Highly selective separation and recovery of Pd(II) from the automotive catalyst residue with the thiocarbamoyl substituted azothiacalix[4]arene derivative

New reagents for selective extraction of Pd(ii) and Au(iii) from acidic media

“…12 The extraction of palladium from industrial waste of various origins is usually performed through leaching and solvent extraction. 23 Organic extractants of various types have been tested to provide more or less selective extraction of palladium(II): nonylthiourea, 24 triisobutylphosphine sulfide, 25 phosphonium compounds, 26 dithiodiglycolamide, 27 N,N 0 -dimethyl-N,N 0 -dicyclohexylthiodiglycolamide, 28,29 heterocyclic dithioether ligands, 30 substituted azothiacalix [4]arene derivatives, 31,32 N,N 0 -dimethyl-N,N 0 -dicyclohexylsuccinamide, 33 alkylated dioxadithiacrown ether derivatives, 34 and 4-[(hexylsulfanyl)methyl]-3,5-dimethyl-1-phenyl-1H-pyrazole, 35 2-[(2-ethylhexyl)thio]benzoxazole. 36 Despite the fact that many classes of organic compounds have been investigated as extractants for Pd(II), bis(a-amine oximes ) have not yet been investigated in this capacity.…”

Highly Selective Adsorption and Recovery of Palladium from Spent Catalyst Wastewater by 1,4,7,10-Tetraazacyclododecane-Modified Mesoporous Silica

“…To improve the selectivity of recovery, the adsorbent is often modified, such as combining substances containing specific complex groups with palladium. The carriers commonly used for metal adsorption and recovery are silica, , activated carbon, ,, carbon black, graphene oxide, carbon nanotubes, organic macromolecules, biomass, and other materials. − The characteristic complex groups for palladium contain amine, ,− amide, carboxyl, hydroxyl, and so on . However, there are still problems in precious metal recovery research, such as low recovery rates, poor selectivity, and poor regeneration effects.…”

Separation of Palladium along with Minor Actinides byisoBu-BTP/SiO2-P Adsorbent from High-Level Liquid Waste

“…As a member of platinum group metals (PGM), palladium is considered as one of the most important metals in many advanced technological applications, especially in fuel cells, autocatalysis, and oil processing. , There is an increasing demand for palladium, while its abundance in the earth crust is very low (∼10 –6 %) . Hence, the contradiction between demand and potential natural sources becomes increasingly sharp, and must be resolved by seeking alternate resources.…”