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RISS 인기검색어
- 검색키워드
- 저자 : Abdelmouleh Makki (검색결과 3 건)
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Fatma. Njeh,Morched. Hamza,Ines. Bouaziz,Ridha. Abdelhedi,Makki. Abdelmouleh 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.3
This research work is based on the isolation of cellulosic fibers from Tunisian olive sawdust (TOS) by alkaline treatment using a solution of NaOH at different concentrations: 5% w/v (TOS5) and 20% w/v (TOS20). The valorization of these cellulosic supports was assessed by the adsorption ability of methylene blue (MB), chosen as a model compound of organic dyes. SEM and FTIR analyses have shown that alkaline treatment produces a delignification of TOS and an elimination of hemicellulose. A transformation of cellulose I to cellulose II was shown by XRD following the decrease of the crystallinity indices passing from TOS5 (~37%) to TOS20 (~30%). The spectroscopic study confirmed that the intermolecular and intramolecular hydrogen bonds have a primordial role in the forms and the structural stability of the cellulosic substrates. Thereby, the deconvolution of OH stretching vibration band confirmed the transition from cellulose I to cellulose II by the occurrence of a new band at 3,080 cm1 for TOS20. The increase of iodine adsorption values (ISV) from 40 mg·g1 for TOS5 to 65mg·g1 for TOS20 is behind the improvement of the accessibility of cellulosic support with alkaline treatment of TOS. The adsorption of MB onto the surface of cellulosic substrates in aqueous mixtures was studied quantitatively. The corresponding isotherms in basic medium have shown the formation of a monolayer following the Langmuir model characterized by 14mg·g1, 52 mg·g1 and 76 mg·g1 onto the TOS, TOS5 and TOS20, respectively. The desorption efficiency of MB in acid medium increased with 37%, 57% and 71% for TOS, TOS5 and TOS20, respectively. Hence, the extracted cellulosic fibers are likely to be a promising adsorbent for the removal of organic dye from aqueous solutions.
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Bio-based composite as phase change material including spent coffee grounds and beeswax paraffin
Souissi Moez,Trigui Abdelwaheb,Jedidi Ilyes,Loukil Mohamed Sahbi,Abdelmouleh Makki 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.9
New types of bio-composite phase change materials (BCPCM) with improved thermal properties were made from spent ground coffee powder (C), beeswax (W) and low density polyethylene (LDPE). Beeswax is a relatively accessible phase change material of organic origin, with a significantly lower unit price compared to conventional phase change materials (PCM). The observations by SEM and FTIR spectroscopy showed that the BCPCMs were physically combined. Through these techniques, it was discovered that ground coffee was effectively impregnated with natural wax and LDPE. According to the thermal gravimetric analysis (TGA), the thermal stability of BCPCM was improved, due to the use of waste coffee grounds, in the working temperature range. The biocomposite possesses excellent performance as characterized by 136.9 J/g (W70C10PE20)>, 127.31 J/g (W70C20PE10)>, 126.95 J/g (W70C30)>, 121.08 J/g (W70PE30) of latent heat storage and tends to decrease the supercooling degree as compared with pure beeswax during melting/solidification process. By adding LDPE to the PCM, the melting time is reduced, demonstrating an improvement in thermal energy storage (TES) reaction time to the demand. The experimental results showed that the fraction of oils (12%) in spent ground coffee powder can participate in the improvement of the thermal properties of BCPMC. The use of biocompatible PCM by-products is suitable for applications in the field of heat storage because it is affordable and environmentally beneficial.
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Sabrine Zghal,Ilyes Jedidi,Marc Cretin,Sophie Cerneaux,Didier Cot,Serge Lagerge,Stefano Deabate,Makki Abdelmouleh 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.8
The highest total organic carbon (TOC) and color removal efficiency of Acid Orange 7 (0.1 mM initialconcentration) on graphite carbon/carbon nanotubes electrodes (KS44/CNT) reached more than 98% in three hours ofElectro-Fenton (EF) treatment under optimal conditions (pH=3 and I=20 mA), compared to carbon graphite electrodedeveloped without carbon nanotubes (KS44-0). The apparent kinetic constants of degradation were 0.17 and0.12 min1 for the KS44-(20)/CNT and KS44-0, respectively. The long-term stability and system durability were attributedto the graphite carbon/CNT electrodes due to continuous operating treatment that allowed processing efficiency andreusability without any decrease of the catalytic activity in time after five cycles of use. Regardless of the medium, superiordecolorization and TOC removal efficiency were obtained for electrodes (KS44-(20)/CNT) containing 20 wt% offerrocene powder as catalyst for CNTs’ growth and iron nanoparticle establishment. Furthermore, the presence ofCNTs and iron particles as precursors enhanced drastically the electrochemical and physical properties of the electrodesynthesized in a one-step process. The results confirmed that carbon electrodes behave as multifunctional materials actingboth as adsorbent and active cathode in the electro-Fenton process for the destruction and total mineralization ofAcid Orange 7 (AO7) as a model for organic contaminated wastewater.
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