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- W4385373325 abstract "An activated carbon was obtained by chemical activation with phosphoric acid, CM, froma mineral carbon. Afterwards, the carbon was modified with 2 and 5 molL -1 , CMox2 and CMox5 nitricacid solutions to increase the surface acid group contents. Immersion enthalpy at pH 4 values and Pb 2+adsorption isotherms were determined by immersing activated carbons in aqueous solution. Thesurface area values of the adsorbents and total pore volume were approximately 560 m 2 .g -1 and 0.36cm 3 g -1 , respectively. As regards chemical characteristics, activated carbons had higher acid sitescontent, 0.92-2.42 meq g -1 , than basic sites, 0.63-0.12 meq g -1 . pH values were between 7.4 and 4.5 atthe point of zero charge, pH PZC. The adsorbed quantity of Pb 2+ and the immersion enthalpy in solutionof different pH values for CM activated carbon showed that the values are the highest for pH 4, 15.7mgg -1 and 27.6 Jg -1 respectively. Pb 2+ adsorption isotherms and immersion enthalpy were determinedfor modified activated carbons and the highest values were obtained for the activated carbon thatshowed the highest content of total acid sites on the surface." @default.
- W4385373325 created "2023-07-29" @default.
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- W4385373325 date "2006-12-30" @default.
- W4385373325 modified "2023-10-18" @default.
- W4385373325 title "Immersion enthalpy variation of surface-modified mineral activated carbon in lead (II) aqueous solution adsorption: the relation between immersion enthalpy and adsorption capacity" @default.
- W4385373325 doi "https://doi.org/10.26850/1678-4618eqj.v31.4.2006.p15-21" @default.
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