[Show abstract][Hide abstract] ABSTRACT: The adsorption behaviour and the micro- and mesopore size distributions of commercial palm kernel shell activated carbons
(PKSAC) and other commercial activated carbon are characterized. The results showed that PKSAC are predominantly microporous
materials, where micropores account 68–79% of total porosity. On the other hand, commercial activated carbons: Norit SX Plus,
Calgon 12×40, and Shirasagi “A” activated carbons contained high mesopore fraction ranging from 33 to 52%. The analysis showed
that the degree of mesoporosity of PKSAC is increased steadily with the decrease of particle size. This is due to the presence
of channels interconnect the smaller pores in the interior of smaller particle size PKSAC. The smaller size PKSAC particle
that is highly mesoporous has preformed better on the adsorption of larger molecules such as methylene blue. On the other
hand, bigger size PKSAC particle has better performance on the adsorption of smaller adsorbates such as iodine.
[Show abstract][Hide abstract] ABSTRACT: BACKGROUND: Palm kernel shell activated carbon (OPSA) produced by steam gasification at high temperatures generally results in high surface areas of 1146 to 1600 m2 g−1, attributed to the high volume of micropores (0.43 to 0.56 cm3 g−1). The mesoporosity of naturally occurring activated carbons is observed to increase with decreasing particle size. Mechanical grinding was therefore performed to investigate its effect on the mesoporosity and microporosity of OPSA.
RESULTS: Mechanical grinding had a strong effect on mesopore volume and average pore diameter, with an increase in mesopore volume from 47 to 66% as particle size decreases. Interestingly, no significant effect on the micropore fraction was observed in ground OPSA particles.
CONCLUSIONS: The mechanically ground OPSA particles possessed dual adsorption capabilities due to the high microporosity and moderate mesoporosity contained in the structures. This results in interesting porosity behaviour of palm kernel shell activated carbons and the potential to provide materials of distinct sorption capacities with minimal treatment. Copyright
Full-text · Article · Sep 2009 · Journal of Chemical Technology & Biotechnology