Recovery of K⁺from concentrates from brackish and seawater desalination with modified clinoptilolite

Valuable rubidium extraction from potassium reduced seawater brine

“…The XRD composition of the original zeolite was consistent with other studies, matching the structure of natural clinoptilolite zeolite (Wang et al, 2007;Guo et al, 2016). The same diffraction peaks were observed for both the original and K sorbed zeolite, confirming no changes of crystal structure occurred upon K sorption by zeolite (Fig.…”

“…2a). Similar observations were made by other studies on K and Cs sorption with zeolite (Smičiklas et al, 2007;Guo et al, 2016). The slightly lower K sorption at low pH (below pH eq 6) could be due to the competition of H with K for sorption sites in highly acidic solution.…”

Exploiting the Nutrient Potential of Anaerobically Digested Sewage Sludge: A Review

“…Zeolites are used for both N-NH 4 + and P-PO 4 3− removal [88]; P-PO 4 3− can be adsorbed by zeolite, although the removal efficiency has been reported to be much lower than that of N-NH 4 + [89]. This is due to the fact that zeolite, or rather, clinoptilolite has a higher selectivity for monovalent ions such as N-NH 4 + and K + [85,[90][91][92]. The best results in terms of removal/recovery of N-NH 4 + were obtained with the use of mesolite [93] and polymeric resins [92], of 95% and 98%, respectively.…”

The effect of ammonia activation on the desalination potential of natural zeolite

“…In another study, Alsaman et al used acid pretreatment to enhance the adsorption properties of bentonite [20]. Moreover, Guo et al investigated the use of zeolite modified with NaCl to remove K + ions from seawater and brackish water [21]. Acid treatment was also found to be effective for the use of natural zeolite in adsorption processes [22,23].…”