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• W2013994850 abstract "Activated carbons of different characteristics have been prepared from dried sewage sludge using CO 2 , air and KOH as activating agents. The adsorption capacity of the resulting materials has been checked using 4-chlorophenol as a target compound in aqueous solution. CO 2 and air-activation led to carbons of low BET area which increased with the activation temperature but did not reach 100 m 2 /g at the best. The high ash content of the starting material (23%, d.b.) limits the development of porosity since the partial gasification does not affect the inorganic matter. In the case of air-activation, the resulting surface remains fairly low even in ash-free basis, reaching no more than 250 m 2 /g. Activation with KOH allows a much higher development of porosity. Using a KOH to solids ratio of 3:1 and a temperature of 750 °C a BET area above 1800 m 2 /g with a mesopore volume higher than 0.35 cm 3 /g was reached. In spite of those dramatic differences on the textural properties, the air-activated carbons showed an adsorption capacity for 4-chlorophenol of almost 85% that of the KOH-activated carbons. These results warrant in principle air-activation at moderate temperature as a promising way of sewage sludge valorisation to inexpensive adsorbents for the removal of water pollutants. ► Sewage sludge as precursor for activated carbon for the removal of water pollutants. ► AC with different porous structure were obtained by CO 2 , air and KOH as activating agents. ► Air-activated carbons showed a high 4-chlorophenol adsorption with low BET areas. ► Inexpensive AC can be prepared by partial gasification with air at low temperatures." @default.
• W2013994850 created "2016-06-24" @default.
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• W2013994850 date "2011-08-01" @default.
• W2013994850 modified "2023-10-16" @default.
• W2013994850 title "Activated carbons from sewage sludge" @default.
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• W2013994850 doi "https://doi.org/10.1016/j.desal.2011.04.059" @default.
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