Selective adsorption of molybdenum(VI) from Mo–Re bearing effluent by chemically modified astringent persimmon

Bio-Reclamation of Strategic and Energy Critical Metals from Secondary Resources

“…Using the brown algae Laminaria japonica in its modified cross-link gel structure exhibited a maximum 97% sorption with the capacity 37.2 mg/g at pH 6.0 [106]. The result showed a higher affinity for Re in comparison with the earlier used sorbents of persimmon and orange peel [107,108]. This indicated the positive effect of H 2 SO 4 -modified structure on rhenium adsorption that was resultant of the increased surface area of the sorption sites on algae cell walls.…”

Tannin-based biosorbents for environmental applications – A review

“…Astringent persimmon gel, prepared with formaldehyde, exhibited high selectivity towards Mo(VI), in presence of Ca(II) and Re(VII). For increasing HCl concentrations (1 and 3 mol L À1 ), it was also selectively removed in the presence of other metals, such as Cu(II), Pb(II), Fe (III), Zn(II), Mn(VII) and Ni(II) [98]. A remarkably high adsorption capacity of 1.06 mmol g À1 (101 mg g À1 ) was found, with an inferred adsorption mechanism based on molybdenum esterification with catechol or pyrogallol groups.…”

Highly enhanced selectivity for the separation of rhenium and molybdenum using amino-functionalized magnetic Cu-ferrites

“…Various techniques such as solvent extraction [2,3], ion exchange [4,5], chemical precipitation [6], and adsorption [7,8] have been used extensively for the recovery of rhenium and molybdenum. Moreover, adsorption techniques have gained favor recently due to their efficiency in the removal [9,10]. Various sorbents, such as active carbon [11][12][13], nano-Al 2 O 3 [14], naturally occurring materials (rice husk, peanut shells, corn cobs etc.…”