CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Bingyang Liu,Yu Wang,Xue Hao,Xuetao Liang,Qi Yang
In this work, a carbon-based catalyst Fe/Co@C with MOF as a self-sacrificing template was prepared by high-temperature roasting of FeCo-MIL101, which was applied to activate PMS for the degradation of chlorotriazine herbicides (ATZ and SIM) showing excellent performance. Characterization analysis revealed that Fe/Co@C possesses a certain graphene structure and has a saturation magnetization rate of 0.87 emu/g, which can be separated from the solution easily and quickly. The degradation of ATZ and SIM was enhanced by introducing chloride ions into the system, and 100 mmol/L Cl - could lead to the complete removal of ATZ and SIM in 6 min, while improving the interfacial electron transfer of Fe/Co@C/PMS. In combination with quenching experiments, ESR test results and DFT calculations, two important roles of chlorine radicals in the reaction are proposed: (1) direct electron transfer and (2) indirect promotion of 1 O 2 generation through the production of HOCl. In addition, the testing of the influencing factors of the catalyst in the system (catalyst dosing, PMS dosing, pH, temperature), the testing of coexisting anions in the aqueous matrix, and the reusability all showed satisfactory performance. Finally, the degradation mechanisms of ATZ and SIM were proposed in combination with GC–MS determination of contaminant intermediates and analysis of their toxicity.
研究领域:
环境科学
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催化
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水处理
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化学工程
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Kun Liu,Yujing Ling,Xianglong Guan,Ke Hu,Angli Zhang,Kaiqi Liu,Haoyi Li,Guangnian Xu,Xu-Cheng Fu
The commercialization of magnesia-air batteries (Mg-air) necessitates the development of highly efficient, cost-effective, and durable electrocatalysts for oxygen reduction reaction (ORR), replacing expensive and unstable precious metal electrocatalysts. A hard template-assisted synthesis of FeCo nanoparticles immobilized on N-doped porous carbon (Fe-Co-C-N) for the ORR is reported. The half-wave potential of Fe-Co-C-N for ORR (E1/2=0.88 V vs. RHE) is elevated by 40 mV compared to that of 20 wt% Pt/C (E1/2=0.84 vs. RHE). The catalyst exhibits exceptional catalytic performance and remarkable stability. The discharge voltage of the Mg-air battery, utilizing Fe-Co-C-N as the cathode catalyst (1.29 V), surpasses that of the battery employing 20 wt% Pt/C as the cathode catalyst (1.28 V). The Mg-air battery with Fe-Co-C-N as the cathode catalyst exhibited excellent discharge stability and maintained a stable discharge for over 200 hours. The present study offers valuable insights into the structural design and regulatory mechanisms governing the performance of M-N-C catalysts in Mg-air batteries.
研究领域:
材料科学
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电化学
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能源存储
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产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 9
·2078
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IF 4.2
Yu Cao,Zeming Dai,Xuan Zhou,Yuting Lin,Jianhua Hou
The dyes in printing and dyeing wastewater are harmful to the human body and the environment. It is essential to develop practical and effective adsorbents to deal with them. In this study, an Fe-doped, ZIF-67 derived Fe/Co/C composite material with strong magnetism was successfully synthesized. The effects of pH, initial concentration, and adsorption time on the properties of the adsorbent were investigated. To further improve the removal efficiency and enhance the practicality, potassium peroxymonosulfate (PMS) was added to the system due to its Fenton-like effect. Then, an Fe/Co/C composite was used with PMS to remove Congo red (CR) with a 98% removal of 250 mg·L−1. Moreover, for its high saturation magnetization of 85.4 emu·g−1, the Fe/Co/C composite can be easily recovered by applying a magnetic field, solving the problem that powdery functional materials are difficult to recover and, thus, avoiding secondary pollution. Furthermore, since the composite material was doped before carbonization, this synthetic strategy is flexible and the required metal elements can be added at will to achieve different purposes. This study demonstrates that this Fe-doped, ZIF-67 derived magnetic material has potential application prospects for dye adsorption.
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 THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 8
·087501
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IF 4.316
Shiying Zhou,Peng Zhao,Jilin Zheng,Sha Chen,Mei Yang,Danqun Huo,Changjun Hou
Flexible electrodes play an increasingly important role in the development of portable and wearable electronics. Herein, a novel flexible and self-supporting electrode supported on active electrocatalyst (Au/Fe–Co@C–Nx/GO/CC) has been prepared for in situ detection of extracellular H2O2. The Fe, N co-doping of Fe–Co@C–Nx with abundant active sites promotes electron transfer efficiency, and Fe–Co@C–Nx nano-arrays with a unique spatial structure are beneficial for the deposition of Au nanoparticles (AuNPs). Graphene oxide (GO) serves as a chemical bridge to ensure that the nanomaterials grow more uniformly and firmly on the carbon cloth. Meanwhile, the flexible carbon cloth possesses stable mechanical and electrochemical properties. Based on these unique superiorities, this flexible electrode exhibits excellent sensing performance toward H2O2 with high selectivity and sensitivity, low LOD (0.56 μM), and wide linear range (from 5 to 21195 μM). Most importantly, the prepared electrode can adhere to cells for in situ and sensitive determination of H2O2 released from cells. Compared to detecting H2O2 in cell suspensions, in situ detection can capture the signal molecules more sensitively and effectively, avoiding the diffusion of H2O2 from the solution to the electrode surface. This flexible electrode has great potential in development of molecular detection and portable electronics.
研究领域:
材料科学
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电化学
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生物传感器
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可穿戴电子
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Shengnan Li,Jiwei Jiang,Shih-Hsin Ho,Fengxiang Li,Wenlu Zeng
Microbial fuel cells (MFCs) systems are up-and-coming technologies for renewable energy production and wastewater treatment simultaneously. However, the inactive oxygen reduction reaction (ORR) on the cathode markedly limits the functioning of MFCs. Therefore, the cathodic catalyst is one of the crucial components in MFCs, this paper presents the removal of the antibiotic sulfamethoxazole (SMX) from water using single-chamber MFCs with Fe-Co-C/N as electrocatalysis. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) were conducted to illustrate the structure and elemental composition of Fe-Co-C/N. The results obtained by the rotating disk electrode (RDE) method showed an extraordinary electrocatalytic activity of Fe-Co-C/N towards ORR in O 2 -saturated 0.1 M KOH. Furthermore, the degradation of SMX by MFCs that applied modified electrodes was also studied. The results demonstrated that using Fe-Co-C/N as air–cathode catalysts exhibited the degradation efficiency of 61.64% towards 6 mg/L SMX with 48 h. In addition, cyclic voltammetry (CV) analysis showed that the peak current of the biofilm in the PBS solution (without adding SMX) was significantly higher than that of the solution with SMX addition at 6, 18, and 30 mg/L. Moreover, MFC performance was also evaluated by measuring electrochemical impedance spectroscopy (EIS), power generation, and polarization curves. Last but not least, the high-throughput sequencing-based metagenomic technique was used to explore the microbial community diversity, functional genes in MFCs, and fate of ARGs. SMX addition raised the abundances of sul1 and sul2 as resistance genes, which enhanced microbial resistance, the coping capability of SMX toxicity, and the adjustment of the damage from SMX. The obtained results suggest that Fe-Co-C/N is a feasible catalyst for MFC cathodes owing to its satisfactory performance in terms of SMX wastewater treatment and power production.
研究领域:
环境科学
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电化学
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废水处理
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微生物学
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催化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
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