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Heavy metal removal from aqueous solution using carbonaceous K2 S-impregnated adsorbentinfo

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keyboard_arrow_downkeyboard_arrow_upVinod GargVinod GargVinod GargVinod GargVinod Garg

2009, Journal of Environmental Sciences

https://doi.org/10.1016/S1001-0742(08)62480-8downloadDownload PDFdescriptionSee full PDFvisibility

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Abstract

A novel carbonaceous adsorbent for heavy metal removal was prepared from raw coal by one-step simple sulfur impregnation using K 2 S. Raw coal was mixed with K 2 S powder and then heated at 800°C for 30 min in nitrogen to produce K 2 S char. The sulfur content and form in K 2 S char were determined, and the ability of K 2 S char to adsorb Zn 2+ , Cd 2+ and Pb 2+ was examined. The K 2 S impregnation was effective at impregnating sulfur into coal, especially in the form of elemental, thiophenic and sulfatic sulfur. The sulfur content of K 2 S char was higher than those of raw coal and pyrolysis char. The Zn 2+ removal in 2.4 mmol/L of Zn 2+ solution by K 2 S char was higher than raw coal with the removal rate of 100%. K 2 S char adsorbed Pb 2+ and Cd 2+ in 24 mmol/L of Pb 2+ and Cd 2+ solution with the removal rate of 97% and 35%, respectively. The elution extents of adsorbed Pb 2+ and Cd 2+ were zero in distilled water and 27% in 0.1 mol/L HCl solution. These results indicated that an effective adsorbent for heavy metal ions was prepared from coal using K 2 S sulfur impregnation, and that the adsorbed metals were strongly retained in K 2 S char.

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    Cited by (2)

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    Sulfurized activated carbons and their mercury adsorption/desorption behavior in aqueous phase

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