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• W2902080462 abstract "This study demonstrates the importance of selecting an appropriate liquid-to-solid ratio (L∶S) for batch sorption study (BSS) of bentonite (BE). The current recommended L∶S is 20 for BSS of soils and sediments, which works well for most of the soils/sediments. However, for expansive soil like BE, L∶S=20 was found to be inadequate due to the formation of thick gel like consistency preventing proper interaction of metal ion with solid surface. This resulted in considerable underestimation of sorption capacity of BE. Effort was made to identify appropriate L∶S for BE for which there is no specific guideline available in the literature. Under controlled pH condition and Pb2+ as the model heavy metal ion, it was noted that the sorption capacity of BE increases with L∶S beyond 20 and with an increase in initial metal ion concentration. The highest percentage removal of Pb2+ was observed at L∶S=50 and lowest at L∶S=100 for initial concentration greater than 300 mg/L. The minimum L∶S possible for BE is 20, below which the interaction between the solution and soil solids becomes difficult due to formation of a thick gel like consistency. The interaction of BE with Pb2+ was further investigated from the results of field emission scanning electron microscopy (FESEM) integrated with energy dispersive X-ray spectroscopy (EDX). Fourier transform infrared (FTIR) spectrometer was used to identify the variations in interaction between the Pb2+ ions and functional group present on BE for various L∶S. It was concluded that for all practical purposes, L∶S=50 is a suitable ratio for determining sorption capacity of expansive soil like BE." @default.
• W2902080462 created "2018-12-11" @default.
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• W2902080462 date "2019-02-01" @default.
• W2902080462 modified "2023-09-27" @default.
• W2902080462 title "Appropriate Liquid-to-Solid Ratio for Sorption Studies of Bentonite" @default.
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• W2902080462 doi "https://doi.org/10.1061/(asce)ee.1943-7870.0001488" @default.
• W2902080462 hasPublicationYear "2019" @default.
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