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Grażyna Gryglewicz - One of the best experts on this subject based on the ideXlab platform.

  • Influence of pore size distribution on the Adsorption of Phenol on PET-based activated carbons.
    Journal of colloid and interface science, 2016
    Co-Authors: Ewa Lorenc-grabowska, Maria A. Diez, Grażyna Gryglewicz
    Abstract:

    The role of pore size distribution in the Adsorption of Phenol in aqueous solutions on polyethylene terephthalate (PET)-based activated carbons (ACs) has been analyzed. The ACs were prepared from PET and mixtures of PET with coal-tar pitch (CTP) by means of carbonization and subsequent steam and carbon dioxide activation at 850 and 950 °C, respectively. The resultant ACs were characterized on the basis of similarities in their surface chemical features and differences in their micropore size distributions. The Adsorption of Phenol was carried out in static conditions at ambient temperature. The pseudo-second order kinetic model and Langmuir model were found to fit the experimental data very well. The different Adsorption capacities of the ACs towards Phenol were attributed to differences in their micropore size distributions. Adsorption capacity was favoured by the volume of pores with a size smaller than 1.4 nm; but restricted by pores smaller than 0.8 nm.

J Przepiórski - One of the best experts on this subject based on the ideXlab platform.

  • Enhanced Adsorption of Phenol from water by ammonia-treated activated carbon.
    Journal of hazardous materials, 2006
    Co-Authors: J Przepiórski
    Abstract:

    Influence of treatment with gaseous ammonia on Adsorption properties toward Phenol from water was examined for commercially available CWZ-series activated carbons. The treatment was carried out at elevated temperatures ranged from 400 degrees C to 800 degrees C for 2 h. In comparison with untreated material, activated carbons modified with ammonia demonstrated enhanced Adsorption of Phenol from water. The enhancement depended on the treatment temperature and porous structure of studied activated carbons. Fourier transform infrared spectroscopy (FTIR) measurements confirmed presence of N-containing species in ammonia-treated activated carbons. Optimal conditions of the modification with ammonia were determined. Influence of the N-containing groups and porous structure of activated carbons on Adsorption of Phenol is discussed.

  • Enhanced Adsorption of Phenol from water by ammonia-treated activated carbon
    Journal of Hazardous Materials, 2006
    Co-Authors: J Przepiórski
    Abstract:

    Abstract Influence of treatment with gaseous ammonia on Adsorption properties toward Phenol from water was examined for commercially available CWZ-series activated carbons. The treatment was carried out at elevated temperatures ranged from 400 °C to 800 °C for 2 h. In comparison with untreated material, activated carbons modified with ammonia demonstrated enhanced Adsorption of Phenol from water. The enhancement depended on the treatment temperature and porous structure of studied activated carbons. Fourier transform infrared spectroscopy (FTIR) measurements confirmed presence of N-containing species in ammonia-treated activated carbons. Optimal conditions of the modification with ammonia were determined. Influence of the N-containing groups and porous structure of activated carbons on Adsorption of Phenol is discussed.

Ewa Lorenc-grabowska - One of the best experts on this subject based on the ideXlab platform.

  • Influence of pore size distribution on the Adsorption of Phenol on PET-based activated carbons.
    Journal of colloid and interface science, 2016
    Co-Authors: Ewa Lorenc-grabowska, Maria A. Diez, Grażyna Gryglewicz
    Abstract:

    The role of pore size distribution in the Adsorption of Phenol in aqueous solutions on polyethylene terephthalate (PET)-based activated carbons (ACs) has been analyzed. The ACs were prepared from PET and mixtures of PET with coal-tar pitch (CTP) by means of carbonization and subsequent steam and carbon dioxide activation at 850 and 950 °C, respectively. The resultant ACs were characterized on the basis of similarities in their surface chemical features and differences in their micropore size distributions. The Adsorption of Phenol was carried out in static conditions at ambient temperature. The pseudo-second order kinetic model and Langmuir model were found to fit the experimental data very well. The different Adsorption capacities of the ACs towards Phenol were attributed to differences in their micropore size distributions. Adsorption capacity was favoured by the volume of pores with a size smaller than 1.4 nm; but restricted by pores smaller than 0.8 nm.

Hsisheng Teng - One of the best experts on this subject based on the ideXlab platform.

  • Liquid-Phase Adsorption of Phenol onto Activated Carbons Prepared with Different Activation Levels.
    Journal of colloid and interface science, 2000
    Co-Authors: Chien-to Hsieh, Hsisheng Teng
    Abstract:

    Abstract The influence of the pore size distribution of activated carbon on the Adsorption of Phenol from aqueous solutions was explored. Activated carbons with different porous structures were prepared by gasifying a bituminous coal char to different extents of burn-off. The results of Adsorption experiments show that the Phenol capacity of these carbons does not proportionally increase with their BET surface area. This reflects the heterogeneity of the carbon surface for Adsorption. The pore size distributions of these carbons, determined according to the Dubinin–Stoeckli equation, were found to vary with the burn-off level. By incorporating the distribution with the Dubinin–Radushkevich equation using an inverse proportionality between the micropore size and the Adsorption energy, the isotherms for the Adsorption of Phenol onto these carbons can be well predicted. The present study has demonstrated that the heterogeneity of carbon surface for the Phenol Adsorption can be attributed to the different energies required for Adsorption in different-size micropores.

Krisztina László - One of the best experts on this subject based on the ideXlab platform.

  • Competitive Adsorption of Phenol and 3-chloroPhenol on purified MWCNTs.
    Journal of colloid and interface science, 2012
    Co-Authors: Ajna Tóth, Andrea Törőcsik, Etelka Tombácz, Krisztina László
    Abstract:

    A commercial multiwall carbon nanotube and its carboxylated derivate (CNTC and COOHC, respectively) was used after purification to study the competitive Adsorption of Phenol (P) and m-chloroPhenol (CP) from 0.1 M aqueous NaCl solutions without external pH control. The Adsorption takes place practically exclusively on the external surface of the nanotubes. The uptake of P is suppressed in comparison to its single solute behaviour on both nanotubes, independently of the initial pollutant concentration. The uptake of CP however is more sensitive to the concentration and the surface chemistry of the nanotube. The measured co-Adsorption isotherms were compared to the isotherms calculated from the competitive Langmuir model (CLM). Preferential Adsorption of CP was observed in about 95% of the relative concentration range. The total Adsorption may exceed the corresponding single component sorption capacity.

  • heterogeneity of activated carbons with different surface chemistry in Adsorption of Phenol from aqueous solutions
    Applied Surface Science, 2006
    Co-Authors: Krisztina László, Przemyslaw Podkościelny, A Dąbrowski
    Abstract:

    Abstract The heterogeneity of activated carbons is investigated on the basis of Adsorption isotherms of Phenol from dilute aqueous solutions at different values of pH in the solution. The original carbon studied was prepared from polyethyleneterephtalate (PET). Its various oxygen surface functionalities were systematically changed by additional nitric acid and heat treatments. The Dubinin–Astakhov Adsorption-isotherm equation was used to evaluate the parameters characterizing the Adsorption of Phenol from dilute water solutions on activated carbon surfaces. Adsorption energy distribution functions were calculated by the INTEG algorithm, based on a regularization method. Analysis of distribution functions for activated carbons provides significant comparative information about their energetic heterogeneity. Moreover, a comparison of the resulting energies obtained from the distributions can be made with enthalpic data.

  • The Effect of Ionic Environment on the Adsorption of Phenol
    Colloids for Nano- and Biotechnology, 1
    Co-Authors: Ajna Tóth, Csaba Novák, Krisztina László
    Abstract:

    The effect of the ionic environment on the Adsorption of Phenol from aqueous solutions was investigated in a predominantly microporous carbon and in a commercial carbon designed for wastewater treatment. It was found that not only the pH of the solution but also the method of its setting affects the Adsorption capacity. Setting the pH with a buffer solution instead of HCl/NaOH results in a reduced Adsorption capacity, owing to the increased number of competing species for Adsorption sites, and also to pore blocking. The latter is less critical for the commercial carbon with wider pores. Thermal desorption of Phenol exhibits an even stronger dependence on pH setting than Adsorption. Upon heating, a mass equivalent to 10–35% of the adsorbed Phenol is retained by the surface as a carbon-rich residue, which may modify not only the chemistry but also the pore volume and the pore size distribution of the carbon.