Abstract
The adsorption of phenol on microporous activated carbons (ACs) produced in laboratory from polyethyleneterephtalate (PET), furfuryl alcohol (PFA), polyacrylonitrile (PAN) and anthracene oil pitch (ASN) have been studied. The ACs have been obtained by carbonization and subsequent steam activation at 850 °C to 50 % burn off. For comparison, commercial activated carbons from coconut shell, and CWZ 22 carbon have been applied. All studied ACs are predominantly microporous and have neutral or basic surface characteristics. The pseudo second kinetic model and Langmuir equation were found to fit the experimental data very well. A very good correlation between the volume of pores with a width smaller than 1.4 nm (V1.4) and the volume of phenol calculated from Langmuir monolayer capacity (qm) was found. Based on that, it can be concluded that the phenol adsorption is governed mainly by micropore filling through the π–π dispersion interaction in micropores smaller than double molecular diameter of phenol.
Highlights
Phenol is a common water contamination that can be obstacle even at low concentration its efficient removal is a subject of a great interest
The second mechanism proposes the formation of donor–acceptor complex between the surface electron donor groups and the aromatic ring of phenol that acts as the acceptor
The basic surface characteristics of activated carbons studied in this work has been given in the Table 2
Summary
Phenol is a common water contamination that can be obstacle even at low concentration its efficient removal is a subject of a great interest It is a well-known compound that serves as a model molecule used for characterization of adsorptive properties of different materials. In our previous work a correlation between the adsorption capacity of ACs and the volume of pores with sizes smaller than 1.4 nm was reported for phenol and p-chlorophenol (Lorenc-Grabowska et al 2010; Lorenc-Grabowska and Rutkowski 2014). Due to the fact that phenol is a weak acid and to avoid strong solvent competition effect, for this studies the carbon with neutral or slightly basic surface, low oxygen content but different pore size distribution was selected
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