Efficient photocatalytic removal of U(VI) over π-electron-incorporated g-C3N4 under visible light irradiation

Synthesis of crystalline carbon nitride with molten salt thermal treatment for efficient photocatalytic reduction and removal of U(VI)

“…As shown in Fig. 3c, CN had three peaks at 398.5, 400.1 and 401.2 eV, corresponding to C-N=C, N-(C) 3 and C-NH x , respectively [23,37]. All the binding energy N 1s spectra of CCN-500 shifted toward the higher binding energy side, suggesting that CCN-500 was more prone to lose electrons and was conducive to the photocatalytic reduction of uranium.…”

“…The band edges of CCN-X samples exhibited a slight red shift and showed a strong absorption intensity relative to the CN samples under the full spectrum. This may be caused by the reduced π-π interlayer stacking distance in the CCN-500 frameworks due to the increase crystallization of the CCN-500 samples [23]. In addition, the increased adsorption intensity of CCN-X samples can be attributed to the multiple re ections of incident light in the porous nanocrystal and the existence of nitrogen defects, suggesting the CCN-X samples have strong light energy utilization under visible light , generating more electron-hole pairs.…”

“…However, most photocatalysts contain metal components and the scarcity and metal toxicity of these photocatalysts restrict their large-scale applications in practical applications [14][15][16][17][18][19][20]. As a metal-free photocatalyst, graphitic carbon nitrides (g-C 3 N 4 ) are the most promising candidates in the eld of photocatalysis [21][22][23][24]. This is due to its attractive merits, such as good electronic structure, unique optical properties, chemical stability and environmentally friendliness.…”

Facile synthesis of nitrogen-defective g-C3N4 for superior photocatalytic degradation of rhodamine B

“…17 However, bulk g-C 3 N 4 has low photocatalytic efficiency as its low specic surface area, limited light absorption, and easy recombination of photo-generated carriers. 16,18 Following research found that the photocatalytic activity can be improved through modifying g-C 3 N 4 's morphology, [19][20][21] element doping, [22][23][24] and semiconductor compounding, [25][26][27] advancing the applications of g-C 3 N 4 in photocatalysis. 28,29 In these modication methods, the morphology control is a simple and effective way to adjust the surface structure to improve photocatalytic activity without introducing additional unit components during the synthesis process of the modied g-C 3 N 4 .…”