SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Qiya Zhou,Juan Luo,Haoxin Wu,Guopeng Zhu,Jing Feng,Zijun Dong,Shichang Sun
To address the issue of water eutrophication caused by low-concentration phosphate in municipal wastewater and overcome the limitations of traditional biochar technologies, this work proposed a new strategy for preparing Fe-modified biochar (FeBC-3) from waste coffee grounds via microwave pyrolysis. This method utilized the rapid and uniform heating characteristics of microwaves to efficiently activate the material, resulting in FeBC-3 with a high specific surface area and abundant pore structure, which was a powerful basis for treating low-concentration phosphate. FeBC-3 demonstrated excellent low concentration phosphate removal capability (99.26 % removal in 2 h), wide pH adaptability (>80 % removal under strong acid and alkali), and excellent anti-disturbance capability. Laboratory-scale continuous flow adsorption tower experiments further confirmed the applicability of FeBC-3, and the Yoon-Nelson model accurately predicted the point at which phosphate permeation reached 50 %. Through advanced characterization and modeling, particularly using density functional theory (DFT) calculations, the inner sphere complex was revealed to be the key mechanism for the efficient adsorption of phosphate by FeBC-3 at the molecular level, providing a new perspective for understanding its mechanism. The present study confirmed that FeBC-3, as a low-cost and environmentally friendly adsorbent, had a great application prospect for the efficient treatment of low concentration of phosphate in municipal wastewater, which brought a new breakthrough in the field of water pollution control.
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高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2025
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IF 6.2
Longfei Wang,Yuanjun Tang,Guoneng Li,Jun Dong,Yao Fang,Wenwen Guo,Chao Ye
This study systematically investigates the effects of Fe-loading on the pyrolysis behavior of three key biomass components: cellulose , xylan , and lignin . Complementary analytical techniques, thermogravimetric analysis (TGA), thermogravimetry-mass spectrometry (TG-MS), and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS), were utilized to assess the impact of Fe-loading on: ( i ) pyrolysis characteristics, ( ii ) the combined pyrolysis index ( CPI ), ( iii ) small-molecule gas evolution, and ( iv ) tar product distribution. Results demonstrate that the loading of Fe(NO 3 ) 3 significantly reduced the initial pyrolysis temperatures of cellulose and xylan by ∼140 °C and ∼62 °C, respectively, resulting in 58 % and 37 % decreases in CPI values. Conversely, lignin exhibited a 111 % CPI increase under Fe loading conditions, attributable to accelerated aryl-ether bond cleavage. The presence of Fe enhanced CO 2 evolution while suppressing H 2 O and CO generation in cellulose / xylan conditions. In contrast, it promoted CH 4 , H 2 , CO, and CO 2 evolution during lignin pyrolysis. Py-GC/MS analysis indicated that the presence of Fe drives aromatization through deoxygenation pathways while inhibiting ring-opening depolymerization, consequently shifting tar composition toward higher-carbon-number aromatic hydrocarbons. The findings can serve as a valuable reference for the application and promotion of the high-value valorization of waste biomass.
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MATERIALS & DESIGN
·
2025
·
IF 7.9
Ran Huang,Lisheng Tang,Lianjiang Tan
This study explores the green and low-cost synthesis of iron-doped zinc oxide nanoparticles (Fe-doped ZnO NPs) using a simple, scalable sol–gel method under mild conditions. The novelty of this work lies in the combination of industrial scalability, eco-friendly processing, and cost-effectiveness, which together enable sustainable production of high-performance nanomaterials. Fe doping was employed to enhance the photocatalytic and antibacterial properties of ZnO by promoting reactive oxygen species (ROS) generation and bandgap narrowing, thereby improving light absorption and antimicrobial efficiency. The synthesis utilized water and ethanol as solvents, ensuring an environmentally benign process that avoids hazardous reagents. The Fe-doped ZnO NPs were characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), confirming the successful incorporation of Fe into the ZnO lattice with well-defined crystalline structures. The nanoparticles exhibited strong antibacterial activity against both Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli, with enhanced inhibition observed at higher Fe concentrations. Furthermore, a preliminary cost analysis demonstrated the economic viability of the sol–gel route for large-scale industrial production. The study highlights the potential of Fe-doped ZnO NPs synthesized via a green, scalable, and cost-effective approach for applications in coatings, food packaging, and biomedical fields.
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高影响因子
CARBON
·
2025
·
IF 11.6
Mingyang Liu,Yinkun Gao,Shuyun Guan,Yongqing Wan,Yiman Ma,Xiaojie Xu,Peng Gao,Yongming Zhu,Xudong Li
Lithium-oxygen batteries (LOBs), with ultrahigh energy density (>3500 Wh kg −1 ), are limited by synergistic degradation (Lithium peroxide (Li 2 O 2 ) passivation, kinetic polarization, mass transport issues) in conventional electrodes. This work proposes a multi-hierarchy electrode architecture combining three-dimensional ordered hierarchically porous carbon matrices (3DOH) and Fe single atoms. The 3DOH carbon, synthesized via templated ZnFe-ZIF pyrolysis, features interconnected macropores (≥200 nm) for rapid ion/oxygen transport and mesopores (2–50 nm) with atomically dispersed Fe-N x sites for bifunctional catalysis. Metal-organic framework (MOF) scaffolds enhance mechanical stability while maintaining conductivity. The design achieves 17334 mAh g −1 capacity at 200 mA g −1 (69.5% enhancement over conventional electrodes) and 132-cycle stability with minimal overpotential degradation (ΔV < 0.93 V). By synergizing macroscopic kinetics and Ångstrom-level reactivity, this architecture offers a scalable paradigm for high-energy, long-life LOBs systems. Future directions include atomic-level mechanistic studies and industrial-scale synthesis.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Cuirong Yan,Hongyan Ma,Xiunan Cai,Zhongqiu Luo,Jinyu Shi,Wenhao Li,Xintao Zhou
High-valent iron-oxo complexes show promise as green oxidants for water remediation, but suffer from critical limitations in stability and pH adaptability. Herein, we report a facile method to synthesize amorphous SiO 2 -stabilized high-valent iron-oxo complexes via Na + diffusion activation of iron/silicon-rich copper smelting slag. In the complex, the synergistic coexistence of two distinct silica‑oxygen tetrahedral configurations-basic Na 2 SiO 3 and acidic SiO 2 oxides establishes a self-regulating pH buffering system that stabilizes solution neutrality. This unique structural design ensures sustained oxidative activity of the complex, representing a significant advancement over conventional silica-supported catalysts due to its intrinsic acid-base regulatory capability. Thus, the deactivations of the oxidants including the proton-induced self-decomposition and the hydrolysis of iron by hydroxyl groups can be efficiently inhibited, thereby expanding the pH applicability (3–11). High-valent iron species can be continuously regenerated during peroxymonosulfate (PMS)-triggered reactions for the selective and efficient oxidation degradation of tetracycline hydrochloride (TC, 98.01% in 15 min) via non-radical pathway. Through methyl phenyl sulfoxide-directed oxidation, electron spin resonance, Mössbauer spectroscopy, and density functional theory calculations, the stabilizing mechanism of silicon was elucidated, confirming that the high valent iron-oxo act as the dominant active species. This work advances both hazardous waste valorization and high valent iron-oxo complex engineering, offering a robust solution for organic pollutant removal in complex aquatic environments.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2025
·
IF 2.9
Yulong Deng,Jiacheng Zheng,Wenting Chen,Xu Wang,Chengliao Deng,Xiaoming Cai,Jinming Cai,Honglin Tan
NH3 selective catalytic reduction (SCR) is a promising method for NOx removal, but its low-temperature effectiveness and narrow operating window limit industrial use. This study demonstrates, through DFT calculations and experimental validation, that Fe-doped CoMn2O4 (CoFe0.1Mn1.9O4) catalysts can effectively enhance catalytic activity. Through the in-depth study of NH3-SCR, it was found that the NH3 adsorption on the catalyst surface might be significantly enhanced by the doping of Fe (Eads = −1.29 eV → −1.42 eV), and it was also further demonstrated that the NH3 had a better adsorption energy on the surface of the CoFe0.1Mn1.9O4 catalyst through the electron difference density (EDD) and partial density of states (PDOS). In addition to this, the CoFe0.1Mn1.9O4 catalyst not only reduces the first step of the dehydrogenation reaction of NH3 (Eα = 0.86 eV → 0.83 eV), but also lowers the energy barrier of the NH3-SCR (Eα = 1.11 eV → 0.86 eV). All these calculations demonstrate that Fe doping has the potential to significantly enhance catalytic performance. CoMn2O4 and Fe-doped CoMn2O4 (CoFe0.02Mn1.98O4) catalysts were synthesized using sol–gel and impregnation techniques, respectively. Through characterization and performance testing, CoFe0.02Mn1.98O4 is found to exhibit a more efficient NOx conversion (87% at 250 °C), and its N2 selectivity is also slightly improved (64%), which matches with the calculation results. In this study, a method to improve the denitrification efficiency of CoMn2O4 spinel catalysts was proposed, which provides a new idea for the development of CoMn2O4 catalysts.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Shuangjiang He,Junchang Wang,Chong Wang,Xiao Zhang,Sen Liang
The Mn-Fe-Co-Zn-O series is a widely used thermistor material, but its thermal stability is compromised by nitrogen glass encapsulation, limiting its application in electrical devices. To address this issue, La 2 O 3 and Y 2 O 3 were used as rare earth oxide dopants, and xR 2 O 3 -Mn 0.76 Fe 0.87 Co 1.07 Zn 0.3 O 4 (x = 0.0025, 0.005, 0.01, 0.02) negative temperature coefficient (NTC) materials were synthesized via solid-state sintering. The effect of rare earth doping on the electrical properties after high-temperature nitrogen annealing was investigated. After annealing at 750°C for 4 h, the variation in resistivity ( ρ 25 ) and material constant ( B 25/50 ) significantly decreases with increasing La doping. For the La-doped sample (x = 0.01), Δρ 25 decreased to 7.77% and ΔB 25/50 to 0.77% (for the Y-doped sample (x = 0.01), Δρ 25 decreased to 22.76% and ΔB 25/50 to 1.91%), compared to the undoped sample, where Δρ 25 reduced by 168.84% and ΔB 25/5 0 by 5.57%. This improvement was attributed to rare earth accumulation at grain boundaries, filling voids and forming R-O bonds, which inhibited oxygen vacancy migration and significantly reduced grain boundary resistance. Rare earth doping effectively improved the thermal stability and electrical consistency of NTC thermistor ceramics in high-temperature nitrogen atmospheres, offering a new strategy for high-temperature encapsulation applications. (Y-doped samples showed similar results, as detailed in the Supplementary Materials.)
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Bo Chen,Lingmei Zhang,Jie Gao,Xiaofei Gao,Jin Huang,Yangming Ou,Hongbin Wang
The combined pollution of antibiotics and heavy metals exacerbates dissemination of antibiotic resistance genes (ARGs). However, simultaneously and efficiently removing both pollutants with traditional adsorbents is highly challenging because of their limited number of active sites. Based on a multi-site synergy strategy, powdered NH 2 -MIL-101(Fe) was encapsulated into porous calcium alginate (CA) aerogel to produce a novel NH 2 -MIL-101(Fe)@CA composite that overcomes the above shortcomings. NH 2 -MIL-101(Fe) and CA act synergistically to enhance the adsorption of ciprofloxacin (CIP) and Cu 2+ by providing multiple sorption sites (e.g., -COOH, -OH, -NH 2 , and aromatic ring). Both pollutants exhibit the same optimal pH in their individual systems, enabling simultaneous and efficient removal from their mixed solution. At 25 °C, the maximum CIP adsorption capacity reaches up to 1072.06 mg/g, surpassing that of most recently reported adsorbents. Electrostatic attraction, complexation, hydrogen bond, and π-π EDA interactions are all shown to contribute to CIP and Cu 2+ removal. Intriguingly, in CIP/Cu 2+ binary system, Cu 2+ inhibits CIP adsorption because of competitive effects and formation of Cu(CIP ± ) 2+ complexes in aqueous solution. Conversely, Cu 2+ adsorption increases by 62.4 % in the presence of CIP, because the pre-adsorbed CIP supplies additional coordination sites (-COOH, -OH, and C O) for Cu 2+ to form adsorbent-CIP-Cu 2+ ternary complex. In-situ characterization and sequential adsorption experiments verify these interaction patterns. Moreover, the resultant composite achieves simultaneous removal rate of approximately 90 % for CIP and Cu 2+ in simulated wastewater, demonstrating its great potential for treating complex water matrices. This work provides theoretical guidance for designing versatile adsorbents that target antibiotics and heavy metals and offers new insights into interactions between multiple co-existing pollutants.
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Nano Energy
·
2021
·
IF 17.881
Yiyan Wang,Zongge Li,Peng Zhang,Yuan Pan,Ying Zhang,Qiong Cai,S. Ravi P. Silva,Jian Liu,Guoxin Zhang,Xiaoming Sun,Zifeng Yan
Carbon nanofiber (CNF) papers have been widely used in many renewable energy systems , and the development of its catalytic function is of great significance and a major challenge. In this work, we pioneer a time- and cost-efficient strategy for the preparation of large-area flexible CNF films with uniformly distributed diatomic FeN 3 -CoN 3 sites (Fe 1 Co 1 -CNF). Due to the excellent compatibility and similar functionality of the pre-designed ZnFeCo-NC precursors (ZnFeCo-pre) with the electrospun polymer polyacrylonitrile (PAN), the mixture of ZnFeCo-pre and PAN can be co-electrospun and subject to a standard CNF fabrication process. The resulting Fe 1 Co 1 -CNF exhibits excellent bifunctional catalytic performance for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), attributing to the abundant dual catalytic FeN 3 -CoN 3 sites which are mutually beneficial for attaining optimal electronic properties for the adsorption/desorption of reaction intermediates. The assembled liquid-electrolyte ZAB provides a high specific power of 201.7 mW cm −2 and excellent cycling stability. More importantly, due to the good mechanical strength and flexibility of Fe 1 Co 1 -CNF, portable ZAB with exceptional shape deformability and stability can be demonstrated, in which Fe 1 Co 1 -CNF utility as an integrated free-standing membrane electrode. These findings provide a facile strategy for manufacturing flexible multi-functional catalytic electrodes with high production.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Yandi Hu,Xulin Jiang,Suona Zhang,Dawei Cai,Zehao Zhou,Chuan Liu,Xiaobing Zuo,Sang Soo Lee
Iron/chromium hydroxide coprecipitation controls the fate and transport of toxic chromium (Cr) in many natural and engineered systems. Organic coatings on soil and engineered surfaces are ubiquitous; however, mechanistic controls of these organic coatings over Fe/Cr hydroxide coprecipitation are poorly understood. Here, Fe/Cr hydroxide coprecipitation was conducted on model organic coatings of humic acid (HA), sodium alginate (SA), and bovine serum albumin (BSA). The organics bonded with SiO2 through ligand exchange with carboxyl (–COOH), and the adsorbed amounts and pKa values of –COOH controlled surface charges of coatings. The adsorbed organic films also had different complexation capacities with Fe/Cr ions and Fe/Cr hydroxide particles, resulting in significant differences in both the amount (on HA > SA(–COOH) ≫ BSA(–NH2)) and composition (Cr/Fe molar ratio: on BSA(–NH2) ≫ HA > SA(–COOH)) of heterogeneous precipitates. Negatively charged –COOH attracted more Fe ions and oligomers of hydrolyzed Fe/Cr species and subsequently promoted heterogeneous precipitation of Fe/Cr hydroxide nanoparticles. Organic coatings containing –NH2 were positively charged at acidic pH because of the high pKa value of the functional group, limiting cation adsorption and formation of coprecipitates. Meanwhile, the higher local pH near the –NH2 coatings promoted the formation of Cr(OH)3. This study advances fundamental understanding of heterogeneous Fe/Cr hydroxide coprecipitation on organics, which is essential for successful Cr remediation and removal in both natural and engineered settings, as well as the synthesis of Cr-doped iron (oxy)hydroxides for material applications.
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高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 8
·618
·
IF 4.3
Ting Liu,Yun Wu,Hao Wang,Jichang Lu,Yongming Luo
The urgent need for sustainable CO2conversion technologies has driven the development of advanced photocatalysts that harness solar energy. This study employs a CTAB-assisted solvothermal method to fabricate a Z-scheme heterojunction Fe-MOFs/VO-Bi2WO6(FM/VO-BWO) for photocatalytic CO2reduction. Positron annihilation lifetime spectroscopy (PALS) was employed to confirm the existence of oxygen vacancies, while spherical aberration-corrected transmission electron microscope (STEM) characterization verified the successful construction of heterointerfaces. X-ray absorption fine structure (XAFS) spectra confirmed that the defect configuration and heterostructure changed the surface chemical valence state. The optimized 1.0FM/VO-BWO composite demonstrated exceptional photocatalytic performance, achieving CO and CH4yields of 60.48 and 4.3 μmol/g, respectively, under visible-light 11.8- and 1.5-fold enhancements over pristine Bi2WO6. The enhanced performance is attributed to oxygen vacancy-induced active sites facilitating CO₂ adsorption/activation. In situ molecular spectroscopy confirmed the formation of critical CO2-derived intermediates (COOH* and CHO*) through surface interactions involving four-coordinated and two-coordinated hydrogen-bonded water molecules. Furthermore, the accelerated interfacial charge transfer efficiency mediated by the Z-scheme heterojunction has been conclusively demonstrated. This work establishes a paradigm for defect-mediated heterojunction design, offering a sustainable route for solar fuel production.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yihong Wu,Lei Song,Maofeng Shi,Chuhan Gu,Jiaxian Zhang,Jingyu Lv,Lili Xuan
Despite the strict management of eutrophic waters globally, the release of phosphorus (P) from sediments maintains the eutrophic state of water bodies and poses a serious challenge to their management. Ca/Fe–LDH was synthesized with natural zeolite (NZ) by using a co-precipitation method (denoted as CFL-Z) to solve this problem. Results showed that Ca/Fe–LDH was successfully loaded onto the surface and inside the pores of NZ. The maximum P adsorption capacity value of CFL-Z was 46.7 mg/g under the mechanisms of electrostatic attraction, ligand exchange, and ion exchange. In incubation experiments, the addition of 6 % CFL-Z into P-contaminated sediments reduced P concentrations in overlying and interstitial water to 0.013 (97.3 % reduction) and 0.358 (82.1 % reduction) mg/L, respectively. In addition, unstable P forms (NH 4 Cl-P and BD-P) in sediments were converted into stable P forms (HCl-P and Res-P, respectively). Subsequent long-term anoxic experiments showed that CFL-Z capping sediments exhibited better inhibition of sediment P release compared with CFL-Z amendment sediments and was efficient and stable. Microbial community analysis showed that CFL-Z amendment and capping reshaped the microbial community structure, and different functional bacteria influenced the stability of sediment P. This work showed that CFL-Z overlays were considered to have potential applications in sediment P fixation, providing a new way to improve the P-binding capacity of natural mineral-like materials and resolve P-contaminated sediments.
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