Adsorption of heavy metal ions by xanthated sawdust.
Flynn CM Jr.; Carnahan TG; Lindstrom RE
Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 8427, 1980 Jan; :1-12
The Bureau of Mines prepared and investigated xanthated sawdust adsorbents to determine their effectiveness in removing heavy metal ions from dilute aqueous solutions, mine-drainage waters, and brines. Stripping of the metal values from the metal-laden adsorbent was also investigated. The treated sawdusts had an adsorption capacity of 0.3 to 0.4 Meq/g dry adsorbent for mn, CO, ni, cu, ag, zn, cd, hg, or pb from feed solutions with ph 5 to 6. The feed solutions tested included mine-drainage waters and geothermal brine. Effluent metal concentrations as low as 0.05 To 0.1 Mg/l were obtained at effluent ph values of 6 to 9. The order of affinity of metals for the sawdust adsorbent is na<<ca mg mn<zn<ni<cd<pb cu. The presence of ca, mg, or na in concentrations as high as 2 g/l does not seriously impair the heavy- metal adsorption. Metals were desorbed from the metal-laden adsorbent by elution with dilute mineral acids, sodium cyanide, or salts of ethylenediaminetetra-acetic acid.
IH; Report of Investigations
Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 8427