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RISS 인기검색어
- 검색키워드
- 저자 : Michalis Konsolakis (검색결과 2 건)
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Mohsen Lashgari,Mahchehreh Sabeti-Khabbazmoayed,Michalis Konsolakis 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.122 No.-
A straightforward strategy to resolve the H2S problem is its neutralization in alkaline media, followed byelectrolysis of the obtained solution upon suitable electrodes. Herein, we report for the first time that viagalvanostatic electrolysis of the resulting alkaline sulfide medium over copper electrodes, this harmfulpollutant could be safely as well as cost-effectively transformed to hydrogen clean fuel and a valueaddedeco-friendly semiconducting material. The strong interaction of copper with bisulfide (the dominantspecies of the medium at pH 11) resulted in a significant decrease in the system impedance, accompaniedby less electricity consumption during the process. A nano/micro-structured, mesoporousmorphology was observed for the anodic product (surface area: 11.4m2/g). Photoelectrochemical and diffusereflectance as well as XRD, EDX, XPS and photoluminescence investigations revealed that the materialsynthesized upon the anode surface was a narrow bandgap (Eg ¼ 1:63eV) p-type semiconductor. Inaddition to the economic perspective of the proposed electrolysis process (3 6 USD/kgH2), the underlyingmechanism of simultaneous production of semiconductor (CuS) and H2 was thoroughly discussed.
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Alireza Khataee,Dimitrios Kalderis,Parisa Yekan Motlagh,Vassilis Binas,Sofia Stefa,Michalis Konsolakis 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
Herein, novel Cu2O–CuO/HTC composites were prepared by hydrothermal precipitation employing ascarrier sawdust hydrochar carbonized at 200 C for 2, 6, and 12 h. The composites were used for theeffective sonocatalytic degradation of three dyes (Acid Blue 92 (AB 92), Acid Red 14 (AR 14) and AcidOrange 7 (AO 7)) with different molecular structure. To gain insight into the functional groups, crystallinestructure, elemental composition and optical characteristics of the Cu2O–CuO/HTC composites, FT-IR,XRD, EDX and UV–vis analyses were carried out. Also, the surface morphology and area of the Cu2O–CuO/HTC composites were investigated by SEM and BET analysis. The effect of different parameters, such asdye concentration, solution pH, and catalyst dosage on the sonodegradation process was examined. Among the as-prepared composites, the Cu2O–CuO/HTC-2 h sample exhibited the best performance,offering a degradation efficiency of 85.43% after 90 min. GC-MS analysis was in addition employed todetermine potential intermediates. To assess the mineralization of dye solution under optimumconditions, COD analysis was performed implying 77.77% removal efficiency. Additionally, the reusabilityand stability of the as-prepared composites were verified. The leaching copper concentration in theaqueous phase was measured within four consecutive runs.
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