry though a one-pot pyrolysis. The synergistic effect between FeS/Fe 3 C nanoparticles and Fe single atom structure (FeN x ) promotes the ORR/OER processes, which may due to the reduction of the adsorption free energy of intermediates. Meanwhile, the polyaromatic hydrocarbon in FCC slurry enhances the graphitization of catalyst to facilitate charge transfer in electrocatalysis process, and the carbon-encapsulated nanoparticles sites possess higher stability and dispersion. As a result, the optimized catalyst (FeS/Fe 3 C@Fe-N-C) presents a high nanoparticles dispersion and graphitization level, which has a higher ORR catalytic ability (E 1/2 = 0.91 V vs RHE) compared with commercial Pt/C (20 wt%, E 1/2 = 0.879 V vs RHE) and a similar OER catalytic ability (E 10 = 0.1.506 V vs RHE) compared with RuO 2 (E 10 = 1.518 V vs RHE). A liquid Zn-air battery assembled with FeS/Fe 3 C@Fe-N-C show a peak power density of 113 mW cm −2 and an open potential of 1.432 V. This work sheds light on a new method to design transition metal active sites carbon based single-atom catalyst for enhanced ORR and OER processes.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Jiajia Tai,Quanxiong Lu,Xianliang Song
The progress in developing inexpensive and highly effective catalysts is vital for overcoming the current limitations of oxygen reduction reaction (ORR) and the practical application of fuel cells. This study constructed a three-dimensional (3D) composite catalyst using etra-β-(8-quinolinoxy) iron phthalocyanine (EFePc) as the sites of catalytic activity, nitrogen-doped reduced graphene oxide (NRGO) as the basal plane, and oxidized carbon black (OCB) as the intercalating agent. The morphological and structural characteristics of the composite catalyst were thoroughly analyzed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, Brunauer-Emmett-Teller (BET) surface area analysis, Fourier-transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). Evidence from the results suggested that the 3D catalyst has been synthesized successfully. The EFePc-NRGO/OCB exhibited a half-wave potential (E 1/2 ) of 0.80 V, closely approximating those of commercial Pt/C (20 wt%). The average electron transfer number was 3.77, indicating a 4-electron transfer process. Furthermore, when the catalyst was applied to direct lignin fuel cells (DLFCs), the maximum power density reached 247.87 mW/m² which far exceeded Pt/C (53.13 mW/m²). This offers a novel perspective for the advancement of high-efficiency non-noble metal catalysts and the high-value utilization of lignin.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Guitao Zhang,Kaicai Fan,Lingbo Zong,Fenghong Lu,Zumin Wang,Lei Wang
To achieve precise optimization of the geometric structure and control over spatial distribution of single atom active sites, we introduce an in situ polymer layer modification strategy. Through co-deposition of tannic acid (TA) and polyethyleneimine (PEI) on carbon nanotubes (CNTs), the polymer improves the dispersion and prevents the agglomeration of Fe atoms. Consequently, after controlled calcination, the geometrically distorted Fe-N 4 single atom active sites are constructed on the surface of the curved carbon support. The optimized distortion reduces the reaction energy barrier, optimizes the adsorption energy of oxygen intermediates, and leading to a remarkable improvement of oxygen reduction reaction (ORR) activity. As the result, the obtained single atom catalyst (SAC) Fe-NC@CNTs exhibits exceptional performance with a large onset potential ( E onset ) of 1.03 V and a half-wave potential ( E 1/2 ) of 0.91 V in 0.1 M KOH solution, surpassing the previously reported ORR electrocatalysts. Benefitting from these features, Fe-NC@CNTs-based rechargeable aqueous Zn-air battery (A-ZAB) delivers a higher power density of 209.5 mW cm −2 and can sustain stable changing/discharging for over 2000 h and experiences negligible charge–discharge potential gap fluctuation, being the most booming competitor among the reported electrocatalysts. Furthermore, quasi-solid-state Zn-air battery (QSS-ZAB) with Fe-NC@CNTs air cathode exhibits an impressive peak power density of 130.8 mW cm −2 , large round-trip efficiency of 82 %, and long cycling life of over 100 h. Our work reveals the relationship of strain-induced geometrical distortion and the structure activity relationship, offering a new way for the rational design of other highly efficient catalytic systems.
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MICROCHEMICAL JOURNAL
·
2025
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IF 5.1
Renjie Wang,Yifan Zhu,Shanshan Liu,Kai Jiang,Runan Wang,Shuangshuang Ji,Mengyao Ma,Qianqian Chen,Huijuan Ran,Xudong Song
Uric acid (UA) levels serve as pivotal health biomarkers, underscoring the need for accurate detection methodologies. This paper presents a novel and straightforward electrochemical approach for UA detection, utilizing a sensing platform that integrates hybrid electrodes of Fe-MOF and polypyrrole (PPy). The findings reveal that the sensor shows exceptional sensitivity to UA across a wide concentration range of 1–300 µM, featuring an impressively low limit of detection (LOD) at 0.212 µM. Moreover, the sensor retains a peak current response of 87.2 % even after one month, underscoring its excellent stability and robust anti-interference properties. The improved sensing performance is due to the composite material’s retention of PPy’s superior electronic transport characteristics, combined with the enhanced specific surface area, active sites, and porosity contributed by the Fe-MOF component, leading to a substantial enhancement in electrochemical sensing capabilities. This research paves the way for the utilization of MOF nanomaterials in electrochemical sensing, thereby facilitating the practical application of nanocomposites.
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CHEMOSPHERE
·
2024
·
IF 8.1
Jingyuan Yue,Xiaojin Hu,Huijun Xie,Zhen Hu,Haiming Wu,Jian Zhang,Bo Sun,Lushan Wang
Bisphenol A (BPA) in seawater tends to be deposited in coastal sediments. However, its degradation under tidal oscillations has not been explored comprehensively. Hydroxyl radicals (·OH) can be generated through Fe cycling under redox oscillations, which have a strong oxidizing capacity. This study focused on the contribution of Fe-mediated production of ·OH in BPA degradation under darkness. The removal of BPA was investigated by reoxygenating six natural coastal sediments, and three redox cycles were applied to prove the sustainability of the process. The importance of low reactivity Fe(II) in the production of ·OH was investigated, specifically, Fe(II) with carbonate and Fe(II) within goethite, hematite and magnetite. The degradation efficiency of BPA during reoxygenation of sediments was 76.78–94.82%, and the contribution of ·OH ranged from 36.74% to 74.51%. The path coefficient of ·OH on BPA degradation reached 0.6985 and the indirect effect of low reactivity Fe(II) on BPA degradation by mediating ·OH production reached 0.5240 obtained via partial least squares path modeling (PLS-PM). This study emphasizes the importance of low reactivity Fe(II) in ·OH production and provides a new perspective for the role of tidal-induced ·OH on the fate of refractory organic pollutants under darkness.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Bolong Liang,Ming Su,Zhe Zhao,Shu-xuan Liang
Microbial fuel cell (MFC), simultaneously degrading organic pollutants and harvesting electricity, suffers from a sluggish oxygen reduction reaction (ORR) on cathode. The catalysts for Pt substitution are crucial to enhance the ORR performance and power output. Thus, a Co and Fe co-doped carbon derived from ZIF-67 (Co/Fe-NC) is prepared, which is proved to have excellent electrochemical properties. When the catalyst Co/Fe-NC is equipped in microbial fuel cell, the maximum power density of 1831 ± 57 mW m −2 is achieved, which is 13.5 % higher than that of Fe@Co-NC and 49.3 % higher than that of Co-NC. Moreover, the electrochemical tests show that Co/Fe-NC has a smaller charge transfer resistance and a higher exchange current density, which implies the faster kinetics of ORR. The enhanced performance of Co/Fe-NC can be attributed to the rougher rhombic dodecahedral interface, larger surface area, various types of nitrogen species, critical roles of cobalt and iron species, both high graphitization and defects. All these characteristics are responsible for the significant increase in ORR activity and power output. This work designs and compares different catalysts derived from iron-involved ZIF-67, and demonstrates a superior ORR electrocatalyst of Co/Fe-NC, which can be a potential alternative to Pt in the MFC practical application.
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Journal of Geophysical Research-Biogeosciences
·
2025
·Vol. 130
·期 3
·e2024JG008675
·
IF 3.5
Zhengqi Su,Huaming Guo,Zhipeng Gao,Tiantian Ke,Xiaojun Feng,Lingzhi Zhang
Although the reduction of pentavalent arsenic (As(V)) bound to Fe(III) (hydr)oxides (As(V)-containing FeOOH) coupled with organic matter (OM) degradation has received extensive attention, little is known about in situ reduction of FeOOH mineral-bound As(V) (As(V) (s) ) via electron shuttling in the presence of As(V)-reducing bacteria (AsRB). Here, anthraquinone-2,6-disulfonate (AQDS), Suwannee River humic acid (SRHA), and fulvic acid (SRFA) were used to establish an agar electron shuttle system with ferrihydrite-As(V)/goethite-As(V) and AsRB, which was isolated from high-As groundwater as the candidate strain (RA-1). We found that AQDS was more efficient in shuttling electrons to reduce As(V) (s) and Fe(III) than SRHA and SRFA. High contents of quinone moieties in AQDS indicated that quinone moieties were conducive to As(V) (s) and Fe(III) reduction. The reduction kinetic rates ( K red ) of As(V) (s) were higher than those of Fe(III), indicating the occurrence of in situ As(V) (s) reduction via electron shuttling. Furthermore, K red of As(V) (s) for ferrihydrite-As(V) systems was greater than that of goethite-As(V) systems, demonstrating that As(V) bound to ferrihydrite via monodentate was more easily reduced than that bound to goethite via bidentate. The relative expression levels of As metabolic genes ( ars C, arr A, and ars B) initially increased and then decreased in the late stage of experiments. High As concentrations in suspension inhibited the transcriptional activity of As metabolic genes in the late stage, reducing the electron production efficiency of RA-1 and subsequently slowing in situ reduction of As(V) (s) . This study highlights the importance of OM electron shuttling in the reduction of As(V) (s) , offering new perspectives in As enrichment in groundwater. Plain Language Summary OM can promote microbial As(V) reduction in high As groundwater systems. As a result, we explored how FeOOH mineral-bound As(V) could be in situ reduced via electron shuttling between AsRB and different OM. Our findings showed that AQDS was more effective than other two natural organic matter (NOM, i.e., SRHA and SRFA) in reducing both As(V) (s) and Fe(III), due to its high content of quinone moieties. The results of kinetic analysis demonstrated in situ reduction of As(V) (s) , and As(V) bound to ferrihydrite was more readily reduced than As(V) bound to goethite. In addition, the transcriptional activities of three As metabolic genes initially increased but later declined due to high As concentrations, which further slowed the As(V) (s) reduction process. Overall, these findings provide new insights into organic-mediated As cycling in contaminated groundwater. Key Points High quinone contents in AQDS led to a higher reduction extent of As(V) (s) than in SRHA and SRFA The values of K red, As were greater than those of K red, Fe , demonstrating in situ reduction of As(V) (s) Changes in As metabolic genes affected the electron production efficiency of RA-1 and As(V) (s) reduction
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xiaotong Yang,Kaiyu Dong,Zhe Zheng,Yuehuan Zhang,Qiang Yuan
Efficient C C bond cleavage and the complete oxidation of alcohols are key to improving the efficiency of renewable energy utilization. Herein, we successfully prepare porous Fe-doped hexagonal close-packed ( hcp )-PtBi/face-centered cubic ( fcc )-Pt heterostructured nanoplates with abundant grain/phase interfaces ( h -PtBi/ f -Pt@Fe 1.7 PNPs) via a simple solvothermal method. The open porous structure, abundant grain/phase interface and stacking fault defects, and the synergistic effect between intermetallic hcp -PtBi and fcc -Pt make h -PtBi/ f -Pt@Fe 1.7 PNPs an effective electrocatalyst for the glycerol oxidation reaction (GOR) in direct glycerol fuel cells (DGFCs). Notably, the h -PtBi/ f -Pt@Fe 1.7 PNPs exhibit an excellent mass activity of 7.6 A mg Pt −1 for GOR, 4.75-fold higher than that of commercial Pt black in an alkaline medium. Moreover, the h -PtBi/ f -Pt@Fe 1.7 PNPs achieve higher power density (125.8 mW cm −2 ) than commercial Pt/C (81.8 mW cm −2 ) in a single DGFC. The h -PtBi/ f -Pt@Fe 1.7 PNPs can also effectively catalyze the electrochemical oxidation of 1-propanol (17.1 A mg Pt −1 ), 1,2-propanediol (7.2 A mg Pt −1 ), and 1,3-propanediol (5.2 A mg Pt −1 ). The in-situ Fourier-transform infrared spectra further reveal that the C C bond of glycerol, 1-propanol, 1,2-propanediol, and 1,3-propanediol was dissociated for the complete oxidation by the h -PtBi/ f -Pt@Fe 1.7 PNPs. This study provides a new class of porous Pt-based heterostructure nanoplates and insight into the intrinsic activity of different C3 alcohols.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 21
·12712-12720
·
IF 10.7
Tianhao Yu,Peng Gao,Hong Du,Ling Dong
Metal–organic frameworks (MOFs) have recently been reported as promising catalysts for the oxygen evolution reaction (OER). Hence, we chose hydroxyl-rich 2,5-dihydroxyterephthalic acid as the ligand to prepare a novel MIL-100 and wrapped it on the NiCo-ZIF-67 surface to obtain an amorphous hollow material (NiCo-ZIF-67@Fe-MIL-100, denoted as NiCo-ZIF@MIL). The composite material presents a low overpotential (η ≈ 139 mV @ 10 mA cm−2), a small Tafel slope (119 mV dec−1) and great stability for the OER in 1 M KOH solution. Density Functional Theory (DFT) calculations show that the hydroxyl-rich structure, which accelerates OH− transfer and promotes the formation of the Co–O–Fe bridge, effectively reduces the reaction energy barrier (from 2.67 eV for NiCo-ZIF-67 to 2.08 eV for NiCo-ZIF@MIL). This work provides an important reference for the development of double-MOF materials.
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