Photochemically triggered self-extraction of uranium from aqueous solution under ambient conditions

Tang, Duoyue; Shen, Zewen; Yao, Ling; Zhao, Guixia; Wang, Xiangke

doi:10.1016/j.apcatb.2022.122092

Cited by 49 publications

(19 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…27 To better understand the structure and composition of the prepared materials, NMR spectroscopy was employed. The solid-state 13 C NMR was conducted to analyze the chemical structure and subunits of g-C 3 N 4 and CN T s. There are two signal peaks at 165 and 156 ppm in the spectrum of g-C 3 N 4 , which correspond to N 2 -C�NH in heptazine rings and C-N 3 in triazine units, respectively (Figure 3b). 28,29 It can be seen from the spectrum that CN 500 shares the same structure with g-C 3 N 4 as the tri-s-triazine unit.…”

Section: Structural and Morphological Characterizationmentioning

confidence: 99%

“…Element doping, functional group modification, and defect design were applied to improve the adsorption capacity of carbon nitrides . In recent years, the photocatalysis-assisted adsorption method has been proposed and has shown great performance and potential in the application of uranium extraction from seawater. , Despite the two-dimensional (2D) structure, chemical stability, and semiconducting nature, carbon nitrides have gained interest as a photocatalyst. However, there are limited efficient methods for improving the adsorption ability and adjusting the photocatalytic activity, especially adsorption capacity.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Molten Salt Synthesis of Carbon Nitride Nanostructures at Different Temperatures for Extracting Uranium from Seawater

Liu

Huang

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

The importance of extracting uranium from seawater with a green, efficient, and economical strategy has long been paid attention but still faces challenges of low uranyl concentration, high salinity, and competition with carbonate ions. Herein, we report a tunable carbon nitride nanostructure synthesized using molten salt, whose adsorption capacity and photocatalytic activity can be adjusted with the synthesis temperature. With increased synthesis temperature, the adsorption capacity and photocatalytic activity both showed a trend of an increase first and then a decrease. The carbon nitride nanostructure obtained at 550 °C (CN 550 ) exhibited the highest photocatalysis-assisted extraction ability (9.4 times higher than that of g-C 3 N 4 ) and that obtained at 600 °C (CN 600 ) showed the highest adsorption capacity of 1387.0 mg/g, which is 51 times higher than that of g-C 3 N 4 . In addition to the outstanding adsorption ability, CN 600 has a verified extraction rate of nearly 100% of uranyl carbonate with a pH of 6.0, 7.1, and 8.0 in simulated seawater.

show abstract

Section: Structural and Morphological Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Molten Salt Synthesis of Carbon Nitride Nanostructures at Different Temperatures for Extracting Uranium from Seawater

Liu

Huang

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…18 ) has been designed and manufactured for application in the purification of wastewater. However, there are still some key challenges such as rapid recombination of photoelectron (e À )-hole (h + ) pairs in the materials, 19,20 fewer active sites in the catalysts, 21,22 and poor repeatability due to photocorrosion. 23 In order to solve these problems, it is important to develop new catalysts or effective modification methods for achieving excellent photocatalytic performance in the removal of organic pollutants.…”

Section: Introductionmentioning

confidence: 99%

Recent advances and perspectives of emerging two-dimensional transition metal carbide/nitride-based materials for organic pollutant photocatalysis

Zheng

Zhang

Guo

et al. 2023

Mater. Chem. Front.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The short lifetime of photogenerated electrons and limited surface-active sites prevent them from achieving efficient U(VI) photoreduction. Constructing heterojunctions by coupling semiconductor catalysts with co-catalysts, is considered to be the most effective strategy to extend the lifetime of photogenerated carriers and increase the number of surface-active sites …”

Section: Introductionmentioning

confidence: 99%

Dual Charge-Transfer Channels Harmonize Carrier Separation for Efficient U(VI) Photoreduction

Zhang

Xiao

et al. 2023

Inorg. Chem.

View full text Add to dashboard Cite

The low efficient transfer of photogenerated electrons to an active catalytic site is a pivotal problem for the photoreduction of highly soluble hexavalent uranium [U(VI)] to low soluble tetravalent uranium [U(IV)]. Herein, we successfully synthesized a TiO2–x /1T-MoS2/reduced graphene oxide heterojunction (T2–x TMR) with dual charge-transfer channels by exploiting the difference in Fermi levels between the heterojunction interfaces, which induced multilevel separation of photogenerated carriers. Theoretical and experimental results demonstrate that the presence of the electron buffer layer promoted the efficient migration of photogenerated electrons between the dual charge-transfer channels, which achieved effective separation of photogenerated carriers in physical/spatial dimensions and significantly extended the lifetime of photogenerated electrons. The migration of photogenerated electrons to the active catalytic site after multilevel spatial separation enabled the T2–x TMR dual co-photocatalyst to remove 97.4% of the high concentration of U(VI) from the liquid-phase system within 80 min. This work provides a practical reference for utilizing multiple co-catalysts to accomplish directed spatial separation of photogenerated carriers.

show abstract

Photochemically triggered self-extraction of uranium from aqueous solution under ambient conditions

Cited by 49 publications

References 75 publications

Molten Salt Synthesis of Carbon Nitride Nanostructures at Different Temperatures for Extracting Uranium from Seawater

Molten Salt Synthesis of Carbon Nitride Nanostructures at Different Temperatures for Extracting Uranium from Seawater

Recent advances and perspectives of emerging two-dimensional transition metal carbide/nitride-based materials for organic pollutant photocatalysis

Dual Charge-Transfer Channels Harmonize Carrier Separation for Efficient U(VI) Photoreduction

Contact Info

Product

Resources

About