Enhanced visible-light activation of persulfate by g-C3N4 decorated graphene aerogel for methyl orange degradation

Photocatalytic degradation of tetracycline hydrochloride by lanthanum doped TiO2@g-C3N4 activated persulfate under visible light irradiation

“…TBA, EtOH, BQ, K 2 Cr 2 O 7 and EDTA were employed to quench ˙OH, SO 4 ˙ − and ˙OH, superoxide radical (˙O 2 − ), e − and h + , respectively. 11,43,47,48 As shown in Fig. 9, after the addition of BQ, the kinetic constant of the degradation TCH decreased significantly from 0.084 min −1 to 0.050 min −1 , which indicated that ˙O 2 − had a major contribution to the TCH degradation.…”

“…36 The peak at 1633 cm −1 is typically related to the stretching of CN when the characteristic absorption peaks at 1241 cm −1 , 1330 cm −1 , 1410 cm −1 , and 1640 cm −1 were assigned to the stretching vibration of the C–N heterocycles. 11,36 And the strong vibration peak at 808 cm −1 was observed s -triazine ring structure in g-C 3 N 4 . 36,37 The distinct stretching vibrations at 400–700 cm −1 was ascribed to the fingerprint region of TiO 2 and represented the presence of Ti–O and Ti–O–Ti bonds.…”

“…4b at 284.7 eV and 288.4 eV are correspond to the sp 2 carbon (CC) and the sp 3 CN bonds of the synthesized g-C 3 N 4 , respectively. 11,38 The N 1s spectrum in Fig. 4c could be divided into two main characteristic peaks at 398.4 eV and 400.7 eV, which corresponded to CN–C bonds and C–N–H bonds.…”

“…It was reported that SO 4 ˙ − and ˙OH were observed in the PDS activation system, while the ˙OH was observed in the photocatalytic system. 11,43,44…”

“…Compared to conventional water treatment methods, photocatalysis and sulfate radical-based advanced oxidation process (SR-AOP) have been demonstrated to be viable, eco-friendly and ideal technology for the degradation of refractory organic pollutants in aquatic environments. [9][10][11] Moreover, photocatalysis and SR-AOP demonstrated the positive synergetic interaction because persulfate (PS) could accept photogenerated electrons (e − ) to produce reactive oxygen species, which decreased the recombination of the photogenerated e − -hole (h + ) pairs. 12 Therefore, the development of the cost-effective photocatalyst during photocatalytic oxidation process is crucial.…”