Unconventional ion exchange resins and their retention properties for Hg2+ ions

Mercury sorption on a thiocarbamoyl derivative of chitosan

“…In the case of thiol-grafted chitosan gel beads, Merrifield et al [52] cited sorption capacities of 2, 2.3, 3.5 mmol Hg g −1 at pH 2.2, 4 and 5, respectively. Higher sorption capacities (4.5-5 mmol Hg g −1 ) were obtained at pH 5.2 by Neagu et al [6] using quaternized resin (obtained by grafting of chloroacetamide). Jeon and Höll [44] prepared an aminated derivative of chitosan (reaction of ethylenediamine with chitosan through glutaraldehyde linkage): the maximum sorption capacity drastically decreased from 2.2 mmol Hg g −1 at pH 6 down to 0.5 mmol Hg g −1 at pH 4.…”

“…The pH had a poor effect under selected experimental conditions and the sorbent capacities were comparable. It is noteworthy observing that raw chitosan lost most of its sorption efficiency when the pH decreased to pH 3 (and below) [6,44], contrary to the thiocarbamoyl derivatives that maintained a high sorption capacity even at pH 2. Pohl and Prusisz [16] showed that Duolite GT-73 (a resin bearing thiol groups) was very efficient for mercury binding in HCl solutions.…”

“…The dramatic example of contamination in Minamata (Japan) showed the potential impact of the accumulation of mercury in the food chain on population health. Conventional processes for the recovery of mercury from industrial effluents consist in precipitation [1][2][3][4], cementation [5], ion exchange [6][7][8][9], solvent extraction [10][11][12][13] and adsorption [6,[14][15][16][17][18][19][20][21]. Sorption processes may use synthetic resins but an increasing interest has been focused on biosorbents for the last decades.…”

Immobilization of mercury (II) from aqueous solution using Al 2 O 3 -supported nanoscale FeS

“…In recent years, numerous treatment techniques have been developed to deal with mercury pollution from aquatic ecosystem, such as adsorption [8], ion exchange treatment [9], chemical precipitation [10], bio-removal [11], and membrane filtration [12]. Among which, adsorption has attracted more attention due to convenient operation, high efficiency, low secondary pollution and cost [13].…”

Preparation and Characterization of Styrene Bearing Diethanolamine Side Group, Styrene Copolymer Systems, and Their Metal Complexes

“…The ligands are very important for metal ion complexation because of their hydrophilicity, accessibility, and high capacity [5]. Such ligands include iminodiacetates [4,6], amides [7], hydroxylamines [8], Schiff bases [9], and phosphonates [10]. Usually, these ligands are prepared by the modification of crosslinked copolymers polystyrene, poly (vinyl benzyl) chloride, poly (glycidyl methacrylate), and polyacrylic acid [11].…”