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- 저자 : Giancarlo Cravotto (검색결과 2 건)
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Microwave-assisted modification of activated carbon with ammonia for efficient pyrene adsorption
Xinyu Ge,Zhansheng Wu,Zhilin Wu,Yujun Yan,Giancarlo Cravotto,Bang-Ce Ye 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.39 No.-
With the aim to enhance the adsorption properties of polycyclic aromatic hydrocarbons (PAHs) fromaqueous solutions, coal-based activated carbon (CAC) was modified with three different protocols: (i)ammonia treatment (A-CAC), (ii) microwave radiation (M-CAC) (iii) and combined microwave radiationin the presence of ammonia (MA-CAC). The original CAC and all the modified samples were characterizedby SEM, nitrogen adsorption–desorption, Boehm method, point of zero charge, FTIR and XPS. The surfacearea increased from 764.96 to 1293.78 m2/g for CAC and MA-CAC, whereas the total oxygen-containinggroups decreased from 1.57 to 0.25 mmol/g. The pyrene adsorption capacity of all the modified sampleswas higher than CAC and the adsorption process for pyrene to the equilibrium needed only 40 min. Adsorption of pyrene on CAC and MA-CAC varies from the monolayer to multilayer process. The filmdiffusion could control the adsorption rate of pyrene onto carbons. The adsorption capacity of the CACand modified samples had a good positive correlation with surface area, carboxyl groups, and lactonesgroups. The modified samples, especially MA-CAC, showed an enhanced adsorption of pyrene openingthe way to a more general application as efficient adsorbent for PAHs contaminant.
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Xuemin Xiao,Fei Tian,Yujun Yan,Zhilin Wu,Zhansheng Wu,Giancarlo Cravotto 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.6
Coal-based activated carbon (CAC) was prepared from coal produced in Xinjiang of China by microwave activation. CAC was characterized and used as an adsorbent for phenanthrene adsorption. The effects of temperature, adsorption time, CAC amount, initial concentration and pH value of solution on phenanthrene adsorption were studied. The adsorption rate of phenanthrene onto CAC was obtained nearly 100% with initial concentration of 100 mg/L and CAC dosage of 0.3 g at 25 oC. Phenanthrene adsorption was well described with the Langmuir isotherm. The pseudosecond- order model was found to more effectively explain the adsorption kinetics of phenanthrene. The lower temperature was favorable to the adsorption rate and equilibrium adsorption capacity of phenanthrene onto CAC. The thermodynamic parameters ΔHθ, ΔSθ and ΔGθ computed for phenanthrene adsorption onto CAC demonstrate the process was spontaneous, radiative, and entropically driven. Thus, CAC prepared by microwave activation could be effective for removing phenanthrene.
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