Cationic polymer-immobilized polysulfone-based fibers as high performance sorbents for Pt(IV) recovery from acidic solutions

Removal of hydrolyzed Reactive Black 5 from aqueous solution using a polyethylenimine–polyvinyl chloride composite fiber

“…These results suggest that greater contribution of the surface adsorption is the rate controlling step [27]. Since the plots of q t versus t 0.5 did not pass through the origin, it means that the intra-particle diffusion was not only rate controlling step [13]. The adsorption process may consist of complex mechanisms of both surface adsorption and the intra-particle diffusion [28].…”

“…PEI-grafted anaerobic granular sludge exhibited improved sorption capacity toward Acid Red 18 removal [12]. Recently, PEI-coated polysulfone-Escherichia coli biomass composite fiber also showed a good sorption performance for anionic Pt(IV) [13]. Sun et al [14] developed PEI-functionalized poly(vinyl alcohol) magnetic microsphere for removal of Cr(VI) from aqueous solution.…”

Selective recovery of Pd(II) from extremely acidic solution using ion-imprinted chitosan fiber: Adsorption performance and mechanisms

“…It confirmed that thiourea was not modified onto the IIF. The bands observed at 1059 and 1027 cm −1 are assigned to the C N stretching vibration in the primary amines and the C O stretching vibration in the primary alcohol, respectively [3,20]. However, as shown in IIF-b, the band at ∼3361 cm −1 was identified as OH or NH 2 stretching vibration shifted to 3405 cm −1 ; the peak attributed to N H shifted from 1652 cm −1 to 1623 cm −1 , respectively, after the Pd(II) adsorption; and the peaks at 1059 and 1027 cm −1 overlapped into one sharp peak at 1027 cm −1 , indicating that amine group participates in the Pd(II) adsorption.…”

“…Platinum group metals (PGMs), e.g., Pd, Pt, Ru, and Ir, are precious metals and have been extensively used in many fields including catalysis, electrical and electronic industries, owing to their specific physicochemical properties [1][2][3]. The increased market demand and limitation in rare reserves impart high commercial value to these precious metals.…”

The Preparation of Modified Industrial Waste Polyacrylonitrile for the Adsorptive Recovery of Pt(IV) from Acidic Solutions

“…Thus, the powder-form sorbents usually face problems such as pressure drops and clogging in column experiments. For these reasons, the sorbents need to be immobilized [2] by forming them as capsules, beads, or fibers [4,5,6]. In general, the immobilization process mostly uses organic solvents or reactive chemicals, rendering the overall process cost-ineffective and environmentally unfriendly, though the resulting sorbents do have good sorption capability.…”