摘要：The feasibility of using potassium-type zeolite (K-type zeolite) prepared from coal fly ash (CFA) for the removal of Hg<sup>2+</sup> from aqueous media and the adsorption/desorption capabilities of various potassium-type zeolites were assessed in this study. Potassium-type zeolite samples were synthesized by hydrothermal treatment of CFA at different intervals (designated CFA, FA1, FA3, FA6, FA12, FA24, and FA48, based on the hours of treatment) using potassium hydroxide solution, and their physicochemical characteristics were evaluated. Additionally, the quantity of Hg<sup>2+</sup> adsorbed was in the order CFA, FA1 < FA3 < FA6 < FA12 < FA24 < FA48, in the current experimental design. Therefore, the hydrothermal treatment time is important to enhance the adsorption capability of K-type zeolite. Moreover, the effects of pH, temperature, contact time, and coexistence on the adsorption of Hg<sup>2+</sup> were elucidated. In addition, Hg<sup>2+</sup> adsorption mechanism using FA48 was demonstrated. Our results indicated that Hg<sup>2+</sup> was exchanged with K<sup>+</sup> in the interlayer of FA48 (correlation coefficient = 0.946). Finally, adsorbed Hg<sup>2+</sup> onto FA48 could be desorbed using a sodium hydroxide solution (desorption percentage was approximately 70%). Our results revealed that FA48 could be a potential adsorbent for the removal of Hg<sup>2+</sup> from aqueous media.
关键词：hydrothermal activation treatment; recycling technology; heavy metal; ion exchange
