查找使用阿拉丁产品的科研文献

Room-temperature synthesis of Fe/Cu-BTC for effective removal of tetracycline antibiotic from aquatic environments

Wei Xiang,Yueting Liao,Jinwei Cui,Yangyang Fang,Bining Jiao,Xuesu Su

Antibiotic adsorbents are getting significant attention due to the hazards posed by the accumulation of tetracycline antibiotics in water, which can adversely impact human and environmental health. Bimetallic organic frameworks (BMOFs) exhibit considerable potential in adsorption owing to their dense pore structures and synergistic effects. However, synthesizing efficient, low-cost, and easy-to-prepare BMOFs faces several challenges. Here, we describe the practical synthesis of a series of Fe/Cu-bimetallic organic frameworks (Fe/Cu-MOFs) using simple room-temperature aqueous solvent methods. The pore size structure of Fe/Cu-MOFs is determined by the Fe/Cu ratio employed in the synthesis process. Remarkably, when the Fe/Cu molar ratio was 1:2, the void ratio of Fe/Cu-MOFs increased to 0.7326 cm 3 /g, with a predominant mesoporous structure, and the maximum tetracycline (TC) adsorption capacity exhibited by Fe/Cu-BTC-1/2 was reported at a Q max of 1130.23 mg/g. The adsorption kinetics followed the quasi-second-order kinetic model, and the adsorption isotherms were consistent. The Fe/Cu-BTC-1/2 was effective throughout a wide pH range (6.0–10.0), exhibiting resilience against ionic interference and enabling recycling. The predominant mechanisms of TC adsorption by Fe/Cu-BTC-1/2 include coordination, vacancy filling, and π-π stacking. Thus, our research provides an excellent adsorbent for TC antibiotics and novel insights into the simple synthesis of BMOFs and their application in environmental remediation.

Regulating N-doped biochar with Fe-Mo heterojunctions as cathode in long-life zinc-air battery

Xiao-ru Meng,Shuai Gao,Nianxi Liu,Pei-dong Wu,Zhen Fang

Carbonaceous electrode loaded nano Mo 2 C-Fe 3 N@NCF was synthesized by solvothermal and pyrolysis from soybean straw for high-performance zinc-air batteries (ZABs). The empowered ZAB achieved 1.51 V open-circuit voltage, 88.40 mW cm −2 power density and over 1150 h cycle life. Density functional theory analysis indicates that charge transfer from Mo 2 C-Fe 3 N heterogeneous structure to N-doped biochar can significantly reduce the reaction barrier for oxygen reduction/evolution reactions, enhancing the adsorption of oxygen intermediates. Cellulose-derived carbon provides a large specific surface area, and N-doping enhances the conductivity of the resultant biochar, which both play a crucial role in the efficient loading of Fe and Mo active sites. This work inspires the design and application of interfacial engineering on low-cost biochar carriers.

Roughing Nitrogen-Doped Carbon Nanosheets for Loading of Monatomic Fe and Electroreduction of CO2 to CO

Yuxuan Liu,Yufan Tan,Keyi Zhang,Tianqi Guo,Yao Zhu,Ting Cao,Haiyang Lv,Junpeng Zhu,Ze Gao,Su Zhang,Zheng Liu,Juzhe Liu

The catalyst is the pivotal component in CO2electroreduction systems for converting CO2into valuable products. Carbon-based single-atom materials (CSAMs) have emerged as promising catalyst candidates due to their low cost and high atomic utilization efficiency. The rational design of the morphology and microstructure of such materials is desirable but poses a challenge. Here, we employed different Mg(OH)2templates to guide the fabrication of two kinds of amorphous nitrogen-doped carbon nanosheet-supported Fe single atoms (FeSNC) with rough and flat surface structures. In comparison to flat FeSNC with saturated FeN4sites, the rough FeSNC (R-FeSNC) exhibited unsaturated FeN4−xsites and contracted Fe-N bond length. The featured structure endowed R-FeSNC with superior capacity of catalyzing CO2reduction reaction, achieving an exceptional CO selectivity with Faradaic efficiency of 93% at a potential of −0.66 V vs. RHE. This study offers valuable insights into the design of CSAMs and provides a perspective for gaining a deeper understanding of their activity origins.

S2−-modified Hetero MOF-on-MOF of Ni-MOF/Fe-MOF with Efficient Seawater Oxidation Performance

Haifeng Ru,Yanji Bao,Yifeng Wang,Xiaohong Wang,Jinchun Tu,Qiang Wu,Yi Li,Lei Ding

Direct seawater electrolysis offers a viable solution to the excessive consumption of fresh water resources in existing industrial electrolytic water processes. However, electrolysis efficiency and material stability are affected by electrode material corrosion caused by chlorine evolution reactions (CER) at the anode positions. In this study, the prepared S-Ni-MOF/Fe-MOF material exhibits an exceptional performance in the oxygen evolution reaction (OER) both in alkaline solution and seawater. Specifically, the material achieves low overpotentials of 281 and 279   mV in 1.0   M KOH and alkaline seawater at 100   mA   cm −2 current density, and maintains stability for at least 100   h in both electrolyte solutions. The electronic structure of MOF-on-MOF was modulated through the introduction of S 2− , which induced a large number of vacancies. Furthermore, the reconstruction process on the material surface was accelerated by the formation of NiOOH and FeOOH, that served as protective layers and prevented the corrosion of the electrode material by Cl − , thereby enhancing its stability in seawater. Furthermore, computational studies have indicated that the Fe-Ni active sites at the heterointerface exhibit a synergistic effect, which has been confirmed by density functional theory (DFT) calculations. These results prove that this combination significantly reduces the energy barrier associated with the OER. Consequently, the reaction process is accelerated.

Seeking the adsorption of tetracycline in water by Fe-modified sludge biochar at different pyrolysis temperatures

Jin Hanyu,Song Zhongxian,Luo Yulong,Mao Yanli,Yan Qun,Huang Zhenzhen,Kang Haiyan,Yan Xu,Xing Jiajing,Wu Yongle

The composite material SBC-Fe-x with sludge and Fe 3+ was developed by different calcination temperatures (600, 700, and 800 °C) for the removal of tetracycline (TC). The adsorption rates of SBC-Fe-600, SBC-Fe-700, and SBC-Fe-800 were 77.5%, 89%, and 91%, respectively. Furthermore, the Langmuir model indicated that the maximum adsorption capacity of SBC-Fe-700 (157.93 mg/g) was three times greater than that of SBC-Fe-600. The conclusions were confirmed by a series of characterizations that SBC-Fe-700 showed a larger specific surface area, well-developed pore structure, rich oxygen-containing functional groups and a high degree of graphitization. The results of pH experiments indicated the broad applicability of SBC-Fe-700 for TC adsorption. In addition, SBC-Fe-700 suggested outstanding performance in different water environments. This work produced a feasible adsorbent for the removal of TC, and a new direction for sludge resource utilization was proposed.

TiO2-Doped Fe-Tailings Heterogeneous Catalysts: Engineering Synergistic Photocatalytic-Fenton Pathways for High-Efficiency Phenol Mineralization

Zhang Wen-hao,Wei Yu,Yu Qi,Wang Chun-heng,Lei Xue-fei,Luo Shao-hua,Chen Huan-huan,Mu Wen-ning

Phenol, as a representative organic pollutant in industrial wastewater, poses a critical challenge for environmental remediation. In this study, titanium-doped iron tailings-based heterogeneous catalysts (Ti/PCG) with enhanced electron transfer kinetics were synthesized via a high-temperature sintering method and evaluated for their photo-Fenton degradation efficiency toward phenol. The Ti/PCG catalysts were systematically characterized via SEM, BET, XPS, and photoelectrochemical analyses to elucidate their structural and electronic properties. Results indicated that 15% TiO 2 -doped Ti/PCG exhibited optimal properties, including the largest specific surface area, well-developed hierarchical pore structures, superior charge transfer capacity, and high carrier separation efficiency. Under optimized conditions (pH = 2.75, 0.2 ml H 2 O 2 (30 wt%), and 1 h light irradiation), the 15% Ti/PCG achieved 80.68% removal of phenol (initial concentration: 100 ppm). Mott-Schottky and VB-XPS analyses confirmed the n-type semiconductor behavior of the 15% Ti/PCG, with a conduction band (E CB ) at − 0.455 eV and a valence band (E VB ) at 2.09 eV, enabling the proposal of a plausible photo-Fenton degradation mechanism. Radical trapping experiments further demonstrated that hydroxyl radicals (·OH) and superoxide radicals (·O 2 − ) dominated the phenol degradation process. This work provides an optimized photo-Fenton strategy for phenol-laden wastewater treatment with 80.68% degradation efficiency, while demonstrating the potential of industrial solid wastes as sustainable catalysts in environmental remediation.

Z-Scheme CdS/Fe-MOF Heterojunctions Enabling Efficient Photo-Fenton Reactions through In Situ H2O2 Production

Lu Zhang,Jianhao Qiu,Zongpeng Zou,Shengwei Tang,Wenxiang Tang

This work demonstrates the rational design of a Z-scheme CdS/Fe-MOF heterojunction for photo-Fenton processes utilizing in situ generated H2O2 under visible light. The photocatalysts were synthesized by depositing CdS nanoparticles onto MIL-53(Fe), optimizing interfacial charge transfer and light absorption, and ensuring effective spatial segregation of photogenerated carriers, thereby maintaining robust redox potentials. The modified CdS/Fe-MOF exhibited exceptional catalytic performance, achieving 92% degradation of 40 mg·L–1 tetracycline within 15 min, surpassing pure CdS (43%) and MIL-53(Fe) (30%) by factors of 2.3 and 3.3, respectively. Mechanistic studies identified on-site H2O2 generation through two-step oxygen reduction (236 μmol·L–1) and its subsequent activation by Fe3+/Fe2+ cycling to produce ·OH as key pathways, with h+, ·O2–, 1O2, and ·OH collectively driving pollutant degradation. The prepared photocatalysts demonstrated remarkable stability (>90% efficiency after five cycles) and structural integrity, attributed to the robust heterojunction interface. This study provides deep insight into designing Z-scheme photo-Fenton catalysts and advancing sustainable wastewater treatment.

Specific Sn–O–Fe Active Sites from Atomically Sn-Doping Porous Fe2O3 for Ultrasensitive NO2 Detection

Zhong Yihong,Yuan Guotao,Bao Dequan,Tao Yi,Gao Zhenqiu,Zhao Wei,Li Shuo,Yang Yuting,Zhang Pingping,Zhang Hao,Sun Xuhui

The heteroatom atomically doping strategy was reported to construct highly efficient sites on metal oxides for the detection of low-concentration gas. The atomically dispersed Sn atoms were intentionally incorporated into the Fe 2 O 3 lattice during the oxidative annealing of Fe-based metal organic framework, leading to specific Sn–O–Fe sites, porous structures, and abundant oxygen vacancies. The optimized Sn-Fe 2 O 3 exhibited exceptional sensing performance for NO 2 detection: ultra-high sensitivity ( Rg / Ra =2646.6 to 1 ppm NO 2 ), ultra-low limit of detection (10 ppb), and high selectivity.

Reducing agents enhanced Fenton-like oxidation (Fe(III)/Peroxydisulfate): Substrate specific reactivity of reactive oxygen species

Shuang Meng,Peng Zhou,Yiming Sun,Peng Zhang,Chenying Zhou,Zhaokun Xiong,Heng Zhang,Juan Liang,Bo Lai

Reduction of Fe(III) is the rate-limiting step of iron induced Fenton-like systems, such as the iron/peroxydisulfate system, reducing agents (RAs) were frequently employed as electron donors to directly reduce Fe(III) to further promote the formation of reactive oxygen species (ROS), mainly including hydroxyl radical ( • OH), sulfate radical (SO 4 •− ), and ferryl ion (Fe(IV)). However, the intrinsic distinctions among these ROS cause the substrate specific reactivity towards oxidation of diverse organic contaminants. In this study, various RAs (representative solid amorphous boron (A-Boron) and dissolved hydroxylamine (HA)) were added to enhance the Fe(III)/PDS system for investigating the substrate specific reactivity of ROS. It is demonstrated that RAs remarkably boost the Fe(III)/Fe(II) cycles to produce • OH, SO 4 •− , and Fe(IV) in the RAs/Fe(III)/PDS systems, based on the results of EPR analysis, quenching tests, and chemical probe analysis. Furthermore, the different yields of methyl phenyl sulfone (PMSO 2 ) indicate that the distribution of multiple oxidizing species changed with various factors (i.e., type and dosage of RAs added, solution pH, Fe(III) and PDS dosage). This work provides the possibility for the adjustment of oxidation selectivity of RAs/Fe(III)/PDS systems by regulating contribution of radicals and non-radical for oxidizing organic contaminants due to the substrate specific reactivity of • OH, SO 4 •− , and Fe(IV), moreover, the comparison of homogeneous and heterogeneous RAs provides assistance in the application of RAs for environmental remediation.

Enhanced Bactericidal Effect of Calcinated Mg–Fe Layered Double Hydroxide Films Driven by the Fenton Reaction

Lei Chen,Yijia Yin,Linjia Jian,Xianglong Han,Xuefeng Zhao,Donghui Wang

Osteogenic and antibacterial abilities are the permanent pursuit of titanium (Ti)-based orthopedic implants. However, it is difficult to strike the right balance between these two properties. It has been proved that an appropriate alkaline microenvironment formed by Ti modified by magnesium–aluminum layered double hydroxides (Mg–Al LDHs) could achieve the selective killing of bacteria and promote osteogenesis. However, the existence of Al induces biosafety concerns. In this study, iron (Fe), an essential trace element in the human body, was used to substitute Al, and a calcinated Mg–Fe LDH film was constructed on Ti. The results showed that a proper local alkaline environment created by the constructed film could enhance the antibacterial and osteogenic properties of the material. In addition, the introduction of Fe promoted the Fenton reaction and could produce reactive oxygen species in the infection environment, which might further strengthen the in vivo bactericidal effect.Keywords:antibacterial;osteogenic;Mg–Fe layered double hydroxides;alkaline microenvironment;Fenton reaction

Z-scheme heterojunction WO3/BiOBr supported-single Fe atom for ciprofloxacin degradation via visible-light photocatalysis

Qinqin Yu,Youzhi Dai,Yulin Ling,Qian Wu,Zhu Zhang,Bo Feng

Single-atom catalysts have drawn tremendous attention on account of their high activity, selectivity and stability. Z-scheme heterojunctions can effectively improve the utilization of optical energy due to the enhanced separation of photogenerated electrons and holes. In this work, several catalysts associated with single-atom Fe (FeSA) loaded on Z-scheme heterojunction WO 3 /BiOBr were prepared; their structure, morphology and photoelectric properties were analyzed; their photocatalytic degradation performance of Ciprofloxacin (CIP) was investigated; and the effects of initial pH, initial CIP concentration, catalyst dosage, light intensity , inorganic anions and humic acid on CIP removal rate were examined. Relevant results showed that the percentage of CIP removal by FeSA/WO 3 /BiOBr could reach 98.5% (120 min); the optimal conditions were pH= 9, [CIP] 0 = 10 mg/L, [FeSA] 0 = 0.8 g/L and I light = 500 W (100% degradation rate within 30 min);·O 2 - and h + were the key active species. Results of the cyclic experiments suggested good stability of the catalyst. Furthermore, the mechanism of CIP photocatalytic degradation was proposed to be a synergistic mechanism of Z-scheme heterojunction migration and valence cycling between single-atom Fe 2+ and Fe 3+ . Finally, the products and pathways of CIP degradation were analyzed.

Temperature-Induced Structural Phase Transitions in Nano-Fe-Modified Sustainable Biochar for Efficient Sb(III) Adsorption