Novel (Na, O) co-doped g-C 3 N 4 with simultaneously enhanced absorption and narrowed bandgap for highly efficient hydrogen evolution

In situ structural modification of graphitic carbon nitride by alkali halides and influence on photocatalytic activity

“…Alkali metal halides have been used previous to enhance the photocatalytic activity of g-C 3 N 4 . [30][31][32][33][34] For example, Hu et al prepared K-doped g-C 3 N 4 by using dicyanadiamide and potassium hydrate as precursors, and such obtained photocatalysts have tunable band edge positions and enhanced mineralization ability. 31 Zhang et al studied K-doped g-C 3 N 4 synthesized by thermal polymerization of dicyanadiamide and KI, and found that the photocatalytic efficiency for phenol and MB degradation was about 3.3 and 5.8 times that of bulk g-C 3 N 4 , respectively.…”

Synthesis of oxygen-doped graphitic carbon nitride and its application for the degradation of organic pollutants via dark Fenton-like reactions

“…On the one hand, these results indicated that the degree of crystallinity of g-C 3 N 4 (HY) slightly increased aer the hydrothermal treatment, which was consistent with the literature. 22 This was most probably due to the at layered structure being exposed and/or surface impurities being removed from the catalyst surface during the hydrothermal treatment. Wang et al 23 considered repairing the defects of bulk g-C 3 N 4 via the self-assembly of the internal hydrogen bonds of cyano and amino groups.…”

“…This implied that the interactions between the g-C 3 N 4 nanosheets decreased to some degree, which was due to the partial substitution of N atoms by O atoms. Fang et al 22 suggested that the appearance of this phenomenon could be mainly attributed to an increase in the crystallinity of g-C 3 N 4 and O-doping effects from the hydrothermal treatment. The absorption bands at 3500-2900 cm À1 , corresponding to -NH and -OH groups, were almost the same in all three catalysts, which originated from the catalyst and/or physically adsorbed water, respectively.…”

“…S9 †). It has been reported that the zero potential point (pK a ) of g-C 3 N 4 obtained from urea was about 3, 22 which meant that the surfaces of g-C 3 N 4 -based materials became negatively charged if the pH solution was above pK a , and similarly, their surface was protonated at pH solution < pK a . Accordingly, RhB developed a pseudo-positive charge at low pH solution , thus leading to a surface repulsion effect with the catalyst.…”

One-pot construction of Cu and O co-doped porous g-C3N4 with enhanced photocatalytic performance towards the degradation of levofloxacin

“…17,20,21 Recently, it was more exciting that dual doping of g-C 3 N 4 by co-doping nonmetal or metal ions could combine the advantages of these single dopants, leading to enhanced photocatalytic activity, 22 and some co-doped g-C 3 N 4 based nanomaterials, including I and K, O and Na, P and Mo, Fe and P have been demonstrated to exhibit higher photocatalytic activity than that of single element doping. [23][24][25][26] Herein, we constructed Cu and O co-doped porous g-C 3 N 4 with superior photocatalytic performance via a facile one-pot thermal polymerization method. The photocatalytic degradation of LEVO was carried out to evaluate their photocatalytic activities under visible light irradiation.…”