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  • Valorization of waste plastics to a novel metal-organic framework derived cobalt/carbon nanocatalyst as peroxymonosulfate activator for antibiotics degradation
    • Chongqing Wang
    • Xiuxiu Zhang
    • Luyao Wang
    • Gonggang Liu
    • Grzegorz Boczkaj
    2025 JOURNAL OF CLEANER PRODUCTION

    Metal-organic frameworks (MOFs), with excellent structural properties, exhibit unique advantages as promising catalysts in the degradation of emerging organic contaminants (EOCs) by PS-AOPs. Herein, Co-MOF-71 was prepared by hydrothermal method using terephthalic acid (TPA) obtained from the hydrolysis of waste PET plastics as an organic ligand, and the derived cobalt/carbon composite (PETC) was prepared by carbonizing Co-MOF-71 under N2 atmosphere. Characterizations revealed that PETC800 carbonized at 800 °C possessed a loose and porous layered morphology with a surface area of 148 cm2/g, and had a porous structure rich in active sites that are effective in peroxymonosulfate (PMS) activation and tetracycline (TC) degradation. Degradation experiments revealed that the maximum degradation rate of TC by PETC800 could reach 90.94% within 20 min, with a maximum rate constant of 0.2700 min−1 and activation energy of 19.50 kJ/mol, which was lower than that of previous reports. Additional studies confirmed high effectiveness also towards other pharmaceuticals degradation such as metronidazole, levofloxacin and doxorubicin. More importantly, PETC800 could degrade TC efficiently in a broad pH region (3.0–9.0). The degradation performance of TC could be 72.18% after four cycles, demonstrating good reusability. Both radical (•OH, SO4•−, and O2•−) and nonradical pathways (singlet oxygen (1O2) and electron transfer) contributed to the TC degradation process, with the non-radical pathway dominating. LC-MS and toxicity analyses have postulated the degradation of TC into intermediates with lower levels of toxicity. The preparation of MOFs-derived catalysts from waste plastics allows resourceful utilization of waste plastics as well as enhances the catalytic performance of MOFs-derived cobalt/carbon-based catalysis for efficient degradation of emerging organic contaminants.

  • View Quality Assessments: A Pilot Study of Field Methods
    • Barbara Matusiak
    • Mandana Sarey Khanie
    • Claudia Moscoso
    • Anna María Pálsdóttir
    • Siegrun Appelt
    • Christina Hemauer
    • Klaus Martiny
    • Kamilla Woznicka Miskowiak
    • Ida Astrid Lindegaard
    • Alexander Tobias Ysbæk-Nielsen
    • Carlo Volf
    • Natalia Sokół
    2025 Pełny tekst LEUKOS

    This paper describes findings from a workshop during which participants evaluated a series of windowviews. An explorative approach was applied to identify issues and testing methods useful in daylightresearch. The participants visited nine rooms with views of varied content, complexity, and viewingdistance under the overcast sky. Participants used surveys with quantitative and qualitative questions,hand drawings, illuminance measurements, and photography to appraise the view quality.Subsequently, daylight simulations and neurocognitive tests have been carried out in two rooms with“bad” and “good” views. Multi-directional views were valued more than narrow or single-directionalviews. The cognitive testing showed numerical differences in several measures and a significant correla-tion between the difference scores for sadness and the difference scores for Trail Making Test-B acrosstwo rooms. The study identified that buildings of historical value, a presence of greenery, coloredbuilding facades, or a presence of people (content) contribute to a positive assessment of the view but are not included in the assessment criteria.

  • Vitamin B9 as a new eco-friendly corrosion inhibitor for copper in 3.5% NaCl solution
    • Hubert Kwiatkowski
    • Stefan Krakowiak
    • Łukasz Gaweł
    2025 Pełny tekst JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY

    Folic acid salt (sodium folate) was studied as an eco-friendly and non-toxic copper corrosion inhibitor in 3.5% NaCl solution. Electrochemical impedance spectroscopy, polarization resistance and weight-loss measurements show that the inhibitor efficiency increases with concentration (the highest value- approx. 96% was reported for the solution containing 16 mM sodium folate after 24 h). EIS data and Tafel plots indicate that sodium folate is a barrier, mixed-type (with predominant cathodic character) inhibitor. Inhibitor efficiency decreases with temperature, which suggests that adsorption has physical character rather than chemical one - adsorption free energy calculated using the Langmuir model is consistent with this statement. Activation energy determined from the Arrhenius plot increases as a result of inhibitor presence. Efficiency of the inhibitor increases systematically during the first 12 hours of immersion. Potential chemical changes in sodium folate solution were investigated using UV-VIS spectroscopy. Furthermore, copper surface after immersion in the presence and absence of inhibitor was characterized with scanning electron microscopy, energy-dispersive X-Ray spectroscopy and microscopic photographs.

  • Voltage Control of a Stand-Alone Multiphase Doubly Fed Induction Generator
    • Krzysztof Blecharz
    • Marcin Morawiec
    • Roland Ryndzionek
    • Michał Michna
    2025 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS

    This article presents a multiphase doubly fed induction generator (MDFIG) with a dedicated and unique control algorithm in a stand-alone wind energy conversion system. The algorithm has been developed and elaborated in the case of different emergency modes. Compared with the traditional double-fed induction generator, the MDFIG has increased reliability, reduced current level per phase, and low rotor harmonic currents. The control system is based on a classical mathematical model and the stator field-oriented control method. However, especially for the wind turbine system, the control system has been extended for dedicated five-phase operation and additional scenarios have been added. First, the dynamic states of the generator operation under normal operating conditions with voltage variation and load were simulated and compared with laboratory tests. Second, the fault-tolerance results of rotor phase failures with different states and loads were presented. This performance is validated in the laboratory with a 4 kW prototype MDFIG. The method presented in this article is simple, robust, and cost effective with MDFIG and has significantly improved the reliability of the power generation system.