Visible light-activated NGQD/nsC3N4/Bi2WO6 microsphere composite for effluent organic matter treatment

In situ construction of a C3N5 nanosheet/Bi2WO6 nanodot S-scheme heterojunction with enhanced structural defects for the efficient photocatalytic removal of tetracycline and Cr(vi)

“…The activity even deteriorates (85.9%) with excess catalyst (40 mg), probably caused by the shielding effect and/or agglomeration of the catalyst. 32,50 As a consequence, the 10CN/BWO dosage in the photocatalytic tests is set as 20 mg. Fig. 6d illustrates the influence of initial pH on TC degradation.…”

“…, ions and dissolved organics) in tap water and river water (Table S1†) probably exert an inhibitory effect on the removal of TC by consuming parts of the active species and/or taking up the reactive sites on the photocatalyst. 32,51,53…”

“…Bi 2 WO 6 as an efficient VLD photocatalyst possesses the merits of high stability, environmental friendliness, peculiar physicochemical properties, and sufficiently positive valence band (VB) potential, manifesting a high oxidation capacity of photo-excited holes for the generation of hydroxyl radicals. 32–34 More significantly, the band structure of Bi 2 WO 6 matches perfectly with that of C 3 N 5 , making it perfect for the construction of the C 3 N 5 /Bi 2 WO 6 S-scheme heterojunction.…”

“…4b), the two peaks centered at 159.20 and 164.50 eV correspond to the Bi 4f 7/2 and Bi 4f 5/2 of Bi 3+ . 32,[40][41][42] As for W 4f, the peaks situated at 35.40 and 37.55 eV correspond to the W 4f 7/2 and W 4f 5/2 of W 6+ (Fig. 4c).…”

“…The decline of the activity is ascribed to the fact that substances (e.g., ions and dissolved organics) in tap water and river water (Table S1 †) probably exert an inhibitory effect on the removal of TC by consuming parts of the active species and/or taking up the reactive sites on the photocatalyst. 32,51,53 To explore the mineralization performance of 10CN/BWO, TOC experiments were performed (Fig. 6h).…”