Preparation and modification of forcespun polypropylene nanofibers for adsorption of uranium (VI) from simulated seawater

Synthesis and characterization of microparticles from artificial medical mask waste by freeze-drying method

“…The strong and broad peak at 2800 -3000 cm -1 indicates the presence of -NH group [11]. The weak peaks at (3200 -3400 cm -1 ) show the presence of -OH and -NH groups in polypropylene microparticles [12] . The decrease as the increase of concentration in the absorbance at (3200 -3400 cm -1 ) indicates the existence of polypropylene is higher [13].…”

Uranium extraction from seawater: material design, emerging technologies and marine engineering

“…Therefore, shaping the adsorbent to increase the SSA appears to be one of the feasible ways to improve its adsorption efficiency. To this end, various effective means have been adopted to increase the SSA of fiber adsorbents, mainly involving changing the cross-sectional shape, 119,120 reducing the diameter of fibers, [121][122][123][124][125][126] or a combination of the two. Besides, adsorbents with implementable structures such as sponges, hydrogels and membranes have been exploited with high SSA and high affinity to uranium.…”

“…These microfiber adsorbents still suffer from relatively large diameters and small SAA. 120 The development of spinning technologies, including but not limited to electrospinning, 121,122 forcespinning 123 and solution blow spinning approaches, 124–129 has gained increasing attraction in recent years, providing reliable ways to produce fibers with diameters at nanometer levels and adsorbents with high SSA. Typically, electrospinning is a versatile method used to fabricate nanofiber mats in large quantities.…”

Oxime-modified hierarchical self-assembly polyimide microspheres for high-efficient uranium recovery from wastewater

“…S6, † the elution efficiency reached 89% only in the first 2 min and eventually reached 95.5% at 4 min, which exhibited a rapid desorption process compared with many reported adsorbents. 26,[56][57][58] The rapid desorption performance could attribute to the large open space between the nanosheets of HSPI-O, which could facilitate the flow of eluent. Moreover, because HSPI-O has almost no micropores or mesopores, uranyl ions were just fixed on the HSPI-O nanosheet surface, which avoided the retention of uranyl ions in these micropores or mesopores, leading to a rapid desorption process.…”