Photoinduced Multiple Effects to Enhance Uranium Extraction from Natural Seawater by Black Phosphorus Nanosheets

Abstract

Based on the photoinduced photothermal, photoelectric, and photocatalytic effects of black phosphorus (BP) nanosheets, a BP‐PAO fiber with enhanced uranium extraction capacity and high antibiofouling activity is fabricated by compositing BP nanosheets into polyacrylamidoxime (PAO). The photothermal effect increases the coordination interaction between UO22+ and the functional amidoxime group, and the photoelectric effect produces the surface positive electric field that exhibits electrostatic attraction to the negative [UO2(CO3)3]4−, which all increase the capacity for uranium adsorption. The photocatalytic effect endows the adsorbent with high antibiofouling activity by producing biotoxic reactive oxygen species. Owing to these three photoinduced effects, the photoinduced BP‐PAO fiber shows a high uranium adsorption capacity of 11.76 mg g−1, which is 1.50 times of the PAO fiber, in bacteria‐containing natural seawater.

Regenerable Covalent Organic Frameworks for Photo‐enhanced Uranium Adsorption from Seawater

“…The uranium adsorption capacity of NDA‐TN‐AO increased by 33.0 % after 27 days of light irradiation, while the uranium adsorption capacity of BDA‐TN‐AO increased only by 21.2 %, which can be ascribed to the much better photocatalytic and photoelectric activity of NDA‐TN‐AO. Both the NDA‐TN‐AO and BDA‐TN‐AO showed selectivity to uranium and vanadium in seawater, but not other metals (Figure d), consistent with the selectivity of the amidoxime group . Furthermore, the anti‐biofouling behaviors of NDA‐TN‐AO and BDA‐TN‐AO were tested in seawater for a long time.…”

“…This process allowed efficient regeneration of binding sites for further binding of additional U VI . Furthermore, the excellent photoelectric effect of NDA‐TN‐AO could efficiently release electrons from the skeleton and form a surface positive electric field around the NDA‐TN‐AO skeleton, which would show a strong electrostatic attraction to [UO 2 (CO 3 ) 3 ] 4− , further increasing the uranium adsorption capacity …”

Low Band Gap Benzoxazole‐Linked Covalent Organic Frameworks for Photo‐Enhanced Targeted Uranium Recovery

“…Owing to the excellent photocatalytic activity of Tp‐DBD, it can effectively produce biotoxic ROS, and show a high anti‐biofouling performance by destroying biological entities. [ 5a ] In this study, we used bacteria as targets. The result showed that the Tp‐DBD had an ultra‐high anti‐bacterial activity against the tested bacterial strains (>95%), which is much higher than that of olefin‐linked NDA‐TN‐AO (>85%), [ 6b ] including both Gram‐negative Pseudomonas aeruginosa , and Vibrio alginolyticus , with Gram‐positive Staphylococcus aureus , and Bacillus cereus ( Figure a,c).…”

“…[ 1 ] Selective uranium recovery from seawater could satisfy the growing demand for energy. [ 2 ] However, several key bottlenecks seriously hinder selective recovery of uranium from seawater, including abundant competitive ions, [ 3 ] extremely low uranium concentration, [ 4 ] serious biofouling, [ 5 ] and complex marine corrosive environment. [ 6 ] To realize selective recovery of uranium from seawater, adsorbents with high specific affinity, prominent capacity, fast equilibrium rate, anti‐biofouling activity, and long cycle life are required.…”

Overview of Ionogels in Flexible Electronics

“…[22,23] Various researches have been developed to use hydrogels as flexible sensors, [24][25][26] supercapacitors, [27] lithium batteries, [28] drug release, [29] actuators, [30] etc. However, due to the evaporation of aqueous solution in hydrogels, [31][32][33] the decreased conductivity and mechanical properties of hydrogels make it difficult to apply the hydrogels to flexible electronics. [34,35] Although some hygroscopic salts have been added to hydrogels to minimize this problem, the evaporation has not been prevented.…”