A high-strength polyvinyl alcohol hydrogel membrane crosslinked by sulfosuccinic acid for strontium removal via filtration

Abstract

This study considered the removal of strontium (Sr 2+) from contaminated water using a filtration membrane that exhibits good mechanical strength, high adsorption capacity, and the ability to be regenerated and reused. Polyvinyl alcohol hydrogel membranes were prepared by crosslinking with sulfosuccinic acid in different ratios (2.5, 5, 10 and 20 mol% relative to the PVA monomer), named as PSA2.5, PSA5, PSA10 and PSA20. All PSA membranes showed good Sr 2+ adsorption over a wide pH range (pH 2-12), and maintained rapid removal kinetics (> 95 % Sr 2+ recovered from 5 ppm Sr 2+ within 4 h). Furthermore, the Sr 2+ adsorption capacities of PSA2.5, PSA5, PSA10 and PSA20 were 27.6, 45.8, 56.3, and 55.3 mg/g, respectively, based on the Langmuir adsorption isotherm. From the four PSA membranes, PSA5 was selected for further filtration studies due to its favorable mechanical and adsorption properties. When filtering 5 ppm Sr 2+ and 250 ppm Ca 2+ , corresponding to the Ca 2+ concentration in the wastewater at the Fukushima nuclear plant, 87% Sr 2+ was removed using the PSA5 membrane following multiple cycles of regeneration and reuse. Moreover, the tensile strength of the PSA5 membrane remained high (> 100 MPa) following five consecutive uses.

Evaluation of the Kinetic of Cu2+ Adsorption in the PVA Membranes Crosslinked with Sulfosuccinic and Citric Acids

“…After the adsorption equilibrium, Cu 2+ concentration in the remaining solution was measured. The Cu 2+ distribution coefficients () were calculated using Eq 4., where is the distribution coefficient (in Lg -1 ), is the adsorption equilibriun capacity (in mg.g -1 ) and is the concentration equilibrium (in mg.L -1 ) (SHI et al, 2008;ZHANG et al, 2016;YOON et al, 2019;BEDIAKO et al, 2019).…”

Preparation and performance of UiO‐66‐(COOH)2‐based mixed matrix membranes for efficient separation of Sr2+ ions from aqueous solutions

“…89 Sr and 90 Sr are essential fission products of nuclear waste, and their fission yields are very high 2 . On the one hand, owing to Sr 2+ ions being similar to Ca 2+ ions of hydroxyapatite, which is the main inorganic component of bone, 3 Sr 2+ ions can be highly concentrated in the human bone system. On the other hand, 90 Sr can be used as a radioactive source of β ‐rays, which are harmful to the human body 4 .…”

Experimental and Modeling Studies of Sr2+ and Cs+ Sorption on Cryogels and Comparison to Commercial Adsorbents

“…Typical adsorbents such as activated carbons (AC), natural zeolites, and clays have been used, but they are often characterized by low adsorption capacities or the need to be chemically treated to acquire desirable adsorption properties. − Natural sorbents like zeolites and AC usually show low removal capacities in the ranges of 1.3–10 mg/g for Sr 2+ ions and 0.7–51 mg g −1 for Cs + . Synthetic polymers like hydrogels and cryogels can reach much higher removal capacities, up to 312 mg g −1 for Sr 2+ and 420 mg g −1 for Cs + ions. ,,− A list of literature works investigating Cs + and Sr 2+ ions adsorption from aqueous media onto different sorbents is reported in Table S1.…”