Valuable rubidium extraction from potassium reduced seawater brine

Acid mine drainage treatment by integrated submerged membrane distillation–sorption system

“…This affirmed that heat treatment did not change the crystal structure. Further, the XRD spectra also established that the natural Australian zeolite used in this study corresponded to that of the structure of clinoptilolite, as reported by previous papers (Nguyen et al, 2015;Naidu et al, 2018).…”

“…Overall the results showed that modified (500 °C heat treated) zeolite in powder form enabled to remove heavy metals from AMD attributed to a combination of ion exchange, electrostatic sorption and partial precipitation. Nevertheless, it is a challenge to use the powdered form zeolite in ion exchange filter columns (Naidu et al, 2018). For this purpose, the potential of an integrated system, submerged DCMD with zeolite was evaluated in the subsequent section.…”

“…This configuration enables to achieve a compact system with reduced heat losses, attributed to the elimination of feed recirculation and reheating. Another promising aspect of submerged DCMD is its flexibility to be used as an integrated single system such as a submerged membrane-sorption system (Naidu et al, 2018). The application of submerged DCMD as an integrated single system for heavy metal removal while simultaneously producing fresh water and concentrating AMD has yet to be explored.…”

Rubidium ion Capture with a phosphotungstic acid-functionalized finger-citron-residue-based carbon

“…Consistently, the results of the adsorption kinetics (Table S.I.5 †) were tted into three typical models (pseudo-rst-order, pseudo-second-order and intradiffusion). 32,33 The tting results are recorded in Table S.I.6, † from which we can conclude that the adsorption kinetics of this process ts well to the pseudo-second-order adsorption kinetics model with a R 2 value larger than 0.9995. Furthermore, based on the tting results of the particle diffusion model of q t versus Fig.…”

Metals Recovery from Seawater Desalination Brines: Technologies, Opportunities, and Challenges

“…Ongoing research has focused on the recovery of Cs + , Rb + , Li + , Sr 2+ , and U­(VI) from seawater and its brine. With regard to potential extraction methods, we emphasize adsorption and electrochemical separation methods (Table ) due to their capacity for selective resource recovery in complex mixtures such as seawater brine, their low energy requirements, and their flexibility of chemical modification and operation, including potential use in an integrated system with membrane processes. − The integration of adsorbent and membrane processes , is highly favorable for simultaneous water and resource recovery.…”