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RISS 인기검색어
- 검색키워드
- 저자 : Moussa Abbas (검색결과 3 건)
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Moussa Abbas,Mohamed Trari 한국섬유공학회 2020 Fibers and polymers Vol.21 No.4
Quantitative adsorption kinetic and equilibrium parameters for methylene blue (MB) used in the textile industryfrom aqueous solutions were reported in this study using pHPZC and UV-visible absorption spectroscopy. The effects ofadsorbent dosage (1-10 g/l), agitation speed (100-1200 rpm), particule size (63 μm to 2 mm), initial dye concentration (4-15 mg/l), contact time, pH (2-14), and temperature (298-338 K) were determined to find the optimal conditions foradsorption. The FTIR spectroscopy is used to get information on interactions between the adsorbent and MB. The mechanismof adsorption of MB dyeing onto Apricot Stone Activated Carbon (ASAC) was investigated using the pseudo first-order,pseudo second-order kinetic, Elovich and intraparticles diffusion models. The adsorption isotherms of MB onto ASAC aredetermined and correlated with common isotherm equations. The smaller RMSE value obtained for the Langmuir modelindicates the better curve-fitting and the monolayer adsorption capacity of MB is found to be 46.03 mg/g at 25 oC and88.50 mg/g at 70 oC and pH 10. The evaluation of thermodynamics parameters such as the negative free energy ΔGo(+2.70025 to -1.76666 kJ/mol) and positive enthalpy change ΔHo (28.87613 kJ/mol) indicated a spontaneous andendothermic nature of the reaction with chemisorption process. This study in tiny batch gave rise to encouraging results, andwe wish to achieve the adsorption tests in column mode under the real conditions applicable to the treatment of industrialeffluents. The present investigation showed that ASAC is potentially a useful adsorbent for the heavy metals and dyes.
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Moussa Abbas,Mohamed Trari 한국섬유공학회 2023 Fibers and polymers Vol.24 No.9
Pollution of water caused by different contaminants is a serious threat and a challenging problem. Various toxins are discharged into water bodies from several industries and other sources thus causing a large pollution. Because of their hazardous nature, excessive usage of textile dyes is a major environmental concern. Therefore, the aim of this study was to evaluate the adsorption of Reactive Blue 49 (RB), a recalcitrant dye onto untreated Peanut Schell (UPS) from aqueous solutions in a batch system. However, the effects of operational factors like initial pH (2-12), contact time (0-60 min), adsorbent dose (1-10 g/L), RB concentrations (10-40 mg/L), and temperature (298-318 K) were investigated on the adsorption efficiency of UPS. The latter was characterized by BET surface area (Sarea=30.05 m2/g), the point of zero charge (pHpzc=6), FT-IR spectroscopy, and scanning electron microscopy (SEM). Batch studies were conducted to determine the optimal parameters required to reach the adsorption equilibrium. The maximum adsorption capacity of UPS for RB at 298 K was found to be (qmax=30.30 mg/g). The adsorption kinetic data were analyzed using the pseudo-first-order and pseudo-second-order models. It was established that the adsorption process obeys the pseudo-second-order kinetic model with a determination coefficient (R2) equal to 0.999. The thermodynamics parameters such as the standard free energy ΔG° (0.999, -4.45, and -9.82 kJ/mol), negative enthalpy ΔH° (-172.2 kJ/mol), and change of entropy (-0.544 J/mol/K) indicated a spontaneous and exothermic physisorption.
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Moussa Abbas 한국섬유공학회 2023 Fibers and polymers Vol.24 No.2
The adsorption is widely used to remove certain classes of pollutants from water, especially those that are hardly biodegradable and dyes represent one of these problematic groups. The removal of bromothymol blue (BTB) from wastewater using TiO2 was studied in batch system. The adsorbent TiO2has a specific surface area of 400 m2/g, a mean crystallites sizes (5–10 nm), and pHpzc equal to 6.5. TiO2 is stable over the whole pH range and constitutes a good compromise between efficiency and stability (in both acidic and basic media), therefore, the use of other additives is not necessary. Its non-toxicity and low energy required for its activation (E ~ 3 eV) as well as its low cost for most of the applications envisaged make it advantageous. Theinfluence of effective variables such as solution pH (1–10), contact time (0–60 min), initial BTB concentration (5–40 mg/l),adsorbent dose of TiO2 (0.2–2 g/l), and temperature (20–60 °C) on the adsorption efficiency was examined, while the BTBcontent was determined by UV–Vis spectrophotometry. The optimal pH, adsorbent dose, and contact time for the efficientremoval were found to be 10, 0.2 g/l, and 30 min, respectively, and the adsorbent was characterized by the BET analysis andpoint of zero charge (pHpzc). Among the different kinetic models, the experimental data of the BTB removal are well fittedwith the pseudo-first-order kinetic model with a high determination coefficient. The evaluation of the fitness of equilibrium data by various conventional isotherm models, based on the R2 value as criterion, show the successful applicability of theLangmuir model for the interpretation of experimental data with a maximum adsorption capacity (qmax) of 27.02 mg/g at20 °C and R2 of 0.997. The adsorption isotherms at different temperatures have been used for the determination of the freeenergy (ΔGo = 2.1808 to—1.0981 kJ/mol), enthalpy (ΔHo = 20.74 kJ/mol), and entropy (ΔSo = 65.58 J/mol/K) indicate thatthe overall adsorption is spontaneous and endothermic in nature.
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