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- 저자 : Dimitrios Kalderis (검색결과 3 건)
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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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A complementary analysis of the porous structure of biochars obtained from biomass
Kwiatkowski Mirosław,Kalderis Dimitrios 한국탄소학회 2020 Carbon Letters Vol.30 No.3
This paper presents the results of the analysis of the porous structure of biochars produced from biomass, namely eucalyptus, wood chips, pruning waste and rice husk. The structural analysis was carried out using the BET, the t-plot, the NLDFT and the LBET methods, which yielded not only complementary information on the adsorptive properties of obtained biochars from these materials, but also information on the usefulness of the structural analysis methods in question for the research into an effect of the technology of carbonaceous adsorbent preparation.
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Divine Damertey Sewu,이대성,우승한,Dimitrios Kalderis 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.3
Sewage sludge biochar (SBC) was used as adsorbent to study the adsorption behavior of triarylmethane dyes, malachite green (MG; diaminotriphenylmethane), and crystal violet (CV; triaminotriphenylmethane). SBC exhibited high content (g/kg) of Al (65.8), P (64.6), Ca (57.3), and Fe (44.6). The Langmuir model showed that the affinity of MG for the surface of SBC was 22.6-times that of CV’s (KL=0.0053 l/mg); maximum Langmuir monolayer adsorption capacity of 69.5 mg/g for MG and 49.0 mg/g for CV. Similar functional groups and adsorption mechanisms like hydrogen bonding, π-π interaction, electrostatic interactions, and ion exchanges governed both MG and CV adsorption onto SBC. Both physisorption and chemisorption were involved in both dyes’ adsorption (Redlich-Peterson model: R2 > 0.900) Leachability tests showed a dependency of leached metallic ions on the type of dye employed, where ion exchange was dominated by P, Al, Ca, K for MG, and Na, K, Ca for CV. Interestingly, although minimal, the standalone contribution of biochar-free ions on MG and CV decolorization was, respectively, 13% and 7.7% (Fe), 6.7% and 2.3% (K), 2.9% and 0% (Ca), and 0% and 0.8% (Mg), which showed that some adsorption-unrelated mechanism may have also contributed to decolorization of CV and MG.
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