Adsorption kinetics, isotherms and desorption studies of mercury from aqueous solution at different temperatures on magnetic sodium alginate-thiourea microbeads

Synthesis of a Highly Selective Scavenger of Precious Metals from a Printed Circuit Board Based on Cellulose Filter Paper Functionalized with a Grafted Polymer Chain Bearing N-Methyl-2-hydroxyethylcarbamothioate Moieties

“…Adsorption characters of adsorbents, such as selectivity and adsorption capacity, depend on the structures of the sulfur functional groups bound to the adsorbents. 29 While sulfur functional groups have affinities with soft metals, most sulfur functional groups, such as thiourea 30 , 31 and dithiocarbamate anions, 32 − 35 are not effective for selective attraction due to their affinities with wide ranges of metals. The selective collection of precious metals such as Ag(I), Pd(II), and Au(III) requires appropriate designs of the ligands.…”

“…Adsorption characters of adsorbents, such as selectivity and adsorption capacity, depend on the structures of the sulfur functional groups bound to the adsorbents . While sulfur functional groups have affinities with soft metals, most sulfur functional groups, such as thiourea , and dithiocarbamate anions, − are not effective for selective attraction due to their affinities with wide ranges of metals. The selective collection of precious metals such as Ag­(I), Pd­(II), and Au­(III) requires appropriate designs of the ligands. − We have focused on soft thiocarbonyl moieties with a lower contribution of harder tautomeric thiol groups. , For the support of the sulfur ligand, the authors have focused on cellulose filter paper (CFP) that is advantageous due to its abundance, inexpensiveness, accessibility, mechanical strength, and high surface area. , In our previous work, we synthesized the effective adsorbent CFP- g -PHCTMA from O -1-mercapto-3-phenoxypropan-2-yl-2-hydroxyethylcarbamothioate (HCT) and CFP grafted with poly­(glycidyl methacrylate) (CFP- g -PGMA).…”