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Adsorption capacity, pore structure and thermal behavior of modified clay containing SSA

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Document pages: 7 pages

Abstract: Sludge ash (SSA) is produced from municipal sludge incineration. The possibility of clay containing 1 or 3 or 5 SSA as landfill liner soil material was evaluated. Batch adsorption, low temperature N2 adsorption and TG-DTA tests were carried out to evaluate the adsorption capacity, microporous structure, thermal stability and composition of soil in Cr (VI) and Pb (II) chemical solutions. With the increase of SSA content in modified clay, the adsorption capacity of modified clay for Cr (VI) and Pb (II) increased gradually. After adsorption, the pore size of the modified clay ranges from 2   nm to 8   nm. With the increase of adsorption capacity, the pore volume decreases and the specific surface area increases. The mass concentration decreased with the increase of Cr (ⅵ) and Pb (ⅱ) adsorption concentration percentage of modified clay increases to 23.4 and 12.6 , respectively. The modified clay containing SSA may be used as a good barrier material to attenuate contamination of Cr(VI) and Pb(II) in landfills.

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