Gold-recovery PVDF membrane functionalized with thiosemicarbazide

Affinitive Poly(vinylidene difluoride) Membranes for Enhancing Au(III) Separation with Extremely High Selectivity

“…In addition, the operating pressure of membrane chromatography in the filtration process is low due to the small height‐to‐diameter ratio and the open membrane pore structure, which further makes this technology economically more acceptable . In fact, membrane chromatography has already demonstrated its great potential in metal ion removal and recovery , especially for gold , .…”

“…The Th‐PVDF membrane was prepared by nonsolvent‐induced phase separation as introduced elsewhere . Briefly, Th‐PVDF and PVP were dissolved in NMP with a defined ratio, i.e.,Th‐PVDF:PVP:NMP = 13:2:85 wt %) at 60 °C under mechanical stirring, and after the air bubbles were released, the formed solution was cast into a wet membrane on a glass plate using a casting knife.…”

Adsorptive filtration of low‐concentration lead with wet‐laid filter media made from nano‐TiO2 decorated cellulose fibers

“…However, for column adsorption, the packed bed could cause a high pressure drop and slow mass transfer due to the long bed height and the small‐sized resin whose porous structure requires a long intra‐particle diffusion path‐length. Alternatively, adsorptive and affinitive membranes were developed and used in membrane chromatography to lower the pressure drop and to enhance mass transfer . In our previous work, we found that chitosan and cellulose‐based affinitive membranes showed higher water flux when used for removing heavy metals by adsorptive filtration due to their hydrophilicity and non‐woven structure .…”

“…Alternatively, adsorptive and affinitive membranes were developed and used in membrane chromatography to lower the pressure drop and to enhance mass transfer. 8,9 In our previous work, we found that chitosan and cellulose-based affinitive membranes showed higher water flux when used for removing heavy metals by adsorptive filtration due to their hydrophilicity and non-woven structure. 10,11 Among them, nano-TiO 2 modified cellulose composite fibrous materials exhibited outstanding filtration performance with good selectivity to Pb 2+ ion.…”

Synthesis of Fulvic Acid-Coated Magnetite (Fe₃O₄^–FA) and Its Application for the Reductive Adsorption of [AuCl₄]^–

“…In recent years, large attention has been given to non-cyanide and mercury methods for gold recovery [1][2][3][4][5][6]. Non health threatening alternative approaches has widely been conducted by scientists [7], yet in comparison with cyanidation [8][9][10][11], most of alternative approaches are still uneconomical.…”