Adsorbents from Spent Zeolites

摘要

Spent zeolites from petroleum refining processes can be used for the extraction and concentration of toxic elements (As, Pb, and Hg) from wastewater because they possess a better sorption capacity in comparison with that of the KAD-iodine commercial sorbent intended for the purification of wastewater. The amounts of arsenic and mercury concentrated on zeolite surfaces for 120 h were greater than their amounts in the purified wastewater by factors of 4 and 16, respectively. The degree of removal of the cesium-137 radi-onuclide from wastewater by spent zeolites was higher by two orders of magnitude than those for natural sor-bents and the BAU carbon adsorbent, and this value for~(60)Co was higher by an order of magnitude.