Potassium Recovery from Potassium Solution and Seawater Using Different Adsorbents

The potassium (K) sorption characteristics with three adsorbents, natural zeolite, ammonium acetate-treated and manganese nodule, were studied compared to see the potential use of nodule as an alternative K adsorbent. In general, Langmuir isotherm could fit in KCl solutions at different pH conditions better than Freundlich isotherm. Based on parameters, maximum was greater for zeolite-based adsorbents (i.e., 40–42 mg g−1) 2.0 acidic conditions, while 9.7 showed neutral conditions. With seawater samples, higher recovery (4–14%) (0–8.8%). followed pseudo-second-order kinetics rates treated zeolite zeolite. repeated tests that potentially be reused up times without any significant loss capacity, lost its capacity after single test. Overall, results show may under certain yet are generally nodule. Thus, more studies enhance using including surface modified recommended.